EP0095055A2 - Method of manufacturing an abrasive body - Google Patents

Method of manufacturing an abrasive body Download PDF

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Publication number
EP0095055A2
EP0095055A2 EP83104209A EP83104209A EP0095055A2 EP 0095055 A2 EP0095055 A2 EP 0095055A2 EP 83104209 A EP83104209 A EP 83104209A EP 83104209 A EP83104209 A EP 83104209A EP 0095055 A2 EP0095055 A2 EP 0095055A2
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EP
European Patent Office
Prior art keywords
layer
grinding
abrasive
binder
elastomer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83104209A
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German (de)
French (fr)
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EP0095055A3 (en
EP0095055B1 (en
Inventor
Rainer Augustin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DR. ELBEL SCHLEIFMITTEL GMBH
Original Assignee
Dr Elbel Schleifmittel GmbH
Sea Schleifmittel Entwicklung Anwendung GmbH
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Application filed by Dr Elbel Schleifmittel GmbH, Sea Schleifmittel Entwicklung Anwendung GmbH filed Critical Dr Elbel Schleifmittel GmbH
Priority to AT83104209T priority Critical patent/ATE33106T1/en
Publication of EP0095055A2 publication Critical patent/EP0095055A2/en
Publication of EP0095055A3 publication Critical patent/EP0095055A3/en
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Publication of EP0095055B1 publication Critical patent/EP0095055B1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24DTOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24DTOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/02Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery

Definitions

  • the invention relates to an elastic abrasive body for shape-following grinding, in which the active grinding surface is covered with abrasive grains and a partial volume consists of elastic material, and a method for producing such an abrasive body.
  • a grinding wheel according to the type mentioned has grinding grains statistically distributed in an elastomeric and mostly foamed binder.
  • the individual abrasive grain due to its elastic, resilient surface, evades the grinding pressure exerted by the machined workpiece due to rotating and tilting movements, no tangible cutting performance can be achieved with such abrasive bodies, which is why they are mainly used for finishing work for which they are excellently suited.
  • grinding belts are mainly used, the required elasticity being achieved instead of the elastic material as part of the grinding wheel by a more or less resilient contact roller over which the grinding belt is guided.
  • these grinding belts still have the deficiency that the cutting performance decreases with increasing service life and that the roughness depth also drops sharply. For this reason, sanding belts cannot be used at all in some areas.
  • the object of the invention is therefore to provide an elastic abrasive for all industrial applications, which has a more favorable ratio between service life (service life) and manufacturing costs (production costs) than the previously known solutions.
  • the invention solves this in that the grinding-active surface is formed from a layer of a hardened binder-abrasive grain mixture, which is connected to a foamed elastomer forming a backing layer.
  • the abrasive body according to the invention combines a uniformly high cutting performance during this period of use and also a uniform roughness depth. It is further characterized by the fact that it remains unaffected by the various coolants even when grinding, is completely independent of climate fluctuations and can be produced inexpensively and with constant quality.
  • a method according to the invention for producing such an elastic abrasive article consists in accelerating the binder-abrasive grain mixture and the elastomer forming the later backing layer in a molded part which specifies the later form of the abrasive article under the action of a force, in particular that those used for producing the abrasive article Mixtures are applied in succession under the action of force on the molded part.
  • the invention proposes the centrifugal force in a rotating system in which the molded part with the binder-abrasive grain mixture is located or under whose influence the two mixtures are applied to the molded part.
  • elastic grinding bodies can be produced in the practically required geometric shapes, for example in the form of disks (disk grinding disks) or wheel shape.
  • Advantageous refinements of the grinding wheel according to the invention and its production method can be found in the subclaims.
  • 1 and 2 in section representations consists of a layer 11 of a hardened binder-abrasive grain mixture, a carrier layer 12 formed of a foamed elastomer and a further layer 13 made of fabric, in particular textile fiber fabric.
  • the layer 11 of the binder-abrasive grain mixture has recesses 11a in such a way that the layer 11 is in shape. Islands 11b sits on the elastomer carrier layer 12.
  • All known hard materials such as corundum, silicon carbide, boron carbide and other carbides, garnet, natural sandpaper, glass powder, etc., can be used as the grinding grit for the layer 11 support and to achieve a sufficient chip gap volume in the active grinding surface, it is also recommended to install grinding aids such as pyrite, hollow corundum, marble powder, cryolite, etc., the density of which should be at least 2g / cm3.
  • Cold-curing types e.g. Polyurethanes curing at room temperature.
  • High-quality elastomers that cure warm can also be used for difficult grinding tasks.
  • thermosetting polyurethanes, thiocols and other liquid prepolymers of elastomers can be used.
  • the thickness of the binder abrasive grain layer 11 depends on the surface of the abrasive grain islands 11b and is 10-50% of the maximum extension (edge length, diameter) of the abrasive grain islands 11b.
  • the thickness of the elastomer carrier layer 12 is at least 5 mm, for most applications 10-20 mm are provided.
  • the width and number of the recesses 11a are selected such that the area ratio of grain islands 11b to recesses 11a is in the range from 50:50 to 95: 5.
  • soft, foaming polyurethane types or foaming thiocols can be used for the carrier layer 12.
  • binder formulations namely a harder, non-foaming formulation for the abrasive grain layer 11 and a softer adjusted and / or foaming formulation for the elastomer layer 12.
  • the difference in hardness between grain layer 11 and elastomer layer 12 results solely from the grain content. Even when using the same formulation for the binder of the grain layer 11 and the elastomer layer 12, the difference in hardness is therefore 10-20 Shore A points.
  • the differences in hardness between the grain layer 11 and the elastomer carrier layer 12 should not differ too much.
  • Shore-A-30 of the elastomer layer 12 the grain layer 11 should be set to Shore -A- 80 to 85; with a Shore-A 60 hardness of the elastomer layer 12, the hardness of the grain layer 11 can be Shore-D-8o.
  • an elastic abrasive body can be produced which is used in all industrial areas of application with regard to stability and dimensional sequence properties on the workpieces to be processed can.
  • the invention proposes a device as shown in FIGS. 7 and 8:
  • This device consists of a centrifuge in which a molded part 23 rotates within a protective hood 25 with a cover 22 to accommodate the mixture components of the grinding wheel.
  • the inside volume of the grinding wheel volume is limited by an inner ring 24.
  • the molded part 23 has corresponding ribs or projections which are complementary to the desired surface structure of the grinding body, for example to the geometric configurations of the cominels 11b and the recesses 11a shown in FIGS. 3 to 6.
  • This first method in its simplest form, consists first of all in that the entire mixture used to produce the two layers 11 and 12 is applied to the molded part 23 and then the centrifuge is set in rotation.
  • the grinding aids which are specifically heavier in relation to the elastomeric binder, if necessary grinding aids, are concentrated in the grinding-active surface, whereas the grinding-free and specifically lighter, optionally foaming elastomer builds up against the direction of the centrifugal force, as a result of which the two layers 11 and 12 with a smooth transition form.
  • the size of the centrifugal force and thus the rotational speed of the centrifuge depends on the viscosity and the open time as well as the foaming pressure of the elastomer used.
  • accelerations of the order of 3 - 6800 g, essentially in the range of 15 0 - 2500 g, are required to produce the grinding wheel according to the invention.
  • the production takes place in two shots, for which purpose an axially displaceable filler neck 21, with which a metered amount of an abrasive grain binder is initially inserted, is formed in the cavity provided between the molded part 23 and the inner ring 24 to form the grinding body -
  • the mixture is metered in, leveled when the mold is upright and the necessary amount of the grain-free elastomer (later backing layer) is injected immediately, advantageously by an automatic metering machine with a mixing head.
  • the binder containing the abrasive grain can have the same composition as the grain-free mixture used to produce the backing layer, but the former without, the latter with foaming agent.
  • the binder containing the abrasive grain for producing the layer 11
  • the binder containing the abrasive grain for producing the layer 11
  • the binder containing the abrasive grain for producing the layer 11
  • the grain-free elastomer mixture is applied to the not yet hardened grain binder mixture. This not only simplifies the manufacture of the abrasive articles according to the invention, it also achieves a smooth and stress-free hardness transition from the layer 11 containing the abrasive grain to the grain-free and softer elastomer layer 12, which is also supported by the centrifugal force gradient decreasing towards the center of rotation of the centrifuge.
  • the mixtures introduced in this way need not be cured to their full extent or at all under the action of the acceleration until they are demoldable.
  • the acceleration can be reduced after a certain time from, for example, 153-2446 g to 2.7- 153 g, in which the spin is continued until the mixture is still sticky but sufficiently firm. Then the mold can be removed and the abrasive body in the molded part, if necessary further hardened under the influence of heat.
  • the method according to the invention opens up the possibility of designing the inner ring 24 as a reusable core made of any hard material, the peripheral surface of which is freshly ground and optionally roughened and / or provided with an adhesion-promoting primer.
  • the shaped ring 24 designed in this way is then provided with a roll of open-meshed and optionally provided with adhesion promoter glass fiber fabric 13 before the molded part is filled, so that this fabric roll, which can also be low-stretch fabric, fleece, etc. made of other textile fibers, is an integral part Part of the grinding wheel produced.
  • the excess foam of the elastomer protrudes as a bead over the mold edge and can be easily cut off with a knife before the mass is removed from the mold and finally hardened .
  • the grinding wheel according to the invention and a method for its production have been described above using the example of a wheel-shaped grinding wheel, but grinding wheels in other shapes can also be produced, for example in the form of disks or plates.
  • the required shapes are rotatably suspended in the centrifuge, whereby the centrifugal force then also acts in the axial direction of the grinding wheel.
  • the foaming of the grain-free elastomer towards the pivot point can also be limited, but for the simplicity of the device it can also be freely foamed.
  • the grinding wheel must then be ground flat. Double-sided adhesive film can then be used to fasten the grinding plates thus obtained to a base.
  • the mixtures used do not need to be cured until they can be removed from the mold or under full acceleration, depending on the size of the grinding wheel, acceleration value, viscosity, open time and other parameters, a 3o - 180 second spin time is sufficient until the distribution is complete has stabilized in the pane structure so that the shape can be removed. It must be set down horizontally until the binder has sufficiently hardened, with a heat treatment for the final hardening being carried out simultaneously or subsequently.
  • This second method for producing the grinding bodies according to the invention is based on a flat shape which corresponds to the development of the finished grinding wheel: the width of the shape corresponds to the width of the grinding wheel to be produced, the length of its circumference.
  • this negative form consists of an elastomeric impression material, for example of silicone rubber.
  • abrasive articles according to the invention in the form of the islands 11b, corresponding mold cavities of this form are filled with a highly viscous and / or thixotropic abrasive bead binder mixture and wiped off. Then the mold is rolled into a circle and placed in the centrifuge mold. Then, with rotation, as described, an elastomer is used for back casting or back-foaming and curing.
  • a variant of this method is based on a rigid negative form.
  • a metal is conceivable as the molding material, but it is expedient to use a material which allows such molds to be produced more cheaply. Plaster, concrete, epoxy, polyester resin, deep-drawn foils or the like can be used.
  • the mold cavities provided with a release agent are in turn filled with the abrasive grain binder mixture until this mass is flush with the mold surface.
  • a carrier material of the appropriate dimensions is placed on top. Possible carrier materials are, for example, paper, foils, nonwovens, woven fabrics, knitted fabrics or the like.
  • the backing material must bond firmly to the Schleifkom binder mixture in the mold nests.
  • the backing material can be coated accordingly, provided that the self-adhesive strength of the Schleifkom binder mixture in the mold cavities is not sufficient for this.
  • the carrier material with the firmly adhering grinding knobs is pulled off the mold and then, with knobs facing outwards, inserted into the ring mold and, as already described , back-poured or back-foamed.
  • binders can now also be used for the grinding layer and the elastomer layer which cannot be combined by the former method.

Abstract

An elastic grinding element for form-true grinding including a supporting layer of elastomer material and an adhesive grit layer bound to the supporting layer and having an active grinding surface made of a hardened mixture of binder and abrasive grit. The process for making the grinding element includes providing a mold having a shape constructed to produce a desired shape for the grinding element, putting the mixture of binder and abrasive grit and the elastomer material in the mold, and accelerating the mixture of binder and abrasive grit and the elastomer material while in the mold.

Description

Die Erfindung betrifft einen elastischen Schleifkörper zum formfolgenden Schleifen, bei dem die schleifaktive Oberfläche mit Schleifkörnern besetzt ist und ein Teilvolumen aus elastischem Material besteht, sowie ein Verfahren zur Herstellung eines derartigen Schleifkörpers.The invention relates to an elastic abrasive body for shape-following grinding, in which the active grinding surface is covered with abrasive grains and a partial volume consists of elastic material, and a method for producing such an abrasive body.

Ein Schleifkörper gemäß der genannten Gattung weist statistisch in einem elastomeren und meist geschäumten Bindemittel verteilte Schleifkömer auf. Da das einzelne Schleifkorn infolge seines elastisch nachgebenden Untergrundes durch Dreh- und Kippbewegungen dem vom bearbeiteten Werkstück ausgeübten Schleifdruck aber ausweicht, lassen sich mit derartigen Schleifkörpern keine fühlbaren Zerspanleistungen erreichen, sie werden deswegen hauptsächlich für die Finishbearbeitung eingesetzt, für die sie sich vorzüglich eignen.A grinding wheel according to the type mentioned has grinding grains statistically distributed in an elastomeric and mostly foamed binder. However, since the individual abrasive grain, due to its elastic, resilient surface, evades the grinding pressure exerted by the machined workpiece due to rotating and tilting movements, no tangible cutting performance can be achieved with such abrasive bodies, which is why they are mainly used for finishing work for which they are excellently suited.

Eine Verbesserung dieser Schleifkörper ist dadurch erreicht worden, daß das Schleifkorn nicht mehr "individuell", sondern in hart gebundenen Verbänden, Konglomeraten von 3 - 5 mm Dicke, eingebettet ist. Diese Konglomerate "schwimmen" mit Abstand voneinander in dem elastischen Material. Infolge ihrer größeren Abmessungen und ihrer geometrischen Gestaltung wird das Ausweichen oder Wegkippen gegenüber dem vom Werkstück ausgeübten Schleifdruck verhindert. Derartige Schleifkörper haben schleiftechnisch erhebliche Vorteile, sind in der Herstellung jedoch sehr aufwendig und damit teuer und eignen sich auch nicht für das Schleifen mit ölhaltigen Kühlmitteln, da das Elastomer als verwendetes elastisches Material zwischen den Konglomeraten zu quellen beginnt. Auch mit reinem Wasser oder vollsynthetischen Kühlmitteln quellen diese Elastomere im Feinstkombereich wegen der hier sehr geringen Zerspanung und damit ger-ingen Abnutzung der Schleifkörper.An improvement of these abrasive bodies has been achieved in that the abrasive grain is no longer embedded "individually", but in hard-bonded dressings, conglomerates with a thickness of 3-5 mm. These conglomerates "float" in the elastic material at a distance from one another. Due to their larger dimensions and their geometrical design, the avoidance or tilting away from the grinding pressure exerted by the workpiece is prevented. Such grinding wheels have considerable advantages in terms of grinding technology, are, however, very complex to manufacture and therefore expensive and are also unsuitable for grinding with oil-containing coolants, since the elastomer, as the elastic material used, begins to swell between the conglomerates. Even with pure water or fully synthetic coolants, these elastomers swell in the finest grain area because of the very low machining and therefore low wear on the grinding wheels.

Außerhalb dieser gattungsgemäßen Schleifkörper werden hauptsächlich Schleifbänder eingesetzt, wobei anstelle des elastischen Materials als Bestandteil des Schleifkörpers die erforderliche Elastizität durch eine mehr oder weniger nachgiebige Kontaktrolle erreicht wird, über die das Schleifband gefuhrt ist. Diese Schleifbänder haben trotz wesentlicher Verbesserungen innerhalb der letzten Jahre noch immer den Mangel, daß die Zerspanleistung mit wachsender Gebrauchsdauer abnimmt und auch die hinterlassene Rauhtiefe stark sinkt. Aus diesem Grunde können Schleifbänder in manchen Bereichen überhaupt nicht eingesetzt werden.Outside of this generic grinding wheel, grinding belts are mainly used, the required elasticity being achieved instead of the elastic material as part of the grinding wheel by a more or less resilient contact roller over which the grinding belt is guided. Despite significant improvements in recent years, these grinding belts still have the deficiency that the cutting performance decreases with increasing service life and that the roughness depth also drops sharply. For this reason, sanding belts cannot be used at all in some areas.

Seit langem bekannt Schleiflamellenkörper besitzen zwar nicht diese spezifischen Nachteile von Schleifbändern, weisen jedoch wiederum eine erheblich niedrigere Zerspanleistung, verbunden mit erheblichen Gestehungs- und damit Schleifkosten auf.Grinding flap bodies which have been known for a long time do not have these specific disadvantages of grinding belts, but in turn have a considerably lower cutting performance combined with considerable production costs and thus grinding costs.

Schließlich werden heute noch mit einer Schleifkorn-Leim-Mischung belegte Lederlamellen- oder Filzkörper eingesetzt, die jedoch schwer herzustellen sind, klimaabhängig sind und weitere Nachteile aufweisen.Finally, leather slats or felt bodies covered with an abrasive grain / glue mixture are still used today, but they are difficult to manufacture, are climate-dependent and have further disadvantages.

Die Aufgabe der Erfindung besteht demnach darin, einen elastischen Schleifkörper für alle industriellen Anwendungsbereiche zu schaffen, der ein günstigeres Verhältnis zwischen Standzeit (Gebrauchsdauer) und Herstellungsaufwand ( Gestehungskosten) als die bisher bekannten Lösungen aufweist.The object of the invention is therefore to provide an elastic abrasive for all industrial applications, which has a more favorable ratio between service life (service life) and manufacturing costs (production costs) than the previously known solutions.

Dies löst die Erfindung dadurch, daß die schleifaktive Oberfläche aus einer Schicht eines gehärteten Bindemittel-Schleifkorn-Gemisches gebildet wird, die mit einem eine Trägerschicht bildenden, geschäumten Elastomer verbunden ist.The invention solves this in that the grinding-active surface is formed from a layer of a hardened binder-abrasive grain mixture, which is connected to a foamed elastomer forming a backing layer.

Der erfindungsgemäße Schleifkörper verbindet durch diesen Aufbau neben einer Standzeit, die etwa zwischen den Standzeiten eines Schleifbandes und der bekannten Konglomeratscheibe liegt, eine während dieser Gebrauchsdauer gleichmäßig hohe Zerspanleistung und ebenso gleichmäßige Rauhtiefe. Dabei zeichnet er sich weiter dadurch aus, daß er auch beim Schleifen mit den verschiedenen Kühlmitteln von diesen unbeeinflußt bleibt, völlig unabhängig von Klimaschwankungen ist und sich preiswert und mit gleichbleibender Qualität herstellen läßt.In addition to a service life that lies approximately between the service life of an abrasive belt and the known conglomerate disc, the abrasive body according to the invention combines a uniformly high cutting performance during this period of use and also a uniform roughness depth. It is further characterized by the fact that it remains unaffected by the various coolants even when grinding, is completely independent of climate fluctuations and can be produced inexpensively and with constant quality.

Ein erfindungsgemäßesVerfahren zur Herstellung eines derartigen elastischen Schleifkörpers besteht darin, daß das Bindemittel-Schleifkorn-Gemisch und das die spätere Trägerschicht bildende Elastomer in einem die spätere Form des Schleifkörpers vorgebenden Formteil unter Einwirkung einer Kraft beschleunigt werden, insbesondere, daß die zur Herstellung des Schleifkörpers verwendeten Gemische nacheinander unter Einwirkung der Kraft auf das Formteil aufgebracht werden.A method according to the invention for producing such an elastic abrasive article consists in accelerating the binder-abrasive grain mixture and the elastomer forming the later backing layer in a molded part which specifies the later form of the abrasive article under the action of a force, in particular that those used for producing the abrasive article Mixtures are applied in succession under the action of force on the molded part.

Zur Erzeugung der Beschleunigung schlägt die Erfindung dabei die Zentrifugalkraft in einem rotierenden System vor, in dem sich das Formteil mit der Bindemittel-Schleifkorn-Mischung befindet bzw. unter deren Einwirkung die beiden Gemische auf das Formteil aufgebracht werden.To generate the acceleration, the invention proposes the centrifugal force in a rotating system in which the molded part with the binder-abrasive grain mixture is located or under whose influence the two mixtures are applied to the molded part.

Mit diesem Verfahren lassen sich durch geeignete konstruktive Ausgestaltung der verwendeten Zentrifugen elastische Schleifkörper in den praktisch erforderlichen geometrischen Formen herstellen, beispielsweise in Scheibenform (Tellerschleifscheiben) oder auch Radform. Vorteilhafte Ausgestaltungen des erfindungsgemäßen Schleifkörpers und seines Herstellungsverfahrens sind den Unteransprüchen zu entnehmen.With this method, by means of a suitable structural design of the centrifuges used, elastic grinding bodies can be produced in the practically required geometric shapes, for example in the form of disks (disk grinding disks) or wheel shape. Advantageous refinements of the grinding wheel according to the invention and its production method can be found in the subclaims.

Ein Ausführungsbeispiel des erfindungsgemäßen Schleifkörpers und dessen Herstellungsverfahren werden nun anhand von Zeichnungen näher erläutert, es zeigen:

  • Figur 1: Einen Querschnitt durch den erfindungsgemäßen elastischen Schleifkörper in der Ebene A-B der Fig. 2,
  • Figur 2: einen Querschnitt durch die eine Hälfte des elastischen Schleifkörpers senkrecht zur Ebene A-B,
  • Figuren 3-6: einen Ausschnitt aus Oberflächenansichten des Schleifkörpers gemäß den Figuren 1 bis 2 mit verschiedenen Gestaltungen der schleifaktiven Oberfläche,
  • Figur 7: eine teilweise aufgebrochene Seitenansicht einer Zentrifuge zur Durchführung des erfindungsgemäßen Verfahrens zur Herstellung eines Schleifkörpers gemäß den Figuren 1 - 6 und
  • Figur 8: die Einzelheit X der Fig. 7 in einer Querschnittsdarstellung.
An embodiment of the grinding wheel according to the invention and its production method are now explained in more detail with reference to drawings, in which:
  • 1 shows a cross section through the elastic abrasive body according to the invention in the plane AB of FIG. 2,
  • FIG. 2 shows a cross section through one half of the elastic grinding body perpendicular to the plane AB,
  • FIGS. 3-6: a section of surface views of the grinding body according to FIGS. 1 to 2 with different designs of the grinding-active surface,
  • 7 shows a partially broken side view of a centrifuge for carrying out the method according to the invention for producing an abrasive wheel according to FIGS. 1-6 and
  • Figure 8: the detail X of FIG. 7 in a cross-sectional view.

Der in Fig. 1 und 2 in Schnittdarstellungen dargestellte Schleifkörper besteht aus einer Schicht 11 eines gehärteten Bindemittel-Schleifkorn-Gemisches, einer aus einem geschäumten Elastomer gebildeten Trägerschicht 12 und einer weiteren Schicht 13 aus Gewebe, insbesondere textilem Fasergewebe.1 and 2 in section representations consists of a layer 11 of a hardened binder-abrasive grain mixture, a carrier layer 12 formed of a foamed elastomer and a further layer 13 made of fabric, in particular textile fiber fabric.

Die Schicht 11 des Bindemittel-Schleifkorn-Gemisches weist dabei Aussparungen 11a derart auf, daß die Schicht 11 in Form vor. Inseln 11b auf der Elastomer-Trägerschicht 12 aufsitzt.The layer 11 of the binder-abrasive grain mixture has recesses 11a in such a way that the layer 11 is in shape. Islands 11b sits on the elastomer carrier layer 12.

Als Schleifkömung für die Schicht 11 können alle bekannten Hartstoffe verwendet werden, wie beispielsweise Korunde, Siliziumcarbid, Borcarbid und andere Carbide, Granat, Naturschmirgel, Glasmehl usw. Um die Schleifwirkung in verschiedener Hinsicht zu unterstützen und um ein ausreichendes Spanlückenvolumen in der schleifaktiven Oberfläche zu erzielen, empfiehlt sich außerdem der Einbau von Schleifhilfsmitteln wie beispielsweise Pyrit, Hohlkugelkorund, Marmormehl, Kryolith usw., deren Dichte mindestens 2g/cm3 betragen soll.All known hard materials, such as corundum, silicon carbide, boron carbide and other carbides, garnet, natural sandpaper, glass powder, etc., can be used as the grinding grit for the layer 11 support and to achieve a sufficient chip gap volume in the active grinding surface, it is also recommended to install grinding aids such as pyrite, hollow corundum, marble powder, cryolite, etc., the density of which should be at least 2g / cm3.

Als Bindemittel dienen vorzugsweise kalthärtende Typen z.B. bei Raumtemperatur härtende Polyurethane. Für schwierige Schleifaufgaben können auch höher-wertige Elastomere eingesetzt werden, die warm aushärten, hier sind beispielsweise warmhärtende Polyurethane, Thiokole und andere flüssige Präpolymere von Elastomeren verwendbar.Cold-curing types, e.g. Polyurethanes curing at room temperature. High-quality elastomers that cure warm can also be used for difficult grinding tasks. Here, for example, thermosetting polyurethanes, thiocols and other liquid prepolymers of elastomers can be used.

Die Dicke der Bindemittel-Schleifkorn-Schicht 11 richtet sich nach der Oberfläche der Schleifkorninseln 11b und beträgt 10 - 50% der maximalen Ausdehnung (Kantenlänge, Durchmesser) der Schleifkorninseln llb.The thickness of the binder abrasive grain layer 11 depends on the surface of the abrasive grain islands 11b and is 10-50% of the maximum extension (edge length, diameter) of the abrasive grain islands 11b.

Um dem erfindungsgemäßen Schleifkörper eine ausreichende Hintergrundelastizität zu geben, beträgt die Dicke der Elastomer-Trägerschicht 12 mindestens 5 mm, für die meisten Anwendungsfälle sind 10 - 20 mm vorgesehen.In order to give the abrasive body according to the invention sufficient background elasticity, the thickness of the elastomer carrier layer 12 is at least 5 mm, for most applications 10-20 mm are provided.

Breite und Anzahl der Aussparungen lla werden so gewählt, daß das Flächenverhältnis von Korninseln llb zu Aussparungen lla im Bereich 50 : 50 bis 95 : 5 liegt.The width and number of the recesses 11a are selected such that the area ratio of grain islands 11b to recesses 11a is in the range from 50:50 to 95: 5.

Für die Trägerschicht 12 lassen sich beispielsweise weiche, schäumende Polyurethan-Typen verwenden, oder auch schäumende Thiokole.For example, soft, foaming polyurethane types or foaming thiocols can be used for the carrier layer 12.

Um den Aufbau des Schleifkörpers auf den jeweiligen Verwendungszweck besser einstellen zu können, empfiehlt sich die Verwendung unterschiedlicher Bindemittelrezepturen, nämlich einer härteren,nicht schäumenden für die Schleifkornschicht 11 und einer weicher eingestellten und/oder schäurmendenRezeptur für die Elastomerschicht 12.In order to be able to better adjust the structure of the abrasive body to the respective intended use, it is recommended to use different binder formulations, namely a harder, non-foaming formulation for the abrasive grain layer 11 and a softer adjusted and / or foaming formulation for the elastomer layer 12.

Zweckmässigerweise geht man * von gleichen oder verwandten Rohstoffen aus, beispielsweise einer harten, nicht schäumenden und einer weicheren, schäumenden Polyurethan-Rezeptur. Entsprechendes gilt für Thiokole, die für ihre Verwendung in der Schleifkornschicht 11 ungeschäumt mit Epoxidharzen härter eingestellt werden.Expediently, * one starts from the same or related raw materials, for example a hard, non-foaming and a softer, foaming polyurethane formulation. The same applies to thiocols, which are made unfoamed with epoxy resins for their use in the abrasive grain layer 11.

Die Härtedifferenz zwischen Komschicht 11 und ElastomerSchicht 12 ergibt sich allein schon aus dem Korngehalt. Selbst bei Verwendung der gleichen Rezeptur für das Bindemittel der Kornschicht 11 und die Elastomerschicht 12 beträgt daher der Härteunterschied 10- 20 Shore- A- Punkte.The difference in hardness between grain layer 11 and elastomer layer 12 results solely from the grain content. Even when using the same formulation for the binder of the grain layer 11 and the elastomer layer 12, the difference in hardness is therefore 10-20 Shore A points.

Wenngleich durch die Verwendung des weiter unten erläuterten erfindungsgemässen Verfahrens zwischen den Schichten 11 und 12 ein fließender Übergang von Hart zu Weich erfolgt, und Schrumpfspannungen so vermieden werden, sollten die Härteunterschiede zwischen Kornschicht 11 und Elastomer-Trägerschicht 12 nicht zu stark differieren. Bei Shore- A- 30 der ElastomerSchicht 12 sollte die Kornschicht 11 auf Shore -A- 80 bis 85 eingestellt werden, bei einer Härte von Shore- A 60 der Elastomerschicht 12 kann die Härte der Kornschicht 11 bei Shore-D-8o liegen.Although a smooth transition from hard to soft takes place between the layers 11 and 12 by using the method according to the invention explained below, and shrinkage stresses are avoided in this way, the differences in hardness between the grain layer 11 and the elastomer carrier layer 12 should not differ too much. With Shore-A-30 of the elastomer layer 12, the grain layer 11 should be set to Shore -A- 80 to 85; with a Shore-A 60 hardness of the elastomer layer 12, the hardness of the grain layer 11 can be Shore-D-8o.

Durch Auswahl geeigneter Schleifkörnungen und Bindemittelrezepturen einerseits und durch Dimensionierung der relativen Größe der Schleifkorninseln 11b im Verhältnis zu den Aussparungen 11a in der Schleifschicht 11 andererseits lässt sich ein elastischer Schleifkörper herstellen, der hinsichtlich Standfestigkeit und Formfolgeeigenschaften auf die zu bearbeitenden Werkstücke in allen industriellen Anwendungsbereichen eingesetzt werden kann.By selecting suitable abrasive grains and binder formulations on the one hand and by dimensioning the relative size of the abrasive grain islands 11b in relation to the recesses 11a in the abrasive layer 11 on the other hand, an elastic abrasive body can be produced which is used in all industrial areas of application with regard to stability and dimensional sequence properties on the workpieces to be processed can.

beim unten erläuterten Zentrifugenverfahrenin the centrifuge process explained below

Im folgenden sollen nun erfindungsgemässe Verfahren zur Herstellung eines Schleifkörpers erläutert werden:Processes according to the invention for producing an abrasive wheel will now be explained below:

Zur Durchführung eines Verfahrens schlägt die Erfindung eine Vorrichtung vor, wie sie in den Fig. 7 und 8 dargestellt ist:To carry out a method, the invention proposes a device as shown in FIGS. 7 and 8:

Diese Vorrichtung besteht aus einer Zentrifuge, bei der innerhalb einer Schutzhaube 25 mit Deckel 22 ein Formteil 23 zur Aufnahme der Mischungsbestandteile des Schleifkörpers rotiert. Durch einen Innenring 24 wird das Schleifkörpervolumen nach innen hin begrenzt.This device consists of a centrifuge in which a molded part 23 rotates within a protective hood 25 with a cover 22 to accommodate the mixture components of the grinding wheel. The inside volume of the grinding wheel volume is limited by an inner ring 24.

Dabei weist das Formteil 23 entsprechende Rippen oder Vorsprünge auf, die komplementär zu der gewünschten Oberflächenstruktur des Schleifkörpers sind, beispielsweise zu den in den Fig. 3 bis 6 dargestellten geometrischen Ausgestaltungen der KominseIn 11b und der Aussparungen lla.Here, the molded part 23 has corresponding ribs or projections which are complementary to the desired surface structure of the grinding body, for example to the geometric configurations of the cominels 11b and the recesses 11a shown in FIGS. 3 to 6.

Dieses erste Verfahren besteht nun in seiner einfachsten Form zunächst darin, daß das gesamte zur Herstellung der beiden Schichten 11 und 12 verwendete Gemisch auf das Formteil 23 aufgebracht wird und dann die Zentrifuge in Rotation versetzt wird. Dadurch werden die im Verhältnis zum elastomeren Bindemittel spezifisch schwereren Schleifkörnergegebenenfalls Schleifhilfsmittel, in der schleifaktiven Oberfläche konzentriert, wogegen sich das schleifkomfreie und spezifisch leichtere, gegebenenfalls schäumende Elastomer sich gegen die Richtung der Zentrifugalkraft aufbaut, wodurch sich die beiden Schichten 11 und 12 mit einem fließenden Übergang bilden.This first method, in its simplest form, consists first of all in that the entire mixture used to produce the two layers 11 and 12 is applied to the molded part 23 and then the centrifuge is set in rotation. As a result, the grinding aids, which are specifically heavier in relation to the elastomeric binder, if necessary grinding aids, are concentrated in the grinding-active surface, whereas the grinding-free and specifically lighter, optionally foaming elastomer builds up against the direction of the centrifugal force, as a result of which the two layers 11 and 12 with a smooth transition form.

Die Größe der Zentrifugalkraft und damit der Rotationsgeschwindigkeit der Zentrifuge hängt dabei von der Viskosität und der offenen Zeit sowie dem Schäumdruck des verwendeten Elastomers ab. Je nach Art und Zusammensetzung des Gemischs sind zur Erzeugung des erfindungsgemässen Schleifkörpers Beschleunigungen in der Größenordnung von 3 - 6800g, im wesentlichen im Bereich von 150 - 2500g erforderlich.The size of the centrifugal force and thus the rotational speed of the centrifuge depends on the viscosity and the open time as well as the foaming pressure of the elastomer used. Depending on the type and composition of the mixture, accelerations of the order of 3 - 6800 g, essentially in the range of 15 0 - 2500 g, are required to produce the grinding wheel according to the invention.

Gemäss einer bevorzugten Variante des erfindungsgemässen Verfahrens erfolgt jedoch die Herstellung in 2 Schüssen, wozu in dem zur Bildung des Schleifkörpers vorgesehenen Hohlraum zwischen dem Formteil 23 und dem Innenring 24 ein axial verschiebbarer Füllstutzen 21 eingelassen ist , mit dem zunächst eine dosierte Menge eines Schleifkorn- Bindemittels-Gemisches dosiert eingegeben, bei stehender Form eingeebnet und sofort nachfolgend, vorteilhafterweise durch eine automatische Dosiermaschine mit Mischkopf, die notwendige Menge des kornfreien Elastomers ( spätere Trägerschicht) eingespritzt wird. Dabei kann das das Schleifkorn enthaltende Bindemittel prinzipiell die gleiche Zusammensetzung wie die zur Erzeugung der Trägerschicht verwendete kornfreie Mischung aufweisen, erstere jedoch ohne, letztere mit Schäumemittel. Auch kann zum Beispiel durch Vernetzer- Zugabe das Schleifkorn enthaltende Bindemittel ( zur Erzeugung der Schicht 11) härter eingestellt werden, um so die Spanleistung zu erhöhen.According to a preferred variant of the method according to the invention, however, the production takes place in two shots, for which purpose an axially displaceable filler neck 21, with which a metered amount of an abrasive grain binder is initially inserted, is formed in the cavity provided between the molded part 23 and the inner ring 24 to form the grinding body - The mixture is metered in, leveled when the mold is upright and the necessary amount of the grain-free elastomer (later backing layer) is injected immediately, advantageously by an automatic metering machine with a mixing head. In principle, the binder containing the abrasive grain can have the same composition as the grain-free mixture used to produce the backing layer, but the former without, the latter with foaming agent. Also, for example, by adding the crosslinker, the binder containing the abrasive grain (for producing the layer 11) can be made harder, in order to increase the chip removal rate.

Vorteilhafterweise wird dabei die kornfreie Elastomermischung auf die noch nicht ausgehärtete Kom-Bindemittelmischung aufgebracht. Dadurch ist nicht nur die Herstellung der erfindungsgemässen Schleifkörper vereinfacht, erreicht wird auch ein fließender und spannungsfreier Härteübergang von der Schleifkorn enthaltenden Schicht 11 zu der kornfreienund weicheren Elastomerschicht 12, der außerdem noch durch das zum Drehpunkt der Zentrifuge abnehmende Zentrifugalkraftgefälle unterstützt wird.Advantageously, the grain-free elastomer mixture is applied to the not yet hardened grain binder mixture. This not only simplifies the manufacture of the abrasive articles according to the invention, it also achieves a smooth and stress-free hardness transition from the layer 11 containing the abrasive grain to the grain-free and softer elastomer layer 12, which is also supported by the centrifugal force gradient decreasing towards the center of rotation of the centrifuge.

Die Aushärtung der derart eingebrachten Mischungen braucht nicht bis zur Entformbarkeit unter der Einwirkung der Beschleunigung in voller Höhe oder überhaupt zu erfolgen. Bei den im Ausfuhrungsbeispiel dargestellten Schleifkörperformen ( Rad) kann nach einer gewissen Zeit die Beschleunigung von beispielsweise 153 -2446g auf 2,7- 153g gesenkt werden, bei der dann solange weitergeschleudert wird, bis das Gemisch zwar noch klebrig, aber ausreichend fest ist. Dann kann die Form entnommen und der Schleifkörper im Formteil gegebenenfalls unter Wärmeeinfluß weiter zu Ende gehärtet werden.The mixtures introduced in this way need not be cured to their full extent or at all under the action of the acceleration until they are demoldable. In the case of the grinding wheel shapes (wheel) shown in the exemplary embodiment, the acceleration can be reduced after a certain time from, for example, 153-2446 g to 2.7- 153 g, in which the spin is continued until the mixture is still sticky but sufficiently firm. Then the mold can be removed and the abrasive body in the molded part, if necessary further hardened under the influence of heat.

Das erfindungsgemässe Verfahren eröffnet die Möglichkeit, den Innenring 24 als wiederverwendbaren Kern aus beliebigem hartem Material auszugestalten, dessen Umfangsfläche frisch geschliffen und gegebenenfalls gerauht und/oder mit einem haftungsvermittelnden Primer versehen ist.The method according to the invention opens up the possibility of designing the inner ring 24 as a reusable core made of any hard material, the peripheral surface of which is freshly ground and optionally roughened and / or provided with an adhesion-promoting primer.

Der derart ausgestaltete Formring 24 wird dann vor der Befüllung des Formteils mit einem Wickel offenmaschigen und gegebenenfalls mit Haftvermittler versehenen Glasseidengewebes 13 versehen, so daß dieser Gewebewickel, es kann sich hier auch um dehnungsarmes Gewebe, Vlies usw. aus anderen textilen Fasern handeln, ein integraler Bestandteil des hergestellten Schleifkörpers wird.The shaped ring 24 designed in this way is then provided with a roll of open-meshed and optionally provided with adhesion promoter glass fiber fabric 13 before the molded part is filled, so that this fabric roll, which can also be low-stretch fabric, fleece, etc. made of other textile fibers, is an integral part Part of the grinding wheel produced.

So besteht die Möglichkeit, derartige Schleifkörper in Radform auf beim Anwender vorhandenen geeigneten Vorrichtungen zu spannen, ohne daß sich beim Arbeiten der Schleifkörperring dehnt oder zerbirst.There is the possibility of clamping such grinding wheels in wheel form on suitable devices available to the user, without the grinding wheel ring stretching or bursting when working.

Bei der Herstellung von Schleifkörpern in Radform, wie in den Figuren dargestellt, steht bei der Herstellung der überschüssige Schaum des Elastomers als Wulst über den Formrand hervor und kann leicht mit einem Messer abgeschnitten werden, bevor die Masse aus der Form entnommen und zu Ende gehärtet wird.In the manufacture of wheel-shaped grinding wheels, as shown in the figures, the excess foam of the elastomer protrudes as a bead over the mold edge and can be easily cut off with a knife before the mass is removed from the mold and finally hardened .

Der erfindungsgemässe Schleifkörper und ein Verfahren zu seiner Herstellung sind oben am Ausführungsbeispiel eines Schleifkörpers in Radform beschrieben worden, es lassen sich jedoch auch Schleifkörper in anderen Formen herstellen, beispielsweise in Scheiben-oder Tellerform. Im letzteren Fall werden die erforderlichen Formen in der Zentrifuge drehbar aufgehängt, wodurch die Zentrifugalkraft dann ebenfalls in axialer Richtung des Schleifkörpers wirkt.The grinding wheel according to the invention and a method for its production have been described above using the example of a wheel-shaped grinding wheel, but grinding wheels in other shapes can also be produced, for example in the form of disks or plates. In the latter case, the required shapes are rotatably suspended in the centrifuge, whereby the centrifugal force then also acts in the axial direction of the grinding wheel.

Bei der Herstellung von Schleifkörpern in Tellerform lässt sich die Schäumung des kornfreien Elastomers zum Drehpunkt hin zwar auch begrenzen, der Einfachheit der Vorrichtung wegen kann man jedoch auch frei schäumen lassen. In diesem Falle muß anschließend der Schleifkörper plan geschliffen werden. Zur Befestigung der so erhaltenen Schleifteller auf einer Unterlage kann dann doppelseitige Klebefolie verwendet werden.In the manufacture of abrasive discs in the form of a plate, the foaming of the grain-free elastomer towards the pivot point can also be limited, but for the simplicity of the device it can also be freely foamed. In this case, the grinding wheel must then be ground flat. Double-sided adhesive film can then be used to fasten the grinding plates thus obtained to a base.

Bei der Herstellung von Tellerscheiben braucht ebenfalls die Aushärtung der verwendeten Gemische nicht bis zur Entformbarkeit oder unter Einwirkung der vollen Beschleunigung erfolgen, hier genügen, je nach Schleifkörpergröße, Beschleunigungswert, Viskosität, offener Zeit und weiterer Parameter 3o - 180 Sekunden Schleuderzeit, bis sich die Verteilung im Scheibenaufbau so stabilisiert hat, daß die Form entnommen werden kann. Sie muß bis zur ausreichenden Aushärtung der Bindemittel waagerecht abgesetzt werden, wobei gleichzeitig oder nachfolgend eine Wärmebehandlung zur abschließenden Aushärtung erfolgt.In the manufacture of disc discs, the mixtures used do not need to be cured until they can be removed from the mold or under full acceleration, depending on the size of the grinding wheel, acceleration value, viscosity, open time and other parameters, a 3o - 180 second spin time is sufficient until the distribution is complete has stabilized in the pane structure so that the shape can be removed. It must be set down horizontally until the binder has sufficiently hardened, with a heat treatment for the final hardening being carried out simultaneously or subsequently.

Es hat sich gezeigt, daß sich die oben beschriebenen Schleifkörper auch auf einem anderen Wege herstellen lassen. Dabei ergeben sich sowohl hinsichtlich der Fertigung (Produktionskosten) als auch in Bezug auf eine Erhöhung der Schleifleistung erhebliche Vorteile:It has been shown that the abrasive bodies described above can also be produced in another way. This results in considerable advantages both in terms of production (production costs) and in terms of an increase in grinding performance:

Dieses zweite Verfahren zur Herstellung der erfindungsgemäßen Schleifkörper geht von einer ebenen Form aus, die der Abwicklung des fertigen Schleifrades entspricht: Die Breite der Form entspricht dabei der Breite des herzustellenden Schleifrades, die Länge dessen Umfang.This second method for producing the grinding bodies according to the invention is based on a flat shape which corresponds to the development of the finished grinding wheel: the width of the shape corresponds to the width of the grinding wheel to be produced, the length of its circumference.

Im einfachsten Falle besteht diese Negativ-Form aus einem elastomeren Abformmaterial, beispielsweise aus Silikonkautschuk. Zur Herstellung der erfindungsgemäßen Schleifkörper in Form der Inseln llb werden entsprechende Formnester dieser Form mit einem hoch-viskosen und/oder thixotropen Schleifkarn-Bindemittelgemisch gefüllt und abgestrichen. Anschließend wird die Form zum Kreis gerollt und in die Schleuderform eingelegt. Unter Rotation wird anschließend, wie beschrieben, mit einem Elastomeren hintergossen bzw. hinterschäumt und ausgehärtet.In the simplest case, this negative form consists of an elastomeric impression material, for example of silicone rubber. To produce the abrasive articles according to the invention in the form of the islands 11b, corresponding mold cavities of this form are filled with a highly viscous and / or thixotropic abrasive bead binder mixture and wiped off. Then the mold is rolled into a circle and placed in the centrifuge mold. Then, with rotation, as described, an elastomer is used for back casting or back-foaming and curing.

Eine Variante dieses Verfahrens geht von einer starren Negativ-Form aus. Als Formmaterial ist ein Metall denkbar, zweckmäßigerweise verwendet man jedoch ein Material, welches solche Formen preiswerter herzustellen gestattet. Es kommen hierfür in Frage Gips, Beton, Epoxid-, Polyesterharz, tiefgezogene Folien o.a.A variant of this method is based on a rigid negative form. A metal is conceivable as the molding material, but it is expedient to use a material which allows such molds to be produced more cheaply. Plaster, concrete, epoxy, polyester resin, deep-drawn foils or the like can be used.

Zur Herstellung des erfindungsgemäßen Schleifkörpers in Radform werden die mit einem Trennmittel versehenen Formnester wiederum mit dem Schleifkorn-Bindemittelgemisch gefüllt, bis diese Masse bündig mit der Formoberfläche abschließt. Anschließend wird ein Trägermaterial entsprechender Abmessung aufgelegt. Als Trägermaterialien kommen in Frage z.B. Papier, Folien, Vliese, Gewebe, Gewirke o.ä.To produce the grinding wheel according to the invention in wheel form, the mold cavities provided with a release agent are in turn filled with the abrasive grain binder mixture until this mass is flush with the mold surface. Then a carrier material of the appropriate dimensions is placed on top. Possible carrier materials are, for example, paper, foils, nonwovens, woven fabrics, knitted fabrics or the like.

Das Trägermaterial muß sich fest mit dem Schleifkom-Bindemittelgemisch in den Formnestern verbinden. Zu diesem Zweck kann das Trägermaterial entsprechend beschichtet sein, sofern die Eigenklebkraft des Schleifkom-Bindemittelgemisches in den Formnestem hierfür nicht ausreicht.The backing material must bond firmly to the Schleifkom binder mixture in the mold nests. For this purpose, the backing material can be coated accordingly, provided that the self-adhesive strength of the Schleifkom binder mixture in the mold cavities is not sufficient for this.

Nach dem Aushärten des Schleifkorn-Bindemittelgemisches in den Formnestern, ggf. unter Einwirkung von Wärme, wird das Trägermaterial mit den fest anhaftenden Schleifnoppen (Inseln llb) von der Form abgezogen und anschließend, Noppen nach außen, in die Ringform eingelegt und, wie bereits beschrieben, hintergossen bzw. hinterschäumt.After the abrasive grain / binder mixture has hardened in the mold nests, possibly under the influence of heat, the carrier material with the firmly adhering grinding knobs (islands IIb) is pulled off the mold and then, with knobs facing outwards, inserted into the ring mold and, as already described , back-poured or back-foamed.

Selbstverständlich ist es auch möglich, zuvor die Schleifkorn-Bindemittelmasse auszuhärten und anschließend das Trägermaterial aufzubringen, welches in diesem Falle natürlich entsprechend mit einem dauerhaften Kleber versehen sein muß.Of course, it is also possible to cure the abrasive grain binder composition beforehand and then to apply the backing material, which in this case must of course be provided with a permanent adhesive.

Hinsichtlich der Produktionskosten ergeben sich bei diesem Verfahren folgende Vorteile:

  • 1. Die Trägerstreifen mit dem fest anhaftenden Schleifnoppen können auf Lager gefertigt und später entsprechend Kundenwunsch, mehr oder weniger hart bzw. elastisch hintergossen bzw. hinterschäumt werden.
  • 2. Eine ebene Form ist kostengünstiger herzustellen als eine entsprechende Ringform.
  • 3. Die notwendigen Zentrifugalbeschleunigungen sind geringer, wodurch die Zentrifugen leichter gebaut sein können. Schließlich ist es so sogar möglich, völlig ohne Zentrifugeneinsatz zu arbeiten.
With regard to production costs, this process has the following advantages:
  • 1. The carrier strips with the firmly adhering grinding knobs can be made in stock and later, according to customer requirements, more or less hard or elastically cast or back-foamed.
  • 2. A flat shape is cheaper to produce than a corresponding ring shape.
  • 3. The necessary centrifugal accelerations are lower, which means that the centrifuges can be made lighter. After all, it is even possible to work without using a centrifuge.

Die Vorteile in bezug auf die Erhöhung der Schleifleistung ergeben sich aus der Tatsache, daß nunmehr auch solche Bindemittel für die Schleifschicht und die Elastomerschicht verwendet werden können, die sich nach dem ersteren Verfahren nicht kombinieren lassen. So wird es möglich, als Bindemittel für die Schleifschicht beispielsweise Phenolharze zu verwenden, Bindemittel also, die für ihre hohen Abtragsleistungen pro Zeiteinheit bekannt sind.The advantages in terms of increasing the grinding performance result from the fact that binders can now also be used for the grinding layer and the elastomer layer which cannot be combined by the former method. This makes it possible, for example, to use phenolic resins as binders for the abrasive layer, ie binders which are known for their high removal rates per unit of time.

Claims (10)

1. Elastischer Schleifkörper zum formfolgenden Schleifen, der aus einer schleifaktiven und einer schleifkornfreien, elastomeren Schicht besteht, dadurch gekennzeichnet, daß die schleifaktive Schicht (11) aus Schleifkom-Bindemittelgemisch Aussparungen (11a) der Art aufweist, daß die Schicht (11) in Form von Inseln (llb) auf der Elastomer-Trägerschicht (12) aufliegt und die Elastomer-Trägerschicht (12) eine Dicke von mind. 5 mm, insbesondere 10-20 mm hat.1. Elastic grinding body for shape-following grinding, which consists of an active grinding and an abrasive grain-free, elastomeric layer, characterized in that the active grinding layer (11) made of Schleifkom-binder mixture has recesses (11a) of the type that the layer (11) in shape of islands (11b) rests on the elastomer carrier layer (12) and the elastomer carrier layer (12) has a thickness of at least 5 mm, in particular 10-20 mm. 2. Schleifkörper nach Anspruch 1, dadurch gekennzeichnet, daß das Verhältnis der Oberfläche der Inseln (11b) zur Bodenfläche der Aussparungen (11a) im Bereich 1:1 bis 20:1 liegt und daß die Dicke der Inseln (11b) das 0,1 - 0,5 -fache ihrer max. Ausdehnung (Kantenlänge, Durchmesser) beträgt.2. Abrasive body according to claim 1, characterized in that the ratio of the surface of the islands (11b) to the bottom surface of the recesses (11a) is in the range 1: 1 to 20: 1 and that the thickness of the islands (11b) is 0.1 - 0.5 times their max. Expansion (edge length, diameter). 3. Schleifkörper nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der aus Schleifkorn und einem synthetischen Bindemittel bestehenden Schicht (11) Schleifhilfsmittel und/oder Porenbildner zugesetzt werden.3. Abrasive body according to claim 1 and 2, characterized in that the layer consisting of abrasive grain and a synthetic binder (11) grinding aids and / or pore formers are added. 4. Schleifkörper nach Anspruch 1, dadurch gekennzeichnet, daß die Elastomer-Trägerschicht (12) auf eine weitere Schicht (13) aus Gewebe, insbesondere textilem Fasergewebe, aufgebracht ist und diese Gewebeschicht (13) die Elastomer-Trägerschicht (12) zur Achse hin abschließt und/oder zwischen der schleifaktiven Schicht (11) und der Elastomer-Trägerschicht (12) liegt.4. Abrasive body according to claim 1, characterized in that the elastomer carrier layer (12) is applied to a further layer (13) made of fabric, in particular textile fiber fabric, and this fabric layer (13) the elastomer carrier layer (12) towards the axis seals and / or lies between the active grinding layer (11) and the elastomer carrier layer (12). 5. Verfahren zur Herstellung eines Schleifkörpers nach den Ansprüchen 1 bis 4 durch Einwirkung einer beschleunigenden Kraft, dadurch gekennzeichnet, daß die zur Erzeugung der Beschleunigung eingesetzte Kraft die Zentrifugalkraft in einem rotierenden System ist, in welchem sich das Formteil (23) befindet.5. A method for producing an abrasive body according to claims 1 to 4 by the action of an accelerating force, characterized in that the force used to generate the acceleration is the centrifugal force in a rotating system in which the molded part (23) is located. 6. Verfahren zur Herstellung eines Schleifkörpers nach Anspruch 5, dadurch gekennzeichnet, daß die Radialbeschleunigung im Bereich zwischen Füllstutzen (21) und Formteil (23) steuerbar ist zwischen 3g bis ca. 6800g.6. A method for producing an abrasive body according to claim 5, characterized in that the radial acceleration in the area between the filler neck (21) and the molded part (23) is controllable between 3g to about 6800g. 7. Verfahren nach Anspruch 5 und 6, dadurch gekennzeichnet, daß die zur Herstellung des Schleifkörpers verwendeten Gemische nacheinander in die Zentrifuge dosiert werden und die Zugabe des Elastomers erfolgt, wenn das vorher auf das Formteil (23) dosierte Schleifkorn-BindemittelGemisch noch nicht ausgehärtet ist. ;7. The method according to claim 5 and 6, characterized in that the mixtures used to produce the abrasive body are successively metered into the centrifuge and the addition of the elastomer takes place when the abrasive grain-binder mixture previously metered onto the molded part (23) has not yet cured . ; 8. Verfahren zur Herstellung eines Schleifkörpers nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß die Schicht (11) des Bindemittel-Schleifkorn-Gemisches als schleifaktive Oberfläche in einer ebenen Form vorgefertigt wird und in Ringform mit der elastomeren Trägerschicht (12) versehen wird.8. A method for producing an abrasive body according to claims 1 to 4, characterized in that the layer (11) of the binder-abrasive grain mixture is prefabricated as a grinding active surface in a flat shape and is provided in a ring shape with the elastomeric carrier layer (12) . 9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß die ebene Form elastisch ist und zusammen mit der schleifaktiven Schicht (11) in eine ringförmige Gestalt gebracht wird.9. The method according to claim 8, characterized in that the flat shape is elastic and is brought together with the grinding active layer (11) in an annular shape. 10. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß die ebene Form starr ist, daß die schleifaktive Schicht (11) mit einem Trägermaterial verbunden wird, aus der ebenen Form entnommen und in eine Ringform eingelegt wird.10. The method according to claim 8, characterized in that the flat shape is rigid, that the grinding active layer (11) is connected to a carrier material, removed from the flat shape and inserted into a ring shape.
EP83104209A 1982-05-25 1983-04-29 Method of manufacturing an abrasive body Expired EP0095055B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83104209T ATE33106T1 (en) 1982-05-25 1983-04-29 PROCESS FOR MAKING AN ABRASIVE WHEEL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823219567 DE3219567A1 (en) 1982-05-25 1982-05-25 ELASTIC GRINDING BODY AND METHOD FOR THE PRODUCTION THEREOF
DE3219567 1982-05-25

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EP0095055A2 true EP0095055A2 (en) 1983-11-30
EP0095055A3 EP0095055A3 (en) 1984-02-22
EP0095055B1 EP0095055B1 (en) 1988-03-23

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US (1) US4539017A (en)
EP (1) EP0095055B1 (en)
AT (1) ATE33106T1 (en)
DE (2) DE3219567A1 (en)

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EP0242410A1 (en) * 1986-04-17 1987-10-28 Carborundum Schleifmittelwerke GmbH Method of manufacturing an elastic grinding body
WO1995000294A1 (en) * 1993-06-17 1995-01-05 Minnesota Mining And Manufacturing Company Abrasive belts with an endless, flexible, seamless backing and methods of preparation
US5573619A (en) * 1991-12-20 1996-11-12 Minnesota Mining And Manufacturing Company Method of making a coated abrasive belt with an endless, seamless backing
US5578096A (en) * 1995-08-10 1996-11-26 Minnesota Mining And Manufacturing Company Method for making a spliceless coated abrasive belt and the product thereof
US5584897A (en) * 1994-02-22 1996-12-17 Minnesota Mining And Manufacturing Company Method for making an endless coated abrasive article
US5681612A (en) * 1993-06-17 1997-10-28 Minnesota Mining And Manufacturing Company Coated abrasives and methods of preparation
US6406577B1 (en) 1991-12-20 2002-06-18 3M Innovative Properties Company Method of making abrasive belt with an endless, seamless backing
US6406576B1 (en) 1991-12-20 2002-06-18 3M Innovative Properties Company Method of making coated abrasive belt with an endless, seamless backing
CN103506967A (en) * 2013-07-03 2014-01-15 陕西德赛新材料科技有限公司 Principle and technological process of producing efficient grinding materials through implantation method
CN104227575A (en) * 2014-09-15 2014-12-24 陕西德赛新材料科技有限公司 Grinding unit implantation-based flexible grinding tool preparation method
CN105729318A (en) * 2016-05-05 2016-07-06 珠海市巨海科技有限公司 Grinding wheel for polishing and grinding ceramic tile biscuit, manufacturing method of grinding wheel and polishing and grinding apparatus and polishing and grinding method for ceramic tile biscuit

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Cited By (16)

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Publication number Priority date Publication date Assignee Title
EP0242410A1 (en) * 1986-04-17 1987-10-28 Carborundum Schleifmittelwerke GmbH Method of manufacturing an elastic grinding body
US6066188A (en) * 1991-12-20 2000-05-23 Minnesota Mining And Manufacturing Company Coated abrasive belt with an endless seamless backing and method of preparation
US5573619A (en) * 1991-12-20 1996-11-12 Minnesota Mining And Manufacturing Company Method of making a coated abrasive belt with an endless, seamless backing
US6406576B1 (en) 1991-12-20 2002-06-18 3M Innovative Properties Company Method of making coated abrasive belt with an endless, seamless backing
US5609706A (en) * 1991-12-20 1997-03-11 Minnesota Mining And Manufacturing Company Method of preparation of a coated abrasive belt with an endless, seamless backing
US6406577B1 (en) 1991-12-20 2002-06-18 3M Innovative Properties Company Method of making abrasive belt with an endless, seamless backing
WO1995000294A1 (en) * 1993-06-17 1995-01-05 Minnesota Mining And Manufacturing Company Abrasive belts with an endless, flexible, seamless backing and methods of preparation
US5681612A (en) * 1993-06-17 1997-10-28 Minnesota Mining And Manufacturing Company Coated abrasives and methods of preparation
US5924917A (en) * 1993-06-17 1999-07-20 Minnesota Mining And Manufacturing Company Coated abrasives and methods of preparation
US5584897A (en) * 1994-02-22 1996-12-17 Minnesota Mining And Manufacturing Company Method for making an endless coated abrasive article
US5830248A (en) * 1995-08-10 1998-11-03 Minnesota Mining & Manufacturing Company Method for making a spliceless coated abrasive belt
US5578096A (en) * 1995-08-10 1996-11-26 Minnesota Mining And Manufacturing Company Method for making a spliceless coated abrasive belt and the product thereof
CN103506967A (en) * 2013-07-03 2014-01-15 陕西德赛新材料科技有限公司 Principle and technological process of producing efficient grinding materials through implantation method
CN104227575A (en) * 2014-09-15 2014-12-24 陕西德赛新材料科技有限公司 Grinding unit implantation-based flexible grinding tool preparation method
CN104227575B (en) * 2014-09-15 2016-07-06 陕西德赛新材料科技有限公司 A kind of flexible abrasive product preparation method implanted based on grinding unit
CN105729318A (en) * 2016-05-05 2016-07-06 珠海市巨海科技有限公司 Grinding wheel for polishing and grinding ceramic tile biscuit, manufacturing method of grinding wheel and polishing and grinding apparatus and polishing and grinding method for ceramic tile biscuit

Also Published As

Publication number Publication date
US4539017A (en) 1985-09-03
EP0095055A3 (en) 1984-02-22
EP0095055B1 (en) 1988-03-23
ATE33106T1 (en) 1988-04-15
DE3376055D1 (en) 1988-04-28
DE3219567A1 (en) 1983-12-01

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