EP0469410A1 - Method and device for strengthening of reinforcing bars for concrete - Google Patents

Method and device for strengthening of reinforcing bars for concrete Download PDF

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Publication number
EP0469410A1
EP0469410A1 EP91112149A EP91112149A EP0469410A1 EP 0469410 A1 EP0469410 A1 EP 0469410A1 EP 91112149 A EP91112149 A EP 91112149A EP 91112149 A EP91112149 A EP 91112149A EP 0469410 A1 EP0469410 A1 EP 0469410A1
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EP
European Patent Office
Prior art keywords
bending
reinforcing steel
subjected
roller
deformation
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EP91112149A
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German (de)
French (fr)
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EP0469410B1 (en
Inventor
Robert Thiesbürger
Wolfgang Preiss
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HANSE-MONTAN HANSEATISCHE MONTANHANDELSGESELLSCHAFT mbH
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HANSE-MONTAN HANSEATISCHE MONTANHANDELSGESELLSCHAFT mbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F9/00—Straining wire
    • B21F9/005—Straining wire to affect the material properties of the wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
    • B21D3/05—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers arranged on axes rectangular to the path of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F9/00—Straining wire
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
    • C21D7/105—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars of concrete reinforcing bars

Definitions

  • the invention relates to a method for strengthening reinforcing steel, in particular weldable reinforcing steel, which was produced by hot rolling, the reinforcing steel being continuously subjected to a mechanical deformation in a continuous cold process and thereby being adjusted, inter alia, with regard to its yield strength and its elongation.
  • reinforcing steel in the context of the invention denotes ribbed and non-ribbed reinforcing steel, in particular also reinforcing steel with inclined ribs and optionally longitudinal ribs, e.g. Reinforcing steel according to DIN 488.
  • the invention further relates to a system for performing the described method.
  • the mechanical deformation is cold stretching.
  • the stretching results from a torsional deformation with the aid of a torsional machine that works discontinuously.
  • the discontinuous procedure interferes with the operational process.
  • Relatively large, unavoidable tolerances must be permitted and taken into account for the yield strength to be set and for the stretching to be set.
  • the values for the yield strength and the stretching over the length of a reinforcing steel are not very uniform in accordance with the different stretching sections which belong to the discontinuous procedure.
  • the fatigue strength of the stretched reinforcing steel is often unsatisfactory. There is a risk of fatigue failure in the event of vibration stress.
  • the bending deformation on the stretching discs is sparse. It is set up in such a way that the frictional forces acting on the reinforcing steel are sufficient to take the reinforcing steel sufficiently slip-free and cause the stretching described in the area between the two stretching disks.
  • the bending deformation on the stretching discs does not have any effect which significantly contributes to the strengthening itself.
  • the drawing takes place in the longitudinal direction of the reinforcing steel.
  • the hardening generated is a uniaxial strain hardening with considerable anisotropy across the cross-section of the reinforcing steel.
  • the quality improvements that can be achieved through this strain hardening can be impaired by the Bauschinger effect, which is disruptive for certain applications of the manufactured and hardened reinforcing steel.
  • the Bauschinger effect describes a special physical phenomenon: According to Bauschinger's knowledge, the plastic deformation of a material in one direction lowers the elastic limit with subsequent deformation in the opposite direction. The Bauschinger effect is based on the formation of internal stresses that are effective against the original direction of deformation.
  • the invention has for its object to carry out the method described above so that a very isotropic strain hardening is achieved over the cross section of the reinforcing steel.
  • the invention is further based on the object of specifying a system which is particularly suitable for carrying out the method according to the invention.
  • the invention teaches from a process engineering point of view that the reinforcing steel in the torsion-free pass in several different bending planes, which are offset equidistantly from one another, is subjected to a multistage bending deformation around a bending roller and is thus superposed in the bending planes multi-axis strain-hardening, with an extension of the reinforcing steel is reached, and that the yield point and the elongation are set by the extent of the extension.
  • the reinforcing steel is preferably subjected to three-stage bending deformation in three different bending planes which are offset from one another by approximately 120 ° fen.
  • the reinforcing steel can be subjected to multi-stage bending deformation at a throughput speed of 1 to 25 m / sec. - Since, according to the invention, the reinforcing steel undergoes a bending in mutually offset bending planes, one can speak of a multi-axis bending condition or also of a multi-axis strain hardening condition when viewed around the reinforcing steel axis. In the continuous process, this means that every point on the reinforcing steel surface is subjected to this stress in a continuously changing manner. The result is a very even and very isotropic hardening and a very defined and even decrease in cross-section. Surprisingly, the annoying Bauschinger effect disappears.
  • the quality values of the reinforcing steel in terms of yield strength, tensile strength and elongation at break are significantly improved and can be adjusted or controlled via the extension, ie the degree of stretching.
  • the effects according to the invention are particularly pronounced when working with three bending planes as described.
  • a preferred embodiment of the invention is characterized in that the length of the reinforcing steel is at least 5%. It goes without saying that a sufficiently pronounced bending deformation must be realized within the scope of the invention. It has been proven that the reinforcing steel is guided on the individual bending rollers with a wrap angle of 100 to 150 °. It can be used with bending rollers that have a diameter in the diameter range that has been specified in claim 6.
  • the consolidation can be set up and controlled via the extension that the reinforcing steel undergoes in the method according to the invention.
  • the invention teaches in detail that the extension, which the reinforcing steel undergoes during the hardening, and thus the hardening, is set up, even at a predetermined throughput speed, by selecting the diameter of the bending rollers and / or varying the wrap angle. It is within the scope of the invention to set the diameter of the bending roller and / or the wrap angle differently in the individual bending deformation stages. In any case, the wrap angle can be adjusted operationally.
  • the method according to the invention is suitable for a wide variety of reinforcing steels customary in the construction industry.
  • the method has proven particularly useful when working with a reinforcing steel in the diameter range of 6 to 14 mm.
  • the object of the invention is in particular that a reinforcing steel according to DIN 488 is subjected to the method according to the invention.
  • the reinforcing steel can be straightened using conventional aids, or afterwards the usual cutting to the lengths that the reinforcing steel must have for use.
  • the invention also relates to a plant for carrying out an embodiment of the method described. It is basically characterized by three roller straighteners, each with a defined bending plane, which are arranged one behind the other in the direction of travel of the reinforcing steel, offset from each other by 120 °, each roller straightener having two support rollers and one bending roller arranged in the area between the support rollers. According to a preferred embodiment of the invention, the bending roller is adjustable relative to the support rollers and the wrap angle is thereby adjustable.
  • roller straighteners 1, 2, 3 can be seen, each with a defined bending plane A, B, C, which are arranged one behind the other in the direction of travel of the reinforcing steel 4. They are offset from one another by approximately 120 °, for which reference is made in particular to FIG. 2. 1 that each roller straightener 1, 2, 3 has two support rollers 5 and a bending roller 6 arranged in the area between the support rollers 5. This can be adjusted in the direction of the arrow, which has been arranged in the region of the center in FIG. 1.
  • the reinforcing steel 4 is subjected to a three-stage bending deformation by one bending roller 6 in each case in the torsion-free passage in three different bending planes A, B, C, which are offset from one another by approximately 120 °. As a result, it is strain-hardened in three axes A, B, C superposed on three axes.
  • An extension of the reinforcing steel 4 is achieved.
  • the yield strength and the elongation can be adjusted by the extent of the extension.
  • the bending rollers 6 can be specially selected with respect to the bending roller diameter d and the wrap angle a can be particularly adjusted. - Do the same, if with more working as three bending levels.
  • the bending-hardening process is followed by a continuously working straightening system, which straightens the solidified material and cuts it to bars of a defined length. Both systems are set up in a line and work synchronously.
  • the straightened material can be used as primary material for bending and reinforcement companies.

Abstract

Method for hardening reinforcing bars for concrete, in particular weldable reinforcing bars produced by hot rolling, the reinforcing bars being subjected to cold mechanical deformation in a continuous process and thereby adjusted, inter alia, in respect of their yield strength and breaking elongation. The reinforcing bars are subjected to multi-stage bending, without torsion, around a bending roller (5, 6) in various equidistant, mutually offset bending planes and thereby cold work/hardened in the bending planes along a plurality of superposed axes. In the process, a lengthening of the reinforcing rods is achieved. The yield strength and breaking elongation are adjusted by the extent of this lengthening. A device for carrying out the method is also disclosed. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Verfestigung von Betonstahl, insbesondere von schweißbarem Betonstahl, der durch Warmwalzen hergestellt wurde, wobei der Betonstahl kontinuierlich im Durchlaufverfahren kalt einer mechanischen Verformung unterworfen und dadurch unter anderem in bezug auf seine Streckgrenze und seine Dehnung eingestellt wird. Der Ausdruck Betonstahl bezeichnet im Rahmen der Erfindung gerippten und ungerippten Betonstahl, insbesondere auch Betonstahl mit Schrägrippen sowie gegebenenfalls Längsrippen, z.B. Betonstahl nach DIN 488. Die Erfindung betrifft fernerhin eine Anlage zur Durchführung des beschriebenen Verfahrens.The invention relates to a method for strengthening reinforcing steel, in particular weldable reinforcing steel, which was produced by hot rolling, the reinforcing steel being continuously subjected to a mechanical deformation in a continuous cold process and thereby being adjusted, inter alia, with regard to its yield strength and its elongation. The term reinforcing steel in the context of the invention denotes ribbed and non-ribbed reinforcing steel, in particular also reinforcing steel with inclined ribs and optionally longitudinal ribs, e.g. Reinforcing steel according to DIN 488. The invention further relates to a system for performing the described method.

Im Rahmen der bekannten Maßnahmen, von denen die Erfindung ausgeht, ist die mechanische Verformung eine Kaltreckung. Bei dem in die großtechnische Praxis eingeführten Verfahren resultiert das Recken aus einer Torsionsverformung mit Hilfe einer Torsionsmaschine, die diskontinuierlich arbeitet. Die diskontinuierliche Verfahrensführung stört den betrieblichen Ablauf. Für die einzustellende Streckgrenze sowie für die einzustellende Reckung müssen verhältnismäßig große, unvermeidbare Toleranzen zugelassen und berücksichtigt werden. Insbesondere sind die Werte für die Streckgrenze und die Reckung über die Länge eines Betonstahls nach Maßgabe der unterschiedlichen Reckungsabschnitte, die zu der diskontinuierlichen Verfahrensweise gehören, wenig gleichmäßig. Die Dauerschwingungsfestigkeit des so gereckten Betonstahls ist häufig unbefriedigend. Es besteht bei Schwingungsbeanspruchungen Dauerbruchgefahr. Andererseits verlangt die Praxis im zunehmenden Maße auch hohe Werte für die Dauerschwingungsfestigkeit. - Wegen der beschriebenen Probleme wird, um bei Betonstahl die vorgeschriebenen Werte für die Streckgrenze und die Dehnung einzuhalten, häufig von der beschriebenen Kaltreckung durch Torsion Abstand genommen und werden die vorgeschriebenen physikalischen Eigenschaften durch Microlegierung eingestellt, insbesondere durch Zugabe von Vanadium. Das führt zu befriedigenden Ergebnissen. Das ist jedoch wegen der Notwendigkeit, Vanadium zuzulegieren, aufwendig, zumal die Vanadium-Preise in der Tendenz seit vielen Jahren steigen und weitere Steigungen zu erwarten sind.Within the scope of the known measures from which the invention is based, the mechanical deformation is cold stretching. In the process introduced in large-scale industrial practice, the stretching results from a torsional deformation with the aid of a torsional machine that works discontinuously. The discontinuous procedure interferes with the operational process. Relatively large, unavoidable tolerances must be permitted and taken into account for the yield strength to be set and for the stretching to be set. In particular, the values for the yield strength and the stretching over the length of a reinforcing steel are not very uniform in accordance with the different stretching sections which belong to the discontinuous procedure. The fatigue strength of the stretched reinforcing steel is often unsatisfactory. There is a risk of fatigue failure in the event of vibration stress. On the other hand, practice increasingly demands high values for the fatigue strength. - Because of the problems described, in order to comply with the prescribed values for the yield strength and the elongation for reinforcing steel, the cold stretching described by torsion is often avoided and the prescribed physical properties are set by microalloying, in particular by adding vanadium. This leads to satisfactory results. However, this is complex because of the need to add vanadium, especially since the vanadium prices have been rising for many years and further increases are expected.

In neuerer Zeit ist darüber berichtet worden, daß das Microlegieren durch ein kontinuierliches Recken ersetzt werden kann (Werkzeitschrift "Report" der Hamburger Stahlwerke Gesellschaft mit beschränkter Haftung vom 22. Juni 1969, Seite 11). Hier wurde mit einer Reckmaschine gearbeitet, die zwei mit unterschiedlicher Umfangsgeschwindigkeit arbeitende Reckscheiben aufweist. In diesen Zusammenhang gehört eine ältere Patentanmeldung (EP 90 111 026.2, PatG § 3 (2)), die lehrt, daß der Stahldraht kontinuierlich gereckt wird und dazu über zumindest zwei angetriebene Reckscheiben oder Reckwalzen geführt wird, die mit unterschiedlichen Umfangsgeschwindigkeiten auf den Stahldraht arbeiten, daß über die Umfangsgeschwindigkeitsdifferenz der beiden Reckscheiben der Reckgrad gesteuert wird, und daß über die Reckgeschwindigkeit die Streckgrenze und die Dehnung gesteuert bzw. eingestellt werden. Dabei wird der Stahldraht mit einem Mindestkrümmungsradius von 500 mm über die Reckscheiben geführt. Im Rahmen dieser Maßnahmen ist die Biegeverformung an den Reckscheiben spärlich. Sie wird so eingerichtet, daß die Reibungskräfte, die auf den Betonstahl einwirken, zur ausreichend schlupffreien Mitnahme des Betonstahls ausreichen und die beschriebene Reckung im Bereich zwischen den beiden Reckscheiben bewirken. Die Biegeverformung an den Reckscheiben bewirkt keinen zur Verfestigung selbst erheblich beitragenden Effekt. Die Rekkung erfolgt in Längsrichtung des Betonstahls. Die erzeugte Verfestigung ist insoweit eine einachsige Kaltverfestigung mit beachtlicher Anisotropie über den Querschnitt des Betonstahls. Die durch diese Kaltverfestigung erreichbaren Qualitätsverbesserungen können durch den Bauschinger Effekt beeinträchtigt sein, was für bestimmte Anwendungen des hergestellten und verfestigten Betonstahls stört. - Der Bauschinger Effekt beschreibt eine besondere physikalische Erscheinung: Die plastische Verformung eines Werkstoffes in einer Richtung setzt nach den Erkenntnissen von Bauschinger die Elastizitätsgrenze bei anschließender Verformung in entgegengesetzter Richtung herab. Der Bauschinger Effekt beruht auf der Ausbildung von inneren Spannungen, die entgegen der ursprünglichen Verformungsrichtung wirksam sind.It has recently been reported that microalloying can be replaced by continuous stretching (work magazine "Report" of the Hamburger Stahlwerke Gesellschaft with limited liability of June 22, 1969, page 11). Here, a stretching machine was used, which has two stretching disks working at different peripheral speeds. In this context, an older patent application (EP 90 111 026.2, PatG § 3 (2)) belongs, which teaches that the steel wire is continuously stretched and is guided over at least two driven stretching disks or stretching rollers that work on the steel wire at different peripheral speeds that the degree of stretching is controlled via the difference in circumferential speed of the two stretching disks, and that the stretching limit and the elongation are controlled or set via the stretching speed. The steel wire is guided over the stretching discs with a minimum radius of curvature of 500 mm. As part of these measures, the bending deformation on the stretching discs is sparse. It is set up in such a way that the frictional forces acting on the reinforcing steel are sufficient to take the reinforcing steel sufficiently slip-free and cause the stretching described in the area between the two stretching disks. The bending deformation on the stretching discs does not have any effect which significantly contributes to the strengthening itself. The drawing takes place in the longitudinal direction of the reinforcing steel. In this respect, the hardening generated is a uniaxial strain hardening with considerable anisotropy across the cross-section of the reinforcing steel. The quality improvements that can be achieved through this strain hardening can be impaired by the Bauschinger effect, which is disruptive for certain applications of the manufactured and hardened reinforcing steel. - The Bauschinger effect describes a special physical phenomenon: According to Bauschinger's knowledge, the plastic deformation of a material in one direction lowers the elastic limit with subsequent deformation in the opposite direction. The Bauschinger effect is based on the formation of internal stresses that are effective against the original direction of deformation.

Der Erfindung liegt die Aufgabe zugrunde, das eingangs beschriebene Verfahren so zu führen, daß eine über den Querschnitt des Betonstahls sehr isotrope Kaltverfestigung erreicht wird. Der Erfindung liegt fernerhin die Aufgabe zugrunde, eine Anlage anzugeben, die zur Durchführung des erfindungsgemäßen Verfahrens besonders geeignet ist.The invention has for its object to carry out the method described above so that a very isotropic strain hardening is achieved over the cross section of the reinforcing steel. The invention is further based on the object of specifying a system which is particularly suitable for carrying out the method according to the invention.

Zur Lösung dieser Aufgabe lehrt die Erfindung in verfahrenstechnischer Hinsicht, daß der Betonstahl im torsionsfreien Durchlauf in mehreren verschiedenen Biegeebenen, die äquidistant gegeneinander versetzt sind, einer mehrstufigen Biegeverformung um eine Biegerolle unterworfen sowie dadurch in den Biegeebenen superponiert mehrachsig kaltverfestigt wird, wobei eine Verlängerung des Betonstahls erreicht wird, und daß die Streckgrenze sowie die Dehnung durch das Maß der Verlängerung eingestellt werden. Vorzugsweise wird der Betonstahl in drei verschiedenen Biegeebenen, die um etwa 120° gegeneinander versetzt sind, einer dreistufigen Biegeverformung unterworfen. Der Betonstahl kann mit einer Durchlaufgeschwindigkeit von 1 bis 25 m/sec der mehrstufigen Biegeverformung unterworfen werden. - Da erfindungsgemäß der Betonstahl eine Biegung in gegeneinander wie beschrieben versetzten Biegeebenen erfährt, kann insoweit, um die Betonstahlachse betrachtet, von einem mehrachsigen Biegezustand oder auch von einem mehrachsigen Kaltverfestigungszustand gesprochen werden. Das führt im Durchlaufverfahren dazu, daß jeder Punkt der Betonstahloberfläche kontinuierlich wechselnd dieser Beanspruchung unterworfen wird. Das Resultat besteht in einer sehr gleichmäßigen und sehr isotropen Verfestigung und einer sehr definierten und gleichmäßigen Querschnittsabnahme. Überraschenderweise verschwindet der störende Bauschinger Effekt. Die Qualitätswerte des Betonstahls in bezug auf Streckgrenze, Zugfestigkeit und Bruchdehnung werden wesentlich verbessert und lassen sich über die Verlängerung, d.h. den Reckgrad, einstellen bzw. steuern. Die erfindungsgemäßen Effekte sind besonders ausgeprägt, wenn mit drei Biegeebenen wie beschrieben gearbeitet wird.To achieve this object, the invention teaches from a process engineering point of view that the reinforcing steel in the torsion-free pass in several different bending planes, which are offset equidistantly from one another, is subjected to a multistage bending deformation around a bending roller and is thus superposed in the bending planes multi-axis strain-hardening, with an extension of the reinforcing steel is reached, and that the yield point and the elongation are set by the extent of the extension. The reinforcing steel is preferably subjected to three-stage bending deformation in three different bending planes which are offset from one another by approximately 120 ° fen. The reinforcing steel can be subjected to multi-stage bending deformation at a throughput speed of 1 to 25 m / sec. - Since, according to the invention, the reinforcing steel undergoes a bending in mutually offset bending planes, one can speak of a multi-axis bending condition or also of a multi-axis strain hardening condition when viewed around the reinforcing steel axis. In the continuous process, this means that every point on the reinforcing steel surface is subjected to this stress in a continuously changing manner. The result is a very even and very isotropic hardening and a very defined and even decrease in cross-section. Surprisingly, the annoying Bauschinger effect disappears. The quality values of the reinforcing steel in terms of yield strength, tensile strength and elongation at break are significantly improved and can be adjusted or controlled via the extension, ie the degree of stretching. The effects according to the invention are particularly pronounced when working with three bending planes as described.

Im einzelnen bestehen im Rahmen der Erfindung mehrere Möglichkeiten der weiteren Ausbildung und Gestaltung. So ist eine bevorzugte Ausführungsform der Erfindung dadurch gekennzeichnet, daß mit einem Verlängerungsgrad des Betonstahls von zumindest 5% gearbeitet wird. Es versteht sich, daß im Rahmen der Erfindung eine ausreichend ausgeprägte Biegeverformung verwirklicht werden muß. Bewährt hat sich, daß der Betonstahl an den einzelnen Biegerollen mit einem Umschlingungswinkel von 100 bis 150° geführt wird. Dabei kann mit Biegerollen gearbeitet werden, die einen Durchmesser in dem Durchmesserbereich aufweisen, der im Patentanspruch 6 angegeben worden ist.There are several options for further training and design within the scope of the invention. A preferred embodiment of the invention is characterized in that the length of the reinforcing steel is at least 5%. It goes without saying that a sufficiently pronounced bending deformation must be realized within the scope of the invention. It has been proven that the reinforcing steel is guided on the individual bending rollers with a wrap angle of 100 to 150 °. It can be used with bending rollers that have a diameter in the diameter range that has been specified in claim 6.

Im Rahmen der Erfindung ist die Verfestigung über die Verlängerung, die der Betonstahl im erfindungsgemäßen Verfahren erfährt, einrichtbar und steuerbar. Dazu lehrt die Erfindung im einzelnen, daß die Verlängerung, die der Betonstahl bei der Verfestigung erfährt, und damit die Verfestigung, selbst bei vorgegebener Durchlaufgeschwindigkeit durch Auswahl des Durchmessers der Biegerollen und/oder Variation des Umschlingungswinkels eingerichtet wird. Im Rahmen der Erfindung liegt es, den Durchmesser der Biegerolle und/oder den Umschlingungswinkel in den einzelnen Biegeverformungsstufen unterschiedlich einzustellen. Jedenfalls kann der Umschlingungswinkel betriebsmäßig verstellt werden.Within the scope of the invention, the consolidation can be set up and controlled via the extension that the reinforcing steel undergoes in the method according to the invention. For this purpose, the invention teaches in detail that the extension, which the reinforcing steel undergoes during the hardening, and thus the hardening, is set up, even at a predetermined throughput speed, by selecting the diameter of the bending rollers and / or varying the wrap angle. It is within the scope of the invention to set the diameter of the bending roller and / or the wrap angle differently in the individual bending deformation stages. In any case, the wrap angle can be adjusted operationally.

Das erfindungsgemäße Verfahren eignet sich für die verschiedensten, in der Bauindustrie üblichen Betonstähle. Bewährt hat sich das Verfahren insbesondere, wenn mit einem Betonstahl im Durchmesserbereich von 6 bis 14 mm gearbeitet wird. Gegenstand der Erfindung ist es insbesondere, daß ein Betonstahl nach DIN 488 dem erfindungsgemäßen Verfahren unterworfen wird. Im Anschluß an die Verfestigung kann mit üblichen Hilfsmitteln ein Richten des Betonstahls durchgeführt werden, dabei oder danach erfolgt das übliche Ablängen auf die Längen, die der Betonstahl für die Verwendung haben muß.The method according to the invention is suitable for a wide variety of reinforcing steels customary in the construction industry. The method has proven particularly useful when working with a reinforcing steel in the diameter range of 6 to 14 mm. The object of the invention is in particular that a reinforcing steel according to DIN 488 is subjected to the method according to the invention. Following the consolidation, the reinforcing steel can be straightened using conventional aids, or afterwards the usual cutting to the lengths that the reinforcing steel must have for use.

Gegenstand der Erfindung ist auch eine Anlage für die Durchführung einer Ausführungsform des beschriebenen Verfahrens. Sie ist grundsätzlich gekennzeichnet durch drei Rollenrichtwerke mit jeweils definierter Biegeebene, die in Durchlaufrichtung des Betonstahls hintereinander, gegeneinander um 120° versetzt, angeordnet sind, wobei jedes Rollenrichtwerk zwei Stützrollen und eine im Bereich zwischen den Stützrollen angeordnete Biegerolle aufweist. Nach bevorzugter Ausführungsform der Erfindung ist die Biegerolle gegenüber den Stützrollen verstellbar und ist dadurch der Umschlingungswinkel einstellbar.The invention also relates to a plant for carrying out an embodiment of the method described. It is basically characterized by three roller straighteners, each with a defined bending plane, which are arranged one behind the other in the direction of travel of the reinforcing steel, offset from each other by 120 °, each roller straightener having two support rollers and one bending roller arranged in the area between the support rollers. According to a preferred embodiment of the invention, the bending roller is adjustable relative to the support rollers and the wrap angle is thereby adjustable.

Im folgenden wird die Erfindung anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung ausführlicher erläutert. Es zeigen in schematischer Darstellung

  • Fig. 1 die Rollenanordnung einer Anlage für die Durchführung des beschriebenen Verfahrens,
  • Fig. 2 eine Ansicht des Gegenstandes der Fig. 1 in Durchlaufrichtung, in gegenüber der Fig. 1 wesentlich vergrößertem Maßstab.
In the following, the invention will be explained in more detail with reference to a drawing showing only one embodiment. They show a schematic representation
  • 1 shows the roller arrangement of a system for carrying out the described method,
  • Fig. 2 is a view of the object of FIG. 1 in the direction of passage, on a significantly enlarged scale compared to FIG. 1.

In den Fig. 1 und 2 erkennt man drei Rollenrichtwerke 1, 2, 3 mit jeweils definierter Biegeebene A, B, C, die in Durchlaufrichtung des Betonstahls 4 hintereinander angeordnet sind. Sie sind gegeneinander um etwa 120° versetzt, wozu insbesondere auf die Fig. 2 verwiesen wird. Aus der Fig. 1 entnimmt man, daß jedes Rollenrichtwerk 1, 2, 3 zwei Stützrollen 5 und eine im Bereich zwischen den Stützrollen 5 angeordnete Biegerolle 6 aufweist. Diese ist in Richtung des Pfeiles, der in Fig. 1 im Bereich der Mitte angeordnet worden ist, verstellbar. Arbeitet man mit der erfindungsgemäßen Anlage, so wird der Betonstahl 4 im torsionsfreien Durchlauf in drei verschiedenen Biegeebenen A, B, C, die um etwa 120° gegeneinander versetzt sind, einer dreistufigen Biegeverformung um jeweils eine Biegerolle 6 unterworfen. Er wird dadurch in den drei Biegeebenen A, B, C superponiert dreiachsig kaltverfestigt. Dabei wird eine Verlängerung des Betonstahls 4 erreicht. Die Streckgrenze und die Dehnung können durch das Maß der Verlängerung eingestellt werden. Dazu können die Biegerollen 6 bezüglich des Biegerollendurchmessers d besonders ausgewählt und kann der Umschlingungswinkel a besonders eingestellt werden. - Entsprechend verfährt man, wenn mit mehr als drei Biegeebenen gearbeitet wird.1 and 2, three roller straighteners 1, 2, 3 can be seen, each with a defined bending plane A, B, C, which are arranged one behind the other in the direction of travel of the reinforcing steel 4. They are offset from one another by approximately 120 °, for which reference is made in particular to FIG. 2. 1 that each roller straightener 1, 2, 3 has two support rollers 5 and a bending roller 6 arranged in the area between the support rollers 5. This can be adjusted in the direction of the arrow, which has been arranged in the region of the center in FIG. 1. If you work with the system according to the invention, the reinforcing steel 4 is subjected to a three-stage bending deformation by one bending roller 6 in each case in the torsion-free passage in three different bending planes A, B, C, which are offset from one another by approximately 120 °. As a result, it is strain-hardened in three axes A, B, C superposed on three axes. An extension of the reinforcing steel 4 is achieved. The yield strength and the elongation can be adjusted by the extent of the extension. For this purpose, the bending rollers 6 can be specially selected with respect to the bending roller diameter d and the wrap angle a can be particularly adjusted. - Do the same, if with more working as three bending levels.

AusführungsbeispielEmbodiment

Ein gerippter Walzdraht der Abmessung 10 mm, Rippung gem. DIN 488, Stahl IV, und folgender Analyse:

  • Kohlenstoff : 0,19%
  • Silizium : 0,23 %
  • Mangan : 0,79 %
A corrugated wire rod with the dimension 10 mm, corrugation acc. DIN 488, steel IV, and the following analysis:
  • Carbon: 0.19%
  • Silicon: 0.23%
  • Manganese: 0.79%

Rest Eisen und übliche Beimengungen weisen im warmgewalzten Zustand folgende mechanische Eigenschaften auf:

  • Streckgrenze Rp0,2 :
  • 361 N/mm2
  • Zugfestigkeit Rm :
  • 562 N/mm2
  • Bruchdehnung Aio :
  • 24,7%
  • Verhältnis Rm/RpO,2 :
  • 1,56
The rest of iron and usual additives have the following mechanical properties when hot-rolled:
  • Yield strength Rp0.2:
  • 361 N / mm 2
  • Tensile strength Rm:
  • 562 N / mm 2
  • Elongation at break Aio:
  • 24.7%
  • Ratio Rm / RpO, 2:
  • 1.56

Dieser warmgerippte Walzdraht wird über die beschriebene Anordnung geführt. Der Verlängerungsgrad beträgt ca. 6 %. Nach diesem kontinuierlichen Prozeß der Verfestigung ergaben sich folgende mechanische Eigenschaften (ohne künstliche Alterungsbehandlung):

  • Streckgrenze Rp0,2 :
  • 509 N/mm2
  • Zugfestigkeit Rm :
  • 626 N/mm2
  • Bruchdehnung Aio :
  • 19,2 %
  • Gleichmaßdehnung A10GI :
  • 9,6 %
  • Verhältnis Rm/RpO,2 :
  • 1,23
This hot-finned wire rod is guided over the arrangement described. The degree of extension is approx. 6%. After this continuous process of solidification, the following mechanical properties resulted (without artificial aging treatment):
  • Yield strength Rp0.2:
  • 509 N / mm 2
  • Tensile strength Rm:
  • 626 N / mm 2
  • Elongation at break Aio:
  • 19.2%
  • Uniform expansion A 10GI :
  • 9.6%
  • Ratio Rm / RpO, 2:
  • 1.23

Damit entspricht dieses Material den Anforderungen der DIN 488 Sorte B St 500 S.This material thus meets the requirements of DIN 488 grade B St 500 S.

Das Biege-Verfestigungs-Verfahren wird bevorzugt mit Betonstahl in folgendem Analysenrahmen ausgeführt:

  • Kohlenstoff : 0,14 - 0,22 %
  • Silizium : 0,15 - 0,40 %
  • Mangan : 0,60 - 1,30 %
The bending strengthening process is preferably carried out with reinforcing steel in the following analysis frame:
  • Carbon: 0.14-0.22%
  • Silicon: 0.15 - 0.40%
  • Manganese: 0.60 - 1.30%

Rest Eisen und Beimengungen-Gehalte entsprechen der Vorgaben des Instituts für Bautechnik, Berlin.The rest of the iron and admixture contents correspond to the specifications of the Institut für Bautechnik, Berlin.

Dem Biege-Verfestigungs-Vorgang nachgeschaltet ist eine kontinuierlich arbeitende Richtanlage, die das so verfestigte Material richtet und zu Stäbe definierter Länge ablängt. Beide Anlagen sind in Linie aufgestellt und arbeiten synchron. Das gerichtete Material kann als Vormaterial für Biege-und Bewehrungsbetriebe verwandt werden.The bending-hardening process is followed by a continuously working straightening system, which straightens the solidified material and cuts it to bars of a defined length. Both systems are set up in a line and work synchronously. The straightened material can be used as primary material for bending and reinforcement companies.

Claims (12)

1. Verfahren zur Verfestigung von Betonstahl, insbesondere von schweißbarem Betonstahl, der durch Warmwalzen hergestellt wurde, wobei der Betonstahl kontinuierlich im Durchlaufverfahren kalt einer mechanischen Verformung unterworfen und dadurch unter anderem in bezug auf seine Streckgrenze und seine Dehnung eingestellt wird, dadurch gekennzeichnet, daß der Betonstahl im torsionsfreien Durchlauf in mehreren verschiedenen Biegeebenen, die äquidistant gegeneinander versetzt sind, einer mehrstufigen Biegeverformung um eine Biegerolle unterworfen sowie dadurch in den Biegeebenen superponiert mehrachsig kaltverfestigt wird, wobei eine Verlängerung des Betonstahls erreicht wird, und daß die Streckgrenze sowie die Dehnung durch das Maß dieser Verlängerung eingestellt werden. 1. A process for the strengthening of reinforcing steel, in particular weldable reinforcing steel, which was produced by hot rolling, the reinforcing steel being continuously subjected to mechanical deformation in a continuous cold process and thereby adjusted, inter alia, with respect to its yield strength and its elongation, characterized in that the Reinforcing steel in a torsion-free pass in several different bending levels, which are offset equidistantly from each other, is subjected to a multi-stage bending deformation around a bending roller and is thus superposed multi-axially strain hardened in the bending planes, whereby an extension of the reinforcing steel is achieved, and that the yield strength and the elongation are set by the extent of this extension. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Betonstahl in drei verschiedenen Biegeebenen, die um etwa 120 ° gegeneinander versetzt sind, der Biegeverformung unterworfen werden.2. The method according to claim 1, characterized in that the reinforcing steel in three different bending planes, which are offset from one another by approximately 120 °, are subjected to the bending deformation. 3. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß der Betonstahl mit einer Durchlaufgeschwindigkeit von 1 bis 25 m/sec der dreistufigen Biegeverformung unterworfen wird.3. The method according to any one of claims 1 or 2, characterized in that the reinforcing steel is subjected to the three-stage bending deformation at a throughput speed of 1 to 25 m / sec. 4. Verfahren nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß mit einem Verlängerungsgrad des Betonstahls von zumindest 5%, vorzugsweise von zumindest 7%, gearbeitet wird.4. The method according to any one of claims 1 or 2, characterized in that an elongation degree of the reinforcing steel of at least 5%, preferably of at least 7%, is used. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Betonstahl an den einzelnen Biegerollen mit einem Umschlingungswinkel von 100 bis 150° geführt wird.5. The method according to any one of claims 1 to 4, characterized in that the reinforcing steel is guided on the individual bending rollers with a wrap angle of 100 to 150 °. 6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß mit Biegerollen gearbeitet wird, die einen Durchmesser im Bereich von 70 bis 250 mm aufweisen.6. The method according to any one of claims 1 to 5, characterized in that work is carried out with bending rolls which have a diameter in the range from 70 to 250 mm. 7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Verlängerung, die der Betonstahl bei der Verfestigung erfährt, und damit die Verfestigung, bei vorgegebener Durchlaufgeschwindigkeit, durch Auswahl des Durchmessers der Biegerollen und/oder Variation des Umschlingungswinkels eingerichtet wird.7. The method according to any one of claims 1 to 6, characterized in that the extension, which the reinforcing steel undergoes during the consolidation, and thus the consolidation, at a given throughput speed, by selecting the diameter of the bending rollers and / or variation of the wrap angle is established. 8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der Durchmesser der Biegerolle und/oder der Umschlingungswinkel in den einzelnen Biegeverformungsstufen unterschiedlich eingestellt werden.8. The method according to any one of claims 1 to 7, characterized in that the diameter of the bending roller and / or the wrap angle in the individual bending deformation stages are set differently. 9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß mit einem Betonstahl im Durchmesserbereich von 6 bis 14 mm gearbeitet wird.9. The method according to any one of claims 1 to 8, characterized in that one works with a reinforcing steel in the diameter range of 6 to 14 mm. 10. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß ein Betonstahl nach DIN 488 der Verfestigung unterworfen wird.10. The method according to any one of claims 1 to 9, characterized in that a reinforcing steel according to DIN 488 is subjected to consolidation. 11. Anlage für die Durchführung des Verfahrens nach einem der Ansprüche 2 bis 10, gekennzeichnet durch drei Rollenrichtwerke(1, 2, 3) mit jeweils definierter Biegeebene (A, B, C), die in Durchlaufrichtung des Betonstahls (4) hintereinander und gegeneinander jeweils um etwa 120° versetzt angeordnet sind, wobei jedes Rollenrichtwerk (1, 2, 3) zwei Stützrollen (5) und eine im Bereich zwischen den Stützrollen (5) angeordnete Biegerolle (6) aufweist.11. Plant for carrying out the method according to one of claims 2 to 10, characterized by three roller straightening units (1, 2, 3), each with a defined bending plane (A, B, C), one behind the other and against each other in the direction of passage of the reinforcing steel (4) are each offset by approximately 120 °, each roller straightener (1, 2, 3) having two support rollers (5) and one bending roller (6) arranged in the region between the support rollers (5). 12. Anlage nach Anspruch 11, dadurch gekennzeichnet, daß die Biegerolle (6) gegenüber den Stützrollen (5) verstellbar und dadurch der Umschlingungswinkel (a) einstellbar ist.12. Plant according to claim 11, characterized in that the bending roller (6) relative to the support rollers (5) is adjustable and thereby the wrap angle (a) is adjustable.
EP91112149A 1990-08-03 1991-07-20 Method and device for strengthening of reinforcing bars for concrete Expired - Lifetime EP0469410B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4024653 1990-08-03
DE4024653A DE4024653C1 (en) 1990-08-03 1990-08-03

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AT (1) ATE106287T1 (en)
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CN107604139A (en) * 2017-11-06 2018-01-19 舟山市7412工厂 The curing system and its method for curing of a kind of raw metal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2449268B2 (en) * 1973-10-19 1977-11-17 Vereinigte Österreichische Eisen- und Stahlwerke - Alpine Montan AG, Wien DEVICE FOR CONTINUOUS COLD STRENGTHENING OF A METALLIC WIRE ROD
US4216666A (en) * 1978-09-18 1980-08-12 Extruded Metals Method of relieving stress in extruded sections
EP0194478A2 (en) * 1985-03-08 1986-09-17 M.E.P. Macchine Elettroniche Piegatrici S.p.A. Device for straightening rods or wire without relative rotation of succeeding elements of material about the longitudinal axis
EP0403916A1 (en) * 1989-06-14 1990-12-27 KT - BAUSTAHL Vertriebsgesellschaft mbH. Method for production of ribbed reinforcing steel

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Publication number Priority date Publication date Assignee Title
DE626756C (en) * 1934-07-28 1936-03-02 Alfred Varley Sims Automatic valve
DE746251C (en) * 1941-05-13 1945-01-08 Kohle- Und Eisenforschung Gmbh Process for increasing the number of bends and twists of steel wires that have been spun in operation
DE1533992A1 (en) * 1967-05-16 1970-02-19 Rehm Gallus Process for increasing the elastic limit, the yield strength and, if necessary, the breaking strength of steel by cold deformation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2449268B2 (en) * 1973-10-19 1977-11-17 Vereinigte Österreichische Eisen- und Stahlwerke - Alpine Montan AG, Wien DEVICE FOR CONTINUOUS COLD STRENGTHENING OF A METALLIC WIRE ROD
US4216666A (en) * 1978-09-18 1980-08-12 Extruded Metals Method of relieving stress in extruded sections
EP0194478A2 (en) * 1985-03-08 1986-09-17 M.E.P. Macchine Elettroniche Piegatrici S.p.A. Device for straightening rods or wire without relative rotation of succeeding elements of material about the longitudinal axis
EP0403916A1 (en) * 1989-06-14 1990-12-27 KT - BAUSTAHL Vertriebsgesellschaft mbH. Method for production of ribbed reinforcing steel

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EP0469410B1 (en) 1994-06-01
ATE106287T1 (en) 1994-06-15
DK0469410T3 (en) 1994-07-11
DE9106386U1 (en) 1991-08-08
ES2054405T3 (en) 1994-08-01

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