EP2011583A1 - Wire forming machine - Google Patents

Abstract

The machine (1) has a tool plate (7) with a wire feeder and a wire guide (2) for transporting fed wire (3) to a working area of the machine, where tools (15, 17, 18) are fixedly attached to the tool plate. The tool plate is fitted on a base plate (8) provided with a recess that corresponds to a recess of the tool plate, where the tool plate is displaceable along a direction on the base plate, and the base plate is displaceable on a machine frame along another direction, and both directions have an inclination of 45 degrees to a vertical normal axis of the machine.

Description

The invention relates to a wire-forming machine, in particular a spring-bending or spring-winch machine, with a machine frame, a wire feed, a wire guide for conveying the supplied wire in a working range of the machine in which the wire through one or more tools Tools are processed and / or reshaped, for which purpose each tool can be transferred from a wire remote starting position via a feed movement in a working position on the wire and all tools on a provided on the machine frame tool plate around a recess in this around, through which the wire Furthermore, each tool is immovable to the tool plate in the direction of its feed movement relative to the tool plate and its feed movement is made in its working position only by a corresponding movement of the tool plate and the tools ugplatte on a provided with one of the recess of the tool plate recess second plate is seated, wherein the tool plate along a first direction on the second plate and these are movable along a second direction relative to the machine frame.

From the DE 101 34 828 B4 a wire-forming machine in the form of a leg spring machine is known in which a plurality of tools are mounted on a plate. Each tool has a base plate and is provided with its own, only assigned to him drive, by its operation, it can be moved radially toward the wire or away from it. The base plates can be coupled with a ring that can be pivoted about the wire axis and on the fine adjustment of the tools to the wire in the manufacturing process can be achieved (swing axis). In this known machine, however, each tool is provided with its own drive, which makes the machine consuming and expensive.

In the DE 103 42 451 A is described a leg spring machine in which the arranged on a vertical rotary table tool units can be mounted in any angular position on this. To drive the movement of the tool units, a central drive wheel is provided which drives cam shaft blocks which can be connected to the tool units in the sense of a cam control. Although each tool unit does not require its own drive, which is only assigned to it, the time sequence of the movements is not sufficiently freely programmable.

The wire forming machine from the DE 199 38 905 B4 again represents a leg spring machine having two mounted next to the wire guide tool turret. These sit on a 3D cross table and can thus be positioned anywhere in the room. The turret can additionally be rotated about an axis parallel to the wire axis, whereby different tools at different positions can be brought into engagement with the wire. In this known machine, the tool change is very slow and it limits the performance of the machine clearly. Moreover, this known machine requires more space than conventional leg spring machines.

From the DE 299 13 014 U is a forming unit in modular form for wire bending machines known, the module consists of a base plate with a drive, a linear guide and a crank. The forming units can be easily mounted on a machine wall and dismantled again. The disadvantage, however, is that each tool unit in turn is assigned its own drive, which in turn makes the machine expensive, especially with a larger number of tools.

The thigh spring machine from the EP 1 637 251 A works with a feeder unit mounted on either a 2D or a 3D cross table. Thus, the wire can be transported to the radially mounted tools, which, however, very large masses must be moved. The performance and rigidity of the known machine are therefore reduced.

Another leg spring machine with a two-dimensionally movable feeder is from the DE 697 15 953 T known to optimally position the wire to the tool. The tool head is arranged above the feeder and can be moved horizontally and vertically. In addition, a rotation axis for the tool is also provided. In this known machine, however, only one tool can be attached to the tool head. For cutting a separate tool unit is needed. The arrangement of the tool head is fixed (namely vertically from above).

A leg spring machine of the type mentioned is from the JP-P2007-30038A known. In this case, the tool table is linear along a first direction on the second plate and this movable linearly along a second direction relative to the machine frame, wherein the first direction is horizontal and the second direction is vertical to the machine longitudinal axis. In practice, however, it turns out that the known machine comes in operation in very strong vibrations and a significant shaking of the whole machine occurs, which leads to highly undesirable vibrations in each already created wire bending parts, which adversely affects the whole winding or wind process ,

Proceeding from this, the present invention seeks to provide a wire forming machine of the type mentioned so that in a further simple structure, a particularly low-vibration operation of the machine can be achieved and thus a high operating performance can be achieved.

According to the invention this is achieved in a wire forming machine of the type mentioned above in that the two directions of movement of the tool plate and the second plate each extend at an inclination of approximately 45 ° to the vertical vertical axis of the machine.

The wire forming machine according to the invention leads quite surprisingly to an extremely low-vibration operation, which makes it possible to achieve very high production speeds with very good precision, without disturbing and the ejection impairing machine vibrations occur. This is probably due to the fact that in the inventive alignment of the axes of movement of both movable plates, the lateral Verfahramplituden each of the two plates are usually smaller than in a vertical / horizontal orientation of the two axes.

In the invention, the moving mass of the tool plate is relatively small, as always only the necessary tools must be mounted. Due to the possibility of arbitrary arrangement of the tools whose attachment can be made so that the travel paths of the tool plate are reduced to a minimum.

In the case of the wire-forming machine according to the invention, the longitudinal axes of all tools mounted on the tool plate are very particularly preferably arranged at an acute angle, very particularly preferably at an angle of 30 ° or 45 ° to the vertical vertical axis of the machine, resulting in a particularly favorable force support to the ground which applies in particular to a job of 45 °.

Particularly preferably, the tool plate and the second plate are each moved to two mutually parallel linear guide powers, if the respective movements are to be made linear.

Advantageously, in the invention, the tool plate and the second plate are mounted in the form of a 2D cross table.

It is also particularly advisable, if on the second plate, the drive for moving the tool plate is mounted, whereby he then always taken in the direction of movement of the second plate relative to the machine frame and via its drive connection to the tool plate, the superposition of the movement of the second plate which can be done in a simple way the tool plate.

Another preferred embodiment of the invention is also given by the fact that the tool plate and the second plate represent parts of a 3D cross table and thus together are still movable in a direction parallel to the wire direction, whereby a three-dimensional feed movement of all tools is possible.

In a further preferred embodiment of the invention, the tool plate with the tools attached to it is still designed to pivot about an axis perpendicular to the wire conveying direction, whereby it can be achieved that the tools in the working position no longer perpendicular to the wire attacks, which is desirable in some cases ,

It may also be advantageous for certain applications that mounted on the tool plate tools are individually adjustable perpendicular to this. For this purpose, the respectively relevant tool holder can be provided with a corresponding adjustment device, which can be achieved in the individual case as optimal as possible alignment for wire guide.

In certain applications, it is also advantageous if tools are provided on the tool plate with an additional rotary drive, such as a turning tool with a rotary mandrel, so that with this in the working position then rotational movements can be performed.

Particularly preferably, it is further provided that the recess of the tool plate is in each relative position of the tool plate and the second plate to each other fully within the surface area defined by the recess of the second plate.

Advantageously, in the recess of the tool plate, a peripheral to the edge of the cover plate is attached, through which the gap between the tool plate and machine frame is covered, whereby no parts, fingers oa. between the plates. Preferably, this shroud will be in four places, e.g. at four corners of the recess, bolted to the tool plate.

The two movable plates are arranged relative to each other and to the front plate of the machine frame so that the gaps between the tool plate and the second plate and between the latter and the end wall of the machine frame each have a gap width in the range of 0.8 to 1.3 mm, preferably at 1 mm, lies. This can be achieved simply by the fact that the two movable plates are not designed as "full plates", but have recesses and pockets, wherein the linear guides and the guide carriage running thereon are each deeply embedded in the associated plate, that ultimately the desired narrow gap width is reached.

The recess in the second plate is preferably made substantially rectangular, but more preferably square, which is favorable for symmetry and weight reasons.

It is also of particular advantage if a tool designed as a cutting blade is not mounted on the tool plate, but on a support arm on the machine frame, whereby the very considerable cutting forces no longer on the tool plate, their storage on the second plate and their storage on the Machine frame transferred, but are introduced directly into the machine frame. This measure also contributes to a quiet, low-vibration operation of the machine according to the invention and to reduced driving forces in both moving plates.

The wire forming machine according to the invention leads due to their relatively simple structure at relatively low cost and compared to many known machines to a significant cost. This is achieved by the simplification of the machine and the possible reduction in the number of drive axles, without having to accept higher power losses.

Fig. 1

eine perspektivische Vorderansicht einer erfindungsgemäßen Drahtverformungsmaschine in Form einer Schenkelfedermaschine;

Fig. 2

eine vergrößerte Perspektivdarstellung des Arbeitsbereiches der Schenkelfedermaschine aus Fig. 1, jedoch hier von vorne und schräg rechts oben, in der Arbeitsstellung Biegen;

Fig. 3

eine vergrößerte perspektivische Schrägansicht entsprechend Fig. 2, jedoch in der Arbeitsstellung beim Winden, sowie

Fig. 4

eine vergrößerte perspektivische Darstellung entsprechend den Fig. 2 und 3 der Maschine aus Fig. 1, jedoch hier in der Arbeitsstellung kurz vor dem Schnitt.

The invention will be explained in more detail by way of example with reference to the drawing in principle. Show it:

Fig. 1

a front perspective view of a wire forming machine according to the invention in the form of a leg spring machine;

Fig. 2

an enlarged perspective view of the work area of the leg spring machine Fig. 1 , but here from the front and diagonally right above, in the working position bending;

Fig. 3

an enlarged perspective oblique view accordingly Fig. 2 , but in the working position when winding, as well

Fig. 4

an enlarged perspective view corresponding to the Fig. 2 and 3 the machine off Fig. 1 , but here in the working position shortly before the cut.

Fig. 1 shows in a perspective oblique view from the front (top left) a wire forming machine in the form of a leg spring machine 1, a wire retraction (hidden in the figure), a straightening unit (not shown) and a wire guide 2 has. Both the wire intake, as well as the straightening unit and the wire guide 2 are rotatable about the longitudinal axis of the conveyed wire 3. These modules are known per se: the straightening unit consists of straightening rollers, which are mounted in different planes and by an appropriate delivery eliminate the residual stress in the wire 3 and thus bends in this or generate a straight as possible directed wire. The wire retraction consists of several pairs of driven rollers, which convey the wire 3 clamped between them as a result of their rotation through the wire guide 2 into the working area of the machine.

The leg spring machine 1 generally has a machine frame 4, which in Fig. 1 only shown in principle and which is provided on its front side with a machine front wall 5 (end wall).

On the machine front wall 5, a 2D cross table 6 is mounted, which comprises on its front side a tool plate 7, which is mounted on a second plate 8 as a base plate, slidably on this. On the base plate 8, two parallel, first linear guides 9 are mounted, along which the tool plate 7 on the base plate 8 in a direction x is movable, which is inclined at an angle of 45 ° to the vertical vertical axis HH of the leg spring machine 1 (in Fig. 1 : diagonally from bottom right to top left). For moving the tool plate 7 on the first linear guides 9 relative to the base plate 8, a spindle drive 10 is provided and mounted on a boom 11 of the base plate 8, so that it is taken with it on each movement of the base plate 8 fixed thereto.

Also on the machine front wall 5, two parallel, second linear guides 12 are mounted, on which the base plate 8 relative to the machine front wall 5 (and thus the machine frame 4) can be moved, in a direction y, which is perpendicular to the travel direction x of the tool plate 7 and also at 45 ° to the vertical Vertical axis HH of the leg spring machine runs (in Fig. 1 : from bottom left to top right).

To move the base plate 8 on the linear guides 12, a spindle drive 13 is likewise provided, which can be mounted on the machine front wall 5.

Both the tool plate 7, as well as the second plate or base plate 8 are each provided in their center with a recess 14 which extends around the wire guide 2, as in Fig. 1 is shown. The recesses 14 are in the two plates 7 and 8 of square shape with obliquely cut corners and lie in the initial rest position of the 2D cross table 6 on top of each other and form a common opening area through which the conveyed wire 3 via the wire guide 2 in the Working area of the machine 1 can be promoted unhindered.

How out Fig. 1 (or the other figures) is directly removed, are distributed around the recess 14 in the tool plate 7, several different tools attached, such a bending tool 15 with a rotatable bending head 16, further a wind finger 17, to which a plurality of winch grooves may be attached and finally a cutting tool 18. Of course, there could also be more or less tools arranged there. Each of the tools is mounted on the tool plate 7 so that it is fixed immovably in the direction of a feed movement to the wire guide 2 out.

Each tool may, if desired, be additionally provided with a drive, wherein Fig. 1 only one such further drive 19 for rotating the bending head 16 of the bending tool 15 is indicated.

A grid 20 with a plurality of holes is arranged on the tool plate 7 to allow easy mounting of tools to be attached thereto.

• Zunächst bestehen die eingesetzten Werkzeuge, wie etwa Fig. 2 sehr deutlich erkennen läßt, aus Werkzeughaltern 21, die am Bohrungsraster 20 eingesteckt sind und dort mittels Schrauben 22 verschraubt werden können.

The enlarged perspective front view of the FIGS. 2 to 4 makes the local conditions on the mechanical stage 6 particularly well recognizable in different working positions:

• First, there are the tools used, such as Fig. 2 can be seen very clearly from tool holders 21 which are plugged into the hole grid 20 and there can be screwed by means of screws 22.

The hole pattern 20 runs around the entire circumference of the recess 14, so that tools can be arbitrarily positioned in this grid.

The tool holders 21 can also be used e.g. be provided with an adjusting device 23, via which the position of the tool in question can be adjusted in the longitudinal direction of the wire 3 in order to achieve the best possible alignment with the wire guide 2.

• Der Draht 3 wird vom (in den Figuren verdeckten) Drahteinzug von der Rückseite her durch die Drahtführung 2 nach vorne in den Arbeitsbereich der Maschine 1 gefördert, wo er durch die Werkzeuge 15, 17 und 18 nacheinander bearbeitet bzw. umgeformt wird.

The illustrated leg spring machine 1 now works as follows:

• The wire 3 is conveyed from the (hidden in the figures) wire retraction from the back through the wire guide 2 forward in the working area of the machine 1, where it is processed by the tools 15, 17 and 18 successively or reshaped.

In order to position the wire guide 2 optimally to the tools 15, 17 and 18 used, it can be rotated about the longitudinal axis of the wire 3.

By actuating the drives 10 and 13 of the 2D cross table 6, the respectively required tool can be brought into engagement with the wire 3.

Fig. 2 shows the state in which by the method of the tool plate 7 (the movement of which results overall by the superposition of their relative movement to the base plate 8 and their relative movement to the machine front wall 5) of the bending head 16 of the bending tool 15 moved up to the outlet of the wire guide 2 and with the wire 3 is engaged. Then either the further drive 19 for the bending head 16 of the bending tool 5 (for a bending operation) or the wire retraction (for a winch) is actuated.

In this way, in succession, different of the mounted tools can be brought into the assigned working position by corresponding traversing movements of the tool plate 7 of the 2D cross table 6, and thus also a sequence of different machining operations on the wire 3 can be performed as desired.

As a last operation, the cutting tool 18 is moved up to the wire 3 and moved so that it shears the wire 3 on the wire guide 2.

• In Fig. 2 ist das Biegewerkzeug an den Draht 3 herangefahren und bewirkt eine entsprechende Biegeformung des laufend angeförderten Drahtes 3.

In the Fig. 2 to 4 now different work steps are shown:

• In Fig. 2 the bending tool has moved up to the wire 3 and causes a corresponding bending deformation of the continuously conveyed wire 3.

Fig. 3 shows a position in which the wind finger 17 is brought into working position and the conveyed wire 3 is wound.

In Fig. 4 Finally, a position is shown in which the cutting tool 18 has just moved up to the wire guide 2, wherein the movement of the cutting tool 18 continues to run until the wire 3 is finally sheared off on the wire guide 2.

About the two drives 10 and 13 of the 2D cross table 6 all attached to the tool plate 7 tools 15, 17 and 18 are moved together: they need for their transfer to the working position no separate, separate drives.

If further degrees of freedom are necessary, however, further drives can be attached to the tools without any problems.

For the production of simple springs, in which e.g. only wound and then separated, it is usually sufficient to move only along a traverse axis of the cross table 6, the tool plate 7 and / or the second plate 6.

Instead of using a rotatable feeder, the leg spring machine 1 according to the invention also has the possibility of rotatably forming the entire tool unit.

Instead of the 2D cross table 6, a 3D cross table could also be used which allows additional movement of the tool plate 7 and thus the tools mounted on it in the wire conveying direction.

Finally, it could also be provided to form the entire tool unit (2D cross table with the mounted tools) pivotable about an axis perpendicular to the wire 3, in which case the tools 15, 17, 18 would no longer act vertically on the wire 3.

Also, a tendency of the axes x, y at a little less than or slightly more than 45 ° to the vertical vertical axis HH of the machine 1, for example below 40 ° or below 50 °, also leads to a still relatively vibration-free operation of the overall machine.

Instead of the attachment of the cutting tool 18 on the tool plate 7 but the former can also be supported by means of a (not shown in the figures) support arm directly on the base frame 4 and on the end plate 5 to the 2D-stage from the introduction and Absorption of considerable cutting forces to relieve. In this case, however, then the support arm in turn must be movable relative to the machine frame to effect its delivery to the execution of the cut on the wire 3. Alternatively, the support arm could be immobile and the cutting tool 18 provided with its own Zustellantrieb sitting on the arm.

• Um dem Anwender eine möglichst optimale Einstellung an der Schenkelfedermaschine 1 zu ermöglichen, sollte dieser nur die gewünschte Federgeometrie am Eingabebildschirm der Bediensoftware erstellen. Daraus berechnet dann die Software die jeweiligen idealen Werkzeugpositionen, die dem Anwender zur Einrichtung der Maschine anschließend ausgegeben werden. Nach dem Einrichten der Maschine müssen die Positionen vom Bediener bestätigt oder abgeändert werden, ehe die Software das eigentliche Fertigungsprogramm erzeugt. Es ist auch denkbar, eine automatische Abfrage der Werkzeugpositionen vorzusehen.

To set up the leg spring machine 1 according to the invention, it is recommended to deposit the following method in the software of the machine control:

• In order to allow the user the best possible setting on the leg spring machine 1, this should only create the desired spring geometry on the input screen of the operating software. The software then calculates the respective ideal tool positions, which are then output to the user for setting up the machine. After setting up the machine, the positions must be confirmed or changed by the operator before the software generates the actual production program. It is also conceivable to provide an automatic query of the tool positions.

The control of the manufacturing process is then ultimately due to the set program via a central process control device.

Claims (14)

Wire-forming machine (1), in particular spring-bending or spring-winding machine, with a machine frame (4), a wire feed and a wire guide (2) for conveying the supplied wire (3) into a working area of the machine (1) in which the wire passes a tool or a plurality of tools (15, 17, 18) is processed and / or reshaped, for which purpose each tool (15, 17, 18) is moved from a starting position remote from the wire (3) via a feed movement into a working position relative to the wire (3 ) and the tools (15, 17, 18) can be moved around a tool plate (7) provided on the machine frame (4) around a recess (14) provided therein, through which the wire (3) passes the working area of the machine (3). 1), are arranged, wherein further each tool (15, 17, 18) on the tool plate (7) in the direction of its feed movement relative to the tool plate (7) is immovably fixed, its feed movement in his Arbeitsst is made only by a corresponding movement of the tool plate (7), and the tool plate (7) on a with one of the recess (14) of the tool plate (7) corresponding recess (14) provided second plate (16) is seated, wherein the tool plate (7) along a first direction (x) on the second plate (16) and these along a second, to the first direction (x) perpendicular direction (y) on the machine frame (4) are movable, characterized in that both directions ( x, y) are each arranged at an inclination of 45 ° to the vertical vertical axis (HH) of the wire forming machine (1). Wire-forming machine according to one of Claims 1, characterized in that the longitudinal axes of all tools (16, 17, 18) mounted on the tool plate (7) are likewise arranged at an angle of 45 ° to the vertical vertical axis (HH) of the machine (1). Wire-forming machine according to Claim 1 or 2, characterized in that the tool plate (7) and the second plate (8) are each displaceably guided on two mutually parallel linear guide strips (9; Wire-forming machine according to one of Claims 1 to 3, characterized in that the tool plate (7) and the second plate (8) form a 2D cross table (6). Wire-forming machine according to one of Claims 1 to 4, characterized in that the drive (10) for moving the tool plate (7) is also mounted on the second plate (8). Wire-forming machine according to one of claims 1 to 5, characterized in that tools (15, 17) mounted on the tool plate (7) are adjustable perpendicular thereto. Wire-forming machine according to one of claims 1 to 6, characterized in that tools (15) on the tool plate (7) are provided with an additional rotary drive (19). Wire-forming machine according to one of claims 1 to 7, characterized in that the tool plate (7) and the second plate (8) are parts of a 3D cross-table and together are still movable in a direction parallel to the wire direction. Wire-forming machine according to one of claims 1 to 8, characterized in that the tool plate (7) with the tools (15, 17, 18) attached to it is still pivotable about an axis perpendicular to the wire conveying direction. Wire-forming machine according to one of claims 1 to 9, characterized in that the recess (14) of the tool plate (7) in each relative position of the tool plate (7) and second plate (8) fully inside of the recess (14) of the second plate (7) 8) specified area lies. Wire-forming machine according to one of claims 1 to 10, characterized in that in the recess (14) of the tool plate (7) a cover plate is mounted, by means of which at the edge of the recess (14) circumferentially the space between the tool plate (7) and machine frame (4 ) is covered. Wire-forming machine according to one of Claims 1 to 11, characterized in that the width of the gaps between the tool plate (7) and the second plate (6) and between the latter and the machine frame (4) is in each case only in a range from 0.8 to 1 , 3 mm. Wire-forming machine according to one of claims 1 to 12, characterized in that the recess (14) in the second plate (6) is formed substantially square. Wire-forming machine according to one of Claims 1 to 13, characterized in that a tool (18) is designed as a cutting blade and is mounted on the machine frame (4) via a support arm.

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