EP2258494A1 - Bending device for rod-shaped workpieces - Google Patents

Abstract

The device (1) has a machine frame (2), at which a bending head (4) is attached, where the bending head is movable relative to the machine frame. A feeding- and adjusting unit (7) is provided upstream to the bending head for supplying a work-piece to a cutting device (6). The cutting device is movable in a supply direction of the work-piece. The cutting device is provided between the bending head and the unit, for cutting of the work-piece. The unit is movable in a supply direction of the work-piece independent of the cutting device.

Description

The invention relates to a bending device for rod-shaped workpieces, comprising a machine frame, on which a bending head movable relative to it is mounted with a bending mandrel, further comprising a feed device upstream of the bending head for feeding the workpieces thereto, and with a along the longitudinal center axis of the Workpieces movable, between bending head and feed device on the respective workpiece for performing a cut attachable cutting device.

In bending devices and in particular those for bending rod-shaped workpieces, it is generally desirable to have the largest possible bending clearance, thus z. As well as a sufficient space for turning a leg as long as possible of a bent part is available when bends greater than 90 ° must be made without parts of the bending machine thereby represent an interference contour.

From the DE 602 19 651 T2 (according to the EP 1 434 660 B1 ) a bending machine is known in which the bending head upstream of a feed device and two cutting devices are provided, one of which is attached to the frame of the feed device and can be moved with this in the direction of the longitudinal axis of the workpiece to be treated. Between the feed device and the bending head, a further, but stationary cutting device is attached, which, however, represents a significant interference contour when bending, if a long leg is to be bent by more than 90 °.

The arrangement of the FR 2602160 A1 comprises a feed device and a movable along the longitudinal center axis of the workpiece cutting device for producing cut-to-length workpieces for the bending machine. The bending machine itself consists of a gripping unit and a movable bending head (or two movable bending heads). Overall, this known bending system has a very large footprint. In addition, turns the bending head (bending heads) rotate around the workpiece and significantly restrict (limit) the available bending clearance. In addition, remains in the construction described there between cutting and bending head always a relatively long straight tail, which is also often undesirable.

The DE 601 03 632 T2 ( EP 1 272 293 B1 ) describes a bending machine with a movable along the longitudinal central axis of the workpieces bending nose, on whose side facing away from the bending head, a cutting device is attached, which can be moved with her. As a result of the length of the bending nose, however, this always leads to the fact that between the interface and the bending head again a very long straight tail of the workpiece is present, which is often undesirable.

A bending device of the type mentioned is from the DE 690 03 116 T2 ( EP 0 379 030 B1 ), in which both the feed device, as well as the bending unit can be raised and lowered. Even with this known bending machine remains between the interface and bending head a relatively long straight end of the workpiece, which also always between the feed unit and the bending head is always a very large distance, which can lead to difficulties especially when working very thin wires.

Proceeding from this, the invention aims at a bending device of the type mentioned in such a way that in her bends greater than 90 ° and long leg of the workpiece can be performed, for a sufficiently large bending space is available and which also allows bends, where only a relatively small, straight tail of the workpiece remains between interface and bending head and also the distance between the feed unit and bending head can be chosen to be particularly small.

According to the invention this is achieved in a bending machine of the type mentioned in that in addition to the cutting device and the feed device in the feed direction of the workpiece, regardless of the cutting device, can be moved.

In the bending machine according to the invention can thereby, that not only the cutting device, but also the upstream feeding device in the feed direction of the workpiece (and therefore also against the same) can be moved by driving the cutting unit and the feed unit of the bending head in a predetermined, of this maximum remote position can be spent, so that between the cutter and the bending head a lot of space to turn a long Leg of a bending part (workpiece) is available. By inventively provided movability of the feed device can be achieved that the cutting device can be moved away from the bending head particularly far away.

If workpieces are bent, in which it matters that only a relatively short straight end piece remains between bending head and cutter, which is desirable in many cases, so can the traversability of the cutter regardless of the feed device, the cutter very close to next move the bending head, without simultaneously a method of the feed device, such as from a remote from the bending head position would be required. If, in particular when processing thin wires, even the shortest possible distance between feed device and bending head is to be ensured in order to avoid undesired deformations in this area, then, even with the cutting device moved up to the bending head, the feed device can also be arranged in one moved very close to the bending head zoomed position.

Are cutting device and feed device z. B. in a position remote from the bending head, then given in the, the possibility that only for carrying out the cutting process (at the end of the bending process), the cutting device is moved up to the bending head and the feed device remains in its remote position from the bending head.

A particularly preferred embodiment of the bending device according to the invention is that the cutting device and the feed device are each movable on its own guideway, wherein the guideways are parallel to each other. In this embodiment, it is possible to allow by a suitable design of cutting device and feed device a particularly close approach of the feed device to the mandrel (in its foremost position), wherein of the movable cutting device, even in the foremost position between the bending head and feed device is interposed, even the portion that performs the cut, between the feed device and bending head and the rest of the cutting device including the motor for the process, inter alia, can be arranged laterally next to the feed device and parallel to this. In this way, it is possible to realize a particularly short straight end of the workpiece between the interface and bending head. It is advantageous if each guide track has two parallel guide rails, so that the storage and movability both in the cutting device, as well as in the feed device in each case on two parallel rails can take place, which contributes to a particularly low-vibration and stable overall construction.

In this case, the two guideways preferably consist of three parallel guide rails, each guide track consisting of the middle of these guide rails and one of the other two guide rails. In this embodiment, the two guideways can be realized with two parallel guide rails with a particularly low cost, the middle guide rail serves as a one-sided guide support for both the cutting device, as well as for the feed device.

In such an embodiment, a rack is preferably mounted directly adjacent to the middle guide bar, which is in each case with a mounted on the underside of the cutting device and on the underside of the feed device for carrying out the movement of both devices drive pinion engaged. The pinion of each of the two devices is driven by a motor which is arranged on the relevant device, with this movable.

A particularly preferred embodiment of the invention consists in the fact that the cutting device has a base plate, of which a support arm, which holds a movable cutting blade and a fixed counter blade for performing a cut, so protrudes into the feed axis of the respective conveyed workpiece, that from the Feed device coming workpiece between two knives runs. Since the two knives are mounted here on a protruding support arm, this creates the opportunity to protrude only this support arm with the knives in the feed axis of the workpiece and otherwise run out of the feed axis of the workpiece so that at a distance from the Feeding axis of the workpiece, the motor for driving the knives and the carriage and the motor for moving the cutting device may be attached. This allows a very close approach of the feed device to the bending head in its frontmost position, so that between it and the bending head only the width of the support arm is interposed with the two knives, which also results in particularly short straight end pieces of the workpiece after the cut.

Preferably, in this embodiment of the invention, the fixed counter knife is fixed to the support arm and the cutting blade, seen in the feed direction of the workpiece, mounted directly adjacent to the counter knife on a lever pivotally mounted on the arm pivoting about a parallel to the feed direction of the workpiece pivot axis for performing the cut is.

In a further advantageous embodiment of the bending device according to the invention, the bending head is mounted on the front end side of the machine frame, wherein he, also preferably, on transverse to the workpiece longitudinal direction on the front end side of the machine frame mounted arcuate guides is movable such that while the bending head is pivoted about the workpiece center axis , This means that these sheet guides are designed and mounted so that their center of curvature sits in the center axis of the workpiece, so that a lateral pivoting movement of the bending head on these sheet guides always leads to a pivoting of the bending head to the workpiece center.

A further advantageous embodiment of the invention further consists in that the feed device upstream is associated with a movable together with it straightening device (the term "upstream" or "downstream" is always used here in the sense of a reference to the transport direction of the supplied workpiece). As a result, the advantage is achieved that when returning the feed device the workpiece does not have to be pushed back by the straightening device upstream of it.

Advantageously, in the invention, the feed device comprises a plurality of feed roller pairs, which are fastened to a pivotable about the workpiece longitudinal axis bogie, wherein, preferably, the straightening unit is pivotally mounted together with the bogie of the feed device to the workpiece center axis. This gives the possibility to also produce three-dimensional bending parts.

Finally, it is in the invention also advantageous if the bending head is mounted in addition to its pivotability on the sheet guides in two mutually perpendicular directions and each perpendicular to the workpiece center axis movable.

Fig. 1

eine perspektivische Seitenansicht einer erfindungsgemäßen Biegevorrichtung;

Fig. 2

eine perspektivische Ansicht der Vorrichtung aus Fig. 1 (in gleicher Perspektive), jedoch mit einer zur Fig. 1 unterschiedlichen Verfahrstellung der Schneideinrichtung und der Vorschubeinrichtung;

Fig. 3

eine vergrößerte perspektivische Detaildarstellung von Biegekopf und Schneideinrichtung aus der Darstellung gemäß Fig. 1, sowie

Fig. 4, 5 und 6

jeweils eine Draufsicht auf eine erfindungsgemäße Biegemaschine mit unterschiedlichen Verfahrstellungen der Biege- und Vorschubeinrichtung, wobei Fig. 4 die Verfahrstellung der Fig. 2, Fig. 5 die Verfahrstellung ähnlich der aus Fig. 1 und Fig. 6 eine Verfahrstellung zeigt, bei welcher die Schneideinrichtung und die Vorschubeinrichtung in ihre maximal vom Biegekopf entfernte Verfahrstellung verbracht sind.

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

Fig. 1

a side perspective view of a bending device according to the invention;

Fig. 2

a perspective view of the device Fig. 1 (in the same perspective), but with a to Fig. 1 different displacement position of the cutting device and the feed device;

Fig. 3

an enlarged perspective detail view of bending head and cutting device from the illustration according to Fig. 1 , such as

4, 5 and 6

in each case a plan view of a bending machine according to the invention with different displacement positions of the bending and feed device, wherein Fig. 4 the displacement of the Fig. 2 . Fig. 5 the positioning is similar to the Fig. 1 and Fig. 6 shows a displacement position in which the cutting device and the feed device are moved to their maximum distance from the bending head travel position.

In the different figures of the drawing, the same parts are always assigned the same reference numerals.

The Fig. 1 and 2 show in a perspective view obliquely from above a bending machine 1, which comprises a machine frame 2, a mounted on the front side 3 of the same bending head 4 and a mounted on the top 5 of the machine frame 2 cutting device 6 and a feed and straightening device 7.

Here, the bending head 4 is mounted on the front side 3 of the frame 2, arcuately curved guide rails (sheet guides) 8, which are arranged and designed so that their center of curvature sits in the central axis 9 of the delivered workpiece. In order for a lateral pivoting of the bending head 4 along the sheet guides 8, a pivoting movement of the bending head 4 to the workpiece center, ie around the central axis 9 of the workpiece around, achieved (pivotal movement e , see. Fig. 1 ).

The bending head 4 is usually pre-positioned in a certain orientation and no longer pivoted during ongoing production. Nevertheless, there is the possibility of pivoting the bending head in direction e during the manufacturing process.

• So kann der Biegekopf 4 senkrecht (Richtung a ) oder auch parallel (Richtung b ) zur Biegeachse 10 des Biegekopfes 4 verfahren werden. Außerdem sind die Biegewerkzeuge 11 mit zwei konzentrischen Drehachsen versehen, wobei die erste den Biegedorn 12 und die zweite den Gegenhalter oder die Biegerolle 13 um die Biegeachse 10 dreht (vgl. auch Fig. 3).

The bending head 4 of the bending machine 1 is provided with four further axes of movement, two of which are perpendicular to each other and, each of them moreover, perpendicular to the central axis 9 of the workpiece:

• Thus, the bending head 4 can be moved vertically (direction a ) or also parallel (direction b ) to the bending axis 10 of the bending head 4. In addition, the bending tools 11 are provided with two concentric axes of rotation, wherein the first of the bending mandrel 12 and the second rotates the counter-holder or the bending roller 13 about the bending axis 10 (see also Fig. 3 ).

On the machine frame 2 5 three guide rails 14 and a rack 15 (see FIG. Fig. 3 ) are mounted parallel to each other and to the central axis 9 of the workpiece.

The front and middle guide rails 14 facing the viewer in the illustrations of the figures together form a guide track on which the housing 16 of the feed and straightening unit 7 is mounted in a removable manner ( Fig. 1 and 2 ). In this case, on the housing 16, the feed device 17 (which is also called "roll infeed") with several adjacently mounted feed roller pairs 18 and two mutually offset by 90 ° straightening devices 19 attached.

The first drive 28 is used to move the feed and straightening unit 7 on the guide rails 14 in the feed direction c, the second drive allows the rotation of a bogie of the feed device 17, on the the feed roller pairs 18 are fixed (and thus also a rotation of the clamped between the feed roller pairs 18 workpiece) about the central axis 9 of the workpiece, and the third drive actuates the feed rollers 18 so that they move the workpiece in the direction of its longitudinal or central axis 9.

The holder 20 of the straightening devices 19 is attached to the bogie of the feed device 17 and is rotatable with this about the central axis 9 of the workpiece. The first drive 28 is connected via a pinion with the attached to the machine housing 2 rack 15 into engagement, whereby, depending on which direction the first drive 28 acts, a corresponding method of the feed and straightening unit 7 in the direction c can take place.

The middle and the rear guide rail 14 together form a second guide track, on which, likewise in the direction c, a base plate 21 of the cutting device 10 is movably seated. From this base plate 21 projects from a solid support arm 22 with an inserted, fixed counter blade 23 in the central axis 9 (longitudinal axis) of the workpiece. On the support arm 22, a lever 24 with a cutting blade 25 inserted on it is rotatably mounted about a pivot axis 26 (movement d ), wherein the pivot axis 26 is parallel to the central axis 9 of the workpiece (see. Fig. 3 ).

On the base plate 21 of the cutting device 6, in turn, two drives are mounted: The first drive is via a (not shown) crank and slide guide with the pivotable lever 24 into engagement. By the operation of this drive, the lever 24 is pivoted relative to the support arm 22 and thereby separates the running between the counter blade 23 and the cutting blade 25 workpiece.

The second drive 27, which is provided on the base plate 21, engages the rack 15 via a pinion (again not shown) and thus enables a method or positioning of the cutting device 6 along the feed direction c (cf. Fig. 3 ).

Fig. 1 now shows the bending machine 1, in which the cutter 6 is moved fairly far in the direction of the bending head 4, but is still not quite in its forward traversing position, while the feed and straightening unit 7 at a relatively long distance from the bending head 4th located.

In the presentation of Fig. 2 however, the cutting device 6 is moved to its maximum forward position, in which the cutting blade 25 and the counter blade 23 are located immediately in front of the bending head 4, and also the feed and straightening unit 7 are in their foremost, ie the bending head 4 most approximate position method in which the housing 16 of the feed device 17 is very close to the base plate 21 of the cutter 6, as shown in the plan view Fig. 4 (with the same position) shows.

Fig. 5 shows a plan view of the bending machine 1 in a position in which the cutting device 6 is again in its forwardmost travel position, but the feed device is in a position remote from the bending head 4 position. The orientation of the bending head 4 is as they are in Fig. 2 is shown.

The representations of the Fig. 2 and 4 let recognize that here only a very short straight end leg is generated on the workpiece at a section of the workpiece, because the interface is located immediately in front of the bending head 4. On the other hand, however, it can also be seen from both figures that here the cutting device 6 and the advancing and straightening unit 7 represent a very considerable interference contour when bends greater than 90 ° but with a long end leg have to be bent.

• Die Fig. 6 zeigt dabei die hinterste, d. h. maximal vom Biegekopf 4 entfernte Stellung der Schneideinrichtung 6 und der Vorschub- und Richteinheit 7, wobei nunmehr zwischen der Schneideinrichtung 6 (und der Vorschub- und Richteinheit 7) und dem Biegekopf 4 sehr viel Platz zum Umschlagen eines langen Schenkels eines Biegeteiles zur Verfügung steht.

To allow such bends, the cutting device 6 and the feed and straightening unit 7 (independently of each other) can be moved in a position far away from the bending head 4 along the guide rails 14, as these in the plan view of Fig. 6 is shown:

• The Fig. 6 shows the rearmost, ie the maximum distance from the bending head 4 position of the cutting device 6 and the feed and straightening unit 7, now now between the cutter 6 (and the feed and straightening unit 7) and the bending head 4 very much space to turn a long leg a bent part is available.

In the presentation of Fig. 5 is the feed and straightening unit 7 by a certain distance to the rear, ie away from the bending head, process, the cutting device 6 is, however, just in its foremost cutting position to perform the cut.

When bending an attempt is made to keep the feeder (feed and straightening unit 7) and the cutter 6 as possible in a forward position. But if a long leg must be bent by more than 90 °, then the cutting device 6 and the feed and straightening unit 7 to the rear in the in Fig. 6 shown position. However, so that the workpiece does not move with the feed and straightening unit 7 to the rear, when it is moved away from the bending head 4, the device is controlled so that the workpiece is fed over the feed roller pairs 18 at the same speed forward, with the feed - And straightening unit 7 is moved away from the bending head 4, whereby the workpiece is stationary relative to the bending head 4. To separate the workpiece but then the cutter 6 is moved forward again.

In the Fig. 1 and 2 the orientation of the bending head 4 is carried out differently relative to the machine frame 2: While in Fig. 2 the bending head 4 is pivoted so that the bending axis 10 is exactly vertical, in contrast, the position of the bending head 4 in Fig. 1 by the process of the same laterally pivoted along the arcuately curved guide rails 8 something.

The orientation of the bending head 4 takes place, depending on the part to be manufactured, quite different: A tilted bending head 4, as in principle in Fig. 1 shown, allows dropping the workpiece to be machined after bending; in a vertical bending head 4, as in Fig. 2 is shown, the bending part can be removed from the bending table with grippers.

With regard to the illustrated embodiment of the bending machine 1 it should be noted that the rotational movement of the feed and straightening unit 7 around the central axis 9 of the workpiece around is not absolutely necessary; Just as well, the bending head 4 could be pivoted about the workpiece or it could also be produced only two-dimensional bending parts.

Similarly, other embodiments than the drive variant shown for the feed of the cutting device 6 and the feed and straightening unit 7 could be used, for. B. via a spindle drive, belt drive, etc., although then about a spindle drive for each of the two devices 6 and 7, a different drive is provided.

It is also possible to use a different number of guide rails 14, z. B. only two or four.

Similarly, for straightening with straighteners 19 also z. As rotating directional wings are used, which allow a better straightness of the workpiece. Furthermore, it is also known, by pivoting or moving different straightening units into engagement and out of engagement with the workpiece to bring (rotating straightening / Rollenrichten, small wire diameter / large wire diameter).

Equally, the use of a guide wheel (spill) could be provided at the rear end of the straightening unit, which reduces the rotation of the workpiece.

Claims (13)

Bending device (1) for rod-shaped workpieces, comprising a machine frame (2) on which a bending head (4) movable relative to it is mounted with a bending mandrel (12), further comprising a feed device (7) upstream of the bending head (4) for feeding the workpieces on these and with a movable in the feed direction of the workpieces, between the bending head (4) and feed device (7) on the respective workpiece for cutting the same attachable cutting device (6), characterized in that in addition to the cutting device (6) and the feed device (7 ) in the feed direction of the workpiece, independently of the cutting device (6), is movable. Bending device (1) according to claim 1, characterized in that the cutting device (6) and feed device (7) are each movable on a separate guide track, wherein the guide tracks are parallel to each other. Bending device (1) according to claim 2, characterized in that each guide track has two parallel guide rails (14). Bending device (1) according to claim 3, characterized in that the two guide tracks comprise three parallel guide rails (14), each guide track consisting of the middle guide rail (14) and one of the two other guide rails (14). Bending device (1) according to claim 4, characterized in that directly adjacent to the central guide strip (14) a rack (15) is mounted, each with one on the underside of the cutting device (6) and the feed device (7) for carrying out the movement both devices mounted drive pinion is engaged. Bending device (1) according to one of claims 1 to 5, characterized in that the cutting device (6) has a base plate (21) from which a support arm (22), which a movable cutting blade (25) and a fixed counter blade (23) holds, so protrudes into the feed axis (9) of each conveyed workpiece, that from the feed device (7) coming workpiece between the two blades (23, 25). Bending device (1) according to claim 6, characterized in that the fixed counter blade (23) is fixed on the support arm (22) and the cutting blade (25), viewed in the feed direction of the workpiece, immediately adjacent to the counter blade (23) on a support arm (23). 22) pivotally mounted lever (24) is seated, which is pivotable about the execution of the cut about a parallel to the feed direction of the workpiece pivot axis (26). Bending device (1) according to one of claims 1 to 7, characterized in that the bending head (4) on the front end face (3) of the machine frame (2) is mounted. Bending device (1) according to Claim 8, characterized in that the bending head (4) can be moved in such a manner on transversely to the workpiece longitudinal direction on the front end side (3) of the machine frame (2) arcuate guides (8), that thereby the bending head (4) is pivoted about the workpiece central axis (9). Bending device (1) according to one of claims 1 to 9, characterized in that the feed device (7) upstream of a movable together with it straightening device (19) is associated. Bending device (1) according to one of claims 1 to 10, characterized in that the feed device (7) comprises a plurality of feed roller pairs (18) which are fastened to a bogie pivotable about the workpiece longitudinal axis (9). Bending device (1) according to claim 11, characterized in that the straightening unit (19) is pivotally mounted together with the bogie of the feed device (7) about the workpiece central axis (9). Bending device (1) according to one of Claims 1 to 12, characterized in that the bending head (4) can be moved in two directions (a, b) which are perpendicular to one another and perpendicular to the workpiece central axis (9).

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