EP1200213B1 - Device for producing a lifting and lowering movement - Google Patents

Abstract

An apparatus for producing a lifting and lowering movement for lifting and lowering transverse transporting tongs of a forming machine includes a rotatable control shaft on which a control cam, a counter cam and a spring element cam are fitted. A pivotably mounted double lever has a control roller arm, a counter roller arm and a drive output arm. A control roller, rolling on the control cam, is rotatably arranged on the control roller arm and a counter roller, rolling on the counter cam, is rotatably arranged on the counter roller arm. The control cam and the counter cam act on the double lever in opposite directions of rotation. On the spring element cam there rolls a spring element roller arranged on a spring element lever. Arranged on the spring element lever is a spring element, which acts on the double lever in the same direction of rotation as the counter roller.

Description

The present invention relates to a device to generate a lifting and lowering movement for lifting and Lowering cross transport tongs of a metal forming machine, such as it is defined in the preamble of independent claim 1 is. The device according to the invention is both in Hot forming machines can also be used in cold forming machines.

In forming machines, the workpieces are often Cross transport tongs from one forming station across to the next transported and the empty cross transport tongs afterwards transferred back to the starting position. Out from WO 98/14289 it is known, for example, the transverse transport tongs via a pliers box to a cross transport pipe to couple and by moving the cross transport tube in the longitudinal direction of the pipe with the pliers box Cross transport pliers holding workpieces from the starting position to move to the release position. there the tongs box with a roller rolls on one ruler attached to the anvil. To return the empty Cross transport tongs after releasing the workpieces the tongs box with the cross transport tongs by turning of the cross transport tube lifted and pushed back of the cross transport pipe in the longitudinal direction of the pipe and lowering again of the pliers box is transferred to the starting position. The lifting of the cross transport tongs during the return transfer serves to avoid the forming tools.

The cross transport tongs are raised and lowered via turning one a control roller arm and a counter roller arm having double lever by means of a control curve and a counter curve on a rotatable control shaft are attached and on the double lever in opposite Direction of rotation. For this are on the control roller arm a control roller rolling on the control cam and on the counter roller arm a counter roll rolling on the counter curve rotatably arranged.

That the cross transport tongs when moving from the starting position not be lifted into the release position and the pliers box rolls on the ruler has the disadvantage that if the ruler is dirty or the plier box roller is dirty an irregular movement occurs and the Plier box in the release position and / or starting position is possibly placed inaccurately. In addition, at on the ruler pliers box vibrations or by overdetermination due to inaccuracies or Contamination of the control curve, the counter curve, the double lever, of the pliers box etc. which may cause deformation Tensions occur. Another disadvantage consists of the pliers box being returned to the starting position is placed relatively hard.

In the forming machines described in GB-B-730 321 are the cross transport tongs when transferring from the Starting position in the release position as well Transfer from the release position to the starting position raised and lowered again to rotate the cross feed tongs to enable during the transverse shift. The Raising and lowering is done by turning a control roller arm and a double lever having a counter roller arm by means of a control curve and a counter curve, the act on the double lever in the opposite direction of rotation. The control curve and the counter curve rotate here not, but are moved back and forth. On the control roller arm is a control roller rolling on the cam and on the counter roller arm one that rolls on the counter curve Counter roller rotatably arranged. A fixed spring presses the steering roller arm with the steering roller permanently to the control curve.

By lifting the cross transport tongs both during transfer from the starting position to the release position as also when transferring from the release position to the starting position will be when rolling the pliers box Problems that may arise on the anvil or ruler avoided, but the others above regarding the the WO 98/14289 known transverse transport and lifting device Disadvantages mentioned remain.

Given the disadvantages of the previously known, described above Transverse and lifting devices is the Invention based on the following object. Can be created a device for generating a lifting and lowering movement for lifting and lowering cross transport tongs at the beginning mentioned way with which the cross transport tongs to desired Can be raised and lowered again in particular a gentle lowering into the fully lowered Position possible and over-determination over wide areas and vibrations should be avoidable.

This object is achieved by the device according to the invention solved as defined in independent claim 1 is. Preferred design variants result from the dependent claims.

The device according to the invention for producing a lifting and Lowering movement for lifting and lowering cross transport tongs The essence of a metal forming machine is as follows: There is a control cam on a movable cam bracket and attached a counter curve. A rotatably mounted Double lever has a control roller arm and a counter roller arm on, one on the control roller arm Control cam rolling control roller and on the counter roller arm a counter roller rolling on the counter curve is rotatably arranged are and the control curve and the counter curve on the Double levers work in the opposite direction of rotation. The The device also comprises a movable spring element curve, on the one arranged on a spring element lever Rolls spring element roll, and one on the spring element lever arranged spring element that on the double lever in the same Direction of rotation as the counter roller acts.

Because in addition to the control curve, the opposite curve and the double lever a spring element curve and a spring element lever can be present with a spring element the lifting and lowering movements alternately on the one hand through the control curve and the opposite curve and on the other controlled by the control curve and the spring element curve become. A control by the control curve and the spring element curve is particularly low in the area Position of the cross transport tongs attached to one hand an almost speedless, i.e. for example, soft touchdown a tongs box carrying the cross transport tongs to ensure on the anvil or a plate and on the other hand to pretension the cross transport tongs downwards, so that neither vibrations nor one occur There is overdetermination, like that in simultaneous Action of the control curve and the counter curve on the double lever and the anvil or plate on the pliers box would be the case. Control by the control curve and the The opposite curve, however, is in medium and higher lifting ranges for safe and precise guidance of the relatively heavy Plier box with the cross transport pliers makes sense.

The spring element curve on the movable cam carrier is advantageous and the double lever and the spring element lever rotatably attached to a common axis. The device can be built relatively easily and the spring element doesn't have to make more path than necessary.

In a preferred embodiment variant, the spring element curve has and the opposite curve has the same curve shape and are designed as a single curve. The device is easier and cheaper to manufacture.

In another preferred embodiment variant, the Spring element curve formed separately from the opposite curve. This enables a suitable variation of the spring force by shaping the spring element curve accordingly.

Preferably, the control curve, the counter curve and the Spring element curve shaped so that in the completely lowered Position of the cross transport tongs the spring element roller abuts the spring element curve and the spring element on the double lever and the cross transport tongs down exerting pressing torque while the control roller of the control curve and the counter roller lifted off the counter curve are. This will work in the fully lowered position only the spring element curve and the anvil on top of it Forceps box in a prestressing and overdetermination very exclusive way.

Fig. 1 -

eine schematische Darstellung einer erfindungsgemässen Vorrichtung mit einem Zangenkasten in ganz gesenkter Stellung;

Fig. 2 -

die Vorrichtung von Fig. 1 mit dem Zangenkasten in einer niederen Hebestellung;

Fig. 3 -

die Vorrichtung von Fig. 1 mit dem Zangenkasten in einer hohen Hebestellung;

Fig. 4 -

einen ersten möglichen Weg des Zangenkastens in der Umformmaschine; und

Fig. 5 -

einen zweiten möglichen Weg des Zangenkastens in der Umformmaschine.

The device according to the invention for generating a lifting and lowering movement for lifting and lowering transverse transport tongs of a forming machine is described in more detail below with reference to the accompanying drawings using an exemplary embodiment. Show it:

Fig. 1 -

a schematic representation of a device according to the invention with a pliers box in the fully lowered position;

Fig. 2 -

the device of Figure 1 with the pliers box in a lower lifting position.

Fig. 3 -

the device of Figure 1 with the pliers box in a high lifting position.

Fig. 4 -

a first possible way of the pliers box in the forming machine; and

Fig. 5 -

a second possible way of the pliers box in the forming machine.

Figure 1

In the illustrated embodiment are on a movable Cam carrier in the form of a control shaft 1 a control curve 2, a counter curve 3 and a spring element curve 4 non-rotatably attached. The control shaft 1 is in the direction of Arrow A is rotatably mounted on the machine body 11 and is driven by an unsigned engine. Likewise attached to the machine body 11 is a control shaft 1 parallel axis 7, on which a double lever 5 and a spring element lever 6 are pivoted. The double lever 5 comprises a control roller arm 52, a counter roller arm 53 and an output arm 51. At the free end of the control roller arm 52, a control roller 54 is rotatably mounted on the control cam 2 rolls while at the free end of the counter roller arm 53 a counter roller 55 is rotatably mounted, that rolls on the opposite curve 3. Under rolling is in Framework of the present description and claims did not understand that the corresponding role continuously is in contact with the associated curve and continuous rolls on this one, but that it at least temporarily touches the curve and then rolls on it.

The control roller arm 52 and the counter roller arm 53 are of this type arranged that the control roller 54 and the counter roller 55 on different sides of the through the control shaft 1 and axis 7 going plane. This has to Consequence that the control curve 2 and the counter curve 3 on the Double lever 5 act in the opposite direction of rotation.

The spring element lever 6 has one at its free end rotatably mounted spring element roller 62 on the spring element curve 4 rolls. Between the spring element lever 6 and the output arm 51 of the double lever 5 is a spring element 61 arranged, which is drawn here as a spring. In in practice, a bellows cylinder is preferably used, in principle, however, any other spring elements are conceivable, which, depending on the design of the double lever 5, also on the counter roller arm 53 or for example as tension springs on the control roller arm 52 can start. The spring element curve 4 and the spring element 61 act on the double lever 5 in the same Direction of rotation as the opposite curve 3.

The free end of the driven arm 51 is here via a ball joint 86 connected to one end of a coupling rod 81, the other end of which is articulated with a pliers box 82 is connected to the pliers cassettes 83 with not shown Cross transport tongs are attached. The pliers box 82 is fixed to a rotatable and longitudinally movable Machine body 11 mounted transverse transport tube 84 attached. By moving the cross transport tube 84 in its Longitudinal direction of the pliers box 82 and thus the Pliers cassettes 83 moved with the cross transport pliers be, the transverse displacement with a through the Control curve 2, counter curve 3 and spring element curve 4 controlled Lifting and lowering movement is coordinated.

In the illustrated fully lowered position of the cross transport tongs is the pliers box 82 on a plate 91 an anvil 9 supported. The spring element roller 62 lies on the spring element curve 4 while the control roller 54 and the counter roller 55 from the control curve 2 or counter curve 3 are lifted off. The spring element 61 presses the driven arm 51 of the double lever 5 upwards, so that the coupling rod 81 and the associated end of the pliers box 82 also upwards and consequently the pliers cassettes 83 supporting side of the pliers box 82 pressed down become. The pliers box 82 is therefore below a certain Bias on the plate 91. Because only the spring element curve 4, but neither the control curve 2 nor the opposite curve 3 are effective, are possibly generating deformations Tension between the anvil 9 and the control curve 2 or the opposite curve 3 due to overdetermination locked out. As for the spring element curve 4, so it only acts as a spring via the spring element 61, so that there is no overdetermination in this regard either.

The following definition applies to the entire further description. Are in a figure for the sake of graphic clarity Reference numerals included, but in the immediately associated Descriptive text not explained, so is on their Mention in previous figure descriptions reference taken.

Figure 2

Starting from the position shown in Fig. 1 Control shaft 1 rotated in the direction of arrow A, so via the control roller 54 of the control roller arm 52 by a Hump 21 of the control cam 2 pressed outwards, resulting in The consequence is that the double lever 5 in the same direction of rotation how the control shaft 1 is rotated. This will make the coupling rod 81 and the associated end of the pliers box 82 pulled down and the pliers cassettes 83 with the cross transport tongs carrying the end of the tongs box 82 raised to a lower lifting position. The opposite curve 3 is still inactive while the spring element 61 has been compressed and thus on the output arm 51 of the Double lever 5 exerts a greater torque.

If you turn the control shaft 1 even further, the control roller arrives 54 into a recess 22, where they are no longer on the Control curve 2 is present. The double lever 5 is in Control shaft 1 turned in the opposite direction of rotation, until the fully lowered position of the cross transport tongs is reached in which of the curves only the Spring element curve 4 is effective via the spring element 61. The pliers box 82 is placed on the plate 91 almost without speed.

While lifting the cross transport tongs into the lower one Lifting position and the subsequent lowering into the the cross transport tube 84 and thus the pliers box 82 and the pliers cassettes 83 with the cross feed tongs moved in the direction of arrow B. In this way, workpieces can be transported using the cross transport tongs transported from one forming station to the next become.

Figure 3

One rotates after the recess 22 reaches the control roller 54 has, the control shaft 1 in the direction of the arrow A, the control roller arm 52 becomes the control roller 54 pressed outwards by a hump 23 of the control cam 2, with the result that the double lever 5 in the same Direction of rotation as the control shaft 1 is rotated. There the hump 23 is much larger than the hump 21, the double lever 5 is rotated a lot more and the cross transport tongs raised to a high lifting position. From one the counter roll comes at a certain point during the lifting 55 to the opposite curve 3 and the double lever 5 and thus finally the cross transport tongs are from the Control curve 2 and the opposite curve 3 together safely and precisely managed.

If you turn the control shaft 1 even further, the hump 23 turned away under the control roller 54 and it will eventually again reached the position shown in Fig. 1. The double lever 5 is opposite to the control shaft 1 Direction of rotation turned back until the completely lowered position of the cross transport tongs reached is in which of the curves only the spring element curve 4 the spring element 61 is effective because the counter roller 55 of the opposite curve 3 at some point during and the control roller 54 from the cam 2 shortly before the end the lowering is lifted off. Settling also takes place here of the pliers box 82 on the plate 91 almost without speed.

While lifting the cross transport tongs into the high lifting position and then lowering into the the cross transport tube 84 and thus the pliers box 82 and the pliers cassettes 83 with the empty cross feed tongs pushed back in the direction of arrow C. The cross transport tongs arrive again to the starting position, where they can grip new workpieces.

Figure 4

The movement explained in connection with FIGS. 1 to 3 of the pliers box 82 is shown graphically here, whereby the movement takes place in the direction of the drawn arrows. At point P the pliers box 82 is in the completely lowered position according to Fig. 1. Then he with simultaneous transverse shift from point P to Point Q raised to the lower lifting position shown in FIG. 2 and lowered back into the fully lowered position. The distance from pliers box 82 to plate 91 in the lower lifting position is relatively small, e.g. 1-3 mm, because only guaranteed must be that the pliers box 82 is not rests on the plate 91. While moving from the point P to point Q become workpieces from the cross transport tongs transported from one forming station to the next and there released by the cross transport tongs.

Then the pliers box 82 with the cross transport pliers while moving back from point Q to point P in the high lifting position shown in FIG. 3 and lowered back into the fully lowered position. The distance from pliers box 82 to plate 91 in the high lifting position is relatively large, e.g. about 50% of the length of the horizontal shift, because it must be ensured that the cross transport tongs do not touch the forming tools.

Figure 5

Alternatively, it can be useful to transport the workpieces not in the lower shown in FIGS. 2 and 4 Make lifting position, for example in the last forming station a slide for the removal of the formed Workpieces are present that are practical at a horizontal transverse displacement of the cross transport tongs is not can be optimally placed. An introduction is preferable of the pliers box 82 with the cross transport pliers down the point Q from above. In the advantageous shown here The pliers box 82 therefore moves along the path of movement in the direction of the arrow from the fully lowered position in Point P slowly increases to a middle lifting position and then lowers relatively quickly, preferably about three times as much as fast as the lifting movement, in the fully lowered position in point Q. The distance from the pliers box 82 to the plate 91 in the middle lifting position is preferably about Third of the distance from pliers box 82 to plate 91 in the high lifting position.

The return movement from point Q to point P is the same as for the variant shown in Fig. 4 by lifting in the high lifting position and lowering again into the fully lowered position Position.

• Die Übertragung der Hebe- und Senkbewegung vom Doppelhebel 5 auf die Quertransportzangen kann praktisch auf beliebig viele andere Arten erfolgen. Insbesondere könnte der Doppelhebel 5 direkt auf den Zangenkasten 82 wirken und die Quertransportzangen könnten direkt und nicht über Zangenkassetten 83 am Zangenkasten 82 befestigt sein.
• Für die Lagerung des Doppelhebels 5 und des Federelementhebels 6 können verschiedene Achsen vorgesehen sein, die nicht parallel zu sein brauchen. Auch könnten die Achsen z.B. rechtwinklig zum Quertransportrohr 84 angeordnet werden.
• Die Hebe- und Senkbewegungen können beispielsweise auch auf eine Zangenwippe, welche den Zangenkasten mit dem Quertransportantrieb trägt, eingeleitet werden.
• Als bewegbarer Kurventräger kann anstelle der rotierbaren Steuerwelle 1 z.B. eine drehoszillierbare Steuerwelle oder ein linearoszillierbarer Steuerschieber etc. vorgesehen sein.

Further variations on the above-described devices according to the invention for generating a lifting and lowering movement for lifting and lowering transverse transport tongs of a forming machine and on the movement paths explained are feasible. Here are also explicitly mentioned:

• The transfer of the lifting and lowering movement from the double lever 5 to the cross transport tongs can be done practically in any number of other ways. In particular, the double lever 5 could act directly on the pliers box 82 and the transverse transport pliers could be attached directly to the pliers box 82 and not via plier cassettes 83.
• For the mounting of the double lever 5 and the spring element lever 6, different axes can be provided, which need not be parallel. The axes could also be arranged, for example, at right angles to the transverse transport tube 84.
• The lifting and lowering movements can, for example, also be initiated on a pliers rocker which carries the pliers box with the transverse transport drive.
• Instead of the rotatable control shaft 1, a rotatable control shaft or a linearly oscillatable control slide etc. can be provided as the movable cam carrier.

Claims (11)

1. An apparatus for producing a lifting and lowering movement for lifting and lowering transverse transporting tongs of a forming machine, having a movable cam carrier (1) on which a control cam (2) and a counter cam (3) are fitted, and having a pivotably mounted double lever (5) which has a control roller arm (52) and a counter roller arm (53), with a control roller (54), rolling on the control cam (2), being rotatably arranged on the control roller arm (52) and a counter roller (55), rolling on the counter cam (3), being rotatably arranged on the counter roller arm (53), and the control cam (2) and the counter cam (3) acting on the double lever (5) in opposite directions of rotation, characterized in that said apparatus also has a movable spring element cam (4), on which there rolls a spring element roller (62) arranged on a spring element lever (6), and a spring element (61), which is arranged on the spring element lever (6) and acts on the double lever (5) in the same direction of rotation as the counter roller (55).
2. The apparatus as claimed in claim 1, characterized in that the spring element cam (4) is likewise fitted on the movable cam carrier (1) and the double lever (5) and the spring element lever (6) are preferably fitted rotatably on a common spindle (7).
3. The apparatus as claimed in claim 2, characterized in that the spring element cam (4) and the counter cam (3) have the same curved shape and are preferably formed as a single cam.
4. The apparatus as claimed in one of claims 1 to 3, characterized in that a pivoting of the double lever (5) effected by the control cam (2) lifts the transverse transporting tongs, while a pivoting of the double lever (5) effected by the counter cam (3) or the spring element cam (4) lowers it.
5. The apparatus as claimed in one of claims 1 to 4, characterized in that the control cam (2), the counter cam (3) and the spring element cam (4) are shaped in such a way that, in the fully lowered position of the transverse transporting tongs, the spring element roller (62) bears against the spring element cam (4) and the spring element (61) exerts on the double lever (5) a torque pressing the transverse transporting tongs downward, while the control roller (54) is lifted off the control cam (2) and the counter roller (55) is lifted off the counter cam (3).
6. The apparatus as claimed in one of claims 1 to 5, characterized in that the control cam (2), the counter cam (3) and the spring element cam (4) are shaped in such a way that the transverse transporting tongs can be lifted by the control cam (2) against the torque exerted by the spring element (61) on the double lever (5) into a low lifting position, while the counter roller (55) is lifted off the counter cam (3).
7. The apparatus as claimed in one of claims 1 to 6, characterized in that the control cam (2), the counter cam (3) and the spring element cam (4) are shaped in such a way that the transverse transporting tongs can be lowered by the control cam (2), supported by the torque exerted by the spring element (1) on the double lever (5), from a low lifting position into the fully lowered position, while the counter roller (55) is lifted off the counter cam (3).
8. The apparatus as claimed in one of claims 1 to 7, characterized in that the control cam (2), the counter cam (3) and the spring element cam (4) are shaped in such a way that the transverse transporting tongs can be lifted by the control cam (2) from the fully lowered position against the torque exerted by the spring element (61) on the double lever (5) in a slowly rising manner into a middle lifting position, while the counter roller (55) comes to bear against the counter cam (3), and can then be lowered into the fully lowered position quickly, preferably approximately three times as quickly in comparison with the lifting movement, while the counter roller (55) lifts off again from the counter cam (3), assisted by the torque exerted by the spring element (61) on the double lever (5).
9. The apparatus as claimed in one of claims 1 to 8, characterized in that the control cam (2), the counter cam (3) and the spring element cam (4) are shaped in such a way that the transverse transporting tongs can be lifted by the control cam (2) from the fully lowered position against the torque exerted by the spring element (61) on the double lever (5) into a high lifting position, while the counter roller (55) comes to bear against the counter cam (3), and can be lowered from this position into the fully lowered position again, while the counter roller (55) lifts off again from the counter cam (3), assisted by the torque exerted by the spring element (61) on the double lever (5).
10. The apparatus as claimed in claim 9, characterized in that the control cam (2), the counter cam (3) and the spring element cam (4) are shaped in such a way that, during a movement cycle of the movable cam carrier (1), the transverse transporting tongs are lifted from the fully lowered position into the low or middle lifting position, are lowered from this position into the fully lowered position, are lifted from this position into the high lifting position and, finally, are lowered from this position into the fully lowered position again.
11. The apparatus as claimed in one of claims 1 to 10, characterized in that the movable cam carrier is a rotatable control shaft (1).

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