EP1071528B1 - Multistage metal-forming machine tool having tool combination blocks - Google Patents

Description

The present invention relates to a multi-stage Forming machine with tool combination blocks, as in the preamble of independent claim 1 is defined.

With conventional multi-stage metal forming machines, this means Removing, fastening and setting tools Loosen or screw in screws, so that a tool change usually around an hour or more lasts. Since the metal forming machine is out of order during this time Operation is a considerable loss of productivity connected. Forming machines were therefore developed that allow faster tool changes.

DE-A-197 22 228 describes a multi-stage forming machine known in which each tool in a tool cartridge is arranged by means of a clamping device in the Forming machine is held. The clamped tool cartridges can be replaced relatively quickly if necessary be so that the downtime of the forming machine significantly can be reduced. A tool change takes time but still comparatively long because of the fine adjustment the mutual distance between two opposite interacting tools on the forming machine.

EP-B-0 354 428 describes a generic multi-stage forming machine described one on a stationary machine body attached first tool combination block with, for example five matrix blocks and one on one in the direction of this first tool combination block reciprocable press slide attached second tool combination block with, for example comprises five stamp blocks. The tool combination blocks are interchangeable as a whole and outside the forming machine adjustable. To ensure sufficient tension the tool combination blocks with the machine body or press slide screwed. This has the Disadvantage that a quick change of tool combination blocks is not possible because of the operating personnel must be handled from the outside with auxiliary tools.

Given the disadvantages of the previously known, described above Forming machines, the invention is the following Based on the task. A multi-stage forming machine has to be created of the type mentioned at the beginning, in which the downtime the forming machine when changing the tool comparable forming machines of the prior art can be significantly reduced.

This object is achieved by the multi-stage according to the invention Forming machine solved as in the independent claim 1 is defined. Preferred design variants result itself from the dependent claims. In claim 11 is a tool combination block for such multi-stage forming machine defined.

The essence of the invention is that a multi-stage Forming machine a first and second tool combination block comprises, at least one of which is at least one Has flaps with which he can directly or indirectly on a stationary machine body or on a Pressing slides attached clamping cams directly from above or indirectly on the machine body or on the press slide is attached. The flap and the tensioning cam are like this trained that by the dead weight of the tool combination block and / or one in the vertical direction on the tool combination block acting tension an elastic tension the tool combination block and the machine body or

Press slide produced against each other in the horizontal direction becomes. The first and second tool combination block have interacting tool blocks and are stationary Machine body or attached to the press slide, that in the direction of the first tool combination block is movable.

Hanging the tool combination block with clamping tabs directly or indirectly on the machine body or on the press slide enables quick attachment and detachment of the Tool combination blocks, since there is no screw connection can be. The necessary tensioning of the tool combination block with the machine body or press slide generated by the tensioning tab and the tensioning cam that the Dead weight of the tool combination block and / or one in vertical Direction of clamping force acting on the tool combination block partially divert into a horizontal clamping force. The tensioning flap is pre-tensioned by the tension, that it is due to production-related forces on the tool combination block is only insignificantly burdened, whereby it is durable. A possible tensioning device can be arranged outside the tool room, so that it doesn't take up any space in it. The replacement of an entire tool combination block allows fine adjustment the mutual distance between two opposite interacting tool blocks outside the Forming machine, while this is still with the old tool combination block can continue to be operated. The downtime can remove the old tool combination block and the actual attachment of the new tool combination block be restricted.

Usually both tool combination blocks are with at least provided with a flap and directly or indirectly on the machine body or press carriage, it is in principle but also conceivable that the one tool combination block is attached in a different way.

In a first advantageous embodiment, the mentioned at least one flap in the upper edge area of the tool combination block and in the lower edge area the tool combination block is at least one more Clamping flap arranged over another clamping cam from above directly or indirectly on the machine body or is attached to the press slide.

In a second advantageous embodiment, the mentioned at least one flap in the upper edge area of the tool combination block and in the lower edge area of the tool combination block is at least one down protruding clamping cams arranged, which in a direct or indirectly attached to the machine body or to the press slide, inserted upward open flap is.

These two design variants allow one above and even clamping of the tool combination block below.

Advantageously, the one or more flaps have and / or the one or more clamping cams to the vertical inclined contact surface for the assigned clamping cam or Flap on, which is preferably curved, so that when exerting a vertically downward force on the tool combination block or the flaps the assigned clamping cam (s) bent outwards will or will. Due to the elastic bend of the or Tension flap (s) can have a high preload in horizontal Direction are generated for a safe, tense Attachment of the tool combination block ensures the emergence counteracts fretting rust and a mutual absolutely precise adaptation of the contact surfaces makes unnecessary. The curvature of the contact surface prevents Edge pressure is created.

Advantageously, at least one of the upper edge area two tool combination blocks several clamping tabs and / or in lower edge area of this tool combination block several after clamping cams projecting below are spaced apart. This allows the tool combination block to be wide area can be supported and braced.

The tool combination block preferably has clamping tabs or at least one of the tool combination blocks with clamping tabs at least one stop on a stop surface outside the tool combination block on top. The tool combination block becomes vertically precise when it is hooked in positions and defines the maximum tension force.

Fig. 1 -

einen Teil einer erfindungsgemässen mehrstufigen Umformmaschine mit matrizenseitigem Werkzeugkombiblock und Lösevorrichtung in einer Vertikalschnittansicht;

Fig. 2 und 3 -

Detailschnittansichten eines Spannlappens, Anschlags und Spannnockens der Umformmaschine während des Einhängens;

Fig. 4 -

einen Teil der Umformmaschine mit matrizenseitigem Werkzeugkombiblock und Spannvorrichtung in einer weiteren Vertikalschnittansicht;

Fig. 5 -

den matrizenseitigen Teil der Umformmaschine bei entferntem Werkzeugkombiblock von der Stempelseite aus gesehen;

Fig. 6 -

den ausgebauten matrizenseitigen Werkzeugkombiblock der Umformmaschine;

Fig. 7 -

einen Teil der Umformmaschine mit stempelseitigem Werkzeugkombiblock und Lösevorrichtung in einer Vertikalschnittansicht;

Fig. 8 -

einen Teil der Umformmaschine mit stempelseitigem Werkzeugkombiblock und Spannvorrichtung in einer weiteren Vertikalschnittansicht;

Fig. 9 -

den stempelseitigen Teil der Umformmaschine bei entferntem Werkzeugkombiblock von der Matrizenseite aus gesehen; und

Fig. 10 -

den ausgebauten stempelseitigen Werkzeügkombiblock der Umformmaschine.

In the following, the multi-stage forming machine according to the invention is described in more detail with reference to the accompanying drawings using an exemplary embodiment. Show it:

Fig. 1 -

a part of a multi-stage forming machine according to the invention with a die-side tool combination block and release device in a vertical sectional view;

2 and 3 -

Detail sectional views of a clamping tab, stop and clamping cams of the forming machine during hanging;

Fig. 4 -

a part of the forming machine with die-side tool combination block and clamping device in a further vertical sectional view;

Fig. 5 -

seen the part of the forming machine on the die side with the tool combination block removed from the die side;

Fig. 6 -

the removed die-side tool combination block of the forming machine;

Fig. 7 -

a part of the forming machine with die-side tool combination block and release device in a vertical sectional view;

Fig. 8 -

a part of the forming machine with die-side tool combination block and clamping device in a further vertical sectional view;

Fig. 9 -

the part of the forming machine on the die side seen from the die side with the tool combination block removed; and

Fig. 10 -

the removed die-side tool combination block of the forming machine.

Figures 1 to 6 - die-side part of the forming machine

A multi-stage forming machine according to the invention comprises a machine body 1, on which by means of screws 15 Lock plate 5 is attached. In wedge recesses 53 (Fig. 5) Force wedges 16 arranged in the lock plate 5 (Fig. 4) serve in addition to the screws 15 for support the vertical bracing forces that occur. By the Machine body 1 and the lock plate 5 run through an ejector rod bore 28 and an ejector rod guide 29 (Fig. 4). At its upper end, the Lock plate 5 two elongated clamping cams 52 on the one on both sides arranged above the lock plate 5 Centering housing 12 each up to its lateral Extend edge. At the lower end of the lock plate 5 are distributed across its width are four flaps that protrude upwards 51 attached.

A tool combination block is suspended in the lock plate 5 3 with a support plate 32, a centering plate 36, usually five die blocks 35 and one themselves Block guide extending over the entire width 34. In Fig. 6 is a matrix block 35 drawn, by means of Screws 24 is attached to the centering plate 36. The The die is clamped using claws 351 and Claw screws 352. The block guide 34, centering plate 36 and support plate 32 are by means of screws 18 and Centering plate 36 and support plate 32 additionally by means of Screws 17 connected together. At the top of the support plate 32 are four evenly distributed across the width Tension flap 31 formed while at the lower end four clamping cams 322 are formed. Between each two outer clamping tabs 31 are stops 33 by means of Screws 19 attached to the support plate 32 on the stop surfaces 521 on the clamping cams 52 of the lock plate 5 rest and so the tool combination block 3 vertically exactly position. In wedge recesses 323 (Fig. 6) in the support plate 32 arranged force absorption wedges 316 (FIG. 2 and 3) serve in addition to the screws 19 for support of the tension forces that occur. The support plate 32 has in the further slot-shaped recesses 324, which the Allow insertion and removal of the tool combination block 3 while ejector rods in the area of the support plate 32 protrude.

For the horizontal centering of the tool combination block 3 in the support plate 32 a centering pin 11 with a ball head screwed (Fig. 4). When attaching the tool combination block 3, the ball head into the centering housing 12 introduced and through its special training (Fig. 5) directed to the desired horizontal position.

Hooking the tool combination block 3 into the lock plate 5 is generally done using an external, here unsigned crane device. To facilitate the Inserting the tool combination block 3 in the tool room are insertion aids 21, 22 on the machine body 1 and on the Lock plate 5 provided. The clamping tabs 31 of the tool combination block 3 are the tensioning cams 52 of the Lock plate 5 hanged while the clamping cams 322 des Tool combination blocks 3 between the clamping tabs 51 and vertical contact surface of the lock plate 5 and the ball head of the centering pin 11 inserted into the centering housing 12 become. This is due to the weight of the tool combination block 3 reaches a position in which the stops 33 not yet on the stop surfaces 521 of the Clamping cams 52 rest, but the clamping tabs 31 already by the clamping cams 52 in the direction of arrow A (FIG. 3) bent minimally outwards. Corresponding are also the clamping tabs 51 by the clamping cams 322 has been bent minimally outwards. The flap 31 and 51 are biased and practiced in this way a horizontal clamping force that the tool combination block 3 and the lock plate 5 and thus indirectly the machine body 1 brace against each other.

Since that caused by the weight of the tool combination block 3 Tension is generally not sufficient with two arranged below the tool combination block 3 Clamps 7 (Fig. 4, 5) one in the vertical direction generates clamping force acting on the tool combination block 3, through which the flaps 31 and 51 are further elastic be bent outwards and the bracing on the desired measure is increased. The jigs 7 each comprise a clamping lever 71 which is one at the Lock plate 5 mounted lever axis 73 is rotatable. The tensioning levers 71 are connected by means of hydraulic cylinders 74 Tappets 741 can be actuated and press when actuated by Screws 20 attached to the support plate 32 clamping bracket 72 down. 4 are the two extreme positions a tension lever 71 drawn. Bending springs 75 ensure that the clamping lever 71 is constantly on the plungers 741 double-acting hydraulic cylinder 74.

Depending on the machine size, the required clamping forces and Tensions different. With two clamping devices 7 were with a vertical tension on the two Clamp 72 of 110 kN each depending on the material the flap 31, 51 in the tenths of a millimeter range and one Tension force of 250 kN reached in the pressing direction. at The clamping devices became smaller or larger forming machines 7 to tension forces in the pressing direction of 125 kN or 500 kN.

To release the tool combination block 3 there is a one arranged below it Release device 9 is provided, the one about a release lever axis 92 rotatable release lever 91 includes the on a support 93 attached to the machine body 1 is. The release lever 91 is by means of a hydraulic cylinder 94 can be actuated with plunger 941 and presses in when actuated attached to the centering plate 36 by means of screws 23 Lifting piece 95 upwards. In Fig. 1 are the two extreme positions of the release lever 91 drawn.

Figures 7 to 10 - stamp-side part of the forming machine

The attachment of a die-side tool combination block 4 on one in the direction of the die-side tool combination block 3 reciprocable press carriage 2 is carried out basically the same as the attachment of the die side Tool combination blocks 3 on the machine body 1.

A lock plate is attached to the press slide 2 by means of screws 115 6 attached. The lock plate points at its upper end 6 elongated across its width Clamping cams 62 on, while four at their lower end projecting flaps 61 are attached. The lock plate 6 furthermore has slot-shaped recesses 64 on the insertion and removal of the tool combination block 4 allow while the tool-side ejector rods protrude into the area of the lock plate 6.

The tool combination block is suspended in the lock plate 6 4 with a wedge-shaped support plate 42, five adjustment wedges 44, an adjustable wedge housing 47 and normally five adjustment plates 46 and five stamp blocks 45. In Fig. 10 there is only one by means of screws 124 on the associated one Adjustment plate 46 attached stamp block 45 drawn. The stamps are clamped using claws 451 and claw screws 452. The adjustment plates 46 are screwed into the adjusting wedge housing 47 Bolts 126 and nuts 127 attached to the adjusting wedge housing 47, the adjustment plates 46 before screwing the nuts 127 around the bolts 126 have play so that they can be aligned with the matrices. The support plate 42 and the adjusting wedge housing 47 are by means of Screws 117 connected.

At the upper end of the support plate 42 are four over the Wide distributed flap 41 formed while at the bottom End on both sides below the support plate 42 arranged centering housing 14 four clamping cams 422 formed are. Between the two outer flaps 41 are stops 43 by means of screws 25 on the support plate 42 attached to the stop surfaces 621 the clamping cam 62 of the lock plate 6 rest and so the Position tool combination block 4 exactly vertically. In wedge recesses 423 (Fig. 10) arranged in the support plate 42 Force wedges 416 serve in addition to Screws 25 to support the clamping forces that occur.

For the horizontal centering of the tool combination block 4 in the lock plate 6 a centering pin 13 with a ball head screwed (Fig. 7). When attaching the tool combination block 4, the centering housing 14 over the ball head guided and directed into the desired horizontal position.

Hooking the tool combination block 4 into the lock plate 6 again takes place by means of an external one, not here drawn crane device. The clamping tabs 41 of the tool combination block 4 are on the clamping cams 62 of Lock plate 6 hanged while the clamping cams 422 des Tool combination blocks 4 between the clamping tabs 61 and vertical contact surface of the lock plate 6 introduced and the centering housing 14 over the ball head of the centering pin 13 are performed. It is because of its own weight of the tool combination block 4 reaches a position in which the stops 43 not yet on the stop surfaces 621 of the Clamping cams 62 rest, but the flaps 41 and 61 already minimally elastic due to the tensioning cams 62 or 422 have been bent outwards. The flaps 41 and 61 are biased in this way and practice a horizontal Clamping force from the tool combination block 4 and Lock plate 6 and thus indirectly press carriage 2 against each other tense.

Since that caused by the weight of the tool combination block 4 Tension is generally not sufficient with two arranged below the tool combination block 4 Clamps 8 (Fig. 8, 9) one in the vertical direction generates clamping force acting on the tool combination block 4, through which the flaps 41 and 61 are still elastic be bent outwards and the bracing on the desired measure is increased. The clamping devices 8 each include a tensioning lever 81 which is one at the Lock plate 6 mounted lever axis 83 is rotatable. The tensioning levers 81 are connected by means of hydraulic cylinders 84 Plungers 841 can be actuated and press when actuated by Screws 120 attached to the support plate 42 clamping bracket 82 down. 8 are the two extreme positions a tension lever 81 drawn. Bending springs 85 ensure that the clamping lever 81 on the plungers 841 of the double-acting hydraulic cylinder 84.

The required clamping forces and tensions correspond to such as that for the die-side tool combination block Third

To release the tool combination block 4, there is a one arranged below it Release device 10 is provided, one by one Release lever axis 102 includes rotatable release lever 101, which on the lock plate 6 is mounted. The release lever 101 is can be actuated by means of a hydraulic cylinder 104 with tappet 106 and presses the tool combination block 4 when actuated via the centering housing arranged on the support plate 42 14 up. In Fig. 7 are the two extreme positions of the release lever 101 drawn.

Among the parts of a forming machine described above further constructive variations possible. Here expressly it should also be mentioned that for the clamping and releasing mechanisms many alternatives, such as toggle, Screw, cone or wedge bracing systems are conceivable.

Claims (11)

1. Multi-stage forming machine having a first combined tool block (3), fitted on a fixed machine body (1), and a second combined tool block (4), fitted on a press slide (2), which can be moved back and forth in the direction of the said first combined tool block (3), the first and second combined tool blocks (3, 4) having interacting individual tool blocks (35, 45), characterized in that at least one of the two combined tool blocks (3, 4) has at least one clamping lug (31, 41), by which it is suspended, by means of a clamping cam (52, 62) fitted directly or indirectly on the machine body (1) or on the press slide (2), directly or indirectly from above on the machine body (1) or on the press slide (2), the clamping lug (31, 41) and the clamping cam (52, 62) being designed in such a way that the dead weight of the combined tool block (3, 4) and/or a clamping force acting in the vertical direction on the combined tool block (3, 4) produces a resilient clamping together of the combined tool block (3, 4) and the machine body (1) or press slide (2) in the horizontal direction.
2. Forming machine according to Claim 1, characterized in that the said at least one clamping lug (31, 41) is arranged in the upper edge region of the combined tool block (3, 4) and

   a) at least one further clamping lug is arranged in the lower edge region of the combined tool block (3, 4) and is suspended by means of a further clamping cam from above directly or indirectly on the machine body (1) or on the press slide (2), or

   b) at least one downwardly projecting clamping cam (322, 422) is arranged in the lower edge region of the combined tool block (3, 4) and is pushed into an upwardly open clamping lug (51, 61) fitted directly or indirectly on the machine body (1) or on the press slide (2).
3. Forming machine according to Claim 1 or 2, characterized in that the clamping lug or lugs (31, 41, 51, 61) and/or the clamping cam or cams (52, 62, 322, 422) has or have a bearing face for the assigned clamping cam (52, 62, 322, 422) or clamping lug (31, 41, 51, 61), which face is inclined with respect to the vertical and is preferably curved, so that when a vertically downwardly directed force is exerted on the combined tool block (3, 4) the clamping lug or lugs (31, 41, 51, 61) is or are bent resiliently outwards by the assigned clamping cam or cams (52, 62, 322, 422).
4. Forming machine according to one of Claims 1 to 3, characterized in that to the machine body (1) and/or to the press slide (2) there is fastened an apron or respective aprons (5, 6), on or to which the clamping cam or cams (52, 62) on the machine-body side or press-slide side and, if appropriate, clamping lugs (51, 61) is or are formed or fastened.
5. Forming machine according to one of Claims 1 to 4, characterized in that at least one of the combined tool blocks (3, 4) comprises a supporting plate (32, 42), on or to which the clamping lug or lugs (31, 41) on the combined-tool-block side and, if appropriate, clamping cams (322, 422) is or are formed or fastened.
6. Forming machine according to one of Claims 1 to 5, characterized in that a plurality of clamping lugs (31, 41) are arranged in the upper edge region of at least one of the two combined tool blocks (3, 4) and/or a plurality of downwardly projecting clamping cams (322, 422) are arranged at intervals next to one another in the lower edge region of this combined tool block (3, 4).
7. Forming machine according to one of Claims 1 to 6, characterized in that it has at least one clamping device (7, 8), by which a clamping force acting in the vertical direction on one of the combined tool blocks (3, 4) can be produced, it being possible for the clamping device (7, 8) to be arranged underneath the combined tool block (3, 4) and to have a hydraulically actuable clamping lever (71, 81).
8. Forming machine according to one of Claims 1 to 7, characterized in that it has at least one releasing device (9, 10), by which a releasing force acting in the vertical direction on one of the combined tool blocks (3, 4) can be produced, it being possible for the releasing device (9, 10) to be arranged underneath the combined tool block (3, 4) and to have a hydraulically actuable release lever (91, 101).
9. Forming machine according to one of Claims 1 to 8, characterized in that the combined tool block (3, 4) with clamping lugs (31, 41) or at least one of the combined tool blocks (3, 4) with clamping lugs (31, 41) has at least one stop (33, 43), which rests from above on a stopping face (521, 621) outside the combined tool block (3, 4) for the accurate vertical positioning of the latter.
10. Forming machine according to one of Claims 1 to 9, characterized in that the combined tool block (3, 4) with clamping lugs (31, 41) or at least one of the combined tool blocks (3, 4) with clamping lugs (31, 41) has a centring element, in particular a centring pin (11) or centring housing (14), which interacts with a mating element, in particular a centring housing (12) or centring pin (13), outside the combined tool block (3, 4) when fitting the combined tool block (3, 4) for the horizontal centring of the latter.
11. Combined tool block (3, 4) for a multi-stage forming machine according to one of Claims 1 to 10 having a fixed machine body (1) and a press slide (2), which can be moved back and forth, having at least two individual tool blocks (35, 45), characterized in that it has at least one resiliently bendable clamping lug (31, 41), by which it can be suspended, by means of a clamping cam (52, 62) fitted directly or indirectly on the machine body (1) or on the press slide (2), directly or indirectly from above on the machine body (1) or on the press slide (2), the clamping lug (31, 41) being designed in such a way that it is bent resiliently outwards by the clamping cam (52, 62) during suspending and thereby exerts a horizontal clamping force.

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