DE19756469A1 - Punch press for stamping work pieces - Google Patents

Abstract

Punch press has a punch head and loading and advance unit at moving sections of a common tool. In a punch press, the punch head and the loading/advance system (28) are at sections (20,23) of the common tool (13) which move in relation to each other. The inner guide is bent and flexible, at least in a part-section between the loading/advance system, as a flexible hose with durable elasticity such as of plastics. The tool has at least two tool parts, which move against each other. The loading/advance unit (28) is at a first section (20) of the tool or tool part (13), and the punch head is fitted at a sliding section (23) with the first section (20). The first section (20) has a push function and the other section (23) acts as a retainer.

Description

The invention relates to a tool arrangement according to the preamble Claim 1 and a punching head device according to the preamble claim 14.

For example, the production of workpieces from a coil is known peeled sheet, e.g. B. sheet steel, or from individual sheets or sheets below Use of a press and tools arranged in such a press (for example also follow-up tools) through punching, permanent deformation etc.

It is also known here that the workpieces are produced with the press at the same time to be provided with connecting elements, by joining and inserting the respective connecting element in a prepared, punched hole and through then pressing the connecting elements in the workpiece. It is also known Workpieces in the tool through connecting elements, for example rivets, connect with each other.

Connection elements in the sense of the invention are u. a. Nuts, bolts, too Threaded bolts, rivets etc.

Especially for joining and fastening connecting elements, for example Nuts in workpieces are also known as punch heads or punch head devices (e.g. DE 44 15 973 - A1), wherein this punching head device consists of a punching head a loading and feeding device and a rigid guide for the There are connecting elements between the two. The function of the punching head is in essentially joining and connecting a connecting element to the workpiece by pressing. The function of the feed and loading device is in essential to ensure that the internal, in the known case rigid management between the loading and feed device and the punching head always with one  sufficient number of fasteners is filled, and that on this Fasteners have a feed effect in the direction of the punching head becomes. One turns on synchronously with the press movement and depending on this the loading and feed device provided loading position for reloading released at least one connecting element and this is then in the in internal leadership formed series of connecting elements for the transfer to the Punching head lined up.

A disadvantage of the known punching head devices is u. a. that the joining or Introducing the connecting elements on the workpieces only in one axial direction can take place, which is equal to the axial direction of the press movement.

In the sense of the invention, "press" basically means a machine or device with at least two presses or To understand device parts. A press is preferably a tool press type mentioned above for producing workpieces from sheet metal by stamping and permanent deformation.

"Counteracting tool and press parts" are such parts in the sense of the invention the press or the device or one provided on the press or device Tool that is relative in an axial direction, preferably in a vertical axis are moved to each other in a press or device stroke and directly or indirectly on the workpiece to be manufactured or on the sheet used for this act. Such tool or press or device parts are, for example the press table, directly there or via a clamping plate or intermediate plate attached tool part, a hold-down device that goes up and down in the press stroke this holding-down tool or a counter-tool Press stamp etc.

The term "press stroke" also used below refers to the Movement of the press, consisting of a working stroke in the sense of a closing or  moving the counteracting press parts towards one another and a return stroke, in Meaning of opening the press or moving the counteracting ones apart Press parts, whereby the following considerations also assume that every press stroke begins with a working stroke.

The object of the invention is to show a tool arrangement with which it is possible is the introduction or joining of the connecting elements in an axial direction to make, which is different from the axial direction of the press movement.

To solve this problem, a tool arrangement is according to the Claim 1 and a punching head device according to claim 14 educated.

With the arrangement according to the invention, it is also possible to use connecting elements in to bring into the workpieces in an axial direction that is different from the axial direction of the Movement of the press deviates, for example in an axial direction perpendicular to Movement of the press. This makes it z. B. without turning or turning the workpieces in a follow-up tool possible, fasteners also on surfaces of a Provide workpiece that are in planes that are aligned with the axis of the Include press movement at an angle other than 90 °.

Developments of the invention are the subject of the dependent claims. The invention will explained in more detail below with reference to the figures using an exemplary embodiment. It demonstrate:

Fig. 1 and 2, a connecting element in the form of a nut and a plate or a workpiece prior to insertion of the nut into a prepared in the workpiece hole or after insertion and fastening of the nut in the workpiece by pressing (Fig. 1);

Figure 3 is a simplified representation in side view of a press and a valve provided in the press tool, for example, progressive die, together with a tool arranged in the inventive device.

Fig. 4 is an enlarged illustration of a slider formed as a part of the tool, together with a holding-down device and provided on the spool or hold-down elements of the invention punching head device;

Fig. 5 In section, a loading and feeding device of the punching head device.

For the purpose of a simplified description, the three spatial axes running perpendicular to one another are indicated in the figures, namely the horizontal X-axis, which lies in the drawing plane of these figures in FIGS. 3 and 4, the likewise horizontal Y-axis, which in the representation of FIG . 3 and 4 is perpendicular to the plane of the drawing of these figures, and the vertical Z axis.

In the figures, 1 is a workpiece produced from a sheet metal by punching, which is shown as an elbow to explain the invention, but can also have a different shape. 2 with a connecting element is designated, which is designed in the embodiment shown as a Muller, with a collar 2 'in a leg 1 ' of the workpiece 1 by punching opening 3 by inserting or joining and then pressing using a press ram 4 (Pluager) of a punching head 5 and a compression ring 6 of a counter tool 7 , for example a filler slide 7 of the press tool or of the lower part 13 of the press tool, can be fastened in the workpiece 1 .

The workpiece 1 is produced in a press 8 , specifically in the press tool provided in this press, which is, for example, a follow-up tool and, among other things, also has the counter tool 7 with the press ring 6 . As will be described in more detail below, in the embodiment shown the respective connecting element 2 is inserted from the side in the horizontal direction, ie in the X-axis into the associated opening 3.

The press 8 essentially consists of a press frame 9 , which forms the lower part 10 of the press and on which the press ram 11 is guided so that it can be moved up and down in the vertical direction (Z axis). On the lower part 10 of the press 8 , a clamping plate 12 is provided, on which the lower tool part 13 is fastened directly or via an intermediate plate. A further platen 14 is provided on the underside of the press ram. An upper tool part 15 is held on this in the form of a stamp plate.

Furthermore, the press 8 has a sprung hold-down device 16 , which is arranged between the upper tool part 15 and the lower tool part 13 and, when the press 8 is closed, against the force of hold-down springs 17 which act between the hold-down device 16 and the tool part 15 Support workpiece 1 . In the hold-down device 16 , a plunger-like slide 18 is provided, which can be displaced in the vertical direction against the action of a spring, not shown, when the press or the tool is closed by a punch 19 provided on the tool part 15 .

For the fastening of the nuts 2 on the leg 1 'of the respective workpiece 1 , a slide 20 is further provided in the lower tool part 13 , which in the horizontal axis (X axis) against the action of not shown restoring means, for example against the action of at least one spring is movable from a starting position into a working position in which the counter tool 7 facing side or surface 20 'of the slide 20 has a smaller distance from the counter tool 7 or of the local press ring 6 as in the initial position of the slide 20th

The movement of the slide 20 takes place synchronously with the press movement or the press stroke (arrow A), in each case when the press 8 is closed. For the movement, the slide 20 has an inclined surface 20 'on its side opposite the side or surface 20 '. ', which includes an angle of less than 90 ° with the X, Y plane, which opens to the side 20 '. As soon as when the press is closed, the hold-down device 16 rests against the workpiece 1 or against the lower tool part 13 via the springs 17 , the slide 18 rests with an inclined surface 18 ′ against the inclined surface 20 ″, so that when the tool is closed further and by means of the stamp 19 then interacting with the slide 18 , ie by moving the slide 18 downward, the slide 20 is moved in the direction of the X-axis from its initial position in the illustration selected for FIG. 4 to the left into the working position.

On the surface or side 20 ', the slide is provided with guides 22 extending in the direction of the X axis, on which a hold-down device 23 is guided so as to be displaceable in the direction of this X axis. Hold-down springs act between the slide 20 and the hold-down device 23 , which are indicated very schematically by 24 and prestresses the hold-down device 23 in a position in the direction of the counter tool 7 .

For the controlled feeding of the nuts 2 to the "joining area" 25 of the tool, on which (joining area) these nuts 2 are each inserted into the relevant opening 3 of the leg 1 'of a workpiece 1 , the punching head designated in the figures with a total of 26 is used. Device 26 , which forms a fully functional, completely interchangeable unit and is mounted on the lower tool part 13 in the manner described in more detail below, in such a way that the punching head 5 is located on the joining area 20 on the side of the hold-down device 23 facing the counter tool 7 .

The device 26 includes, among other things, a guide 27 for the nuts 2 , which is designed such that the gauzes 2 are arranged in a row next to one another in this guide 27 . Furthermore, the guide 27 is flexible and ends with one end on the punching head 5 , as will be described in more detail below. The other end of the guide 27 is connected to a loading and feed device 28 , which is also part of the device 26 and, in the embodiment shown, on the upper side of the slide 20 lying in the XY plane, ie in a recess 20 ″ provided there. 'is attached. The loading and feed device 28 is connected to a sorting and feeding device 30 via a flexible hose 29 . Via this sorting and feeding device 30 , which is set up to the side of the press 8 , the nuts 2 are each supplied in a prescribed position or orientation (accurate) to the device 26 or the loading and feeding device 28 , for example by Shoot in the nuts 20 one at a time, one after the other, via the hose 29 , or with the aid of a continuous flow of conveying air, in each case as a group consisting of a plurality of nuts 2 , etc. The nuts 2 are always supplied via the flexible hose 29 , depending on of the press movement or of the need for nuts 2 on the punching head 5. The loading and feed device 28 is designed such that with each press stroke a predetermined number of nuts, ie in the embodiment shown, a nut can pass through the loading and feed device, so that each form a closed row of nuts 2 in the guide 27 is in such a way that the nuts in this row lie close together. After the respective loading of a nut, a feed element 29 provided in the loading and feed device acts on the row of nuts or on the last nut of this row in the sense of a feed to the punching head 5 , ie in one designated by B in FIG. 4 Feed direction.

In the embodiment shown, the internal guide 27 is curved and is composed of the section 27 'extending in the direction of the X-axis and of the section 27 ''extending in the direction of the Z-axis and of the curved section 27 ' connecting the two sections. '' together.

At least one nut is reloaded at the end of a press stroke, on each Fall before closing the tool press.

In order to ensure that the nuts 2 reach the punching head 5 in the predetermined orientation via the flexible hose 29 , the loading device 28 and the guide 27 , the cross section of the channel for guiding the nuts 2 , which is formed in the aforementioned elements, is in the shape of these nuts 2 adapted, ie it has a rectangular cross-section in such a way that the nuts 2 can only pass this cross-section in the correct orientation, in such a way that these nuts 2 are arranged, for example, in section 27 'with their collar 2 ' on top.

The punching head 5 has a rigid guide 32 for the nuts 2 on a housing 31 , with which this punching head is fastened on the side of the holding-down device 23 facing away from the surface 20 , which (guide) connects to the section 27 ″ and likewise in this way is formed that the nuts 2 abut in a row in this guide 32 and are arranged in the prescribed orientation. The guide 32 , which extends in the direction of the Z axis, ends at a tappet channel 33 of the punching head 5 , which (tappet channel) lies with its axis perpendicular to the axis of the guide 32 in the X axis, ie also in the axis of movement of the slide 20. In the tappet channel 33 , the press-in tappet 4 of the punching head 5 is displaceably guided, namely against the action of spring means from an initial position in which the end face 4 'of the tappet 4 is so far from an end face 5 ' of the punching head 5 , that the tappet 4 releases the tappet channel 33 to the guide 32 for tracking a nut 2 , and a joining and pressing position. This is shown in FIG. 2. The respective nut 2 lying against the end face 4 'and held there by suitable means, for example by a permanent magnet or by vacuum, is inserted with its collar 2 ' into the opening 3 and by pressing between the plunger 4 and the pressing ring 6 in the workpiece 1 attached. The slide 4 is moved synchronously with the movement of the press via the slide 20 , at the end of the closing of the press or the tool. For this purpose, the slide 20 is formed on the surface 20 'with a plunger 34 which interacts with the plunger 4 .

The joining and fastening of the respective nut 2 is thus carried out in such a way that after the introduction of a workpiece 1 with its leg 1 'into the joining area 25 of the open press 8 when the press is subsequently closed, the hold-down 23 or the springs 24 are used first End face 5 'of the punching head 5 comes to rest against the leg 1 '. Then, when the press is closed further, the plunger 4 of the punching head 5 is moved via the punch 34 to join and press the nut 2 .

A possible embodiment of the loading and feed device 28 is described below by way of example and explanation, with reference to FIG. 5. As shown, this device consists of a housing 35 , in which a housing 35 extends in the direction of the X axis Guide channel 36 is formed for the nuts 2 . The flexible hose 29 is connected to one end of the guide channel 36 . The other end of the channel 36 merges into a rigid guide 37 , which is provided on a plate-shaped housing 38 and to which the guide 27 is connected in the conveying direction B.

The channel 36 and the rigid guide 37 are in turn designed so that an exact orientation of the nuts 2 is maintained. In the interior of the housing 35 , a feed rocker 39 is pivotally held at one end, specifically about a pivot axis perpendicular to the longitudinal extent of the channel 36 , ie in the representation of the figures about the Y axis or in the XZ plane. In the embodiment shown in FIG. 5, the feed rocker 39 or its pivot bearing is located below the channel 36 . The feed rocker 39 can be moved from a loading position, in which the rocker and in particular also its upper end 39 'outside the channel 36 , into a feed position in which the upper end 39 ' of the rocker 39 passes through a slot-shaped opening from below the channel 36 extends and bears with its abutment surface 29 the flexible tube 39 '' facing away from the reloaded, last nut 2 in the channel 36th

The feed rocker 39 is pivoted by an actuating element, which in the embodiment shown is a pneumatic cylinder, depending on and in synchronization with the movement of the press in such a way that the feed rocker 39 is briefly at the end of each press stroke or at the start of each press stroke is pivoted into the loading position so that a new nut 2 can be brought to the loading position 41, for example by shooting in, whereupon the feed rocker 39 is pivoted back into the feed position and rests with its contact surface 39 against the reloaded nut 2 at the loading position 41 , and with a feed force generated, for example, by the actuating element 40 . The slot-shaped opening for the feed rocker 39 is narrower than the contact surface for the underside of the nuts 2 in the channel 36.

In the device 26 , the punching head 5 and the loading and feed device 28 are constantly connected to one another via the internal guide 27 , ie in particular also independently of the press movement. The curvature of the internal guide 27, 27, the relative movement between the slider 20 and the blank holder 23 is also possible with fully occupied with the connecting elements or nuts 2 guide, since in this case the only in the curved portion 27 '''as a function of the relative position Slider 20 and hold-down 23 a more or less strong curvature of the section 27 '''takes place and the resulting changes in length caused by the abutting connecting elements 2 are compensated for by the elastic design of the material used for the guide 27 .

The invention has been described above using an exemplary embodiment. It goes without saying that numerous changes and modifications are possible without thereby departing from the inventive idea on which the invention is based. In particular, it is also possible to design the loading and feed device 28 differently than described above and / or to actuate the flat or sword-like feed lever 39 differently than described above, for example by actuating another actuating element or directly by elements of the tool, e.g. B. by the movement of the slide 20 in the lower tool part 13.

Reference list

1

workpiece

1

'Thigh

2nd

mother

2nd

' Federation

3rd

opening

4th

Press ram

4th

'End face

5

Punching head

5

'End face

6

Press ring

7

Counter tool

8th

Press

9

Press frame

10th

Press lower part

11

Press ram

12th

Clamping plate

13

lower tool part

14

Clamping plate

15

Stamp plate

16

Hold-down

17th

Hold-down spring

18th

Spool

19th

stamp

20th

Slider

20th

'' Slide area

20th

'' Bevel

20th

'''Recess

22

guide

23

Hold-down

24th

Hold-down spring

25th

Joining area

26

contraption

27

internal leadership

28

Loading and feed device

29

flexible hose

30th

Feeding device

31

casing

33

Tappet channel

34

stamp

35

casing

36

channel

37

rigid leadership

38

plate

39

Feed arm

39

' The End

39

'' Contact surface

40

Actuator

41

Loading position

Claims (21)

1. Tool arrangement for use in a press ( 8 ) for producing workpieces ( 1 ) and for introducing fastening elements (for example nuts, bolts, rivets, etc.) into the workpieces ( 1 ), the tool arrangement being a tool ( 13 ) and a has a punching head device ( 26 ) fastened to the tool ( 13 ) with a punching head ( 5 ) for introducing the connecting elements into the workpieces ( 1 ), the punching head ( 5 ) with a loading and advancing device ( 28 ) of the punching head device ( 26 ) an internal guide ( 27 ) for the connecting elements ( 2 ) is firmly connected, via which the connecting elements ( 2 ) are fed to the punching head ( 5 ) in succession, the loading device ( 28 ) being connected via an external feed ( 29 ) can be connected to a feed device ( 30 ) for the connecting elements ( 2 ) arranged outside the tool arrangement and the press, whereby via the loading and feed device ( 28 ), depending on the press actuation, a predetermined number of connecting elements ( 2 ) is reloaded into the internal guide ( 27 ), characterized in that the punching head ( 5 ) and the loading and feed device ( 28 ) are relative elements ( 20 , 23 ) of the tool ( 13 ) which can be moved relative to one another are provided, and that the internal guide ( 27 ) between the loading and feed device is flexible, at least in one section. 2. Tool arrangement according to claim 1, characterized in that the tool has at least two tool parts moving in opposite directions, and that the punching head ( 5 ) and the loading and feed device ( 28 ) on elements ( 20 , 23 ) of a common tool part (which can be moved relative to one another) 13 ) are provided. 3. Tool arrangement according to claim 1 or 2, characterized in that the internal, flexible guide ( 27 ) is angled. 4. Tool arrangement according to one of the preceding claims, characterized in that the loading and feed device ( 28 ) on a first element ( 20 ) of the tool or tool part ( 13 ) and the punching head ( 5 ) on a on this first element ( 20 ) slidably guided second element ( 23 ) of the tool or tool part ( 13 ) are attached. 5. Tool arrangement according to claim 4, characterized in that the first element ( 20 ) is a slide ( 20 ), preferably a in an axial direction perpendicular to the stroke movement of the press on the tool part ( 13 ) slider and the second element ( 23 ) on this slide ( 20 ) against the action of springs ( 24 ) slidably guided hold-down device ( 23 ). 6. Tool arrangement according to one of the preceding claims, characterized in that the second element ( 23 ) on the first element ( 20 ) is slidably provided in an axial direction (x-axis) which is equal to that axis direction in which the first element ( 20 ) on the tool part ( 13 ) is displaceable. 7. Tool arrangement according to one of the preceding claims, characterized in that the punching head for the joining or insertion of connecting elements ( 2 ) in each case a prepared opening ( 3 ) of a workpiece ( 1 ) and for connecting the connecting element to the workpiece after the joining is formed by pressing. 8. Tool arrangement according to one of the preceding claims, characterized in that the punching head ( 5 ) has a plunger ( 4 ) which can be displaced in a plunger channel ( 33 ). 9. Tool arrangement according to claim 8, characterized in that the plunger ( 4 ) of the punching head ( 5 ) is designed as a plunger which can be actuated by a stamp ( 34 ) of the first element ( 20 ). 10. Tool arrangement according to one of the preceding claims, characterized in that the first element ( 20 ) via a control plunger or slide ( 18 ) by the press or by a relatively to the first tool part ( 13 ) moving second tool part ( 15 , 19th ) can be actuated. 11. Tool arrangement according to one of the preceding claims, characterized in that the loading and feed unit has at least one feed element ( 39 ), specifically for generating a feed and retention effect on the connecting elements ( 2 ) arranged in the internal flexible guide ( 27 ). . 12. Tool arrangement according to one of the preceding claims, characterized in that the punching head device ( 26 ) with the punching head ( 5 ) of the loading and feeding device and the flexible guide ( 27 ) arranged therebetween forms a fully functional, interchangeable unit. 13. Tool arrangement according to one of the preceding claims, characterized in that the internal guide ( 27 ) consists at least in a partial section of a flexible or permanently elastic material, for example made of plastic, or of a hose made of this material. 14. punching head device for use in a press ( 8 ), for introducing fasteners (for example nuts, bolts, rivets, etc.) into the workpieces ( 1 ), which on a tool ( 13 ) of the press ( 8 ) or on parts of the Press ( 8 ) attachable punching head device ( 26 ) has a punching head ( 5 ) for introducing the connecting elements into the workpieces ( 1 ) and a loading and feed device ( 28 ) which is connected to the punching head ( 5 ) via an internal guide ( 27 ) for the connecting elements ( 2 ) are firmly connected, via which (guide) the connecting elements ( 2 ) are fed to the punching head ( 5 ) in series one after the other, the loading device ( 28 ) via an external feed ( 29 ) with an outside of the tool arrangement and the Press arranged feed device ( 30 ) for the connecting elements ( 2 ) can be connected, the loading and feed device ( 28 ) depending on the press actuation g a predetermined number of connecting elements ( 2 ) is reloaded into the internal guide ( 27 ), characterized in that for fastening the punching head ( 5 ) and the loading and feed device ( 28 ) to elements ( 20 , 23 ) which can be moved relative to one another Tool ( 13 ), the internal guide ( 27 ) between the loading and feed device is flexible, at least in one section. 15. punching head device according to claim 14, characterized in that the internal, flexible guide ( 27 ) is angled. 16. Punching head device according to one of the preceding claims, characterized in that the punching head for the joining or insertion of connecting elements ( 2 ) in each case a prepared opening ( 3 ) of a workpiece ( 1 ) and for connecting the connecting element to the workpiece after the joining is formed by pressing. 17. Punching head device according to one of the preceding claims, characterized in that the punching head ( 5 ) has a plunger ( 4 ) which can be displaced in a plunger channel ( 33 ). 18. Punching head device according to claim 17, characterized in that the plunger ( 4 ) of the punching head ( 5 ) is designed as a plunger which can be actuated by a punch ( 34 ) on one of the elements ( 20 ) which can be moved relative to one another. 19. Punching head device according to one of the preceding claims, characterized in that the loading and feed unit has at least one feed element ( 39 ), specifically for generating a feed and retention effect on the connecting elements ( 2 ) arranged in the internal flexible guide ( 27 ). . 20. Punching head device according to one of the preceding claims, characterized in that it forms a fully functional, interchangeable unit with the punching head ( 5 ) of the loading and feeding device and the flexible guide ( 27 ) arranged between them. 21. Punching head device according to one of the preceding claims, characterized in that the internal guide ( 27 ) consists at least in a partial section of a flexible or permanently elastic material, for example of plastic, or of a hose made of this material.