EP3962675A1

EP3962675A1 - Method and system for manufacturing longitudinal frame members for utility vehicles

Info

Publication number: EP3962675A1
Application number: EP20725130.7A
Authority: EP
Inventors: Winfried Hentschel; Marc Maurer; Markus SCHINDEL
Original assignee: Hoermann Automotive Gustavsburg GmbH
Current assignee: Hoermann Automotive Gustavsburg GmbH
Priority date: 2019-05-29
Filing date: 2020-05-06
Publication date: 2022-03-09
Also published as: DE102019114443B4; WO2020239377A1; DE102019114443A1

Abstract

In the method according to the invention for manufacturing longitudinal frame members for utility vehicles, at least one forming process and at least one punching process are used, wherein, in the punching process, a hole pattern consisting of a large number of holes is punched and at least two series of longitudinal frame members are manufactured which differ from one another at least in terms of their hole pattern. A hole-group punching apparatus having a large number of punches is used for punching at least a majority of the holes of the longitudinal frame member hole pattern to be punched, wherein the punches are individually activated or deactivated for each punching procedure depending on the hole pattern to be produced such that, during each punching procedure, a number of holes corresponding to the number of activated punches are punched simultaneously and the majority or all of the holes of the longitudinal frame member hole pattern to be punched are produced by a large number of punching procedures of the hole-group punching apparatus.

Description

Process and plant for the production of frame side members for commercial vehicles

The invention relates to a method and a system for producing longitudinal frame members for commercial vehicles.

Frame side members form a core component for truck frames and are usually produced in a forming device as a U-shaped profile from a sheet metal strip or alternatively from a sheet metal plate and can be designed in a straight or bent design. In order to fasten cross members, stiffeners, bracket plates and the like, the frame side members are also provided with a hole pattern made up of a large number of holes, specified by the vehicle manufacturer.

The creation of the hole pattern is conventionally done with large punching presses that allow the simultaneous punching of all holes in the frame side member. Simultaneous punching has the great advantage over a single hole punch that the punching process can be carried out very quickly and the entire production process is not hindered by the punching in relation to the total cycle time. In the case of single hole punching, a considerably longer period of time is required for the punching, so that several single hole punching machines are often operated in parallel. Single hole punches have the advantage that they can be adapted very quickly to another hole pattern, which in the case of large punches that generate the entire hole pattern in one punching process is associated with a considerably longer changeover time and considerable tool costs.

The invention is based on the object of specifying a method for producing longitudinal frame members, which is characterized on the one hand by a rapid punching process with possibly varying hole spacing of the individual holes in the longitudinal direction of the component and on the other hand by a short retooling time with changing hole diameters and hole spacings in the component width direction. The task also relates to a system for carrying out the method. According to the invention, this object is achieved by the features of claims 1 and 13.

In the method according to the invention for producing frame side members for commercial vehicles, at least one forming process and at least one punching process are used, with a hole pattern consisting of a large number of holes being punched during the punching process and at least two series of frame side members being produced which differ from one another at least in their hole pattern . For punching at least a large part of the holes of the hole pattern to be punched in the frame side member, a hole group punching device with a large number of punching punches is used, the punching punches being activated or deactivated individually for each punching process, depending on the hole pattern to be generated, so that one of the numbers is used for each punching process the activated punch is punched a corresponding number of holes at the same time and the majority or the entirety of the holes of the hole pattern to be punched of the frame side member is produced by a plurality of punching processes of the hole group punching device.

In the system according to the invention for the production of at least two series of longitudinal frame members for commercial vehicles, a forming device for producing a U-shaped profile from a sheet metal strip or a sheet metal blank and at least one punching device for punching a hole pattern consisting of a plurality of holes are provided, the at least distinguish two series of frame side members from each other at least by their hole pattern. The at least one punching device is formed by a hole group punching device with a plurality of punching punches, the punching punches being individually activatable or deactivating for each punching process depending on the hole pattern to be generated by means of an activation unit, so that for each punching process a number corresponding to the number of activated punches holes are punched at the same time, the plurality of punches being arranged such that at least a large part of the holes of the hole pattern to be punched can be produced by a plurality of punching processes. In the considerations on which the invention is based, it was recognized that a large number of holes are arranged on straight lines that are aligned parallel to one another and run in the longitudinal direction of the frame side members, the so-called hole tracks. The holes lying on these hole tracks are preferably punched by the hole group punching device, it being possible, if necessary, to punch several holes at the same time. With the hole group punching device, not all holes of a hole pattern can be punched in one punching process, but the punching process is considerably shortened in time compared to a punching process in which only a single hole punch is used, since the punch is only activated or deactivated for each punching process need not be positioned in the transverse direction with respect to the component. This enables the hole pattern to be individualized.

If another series of frame side members is to be produced, which differs at least in its hole pattern from the previously produced frame side member, this can possibly be done with the same hole group punching device if the hole tracks are the same distance from each other and the same punching punches can be used with regard to their diameter . If the hole track spacing or the punch does not fit, the hole group punching device can be converted quickly due to the manageable number of punch punches. Preferably 5 to 20 punches are used in the punching device for groups of holes.

In the forming process, in particular a U-shaped profile is produced from a sheet metal strip by roll profiling or die bending. The U-shaped profile can have a material thickness of 4 mm to 12 mm, whereby it is also conceivable that the material thickness changes in the sheet longitudinal and / or sheet width direction, so that the formed U profile has a non-constant sheet thickness in sheet metal longitudinal or Has sheet width direction. This allows certain areas to be reinforced, while material and thus weight can be saved in other areas. The hole group punching device preferably works as a mechanical hole group punching device with a stroke frequency of at least 50, preferably at least 100 and most preferably at least 140 strokes per minute, whereby the punching process can be carried out at high speed. Furthermore, the hole group punching device can be designed in such a way that at least 70%, preferably at least 80%, most preferably at least 90% of all holes in the hole pattern to be punched can be punched with it.

According to a further embodiment of the invention, at least one further separating or cutting process for producing at least one further closed contour to complete the hole pattern to be punched can be provided before or after the holes are punched in the hole group punching device. This can be done, for example, by a single punch and is intended in particular for those contours that do not lie on one of the hole tracks or have a shape or size that occurs only rarely. It is further provided that each hole pattern is generated on the basis of a control data set which assigns all holes that can be punched with the hole group punching unit to the punching process with the hole group punching unit and the remaining holes to the further separating or cutting process. With each punching process of the hole group punching device, a longitudinal section of the hole pattern to be punched is punched, the holes to be punched in each longitudinal section in the

Control data record are stored and the punching punches are activated or deactivated individually for each punching process with the aid of the control data record. The hole group punching device punches all holes of a longitudinal section of the hole pattern to be punched assigned to the hole group punching device and the position of the hole group in the subsequent longitudinal section is set by controlled feed.

In the method according to the invention, a multiplicity of holes of the punched hole pattern adjacent in the longitudinal direction of the frame side member and / or a multiplicity of holes adjacent in the transverse direction of the frame side member can be used have different distances from each other. Furthermore, it is conceivable that holes with different diameters are punched on at least one of the hole tracks. In this way, a wide variety of hole patterns can be created to meet the respective needs. In order for the holes to be punched to be made in exactly the right position in the component, a further embodiment of the invention provides that the position of the component relative to the hole group punching device is determined using a measuring device and a misalignment is corrected by means of a positioning unit transversely to the tape feed direction becomes. In particular, the position can be measured using two sensors on each side of the component to be punched, which results in increased flexibility, since the hole pattern to be made can be aligned with the left as well as the right component edge in the sheet feed direction and also with the component center. For example, displacement sensors based on a change in resistance, a variable inductance, a variable capacitance, a pulse count, a transit time measurement or a triangulation can be used as sensors.

Furthermore, the position of the component relative to the hole group punching device can be corrected as a function of the measurement by means of at least one positioning unit transverse to the feed direction. The positioning unit moves in a translatory manner and can be designed, for example, as a linear unit with a ball screw drive or toothed belt drive, as a wedge mechanism, as an eccentric or as a comparable system for realizing a defined, linear path difference.

Furthermore, an automated test can be carried out after the punching process, which is able to recognize whether the holes to be punched are actually present. This test can be carried out, for example, by means of camera recognition, transmitted light methods, inductive, capacitive or mechanical sensors.

In principle, the forming process and the at least one punching process can take place in any order. To increase the dimensional stability of the parts to be punched Holes, however, it is more advantageous if the forming process and then the at least one punching process are carried out first.

In the system according to the invention, a separating or cutting device connected upstream or downstream of the hole group punching device can also be provided for generating the at least one further closed contour, so that the hole pattern to be punched is made up of holes in the hole group punching device and the at least one further closed contour of the Separating or cutting device composed.

According to a further embodiment of the invention, the hole group punching device has at least one tool unit, each of which consists of one

The upper tool part and a lower tool part is constructed, the upper tool part in turn having an activation bar and a stamp bar and the lower tool part being composed of a die bar and a waste bar. The activation bar is used to activate or deactivate the individual punching punches guided in the stamping bar. A particularly high one

System flexibility can be achieved in that the activation units have an increased width compared to the punching punches and a slight change in the position of the hole track in the width direction can be implemented by simply replacing the punch bar and the die bar. In addition, there is the option of changing the number of hole tracks or major changes in the hole track position, so that the activation and stamping strips as well as the die and waste strips can be exchanged.

Further embodiments of the invention are explained in more detail with reference to the following description and the drawing. Show in the drawing

Fig. 1 is a block diagram of a system according to the invention for

Production of frame side members according to a first embodiment, 2 shows a block diagram of a system according to the invention for the production of longitudinal frame members according to a second embodiment,

3 shows a schematic representation of the forming process by means of

Roll profiling,

4 shows a schematic representation of the forming process by means of

Die bending,

5a-5c different cross sections of the U-shaped profile of the

Frame side member,

6 shows the hole pattern in a longitudinal section of the

Frame side member,

Fig. 7a + 7b representation of the hole group punching device with activated

Punching at different times,

8a + 8b plan view and sectional view of a positioning unit according to a first embodiment,

9a + 9b plan view and sectional view of a positioning unit according to a second embodiment,

10a + 10b plan view and sectional view of a positioning unit according to a third embodiment,

Fig. 11a + 11b plan view and sectional view of a positioning unit according to a fourth embodiment,

12a + 12b plan view and sectional view in the area of the hole group punching device at a first point in time,

13a + 13b plan view and sectional view in the area of the hole group punching device at a second point in time, 14a + 14b representations of a punch activation according to a first exemplary embodiment,

15a + 15b representations of a punch activation according to a second

Execution example,

16 shows a schematic block diagram of the system in the area of

Hole group punching device,

17 shows a sectional illustration of the punching device for groups of holes with two activated punching punches,

18 shows a sectional view of the punching device for groups of holes with an activated punch,

19 shows a sectional view along the line H-H of FIG. 18 in the region of

Slider bar and

20a + 20b are sectional views of the group of holes punching device with two different stamps.

The system according to the invention for producing frame side members for commercial vehicles has a forming device 1, a punching device 2 for groups of holes and a separating or cutting device 3 for producing at least one further closed contour. The forming device 1, the hole group punching device 2 and the separating or cutting device 3 are formed by separate modules which can be arranged in any order in relation to one another. The representations in FIG. 1 and FIG. 2 differ in that the position of the hole group punching device 2 and the separating or cutting device 3 are each interchanged. Although it is also conceivable to carry out the forming process at the end of the process chain, in order to increase the dimensional stability of the holes to be punched it is more advantageous if the forming process is carried out first in the forming device 1 and only then the punching process. In the context of the invention, it is also conceivable that for the Punching process only the hole group punching device 2 is used. This would be possible in particular if all the holes to be punched were arranged on a manageable number of hole tracks (straight lines) running in the longitudinal direction of the frame side member.

During the forming process, in particular a U-shaped profile 4 is produced from a sheet metal strip 5a or sheet metal blank 5b. The roll profiling shown in FIG. 3 or die bending according to FIG. 4 can be used for this purpose. The U-shaped profile 4 can have a material thickness of 4 - 12 mm, whereby it is also conceivable that the material thickness in the sheet metal longitudinal direction and / or sheet width direction is designed differently in different areas, as shown by way of example on the basis of the FIGS. 5a, 5b and 5c shown longitudinal sections with wall thicknesses of different thicknesses (di, d2, d3, d4) can be seen.

6 is a finished punched longitudinal section of the U-shaped profile 4, whereby it can be seen that a plurality of the punched holes 7a, 7b is arranged on hole tracks 6a, 6b, 6c running parallel to one another and in the longitudinal direction of the U-shaped profile. The holes arranged on the hole tracks 6a-6c can in particular also differ in terms of their diameter. The holes 7a thus have a larger diameter than the holes 7b. In addition, the distance between adjacent holes can also be of different sizes both in the longitudinal direction and in the transverse direction of the frame side member. In the illustrated embodiment, the three hole tracks are each spaced apart from one another by a distance Ayi. While the holes 7a, 7b are expediently made with the hole group punching device 2, the severing or cutting device 3 is used for the holes 8a, 8b and 8c outside the hole tracks 6a-6c, which is designed, for example, as a conventional single hole punch. With the help of the two punching devices, the punched holes 7a, 7b, 8a, 8b, 8c both in the transverse direction and in the longitudinal direction of the frame side member can be made with the same or with different Distances (Ayi, Äy ₂ , Dci, Dc ₂ ) are arranged, so that hole patterns can be designed very flexibly.

The group of holes punching device 2 shown in FIGS. 7a and 7b has a plurality of punches 9, which are activated or deactivated individually in each punching process depending on the hole pattern to be generated, so that in each punching process one of the number of activated punches corresponds Number of holes punched at the same time. The majority or the entirety of the holes of the hole pattern to be punched in the frame side member can be produced in this way with a large number of punching processes of the hole group punching device 2. The group of holes punching device 2 according to FIGS. 7a and 7b has thirteen punching punches 9, five punching punches 9 being activated at the time shown in FIG. 7a. The activated punches 9 are shown with solid lines and the deactivated punches with dotted lines. At another time, shown in FIG. 7b, for example four of the nine punches 9 are activated, while the others are deactivated.

So that the holes to be punched are made in exactly the right position in the U-shaped profile 4, the position of the component relative to the group of holes punching device 2 is determined by a measuring device that includes, for example, one or more sensors 10a-10d (Fig. 8a , 8b). A misalignment can then be corrected by means of positioning units 11a-l ld. In the exemplary embodiment shown, the positioning units 11a-l ld each have two rollers 12a, 12b which encompass the legs of the U-shaped profile. To position the U-shaped profile 4, these rollers 12a, 12b are moved, for example, in a translatory manner with the aid of a linear unit 13. The others

Positioning units 11a, 11b, 11d can be designed in a corresponding manner.

A second exemplary embodiment is shown in FIGS. 9 a and 9b, in which the U-shaped profile 4 is positioned by means of only one positioning unit 14 can. The position of the U-shaped profile 4 is in turn determined by means of several sensors 10a-10d. The positioning unit 14 has two positioning units 14a, 14b, which are in rolling contact on the outside of the legs 4a, 4d of the U-shaped profile 4 and are adjustable via a linear unit 15 transversely to the longitudinal extent of the U-shaped profile. In FIGS. 10a and 10b, a third exemplary embodiment is shown that differs from the exemplary embodiment according to FIGS. 9a and 9b only in that, in addition to the positioning unit 14, a further positioning unit 16 is provided, one of the two positioning units in Conveying device of the U-shaped profile 4 is arranged in front of and a positioning unit after the hole group punching device 2, so that an extremely precise alignment of the U-shaped profile 4 can be achieved. Finally, a fourth exemplary embodiment is shown in FIGS. 11a and 11b, in which four positioning units 17a-17d are used, which are each equipped with separately controllable drives for aligning the U-shaped profile 4. In each case two positioning units are arranged opposite one another, two in front of and again two after the group of holes punching device 2.

FIG. 12 a illustrates a punching process at a point in time t 1, at which six of eleven punch punches of the group of holes punching device 2 are activated. In section EE according to FIG. 12b, three activated punches 9a, 9b, 9c can be seen immediately before the punching process. 13a shows the situation at a subsequent point in time t ₂ , at which only three punches are activated. In the sectional illustration FF according to FIG. 13b, for example, only the punch 9c is activated.

The punch 9 can be activated or deactivated via any suitable activation unit 18. In FIGS. 14 a and 14 b, the activation unit 18 is implemented by a wedge mechanism 18 a which can be actuated via a translational displacement unit 19 for activating / deactivating a punch 9. The punching die is reset, for example, via a spring element 20. In the exemplary embodiment according to FIGS. 15a and 15b, the Activation unit realized by slide plates 18b. Of course, other activation units are also conceivable within the scope of the invention.

The data flow for implementing the punching process with the aid of the hole group punching device 2 is explained in more detail below with the aid of the block diagram according to FIG. The control of the punching process of the hole group punching device 2 is controlled via a central unit 21 in which the hole pattern to be punched is also stored in the form of a data record. The feed of the U-shaped profile 4 takes place in the longitudinal direction of the profile with the aid of a feed control unit 22. The alignment of the U-shaped profile 4 transversely to the feed direction 26 takes place via a positioning control unit 23, which with the sensors (for example 10b and 10c) and the Positioning units (for example 17a-17d) are in operative connection. The activation or deactivation of the individual punches of the hole group punching device 2 takes place via the punch control unit 24 as a function of the stored control data set of the hole pattern to be generated. The actual punching process is then triggered via the press control unit 25.

The structure and the mode of operation of the hole group punching device 2 will be explained in more detail with reference to FIGS. 17 to 20b. It essentially consists of an upper tool part, which is composed of an activation bar 2.2 and a stamp bar 2.3. The corresponding lower tool part has a die strip 2.4 and a waste strip 2.5. The punches 9 are guided in the punch bar 2.3 and are activated or deactivated via activation units 18 in the activation bar 2.2.

The actual punching process is triggered by a press ram 2.1. The parts punched out by means of the activated punch 9 fall out downward via the waste strip 2.5 and the waste channel 2.6. The movable upper tool part is guided in guides 2.8 with respect to the stationary lower tool part and is designed, for example, for stroke frequencies of at least 140 strokes per minute. The punching bar 2.3 has several punching punches 9 both in the feed direction 26 of the U-shaped profile 4 and transversely thereto, as can be seen, for example, from FIG. The punches are arranged with respect to one another and have suitable diameters so that the majority of the holes required for the entire hole pattern can be produced with them. For frame girders with a different hole pattern, however, a different punch bar 2.2 will often be required because, for example, a different spacing of the hole tracks and / or holes with different diameters are required. The activation bar 2.2, on the other hand, is designed in such a way that different punches 9, in particular punches that differ in their diameter, can be activated with one and the same activation unit 18, as can be seen, for example, from FIGS. 17, 19 and 20a. In addition to different diameters of the punching punches, a change in position of the punching punch 9 with respect to the activation unit 18 is also possible to a certain extent, as shown in FIG. 19. This is made possible by the fact that the activation unit 18 in the activation bar 2.2 has an increased width in comparison to the punching die. This has the further advantage that when retrofitting the die bar 2.3 and the associated die bar 2.4 it may not be necessary to replace the activation bar 2.2, which reduces the changeover times and material costs accordingly. At the same time, tool maintenance effort and costs are reduced. In Fig. 20a and Fig. 20b two further embodiments are shown in which only the punch bar 2.3 'with associated die bar 2.4' (Fig. 20a) or the die bar 2.3 "and the associated die bar 2.4" (Fig. 20b) are exchanged while using the same activation bar 2.2 and waste bar 2.5.

Claims

Patent claims:

1. A method for producing frame side members for commercial vehicles with at least one forming process and at least one punching process, with a hole pattern consisting of a plurality of holes (7a, 7b, 8a-8c) being punched during the punching process and at least two series of frame side members being produced which differ from one another at least in their hole pattern, characterized in that a group of holes punching device (2) with a plurality of punching punches (9) is used to punch at least a large part of the holes of the hole pattern to be punched in a frame longitudinal member, the punching punches (9) can be individually activated or deactivated in each punching process depending on the hole pattern to be generated, so that in each punching process a number of holes (7a, 7b, 8a-8c) corresponding to the number of activated punches (9) is punched simultaneously and the majority or the entirety the holes of the hole pattern to be punched in the frame length gsträgers is generated by a large number of punching processes of the hole group punching device (2).

2. The method according to claim 1, characterized in that the hole group punching device (2) operates as a mechanical hole group punching device (2) with a stroke frequency of at least 50 strokes per minute.

3. The method according to claim 1, characterized in that at least 70%, preferably at least 80%, most preferably at least 90% of all holes (7a, 7b, 8a-8c) of the hole pattern to be punched are punched with the hole group punching device (2).

4. The method according to claim 1, characterized in that before or after punching the holes (7a, 7b, 8a-8c) in the hole group punching device (2) at least one further separating or cutting process for generating at least another closed contour is carried out to complete the hole pattern to be punched.

5. The method according to claim 4, characterized in that each hole pattern on

The basis of a control data record is generated which includes all holes (7a, 7b, 8a-8c) that can be punched with the hole group punching unit (2)

Punching process with the hole group punching unit (2) and assigns the remaining holes to the further separating or cutting process.

6. The method according to claim 1, characterized in that during the forming process a U-shaped profile (4) is made from a sheet metal strip (5a) or from a sheet metal blank (5b) by roll profiling or die bending.

7. The method according to claim 1, characterized in that a plurality of holes (7a, 7b, 8a-8c) of the punched hole pattern adjacent in the longitudinal direction of the frame side member and / or a plurality of holes adjacent in the transverse direction of the frame side member have different distances from one another.

8. The method according to claim 1, characterized in that all by the

Hole group punching device (2) produced holes (7a, 7b, 8a-8c) are punched on hole tracks (6a, 6b, 6c) which run parallel to one another and extend in the longitudinal direction of the frame side member.

9. The method according to claim 8, characterized in that holes (7a, 7b, 8a-8c) with different diameters are punched on at least one of the hole tracks (6a, 6b, 6c).

10. The method according to claim 1, characterized in that the holes to be punched (7a, 7b, 8a-8c) are introduced into a component, the position of the component relative to the hole group punching device (2) being determined via a measuring device and a Misalignment is corrected by means of a positioning unit (14, 16, 17).

11. The method according to claim 1, characterized in that with each punching process of the hole group punching device (2) a longitudinal section of the hole pattern to be punched is punched and the holes (7a, 7b, 8a-8c) to be punched in each longitudinal section are stored in a control data record are, the punches (9) being activated or deactivated individually for each punching process with the aid of the control data set.

12. The method according to claim 1, characterized in that the hole group punching device (2) punches all holes (7a, 7b, 8a-8c) associated with the hole group punching device (2) of a longitudinal section of the hole pattern to be punched and the position of the holes (7a, 7b, 8a-8c) in the subsequent longitudinal section is set by controlled feed.

13. Plant for the production of at least two series of frame side members for commercial vehicles with a forming device (1) for producing a U-shaped profile (4) from a sheet metal strip (5a) or from a sheet metal plate (5b) and at least one punching device for punching one out a plurality of holes (7a, 7b, 8a-8c) existing hole pattern, wherein the at least two series of frame longitudinal members differ from one another at least in their hole pattern, characterized in that the at least one punching device by a hole group punching device (2) with a plurality is formed by punching punches (9), the punches (9) being individually activatable or deactivatable by means of an activation unit (18) for each punching process depending on the hole pattern to be generated, so that a number corresponding to the number of activated punches (9) for each punching process at holes (7a, 7b, 8a-8c) is punched at the same time, wherein the plurality of punch punch (9) is arranged in such a way that at least a large part of the holes (7a, 7b, 8a-8c) of the hole pattern to be punched can be produced by a large number of punching processes.

14. System according to claim 13, characterized in that a cutting or cutting device (3) connected upstream or downstream of the hole group punching device (2) is also provided for generating at least one further closed contour, so that the hole pattern to be punched is made up of holes ( 7a, 7b, 8a-8c) of the hole group punching device (2) and the at least one further closed contour of the separating or cutting device (3).

15. Plant according to claim 13, characterized in that the

The forming device (1), the hole group punching device (2) and the separating or cutting device (3) are formed by separate modules which can be arranged in any order in relation to one another.

16. System according to claim 13, characterized in that the hole group punching device (2) has at least a first and a second type of punching punches (9) which differ in diameter.

17. Plant according to claim 13, characterized by a measuring device for

Determination of the position of a component to be punched relative to the hole group punching device (2) and a positioning unit (11, 14, 17) for correcting the component to be punched in the case of one determined by the measuring device

Misalignment.

18. Plant according to claim 13, characterized in that the group of holes punching device (2) has at least one tool unit which is made up of an upper tool part and a lower tool part, the upper tool part in turn having an activation bar (2.2) and a stamp bar (2.3) and the lower tool part is composed of a die bar (2.4) and a waste bar (2.5).

19. Plant according to claim 18, characterized in that in the stamp bar

(2.3) the plurality of punches (9) are performed and the

Activation units (18) for each punch (9) in the activation bar (2.2) are arranged and to activate or deactivate the individual punch (9) are in operative connection with them.