EP2839897B1 - Punching assembly and its use - Google Patents

Description

The invention relates to a punching arrangement with a punch and a holding plate for the punch and its use.

Punching dies are used in so-called "prog dies" and "progressive presses". These types of tools work as kits with possibly several sister tools in high pressure punch presses. Main field of application of such punches is the automotive industry, in particular the construction of chassis and body.

Punches of this type are known from z. B. US 3494033 A ,

Such a "prog die" small to medium size has external dimensions of about 1 600 mm x 1 200 mm, with a variety of dies, for example, about 20 mold punches. Here, punches are usually arranged spatially close together, surrounded by piping, which serve to monitor the pressures of built-in gas springs by means built-in pressure gauge.

Due to the ever-advancing use of high-strength sheets in the automotive industry, the required punching pressures and thus also the stripping forces that act on the punch and its anchoring in its plate during Rückzugss- and thus stripping process. For the "Prog Die", a maximum load of this stripping force of approx. 100 kN (10 t) per forming punch can be assumed. This is based on a punching force of 1,000 kN (100 t). A stamping and receiving system to be designed for this application must be able to absorb these tensile forces during retraction or stripping operation with appropriate safety devices.

A significantly reduced service life of the arrangement results when a play-bearing storage of the punch in the holding plate during retraction or stripping is recorded. In this case, very high bending and gravitational forces act on the connection between the punch and the retaining plate.

Furthermore, consideration must be given to the space available in the tool. It must be possible to change the punches in the cramped, due to the arrangement, lateral work space can. In particular, this should be possible quickly and without removal of the holding plate in case of wear or stamp breakage.

Object of the present invention is to provide a punching arrangement in which the service life of the arrangement is significantly high due to a play-free storage of the punch in the holding plate during the retraction or stripping.

The object is achieved by a punching arrangement, which is formed according to the features of claim 1.

• eine in den Stempelkopf eingebrachte Tasche,
• eine in eine Gewindebohrung der Halteplatte eingeschraubte Spannschraube,
• ein in Achsrichtung der Spannschraube zwischen dieser und der Tasche angeordnetes Druckstück,
• eine Halteschraube für das Druckstück, wobei die Halteschraube eine Bohrung der Spannschraube durchsetzt und mit einem Gewindeabschnitt in eine Gewindebohrung des Druckstücks geschraubt ist.

The punching arrangement according to the invention has a punch and a holding plate for the punch, wherein the punch contacts the holding plate or a pressure plate arranged between the punch and the holding plate during a punching stroke in the region of a punch shoulder. The punch has a punch head and the holding plate has a receptacle for the stamp head. There are further provided means for attaching the stamp head to the support plate. These agents are according to the invention:

• a pocket introduced into the stamp head,
• a clamping screw screwed into a threaded bore of the retaining plate,
• an in the axial direction of the clamping screw between the latter and the pocket arranged pressure piece,
• a retaining screw for the pressure piece, wherein the retaining screw passes through a bore of the clamping screw and is screwed with a threaded portion in a threaded bore of the pressure piece.

Here, in a screwed-in position of the clamping screw, on a side of the pocket facing away from the shoulder, a conical section of the pressure piece contacts a conical section of the pocket in a planar manner. In this screwed-in position of the clamping screw, the punch shoulder bears against the retaining plate or pressure plate and a screw head of the retaining screw with axial clearance relative to the clamping screw is arranged.

In this embodiment of the punching arrangement, in particular the means for attaching the punch head to the holding plate, it is ensured that the punch with its punch shoulder is biased backlash against the holding plate or the pressure plate. During the punching stroke, it is thus ensured that the punching forces are transmitted between the punch shoulder and the holding plate or punch shoulder and pressure plate. The punching pressure is thus not absorbed by the pressure piece. Relative to the return stroke or stripping operation of the punch, this has the consequence that the holding plate and the punch are moved without play, because this backlash is guaranteed by the inventive design and arrangement of the pressure piece. There is thus no play-afflicted connection between the holding plate and punches available or it is ensured that no loose connection between the holding plate and punch sets. Such a loose connection, which causes a non-precise guidance of the punch, would have the consequence that the punch on the return stroke or stripping deformed or damaged the punched sheet. Apart from this, such a play-related connection leads to an increased mechanical stress on the connection area of the holding plate and punch, with the consequence of a shorter service life. In particular, there is a risk that the punch breaks in the area of the punch head.

Since the pressure piece does not contact a recess in the stamp head, which completely penetrates the stamp head, but rather a pocket is provided in the stamp head, increased forces can be transmitted via the stamp head during the return stroke or stripping operation.

In the punching arrangement according to the invention can be by means of the clamping screw on the pressure piece such a bias between punch shoulder and plate or pressure plate produce, which guarantees that the punch still stuck to a theoretically possible setting process and thus no play between punch shoulder and plate or pressure plate can.

So that the punch can be dismantled, it is necessary to pull the jammed in the bag pressure piece out of the bag. This is due to the inventively provided compound that produces the retaining screw between the clamping screw and the pressure piece. If the clamping screw is rotated in the unscrewing, this leads to the fact that the axial play between the screw head in the retaining screw and the clamping screw is reduced until the screw head of the retaining screw rests against the clamping screw and then further unscrewing the clamping screw due to the positive connection between the screw head Retaining screw and the clamping screw, the pressure piece is moved with, from the clamping position with respect to the bag.

Preferably means are provided for aligning the pressure piece in a direction of rotation of the pressure piece relative to the conical portion of the pocket. As a result, a loose pre-centering of the pressure piece is ensured, which can be easily ensured that when delivering the clamping screw of the conical portion of the pressure piece contacted the conical portion of the bag surface.

According to a particular embodiment, it is provided that the described arrangement for holding the punch in the holding plate is provided twice. Thus, two pockets are introduced into the stamp head and it interacts with the respective pocket a pressure piece and with the pressure piece a clamping screw and a retaining screw together. In this respect, reference is made to the above statements. In this case, in particular, these pockets are formed identically, further formed this clamping screws identical, further designed this pressure pieces identical and finally formed this holding screws identical.

The punching arrangement according to the invention is used in particular in a "punching and / or pressing tools having" Prog

The "or step press with a stripping force> 50 kN, especially in a transfer press with a stripping force of up to 100 kN.

Further features of the punching arrangement according to the invention are shown in the dependent claims, the drawings of the figures and the description of the figures, it being noted that all individual features and all combinations of individual features are essential to the invention.

In the figures, the invention is illustrated with reference to two preferred embodiments when used in a "Prog Die", without being limited to these embodiments and uses.

Fig. 1

für die erste Ausführungsform eine Draufansicht einer "Prog Die", die mit einer Vielzahl von Formstempeln bestückt ist, von denen drei erfindungsgemäße Stanzanordnungen sind,

Fig. 2

die erfindungsgemäße Stanzanordnung in einer räumlichen Ansicht,

Fig. 3

die Stanzanordnung gemäß Fig. 2 in einer Explosionsdarstellung,

Fig. 4

die Stanzanordnung gemäß Fig. 2 in einer Ansicht IV in Fig. 5,

Fig. 5

die Stanzanordnung in einer Ansicht V in Fig. 4,

Fig. 6

einen Schnitt durch die Stanzanordnung gemäß der Linie VI-VI in Fig. 4,

Fig. 7

den Bereich A gemäß Fig. 6 in vergrößerter Darstellung, wobei in der Fig. 7 ein Druckstück der Stanzanordnung in dessen Spannstellung veranschaulicht ist,

Fig. 8

einen Schnitt gemäß Fig. 7, veranschaulicht bei aus einer Tasche heraus bewegtem Druckstück der Stanzanordnung,

Fig. 9

eine Halteplatte der Stanzanordnung in einer räumlichen Ansicht,

Fig. 10

die Halteplatte in einer Ansicht X gemäß Fig. 11,

Fig. 11

die Halteplatte in einer Ansicht XI gemäß Fig. 10,

Fig. 12

die Halteplatte in einer Ansicht XII gemäß Fig. 11,

Fig. 13

einen Stanzstempel der Stanzanordnung in einer räumlichen Ansicht,

Fig. 14

den Stanzstempel in einer Ansicht XIV gemäß Fig. 15,

Fig. 15

den Stanzstempel in einer Ansicht XV gemäß Fig. 14,

Fig. 16

den Stanzstempel in einer Ansicht XVI gemäß Fig. 14,

Fig. 17

den Bereich B gemäß Fig. 15 in vergrößerter Darstellung,

Fig. 18

die aus einer Spannschraube, dem Druckstück und einer Halteschraube gebildete Funktionseinheit in einer räumlichen Darstellung,

Fig. 19

die Funktionseinheit in einer Ansicht XIX gemäß Fig. 20,

Fig. 20

die Funktionseinheit in einer Ansicht XX gemäß Fig. 19,

Fig. 21

die Halteschraube in einer räumlichen Ansicht,

Fig. 22

die Halteschraube in einer Ansicht XXII gemäß Fig. 23,

Fig. 23

die Halteschraube in einer Ansicht XXIII gemäß Fig. 22,

Fig. 24

die Spannschraube in einer räumlichen Ansicht,

Fig. 25

die Spannschraube in einer Ansicht XXV gemäß Fig. 26,

Fig. 26

die Spannschraube in einer Ansicht XXVI gemäß Fig. 25,

Fig. 27

das Druckstück in einer räumlichen Ansicht,

Fig. 28

das Druckstück in einer Ansicht XXVIII gemäß Fig. 29,

Fig. 29

das Druckstück in einer Ansicht XXIX gemäß Fig. 28,

Fig. 30

für eine zweite Ausführungsform eine modifizierte Stanzanordnung in einer Schnittdarstellung gemäß Fig. 7,

Fig. 31

in einer räumlichen Ansicht das in Fig. 30 gezeigte Druckstück.

It shows:

Fig. 1

for the first embodiment, a top view of a "prog die" equipped with a plurality of dies, three of which are punch assemblies according to the invention,

Fig. 2

the punching arrangement according to the invention in a three-dimensional view,

Fig. 3

the punching arrangement according to Fig. 2 in an exploded view,

Fig. 4

the punching arrangement according to Fig. 2 in a view IV in Fig. 5 .

Fig. 5

the punching arrangement in a view V in Fig. 4 .

Fig. 6

a section through the punching arrangement according to the line VI-VI in Fig. 4 .

Fig. 7

the area A according to Fig. 6 in an enlarged view, wherein in the Fig. 7 a pressure piece of the punching arrangement is illustrated in its clamping position,

Fig. 8

a section according to Fig. 7 , illustrated with out of a pocket moving pressure piece of the punching arrangement,

Fig. 9

a holding plate of the punching arrangement in a three-dimensional view,

Fig. 10

the holding plate in a view X according to Fig. 11 .

Fig. 11

the holding plate in a view XI according to Fig. 10 .

Fig. 12

the holding plate in a view XII according to Fig. 11 .

Fig. 13

a punch of the punching arrangement in a spatial view,

Fig. 14

the punch in a view XIV according to Fig. 15 .

Fig. 15

the punch in a view XV according to Fig. 14 .

Fig. 16

the punch in a view XVI according to Fig. 14 .

Fig. 17

the area B according to Fig. 15 in an enlarged view,

Fig. 18

the functional unit formed from a clamping screw, the pressure piece and a retaining screw in a spatial representation,

Fig. 19

the functional unit in a view XIX according to Fig. 20 .

Fig. 20

the functional unit in a view XX according to Fig. 19 .

Fig. 21

the retaining screw in a spatial view,

Fig. 22

the retaining screw in a view XXII according to Fig. 23 .

Fig. 23

the retaining screw in a view XXIII according to Fig. 22 .

Fig. 24

the clamping screw in a spatial view,

Fig. 25

the clamping screw in a view XXV according to Fig. 26 .

Fig. 26

the clamping screw in a view XXVI according to Fig. 25 .

Fig. 27

the pressure piece in a spatial view,

Fig. 28

the pressure piece in a view XXVIII according to Fig. 29 .

Fig. 29

the pressure piece in a view XXIX according to Fig. 28 .

Fig. 30

for a second embodiment, a modified punching arrangement in a sectional view according to Fig. 7 .

Fig. 31

in a spatial view the in Fig. 30 shown pressure piece.

figure description

Fig. 1 shows the top of a "prog die" punching unit 1, which is provided with a plurality of dies, specifically eighteen dies. These are stored in a common unit, which has dimensions of approx. 1,600 x 1,200 mm for small to medium size. This punching unit 1 is mainly used in the automotive industry, especially in the production of chassis and body.

Of the Fig. 1 It can be seen that the eighteen forming dies are arranged spatially close together, surrounded by pipes 3, for monitoring the pressures of built-in gas springs 4 are used by built-in pressure gauge in the tool.

Three of the forming dies used in the punching unit 1 are designed according to the punching arrangement 2 according to the invention.

This punch assembly 2 according to the first embodiment is in the Fig. 2 to 29 illustrated.

The punching arrangement 2 has a punch 5 and a holding plate 6 for the punch 5. The punch 5 has a stamp part 7, by means of which the actual punching takes place, furthermore a punch head 8 connected to the stamp part 7. The stamp head 8 is plate-shaped. On the side facing the stamp head 8, the stamp member 7 has a punch shoulder 9.

Between the punch 5, specifically the punch shoulder 9, and the holding plate 6, a pressure plate 10 is arranged. The pressure plate 10 has a this passing through slot 11. On both sides of the oblong hole, the pressure plate is provided with recesses for receiving screws 12, wherein the unillustrated heads of these screws 12 are recessed in the region of the underside of the pressure plate 10. By means of these screws 12, the pressure plate 10 is fixed to the underside of the retaining plate 6, specifically screwed into located there threaded holes 13. The slot 11 has such dimensions that the punch head 8 passes through the pressure plate 10 with little play in the two space coordinates running perpendicular to the insertion direction of the punch head 2.

As seen in the punching direction, the holding plate 6, the pressure plate 10 and the stamping part 7 have an identical cross-sectional shape, namely in the form of a rectangle with bevelled corners. The areas seen in the punching direction of holding plate 6 and pressure plate 10 are the same, while the surface of the stamp member 7 is lower in this direction.

The holding plate 6 has in the region of the four corners holes for receiving screws 14, wherein the respective screw head is recessed on the pressure plate 10 facing side of the holding plate 6 in a recess. By means of these screws 14, the holding plate 6 is connected to a base plate 15 of the punching unit 1. Two mounted in the support plate 6 pin 16 serve to guide the support plate 6 in positioning the support plate 6 with respect to the base plate 15. Accordingly, the base plate 15 is not only provided with threaded holes for screwing the screws 14, but also with receptacles for inserting the pin 16.

The holding plate 6 has two receptacles 17 and a web 18 arranged between them. Here, the receptacles 17 pass through the holding plate 6, while the web 18 extends only about half the thickness of the holding plate 6, in the region of the holding plate 6, which faces away from the pressure plate 10. Accordingly, the stamp head 8 on two head portions 19, between which a recess 20 is formed. The respective head portion 19 is inserted into a receptacle 17 associated therewith. In this case, the web 18 passes through the recess 20. Consequently, the punch 5 is positioned in the two coordinate directions perpendicular to the punching largely free of play in the receptacles 17 of the support plate 6 and aligned with respect to the web 18 of the support plate 6 in the region of the punch head 8.

In the inserted into the holding plate 6 position of the punch 5, in which the punch 5 passes through the pressure plate 10 with the punch head 8 and the pressure plate 10 is screwed to the support plate 6 and this is bolted to the base plate 15 of the punching unit 1, form the mentioned Components a functional unit. Here, the punch 5 is in the punching direction without play on the pressure plate 10 in the region of the punch shoulder 9 at.

Due to the described arrangement, the punch 5 can be dismantled or replaced without disassembly of the pressure plate 10 with respect to the support plate 6 is required.

Held the punch 5 in the holding plate 6 by means twice provided for attaching the punch head 8 to the holding plate 6. The respective means 21 has a introduced into the punch head 8 pocket 22, a screwed into a threaded bore 23 of the support plate 6 clamping screw 24, a in the axial direction of the clamping screw 24 between this and the pocket 22 arranged pressure piece 25 and a retaining screw 26 for the pressure piece 25 on. The retaining screw 26 passes through a bore 27 of the clamping screw 24 and is screwed with a threaded portion 28 in a threaded bore 29 of the pressure piece 25. In a screwed-in position of the clamping screw 24, on a side facing away from the punch shoulder 9 side 30 of the pocket 22, contacted a conical portion 31 of the pressure piece 25 a conical portion 32 of the bag 22 areally. In this in Fig. 7 illustrated in detail screwed position of the clamping screw 24 is the punch shoulder 9 on the pressure plate 10 flat. Here, a screw head 33 of the retaining screw 26 with axial play, illustrated by the gap 34, with respect to the clamping screw 24 is arranged.

In detail, the bag 22 remote from the end of the pressure piece 25 as a rotationally symmetrical cylinder 35 and the bag 22 facing the end of the pressure piece 25 is formed as a truncated cone 46. A jacket region of the truncated cone 46 has a flat contact surface 36 in the region of its free end for the purpose of making contact with the pocket 22. The pocket 22 is designed as a truncated cone recess tapering in the direction of a bottom 37 of the pocket 22 with a planar contact surface 38 arranged at least in a jacket region of the truncated cone for surface contact with the contact surface 36 of the pressure element 22. Here, the pocket 22, thus the truncated cone recess on an oval, in particular slightly oval cross-section. The extension of the pocket 22 transversely to the punching direction of the punch 5 or in its withdrawal direction is less than the extension of the pocket 22 perpendicular to this direction. This allows a certain tolerance compensation in transverse extent, thus in the direction of the distance of the two pockets 22 in terms of manufacturing inaccuracies.

For the sole reason of the simplified production, a surface 39 is also provided on the conical part of the pressure piece 25 in the diametrical area as well.

The pressure piece 22 is, in particular the Fig. 7 can be seen in the screwed position of the clamping screw 24 is arranged at a distance from the bottom 37 of the bag. The clamping screw 24 has a screw head 40 with an outer polygon, which is designed as a hexagon. In the screwed-in position of the clamping screw 24, the screw head 40 protrudes beyond the holding plate 6, so that, without considerable space being required next to the punching arrangement 2, a simple actuation of the screw head 40 by means of a screwing tool is possible. The retaining screw 26 has a screw head with an internal polygon, in particular hexagon, wherein the screw head 41 is disposed within the clamping screw 24.

Fig. 2 shows the one clamping screw 24 in its screwed position (corresponding to Fig. 7 ) and the other clamping screw 24 in a partially unscrewed position (corresponding Fig. 8 ).

In the punching arrangement 2, two pockets 22 are thus introduced into the punch head 8 and it interacts with the respective pocket 22, a pressure piece 25 and with the pressure piece 25, a clamping screw 24 and a retaining screw 26 together. The pockets 22 are identical, just as the clamping screws 24 are identical, the pressure pieces 25 are formed identically and the retaining screws 26 formed identical.

In the punching arrangement 2 according to the invention, the punch 5 is inserted through the pressure plate 10 and screwed to the holding plate 6. The exact positioning is done by two fits in the X and Y direction. Secured against pulling in the Z direction of the punch 5 by the two means 21. This type of fuse or attachment allows quick change of the punch 5. In the tensioned state, in particular in Fig. 7 is illustrated, the respective pressure piece 25 abuts against the end face of the clamping screw 24 and is pressed on the external thread in the, corresponding to the geometry of the pressure piece 25 milled in the punch head 8. About the slope at the end of the pressure piece 25, the punch shoulder 9 is pulled against the pressure plate 10 by means of the counter-slope in the punch head 8, so that the punch 5 by means of the two provided means 21 with bias against the pressure plate 10, which can then take the punching pressure against the Punching direction can be pressed.

To remove the punch 5 in the punching direction, the respective clamping screw 24 is released and after contact of the lower part of the screw head 41 of the retaining screw 26 for the pressure piece 25 with the recess in the clamping screw 24, the pressure piece 25 is pulled by means of the retaining screw 26 from the milled recess in the punch head 8 , The pressure piece 25 are at further rotations of the clamping screw 24, the punch 5, specifically the punch head 8 free after the pressure piece 25 is completely moved out of the punch head 8.

Another function of the clamping screws 24 is the recording of Abstreifdrucks after punching when the punch 5 leaves the punched sheet in the direction of top dead center. This is done by the contact pressure of the respective head portion 19 to the opposite wall of the receptacle 17 of the holding plate 6 by means of the clamping screws 24 and by the shear resistance of the cross section of the engaged pressure pieces 25th

The forces occurring during stripping after punching can be up to 100 kN.

The use of several clamping screws, in this case the two clamping screws 24, allows tight tolerance fields to dominate both in the series arrangement of the clamping screw thread in the holding plate 6, as well as the milled cuts in the punch head 8 by the bevels in the milled recess in the punch head 8 as well as the front part the pressure piece 25 are compensated without a clamping screw 24 is impaired in their function of pressing the punch shoulder 9.

The clamping screw 24 is, for example, a screw M 16, in the retaining screw 26 by a screw M 4. The pressure piece, for example, has a diameter of 13 mm, wherein the conical portion 31 extends at an angle of 5 ° to the pocket axis. The oval conical pocket 22 has, for example, dimensions of 14 mm / 12 mm at a depth of 6 mm.

The second embodiment according to the FIGS. 30 and 31 differs from the first embodiment only in terms of the formation of the pressure piece 25 and means for loose pre-centering of the pressure piece 25. In so far, to avoid repetition, reference is made to the basic comments on the first embodiment.

In the second embodiment according to the FIGS. 30 and 31 is the cylindrical portion 35 of the pressure piece with an axially extending, radially outwardly open groove 42 is provided. The groove 42 is arranged such that the extension of the groove 42 coincides with a symmetry line of the contact surface 36, so that alignment of the groove 42 a corresponding orientation of the contact surface 36 corresponds. With the groove 42, a threaded pin 43 cooperates, the Has a pin 44 in the region of its end facing the pressure piece 25. The diameter of the pin 44 is slightly smaller than the width of the groove 42. The threaded pin 43 is screwed into a threaded bore 45 of the retaining plate 6. The threaded pin 43 with pin 44 allows loose pre-centering of the pressure piece 25. This can be ensured in a simple manner that when screwing the clamping screw 24, the pressure piece 25 is aligned exactly in the region of its contact surface 36 with respect to the conical portion 32 in the pocket 22 ,

During pre-assembly of the holding plate 6, the respective pressure piece 25 is aligned once with its groove 42 and screwed the threaded pin 43 so far that its pin 44 engages in the groove 42 without a tension between the pin 44 and pressure piece 25 takes place. Thus, the pressure piece 25 is fixed with play. Neither on the groove 42 nor on the turned-end of the threaded pin 43, thus the pin 44, a burden, since the threading of the surfaces of the pressure piece 25 in the associated pocket 22 in the holding plate 6, the function of pre-centering is met.

Claims (15)

1. Punching arrangement (2) having a punching die (5) and a holding plate (6) for the punching die (5), the punching die (5) making contact in the case of a punching stroke in the region of a die shoulder (9) with the holding plate (6) or a pressure plate (10) which is arranged between the punching die (5) and the holding plate (6), and the punching die (5) having a die head (8) and the holding plate (6) having a receptacle (17) for the die head (8), and means (21) being provided for fastening the die head (8) to the holding plate (6), characterized by the means (21) having:

   - a pocket (22) which is made in the die head (8),

   - a clamping screw (24) which is screwed into a threaded hole (23) of the holding plate (6),

   - a pressure piece (25) which is arranged between the clamping screw (24) and the pocket (22) in the axial direction of the said clamping screw (24),

   - a holding screw (26) for the pressure piece (25), the holding screw (26) penetrating a hole (27) of the clamping screw (24) and being screwed with a threaded section (28) into a threaded hole (29) of the pressure piece (25),
   a conical section (31) of the pressure piece (25) making full-surface contact, in a screwed-in position of the clamping screw (24), with a conical section (32) of the pocket (22) on a side (30) of the pocket (22) which faces away from the die shoulder (9), and the die shoulder (9) bearing against the holding plate (6) or the pressure plate (10) in the said screwed-in position of the clamping screw (24), and a screw head (41) of the holding screw (36) being arranged with axial play (34) with regard to the clamping screw (24).
2. Punching arrangement according to Claim 1, that end of the pressure piece (25) which faces the pocket (22) being of frustoconical configuration, and a peripheral region which is situated there having a flattened contact face (36) in the region of its free end for the purpose of contact with the pocket (22).
3. Punching arrangement according to Claim 1 or 2, the pocket (22) being configured as a frustoconical recess which tapers in the direction of a bottom (27) in the pocket (22) with at least one contact face (32) which is arranged in a peripheral region of the truncated cone for the purpose of contact, in particular full-surface contact with the pressure piece (25).
4. Punching arrangement according to Claim 3, the frustoconical recess having an oval cross section.
5. Punching arrangement according to one of Claims 1 to 4, the pressure piece (25) being arranged at a spacing from the bottom (27) of the pocket (22) in the screwed-in position of the clamping screw (24).
6. Punching arrangement according to one of Claims 1 to 5, means (42, 44) being provided for orienting the pressure piece (25) in a rotational direction of the pressure piece (25) relative to the conical section (32) of the pocket (22).
7. Punching arrangement according to one of Claims 1 to 6, the clamping screw (24) having a screw head (40) with an external polygon, in particular a hexagon, for interaction with a screwdriver.
8. Punching arrangement according to one of Claims 1 to 7, the screw head (40) of the clamping screw (24) protruding beyond the holding plate (6) in the screwed-in position of the clamping screw (24).
9. Punching arrangement according to one of Claims 1 to 8, the holding screw (26) having a screw head (41) with an internal polygon, in particular a hexagon, the screw head (41) being arranged within the clamping screw (24).
10. Punching arrangement according to one of Claims 1 to 9, the pressure plate (10) being connected to the holding plate (6) and being provided with a slot (11) which is penetrated by the die head (8).
11. Punching arrangement according to one of Claims 1 to 10, two pockets (22) being made in the die head (8), and a pressure piece (25) interacting with the respective pocket (22) and a clamping screw (24) and a holding screw (26) interacting with the pressure piece (25).
12. Punching arrangement according to Claim 11, the pockets (22) being of identical configuration, the clamping screws (24) being of identical configuration, the pressure pieces (25) being of identical configuration and the holding screws (26) being of identical configuration.
13. Punching arrangement according to one of Claims 1 to 12, the holding plate (6) having two receptacles (17) and the die head (8) having two head sections (19), the respective head section (19) being plugged into a receptacle (17) and each head section (19) having a pocket (22).
14. Punching arrangement according to one of Claims 1 to 13, the die head (8) being guided in the holding plate (6) in the spatial directions which are arranged perpendicularly with respect to the plug-in direction into the holding plate (6).
15. Use of the punching arrangement (2) according to one or more of Claims 1 to 14 in a punching unit (1), in particular in a progressive press or "prog die", with a stripping force per punching die (5) of greater than 50 kN, in particular a stripping force of up to 100 kN.

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