EP2764933A1 - Tool system with exchangeable tool inserts for punching machines - Google Patents

Abstract

The adapter (1) has a mounting device for accommodating the stamp adapter in a stamp shaft. A stamp receptacle (6) includes an opening with a central axis (8) extending parallel to and separate from another central axis (2). A circular cylindrical counterbore and a circular cylindrical through-hole (7) through which the former central axis extends are provided. The counterbore is not rotationally symmetrical with respect to the former central axis. The counterbore comprises radial orientated cylindrical recesses that are not rotationally symmetrical with respect to the former central axis. An independent claim is also included for a tool system with a tool lower portion comprising a die adapter having two die receptacles.

Description

The invention relates to a tool system with interchangeable tool inserts for punching machines, in particular a modular system for low-arm punching.

For the process-reliable and high-quality processing of plate-shaped components, in particular sheet metal, on punching machines, sharp punching tools are required. With blunt tools burr formation increases and the required cutting force increases. For this reason, it is necessary to regrind blunt punches. To compensate for the change in length of the reground punch, there is a system of multi-part punching tools consisting of a punch shaft which is suitable for several different punches, a respective centrally located in the punch shaft punch, which is reground, and insert discs. The inserts in different thicknesses are optionally inserted in the required number to compensate for the change in length of the punch due to the regrinding, whereby a regrinding length is created.

By this functional subdivision of the tool can at a consumption of this regrinding length, ie if the length of the punch insert was reduced by regrinding so that it can not be compensated by inserting discs, only the punch insert can be replaced without having to replace the punch shaft ,

Furthermore, it is also possible in principle to use punch inserts in different shapes or sizes with a punch shaft.

By using this system, an economical use of stamping tools is made possible.

For the economic processing of sheets on punching machines a large number of tool sets is required because punching should be made as possible with a punching stroke and therefore for the different contours each own stamp is required. For the processing of sheets in different thicknesses, dies of different sizes are required for each stamp, depending on the sheet thickness. This results in an effort to pre-equip, i. the composition of the tool sets, and for preparing the punching machine, i. for inserting the tool sets in the tool magazine of the punching machine, as well as increased demands on the size of the tool magazines.

For this reason, punching tools are used in which punching or machining inserts are not included in the central axis of the tool, and in which by the rotation of the tool shell to the tool base, the assignment of a die of a certain size to the punch insert in the tool shell can be changed , The feasible with the tool set operation can thus be performed at different sheet thicknesses, without retrofitting the tool. Thus, a so-called low-arm punching is possible.

Thus, the low-arm punching results in the problem that, although the same eccentric punch can be used for producing a specific punch-out for different sheet thicknesses, but at a wear of the punch and stamp in different contours or sizes, each of the corresponding tool shells must be made consuming with off-center punches.

This results in the task of creating a tooling system that allows economical use in low-arm punching.

The object is achieved by means of a stamp adapter with the features according to claim 1, a tool upper part with the features according to claim 10, and a tool system with the features according to claim 13.

The invention will be explained with the aid of the attached drawings. Further developments of the invention are described in the respective dependent claims.

Fig. 1

zeigt eine perspektivische Darstellung eines Stempeladapters;

Fig. 2

zeigt einen Stempelschaft in einer perspektivischen Darstellung;

Fig. 3

ist eine Schnittdarstellung eines Werkzeugoberteils mit einem Stempelschaft, einem Stempeladapter und einem Werkzeugeinsatz;

Fig. 4

stellt einen Matrizenadapter dar;

Fig. 5

zeigt die prinzipielle Darstellung eines Werkzeugsatzes zum rüstarmen Stanzen.

The claimed articles offer the possibility, by forming as a suitable adapter and as a tool shell, and the use in one system, to flexibly use and exchange already existing machining inserts.

Fig. 1

shows a perspective view of a stamp adapter;

Fig. 2

shows a stamp shaft in a perspective view;

Fig. 3

is a sectional view of a tool shell with a punch shaft, a punch adapter and a tool insert;

Fig. 4

represents a die adapter;

Fig. 5

shows the basic representation of a tool set for low-arm punching.

In Fig. 1 is a stamp adapter 1 shown in a perspective view. The stamp adapter 1 is formed as a substantially disk-shaped circular body having a first central axis 2. On the upper side, the stamp adapter 1 in the center on a receiving device 3 for receiving in a stamp shank shown later.

The receiving device 3 has a round cylindrical elevation whose axis corresponds to the first center axis 2. At the transition from the circumferential surface in the axial direction to the end face radially to the central axis 2, a circumferential chamfer is provided. The receiving device 3 is hollow by a bore and has a thread 4 on the circumference of the bore. Furthermore, extending on the upper side of the disc-shaped body to the central axis 2 radial, substantially cuboidal rod-like increase. 5

The disc-shaped body is provided with a punch holder with a first expression for receiving tool inserts 6 from a first tool system. The first punch holder 6 has a circular cylindrical through-hole 7 with a second center axis 8 at a distance a from the first center axis 2. Around the second central axis 8, the disc-shaped body has a cylindrical countersink 9 from its upper side. The counterbore 9 has a sector with an inner circumferential surface 10 which is circular with respect to the second central axis 8, and a sector in which the inner surface 11 is parallel to a tangent to the throughbore 7. Of the Distance between the tangential inner surface 11 and the second central axis 8 is greater than the radius of the through hole 7 and smaller than the radius of the circular sector whose reduction. 9

In an alternative embodiment, the disc-shaped body is provided with a plurality of first punch receivers 6, all of which have the same distance a between the first center axis 2 and the second center axis 8.

Furthermore, the disk-shaped body is provided with a punch holder 12 with a second expression. The punch holder 12 has a circular cylindrical through-bore 13 with a third center axis 14 at a distance b from the first center axis 2. The diameter of the through hole 13 is different from the diameter of the through hole 7 of the punch holder with the first embodiment. The disk-shaped body has a cylindrical countersink 15 around its third center axis 14 from its upper side. The counterbore 15 has a sector with an inner peripheral surface 16 circular relative to the third center axis 14, and a sector in which the inner surface 17 is parallel to a tangent to the throughbore 13. The distance between the tangential inner surface 17 and the third center axis 14 is greater than the radius of the through-hole 13 and smaller than the radius of the circular sector of the countersink 15.

In alternative embodiments, the disc-shaped body is provided with either no or more second punch holders 12, which, if present, all have the same distance b between the first center axis 2 and the third center axis 14.

Furthermore, the execution of the first and / or second punch recordings in other embodiments with a reduction with another contour, which is not rotationally symmetrical, possible. The contour is not necessarily cylindrical, but may also be conical. Alternatively, the execution of the stamp recordings is possible without lowering. In further embodiments, at least one or more recesses may be provided on the circumference of the bore or the countersink, which are not rotationally symmetrical to its central axis.

Analogous to the stamp receptacles a through hole 37 is provided with a cylindrical counterbore for fixing tool inserts from a second tool system in the disk-shaped body.

In Fig. 2 is a perspective view of a section through a punch shaft 18 is shown. The punch shaft 18 has a central axis, which in an in Fig. 3 shown assembled state identical to the central axis 2 of the punch adapter 1. In its upper region, the stamp shaft 18 has a pin 19 in a form suitable for accommodating the stamp shaft in an upper tool holder of a punching machine. Subsequently, the stamp shank 18 has a disk-shaped region 20. The disc-shaped portion 20 has an outer contour with which a later-described upper tool part can be received in a tool cartridge. Starting from its underside, the disk-shaped region 20 has a round cylindrical countersink 21 with a certain depth. On the outer circumference of the countersink 21 a plurality of, here three, radially extending cylindrical recesses 22 are provided. Furthermore, in the direction of the axis 2 above the counterbore 21, a further cylindrical countersink 23, and a through bore 24 is provided with an overhead cylindrical counterbore 25.

The arrangement of the countersink 21 with the recesses 22, the countersink 23 and the through hole 24 with the cylindrical countersink 25, the central recording and attachment of standard tool inserts with a certain size and expression of the connection device of the tools is possible. The recesses 22 serve for a defined orientation of standard tool inserts to the stamp shank 18.

Fig. 3 is a sectional view of a tool upper part 38 with the punch shaft 18, the punch adapter 1 and a tool insert 26, shown in the installed position.

The tool insert 26 has at the lower end on a cylindrical portion 27 with a square contour here. The contour of the section 27 is dependent on the contour of a cutout in a plate-shaped body to be produced with this tool insert. This is followed by another cylindrical section 28 with a circular shape. The diameter of the cylindrical portion 28 is matched with the through hole 13 that an axial sliding bearing is present. At the upper end of the tool insert 26, this has a further cylindrical portion 29 with a contour which is complementary to the contour of the countersink 15. Due to the tangential surfaces 17 ( Fig. 1 ) in the contour of the countersink 15 and the complementary contour of the portion 29, a rotation of the tool insert 26 is prevented.

The turning of the tool insert can, in the case of a countersink, have a different, not rotationally symmetrical, contour than the countersink 15 in Fig. 1 through a portion of the tool insert be prevented, which is designed to complement the contour of this reduction. The section must at least be designed such that a sector of the section comes into engagement with the contour of the countersink so that it is not possible to turn the tool insert.

In embodiments in which no countersinking is provided in the disc-shaped body, twisting of the tool bit is prevented by other additional suitable means.

Furthermore, a tool insert can alternatively be attached by screwing by means of a second screw, which is provided through the bore 37, which is provided with a countersink.

The stamp adapter 1 protrudes with its receiving device 3 into the countersink 23 of the stamp shaft 18, wherein the receiving device 3 is tuned with the countersink 23 so that the countersink 23 represents a centering in the radial direction for the cylindrical elevation of the receiving device. For fixing the stamp adapter 1 in the stamp shaft 18, a screw 30 is provided. The screw 30 is supported in the countersink 25, protrudes through the through hole 24, and is screwed to the thread 4 of the punch adapter. As a result, the upper side of the disk-shaped region of the stamp adapter 1 bears against the underside of the disk-shaped region 20 of the stamp shaft 18.

The stamp adapter 1 is oriented toward the stamp shaft 18 in such a way that the substantially rectangular rod-shaped elevation 5 (FIG. Fig. 1 ) in one of the three recesses 22 (FIG. Fig. 2 ), whereby the orientation of the punch adapter 1 is fixed to the punch shaft 18, and the increase 5 and one of the three recesses 22 serve to prevent rotation. The anti-twist device between the punch shaft 18 and the punch adapter 1 can also be performed with a different geometry.

The top of the tool bit 26 is located with its top on the underside of the punch shaft 18, and is thus immovably provided between the bottom of the punch shaft 18 and the counterbore 15 in its axial direction relative thereto.

Thus, tool inserts 26, which can be produced without much effort, in two different sizes by means of the punch adapter 1 off-center be incorporated into a known stamp shank 18.

Fig. 4 FIG. 5 illustrates a die adapter 31. The die adapter 31 is disposed in a tool base, shown later, which is received in a rotatable lower tool holder of a punching machine. The die adapter 31 has a fourth central axis 32. In the die adapter 31 are female mounts 33 having a first shape with a fifth central axis 35 each at a distance c from the central axis 32, and female mounts 34 with a second shape with a sixth central axis 36, wherein the second expression is designed differently than the first expression , in each case at a distance d from the central axis 32, is provided.

The number of Matrizenaufnahmen 33, 34 is variable depending on the respective embodiment, wherein at least two Matrizenaufnahmen 33, 34 are provided in a die adapter 31.

Fig. 5 shows a schematic representation of a tool set 39 for low-arm punching. The tool set 39 has the tool upper part 38. In the tool upper part 38 is a tool insert 26, here a round pin with a certain diameter provided.

The die adapter 31 is arranged in a tool lower part 40. In the die adapter 31, five different dies 41 are provided here at the distance c from the central axis 2. The diameter of the dies 41 is larger than the diameter of the tool bit 26 in the upper die 38, respectively, to form a cutting gap between the bit 26 and the dies 41. The required kerf is 10% of the sheet thickness, so that the diameters of the dies 41 are mutually different, e.g. differ by a few tenths of a millimeter in order to form the required kerf for the sheet to be machined with the respective thickness. The selection of which cutting gap is used is made by relative rotation of the tool top 38 to the tool bottom 40 with the die adapter.

In operation, the tool upper part 38, if necessary, prepared in preparation for use in the punching machine, ie the connection of the punch shaft 18 and the punch adapter 1 is simple, here only by loosening and unscrewing the screw 30, separated, and the upper tool part is disassembled by pulling it into its two housing parts, the stamp shaft 18 and the stamp adapter 1. The tool insert 26 to be replaced is then replaced from the punch holder 10, 12 by the existing tool insert 26 pushed out and another, required tool insert is inserted into the appropriate punch holder 10, 12. The adapter 1 is then inserted back into the stamp shaft 18 and fastened with the screw 30. Subsequently, the appropriate matrices are introduced into the die holders 33, 34 of the die adapter 31. The upper tool part 19 and the lower tool part 40 are then placed in a toolbox and ready for use in the punching machine.

• Stempeladapter 1 für ein Werkzeugsystem für eine Stanzmaschine mit einer ersten Mittelachse 2, einer Aufnahmeeinrichtung 3 zum Aufnehmen des Stempeladapters 1 in einen Stempelschaft 18, mindestens einer Stempelaufnahme 6 mit einer ersten Ausprägung, die eine zweite Mittelachse 8 aufweist, und die zweite Mittelache 8 parallel zu der ersten Mittelachse 2 verläuft und nicht identisch mit der ersten Mittelachse 2 ist, wobei die Stempelaufnahme 6 eine erste Durchgangsbohrung 7 mit der zweiten Mittelachse 8 und eine nicht rotationssymmetrische Senkung, oder eine Senkung aufweist, die mit zumindest einer oder mehreren Aussparungen, die zu der zweiten Mittelachse 8 nicht rotationssymmetrisch sind, vorgesehen ist, oder
• Stempeladapter 1, optional mit mindestens einer zweiten Stempelaufnahme 12 mit einer zweiten Ausprägung, die eine dritte Mittelachse 14 aufweist, die parallel zu der ersten Mittelachse 2 verläuft und nicht identisch mit der ersten Mittelachse 2 ist und die zweite Stempelaufnahme 12 eine zweite Durchgangsbohrung 13 mit der dritten Mittelachse 14, und eine nicht rotationssymmetrische Senkung, oder eine Senkung mit zumindest einer oder mehreren Aussparungen aufweist, die zu der dritten Mittelachse 14 nicht rotationssymmetrisch sind,
  wobei
• zumindest eine der Stempelaufnahmen 6, 12 eine Senkung 9, 15 aufweist, die einen Sektor mit einer bezüglich der zugehörigen Mittelachse 8, 14 kreisrunden inneren Umfangsfläche 10, 16, und einen Sektor, in dem die innere Fläche 11, 17 parallel zu einer Tangente an die Durchgangsbohrung 7, 13 ist, aufweist, wobei der Abstand zwischen der tangentialen inneren Fläche 11, 17 und der zugehörigen Mittelachse 8, 14 größer als der Radius der zugehörigen Durchgangsbohrung 7, 13 und kleiner als der Radius des kreisrunden Sektors der Senkung 9, 15 ist, und wobei optional zumindest eine der Senkungen 9, 15 zylindrisch ist.

Other possible embodiments are:

• Stamp adapter 1 for a tooling system for a punching machine having a first center axis 2, a receiving device 3 for receiving the punch adapter 1 in a punch shaft 18, at least one punch holder 6 having a first form having a second center axis 8, and the second center axis 8 parallel to the first central axis 2 and is not identical to the first central axis 2, wherein the punch holder 6 has a first through hole 7 with the second central axis 8 and a non-rotationally symmetrical countersink, or a countersink having at least one or more recesses to the second central axis 8 are not rotationally symmetric, is provided, or
• Stamp adapter 1, optionally with at least a second punch holder 12 having a second expression, which has a third central axis 14 which is parallel to the first central axis 2 and not identical to the first central axis 2 and the second punch holder 12 has a second through hole 13 with the third central axis 14, and a non-rotationally symmetrical countersink, or a countersink having at least one or more recesses, which are not rotationally symmetrical to the third central axis 14,
  in which
• at least one of the punch receivers 6, 12 has a countersink 9, 15, which has a sector with an inner peripheral surface 10, 16 which is circular relative to the associated center axis 8, 14, and a sector in which the inner surface 11, 17 is parallel to a tangent the through hole 7, 13 is, wherein the distance between the tangential inner surface 11, 17 and the associated central axis 8, 14 is greater than the radius of the associated through-hole 7, 13 and smaller than the radius of the circular sector of the counterbore 9, 15, and optionally being at least one of the counterbores 9, 15 is cylindrical.

Tool upper part 38 for a tool system for a punching machine, comprising a stamp shank 18,
a stamp adapter 1, and at least one interchangeable tool insert (26).

Claims (16)

Punch adapter (1) for a tooling system for a punching machine having a first central axis (2),
a receiving device (3) for receiving the stamp adapter (1) in a stamping shaft (18),
at least one stamp receiver (6) having a first configuration, which has a second central axis (8),
and the second central axis (8) is parallel to the first central axis (2) and is not identical to the first central axis (2), characterized in that
the punch holder (6) has a first through hole (7) with the second central axis (8) and a non-rotationally symmetrical countersink, or countersink, provided with at least one or more recesses which are not rotationally symmetrical to the second central axis (8) is. Stamp adapter (1) according to claim 1, characterized in that the stamp adapter (1) has at least one second punch holder (12) with a second expression, which has a third center axis (14) which runs parallel to the first center axis (2) and is not identical to the first central axis (2) and the second punch receiving means (12) has a second throughbore (13) with the third central axis (14), and a non-rotationally symmetrical counterbore, or a counterbore with at least one or more recesses the third central axis (14) are not rotationally symmetrical. Punch adapter (1) for a tooling system for a punching machine having a first central axis (2),
a receiving device (3) for receiving the stamp adapter (1) in a stamping shaft (18),
at least one punch holder (6) having a first configuration, which has a first through-hole (7) with a second central axis (8),
and the second central axis (8) is parallel to the first central axis (2) and is not identical to the first central axis (2), characterized in that
the adapter (1) has at least one punch holder (12) with a second configuration, which has a third central axis (14) which runs parallel to the first central axis (2) and is not identical to the first central axis (2). Stamp adapter (1) according to claim 3, characterized in that the punch holder (12) with a second expression, a second through hole (13) with a different diameter than the first through hole (7) to the third central axis (14), not identical to the second central axis (8). Stamp adapter (1) according to one of claims 1 to 4, characterized in that the adapter has at least one second punch holder (6) with the first expression with the second central axis (8), and a distance (a) between the first central axis (2 ) and the two second central axes (8) is identical. Stamp adapter (1) according to one of claims 1 to 5, characterized in that the adapter (1) has at least one second punch holder (12) with the second configuration with the second through-hole (13) with the third center axis (14). and a distance (b) between the first central axis (2) and the two third central axes (14) is identical. Stamp adapter (1) according to one of the preceding claims, characterized in that the adapter (1) has a central thread (4) with the first central axis (2) for connection to the punch shaft (18) by means of a first screw (30). Stamp adapter (1) according to one of the preceding claims, characterized in that the adapter (1) has at least one through hole (37) for receiving a second screw for screwing a tool insert. Tool upper part (38) for a tool system for a punching machine, comprising
a stamp shaft (18),
a stamp adapter (1) according to one of claims 1 to 8, and at least one replaceable tool insert (26). Tool upper part (38) according to claim 9, characterized in that the upper tool part (38) has a connecting means (30), and by simply releasing the connection between the punch shaft (18) and the punch adapter (1) are separable. Tool upper part according to one of claims 9 or 10, characterized in that the punch shaft (18) and the punch adapter (1) have an anti-rotation device (5, 22). Tool upper part according to claim 11, wherein the rotation of a backup (5) and a recess (22). Tool upper part according to one of claims 9 to 12 with a punch adapter (1) according to claim 8, wherein the tool insert (26) is secured by the second screw through the bore (37). Tool system for a punching machine, comprising a tool upper part (19) according to one of claims 9 to 13, and
a tool lower part (40) which has a die adapter (31) with at least two die receptacles (33), wherein in the die receptacles (33) in each case one to the tool insert (26) associated die insert (41) is provided. Tool system for a punching machine according to claim 14, characterized in that the die adapter (31) has a fourth central axis (32) and the die receptacles (33) each have a fifth central axis (35), and the distance (a) between the first central axis ( 2) and the second central axis (8), and a distance (c) between the fourth central axis (32) and the fifth central axis (35) are identical. Tool system according to claim 15, characterized in that the die adapter (31) has female mounts (34) with a second configuration and each with a sixth central axis (36), and the distance (b) between the first central axis (2) and the third central axis (14), and a distance (d) between the fourth center axis (32) and the sixth center axis (36) is identical.

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