EP2414114B1 - Punching tool - Google Patents

Description

The invention relates to a punching tool with a punch and a guide housing in which the punch is guided, according to the preamble of Anpruchs first

Such a punching tool is from the DE 296 09 541 U1 , from the US 5,127,293 and known by public prior use. Such a punching tool can be used in a punching machine, in particular in a turret punching machine, with a robot tool changing system. A plurality of such punching tools can then be placed in a storage rack, which is connected via a robotic tool change gripper with a punching machine, which uses each one of the punching tools. The tool is pulled out of the storage rack or from a turret of the punching machine via the robot tool change gripper, which attaches to the head part of the punching tool. It must be absolutely avoided that the guide housing dissolves undesirable from the punch when grasping the punching tool on the head part.

It is therefore an object of the present invention, a punching tool of the type mentioned in such a way that such unwanted loosening is reliably prevented.

This object is achieved by a punching tool with the features specified in claim 1. Advantageous embodiments of the punching tool according to the invention are defined in the subclaims.

According to the invention, it has first been recognized that a fixing device, which effects a fixation of the punching stamp on the guide housing that can be overcome in the gripping force direction, ensures safe operation of a punching machine with a robot tool change system is not sufficient. The securing device according to the invention ensures a simple assembly of the punching tool, wherein it is not necessary to tighten the fixing screws to secure the guide housing. In particular, the securing device according to the invention makes it possible to realize a length adjustment by turning the guide housing relative to the head part of the punch without loosening a fixing screw. In the operating state, the guide bodies are present in the securing circumferential relative position, so that a gripping of the head part of the punch with the robot tool change gripper is possible in a secure manner, without losing the guide housing. The locking interaction of the guide body in the securing circumferential relative position takes place in particular by positive locking. The head part can be designed as a component separate from the stamped part, which is detachably connected to the stamped part. Alternatively, an embodiment of the punch is possible in which the stamped part is integrally connected to the head part. The design in the securing device, wherein the base guide body is formed as at least one circumferential rib, which extends over a portion of a circumference about the longitudinal axis of the punch, wherein the counter-guide body is formed as at least one guide groove, the at least one circumferential rib is designed complementary and extends at least over a portion of the circumference about the longitudinal axis of the punch, is inexpensive to manufacture. Of course, conversely, it is also possible to form the base guide body as a guide groove and the counter-guide body as a circumferential rib.

The arrangement of a circumferential rib, which is embodied in an annular cover which surrounds the punch and which rests on a peripheral collar of the guide housing, has proven itself in practice. The ring lid can simultaneously serve as an abutment for a stamped compression spring, which returns the punch after punching back to the starting position. A change of the guide body between the securing circumferential relative position and the release circumferential relative position on the one hand safely prevents unwanted loosening of the guide housing and allows on the other hand, for example, for disassembly and in particular for maintenance, a simple release of the guide housing. An additional actuation of a release device prior to release of the guide housing, as soon as the guide body is in the release-circumferential relative position, no longer required. According to the invention does not represent the punch the counter body in the backup of the guide housing, but the surrounding the punch stamped ring cover. The punch itself can then be performed standardized, without that there must be incorporated a guide body for the security device. The inventive design with the circumferential rib in the ring cover as one of the guide body avoids the need for an additional security component in the construction of the securing device, as in the form of an additional locking ring in the punching tool after DE 296 09 541 U1 the case is.

A design according to claim 2 allows easy assembly and disassembly of the punching tool. When the recesses circumferentially overlap the circumferential ribs, the release circumferential relative position is present.

An arrangement of the guide groove according to claim 3 has proven itself in practice.

A locking device according to claim 4 ensures that the punching tool is operated exclusively in the at least one securing circumferential relative position.

An additional fixing device according to claim 5 prevents unwanted release of the guide housing from the punch even in the release circumferential relative position. This is during a length adjustment of the punch, which can be done with a corresponding screw thread configuration by rotating the stamped part relative to the head part, an advantage.

A peripheral marking according to claim 6 facilitates in particular the finding of the release circumferential relative position for mounting and for dismantling the punching tool.

Fig. 1

eine Explosionsdarstellung eines Stanzwerkzeugs mit einem Stanzstempel und einem Führungsgehäuse;

Fig. 2

einen Teil-Zusammenbau einer kopfseitigen Komponentengruppe des Stanzwerkzeugs nach Fig. 1, wobei schematisch ein dieses ergreifendes Greifwerkzeug im Querschnitt angedeutet ist;

Fig. 3

einen Teil-Zusammenbau des Führungsgehäuses des Stanzwerkzeugs nach Fig. 1;

Fig. 4

verglichen mit Fig. 2 vergrößert eine Ansicht aus Blickrichtung IV in Fig. 2;

Fig. 5

verglichen mit Fig. 3 vergrößert eine Ansicht aus Blickrichtung V in Fig. 3;

Fig. 6

perspektivisch einen bei montiertem Stanzwerkzeug den Stanzstempel umgebenden Ringdeckel mit einem Basis-Führungskörper einer Sicherungseinrichtung, ausgebildet als zwei Umfangsrippen, die sich jeweils über einen Umfangsabschnitt um den Ringdeckel erstrecken; und

Fig. 7

ebenfalls perspektivisch einen ringdeckelseitigen Abschnitt des Führungsgehäuses mit einem Gegen-Führungskörper der Sicherungseinrichtung, der in Form von zwei Führungsnuten gestaltet ist, die zum Basis-Führungskörper komplementär ausgestaltet sind und sich jeweils über einen Umfangsabschnitt des Führungsgehäuses erstrecken.

An embodiment of the invention will be explained in more detail with reference to the drawing. In this show:

Fig. 1

an exploded view of a punching tool with a punch and a guide housing;

Fig. 2

a partial assembly of a head-side component group of the punch after Fig. 1 , wherein schematically this engaging gripping tool is indicated in cross section;

Fig. 3

a partial assembly of the guide housing of the punch after Fig. 1 ;

Fig. 4

compared to Fig. 2 enlarges a view from the direction of view IV in Fig. 2 ;

Fig. 5

compared to Fig. 3 enlarges a view from the direction V in Fig. 3 ;

Fig. 6

in perspective, a ring cover surrounding the punch with a punching tool mounted with a base guide body of a securing device, designed as two circumferential ribs, each extending over a peripheral portion around the ring cover; and

Fig. 7

also in perspective a ring cover-side portion of the guide housing with a counter-guide body of the securing device, which is designed in the form of two guide grooves, which are designed to be complementary to the base guide body and each extending over a peripheral portion of the guide housing.

A punching tool 1 has a punch 2 for forming at least one punched hole in a workpiece. The punch 2 has a stamped part 3 with the actual, coming into contact with the workpiece punching section 4 and a head part 5, which is connected to the stamped part 3 via a screw not shown.

The punching section 4 has, perpendicular to a longitudinal axis 7 of the punching tool 1, a cross section which corresponds to the cross section of the punching hole to be produced. In the illustrated embodiment, this cross-section is rectangular. Depending on the desired outer shape of the punch hole of the Stamping section 4 course also another, for example, a round, a square, an oval cross section or a special shape, for example, star-shaped, have a cross-section. An inner jacket wall of the stamped part 3 has an internal thread, not visible in the drawing, of the screw connection for connecting the stamped part 3 to the head part 5.

The head part 5 comprises a stamping part 3 facing punch driver 9 and a stamp head element 10 with a head surface 11, which is acted upon by the punching machine, in which the punching tool 1 is housed forth. The stamp head element 10 and the stamp driver 9 are connected to one another via a cylinder screw 12 (cf. FIG. 1 ) and therefore fixed to each other. An outer jacket wall of the stamp driver 9 has an external thread of the screw connection, via which the stamped part 3 is connected to the head part 5.

A length of the punch 2 between the top surface 11 and the punching section 4 is adjustable over a screw depth of the screw connection between the stamped part 3 and the head part 5.

The punch 2 is guided along a punching-displacement movement, which runs parallel to the longitudinal axis 7, in a guide housing 13 of the punching tool 1. On a head-side peripheral collar 14 of the guide housing 13 is an annular cover 15. Between this and a peripheral collar 16 of the stamp head element 10, a stamped compression spring 17 is supported, which is designed as a helical spring or as a plate spring package. The punching compression spring 17 biases the punching tool 1 in a rest position. In this, the punching section 4 is behind an end face End stripper surface 18 of a wiper body 19 retracted by a few tenths of a millimeter.

The ring cover 15 is non-rotatably connected to the punch driver 9 in a rotationally fixed manner when the punch 2 is mounted.

The scraper body 19 is fixed to the guide housing 13 and secured thereto. The scraper body 19 has a scraper opening 20 complementary to the cross-section of the punching section 4, through which the punching section 4 is guided during punching.

When punching tool 1 has a release slide 21 has the function of a locking body for the length adjustment of the punching tool 1 by rotating the stamped part 3 relative to the head part 5 to the screw connection between them. In a locking position of the Entriegelungsschiebers 21 an unlocking biasing spring 22 opposite portion of the Entriegelungsschiebers 21 engages in one of a plurality of Arretieraufnahmen 23, which are formed in the punching tool 1 as axial through holes in the ring cover 15 of the punching tool 1. The locking receptacles 23 are arranged distributed equally in the circumferential direction around the longitudinal axis 7 in the punching tool 1.

A cylinder head screw 24, which is screwed radially from the outside into the cover-side peripheral collar 14 of the guide housing 13, secures the unlocking slide 21 in the locking position into which the unlocking slide 21 is in turn biased by means of the unlocking biasing spring 22 designed as a compression spring. The cylinder screw 24 engages in an axially, ie parallel to the longitudinal axis 7, extending groove in the unlocking slide 21 of the punching tool 1 a.

A securing device 25 secures the punch 2 against undesired release from the guide housing 13 when gripping the punching tool 1 on the head part 5 or on the stamp head element 10. This gripping is in the FIG. 2 indicated by a schematically indicated robot tool change gripper 26.

The securing device 25 has a base guide body in the form of two peripheral ribs 27, 28. The peripheral ribs 27, 28 are integrally formed on a sleeve extension 29 of the annular cover 15 (see also FIGS. 4 and 6 ). Due to the Anformung on the ring cover 15, the circumferential ribs 27, 28 with respect to a force acting on the punch 2 gripping force direction 30 (see. FIG. 3 ) Stempelfest arranged counter to a punching direction, since with mounted punching tool 1, the ring cover 15 is a fixed to the punch 2 attached component.

The circumferential ribs 27, 28 extend over a respective portion of a circumference about the longitudinal axis 7 of the punching tool 1. Between these peripheral portions, the sleeve extension 29 is configured rib-free over a larger circumferential area. In the illustrated embodiment, exactly two circumferential ribs 27, 28 are present.

The securing device 25 further has a counter-guide body in the form of two guide grooves 31, 32. The counter-guide body is an integral part of the guide housing 13 and is therefore arranged fixed to the housing with respect to the gripping force direction 30. By rotation of the guide housing 13 relative to the ring cover 15 about the longitudinal axis 7, the circumferential ribs 27, 28 of the base guide body in the circumferential direction about the longitudinal axis 7 of the punching tool 1 relative to the guide grooves 31, 32 of the counter-guide body of the securing device 25 are displaced.

The two guide grooves 31, 32 are complementary to the circumferential ribs 27, 28 in terms of the groove width, the shape of the groove bottom, the rib width, the radial rib extension and the rib cross-section. The guide grooves 31, 32 extend over a respective portion of the circumference of the guide housing 13 about the longitudinal axis 7 of the punching tool 1. The guide grooves 31, 32 are formed as circumferential grooves in an inner housing shell wall 33 in the region of the peripheral collar 14 of the guide housing 13.

Between the two guide grooves 31, 32 are in the circumferential direction about the longitudinal axis 7 two recesses 34, 35 in the inner housing shell wall 33, so that an inner diameter of the housing shell wall 33 in the region of the recesses is greater than the radius of the peripheral ribs 27, 28. In addition the two recesses 34, 35 have a circumferential extent about the longitudinal axis 7, which is slightly larger than the circumferential extent of the circumferential ribs 27, 28th

Due to this complementary design of the circumferential ribs 27, 28 to the guide grooves 31, 32 on the one hand and the recesses 34, 35 on the other hand, the sleeve extension 29, when the circumferential position of the circumferential ribs 27, 28 corresponds to the circumferential position of the recesses 34, 35 from the circumferential collar 14 ago in the Guide housing 13 are inserted until the circumferential ribs 27, 28 are axially at the level of the guide grooves 31, 32. This circumferential position, in which an insertion of the sleeve extension 29 of the ring cover 15 in the guide housing 13 is possible, is also known as Release circumferential relative position of the securing device 25 is designated.

If the circumferential ribs 27, 28 are axially at the level of the guide grooves 31, 32, starting from the release circumferential relative position, twisting of the annular cover 15 relative to the guide housing 13 about the longitudinal axis 7 is possible, so that a securing circumferential relative position is achieved in which the circumferential ribs 27, 28 engage in the guide grooves 31, 32 and thus a secure, positive-locking interaction of these two guide body of the securing device 25 is achieved. In this position, the positive locking of the circumferential ribs 27, 28 in the guide grooves 31, 32 prevents the guide housing 13 from undesirably coming loose from the annular cover 15 when a force is applied in the gripping force direction 30.

The unlocking slider 21 has a locking extension 36, which is executed by an axially extending passage opening 37 in the circumferential collar 14 of the guide housing 13.

Axially between the annular body of the annular cover 15, in which the locking receptacles 23 are executed, and the circumferential ribs 27, 28, a circumferential groove 38 is formed in the sleeve extension 29 of the annular cover 15, into which an O-ring 39 (see. FIG. 1 ) is inserted.

When introduced into the guide housing 13 sleeve extension 29 of the O-ring 39 comes in a further circumferential groove 39a in the inner housing shell wall 33 and ensures a supportive, surmountable fixation of the punch 2 against unwanted release of the guide housing 13 when gripping the punch 1 on Headboard 5 also in the release circumferential relative position of the ring cover 15 to the guide housing 13th

The O-ring 39, together with the circumferential grooves 38, 39a provided for it on the one hand in the ring cover 15 and on the other hand in the housing shell wall 33 an additional fixing device for the punch 2 on the guide housing 13.

To display the respective circumferential relative position of the annular cover 15 to the guide housing 13 may be provided on the guide housing 13 and / or on the punch 2 and the ring cover 15, a circumferential marker not shown in the drawing.

During assembly of the punch 2, the punch driver 9 is inserted into the ring cover 15, into the punch compression spring 17 and into the stamp head element 10. About the cylinder screw 12 takes place in an axial position in which a peripheral cone 40 which is integrally formed on the punch driver 9, fixed to a complementary executed peripheral cone 41 of the ring cover 15, a fixation of the punch driver 9 on the stamp head element 10. Due to this fixation is the ring cover 15 firmly integrated with the other components of the punch 2.

The thus completed unit can then with the according to FIG. 3 preassembled guide housing 13 are connected. For this purpose, the ring cover 15 and the guide housing 13 are oriented in the circumferential direction about the longitudinal axis 7 in the release circumferential relative position and the circumferential ribs 27, 28 are inserted into the recesses 34, 35 until they lie axially at the level of the guide grooves 31, 32 come. In this orientation of the circumferential relative position, the peripheral marking helps on the guide housing, which is aligned in the release circumferential relative position with a corresponding thereto peripheral marking of the ring cover 15. Subsequently, the guide housing 13 can be rotated about the longitudinal axis 7 relative to the ring cover 15 until the securing circumferential relative position is reached. In the illustrated embodiment, there are a total of eight securing circumferential relative positions corresponding to the circumferential positions in which the Arretierfortsatz 36 of the Entriegelungsschiebers 21 with one of the eight Arretieraufnahmen 23 in the ring cover 15 is aligned. In these securing circumferential relative positions of the unlocking slide 21 serves as a locking device for releasably locking the guide body 27, 28 and 31, 32 in the securing circumferential relative position.

To set the length of the punch 2, the stamped part 3 can be rotated relative to the head part 5 about the longitudinal axis. This happens, in which the guide housing 13 is rotated relative to the ring cover 15 about the longitudinal axis 7. For this purpose, the lock is released by actuation of the Entriegelungsschiebers 21 and retracting the Arretierfortsatzes 36 from the associated Arretieraufnahme 23. When turning to adjust the length of the punch 2, the release circumferential relative position of the guide housing 13 is achieved relative to the ring cover 15 in the meantime. The fixing device having the O-ring 39 ensures in this release circumferential relative position that the guide housing 13 does not undesirably come off the punch 2.

After the length adjustment of the unlocking slide 21 is released and the guide housing 13 further rotated relative to the ring cover 15 about the longitudinal axis 7 until the Arretierfortsatz 36 of the Entriegelungsschiebers 21 under bias of the unlocking biasing spring 22nd engages in the closest in the circumferential direction locking receptacle 23. In this locking position is due to the choice of the circumferential positions of the circumferential ribs 27, 28 relative to the selection of the circumferential positions of the recesses 34, 35 forcibly always before the backup circumferential relative position. If, after length adjustment, the punching tool 1 is then released for automated alternating operation, it is ensured via the securing device 25 that after grasping the stamping head element 10 via the robot tool change gripper 26, it is reliably avoided that the guide housing 13 will be released from the punch 2 in an undesired manner.

An anti-rotation of the stamped part 3 relative to the guide housing 13 is formed in the punching tool 1 by a guide pin 42 which is inserted into the stamped part 3 and engages in an axially extending longitudinal groove in the guide housing 13.

In the case of the punching tool 1, a tool lower part 43, which is arranged below the guide housing, is additionally shown. When the punching tool 1 is in operation, the workpiece is inserted between the closing stripper surface 18 and the tool lower part 43.

A spring-loaded ball pressure piece 44, which is embedded in an end wall of the guide housing 13 facing the ring cover 15 (see the exploded view according to FIG FIG. 1 ) provides a clicking / locking sound in the length adjustment of the punching tool 1. Another spring-loaded ball pressure piece 45 is recessed on the opposite end face of the guide housing 13 for transport safety purposes.

Claims (6)

1. Punching tool (1) comprising

   - a punching die (2) for forming at least one punched hole in a workpiece,

   - a guide housing (13) in which the punching die (2) is guided along a punching displacement movement thereof,

   - with the punching die (2) comprising:

   -- a punching member (3) with a punching portion (4),

   -- a head (5),

   characterized by a safety device (25) which secures the punching die (2) against an unwanted release from the guide housing (13) when the punching tool (1) is gripped at the head (5) and which comprises:

   - a base guide body (27, 28) which is securely mounted relative to the punching die (2) at least with respect to a gripping force direction (30) acting on the punching die (2) in a direction opposite to a punching direction,

   - a counter guide body (31, 32) which is securely mounted relative to the housing at least with respect to the gripping force direction (30) and is displaceable relative to the base guide body (27, 28) in the circumferential direction about a longitudinal axis (7) of the punching tool (1),

   - with the guide bodies (27, 28; 31, 32) being designed in such a way that

   -- in at least one retaining relative circumferential position, they interact in a securing manner,

   -- in a release relative circumferential position, which is displaced relative to said retaining relative circumferential position in the circumferential direction about the longitudinal axis (7), they allow the punching die (2) to be released from the guide housing (13) in the gripping force direction (30), with the base guide body (27, 28) being designed as at least one circumferential rib which extends about the longitudinal axis (7) of the punching tool (1) over a portion of a circumference, with the counter guide body (31, 32) being designed as at least one guide groove which is complementary to the at least one circumferential rib and extends about the longitudinal axis (7) of the punching tool (1) at least over a portion of the circumference,
   with the circumferential rib (27, 28) being provided in an annular lid (15) which encloses the punching die (2) and which rests on a circumferential collar (14) of the guide housing (13).
2. Punching tool according to claim 1, characterized by exactly two circumferential ribs (27, 28) and exactly two guide grooves (31, 32), there being provided two recesses (34, 35) between the two guide grooves (31, 32) when seen in the circumferential direction, with each of the two recesses (34, 35) having a circumferential extension which is at least equal to the circumferential extension of one of the circumferential ribs (27, 28).
3. Punching tool according to claim 1 or 2, characterized in that the guide groove (31, 32) is a circumferential groove in an inner circumferential housing wall (33) of the guide housing (13).
4. Punching tool according to one of claims 1 to 3, characterized by a locking device (21) for releasably locking the guide bodies (27, 28; 31, 32) in the retaining relative circumferential position.
5. Punching tool according to one of claims 1 to 4, characterized by an additional fixing device (39) for additionally and releasably securing the punching die (2) against an unwanted release from the guide housing (13) when the punching tool (1) is gripped at the head (5) in the release relative circumferential position of the guide bodies (27, 28; 31, 32).
6. Punching tool according to one of claims 1 to 5, characterized by a circumferential marking at the guide housing (13) and/or at the punching die (2) which indicates the circumferential relative position.

Images