DE102015006678A1 - Punching unit for a forming tool for punching openings in flat workpieces - Google Patents

Abstract

The invention relates to a punching unit for a forming tool for punching apertures into flat workpieces, comprising a punch unit (1) for a first tool part and an associated punch bushing unit (2) for an opposite second tool part. According to the invention, a punch receiving bearing part (3) of the punch unit (1) is designed as an annularly closed punch receiving housing (3) and / or a hole bushing bearing part of the perforated bushing unit (2) is designed as a ring-shaped closed bushing housing (20). is trained.

Description

The invention relates to a punching unit for a forming tool for punching openings in planar. Workpieces according to the preamble of claim 1.

Such a punch unit generally consists of a punch unit for a first tool part and an associated punch bushing unit for an opposite second tool part. In a forming tool such as a press, the stamp unit is usually mounted on the press top and the bushing unit is mounted on the press bottom opposite. For the forming in connection with the punching of apertures, a sheet-like workpiece, for example, a sheet metal blank is inserted into the opening area of the press and optionally fixed with a hold-down on the lower tool part. Subsequently, the press is closed, wherein the punch of the punch unit is pressed through the sheet metal blank and through the bushing of the underlying hole bushing unit to produce a corresponding breakthrough.

In particular, various holes are present on body components, which are produced in press tools by punching. Depending on the function of the holes, different demands are placed on the accuracy of the shape and position tolerances. For this purpose, for example, punch units and bushing units are known, which are fixed, without subsequent correction option in the pressing tool. For the production of precise punched holes in connection with a correction possibility of the punched holes already adjustable punching units are known:
In a known adjustable punching unit ( DE 10 2007 037 757 A1 ), the punch or the associated hole bushing is arranged on an inner ring part, which is mounted eccentrically in further rings, which are rotatable against each other for a positional adjustment. A positive, backlash-free connection of the ring parts is not given here, so that despite the adjustability larger tolerances of the punched holes are possible.

In another known, generic adjustable hole unit ( DE 10 2005 022 757 B3 ), from which the invention proceeds, is also a punch unit and an associated bushing unit used. The stamp unit here has a punch receiving part with a punch and a stamp receiving bearing part. The punch receiving bearing part is fixedly connected to the first tool part and the punch receiving part is supported in a recess of the punch receiving bearing part by means of tuning plates adjustable in position and held fixable.

Also, the bushing unit is constructed according to the stamp unit, with a hole bushing part and a bushing bearing part. Again, the bushing bearing part is stationary connected to the second tool part and the hole bushing part is supported in a recess of the bushing bearing part position adjustable by means of support plates and held fixable.

The recess in the punch receiving bearing part and correspondingly in the bushing bearing part has laterally open contours in the holding area for the punch receiving part or for the hole bushing part, which disadvantageously reduces the stability of the bearing parts, in particular when used for highly stressed punching operations. In addition, the fittings on the punch receiving bearing part and correspondingly on the bushing bearing part are mounted on one side opposite to the open contours of the recess, so that no uniform contact pressure is given with the screw on each associated tool part. As a result, in particular, the bottom plate of the punch receiving bearing part and corresponding to the hole bush bearing part can be deformed and curved, so that the punch can unpredictably tilt something, whereby an inaccurate hole position must be taken into account.

In addition, the holding force between the punch receiving bearing part and the punch receiving part and the hole bushing bearing part and the hole bushing part by means of a clamping screw is achieved by frictional engagement, whereby the holding force is relatively lower in contrast to a positive connection. In addition, there is also no defined contact force of the punch receiving part or of the perforated bush part for the respective bottom plate.

The object of the invention is to develop a generic adjustable punching unit so that positional tolerances of the punched holes are further reduced and the stability can be increased with reducible dimensions.

The object is achieved with the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

According to claim 1, a punching unit for a forming tool for punching apertures into flat workpieces is proposed which has a punch unit for a first tool part and an associated punch bushing unit for an opposite second tool part. According to the invention, it is provided that a punch receiving bearing part of the punch unit is designed as a ring-shaped closed stamp receiving housing and / or that a hole bushing bearing part the bushing unit is designed as a ring-shaped closed bushing housing.

The high forces acting on the stamp receiving part or the hole bushing part during the punching operation can be supported much more effectively and uniformly laterally in the ring-shaped punch receiving housing according to the invention or the annular closed hole bushing housing laterally via the adjusting elements and fixing elements than in the corresponding bearing parts with the open contours after State of the art. With the inventive use annular closed bearing housing thus a stability gain is achieved. Particularly preferred here is a specific embodiment, according to which the stamp unit has a punch receiving part with a punch and further the punch receiving bearing part. Here, in turn, an embodiment in which the punch receiving bearing member is fixedly connected to the first tool part and the punch receiving part is adjustably supported in a recess in the punch receiving bearing part by means of at least one, preferably more tuning plates and held fixable. Substantially analogously thereto, the perforated bushing unit can alternatively or additionally be a perforated bushing part with a hole contour corresponding to the punch and further the bushing bearing part. Preferably, it is then provided here that the hole bush bearing part is fixedly connected to the second tool part and the hole bushing part is supported in a recess in the bushing bearing part by means of at least one, preferably more, tuning plates position adjustable and held fixable.

It is expressly pointed out that a particularly advantageous punching unit is obtained by the use of both a punch unit designed according to the invention and in connection with a punched-bushing unit designed according to the invention. In principle, however, it is also possible to combine an adjustable punch unit formed according to the invention with a differently constructed punch bushing unit according to the prior art. Likewise, if appropriate, an inventive trained hole bushing unit can be used in conjunction with a stamp unit according to the prior art, in particular an adjustable punch unit according to the invention can be combined with a non-adjustable punch holder plate or Buchsenhalteplatte. Such arrangements should also be expressly included in the scope of protection.

In a preferred embodiment, for conventional applications, both the, preferably plate-shaped and annular, stamp receiving housing and / or the, preferably plate-shaped and annular, Lochbuchsen housing in a plan view a triangular outer contour, preferably in the shape of an isosceles triangle, optionally rounded Triangle points, have. Alternatively, the outer contour can also be designed differently in accordance with the respective site of use, in particular in nested arrangements, and adapted to the hole spacing geometry. Alternatively, two or optionally further punch receiving parts or perforated sleeve parts may be accommodated in a punch receiving housing and the associated bushing housing, whereby an even more compact arrangement is possible.

For a uniform contact pressure and a uniform force support is further proposed that mounting holes on the annular area offset circumferentially, preferably in the corner areas, are arranged. Alternatively or additionally, it may also be provided for the purpose just mentioned that the punch receiving housing and / or the hole bushing housing each have a bottom wall.

In a further concretization, it is proposed that the recess in the punch receiving housing and / or the recess in the bushing housing in a plan view in a triangular shape approximately in the manner of a right triangle, possibly with rounded corners designed. In this case, the catheter surfaces extending in the punching direction form support surfaces for the tuning plates and the hypotenuse surface forms a support surface for a locking plate. A right angle between the tuning plates allows a stable support in conjunction with a suitable variation of the position adjustment. According to the shape of the recess and the punch receiving part and / or the hole bushing part is formed in a plan view with a reduced by the possible adjustment shape, so that thereby between the recess in the punch receiving housing or in the bushing housing and the punch receiving part or the Perforated bushing part each results in a circumferential adjustment gap, in which different tuning plates and the locking plate can be used depending on the requirements and setting conditions.

In a particularly preferred further embodiment, the catheter-side support surfaces for the tuning plates both in the recess in the punch receiving housing and the associated support surfaces on the punch receiving part and / or the kathetenseitigen support surfaces in the recess in the bushing housing and the associated support surfaces on the bushing part against a Angled at an angle or obliquely parallel to the hole punch direction reference surface. These Angular or oblique position can be, for example, between 2 ° and 10 °, preferably 5 °. By this angled or oblique design of the support surfaces, a particularly advantageous self-locking is achieved.

In addition, the catheter-side support surfaces should each have an edge web with which the tuning plates are secured in the stripping. The hypothenusenseitigen support surfaces for the locking plates should, however, be aligned parallel to the punch direction, wherein each directed in a side wall of the punch receiving housing and / or the Lochbuchsen housing on the locking plate threaded hole is mounted, into which a retaining screw for the locking plate is screwed. The retaining screw is used in setup, without locking plate as a fixation for the punch receiving part, or socket receiving part. In series operation, the retaining screw secures the locking plate against falling out.

In order to prevent lateral slipping of the locking plate, the respective hypothenusite-side support surface for the locking plate can be bounded laterally by flanks.

Reference to a drawing, an embodiment of the invention will be explained.

They show by way of example:

1 a top view of a punch unit of a punch unit,

2 to 4 Sectional views through the hole unit after 1 .

5 a perspective view of the hole unit after 1 , and

6 a plan view of two Lochbuchseneinheiten the punch unit.

The punching unit shown in the drawing for a forming tool (not shown) for punching openings in a sheet metal blank is constructed in two parts and consists of a stamp unit 1 ( 1 to 5 ) for attachment to a tool upper part of the forming tool and from a bushing unit 2 (in 6 two hole bushing units are exemplified) for attachment to a lower tool part of the forming tool in the manner of a press tool.

The stamp unit 1 consists of a plate-shaped and annular punch receiving housing 3 with a triangular in plan view outer contour, here for example approximately in the shape of an isosceles triangle with rounded triangular points. The stamp receiving housing has here as a further optional feature also a bottom wall 4 on. Furthermore are. here by way of example three fastening bores 5 arranged in the corner regions of the triangular ring shape. A recess 6 in the annular punch receiving housing 3 is triangular in plan view as a right triangle with here only optionally rounded corners designed with approximately equal length of catheter surfaces, which serve as support surfaces for Abstimmplatten 7 and 8th are used. The hypotenuse surface of the punch receiving housing opposite the catheter surfaces 3 has the function of a support surface for a locking plate 9 ,

In the recess 6 of the stamp holder housing 3 is a stamp receiving part 10 with a punch 11 used, which in the plan view of the shape of the recess 6 in a reduced size, creating a circumferential adjustment gap 12 between the recess 6 and the stamp receiving part 10 is formed, in the for an individual position adjustment of the stamp receiving part 10 the tuning plates 7 . 8th and the locking plate 9 are used positively.

As from the sectional views in the 2 and 3 can be seen, are the support surfaces for the tuning plates 7 . 8th both in the recess 6 in the punch holder housing 3 as well as the associated support surfaces on the stamp receiving part 10 opposite a reference surface extending parallel to the punching direction 13 at an angle fourteen only 5 ° obliquely from here. The tuning plates 7 . 8th are also by an edge bridge 15 . 16 in the direction of a stripping force (arrow 17 ) secured.

As in particular from 4 can be seen, the support surfaces for the locking plate 9 not inclined but aligned parallel to the punch direction. In a side wall of the stamp holder housing 3 on the support surface for the locking plate 9 is a threaded hole for a retaining screw 18 arranged, with which the locking plate 9 secured against falling out. As in particular from 1 can be seen, is the locking plate 9 laterally by flanks 19 on the stamp receiving part 10 supported against a lateral displacement.

In 6 are two each of a stamp unit 1 associated hole bushing units 2 shown in a plan view. A bushing unit 2 is here (just with slightly modified dimensions) like the stamp unit 1 constructed with a plate-shaped and annular hole bushing housing 20 with an example here triangular outer contour and one here also only exemplary triangular recess into which a correspondingly shaped hole bushing part 21 used and by means of obliquely employed Abstimmplatten 22 . 23 and a locking plate 24 is supported. The two adjacent hole bushings housing 20 In an alternative embodiment, they can also be realized, if appropriate, combined in one component.

In contrast to the stamp unit 1 is in the bushing unit 2 or in the hole bushing part 21 no punches 11 but a hole contour associated with this 25 brought in. Optionally, a replaceable cutting bushing can also be used here.

• – Das Stempelaufnahmeteil 10 wird durch allseitigen Formschluss im Stempelaufnahme-Gehäuse 3 gehalten. Ebenso wird das Lochbuchsenteil 21 durch allseitigen Formschluss im Lochbuchsen-Gehäuse 20 gehalten.
• – Der Aufbau ist symmetrisch, so dass die Bauteile spiegelbar sind.
• – Durch die dreieckige Anordnung der Verschraubungen 5 ergibt sich eine optimale Druckverteilung.
• – Das Stempelaufnahmegehäuse 3 weist ebenso wie das Lochbuchsengehäuse 20 eine ringförmig geschlossene Gehäusekontur auf, wodurch eine steife Konstruktion ohne Bauteildeformation gebildet ist.
• – Es ist nur ein relativ kleiner Bauraum erforderlich, wobei mehrere, insbesondere drei, Größenvarianten möglich sind.
• – Durch die dreieckige Außenkontur ist ein kompaktes Schachteln mehrerer nebeneinander liegender, verstellbarer Locheinheiten möglich, wie dies in 6 mit dem Distanzpfeil 26 angegeben ist.
• – Es ist ein modularer Aufbau möglich.
• – Es wird eine Selbsthemmung durch die schrägen Flächen erzielt.
• – Verwendung von Schnittbuchsen im Lochbuchsenteil 21; dadurch schneller Wechsel bei Beschädigung möglich.
• – Stanzen von mehreren Löchern in einer Einheit möglich.
• – Prozesssicher, da kein Herausfallender Abstimmplatten möglich ist.

The illustrated embodiment has in summary the following advantages, in particular over the generic state of the art:

• - The stamp receiving part 10 is due to all-round positive connection in the stamp receiving housing 3 held. Likewise, the hole bushing part 21 Through all-round positive connection in the bushing housing 20 held.
• - The structure is symmetrical, so that the components are mirrored.
• - Due to the triangular arrangement of the screw connections 5 results in an optimal pressure distribution.
• - The punch holder housing 3 has as well as the hole bushing housing 20 an annular closed housing contour, whereby a rigid construction is formed without component deformation.
• - It is only a relatively small space required, with several, in particular three, size variants are possible.
• The triangular outer contour makes it possible to compactly nest several adjacently positioned, adjustable punching units, as shown in FIG 6 with the distance arrow 26 is specified.
• - It is a modular design possible.
• - It is achieved by the inclined surfaces self-locking.
• - Use of bushings in the bushing part 21 ; thus faster change possible with damage.
• - Punching of several holes in one unit possible.
• - Process-safe, since no falling out of the tuning plates is possible.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007037757 A1 [0003]
• DE 102005022757 B3 [0004]

Claims (14)

Punching unit for a forming tool for punching apertures in flat workpieces, with a punch unit ( 1 ) for a first tool part and an associated bushing unit ( 2 ) for an opposite second tool part, characterized in that a punch receiving bearing part ( 3 ) of the stamp unit ( 1 ) as a ring-shaped closed stamp receiving housing ( 3 ) is formed and / or that a hole bushing bearing part of the bushing unit ( 2 ) as a ring-shaped closed bushing housing ( 20 ) is trained. Punch unit according to claim 1, characterized in that the punch unit ( 1 ) a stamp receiving part ( 10 ) with a punch ( 11 ) and the stamp receiving bearing part ( 3 ) having. Punch unit according to claim 2, characterized in that the punch receiving bearing part ( 3 ) is fixedly connected to the first tool part and the punch receiving part ( 10 ) in a recess ( 6 ) in the punch receiving bearing part ( 3 ) by means of at least one tuning plate ( 7 . 8th ), preferably several tuning plates ( 7 . 8th ), adjustably supported and held fixable. Punch unit according to one of the preceding claims, characterized in that the perforated bushing unit ( 2 ) a hole bushing part ( 21 ) with a punch ( 11 ) corresponding hole contour ( 25 ) and the bushing bearing part has. Punch unit according to claim 4, characterized in that the hole bush bearing part is fixedly connected to the second tool part and the hole bushing part ( 21 ) in a recess in the bushing bearing part by means of at least one tuning plate ( 22 . 23 ), preferably several tuning plates ( 22 . 23 ), positionally supported supported and held fixable, Punch unit according to one of the preceding claims, characterized in that the, preferably plate and annular, punch receiving housing ( 3 ) and / or the, preferably plate and ring, Lochbuchsen housing ( 20 ) has a triangular outer contour in a plan view, or that the outer contour of the, preferably plate and annular, stamp receiving housing ( 3 ) and / or, preferably plate and annular, bushing housing ( 20 ) is adapted in a plan view, in particular in nested arrangements, the hole spacing geometry, or that in a punch receiving housing and the associated Lochbuchsen housing two or more punch receiving parts ( 11 ) or perforated bushing parts ( 21 ) are included. Punch unit according to one of the preceding claims, characterized in that fastening bores ( 5 ) are circumferentially offset on the annular region, preferably in the corner regions, are arranged. Punch unit according to one of the preceding claims, characterized in that the punch receiving housing ( 3 ) and / or the bushing housing ( 20 ) a bottom wall ( 4 ) having. Punch unit according to one of the preceding claims, characterized in that the recess ( 6 ) in the punch receiving housing ( 3 ) and / or the recess in the bushing housing ( 20 ) in a plan view is triangular in the manner of a right-angled triangle, preferably with rounded corners, is formed, wherein the catheter surfaces support surfaces for the tuning plates ( 7 . 8th ; 22 . 23 ) and the Hypothenusenfläche a support surface for a locking plate ( 9 ; 24 ), and that the stamp receiving part ( 10 ) and / or the bushing part ( 21 ) in plan view a reduced by the possible adjustment shape according to the recess in the stamp receiving housing ( 3 ) and / or in the bushing housing ( 20 ), wherein in the circumferential adjusting gap formed thereby ( 12 ) the tuning plates ( 7 . 8th ; 22 . 23 ) and the locking plate ( 9 ; 24 ) are used. Punch unit according to claim 9, characterized in that the catheter-side support surfaces for the tuning plates ( 7 . 8th ) both in the recess ( 6 ) in the punch receiving housing ( 3 ) as well as the associated support surfaces on the stamp receiving part ( 10 ) and / or the catheter-side support surfaces in the recess in the bushing housing ( 20 ) and the associated support surfaces on the hole bushing part ( 21 ) with respect to a parallel to the puncture direction extending reference surface ( 13 ) at an angle and / or at an angle (angle fourteen ) are employed. Punch unit according to claim 10, characterized in that the angular and / or oblique position of the catheter-side support surfaces between 2 ° and 10 °, preferably at 5 °, is (angle fourteen ). Punch unit according to claim 10 or 11, characterized in that the catheter-side support surfaces each have an edge web ( 15 . 16 ), with which the tuning plates ( 7 . 8th ; 22 . 23 ) in the direction of a stripping force (arrow 17 ) are secured. Punch unit according to one of claims 9 to 12, characterized that in each case the hypothenus-side support surfaces for the locking plates ( 9 ; 24 ) are aligned parallel to the punch direction, and that in each case in a side wall of the punch receiving housing ( 3 ) and / or the bushing housing ( 20 ) one on the locking plate ( 9 ; 24 ) directed threaded bore is in which a retaining screw ( 18 ) for the locking plate ( 9 ; 24 ) is screwed. Punch unit according to claim 13, characterized in that the hypothenus-side support surface for the locking plate ( 9 ; 24 ) on the stamp receiving part ( 10 ) and / or at the bushing part ( 21 ) laterally by flanks ( 19 ) is limited.

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