DE19801203B4 - Apparatus for punching flowing drawn parts - Google Patents

Abstract

contraption for punching flowing drawn parts, especially for punching more fluent Drawing sheets, with a sheet holder (8), a pressure piece (1), which sublime over a drawing plane (9) of the sheet metal holder (8) protrudes and perpendicular to the drawing level (9) is displaceably mounted in the blank holder (8), and a punch (2), which is slidably mounted in the pressure piece (1), characterized in that on one of the drawing plane (9) facing away End the pressure piece (1) and the punch (2) over a pad (5) are positively connected to each other.

Description

The The invention relates to a device for punching flowing drawn parts according to the preamble of Claim 1.

In the processing of deep-drawn parts, which are also to be perforated, it is known to form the perforations only after deep drawing in an additional device. Furthermore, it is for example from the DE 35 39 418 C2 known to provide a punch in a discharge punch a thermoforming tool. However, such devices are very limited due to play in guides of the punch and play in hydraulic drives, which act on the punch, and due to lack of pressure forces in the hole process in the accuracy of the perforation. Furthermore, it comes through heavy wear of the cutting tools to short maintenance intervals, ie short life of thermoforming tools.

From the DE 88 77 92 C is a cutting and embossing tool is known, which is particularly suitable for use in presses with large, unobstructed stroke. Here, the die is guided on the cutting die of the tool and is supported on this by means of a rubber pad so that it protrudes in the rest position with its lower edge slightly beyond the working edges of the cutting punch out.

Of the present invention is based on the object, a device of the above type and to provide a drawing tool, with which it is possible is, in the final phase of a drawing process by inclusion of a Hole device to perform an accurate punching and / or cutting, wherein the service life of the cutting elements are as high as possible.

These The object is achieved by a Device solved with the features of claim 1. advantageous Embodiments of the invention are specified in the dependent claims.

It is provided according to the invention, that at a side facing away from the drawing end end of the pressure piece and the Punch over a pad are positively connected to each other.

This has the advantage that through the cutting process with a cushion displacement principle previous wear reduced become. Furthermore, the inventive device for punching has the Advantage that drawn parts according to this combined machining method in high quality, i.e. high dimensional accuracy, and inexpensive to produce are. Such a drawing tool improves the economy of the manufacturing processes of drawn parts by increasing productivity and makes another extra Tools for subsequent Punching the drawn parts superfluous.

The Service life, for example, of such punches used is increased and in the case of replacement, the stamp becomes easy and fast from a sliding seat without big Removed or replaced tool or assembly effort. Further results the advantage that two essential processes interact: in the decisive area of the drawn part to be punched is a better grip of the punched part to be punched during the Lochens generated and the relatively short-lived displacement leads to Ziehebene to a low-wear Perforation. Furthermore, all conceivable geometric stamp shapes used.

In an advantageous embodiment is between the pad and the punch a pressure insert and preferably around the pressure insert and on the pad a pressure ring arranged in a detachable way Connection is made to the pressure piece.

To the Stripping of the drawn part after punching is between the pressure piece and the Punch a spring means, in particular a plate spring provided which the punch in a directed away from the drawing level Direction biased.

For a direct and good power transmission through the pad is in a particularly advantageous manner at one of the drawing level opposite end of the pad arranged an abutment.

Conveniently, the upholstery is made of a rubber-elastic material and Preferably, the drawn part is a metal sheet.

Further Features, advantages and advantageous embodiments of the invention arise from the dependent ones claims, and from the following description of the invention with reference to the attached Drawing. This shows in

1 a first preferred embodiment of the device according to the invention in sectional view and

2 A second preferred embodiment of the device according to the invention in sectional view.

In the 1 illustrated first preferred embodiment of the device according to the invention comprises a pressure piece 1 , a punch 2 , a print job 3 , a pressure ring 4 , a cushion 5 , a plate spring 6 , an abutment 7 and one blankholder 8th , The surface of the sheet metal holder 8th forms a drawing level 9 ,

In the device according to the invention is a in a conventional blank holder 8th exactly guided pressure piece 1 raised to the drawing level 9 displaced embedded. With a screw connection is on the pressure piece 1 the pressure ring 4 provided, which on a rubber-elastic pad 5 rests. Through a self-adjusting equality to the drawing level 9 between the pressure piece 1 and the sheet holder 8th creates a volume shift of the totally enclosed pad 5 , This equality between pressure piece 1 and tin holder 8th takes place by a in the direction of the arrow 10 fitting, not shown in detail deep-drawing workpiece, such as a metal sheet.

They are in the upholstery 5 resulting reaction force is over the pressure application 3 in a predetermined ratio on the punch 2 transmitted and pushes it against the spring force of the diaphragm spring 6 from the pressure piece 1 out and about the drawing level 9 out into a predetermined immersion depth to a perforated die. The area ratios of the upholstery 5 adjacent surfaces of pressure ring 4 to pressure application 3 determine, for example, the power transmission ratio. The pressure application 3 is from the pressure ring 4 axially to the punch 2 guided and is done after the punching process by means of arranged over a piston crown diaphragm spring 6 moved back to the starting position, which causes a stripping of the perforated drawn part.

This in 1 illustrated apparatus for punching is preferably integrated in a drawing tool and is in the representation of 1 at rest. The pull 9 upstream pressure piece 1 is with the pressure ring 4 releasably connected, and both are based on the upholstery 5 from. The central or center to the upholstery 5 opposite pressure application 3 is in the pressure ring 4 out, which in turn in usual in drawing dies holder 8th is guided. The pressure application 3 moves as a result of the occurring, from the pad 5 By reaction of volume resulting reaction force opposite to the direction of movement of the components 1 and 4 axially together with the loose on it and in the pressure piece 1 guided stamp 2 from the pressure piece 1 about the drawing level 9 out in the direction of the perforated die.

After the punch 2 has reached its predetermined immersion depth in the perforated die, takes place after opening the device, the relaxation of the pad 5 , and those on the puncher 2 acting plate spring 6 pulls the punch 2 back into the pressure piece 1 into it, whereby the deep-drawn and perforated drawn part stripped off after relaxation and again the in 1 shown starting position is taken.

The second embodiment according to 2 includes a modified seat of the punch 2 , With the seat is a corresponding vote on the desired action with respect to, for example, the immersion depth of the punch 2 , Here are common punch lengths, depending on the milled punch seat position, used variably and thus a precise vote of the depth of immersion of the punch 2 possible in the perforated matrix. The plate spring 6 acts on the pressure application 3 ,

This combined drawing and punching tool can also be made variably deviating in its design. The respective tool design depends on the desired deep-drawing process and punching process. For example, by tool-related specifications of a totally enclosed pad 5 be departed to a volume shift between a chamber as a cushion receiving and the pad 5 achieving, by additionally varying one of the Shore hardness of the pad 5 other possibilities with higher security, for example, with regard to prone stamp shapes, can be achieved.

1

Pressure piece

2

punch

3

pressure applications

4

pressure ring

5

pad

6

Belleville spring

7

abutment

8th

blankholder

9

draw level

10

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Claims (7)

Device for punching flowing drawn parts, in particular for punching flowing drawing sheets, with a sheet holder ( 8th ), a pressure piece ( 1 ), which raised above a Ziehebene ( 9 ) of the sheet holder ( 8th ) protrudes and perpendicular to Ziehebene ( 9 ) slidable in the blank holder ( 8th ) is stored, and a punch ( 2 ) which is displaceable in the pressure piece ( 1 ) is mounted, characterized in that at one of the drawing level ( 9 ) facing away from the pressure piece ( 1 ) and the punch ( 2 ) over a pad ( 5 ) are positively connected with each other. Device according to claim 1, characterized in that between the pad ( 5 ) and the punch ( 2 ) a printing insert ( 3 ) is arranged. Apparatus according to claim 2, characterized in that between the pressure piece ( 1 ) and the punch ( 2 ) a plate spring ( 6 ) is provided, which the punch ( 2 ) in one of the drawing level ( 9 ) biased away direction. Device according to one of claims 1 to 3, characterized in that between the pressure piece ( 1 ) and the upholstery ( 5 ) a pressure ring ( 4 ) is arranged. Device according to one of claims 1 to 4, characterized in that at one of the drawing level ( 9 ) facing away from the pad ( 5 ) an abutment ( 7 ) is arranged. Device according to one of claims 1 to 5, characterized in that the pad ( 5 ) is made of a rubber-elastic material. Device according to one of claims 1 to 6, characterized that the drawn part is a metal sheet.