Method and Device for Producing Flangeless Drawn Parts

Abstract

The invention relates to a method for producing flangeless drawn parts from a flat and/or preformed metal blank using a drawing punch, a blank holder and a drawing die, wherein the drawing die has at least one supporting region and at least one wall region, between which rounded run-in portions are provided, and the blank is trimmed during the drawing operation. In addition, the invention relates to a method for producing flangeless drawn parts from a flat and/or preformed metal blank comprising a drawing punch, a blank holder, a drawing die with at least one supporting region, at least one wall region and rounded run-in portions, which are provided between the supporting region and the wall region.

1 . Method for producing flangeless drawn parts from a flat and/or preformed metal blank comprising using a drawing punch, a blank holder and a drawing die, wherein the drawing die has at least one supporting region and at least one wall region between which rounded run-in portions are provided and the blank is trimmed during the drawing operation, wherein the blank is trimmed in the supporting region, while the drawing operation has not yet been completed, in such a way that the part of the blank that remains in the supporting region after trimming is completely drawn into the wall region of the drawing die when the drawing punch is moved further into the drawing die, wherein the blank is trimmed using a first cutting edge or rounded portion of the drawing punch and a recess provided in the supporting region of the drawing die. 
     
     
         2 . Method according to  claim 1 , wherein the blank holder is in contact with the region of the blank to be separated during the trimming of the blank. 
     
     
         3 . Method according to  claim 1 , wherein the blank is trimmed using a cutting edge provided on a recess of the drawing die. 
     
     
         4 . Method according to  claim 1 , wherein the blank is calibrated after trimming in the drawing die when the drawing punch reaches its end position using an edging section arranged in the drawing punch. 
     
     
         5 . Method according to  claim 1 , wherein after trimming the blank in the supporting region the blank is profiled by the edging section of the drawing punch configured as a second cutting edge which is in contact with the rounded run-in portions of the drawing die. 
     
     
         6 . Method according to  claim 1 , wherein a drawing punch is used, which provides the first and/or second cutting edge via a replaceable insertion piece in the drawing die and optionally uses a drawing die, which provides the recess in the supporting region via a replaceable insertion piece. 
     
     
         7 . Device for producing flangeless drawn parts from a flat and/or preformed metal blank for implementing a method according to  claim 1 , the device comprising:
 a drawing punch;   a blank holder;   a drawing die with at least one supporting region, at least one wall region and rounded run-in portions which are provided between the supporting region and the wall region; and   wherein the drawing punch has a first cutting edge or rounded portion which is in contact with a recess provided in the supporting region of the drawing die with a rounded portion or cutting edge such that the blank is trimmed in the supporting region during the drawing operation before the drawing punch reaches its end position, wherein the drawing die and the drawing punch are configured such that when the drawing die reaches its end position the blank is completely drawn into the wall region and forms a flangeless drawn part.   
     
     
         8 . Device according to  claim 7 , wherein the drawing die has an edging section, which compresses the blank after the blank has moved into the wall region by compressing at least the wall region of the blank when the drawing punch reaches its end position in the drawing die. 
     
     
         9 . Device according to  claim 7 , wherein an edging section of the drawing punch is configured as a second cutting edge and the second cutting edge enables profiling of the trimmed blank during the drawing operation in contact with the rounded run-in portions. 
     
     
         10 . Device according to  claim 7 , wherein replaceable insertion pieces are provided for provision of the recess in the drawing die. 
     
     
         11 . Device according to  claim 7 , wherein replaceable insertion pieces are provided for provision of the first cutting edge and/or the edging section of the drawing punch.