Method and device for producing workpieces by means of internal high pressure forming

Abstract

A method for simultaneously producing at least two workpieces, separated from one another, by internal high pressure forming. A blank is inserted into a forming tool with at least two negative molds for each of the workpieces. There is at least one parting gap between each of the at least two respective negative molds and extending around each workpiece in the circumferential direction. Each parting gap defines two spaced-apart cutting edges. When the blank is acted upon by internal high pressure it comes into full contact with the forming tool inner wall. An especially simple construction is obtained for the forming tool if the cutting edges are exposed during the forming and if the blank, in the region of the at least one parting gap, penetrates into the latter during the forming, such that the cutting edges cut out a section between two respective workpieces.

1 - 2 . (canceled)  
     
     
         3 . A method for simultaneously producing at least two workpieces, separated from one another, comprising the acts of: 
 inserting a blank into a forming tool, the forming tool having in its inner wall a negative mold for each of said at least two workpieces, and at least one parting gap which is arranged between two negative molds and extends circumferentially around the workpieces, said parting gap defined by two spaced-apart cutting edges; and    applying an internal high pressure to the blank to form workpieces by deforming the blank to conform to an inner wall of each negative mold;    wherein 
 the cutting edges are exposed such that they come into contact with the blank during the forming step,  
 the blank enters the region of the at least one parting gap and the cutting edges cut out a section between the at least two workpieces, and  
 a gap width of the parting gap is dimensioned such that the at least two workpieces are parted at a calibrating pressure which is above a pressure required to conform the blank to the inner wall of each negative mold.  
   
     
     
         4 . A device for simultaneously producing at least two workpieces, separated from one another, by internal high pressure forming, comprising: 
 a forming tool into which a blank can be inserted, wherein the forming tool includes in its inner wall a negative mold for each of said at least two workpieces and at least one parting gap which is arranged between two negative molds and extends circumferentially around the workpieces, said parting gap defined by two spaced-apart cutting edges;    a feed device for feeding a pressure medium into the blank inserted into the forming tool; and    a control system which activates the feed device to apply an internal high pressure to the blank to form workpieces by deforming the blank to conform to an inner wall of each negative mold,    wherein    the cutting edges are arranged such that they come into contact with the blank during the pressure forming, 
 the at least one parting gap is arranged such that the blank enters the region of the at least one parting gap and the cutting edges cut out a section between the at least two workpieces, and  
 a gap width of the parting gap is dimensioned such that the at least two workpieces are parted at a calibrating pressure applied by the feed device which is above a pressure applied by the feed device to conform the blank to the inner wall of each negative mold.