Tool and Method for the Internal High Pressure Forming of a Hollow Section

Abstract

A tool ( 1 ) for the internal high pressure forming of a hollow section ( 2 ). The tool ( 1 ) is designed both for forming the hollow section ( 2 ) and for making an embossment on the outside of the hollow section ( 2 ) and for making a hole in the hollow section ( 2 ). For this purpose, the tool ( 1 ) has an embossing punch ( 11 ) displaceable transversely to the longitudinal extent of the hollow section ( 2 ) and also a perforating punch ( 13 ) arranged coaxially in the embossing punch ( 11 ).

1 - 12 . (canceled)  
     
     
         13 . A tool for forming a hollow section, comprising: 
 at least one embossing punch which is displaceable transversely to a longitudinal extent of the hollow section and which makes an embossment on the outside of the hollow section after a forming operation;    at least one perforating punch provided in the embossing punch coaxially thereto, said at least one perforating punch perforating the hollow section before or after the embossing operation; and    at least one cutting device which runs parallel to said longitudinal extent of the hollow section, having a cutting edge and displaceable in a transverse direction of the hollow section, wherein the embossing punch is arranged so that it crosses and passes through at least one cutting device in a corresponding opening during the embossing operation; and wherein tool is designed for cutting a flange on the hollow section.    
     
     
         14 . The tool as claimed in  claim 13 , wherein a side of the cutting device facing the hollow section is designed as a shaping die wall, against which the hollow section bears at least during the internal high pressure forming.  
     
     
         15 . The tool as claimed in  claim 13 , further including a bottom die and a top die which are displaceable relative to one another.  
     
     
         16 . The tool as claimed in  claim 15 , wherein the embossing punch is mounted in a displaceable manner in or on one of the top and bottom die.  
     
     
         17 . The tool as claimed in  claim 15 , wherein 
 the cutting device is integrated in one of the top and bottom die and the cutting edge forms an integral part of said one die, or    the cutting device is designed as a separate component and is fastened to one of the top and bottom die in a fixed position, or    the cutting device is arranged on one of the top and bottom die in such a way as to be adjustable in stroke.    
     
     
         18 . The tool as claimed in  claim 13 , further including a positioning device provided which, before the cutting operation or before the forming operation, presses the hollow section against a side of the cutting device which faces the hollow section.  
     
     
         19 . The tool as claimed in  claim 13 , further including at least one hold-down, which fixes the flange of the hollow section at least during the cutting operation, provided in the region of the cutting edge.  
     
     
         20 . A method of forming a hollow section according to an internal high pressure forming process, comprising: 
 making an embossment on the outside of the hollow section by an embossing punch which is displaceable transversely to the longitudinal extent of the hollow section after a forming operation;    perforating the hollow section before or after the embossing operation by at least one perforating punch arranged in the embossing punch coaxially thereto;    cutting a flange on the hollow section by a cutting device which runs parallel to the longitudinal extent of the hollow section and has a cutting edge which is displaced transversely to the longitudinal extent of the hollow section, wherein the embossing punch crosses and passes through the cutting device during the embossing operation.    
     
     
         21 . The method as claimed in  claim 20 , wherein the hollow section, after the cutting operation, bears during internal high pressure forming, against the side of the cutting device which faces the hollow section and is designed as a shaping die wall.  
     
     
         22 . The method as claimed in  claim 20 , wherein, before the cutting operation or before the forming operation, a positioning device presses the hollow section against a side of the cutting device which faces the hollow section.  
     
     
         23 . The method as claimed in  claim 20 , further comprising arranging at least one hold-down in a region of the cutting edge and fixing the flange of the hollow section at least during the cutting operation.  
     
     
         24 . The method as claimed in  claim 20 , wherein the flange is cut by closing the tool.  
     
     
         25 . The method as claimed in  claim 24 , wherein the embossing punch crosses and passes through the cutting device during the embossing operation.  
     
     
         26 . The method as claimed in  claim 24 , wherein the hollow section, after the cutting operation, bears, during the internal high pressure forming, against a side of the cutting device which faces the hollow section and which is designed as a shaping die wall.  
     
     
         27 . The method as claimed in  claim 23 , wherein before the cutting operation or before the forming operation, a positioning device presses the hollow section against that side of the cutting device which faces the hollow section.  
     
     
         28 . The method at least as claimed in  claim 24 , wherein at least one hold-down arranged in the region of the cutting edge fixes the flange of the hollow section at least during the cutting operation.  
     
     
         29 . The method at least as claimed in  claim 24 , wherein the flange is cut by closing the tool.  
     
     
         30 . The tool as claimed in  claim 16 , wherein 
 the cutting device is integrated in one of the top and bottom die and the cutting edge forms an integral part of said one die, or    the cutting device is designed as a separate component and is fastened to one of the top and bottom die in a fixed position, or    the cutting device is arranged on one of the top and bottom die in such a way as to be adjustable in stroke.    
     
     
         31 . The tool as claimed in  claim 14 , further including a positioning device provided which, before the cutting operation or before the forming operation, presses the hollow section against a side of the cutting device which faces the hollow section.  
     
     
         32 . The method as claimed in  claim 21 , wherein, before the cutting operation or before the forming operation, a positioning device presses the hollow section against a side of the cutting device which faces the hollow section.