Method for producing a hollow shaft

Abstract

A method for producing a hollow shaft from a tubular preform by pressure rolling shapes each end of the preform using at least one forming roller. A tubular preform with a round or polygonal cross-section is used, and the preform is held on a workpiece holder in the central tube region during the entire production process until the hollow shaft is completed.

1 . A method for the production of a hollow shaft from a tubular preform by means of pressure rolling, wherein the two ends of the preform are shaped using at least one forming roller, in each instance, wherein a tubular preform ( 1 ) having a round or polygonal cross-section is used, and the preform ( 1 ) is held in the center tube region ( 1   a ) by one workpiece holder ( 2 ) during the entire production process, until the hollow shaft is finished. 
     
     
         2 . The method according to  claim 1 , wherein
 a drawn or welded preform ( 1 ) is used.   
     
     
         3 . The method according to  claim 1 , wherein
 the two ends ( 1   b,    1   c ) of the preform ( 1 ) are shaped at the same time, at least in part.   
     
     
         4 . The method according to  claim 1 ,
 wherein   at least one end ( 1   b,    1   c ) is stepped once or multiple times.   
     
     
         5 . The method according to  claim 1 , wherein an outside and/or inside profiling ( 5 ,  6 ) is introduced into at least one end ( 1   b,    1   c ). 
     
     
         6 . The method according to  claim 5 , wherein
 before introduction of the outside and/or inside profiling ( 5 ,  6 ), an internal mandrel, if necessary a profiled one ( 7 ,  7 ′,  8 ,  8 ′), is axially introduced into the at least one end ( 1   b,    1   c ).   
     
     
         7 . The method according to  claim 6 , wherein
 an internal mandrel ( 7 ,  7 ′,  8 ,  8 ′) is introduced into both ends ( 1   b,    1   c ), in each instance.   
     
     
         8 . The method according to  claim 7 , wherein
 the two internal mandrels are connected with one another at their end faces, with force fit and/or shape fit.   
     
     
         9 . The method according to  claim 1 , wherein
 the shaping takes place, at least part of the time, under the application of heat.