公开(公告)号：EP1654078A1

公开(公告)日：2006-05-10

申请号：EP04738786.5

申请日：2004-06-25

申请人： Willy Voit GmbH & Co. Kg

发明人： CLAUS, Ronald ,  MERTZ, Andreas

IPC分类号： B21D22/16

CPC分类号： B21D41/04 ,  B21D22/16

摘要： The invention relates to a method for producing one-piece hollow bodies from a tubular workpiece (1), especially hollow shafts, comprising at least one stepped section. In a first step, at least one conical region is formed on the tubular workpiece (1), said region connecting a first workpiece section having a larger diameter to a second workpiece section having a smaller diameter, and in a second step, at least one region of the workpiece (1) is formed. The aim of the invention is to provide one such method that enables an application-optimised hollow body (1) to be created with a higher level of flexibility in the shaping and production thereof, and low production costs. To this end, at least in the second step, the forming process involves flow-turning, reducing, thickening or wearing down the contour, or a combination of said operations, the formed region being cooled during the forming process.