公开(公告)号：DE10008688C1

公开(公告)日：2001-02-08

申请号：DE10008688

申请日：2000-02-18

Applicant: SMS DEMAG AG

Inventor： KOLBE MANFRED ,  TOPUETH ARNO ,  HAEUSLER KARL HEINZ

IPC: B21D3/14 ,  B21D39/20 ,  B21D39/08 ,  B21C37/30

Abstract: The mechanical pipe expander is a multi-edged pyramid with segments on the mantle surfaces, which are moved radially by an axial movement of the pyramid in relation to them. A lubricant cladding (5) is between the mantle surfaces of the pyramid (2) and the segments (3). The lubricant cladding (5) is a compound carbon fiber material with a polymer matrix containing graphite powder.

公开(公告)号：DE10024647A1

公开(公告)日：2001-12-06

申请号：DE10024647

申请日：2000-05-17

Applicant: SMS DEMAG AG

Inventor： HAEUSLER KARL HEINZ

IPC: B21C1/24 ,  B21C1/32 ,  B21C5/00 ,  B21D41/02 ,  B21D39/10

Abstract: The method involves inserting a mandrel (1) in the pipe beginning (3), whose outer diameter is smaller along a first section than the inner diameter of the pipe beginning and corresponds along a third section to the inner diameter of the pipe. A roller set around the pipe has radially-adjustable rollers and is used to constrict a part axially spaced from the pipe end without reducing the wall thickness. The pipe is pulled towards a second part of the mandrel, in which its diameter enlarges to that of the third section, using the rollers, so that the wall thickness is continuously reduced. At the beginning of the third section, the finished wall thickness is achieved, and the pipe is then rolled out as far as the pipe end. The mandrel is pulled out and one or more pipe-drawing mandrels are inserted, in the conventional manner. An Independent claim is included for a roller machine for implementing the method.

公开(公告)号：PL347567A1

公开(公告)日：2001-11-19

申请号：PL34756701

申请日：2001-05-16

Applicant: SMS DEMAG AG

Inventor： HAEUSLER KARL HEINZ

IPC: B21C1/24 ,  B21C1/32 ,  B21C5/00 ,  B21D41/02 ,  B21B19/12

Abstract: The method involves inserting a mandrel (1) in the pipe beginning (3), whose outer diameter is smaller along a first section than the inner diameter of the pipe beginning and corresponds along a third section to the inner diameter of the pipe. A roller set around the pipe has radially-adjustable rollers and is used to constrict a part axially spaced from the pipe end without reducing the wall thickness. The pipe is pulled towards a second part of the mandrel, in which its diameter enlarges to that of the third section, using the rollers, so that the wall thickness is continuously reduced. At the beginning of the third section, the finished wall thickness is achieved, and the pipe is then rolled out as far as the pipe end. The mandrel is pulled out and one or more pipe-drawing mandrels are inserted, in the conventional manner. An Independent claim is included for a roller machine for implementing the method.