公开(公告)号：DE3709691A1

公开(公告)日：1988-10-06

申请号：DE3709691

申请日：1987-03-25

Applicant: SIEMENS AG

Inventor： SCHMITZ FRIEDHELM

IPC: F28D7/16 ,  B21D39/06 ,  B21D53/08

Abstract: The present invention relates to a heat exchanger which can be produced from tubes (1c) of reduced straightness, as well as a tool (20) for producing it. In order to cut down on the scrapping of tubes due to reduced straightness and at the same time to produce a heat exchanger which is less inclined to vibrate, it is proposed to use a special tool (20) to insert tubes of reduced straightness, in particular thin-walled tubes, into the guide bores (3) of the supporting bases (2). The tool has a tip (21) and a guide mandrel which is longer than the distance (a) between two supporting bases (2). The guide mandrel straightens the end of the tube (1c), with the result that despite the reduced straightness of the tube there is no problem in introducing it into the guide bore (3). After the tool (20) has been removed, a tube of reduced straightness is supported laterally at least at some guide bores (3) so that its tendency to vibrate is reduced.