Patent · US Expired

Method of forming tubes or pipes

US4149399A · kind A · utility

2Cited by

4References

6Claims

0Family size

Assignee

AB Carbox · SE

Inventors

Hans Persson · Bollnäs, SE
Jan-Erik Soderstrom · Ystad, SE

Key dates

Filing date	Jan 9, 1978
Grant date	Apr 17, 1979
Priority date	—
Expiry date	Jan 9, 1998

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB21D5/015
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

In a method of forming tubes or pipes from a flat blank of a plastically deformable material, three spaced apart portions of the blank are first bent to the wanted curvature of the finished tube or pipe, so that two smaller unbent portions are obtained between the curved portions. Then, the blank is closed to essentially tubular form by means of forces acting on the curved portions, so that the principal deformation in connection with the closing is obtained in the unbent portions located between the curved portions.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.