| 摘要 |
A method of manufacturing thin-walled pipes or products having a similar cross section with improved formability at a high speed without damaging or deforming their edges. Ordinary cold rolling units B1, B2-B4, CL, FS, SQ are used with which a belt conveyor comprising a flexible flat belt (1) is combined. A raw material (10) is placed on the flat belt (1) and passed through forming rolls, whereby the raw material (10) is cold rolled so as to be covered with the flat belt (1). This method can reduce the ratio of the wall thickness to the outer diameter (t/D x 100) of a pipe to less than 1%, and it also improves formability and speed without damaging or deforming pipe edges.
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