Method and device for forming a pipe
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United States of America Patent
Stats
-
May 9, 2006
Grant Date -
Sep 30, 2004
app pub date -
Mar 25, 2004
filing date -
Mar 31, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and a device are proposed which accurately and efficiently form a pipe with a bending machine only, without using any correcting devices. A plate having holes is fed into a bending machine in which under an upper roll, lower rolls parallel thereto are arranged, and a pipe is formed during a rough forming step and a fine forming step. In the rough forming step, bending is performed so that the plate will have a required diameter at hole portions. In the fine forming step, the hole portions are not pressed for bending while other portions are rolled so as to become closer to a required diameter to form the pipe.
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