Title:
【発明の名称】パイプ曲げ加工方法及びその装置
Document Type and Number:
Japanese Patent JPH0661585
Kind Code:
B2
Abstract:
A method and an apparatus for bending pipes by clamping one end of the pipe between a formed roll and a rotary base and by turning the rotary base so that the pipe may be bent along the outer periphery of the formed roll. A mandrel supported by a mandrel bar is arranged inside the pipe at a position corresponding to a position slightly behind where the pipe is clamped between the formed roll and the rotary base. The rear end of the mandrel bar is held in place by a pressurizing device so that the mandrel can be held fixed at said predetermined position inside the pipe. At the same time, a vibrating device attached to the mandrel bar causes the mandrel to continuously reciprocate in the axial direction of said mandrel bar, whereby flattening of the pipe which occurs when the pipe is bent along the outer periphery of the formed roll can be corrected by the reciprocation of the mandrel. As a result, the radius of curvature R of the pipe can be made smaller than R=3D, where D is the diameter of the pipe.
Inventors:
Shizuka Tasaki
Tarui Masaaki
Tarui Masaaki
Application Number:
JP8833590A
Publication Date:
August 17, 1994
Filing Date:
April 04, 1990
Export Citation:
Assignee:
Taiyo Co., Ltd.
International Classes:
B21D7/024; B21D7/025; B21D9/07; (IPC1-7): B21D7/025
Attorney, Agent or Firm:
Takeda Kenichi
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