To provide a method for bending a pipe by which the occurrence of wrinkles on the bent inner side of the thin-wall pipe is prevented during the bending in a comparatively large bend radius, and to provide an apparatus for bending the pipe which is suitable to carry out the method.
In this method for bending the pipe W by pressing the pipe W onto a bending mold 2 to be copyed into its bend shape, the pipe is pressed against the bending mold 2 while adding tube-axis tensile load to both ends of the pipe and adding drawing in the bending part of the pipe. By holding and pressing the pipe with the receiving groove part 2U of the bending mold 2 and the pressing groove part 3U of a pressing mold 3 and moving the abutting point of the pipe on the pressing groove part along the bending shape, bending and drawing are simultaneously added.
HASHIMOTO YUJI
SATO AKIO
OKADA MASAO
SAITO KOJI
YOSHIDA HIROHIDE
TAIYO KK
| JPH08238526A | 1996-09-17 | |||
| JPS61245920A | 1986-11-01 | |||
| JPS60196228A | 1985-10-04 | |||
| JPH07328726A | 1995-12-19 | |||
| JPS411215B1 |