| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of bending a magnesium alloy tubular material having a round, triangular, square, pentagonal, hexagonal, polygonal, semi-circular or elliptic cross section without heating, at a large angle and a small radius. SOLUTION: In a winding and bending of the magnesium alloy pipe P, the bending is intermittently progressed by alternately combining a small-angle bending step in which the bending angle is≤10°and an idle step of 3-120 s after that. For elastoplastical uneven strain which is generated and increased in the bending part when the bending is progressed, stress relaxation of the uneven strain is performed by progressing plastic deformation caused by creep during idle time by providing the idle time while bending stress is applied without progressing the bending after the small-angle bending. COPYRIGHT: (C)2009,JPO&INPIT
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