| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a constitution of bending a steel tube by compressing the steel tube along its axial direction. SOLUTION: The axial compressive force is applied to an annular heated portion 2 of a steel tube 1 held by a front pressing plate 15 and a rear pressing plate 16 by delivering a jack 22 and pulling by a jack 21. At the same time, by pressing the steel tube 1 by a push roller 12, the shear force is applied to the annular heated portion 2 of the steel tube 1. Since the axial compressive force and the shear force are applied, the steel tube 1 is bent in an arc shape. Since the axial compressive force and the shear force are simultaneously applied to the annular heated portion 2 of the steel tube 1, the steel tube can be bent with the axial compressive load smaller than that for the bending only by the compressive force. Thus, the sizes of the jacks 22 and 21 and a chain 20 can be reduced, and the apparatus can be miniaturized thereby. COPYRIGHT: (C)2010,JPO&INPIT
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