| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing apparatus and a manufacturing method of the bending part of a multihole tube by which a good bending part is formed without deforming the bending part of the multihole tube the inside of which is divided with connecting walls. SOLUTION: This manufacturing apparatus of the bending part consists of a bending die 6 with which the bending part 5 having a prescribed bend radius R is formed on the multihole tube 1 by pressing against and bringing the outer periphery of the multihole tube 1 into contact with the tube, a pressure die 7 for pressing the multihole tube 1 against this bending die 6, a holding part 8 for bending the tube along the bending die 6 by moving one end of the multihole tube 1 and core bar parts 10 by which the inner walls of communicative hole parts 3, 3 are supported by being respectively inserted into the communicative hole parts 3, 3 of the multihole tube 1. The core bar parts 10 are composed of the main bodies 11 of the core bars for supporting the inner surfaces of the communicative holes 3, 3 when forming the bending part 5 and a supporting means 12 for supporting the main bodies 11 of the core bars freely rotatably in accordance with the movement of the inner surfaces of the communicative hole parts 3, 3 when forming the bending part 5. COPYRIGHT: (C)2005,JPO&NCIPI
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