| 摘要 |
PROBLEM TO BE SOLVED: To secure the desired quality of coating by finishing the opening edge part of a depressed part formed by overhang caulking into a gentle shape. SOLUTION: After setting a knuckle bracket 2 in a prescribed position in a forming device by laminating it on a tube 1 comprises a strut for automobiles, the overhang caulking is performed by cooperation of a die 5 arranged inside the tube 1 and a caulking punch 6 arranged outside the knuckle bracket 2. After that, the depressed part 4 where is formed by the overhang caulking is positioned in a prescribed position to a chamfering punch 7 by rotating the joined tube 1 and the knuckle bracket 2 and a gentle roundness so that the quality of later coating is not hindered is performed in the opening edge part 4a by performing chamfering to the opening edge part 4a of the depressed part 4 by the chamfering/forming part 7a of the chamfering punch 7. COPYRIGHT: (C)2006,JPO&NCIPI
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