| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicular wheel rim having a hump portion of excellent dimensional accuracy. SOLUTION: A first claw 30 and a second claw 32 holding a work (a vehicular wheel rim) W are stopped at predetermined position. An annular supporting member 160 is abutted on an end face of a curled portion C1 of the work W. Next, a right first die 16b is closed, and the curled portion C1 and an outer circumferential wall surface are supported by a supporting die 106 of the right first die 16b. Similarly, a left first die 16a is closed, and the curled portion C1 and the outer circumferential wall surface are supported by a supporting die 106 of the left first die 16a. In addition, a roller die 124 is abutted on an inner circumferential wall surface of the work W by advancing a long rod 136. The roller die 124 is turned in the circumferential direction thereof. COPYRIGHT: (C)2005,JPO&NCIPI
|
