| 摘要 |
PROBLEM TO BE SOLVED: To perform high-accuracy press working by forming a circular recess for arranging a disk motor on by rear extruding, and additionally performing correction by a correcting process. SOLUTION: A circular region is set on a frame plate 8. A motor-fitting hole 24 for fitting a disk motor is formed in the center part of the circular region, by a fitting hole boring process. Next, the circular region is pressed down in the direction of a cross section through rear extrusion, and a circular recession 9 for arranging a disk motor on is formed by a recession forming process. Moreover, the periphery of the motor fitting hole 24 is pressed and the periphery of the motor fitting hole 24 is corrected into a flat surface. Along with it, an annular protrusion 53 which protrudes in the direction of a cross section is formed around the motor fitting hole 24. Consequently, the bottom surface to be a reference for fitting a disk motor is corrected flat, along with shape correction of the circular recession 9. Furthermore, it becomes possible to maintain the flatness of the bottom surface by the annular protrusion 53.
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