| 摘要 |
In the production of yoke of cylindrical shape having an adjacent plane with frame at both edges of axis direction, the first process which an incomplete product contg. an adjacent plane at both edges of axis direction is produced by extrusion forming, and the second process which finishes planar distance between adjacent planes and the degree of parallel by intrusion forming. This time, the inner size of yoke must be worked with high accuracy, and the degree fo parallel must be worked with high precision too.
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