| 摘要 |
PROBLEM TO BE SOLVED: To suppress rough surface, and to omit a mirror finishing process after the drawing by setting a stainless steel mirror finished stock whose hardness is not less than the specified value as a blank to a die having the inclination of not more than the specified value on a blank hold surface, setting the wrinkled holding pressure to a specified value, and drawing the blank. SOLUTION: A stainless steel mirror finished stock of >=HV 330 in Vickers hardness is used for a blank S. The blank S is set to a die 3 having the angleθof inclination of a blank holding surface of <=15 deg. in angle on the holding surface of blank holders 1R, 1L. The blank S is set to the die having the radius of curvature in which the angle formed between the line to connect a center of the blank S when the blank is held to an outer peripheral edge of the blank S before the holding and the line to connect the center during the holding to the outer peripheral edge after the holding on a blank hold part. The blank is machined by applying the wrinkled holding pressure of 5-40 N/mm2.
|
