| 摘要 |
PROBLEM TO BE SOLVED: To smoothly achieve the precise plastic working even when the compression pressure is low by easily and correctly align a sintered body with a die hole. SOLUTION: In achieving the plastic working on a cup-shaped sintered body 16 comprising a bottom part 61 and a cylindrical part integrated with the bottom part 61, the sintered body 16 is formed on an outer circumferential tapered surface 67 in which an outer circumferential surface of the cylindrical part is tapered off from an opening part 65 to the bottom part 61, the outer circumferential tapered surface 67 of the sintered body 16 is engaged with an opening part of a die hole 79, and then, the cylindrical part is drawn in cooperation with a punch 88 and a die 74, and the bottom part 61 is upset.
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