| 摘要 |
PURPOSE:To seasily set a sintered body and to improve the dimensional accuracy and strength thereof by inserting the sintered body into a die and compressing the same with a fixed punch and moving punch, then taking the sintered body out of the die, upsetting the body and again inserting the body into the die and compressing the same. CONSTITUTION:A metallic mold 1 consisting of the die 2, an upper punch 3 which is the moving punch and a lower punch 4 which is the fixed punch is attached to a press device A. The sintered body 5 is inserted into the hole 6 of the die 2 and the punch 3 is lowered to compress the sintered body between said punch and the lower punch 4. The compressing operation is once stopped at about half the total intended amt. of compression. The sintered body 5 which is compressed and set mainly in the upper half part it then taken out of the die, and is again inserted into the die 2 after upsetting. The sintered body is compressed for the remaining half part in the same manner s mentioned above. The sintered body 5 having no uneven strength is thus obtd. without generating a difference in density between the upper and lower parts of the sintered body 5.
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