To realize die compacting of a green compact into a product shape for producing a machine part having an inclined level difference face at low cost, and to enable its production by a powder metallurgical processing.
The powder 10 of raw materials is packed into a cavity 6 in a die 1, and thereafter, a part of the powder is raked out with a powder raker, so as to produce a powder removal part 11 having an inclined level difference face 11a. Subsequently, an upper 1-punch 2-1 is inserted into the powder removal part 11, as the collapse of the level difference face 11a is prevented with the upper 1-punch 2-1, the upper 2-punch 2-2 is contacted with the non-removal part 12 of the powder, and further, the upper 1-punch 2-1 and the upper 2-punch 2-2 are lowered to a stroke end point, so as to compact a green compact 20. Even if the inclination of the level difference face 11a is wider than the angle of repose of the powder, stable compacting is made possible.
Torii Kazuhisa
Takayoshi Tagawa
Higashio Masahiro