PURPOSE: To improve pressure resistance strength and impact resistance of a plunger punch at high temp. by containing core materials of heat resistant fibers in the plunger punch.
CONSTITUTION: In a plunger punch for hot press, the plunger punch is manufactured by inserting heat-resistant fibers of ≥1,500°C m.p. as core materials 4 into an outer die 1 and punch dies 2, 3 at the time of molding these and calcining. Heat resistant fibers such as silicon carbide, silicon nitride, alumina, silica or zirconia which are woven to a net shape are used as said core materials 4. This improves the practicable pressure resistance strength at high temp. of the plunger punch and its service life. Since high pressing force can be applied at high temp. by the use of this plunger punch, a compact sintered body can be obtained.
HIROTA EIICHI
HIROTA TAKESHI
| JPS5051910A | 1975-05-09 | |||
| JPS4980107A | 1974-08-02 |