Metal founding – Process – Shaping a forming surface
Patent
1992-10-29
1994-08-02
Bradley, P. Austin
Metal founding
Process
Shaping a forming surface
164 72, 164 37, B22C 700
Patent
active
053336666
ABSTRACT:
A method for manufacturing a resin pattern, which does not break films in a vacuum sealed molding process and does not have secular deterioration even after repeated usages wherein a covering film is tightly contacted to an original pattern by vacuum suction, an amount of particle bodies are packed onto the covering film in a flask under the above described condition, upper portion of the flask is covered by another covering film, the tight contact of the covering film to the original pattern is released by returning the reduced pressure to normal pressure, internal pressure of the packed particle bodies is reduced, a mold cavity is formed by removing the original pattern from the packed particle bodies, a predetermined number of double solid bodies are set up in the mold cavity in the packed particle bodies which is previously turned reversely so as to be the cavity at upper side, molding resin is poured into the mold cavity, cores in the double solid bodies are withdrawn for forming through holes after hardening the resin, and the resin pattern is obtained by returning the internal reduced pressure of the packed particle bodies to normal pressure for breaking down the packed particle bodies.
REFERENCES:
patent: 984461 (1911-02-01), Bayer
patent: 3065511 (1962-11-01), Leitzel
patent: 4726412 (1988-02-01), Magnan
Plastic Pattern Equipment, Steve Denkinger, Jr. Atlas Pattern Plastic Works, Jun. 1948.
Ootomo Hideo
Takeda Hiroshi
Yachi Shunichiro
Bradley P. Austin
Hitachi , Ltd.
Pelto Rex E.
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