Method and apparatus for manufacturing moulds or mould parts by

Details Method and apparatus for manufacturing moulds or mould parts by Method and apparatus for manufacturing moulds or mould parts by

1994-07-08

1997-04-08

Warden, Robert J.

Plastic and nonmetallic article shaping or treating: processes

With step of making mold or mold shaping, per se

Utilizing surface to be reproduced as an impression pattern

264 405, 164 24, 1641541, 164456, 425149, B22C 1904

Patent

active

056184840

ABSTRACT:
When compacting mold sand in a mold chamber (not shown) to form a mold or mold part (not shown) by using two co-operating squeeze plates with associated patterns (not shown), in which one squeeze plate is actuated before the other one, the second squeeze plate is not acuated until the pressure in the mold chamber (or a parameter depending on or derived from this pressure) has reached a predetermined value. By proceeding in this manner it is possible to manufacture molds or mold parts in series with practically the same hardness or solidity.

REFERENCES:
patent: 4718842 (1988-01-01), Labbe et al.
patent: 4791974 (1988-12-01), Larsen
patent: 5202067 (1993-04-01), Solazzi et al.

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