Vacuum casting method

Details Vacuum casting method Vacuum casting method

1994-06-28

1995-10-31

Batten, Jr., J. Reed

Metal founding

Process

Shaping liquid metal against a forming surface

164119, 164120, B22D 1804, B22D 1806

Patent

active

054621070

ABSTRACT:
In a vacuum casting method, a molding cavity is reduced in pressure to a vacuum, and when a gate is opened, a molten metal which has been raised to a molten metal retaining dome is charged into the molding cavity at a high speed. When a portion of a molten metal held in a molten metal holding furnace is raised to the molten metal retaining dome via a stalk, (1) the rising speed of a portion of the molten metal is set at 5-10 cm/sec, or (2) the rising speed is varied between an early stage of the rising motion and a later stage of the rising motion. In the latter method, the rising speed at the early stage of the rising motion is set at a speed higher than 10 cm/sec, while the rising speed at the later stage of the rising motion is set at 5-10 cm/sec. Due to the rising speed control, air involvement by the rising molten metal is effectively prevented.

REFERENCES:
Patent Abstract of Japan No. JP 5-192759 Published Aug. 3, 1993.

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