Vacuum casting method

Details Vacuum casting method Vacuum casting method

1994-06-21

1995-04-11

Batten, Jr., J. Reed

Metal founding

Process

Shaping liquid metal against a forming surface

164119, 164120, B22D 1804, B22D 1806

Patent

active

054049288

ABSTRACT:
In a vacuum casting method, a mold 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 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, an upper surface of the molten metal is moved downwardly and upwardly through at least one cycle in the molten metal retaining dome, or a swirl flow is generated in the molten metal in a stalk. Such a unique motion as the downward and upward motion or the swirl flow effectively operates to detach solid metal pieces from an inside surface of the molten metal retaining dome or the stalk to push them to an upper portion of the molten metal. As a result, the detached metal pieces are prevented from being charged into the mold cavity to thereby cause defects in a cast product.

REFERENCES:
Abstract of Japan vol. 17, No. 618 Re: Japanese Patent Publication 5-192759 published Aug. 3, 1993.

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