Vacuum forming or reduced-pressure moulding

Details Vacuum forming or reduced-pressure moulding Vacuum forming or reduced-pressure moulding

1977-01-24

1978-12-12

Husar, Francis S.

Metal founding

Process

Shaping a forming surface

164 65, 164160, 164167, 164255, 164322, B22C 1522, B22D 2716, B22D 4702

Patent

active

041291646

ABSTRACT:
In a method for reduced-pressure mould production, a plurality of mould flasks are simultaneously evacuated by evacuating means, and in which production of the moulds is carried out while moving the mould flasks sequentially through a mould shaping position, a pouring position and a mould disintegrating position. Evacuation is effected by first evacuating means during a period from the beginning of mould shaping to the beginning of mould pouring and a period after pouring, and evacuation is effected more strongly by second evacuating means during the period of pouring.

REFERENCES:
patent: 3825058 (1974-07-01), Miura et al.
patent: 3843301 (1974-10-01), Hijikota et al.
patent: 3861447 (1975-01-01), Hondo
patent: 3933194 (1976-01-01), Hijikota et al.
patent: 4028455 (1977-06-01), Ueda et al.

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