Metal founding – Process – Shaping a forming surface
Patent
1978-05-17
1979-09-11
Baldwin, Robert D.
Metal founding
Process
Shaping a forming surface
164160, B22C 902
Patent
active
041672062
ABSTRACT:
A method for forming a sprue and a communication-hole in a vacuum-sealed mould, and an apparatus for forming the same. This method inlcudes steps of: laying a shield film over a pattern and a sprue forming pattern or a communication hole forming pattern; assembling the pattern with a moulding flask; charging a charged material of particulate type into the moulding flask, and laying another shield film over the moulding flask, the charged material and the top portion of the sprue forming pattern or the communication-hole forming pattern; welding the two films together along the periphery of the top surface of the sprue forming pattern or the communication-hole forming pattern; cutting the two films, thus welded, along the periphery of the top surface of the sprue forming pattern or communication-hole forming pattern; and removing the sprue forming pattern or the communication-hole forming pattern through the cut portion of the film. In addition, there is disclosed an apparatus for welding the two films together and cutting the same along the periphery of the top surface of the sprue forming pattern or the communication-hole forming pattern.
REFERENCES:
patent: 3825058 (1974-07-01), Miura et al.
patent: 3861447 (1975-01-01), Hondo
patent: 4009747 (1977-03-01), Miura et al.
Terada Hideto
Yosikawa Masanori
Baldwin Robert D.
Sintokogio Ltd.
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