Method of forming a die casting with coated expendable cores

Details Method of forming a die casting with coated expendable cores Method of forming a die casting with coated expendable cores

1989-06-30

1990-10-09

Seidel, Richard K.

Metal founding

Process

Shaping liquid metal against a forming surface

164113, 164138, 164369, 164527, 427134, 523139, 523148, B22C 122, B22C 300, B22C 910

Patent

active

049614584

ABSTRACT:
A method for producing high pressure die castings with undercut regions comprises forming an expendable coated core of specific composition, placing it in the die in a die casting machine, injecting molten metal into the die to form the casting and separating the casting from the die and the core from the casting. The composition of the expendable coated core comprises a base sand core held together by a resin binder; a first, bottom, hard refractory coating comprising fused silica and a refractory binder containing at least two of the following additives: a suspension agent, a dispersant, a wetting agent, and an anti-skinning agent; and a second, top, soft, or release coating containing a release material selected from the group consisting of anhydrous powdered aluminum, graphite, talc, titanium dioxide and zircon, and a resinous binder containing at least two different compounds selected from the group of additives consisting of a suspension agent, a dispersant, and an anti-settling agent.

REFERENCES:
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patent: 4096293 (1978-06-01), Skubon et al.
patent: 4194915 (1980-03-01), Perkins
patent: 4413666 (1983-11-01), Page
patent: 4529028 (1985-07-01), Dybala et al.
patent: 4766943 (1988-08-01), Page
patent: 4867225 (1989-09-01), Downing

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