Metal founding – Process – Shaping a forming surface
Patent
1990-10-05
1991-07-02
Lin, Kuang Y.
Metal founding
Process
Shaping a forming surface
164 16, B22C 122
Patent
active
050278908
ABSTRACT:
The invention relates to foundary moulding compositions useful for producing moulds for the manufacture of metal castings wherein the moulds are capable of giving castings with good surface finish without the need for conventional separate blacking applications. A foundary moulding composition of the invention comprises refractory material such as sand, alkali phenol-formaldehyde resole resin solution, carbonifiable material such as styrenated phenol, and an effective amount of an organic ester for hardening the composition. In another embodiment, the invention is a binder composition comprising alkali phenol-formaldehyde resole resin solution and carbonifiable material capable of being hardened by reaction with organic ester. In another embodiment, the invention is a curing additive for a foundry binder comprising carbonifiable material and liquid ester such as gamma-butyrolactone, and the like. In another embodiment, the invention is a method of making a foundry mould wherein a mixture of sand, resin and carbonifiable material is shaped, and then hardened with a gaseous ester such as methyl formate.
REFERENCES:
patent: 4283319 (1981-08-01), Konii et al.
patent: 4468359 (1984-08-01), Lemon et al.
patent: 4474904 (1984-10-01), Lemon et al.
Stanbridge et al., "The Replacement of Seacoal in Iron Foundry Molding Sands"; (AFS Trans.), 82, 169-180 (1974).
Owen et al., "Coaldust Replacement as a Greens a Additive" (British Foundryman), 29-32 (Feb. 1975).
Baker Derek W.
Ireland John
Lemon Peter H. R. B.
Railton Jeffrey D.
Borden (UK) Limited
Lin Kuang Y.
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