Mold and method for making variable thickness cast articles
A method for casting molten metal articles of variable thickness in a mold is described, said method comprising the steps of: forming cavity walls within a permanent mold to define a casting cavity; lining portions of the cavity walls with sand to conform with the size and shape of corresponding sections of the article to be cast within the cavity; forming unlined bare portions of the cavity walls to conform with the size and shape of other corresponding sections of the article; varying the thickness of the sand to form thick and thin portions of the sand liner which are reversely correlated to corresponding thin and thick sections of the resultant cast article such that the sand liner is thicker in sections where the cast article is thin and is thinner in sections where the cast article is thicker; casting molten metal into the casting cavity causing the varied thickness sections to cool at different rates with the thinner sections cooling at a relatively slower rate than the thicker sections for producing an approximately equalized cooling time for these sections of the cast article; and characterized by controlling the temperature of the bore portions of the cavity walls during casting for precisely controlling the cooling rates and resultant physical properties of the sections of the cast article in contact with the bare portions.
- Assignee:
- CMI International, Inc., Southfield, MI (United States)
- Patent Number(s):
- A; US 5213149
- Application Number:
- PPN: US 7-776607
- OSTI ID:
- 6403030
- Country of Publication:
- United States
- Language:
- English
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