Metal founding – Process – Shaping a forming surface
Patent
1989-12-04
1991-03-19
Seidel, Richard K.
Metal founding
Process
Shaping a forming surface
164 91, 164 95, 164 96, B22C 904, B22D 1916
Patent
active
050002449
ABSTRACT:
In a preferred embodiment, a compound aluminium alloy engine block casting comprises at least a piston-travel region of a cylinder wall section formed of a first alloy, preferably hypereutectic aluminum-silicon alloy, and a remainder including a crankcase section and a water jacket wall formed of a distinct second alloy, preferably hypoeutectic aluminum-silicon alloy. The engine block casting is made by a lost foam process that employs an expendable pattern formed of expanded polystyrene or the like. The pattern comprises a first runner system for casting the first alloy to decompose and replace a portion of the pattern corresponding to the piston-travel region of the casting, and a second runner system for casting the second alloy to decompose and replace the remainder of the pattern. The first alloy and the second alloy are independently but concurrently cast into a singular mold, such that the entire pattern is duplicated, whereupon the alloys merge and fuse to form an integral casting. The preferred product engine block casting advantageously combines the high wear resistance of the hypereutectic aluminum alloy in the cylinder wall section and the reduced porosity and improved machinability of the hypoeutectic alloy throughout the balance of the casting.
REFERENCES:
patent: 3861454 (1975-01-01), Mezey
patent: 4197899 (1980-04-01), Ernest
patent: 4243093 (1981-01-01), Nieman
Batten, Jr. J. Reed
Fekete Douglas D.
General Motors Corporation
Seidel Richard K.
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