Method of making a crankshaft

Details Method of making a crankshaft Method of making a crankshaft

1988-07-22

1989-05-16

Goldberg, Howard N.

Metal working

Expanded metal making

By use of reciprocating perforator

291564R, 295276, 164 98, 164100, B21K 108

Patent

active

048296422

ABSTRACT:
A method of making a crankshaft involves positioning a serpentine-shaped tube in a casting mold with a plurality of removable (breakaway) portions of the tube spaced apart along the length thereof supported in the mold body and a plurality of oil line-forming portions of the tube between the removable portions bridging across a crankshaft-shaped mold cavity formed in the mold. Molten metal is cast into the mold cavity about the oil line-forming portions of the tube to form a cast crankshaft with the oil line-forming portions of the tube cast in-situ therein and the removable portions of the tube disposed externally of the cast crankshaft. After separating the cast crankshaft and the mold, the removable portions of the tube are severed from the cast crankshaft, preferably broken off from the cast crankshaft at scored locations on the serpentine-shaped tube, to leave a plurality of open-ended, tubular oil lines cast in-situ in the crankshaft.

REFERENCES:
patent: 1630138 (1927-05-01), Schutz
patent: 2917946 (1959-12-01), Fritz
patent: 3064112 (1962-11-01), Hanzel
patent: 3853309 (1974-12-01), Widmer
patent: 3965962 (1976-06-01), Tanaka et al.
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patent: 4620507 (1986-11-01), Saito et al.
patent: 4749624 (1988-06-01), Pete et al.
"Bending Fatigue Strength of Nodular Graphite Cast Iron Crankshafts", Wright & Willis, Mar. 1962.

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