Evaporable foam pattern for use in casting a crankshaft

Details Evaporable foam pattern for use in casting a crankshaft Evaporable foam pattern for use in casting a crankshaft

1989-11-16

1991-08-13

Seidel, Richard K.

Metal founding

Process

Shaping liquid metal against a forming surface

164 34, 164246, 164249, B22C 904, B22D 1902

Patent

active

050388479

ABSTRACT:
A pattern for use in casting a rotatable shaft, such as a crankshaft for an internal combustion engine. The pattern includes an evaporable foam pattern section composed of a material such as polystyrene and having a configuration conforming to the crankshaft to be cast. The evaporable foam pattern section includes a plurality of cranks connected by bearing areas, and tubular metal inserts formed of bearing quality steel are disposed around each bearing area and around the pin areas of the cranks. In the casting process, the pattern is placed in a mold and surrounded with a finely divided material such as sand. When molten ferrous metal is fed into contact with the pattern, the pattern will vaporize with the vapor passing into the interstices of the sand while the molten ferrous metal will occupy the void created by the vaporized foam to produce a cast crankshaft having bearing quality steel inserts at the bearing and pin areas.

REFERENCES:
patent: 4691754 (1987-09-01), Trumbauer et al.
patent: 4705092 (1987-11-01), Ito et al.

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