Cast formed bi-metallic worm assembly and method

Details Cast formed bi-metallic worm assembly and method Cast formed bi-metallic worm assembly and method

1991-10-30

1993-02-23

Seidel, Richard K.

Presses

Concurrent pressing and conveying

Helix-type compressor

164111, B30B 300, B22D 1916

Patent

active

051880237

ABSTRACT:
A cast-formed bi-metallic worm assembly of a mechanical screw press for expressing liquids from fibrous materials and a method of manufacture therefor and the product produced by the method. The worm assembly is rotatably driven by the press drive shaft and includes an outer flight body having an integral outwardly extending helical flight formed of a relatively brittle, wear-resistant homogeneous cast material and an inner hub tightly fitted and substantially fully mated within, and coextensive with, the outer flight body. The inner hub, cast formed of a more ductile, tougher homogeneous material, includes a hollow cylindrical interior surface structured for slidable engagement around and in driving connection with the drive shaft. The inner hub and outer flight body are securely engaged one to another by cast forming the outer flight body around the precast inner hub. Longitudinal lobes in a smooth undulating in and out clover leaf cross sectional pattern further increase rotational or torsional strength of the worm assembly without appreciably increasing internal operating stress between inner hub and outer flight body.

REFERENCES:
patent: 929687 (1909-08-01), Monnot
patent: 3307423 (1967-03-01), Dansi
patent: 3659323 (1972-05-01), Hachisu et al.
patent: 3863701 (1975-02-01), Niimi et al.
patent: 4023613 (1977-05-01), Uebayasi et al.
patent: 4693293 (1987-09-01), Yamamoto et al.
patent: 4996919 (1991-03-01), Mansfield

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