Cast formed bi-metallic worm assembly & method

F - Mech Eng,Light,Heat,Weapons – 16 – H

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F16H 21/16 (2006.01) B22D 19/16 (2006.01) B30B 9/12 (2006.01)

Patent

CA 2076221

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 torsionalstrength of the worm assembly without appreciably increasing internal operating stress between inner hub and outer flight body.

Vis bimétallique coulée pour presse à vis destinée à extraire les liquides de matériaux fibreux, méthode de fabrication et produit résultant de l'application de cette méthode. L'arbre d'entraînement de la presse fait tourner la vis dont le filet externe intégré de forme hélicoïdale est constitué d'un matériau homogène coulé, résistant à l'eau et relativement fragile. Le corps de la vis est ajusté et essentiellement entièrement accouplé avec et de la même longueur que le filetage. Le corps coulé de la vis se compose d'un matériau homogène plus ductile et plus résistant que le filetage, et comporte un orifice cylindrique creux destiné à entrer en contact par glissement avec l'arbre d'entraînement, qui lui imprime un mouvement. Pour joindre solidement le corps de la vis et le filetage externe, il suffit de former le filetage par coulage autour du corps prémoulé de la vis. Des lobes longitudinaux ont, en coupe transversale, la forme ondulée et régulière de feuilles de trèfle, ce qui accroît davantage la force de rotation et la résistance à la torsion de la vis sans augmenter sensiblement le taux de contrainte interne entre le corps et le filetage externe.

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