Rotor for a rotary screw machine having internal member and external shell made of pressed metal powder
AssigneeSvenska Rotor Maskiner AB
InventorKarlis Timuska
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Abstract
A rotor for a rotary screw machine has helical lobes (12) and grooves (14). A shell structure (18) forming the external surface of the rotor is made of pressed metal power. The rotor is manufactured by cold isostatic pressing of a powder in a vessel having a surface shaping rotor. The pressure is applied radially by means of a cast bag in which high pressure liquids acts. After the pressing process, the rotor blank is sintered and attached to a shaft (16).
Claims16
A rotor for a rotary screw machine, the rotor having an external peripheral surface having helical lobes 912) and intermediate grooves (14) thereon, the rotor further comprising:
- an internal member;
- and
- an external shell (18) connected to and surrounding said internal member, said external shell being made of pressed metal powder of substantially uniform thickness and forming said external peripheral surface of said rotor.
Dependencies are inferred from the claim text.