Rotor for a rotary screw machine having internal member and external shell made of pressed metal powder
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United States of America Patent
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-
May 10, 1994
Grant Date -
N/A
app pub date -
Oct 13, 1992
filing date -
Apr 27, 1990
priority date (Note) -
Expired
status (Latency Note)
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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).
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