Method for manufacturing screw rotors
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United States of America Patent
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-
Jun 15, 1993
Issued Date -
N/A
app pub date -
Nov 8, 1991
filing date -
Apr 7, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of manufacturing rotors having helical lands and intermediate grooves wherein a multi-layer rotor body (2) is moulded or otherwise formed on a shaft (1) to only a small degree of accuracy, whereafter an outer layer (3) of polymer-based material is moulded on the rotor body to a high degree of accuracy. For the purpose of eliminating shrinkage-induced distortion of the lands of the rotor body (2) subsequent to applying the outer layer, the rotor body is produced in a multiple of layers (21, 22), by casting or like moulding processes, with each of the body layers having a thickness which is greater than that of the high accuracy outer layer (3).
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