| 摘要 |
The invention relates to a method of manufacturing rotors of the kind having helical lands and intermediate grooves. A rotor body (2) is moulded or formed in some other way 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 said body layers having a thickness which is greater than that of the outer layer (3). |
