Verfahren und Vorrichtung zur Herstellung eines Hauptrotors

摘要

A method and apparatus for making a globoid screw for use as a mainrotor in a compressor or expander wherein a cylindrical rotor body is mounted for rotation about the longitudinal axis thereof, a cutter having a pluality of teeth at spaced locations around a circumference disposed in a plane and having an axis of rotation disposed perpendicular to that plane is mounted for rotation about its axis and is disposed so that the plane thereof is parallel to the rotor body longitudinal axis and so that the cutter rotational axis is perpendicular to the rotor longitudinal axis, and the rotor body and the cutter are rotated at synchronized speeds. The rotor body and cutter are positioned relative to each other in a manner moving the cutter axis of rotation and the rotor body longitudinal axis relative to each other to decrease the distance between the axes during rotation of the cutter and rotor body so that the cutter teeth contact the rotor body during each cutter rotation to remove material from the rotor body by a milling action to form a globoid screw profile including a groove having a pair of spaced-apart sidewalls and extending along the rotor body in a helical path. The relative speed between the rotor body and the cutter is changed by a given amount for a given time to effect a positional change between the cutter teeth and the material of the rotor body thereby resulting in a desired change in the globoid screw profile.