Cmm-based Profile Measuring Method for Unknown Screw Compressor Rotor

摘要

The measurement for unknown screw compressor rotor profile is a nodus in CMM measurement because of the complexity of 3D helical surface, whose surface normal vector is uncertainty. For this reason, conventional 2D measurement methods exist theoretical error. This paper provides a quadratic measuring method. The second-measurement is an accurate 3D measurement with the normal vectors of measured points, which can be figured out based on the 3D modeling of the first-measurement. In this paper, some key technologies such as screw pitch solution, 3D path planning on CMM and normalization of measured rotor profile data are resolved legitimately.