The Key Technoiogf of Single Screw Manufacturing by 5-Axis CNC Machining Center

摘要

Though the concept of single screw compressor has heen developed for over 40 years, the manufacturing processes of single screw are still expensive and laborious, because most manufacturers are still using special machine tools to machine it. This situation badly limits the development of new types and new models of single screw compressor, especially those large size models. Manufacturing single screw by 5-axis Computer Numerically Controlled (CNC) machining centers is an attractive idea, which can dramatically improve the manufacture ability. To realize this idea, an approach called "linear roots of flutes single screw" was firstly proposed and published by industry researcher in the United States. A Chinese authoritative "Compressor Manual" also introduced it and recommended it. However, according to our analysis of this design, while considering the practical situation of cutting tools and machine tools, we reach a conclusion that the way of "linear roots of flutes single screw" is incorrect in practice. This paper put forward a practically proven approach for manufacturing single screw by 5-axis CNC machine center. The process of this approach is presented. CP-type single screws manufactured by this technology have been installed in 10 m~3 single screw compressors, and good run-in results have been achieved.