基于全生命周期的螺杆转子刀具设计研究

摘要

In the rough milling process,the allowance differences of screw rotor blades at differ-ent positions were huge.There were the problems of uneven blade wears,and the machining precision and efficiency of the rotors were dropped.As a result,an algorithm of blade life-cycle was introduced to the cutting tool designs and a new design method was proposed.The numbers of serious worn blades were increased to make the blade life-cycle stay the same.Finally,the arc profile of screw ro-tors was put as research obj ect.The cutting tools of screw rotors were designed and manufactured. The processing experiments of rotor were established through the cooperation with Wuxi compressor Co.Ltd.The machined surface roughness of multi-blade rough milling cutter of screw rotors is as Ra=12.5μm,which coincides with roughing machining standard of screw rotors.The interval of cut-ter blade replacement is extended twice.The experiments show that this design method has a better rationality.%由于螺杆转子粗铣过程中,不同部位刀片加工余量差别巨大,存在刀片磨损不均匀的难题,降低了转子的加工精度与效率.为此,依据刀片全生命周期算法,提出增加磨损严重部位铣刀盘的刀片数量,使刀片的生命周期尽量一致的铣刀设计方法,以减少刀片更换次数、提高转子加工精度.与无锡压缩机厂合作,以圆弧转子型线为研究对象,设计了双螺杆压缩机转子刀具.其加工实验结果表明：多刀片螺杆转子粗铣刀粗糙度Ra＝12．5μm,符合螺杆转子加工精度要求,铣刀刀片更换时间间隔延长了一倍,证明了该刀具设计方法的合理性.