关键词: 中凸变椭圆活塞, 等体积切除率, 数控加工模型, 仿真加工, 机床

Abstract: To make the cutting force as constant as possible during the process of machining the middle-convex and varying ellipse piston skirt,a constant volume removal rate machining method was proposed.The middle-convex and varying ellipse piston numerical control machining model was established through analyzing the machining principle,structure and movement relationship of machine tool,and the changes of material removal rate,cutting depth and cutting area were also analyzed while the workpiece had rotated at a constant speed.The constant volume removal rate machining model was established by superposing the variable rotation satisfied the dynamic performance constraints of machine tool spindle,so as to make the material removal rate and cutting force in middle-convex and varying ellipse piston skirt were basically constant.The instantaneous position parameters of each axis of CNC piston lathe were obtained,which were turned into numerical control code through the calculation example on one given piston using the constant volume removal rate numerical control machining method.The functional feasibility of the method was verified by the simulation machining and measurement error analysis.

Key words: middle-convex and varying ellipse piston, constant volume removal rate, numerical control machining model, simulation machining, machine tool