Optimization of Milling Parameters for 6SPS-Type Parallel Machine Tool
Aiming at the instability of milling process caused by stiffness and vibration response of parallel machine tool in different postures,a variable feed rate optimization method was proposed based on the analysis of cutting parameters with 6SPS-type parallel ma-chine tool as the research object.The total elongation and standard deviation of each pusher were used to describe the posture,the feed speed was converted into feed rate,and the mathematical model of feed multiplier on the total elongation and standard deviation of the pusher was established.Different milling paths,parameters,and cutting tools were used to carry out milling experiments with constant and variable feed speeds,respectively.The experimental results show that the variation range of the root mean square of vibration of con-stant feed milling is 179 times and 8.5 times larger than that of variable feed milling in experimental scheme 1 and 2,respectively;the difference in surface quality of constant feed milling is obvious in experimental scheme 1,while the surface quality of variable feed mill-ing is more stable.The proposed variable feed rate optimization method effectively improves the milling stability of the parallel machine tool.
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