Experiment on milling stability of thin walled partsbased on process variable mode
                                      TIAN Wei jun1, REN Jun xue1, LI Yu2, WANG Da zhen1, ZHANG Bao gang1
(1.The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Ministry of Education,Northwestern Polytechnical University, Xi an 710072, China; 2.Ming de College,Northwestern Polytechnical University, Xi an 710124, China)

Abstract: Aiming at the problem of vibration in NC milling of complex aeronautical thin walled structure parts, the influence of changing modal parameters on machining stability of thin walled parts during milling was experimentally studied, and the dynamic model of thin walled part milling process system was deduced and established milling of thin wall partts amplitude response function and structure parameters of process system, the impact of changes in the milling process modal stiffness and modal mass on modal frequencies was revealed by the evolution process of analysis of modal parameters under the condition of different process of modal experiment, and based on the variation of modal frequency, the primary spindle speed range was selected，the value range of spindle speed was further optimized through the state amplitude response curve of thin walled parts, and a feasible cutting plan for thin walled parts with constant speed cutting and variable speed was put forward, and engineering verification was made by using thin walled blades. The results indicate that the optimal spindle parameter selection strategy based on modal parameters combined with the amplitude response curve of thin walled parts is feasible, which can provide a basis for reasonable selection of parameters for thin walled parts milling.

Key words: thin walled parts; vibration; mode; cutting parameter