Influence to performance of keyway broaching hydraulicsystem caused by dynamic broaching force
                                             YING Yanxin1, ZHENG Shirong2, LIN Lvsheng1, LIN Xiang1
(1.Zhejiang CHR Intelligent Equipment Co., Ltd., Jinyun 321404, China;2.Shanghai Automotive Brake Systems Co.,Ltd.,Shanghai 201821,China)

Abstract: Facing the complicated influence of dynamic broaching force on the output performance of hydraulic system, a keyway broaching system was researched. Firstly, based on the nonlinear broaching load model and the dynamics of main cylinder in broaching, coupled dynamics of broaching process was provided. Then, the output waveforms of hydraulic system on broaching under nonlinear disturbance were analyzed by the numerical simulations and experiments. The results indicated that the nonlinear characteristic of dynamic broaching force is mainly caused by the variation cutting tooth numbers. And the nonlinear dynamics of the hydraulic system come from the volume variation rate of main hydraulic cylinder and rod motion infected by the dynamic broaching force. Therefore, it is necessary for suppressing the vibration of hydraulic system caused by dynamic broaching force in broaching machine design to increase the relative stiffness of the hydraulic system.

Key words: keyway broaching; broaching force; output characteristics; spectrum map