【摘要】 针对铣削加工中动态铣削力难于测量的问题,提出了一种通过测量铣刀振动位移来确定动态铣削力的方法。该方法首先通过激光测振仪测量铣削加工时铣刀刀杆的振动位移,然后根据测量系统的静态校准结果由该振动位移确定相应的铣削力。针对高速铣削时的铣削力测量失真问题,通过分析刀具系统的动态特性,确定测量系统的传递函数,并采用零极点配置的方法设计了动态补偿环节对测量系统进行动态补偿,以提高测量系统的带宽。在铣削加工中心上进行了铣削加工实验,将本文方法确定的铣削力与三维力传感器测得的铣削力进行了对比。实验结果表明:本文测量方法能准确测量动态铣削力,测量系统的测量带宽可达1 600 Hz,且测量方法简单可靠,易于工程应用。更多还原

【Abstract】 Aiming at the problem that the dynamic cutting force in milling process is difficult to measure,a method that determines the dynamic milling force through measuring the vibration displacement of milling cutter bar is put forward.This method firstly measures the cutter bar vibration displacement in milling process with a laser doppler vibrometer(LDV),and then determines the corresponding milling force from the vibration displacement according to the static calibration results of the measuring system.Aiming at the distortion problem of the measured milling force in high-speed milling process,the transfer function of the measuring system is determined through analyzing the dynamic characteristics of the cutting tool system; and a dynamic compensation link is designed adopting the zero pole assignment method to compensate the dynamic characteristics of the measuring system in order to improve the measuring bandwidth.The milling experiments were conducted on a milling machining center; and comparison was performed between the milling forces measured with the proposed method and obtained using a three-dimensional force sensor.Experiment results show that the proposed measuring method can measure the dynamic milling force accurately,and the frequency bandwidth can reach 1600 Hz.Besides,the measuring method is simple,reliable and easy to be used in engineering application.更多还原