电子冲击力锤的研制及在刀具模态测试中的应用

Development of Electronic Impact Hammer and Corresponding Application to Modal Test of Cutting Tool

针对刀具模态测试人工锤击法的不足,在对现有的自动力锤进行综合分析的基础上,研制了一种包括工作台、控制器、触发器、开关电源和执行器等部分的工作台式电子冲击力锤测试装置.该装置利用电磁原理控制牵引式电磁铁的通/断电,使牵引力带动冲击力锤,实现对被测对象的冲击,并通过控制力锤与被测对象表面的接触时间得到理想的力脉冲信号.该装置产生的冲击力具有可重复性和可调节性.文中还以刀柄、铣刀杆、镗刀杆以及面铣刀为测试对象,通过该装置分别测试被测对象的端点频率响应函数,得到相应的频响曲线及模态参数.结果表明,该装置结构简单,操作方便,能够产生重复性好、大小可调的冲击力.

In order to overcome the disadvantages of the manual hammer for the modal test of cutting tool,the existing automatic hammer is comprehensively analyzed,and a test device using an electronic impact hammer is developed. The developed device consists of a workbench,a controller,a trigger,a switching power supply and an actuator, etc.It controls the traction electromagnet on/off based on the electromagnetic theory,thus driving the impact hammer by the traction force and realizing the hammer impact on the test object.Moreover,by controlling the con-tact time between the impact hammer and the test object,an ideal force pulse signal with repeatability and adjust-ability can be obtained.Finally,the frequency response functions of the cutting tool shank,the milling tool holder, the boring tool holder and the face milling cutter are respectively tested by using the developed device,and the fre-quency response curve and the modal parameters are obtained.The results show that the developed device is of sim-ple structure and easy operation,and that it helps to produce repeatable and adjustable impact force.