高速数控机床的工作性能首先取决于高速主轴的性能。设计了一种基于电力测功加载系统和压电陶瓷加载系统的高速电主轴可靠性试验台,它能够完成转速为18000r/min以上的电主轴可靠性试验;实现高速电主轴的性能指标测试,如电主轴温升控制,主轴的径向跳动和轴向窜动等的测试;采用电力测功加载系统及压电陶瓷加载系统模拟主轴受力状况(包括径向力、轴向力与扭矩),实现电主轴的动态加载实验与测试;检测试验过程中的各种故障,记录试验过程中试验信息,并可进行查询,通过采集的参数数据进行可靠性分析,为提高电主轴的可靠性提供了定量数值评估平台。

The performance of the high-speed motorized spindle strongly affects the performance of the high-speed CNC machine tool. To improve the MTBF level of a high-speed CNC machine tool, it is of great importance simulating the real working condition of the motorized spindle and developing a reliability test platform. In this paper, a reliability test platform for high-speed motorized spindles is designed based on power dynamometer and piezoelectric loading systems. The reliability test of the motorized spindle can be carried out with a rotation speed over 18000r/min; the performance indices of the high-speed motorized spindle can be determined, such as the performance of the temperature rising control, the radial runout and the axial play of the motorized spindle; with the power dynamometer and piezoelectric loading systems, the loading condition of the spindle can be simulated, including the radial force, the axial force and the torque, and the dynamical loading test of the motorized spindle can be carried out; the failures during the test can be detected; the information of the test can be recorded, and the reliability analysis can be made according to the data collected from the test, providing a quantitative evaluation platform for improving the reliability of the motorized spindle.