高速电主轴热误差正交试验设计与分析

Orthogonal experimental design and analysis of thermal error of high speed motorized spindle

为考察多因素耦合作用下对高速电主轴热误差的影响状况,提出一种基于无线通信技术的正交试验设计新方法。设计了由温度传感器PT100、微处理器STM8S和无线收发模块nRF905等组成的温度采集标签,可实现分布测点温度信号的智能无线监测,满足了多因素热误差实验以及数据获取的便捷性;基于正交试验法设计了实验方案,既减少了实验次数,又解决了多因素水平数参次不齐的问题;通过直观、极差、方差数据分析,结果表明:冷却因素对于热误差的影响最大,运行时间次之;主轴运行时的最优方案为冷却水温度18℃~20℃,冷却水流量2.5 L/min,转速20000 r/min,运行时长30 min。

In order to investigate the influence of multi-factor coupling on thermal error of high-speed motorized spindle,a new orthogonal experimental design method based on wireless communication technology was proposed.A temperature acquisition label composed of temperature sensor PT100,microprocessor STM8S and wireless transceiver module nRF905 is designed,which can realize intelligent wireless monitoring of temperature signals at distributed measuring points,satisfying the convenience of multi-factor thermal error experiment and data acquisition.The experimental scheme is designed based on the orthogonal experiment method,which not only reduces the number of experiments,but also solves the problem of uneven number of multi-factors.Direct analysis,range analysis and variance analysis of the data show that cooling factors have the greatest influence on thermal error,followed by running time.The optimal scheme for spindle running is cooling water temperature:18℃~20℃,cooling water flow:2.5 L/min,rotating speed:20000 r/min,running time:30 min.