聚合物粉体动摩擦因数的影响实验研究

Experimental Research of Effects of the Kinetic Friction Coefficient for Polymer Powders

设计了一套自动化实验数据采集程序,实现了对于压力、扭矩和温度的多参数、在线数据采集,并基于LabVIEW数学函数功能计算出粉体物料动摩擦因数。研究了在不同压力、温度、转速和材料种类时,其动摩擦因数的变化情况,并分析不同压力、温度、转速和材料种类等因素对动摩擦因数的影响。结果表明,动摩擦因数随着压力的增大而降低,且压力、温度和转速这些因素是相互影响的;不同粉体材料的性质对动摩擦因数有着很大影响,其中聚四氟乙烯粉体动摩擦因数最低,并且橡胶粉体动摩擦因数随着颗粒的增大而增大;动摩擦因数测试结果证明所设计的测试系统是切实可行的,而且数值的准确度和精度都比较高。

A procedure for automatic acquisition of experimental data was designed. On-line data-acquisition （DAQ） system and calculation of the kinetic friction coefficient based on maths function of the LabVIEW were obtained for pressure, torque, and temperature. Variation of the kinetic friction coefficient at different pressure, temperature, rotating speed and the material fineness was compared and analyzed. The experimental result showed that the kinetic friction coefficient decreased with increasing pressure. Properties of different powder had a great effect on the kinetic friction coefficient. The kinetic friction coefficient of the PTFE was the minimum, and the kinetic friction coefficient of rubber powders increased with increasing particle size.