The creeping phenomenon of sliding guideways at low speed and heavy load seriously affected the machining accuracy of the machine tools.In order to improve the creeping phenomenon of the sliding guideways,the design of composite lubrication structure on the surfaces of sliding guide-ways and the characterization of friction force in stages were studied.The composite lubricating micro-texture was prepared by high temperature and high-pressure mosaic method based on the laser abla-tion micro-texture.The characterization methods of friction force in stages were proposed by friction tests.The influences of different composite lubricating structures on the friction characteristic parame-ters of each stage were explored.The theoretical models of the composite lubricating structures to im-prove the creeping phenomenon were established,and the composite lubricating structures with the best performance to suppress the creeping phenomenon were found.The results show that the surface micro-texture only affects the severe stick-slip and climb stages of friction force,while the composite lubrication texture has a significant effect on the entire start-up stage.The multi-stage composite lu-brication texture(SF-3)with the combination of sinusoidal grooves and hexagonal pits filled with mo-lybdenum disulfide(MoS2)was the most effective in improving the surface contact conditions and suppressing the creep phenomenon.Compared to the smooth surface(SS)sample,the creep time of the SF-3 sample is reduced by 72％,the instability force in the first stage is reduced by 69.83％,and the friction jump force in the second and third stages is reduced by 75.91％and 80.17％,respectively.
关键词
滑动导轨/爬行现象/复合润滑结构/摩擦力
Key words
sliding guideway/creeping phenomenon/composite lubrication texture/friction force
维普
万方数据