球面滚子剪切增稠抛光优化实验  

Optimization Experiment for Shear Thickening Polishing of Spherical Roller

作　　者：傅琳 邵蓝樱 杨居儒 吕冰海[1] 邓乾发 王旭 FU Lin;SHAO Lan-ying;YANG Ju-ru;LYU Bing-hai;DENG Qian-fa;WANG Xu(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江工业大学机械工程学院,杭州310014

出　　处：《表面技术》2023年第1期232-241,265,共11页Surface Technology

基　　金：国家自然科学基金(52175441)。

摘　　要：目的研究球面滚子在剪切增稠抛光过程中,不同抛光参数对表面粗糙度的影响,获得滚子光滑滚动面,并优化抛光工艺参数。方法基于田口实验设计,以表面粗糙度Sa为评价指标,分析磨粒种类、磨粒浓度、抛光转速、抛光间距等4个抛光工艺参数对球面滚子剪切增稠抛光后表面粗糙度的影响。通过实验分析表面粗糙度Sa的信噪比结果,得出最优的参数组合,并通过摩擦磨损实验评价抛光表面的摩擦磨损性能。结果得到了优化的工艺参数,Al_(2)O_(3)与SiO_(2)混合磨粒的质量比为1∶1,磨粒的质量分数为10%,抛光转速为70 r/min,抛光间距为4 mm,抛光时间为30 min。在此优化的工艺参数下,球面滚子表面粗糙度Sa从(40±10)nm降至(8.51±2)nm。结论剪切增稠抛光可以有效地去除球面滚子的表面缺陷,且在抛光过程不会改变滚子的圆度,抛光后滚子表面的摩擦因数减小,表面不易发生氧化物堆积。采用剪切增稠抛光可以有效提高GCr15球面滚子的表面质量。The work aims to study the effects of polishing parameters on the surface roughness in the shear thickening polishing(STP)process of spherical roller to obtain smooth surface of spherical roller and optimize the polishing parameters.The effects of four process parameters on the surface roughness of spherical were analyzed,including the types of abrasive,the abrasive concentration,the polishing speed and the polishing distance.Taguchi method was used in the experiment,and the surface roughness was used as evaluating indicator to analyze the influence of the four parameters.The signal-to-noise ratio(S/N)of experimental results was calculated to obtain an optimized combination of process parameters.The frictional wear properties of the polished surface were tested by friction and wear experiments.With the increase of the polishing speed,the polish efficiency increased firstly and then decreased,because the high centrifugal force caused by the high polishing speed resulted in a reduction of abrasive particles in the processing area.An increase in the concentration of abrasive can increase the number of abrasive particles involved in processing,but the concentration of abrasive particles also affected the rheological properties of the polishing slurry,the thickening effect of polishing slurry decreased with the increase of abrasive particle concentration,and the polishing effect was the best when the abrasive particle concentration was 10%.Polishing slurry with mixed abrasive of 1∶1 SiO_(2)/Al_(2)O_(3)can be more effective in removing workpiece surface defects compared with single Al_(2)O_(3)or SiO_(2)abrasive.On the one hand,nano-SiO_(2)enhanced the oxidation rate of the workpiece surface material in the acid polishing solution,and reduced the strength of the workpiece surface material.On the other hand,Al_(2)O_(3)abrasive grains and SiO_(2)abrasive grains further improved the mechanical removal rate of abrasive grains.The polishing distance affected the shear force of the polishing slurry in the processing area.Wh

关 键 词：球面滚子 剪切增稠抛光 表面粗糙度 摩擦因数 

分 类 号：TG356.28[金属学及工艺—金属压力加工]