孙宝玉,于丙金,谭鸿强,袁德禄,谷岩.钴铬钼合金磁流变抛光工艺研究[J].表面技术,2022,51(10):310-320.
SUN Bao-yu,YU Bing-jin,TAN Hong-qiang,YUAN De-lu,GU Yan.Magnetorheological Finishing Process of CoCrMo Alloy[J].Surface Technology,2022,51(10):310-320
钴铬钼合金磁流变抛光工艺研究
Magnetorheological Finishing Process of CoCrMo Alloy
  
DOI:10.16490/j.cnki.issn.1001-3660.2022.10.033
中文关键词:  磁流变抛光  钴铬钼合金  磁通密度  抛光参数  表面粗糙度
英文关键词:magnetorheological finishing  CoCrMo alloy  field density  polishing parameters  surface roughness
基金项目:吉林省自然科学基金(20190201254JC)
作者单位
孙宝玉 长春工业大学 机电工程学院 长春 130012 
于丙金 长春工业大学 机电工程学院 长春 130012 
谭鸿强 长春工业大学 机电工程学院 长春 130012 
袁德禄 长春工业大学 机电工程学院 长春 130012 
谷岩 长春工业大学 机电工程学院 长春 130012 
AuthorInstitution
SUN Bao-yu School of Mechanical Engineering, Changchun University of Technology, Changchun 130012, China 
YU Bing-jin School of Mechanical Engineering, Changchun University of Technology, Changchun 130012, China 
TAN Hong-qiang School of Mechanical Engineering, Changchun University of Technology, Changchun 130012, China 
YUAN De-lu School of Mechanical Engineering, Changchun University of Technology, Changchun 130012, China 
GU Yan School of Mechanical Engineering, Changchun University of Technology, Changchun 130012, China 
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中文摘要:
      目的 去除难加工材料钴铬钼合金车削后形成的规则性螺旋刀痕并获得超光滑表面。方法 采用磁流变抛光方法,对车削后的钴铬钼合金表面进行抛光加工。研究了磁体排布方式、加工间隙、抛光装置、转速和磨料粒径等工艺参数对钴铬钼合金表面形貌和表面粗糙度的影响规律,寻找获得超光滑表面的工艺参数组合,并对抛光后的钴铬钼合金表面使用表面轮廓仪进行测量。结果 钴铬钼合金表面形貌受各方面因素的综合影响,双磁体异向排布的磁通密度向工件集中,使得磁性羰基铁颗粒与金刚石磨料在抛光过程中结合力更强,增大了有效工作区域;表面粗糙度随着加工间隙的增加(从1 mm增大到4 mm)先减小后增大,在2 mm时得到优化的加工效果;表面粗糙度随着抛光装置转速的增加(从400 r.min–1增大到1 000 r.min–1)先减小后增大,在600 r.min–1时得到优化的加工效果;相比于0.5、1.5、2.5 µm粒径的金刚石磨料,使用2 µm的金刚石磨料进行抛光时表面粗糙度最小。当使用双磁体异向排布,在工作间隙为2 mm、抛光装置转速为600 r.min–1、金刚石磨料粒径为2 μm的工艺参数组合下对钴铬钼合金采用磁流变抛光加工120 min时,其表面粗糙度从初始的640 nm 降低至5 nm。结论 应用磁流变抛光方法抛光钴铬钼合金可以得到超光滑表面。
英文摘要:
      In order to remove the regular spiral tool marks formed after turning of the difficult-to-machine material CoCrMo alloy to obtain an ultra-smooth surface, a magnetorheological finishing method was used to polish the turned CoCrMo alloy surface. The influence of process parameters such as magnet arrangement method, machining gap, polishing device speed and abrasive particle size on the surface morphology and surface roughness of the CoCrMo alloy was studied, and the optimal combination of process parameters for obtaining super-smooth surfaces was found, and the surface of the polished CoCrMo alloy was measured with a surface profiler. The actual measurement results showed that the surface morphology of the CoCrMo alloy was affected by various factors. The magnetic flux density of the anisotropic arrangement of the dual magnets was concentrated on the workpiece, which makes the magnetic carbonyl iron particles and the abrasive stronger in the polishing process. The effective working area was increased; adjusting the machining gap changed the magnetic field strength of the CoCrMo alloy surface to be machined, and the surface roughness of the CoCrMo alloy decreased first and then increased with the increase of the machining gap. When the gap was 2 mm, the surface roughness of the CoCrMo alloy surface reached the lowest level. The magnetic field strength was low when the machining gap was large, and the magnetic carbonyl iron particle chain had poor confinement ability to diamond abrasives, and the removal ability of the CoCrMo alloy surface was weakened. When the machining gap was reduced, the magnetic field strength of the surface to be machined was high, the bonding ability between the magnetic carbonyl iron particles was enhanced, and the abrasive particles in the polishing cluster were pressed into the surface of the CoCrMo alloy to deepen. At the same time, too low clearance caused the diamond abrasive particles in the polishing cluster to be squeezed out of the working area, which affected the removal effect. The rotational speed of the polishing device directly controlled the relative speed between the CoCrMo alloy and the diamond abrasive, which in turn affected the shear removal capability of magnetorheological polishing. The surface roughness of the CoCrMo alloy showed a trend of first decreasing and then increasing with the increase of the polishing device rotating speed. When the polishing device rotating speed was 600 r.min–1, the surface roughness was the lowest; The medium abrasive particle size had an important influence on the interaction force between the magnetic carbonyl iron particles in the polishing cluster, which in turn affected the processing effect. When the grain size of diamond abrasive was 2 μm, the surface roughness was the smallest. When the dual magnets were arranged in different directions, the CoCrMo alloy was processed by magnetorheological finishing for 120 minutes under the optimal process parameter combination of working gap of 2 mm, polishing device speed of 600 r.min–1, and diamond abrasive grain size of 2 μm. The surface roughness value was reduced from the initial 640 nm to 5 nm, and the super smooth surface of the CoCrMo alloy was actually obtained.
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