钴铬钼合金磁流变抛光工艺研究  

Magnetorheological Finishing Process of CoCrMo Alloy

作　　者：孙宝玉[1] 于丙金 谭鸿强 袁德禄 谷岩[1] SUN Bao-yu;YU Bing-jin;TAN Hong-qiang;YUAN De-lu;GU Yan(School of Mechanical Engineering,Changchun University of Technology,Changchun 130012,China)

机构地区：[1]长春工业大学机电工程学院,长春130012

出　　处：《表面技术》2022年第10期310-320,共11页Surface Technology

基　　金：吉林省自然科学基金(20190201254JC)。

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1000 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、2.5μm粒径的金刚石磨料,使用2μm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2μm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。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 th

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 

分 类 号：TG356.28[金属学及工艺—金属压力加工]