| SUN Bao-yu,YU Bing-jin,TAN Hong-qiang,YUAN De-lu,GU Yan.Magnetorheological Finishing Process of CoCrMo Alloy[J],51(10):310-320 |
| Magnetorheological Finishing Process of CoCrMo Alloy |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.10.033 |
| KeyWord:magnetorheological finishing CoCrMo alloy field density polishing parameters surface roughness |
| Author | Institution |
| SUN Bao-yu |
School of Mechanical Engineering, Changchun University of Technology, Changchun , China |
| YU Bing-jin |
School of Mechanical Engineering, Changchun University of Technology, Changchun , China |
| TAN Hong-qiang |
School of Mechanical Engineering, Changchun University of Technology, Changchun , China |
| YUAN De-lu |
School of Mechanical Engineering, Changchun University of Technology, Changchun , China |
| GU Yan |
School of Mechanical Engineering, Changchun University of Technology, Changchun , China |
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| Abstract: |
| 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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