| WEI Ze-fei,LI Lei,SHE Dong-sheng,XU Wen-ji.Effect of Electrochemical Mechanical Machining on Surface Quality and Convexity of Bearing Rollers[J],47(7):119-124 |
| Effect of Electrochemical Mechanical Machining on Surface Quality and Convexity of Bearing Rollers |
| Received:January 31, 2018 Revised:July 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.07.016 |
| KeyWord:electrochemical mechanical machining (ECMM) bearing roller surface roughness maximum height of profile profile convexity orthogonal experiment |
| Author | Institution |
| WEI Ze-fei |
Bohai University, Jinzhou , China |
| LI Lei |
Bohai University, Jinzhou , China |
| SHE Dong-sheng |
Bohai University, Jinzhou , China |
| XU Wen-ji |
Dalian University of Technology, Dalian , China |
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| Abstract: |
| The work aims to improve the surface quality and obtain a certain surface convexity of bearing rollers. The self-built electrochemical mechanical machining (ECMM) platform was used for the surface processing of bearing rollers, the neutral NaNO3 aqueous solution was used as the electrolyte and the orthogonal experiment of L9(34) was designed for the experiment. Then the surface roughness, the maximum height of profile and the profile convexity of the bearing rollers before and after the experiment were measured and analyzed by Talysurf CLI2000 instrument. On the basis, the factors and levels affecting surface roughness and profile convexity were analyzed through the experimental data. After ECMM processing, the surface roughness Ra value of the bearing roller decreased from 0.087 μm to 0.0247 μm, the maximum height Rz value of profile decreased from 0.772 μm to 0.238 μm and the surface profile convexity increased from 0.63 μm to 43.3 μm. The effect of current density on the surface roughness was the most significant indicator. The best level of each factor was: the current density of 5 A/cm2, the mechanical pressure of 0.20 MPa, the speed of workpiece of 0.24 m/s and the abrasive number of 1000#. For profile convexity, the effect of current density was also the most significant indicator. The best level of each factor was: the current density of 5 A/cm2, the speed of workpiece of 0.21 m/s, the abrasive number of 2000# and the mechanical pressure of 0.20 MPa. ECMM is suitable for the bearing roller machining and it can improve the surface quality of bearing rollers and obtain a certain convexity degree in one process. The factor that significantly affects the surface quality and convexity among the machining parameters is the current desity. Other machining parameters should be reasonably chosen when the larger machining current density is selected preferentially. |
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