| LI Jun,ZHANG Yu-chi,MING Shun,WANG Huan-tao,ZHU Yong-wei,ZUO Dun-wen.Effect of Fixed Abrasive Ball on Friction and Wear Properties of CaF2 Crystal[J],48(12):196-203 |
| Effect of Fixed Abrasive Ball on Friction and Wear Properties of CaF2 Crystal |
| Received:June 04, 2019 Revised:December 20, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.12.023 |
| KeyWord:CaF2 crystal friction and wear fixed abrasive ball matrix hardness friction coefficient |
| Author | Institution |
| LI Jun |
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| ZHANG Yu-chi |
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| MING Shun |
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| WANG Huan-tao |
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| ZHU Yong-wei |
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| ZUO Dun-wen |
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| Abstract: |
| The paper aims to study the friction and wear properties of CaF2 crystals by changing the matrix and abrasive properties of the fixed abrasive balls and provide guidance for selection of a fixed abrasive pad for lapping and polishing of calcium fluoride (CaF2) crystals in ultra-precision machining. Based on fixed abrasive machining technique, fixed abrasive ball was prepared and ground against CaF2 crystal. The effect of abrasive types (diamond and cerium oxide abrasives), matrix hardness and abrasive grain size on friction coefficient of the grinding, the cross-sectional area and the roughness of the scratch were investigated. The results showed that, the scratch area S of the diamond abrasive on the milled surface was 480 μm2, the scratch roughness Ra was 85.3 nm, the average friction coefficient μ was 0.537, and those of the cerium oxide grain were S=307 μm2, Ra= 74.7 nm, μ=0.543, respectively. Compared with cerium oxide, the diamond abrasives had larger scratches section and roughness on the crystal surface, and friction coefficient reached a stable state in a short time, and the average value of friction coefficient was smaller. With the increase of matrix hardness, the section area of the scratches gradually increased. When the matrix hardness was moderate (the matrix of type Ⅲ), the section area of the scratches tended to be stable at 450 μm2, and the scratch roughness Ra was 85.8 nm, which was also the smallest. The symmetry of the scratch profile at the matrix III and IV was good. The time of friction coefficient to reach stability decreased with the increase of matrix hardness, and the turbulence range was smaller, but the average value of friction coefficient was larger. With the increase of particle size, the roughness value of the scratch area and the scratch area both increased, and the longer the time of friction coefficient to reach the stable state, the larger the average value of friction coefficient was. When processing CaF2 crystals with a fixed abrasive pad, the diamond abrasive and matrix III should be selected, and the size of the abrasive particle should be considered depending on the demand of material removal rate and surface quality. |
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