| SUN Jian,CHEN Wei,YAO Jin-mei,LI Song-hua,TIAN Jun-xing.Analysis on Lapping Trajectory of Si3N4 Ceramic Ball and Its Effect Mechanism for Surface Quality[J],52(1):253-265 |
| Analysis on Lapping Trajectory of Si3N4 Ceramic Ball and Its Effect Mechanism for Surface Quality |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.01.026 |
| KeyWord:silicon nitride ceramic ball taper lapping lapping parameters lapping trajectory single-factor experiment surface quality |
| Author | Institution |
| SUN Jian |
School of Mechanical Engineering, Shenyang , China |
| CHEN Wei |
School of Mechanical Engineering, Shenyang , China |
| YAO Jin-mei |
School of Mechanical Engineering, Shenyang , China |
| LI Song-hua |
School of Mechanical Engineering, Shenyang , China;National-Local Joint Engineering Laboratory of NC Machining Equipment and Technology of High-Grade Stone, Shenyang Jianzhu University, Shenyang , China |
| TIAN Jun-xing |
School of Mechanical Engineering, Shenyang , China;National-Local Joint Engineering Laboratory of NC Machining Equipment and Technology of High-Grade Stone, Shenyang Jianzhu University, Shenyang , China |
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| Abstract: |
| As an important factor reflecting the surface shape accuracy of the sphere, the motion trajectory during the lapping process of the sphere has not been introduced and analyzed in the current research. For the above reasons, the lapping trajectory of the ceramic ball is introduced into the process of studying the effect mechanism of the surface quality of the sphere, which can be more accurate. The work aims to analyze the effect of lapping trajectory on the surface quality of the ceramic ball under the same lapping liquid ratio and abrasive type, but the different lapping disc rotation speed, load applied by the lapping device and abrasive particle, and clarify the optimal lapping parameters of silicon nitride ceramic ball processed by taper lapping, so as to improve the surface quality of the ceramic ball. Through the optimal lapping parameters, a silicon ceramic ball with good surface quality and high precision can be fabricated. Firstly, the relative motion model between the taper lapping disc and the silicon nitride ceramic ball was established during the lapping. On the basis of the established model, MATLAB was used to simulate the lapping trajectories of the silicon nitride ceramic ball under different lapping parameters. By analyzing these lapping trajectories, the effect of the lapping parameters on the motion state during the lapping process of the ball was obtained. Then, the taper lapping device was used for single-factor experiment verification, and the three variables involved in the experiment were set as the type of abrasive particles (particle size), the lapping disc rotation speed and the load applied by the lapping device. The experimental results were sampled, the surface roughness of the ball was measured by roughness meter, and the surface morphology of the lapping ceramic ball was detected by scanning electron microscope and ultra-depth three-dimensional microscope. Combined with the simulation analysis and experimental results, the effects of the lapping disc rotation speed, the load applied by the lapping device, and the size of the abrasive particles on the surface quality of the ball after processing were investigated. Combining the variation laws of lapping parameters obtained under different simulated lapping trajectories with the experimental results, the optimal lapping parameters obtained were:when the lapping disc rotation speed was 50 r/min, the applied load was 1.30 N and the abrasive particle type was W7, the surface roughness value of the ceramic ball obtained by processing was 0.009 6 μm, which basically met the quality requirements of G3-grade precision full-ceramic ball in actual production. The surface quality of the ceramic ball is greatly affected by the rotation speed of the lapping disc, the load applied by the lapping device and the size of the abrasive particles. With the decrease of the rotation speed of the lapping disc and the decrease of the load and the size of the abrasive particles, the lapping trajectory of the ceramic ball tends to be sparse, and the surface roughness shows a downward trend. Lapping silicon nitride ceramic ball by abrasive particles with smaller diameter at a lower rotation speed of the lapping disc and a smaller load applied by the lapping device is beneficial to improving the surface quality. The research results have important guiding significance for improving the surface quality of ceramic ball. |
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