Mechanism Analysis and Process Optimization on Hard Polishing and Soft Polishing of Hard and Brittle Materials：An Example of 99% Al2O3

• Main Authors: Chia-Hsien Liu, 劉嘉顯
• Other Authors: Jerry Chih-Tsong Su
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/32450881778950691167

碩士 === 國立高雄第一科技大學 === 機械與自動化工程所 === 91 === ABSTRACT This article analyzes the difference of hard polishing and soft polishing mechanisms and the variation of surface roughness improvement and the material removal quantity of the continuous polishing process, and this study uses the central composite design (CCD) method for the design of the experiment and the 99% aluminum oxide (Al2O3) sheet for as the work piece, and selects the parameters such as processing pressure, platen speed, solid content, machining time, and pH value to individually set up the polishing experiment and measure the response value. The key point of research is the optimal process parameter design for the hard polishing and soft polishing and the analysis of variance for the polishing mechanism. In the statistical analysis, we obtain the important process parameters, material removal quantity, the empirical formula for the surface roughness improvement value of both hard polishing and soft polishing, and the optimal process parameters for the hard and soft polishing; and in the continuous polishing process, the experiment result on the estimation model of the hard polishing and soft polishing surface roughness improvement, simulated machining time gives the best surface roughness in the shortest machining time under an appropriate combination of machining time. The comparison of the two shows that the hard polishing is suitable for the machining of larger pressure and slower speed, and the soft machining is suitable for smaller pressure and faster speed; the solid content is insignificant to the roughness improvement value; the pH value is insignificant to the soft polishing roughness improvement value; as to the analysis of variance of the polishing mechanism, the impact by the difference of the experiment result and platen surface material, the maintenance of the solid and limit of the abrasive size, the limit of polishing roughness, and the variation of the polishing parameter will be studied to discover that the applicable manufacturing scope of both, the way of contacting and the applicable abrasive size will be different, and thus having different manufacturability, and finally verifying the empirical model and the best polishing parameter.