论文部分内容阅读
针对半球谐振子最小曲率半径2 mm难以被传统轮式磁流变抛光的难题,提出一种直径4 mm的永磁球头磁流变抛光技术,研究了其去除函数和工艺参数.结合滑动轴承润滑流体动力学分析方法,建立小口径永磁球头磁流变抛光区的三维去除模型.采用二维有限差分、松弛迭代法等数值方法对模型进行求解,结果为抛光区形貌与剪切力速度乘积图极其相似,而与压力速度乘积分布完全不同,证明了工件表面材料去除是以剪切力去除为主,而不是以正压力去除为主,并且采用剪切力与抛光相对速度建立去除函数.通过计算可以得到Preston方程中中间区域的K平均值为8.93×10-13m2/N.单因素实验结果表明当最小加工间隙越小,主轴转速越大时,材料去除率越大.本文为不同情况下选择最优工艺参数提供了理论基础.
Aiming at the difficulty that the minimum radius of curvature of the hemispherical resonator is 2 mm, which is hard to be polished by the conventional wheel MRF, a permanent magnet ball head MRF with a diameter of 4 mm is proposed and its removal function and process parameters are studied. Lubrication fluid dynamics analysis method to establish a three-dimensional removal model of small-diameter permanent magnet ball-head MRF.The two-dimensional finite difference, relaxation iteration and other numerical methods to solve the model, the results for the polishing area morphology and shear The plot of force velocity products is very similar, but completely different from the product of pressure velocities. It is proved that the surface material removal is mainly shear force removal, not positive pressure removal, and shear force and polishing relative velocities are established Removal function.The average K value in the middle of the Preston equation can be obtained as 8.93 × 10-13m2 / N. The results of the single factor experiment show that the material removal rate is larger when the minimum machining gap is smaller and the spindle speed is bigger. It provides a theoretical basis for choosing the optimal process parameters in different situations.