小口径永磁球头磁流变抛光工艺研究（英文）
发布时间：2019-07-24 20:55
【摘要】：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.
[Abstract]:In order to solve the problem that the minimum curvature radius of 2 mm of hemispheric harmonic oscillator is difficult to be polished by traditional wheeled magnetorheological polishing, a permanent magnet ball head magnetorheological polishing technique with diameter of 4 mm is proposed, and its removal function and process parameters are studied. Based on the hydrodynamic analysis method of sliding bearing lubrication, a three-dimensional removal model of magnetorheological polishing zone of small caliber permanent magnet ball head is established. The numerical methods such as two-dimensional finite difference method and relaxation iterative method are used to solve the model. The results show that the morphology of the polished region is very similar to the shear force velocity product diagram, but completely different from the pressure velocity product distribution. It is proved that the surface material removal of the workpiece is dominated by shear force removal, not by positive pressure removal, and the removal function is established by using shear force and polishing relative velocity. The K average value of the middle region of Preston equation is 8.93 脳 10 ~ (- 13) m ~ 2 鈮，
本文编号：2518860
[Abstract]:In order to solve the problem that the minimum curvature radius of 2 mm of hemispheric harmonic oscillator is difficult to be polished by traditional wheeled magnetorheological polishing, a permanent magnet ball head magnetorheological polishing technique with diameter of 4 mm is proposed, and its removal function and process parameters are studied. Based on the hydrodynamic analysis method of sliding bearing lubrication, a three-dimensional removal model of magnetorheological polishing zone of small caliber permanent magnet ball head is established. The numerical methods such as two-dimensional finite difference method and relaxation iterative method are used to solve the model. The results show that the morphology of the polished region is very similar to the shear force velocity product diagram, but completely different from the pressure velocity product distribution. It is proved that the surface material removal of the workpiece is dominated by shear force removal, not by positive pressure removal, and the removal function is established by using shear force and polishing relative velocity. The K average value of the middle region of Preston equation is 8.93 脳 10 ~ (- 13) m ~ 2 鈮，
本文编号：2518860
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