Study on Free Form Surface Finishing by Magnetic Abrasive Machining Process

研制了一种用双步进电机控制X、Y轴二维运动的平面精加工装置。通过实验阐明了各种材料的平面整理特性，并对整理机理进行了探讨。本研究得到的结果如下：1。通过实验，分别明确了电磁线圈的安装位置和精加工装置结构部件磁路的设计原则。2. 实验考察了磁通量密度、旋转磁极圆周速度、工作间隙、工件进给量、磁性磨料类型、工件厚度、磁极道次和工件材料等各种工作因素对精加工特性的影响。3. 结果表明，采用磁磨料加工工艺可在较短的精加工时间内获得0.1mumRmax的表面粗糙度值。4. 在不锈钢板的精加工实验中获得了2mum/*100mm的平整度。5. 对电解-磨料复合精加工工艺进行了研究，证实了利用电解作用可实现高效精加工。6. 分别采用电镀工艺和非电镀工艺制备了新型金刚石磁性磨料，并对其表面处理性能进行了测试。其次，进行了自由曲面精加工实验。实验结果如下：研制了一种带有示踪控制系统的台式曲面精加工装置，并对其精加工性能进行了测试。8. 通过对凹凸曲面的精加工实验，证实了该方法在自由曲面精加工中的应用。

A plane surface finishing apparatus was newly made in which the two dimensional motions of X and Y axes are controlled using two stepping motors. The plane finishing characteristics of various materials were clarified experimentally and the finishing mechanism was discussed. The results obtained in this study are as follows: 1. The suitable position installed of an electromagnetic coil and the design rules in magnetic circuit of construction component parts of finishing apparatus are made clear respectively by experiments. 2. The effects of various working factors, in special, magnetic flux density, circumferential speed of rotatory magnetic pole, working clearance, feed of workpiece, type of magnetic abrasive, thickness of workpiece, pass number of magnetic pole and material of workpiece, on finishing characteristics are examined experimentally. 3. It is confirmed that the value of 0.1mumRmax in surface roughness is obtained easily in a short finishing time by magnetic abrasive machining process. 4. The flatness of 2mum/*100mm is obtained in the finishing experiments of stainless steel plate. 5. The electrolytic-abrasive compound finishing process is investigated, and it is confirmed that the efficient finishing is realized by electrolytic action. 6. New various diamond magnetic abrasives are made by electroplating process and non-electro plating process respectively, and its finishing performances are examined.Next, the experiments concerning the free form surface finishing were performed. The results obtained are as follows: 7. A bench type finishing apparatus with tracer control system is newly made to finish free form surface and its finishing performance is examined. 8. The possibility of the application to free form surface finishing is confirmed by the finishing experiments using convex and concave surfaces.