Development of High-Efficiency Finishing Machine by Magnetic Float Polishing

磁流体是指亚畴铁磁颗粒在各种载液中的胶体分散体。当磁性流体置于磁场梯度中时，其被吸引向较高磁场侧。如果磁性物质浸入磁性流体中，则其相对于低场侧被排出。磁悬浮抛光是利用磁悬浮力进行抛光。在此过程中，旋转的工件被压向悬浮在磁流体上的磨料。在本项目中，开发了高效的磁悬浮抛光机。通过一系列的实验研究，阐明了以下几点：1）为了施加磁场，必须使用磁性磨料或悬浮在磁性液体中的非磁性磨料; 2）磁场梯度对磁悬浮抛光的光整加工能力有影响，化合物的粘度或磨料与磁流体之间的亲和力。3）永磁体希望用于抛光机中，由于永磁体的磁场强度比电磁体强。4）将磁流体上的化合物作为研磨磨料，比磁悬浮抛光具有更好的抛光效果。

Magnetic Fluids are colloidal dispersions of subdomain ferromagnetic particles in various kinds of carrier liquids. When magnetic fluid is placed in magnetic field gradient, it is attracted towards the higher magnetic field side. if a nonmagnetic substance is immersed in magnetic fluid, it is discharged relatively to lower field side. Magnetic Float Polishing makes an application of the magnetic buoyant levitational force. In this process the revolving workpiece is pressed to the nonmagnetic abrasives floating on the magnetic fluid.In this project the development of high-efficiency finishing machine by Magnetic Float Polishing was performed. From the series of investigations, the following points have been clarified.1) Either magnetic abrasives or nonmagnetic abrasives suspending in magnetic fluid must be used in order to apply magnetic field.2) Finishing abilities in Magnetic Float Polishing were affected by the magnetic field gradient, the viscosity of the compound or the affinity between abrasives and magnetic fluid.3) Permanent magnets are desirable to use in the finishing machine, because permanent magnets have stronger magnetic field strength than electric magnets.4) The process which the compound on the magnetic fluid was used as a lapping abrasives has better finishing abilities than Magnetic Float Polishing.