Development of High-Efficiency Finishing Machine by Magnetic Float Polishing

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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.