Abstract
Need for the controllable finishing of materials such as semiconductors and ceramics, has remarkably increased in the fields of electronics and precision machinary. A new lapping method has been developed by utilizing functional magnetic fluid which has the ability to move in the magnetic field. The magnetic fluid is a suspension of fine magnetite Fe3O4(smaller than 150A) in liquid. This lapping method is based on the floatation of nonmagnetic grains suspended into the magnetic fluid in the magnetic field. Lapping experiments were conducted on soda lime glass. It was found from the experiments that the new lapping method is able to control the stock removal rate through varying the current to the electromagnet. The present method may be usefully employed in finishing such parts as aspherical lenses.
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