Abstract
As the basis on grinding ceramic bobbins used for high frequency coils, the influence of a height distribution in cutting edges on grinding force and surface roughness is investigated when grinding ceramics, such as alumina, forsterite and steatite ceramics, by No.320 diamond wheels in which the conditions of cutting edges were prepared by grinding alumina. The results obtained are as follows : (1) Grinding force changes from 1 to 13kg depending upon dullness of edges and their number. (2) The horizontal grinding force consists of a force fracturing work material and a frictional force between work and wheel. Both the forces is nearly the same in magnitude. (3) Surface roughness is largely governed by the height distribution of cutting edges and by fractured depths which is inherent to work material. Initial roughness of 6μ is reduced to 2μ with the progress of wheel wear. (4) A No.600 wheel, having fine and numerous cutting edges with a comparatively uniform height distribution in cutting edges introduces better finish of less than 1μ in roughness and smaller fracture of work material. It is, therefore, applicable for thread grinding to use this diamond wheel.
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