メタルボンド・ダイヤモンド砥石の目直し

セラミックの砥粒加エ(第5報)

抄録

In view of the importance in dressing a metal bonded diamond wheel for obtaining high reproducibility in grinding ceramics, grinding force, number and height of cutting edges in grains and redress life being pursued, the following results are obtained : (1) Comparing the method 'GVS' that a GC stick is ground with a diamond wheel and the method 'GF', where cutting edges on diamond grains are produced by scratching using a GC wheel, with the method 'GM', the latter is more effective in producing cutting edges through microfractur-ing, because of the driving of both the wheels in the opposite direction under a similar peripheral speed. (2) Many effective cutting edges are obtained from the condition that the grain size of a dressing wheel is finer than that of a diamond wheel. (3) Height of cutting edges on grains is one-tenth to one-twentieth of a diamond grain diameter, leading to the rare release of grains. (4) Effectively acting graing are 10 to 25% of the whole grains along a wheel width in cm², and their number is greatest in the method 'GM', (5) A coarser dressing wheel is better for redress life, but worse for the number of cutting edges.