Abstract
In many cases, grinding abilities of grinding wheels depend upon their mechanical properties, Therefore, it is necessary to analyse fracture strength in order to evaluate grinding abilities of grinding wheels, and so in this paper, the relationship between the composition and the fracture strength of grinding wheels is discussed. The results obtained are as follows : (1) The fracture strength of grinding wheels is influenced with the effective area rate in wheel section area and the equivalent strength of bond in intercrystalline fracture, and is influenced with the effective area rate and the equivalent strength of grain in transcrystalline fracture.(2) Under the same composition of grinding wheels, the fracture strength varies inversely as the root of the side length of grain (average grain diameter).(3) In the case that the volume percentage of grain is υg, the volume percentage of bond is υb, the side length of grain is d0 and the constants depending on the kinds of grain and bond are Kg and Kb, the relationship between the composition of grinding wheel and the fracture strength is expressed asσ=Kgυg2/3d0-0.5 [1-exp {-1/υg2/3·Kb/Kg·υb/3 (1-3√υg)}] or1/σ=3 (1-3√υg)/υb·√d0/Kb+1/υg2/3·√d0/Kg
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