| 摘要 |
PURPOSE:To make high accurate grinding process possible by forming the base disk with specified materials, duly resulting in such effects as to prevent a base disk from breaking caused by outer power of grinding resistance or the like, improve safety performance of a grindstone wheel and solve size change due to heat. CONSTITUTION:An abrasive grain layer 2 containing cubic boron nitride abrasive grain or diamond abrasive grain is stickingly fixed on the outer periphery of the base disk 1 of a grindstone wheel. This base disk 1 is made of materials with tensile strength more than 10kgf/mm<2>, thermal expansion coefficient less than 7X10<-6>/ deg.C, and Young's modulus less than 10,000kgf/mm<2>. Strength of the base disk 1 to external force of grinding resistance or the like becomes bigger by specifying the tensile strength as the above, so as to improve safety performance. Also, size change of the base disk 1 with temperature change is reduced by specifying the expansion coefficient, so as to do grinding processing highly accurately. Still more, vibration caused by grinding process is efficiently absorbed by specifying the Young's modulus, so as to restrain occurrence of trembling.
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