| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem in the conventional coated sintered alloy when used as e.g. a cutting tool, that is, marked reduction and dispersion in tool life due to deterioration, in particular, in tool fracture resistance among machining properties in a high feed rate region and also to solve the problems of increase in the number of steps and complexity of a process and resultant increase in manufacturing cost caused by machining, such as polishing and lapping, applied, as a measure to solve the above problem, to the surface of a coating layer. SOLUTION: By smoothing the roughness of the surface of a titanium based film to be an undercoat layer, effects of improving the surface roughness of an alumina film to be an outer layer, reducing friction resistance at machining owing to the resultant smoothness, and accordingly improving tool fracture resistance in a high feed rate region and reducing its dispersion can be produced. Further, because controlling is done according to coating conditions, the necessity of after working can be obviated and also the shortening of a process and the reduction in dispersion of tool life as well as in manufacturing cost can be attained.
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