Abstract
Generally, a carbide hob is excellent in durability, cutting with high speed and high accuracy, but it occurres chipping easily. Therefore it is difficult to use under stable conditions. Kurume N.C.T. succeeded in practical application of the carbide hob for the first time in the world during 1970 year. It was used by many production plants, but it was not used by automobile plants under severe conditions. Recently, there has been a growing demand to cut gears without cutting oil for a good environment. To achieve this purpose in a mass-production line for the automobile plant, the authors have successfully developed dry cutting system with the carbide hob by incorporating a highly rigid CNC hobbing machine. This source of success has been accomplished by establishment of the selection system of the hob material is investigated. And after the hob is produced as the experiment, cutting is performed using it on the hobbing machine truly.
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