| 摘要 |
PURPOSE:To manufacture a revolving cutting tool without any cracking and brittleness at low cost by forming ferrous metal powder particle layer at a part of spiral sintered revolving cutting tool body made of super hard metal and heating, cooling and hardening the above layer so as to remain void. CONSTITUTION:The super hard metal material powder particle of WC-Co series, etc., is formed to the spiral formed raw material with powder extrusion forming method and this is sintered to obtain the spiral sintered revolving cutting tool body 5. The ferrous metal powder particle layer is formed so as to bury the spiral groove ground a part of this body 5 and this powder particle layer is heated, cooled and hardened to form a shank 15. Then, the above ferrous metal powder particle layer is made so as to remain the void in the layer of the shank 15 without forming to 100% true density. The formation of the void can be controlled by selecting particle size distribution, forming die pressure, sintering temp., etc., of the ferrous metal powder particle. By this method, shrinkage strain based on difference between the materials of the body 5 and the shank 15 is absorbed and reduced with the above void. After that, the body 5 and the shank 15 are finishing-worked to obtain the revolving cutting tool having good quality.
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