バインダレスcBN工具を用いた高速切削環境における刃先温度管理システムの構築

抄録

In high speed turning of gray cast iron using a binder-less cBN tool, an intensive tool wear occurred in continuous machining operation over a period of 50s at the cutting speeds, V exceeding 40.00m/s. Since it was clarified that the intensive wear is caused by an abrupt temperature rise at the tool tip, a tool tip temperature controlling system to suppress the temperature rise and keep the tool tip temperature to a constant value during cutting operation was newly constructed. Applying the system, the tool tip temperature is controlled to an optimum region in which the tool exhibits a self-fixing function through formation of belag (aluminum oxide layer) on the tool flank face. As the results, the tool flank wear rate at cutting speed, V=45.00m/s reduced to as low as 1/50 of the case of machining at same speed without installing the temperature controlling system.