Abstract
Cutting performance and wear mechanism of PcBN tools in the finishing operation of gray cast iron (FC300) are investigated. The tool life of the case using the high cutting speed condition exceeding 16.7m/s is improved remarkably as compared with the case of usual condition at 6.7m/s. The wear development rate at the condition of cutting speed of 25.0m/s is relatively lower than the other conditions. In order to clarify themain cause of wear at high speed cutting condition, adhesive formed on the tool flank face is observed in detail. It was confirmed that wear behavior of the tool can be classified by the cutting speed of 25.0m/s. At the condition of cutting speed of 25.0m/s, the adhesion on tool surface is composed by aluminum oxide. And the reduction of flank wear rate is caused by the working of aluminum oxide as a protective film. On the other hand, at the condition of cutting speed up to 25.0m/s, the Si is detected in adhesion on flank face. The formation of the SiAlON phase as the results of reaction between Al compound in the tool binding phase and Si in the workpiece material is observed.
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