普通炭素鋼切削に現われる超硬合金工具の損傷

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We observed the failures of five different kinds of cemented carbide tools with grades S1, S3, TX2, TX3, and G1 at cutting plain carbon steel, showing the predominant tool failures for the grades and cutting condition used applying the fundamental classification of the tool failures appearing at the cutting of steels. In this experiment, we carried out the intermittent cutting test besides the usual continuous cutting. Here, we noticed that the high feed in usual continuous cutting accelerats the occurrance of the crater because of its high temperature and pressure on the top face of tool, while the intermittent cutting accelerats the rise of chipping by its severe impact. The occurrence of cratering and chipping are the most fundamental causes of tool failures, the grade possessing the properties resisting against these occurrence to the maximum extent being the most favourable for machining practice. In this experiment, we could not find such a grade. This fact shows that the resisting properties of the carbide grade against chipping and cratering are essentially contrary each other, that is, the superior grade in one property is inferior in the other. However, we recognized that it was possible to estimate simply these important properties on applying high feed in normal and intermittent cutting under the moderate cutting condition, respectively. From the test results, we knew that the grade S1 containing much amount of TiC was best for its highly resisting property against cratering and flank wear, although inferior against chipping. On the contrary, the grade TX3 containing TaC was superior against chipping, although inferior against cratering. Namely, each grade S1 and TX3 has its reasonable applicability for machining practice. On the other hand, the grade S3 and G1 don't stand for use of their poor resisting properties against both chipping and cratering, as far as plain carbon steel concerns.
社団法人日本材料学会の論文
1957-10-15

普通炭素鋼切削に現われる超硬合金工具の損傷

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