快削鋼の被削性解析(第1報) : 低合金硫黄快削鋼の摩擦特性と切削機構との関連性

概要

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A split tool dynamometer was employed to investigate friction characteristics at the tool-chip interface. Compared to a standard steel, a calcium treated, resulfurized steel shows lower frictional stress near the chip leaving point and shorter chip contact length. The friction on the rake face can be expressed by a characteristic equation which is similar to that proposed by Shirakashi and Usui. On the other hand, high strain rate compression tests at elevated temperatures were carried out using the Hopkinson bar method to evaluate flow characteristics of the steels. On the basis of the empirical equations thus obtained, a simulation analysis was conducted to examine a correlation between the material characteristics and cutting mechanism. It shows that the difference in friction characteristics mainly causes the chip flow, temperature and cutting forces to change : the free-machining steel brings better machinability, though its flow properties are almost the same as those of the standard steel.
公益社団法人精密工学会の論文
1991-05-05