マルテンサイト相を混在させた鋼の切りくず処理性と工具摩耗
1985 年 71 巻 6 号 p. 756-763
詳細
1985 年 71 巻 6 号 p. 756-763
The improvement of chip-disposability has a primary importance in the automation of machining process and the use of unmanned machine tool.
Chip-disposability and tool wear during turning of low alloy steels having ferrite and martensite phases were examined. The experimental results showed the chip-disposability was remarkably improved in the steels mixed with martensite, compared with the spheroidized or normalized steels.
In steels which were mixed with martensite and had the hardness of HV 200350, chips in the high cutting speed region were broken below one curl. The influence of martensite phase on the chip-disposability was discussed through the observation of the microstructure and surface shape of chips.
The wear of hard metal tool in the cutting of steel mixed with martensite tempered at about 300°C was similar to that of the spheroidized steel, and the tool life time of high speed steel tool for the steel tempered above 400°C was considerably longer than that for the steel tempered at 300°C. When the cutting was done with high speeds using a cermet tool, the tool wear for the steel mixed with martensite and not tempered was larger than that for the normalized steel.
