Abstract
This paper deals with the machinability of BN added Steels in end milling. The cutting tests were carried out by end milling carbon steel JIS S45C, S55C and these BN added steels with carbide tool and TiAlN coated carbide tool. Tool wear, cutting temperature, and, surface roughness were measured and discussed. In end milling BN added steel with square end mill, the progress rate of flank wear width was decreased and fracture at corner was suppressed in comparison with that in machining standard steel. In case of ball end mill, flank wear in end milling BN added steels were smaller in comparison with standard steel. In case of S45C, boundary wear was observed, however it was not observed in end milling BN added steel. BN added showed almost the same surface roughness as standard steel. The temperature of flank wear part in turning work based S55C were 50 °C higher in comparison with S45C base work. The temperature of throw away end mill was higher 100°C in comparison with solid square end mill. There were not significant difference between the temperature in end milling standard steel and BN added steels.
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