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合金工具鋼의 와이어 컷 放電 加工面에 대한 트라이볼로지적 特性
변운봉,김석삼 경북대학교 산업기술연구소 1994 産業技術硏究誌 Vol.22 No.-
In this paper was examined the tribological characteristics of the worn surface of alloy tool steel STD11, machined by Wire-cut to choose the best work condition. In heat treating the specimens, after quenching in a vacuum furnace, each specimens were treated low tempering and high tempering. Then the 1st cut and 2nd cut were made with different conditions. After that the friction and wear test, for the microscophic observation of worn surface, by using SEM carried out to investigate wear process. The result obtained through this study are summarized as follows. The friction coefficient of the 2nd cut surface was greater than that of the 1st cut surface obtained by Wire-cut E D M. The wear rate of cut surface was higher than that of 1st cut surface obtained by Wire-cut E D M. The wear rate of the Wire-cut E D M surface after high tempering was lower than that surface after low tempering. The Wire-cut E D M surface has a wear mechanism that induces brittle fracture when a crack is generated and grown up to a critical length due to stress concentrations around craters.
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변운봉(Woon-Bong Byun) 산업기술교육훈련학회 2013 산업기술연구논문지 (JITR) Vol.18 No.3
In this paper it has been developed a mass flowmeter system to calibrate flowmeters in low flow rate using a inverter. Because there was some of necessity to make up for the weak point in the comparison calibration method using most calibration institutes. The developed system was identified the improved performance by the various tests that was the assessment of setup variation method, the estimation of calibration measurement capability(CMC), sound level test and power consumption measurement.
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