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웰드라인 제거를 위한 고온 기체 분사를 이용한 금형 표면의 가열기법
김경하,김선경,유영은,제태진,최두선,Kim, Gyeong-Ha,Kim, Sun-Gyeong,Yu, Yeong-Eun,Jea, Tae-Jin,Choi, Du-Seon 한국금형공학회 2008 한국금형공학회지 Vol.2 No.2
The application range of injection molded parts is expanding by the development of engineering plastics with good mechanical properties. Plastic products are specially used as automotive parts due to an excellent performance in the characteristics of a strength vs. weight. In this study, heating type of new method such as jet injection was applied to improve heat transfer coefficient is substituted for heating method of injection molding.
정원석(Won Seok Chung),권오명(Ohmyoung Kwon),최두선(Du Seon Choi),이준식(Joon Sik Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
This paper suggests and demonstrates a novel flow measurement technique, tunable AC mode hotwire<br/> anemometry that allows simple integration, robust measurement, and extremely high accuracy. The principle<br/> and simple theoretical analysis of the technique are shown. To find the optimal frequency at which the phase<br/> lag becomes most sensitive to flow speed change, the phase lag was measured scanning the heating frequency<br/> from 1 to 100 Hz, while the flow speed of ethanol was increased stepwise from 0 to 10 mm/s. To optimize the<br/> sensitivity of technique, the periodic thermal characteristic of the hotwire should be understood and is<br/> currently under study.