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Experimental study on injection molding parts weight according to foam molding process
정현석,홍청민,이하성,김선용,Jung, Hyun-Suk,Hong, Cheong-Min,Lee, Ha-Seong,Kim, Sun-Yong Korean Society of Die Mold Engineering 2015 한국금형공학회지 Vol.9 No.3
Speaking in general terms the form injection process can be described as a new process-variant of already known structural foam molding technology which roots go back to the early sixties. The most limiting factors of already know foaming processes are large cell size and the lack of uniformity of these cells as well and the inability to foam all kinds of plastic materials. In this paper, Process Study on weight change in injection rate during foaming. Experimental conditions were set as the injection speed 50,150,300 and 450 mm/s. The experiments PA, PA+GF, PP, was confirmed that the weight increase to PP+TA.
정현석(Hyun Suk Jung),유중학(Joong Hak Yoo) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Injection molding machine plays an important role in making plastic parts. In the plastic manufacturing industry, there has been a significant increase in the use of Injection molding machine. Injection molding machine according to hydraulic and electric control system that are separated way. In this paper, the sources of Injection unit measurement performance are discussed. It confirmed high deviation as injection stroke > holding pressure> temperature according to measurement.
정현석(Jung, Hyun-Suk),유중학(Yoo, Joong-Hak) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.4
본 연구는 사출 성형기의 제어 방법에 따른 정밀 검사에 대한 연구를 수행하였다. 실험을 통하여, 유압사출 성형기와 전동식 사출성형기의 스크루 스트로크, 보압, 용융 수지온도에 대하여 정밀도에 미치는 영향을 조사하였다. 또한, 실험에서 얻어진 데이터 편차에 대한 가설 테스트를 수행 하였다. 연구를 통하여 스크루 스트로크, 용융 수지온도, 보압 순으로 편차가 크게 발생하는 것을 알 수 있었다. 유압식 사출성형기가 전동식 사출성형기에 비해 제품 간의 산포가 크게 발생하는 것을 확인하였다. 또한 통계프로그램인 미니탭을 활용하여 스크루 스트로크, 용융 수지온도, 보압에 대한 가설을 설립 한 후 P값을 확인하여 스크루 스트로크, 용융수지온도는 귀무가설(H0)을 채택하였으며, 보압은 상호차이가 발생한 대립가설(H1)을 채택하 였다. A study of a precision test according to the control method of an injection molding machine was carried out. The effects of the screw stroke, holding pressure, melt temperature on both the hydraulic and electric injection molding machine were examined. In addition, hypothesis testing was performed to determine the deviation of the data obtained in the experiments. The conclusions obtained in this study were as follows. Significant deviations in the screw stroke, melt temperature and holding pressure occurred in that order. The hydraulic type showed significantly more variation between the products compared to the electric type. In addition, using a mini tab from the statistics program, a hypothesis was proposed and the P value of the injection stroke, holding pressure, melting temperature injection stroke and melting temperature had adopted a null hypothesis (H0). The holding pressure, which showed mutual differences, adopted an alternative hypothesis (H1).
정현석(Hyun-Suk Jung),손덕수(Deok-Soo Son),장세호(Se-Ho Jang) 산업기술교육훈련학회 2008 산업기술연구논문지 (JITR) Vol.13 No.1
The injection molding industry is in the hard situation where it cannot make both ends meet and guarantee the best products because of unstable injection molding machine which is not enough in reproduction and repetition. Besides, there is the deficiency of human resources because most people dislike laborious jobs and, so far, we have not developed new products which substitute for plastics. However, from now on, all the industrial fields including household electric appliances and automobile industry will have to be dependant on the plastic industry. By the result of above situations, there will be much more studies on the plastic goods. Through this study, I come to realize the importance of industries involved in the injection molding and research laboratories and colleges that study injection molding machine.
Pre-strain과 sensor extending을 활용한 미소 변형에서 높은 민감도를 갖는 변형 센서 제작
Hyun Suk Jung(정현석),Chan Park(박찬),Hyun Woo Lee(이현우),Seong Uk Hong(홍성욱),Hyong Uk Kim(김형욱),Cheol Jeong Park(박철정),Seong Kyung Hong(홍성경),Seong Jin Cho(조성진) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Measuring pulse wave technology has received great attention because it indicates the status of the heart and blood vessels. For measuring precise pulse wave, high sensitivity (gauge factor〉500) at low deformation (〈1% strain) and repeatability are necessary. Because a pulse of blood causes micro-scale deformation of skin, high sensitivity sensor is required to measure the small deformation. However, other studies are low sensitivity under 1% strain and poor hysteresis that makes unreliable repeatability. Here, we fabricated a crack-based strain sensor that has high sensitivity (Gauge Factor〉2,000) at low strain (〈1% strain) with pre-strain (P.S) and sensor extending (S.E) process. We can also control sensitivity and linearity through P.S and S.E as needs.