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980㎫급 고강도 강판의 프레스 마찰특성에 관한 실험적 연구
장성호(S. H. Chang),신광호(K. H. Shin),전용준(Y. J. Jeon),허영무(Y. M. Heo) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
In the study, the used three materials are high-strength steel sheets with a thickness of 1.0 ㎜ and 1.2 ㎜, with tensile strengths of 980 ㎫ and 1180 ㎫. Friction tests at various drawing velocities (5,50 and 100 ㎜/min) and at various holding pressures (1, 2 and 3 ㎫) in the 3 type dies (non-coated, Cr-coated and TD heat-treated dies) were carried out to investigate the friction characteristics. The friction characteristics at each die condition were expressed by revised coefficient of friction in Coulomb’s law. So, the coefficient of friction at various die surface treatment conditions in this study was needed to develop the high-strength steel sheet forming technology.
Plate 가열방식 유리렌즈 성형공정해석을 위한 PBK40 소재의 유동 특성에 관한 실험적 연구
장성호(S. H. Chang),허영무(Y. M. Heo),윤길상(G. S. Yoon),신광호(K. H. Shin),이영민(Y. M. Lee),정우철(W. C. Jung) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Generally, progressive type GMP process is more efficient than batch type because there are advantages that problems of each stage(heating, press, cooling etc.) are easily grasped and a time of production is shortened. But if single cavity is used in progressive type GMP process, there is disadvantage that productivity is decreased. So, in order to improve productivity of progressive type GMP process, it is essential to secure multi cavity mold technic. In this study, as a fundamental study to develop multi cavity used in glass lens molding, we conducted a compression test for PBK40.