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내덴트성이 우수한 자동차 외판용 고장력 340Mpa급 BH강판 개발
고훙석(Hungsuk Koh),문만빈(Manbeen Moon),신철수(Chirlsoo Shin),오현운(Hyunwoon Oh) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In the this study, the influence of chemical composition(added-Ti, Nb) and CAL(Continuous Annealing Line) condition on baking hardenability(BH) were investigated with various types of HS340㎫ bake-hardenable steels sheet for automobile outside panel. BH value of Ti-added steel was stably expressed over 3kgf/㎟. In order to obtain BH over 3kgf/㎟, Nb-added BH steel is more difficulties in controlling annealing temperature and line speed than Ti-added BH steel.<br/> <br/>
김대온(Daeon Kim),문만빈(Manbeen Moon),신철수(Chirlsoo Shin) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The effects of annealing conditions on the mechanical properties of dual phase steels with two different compositions have been investigated. 0.08C-0.02Si-I.9Mn and 0.07C-0.05Si-2.2Mn steels were used to reveal the effect of soaking temperature and overaging temperature. Micro-structures were observed with Lepera's etching method for delineating the martensite phase of dual phase steels. The best heat-treatment condition of 590MPa grade Dual Phase steels was proposed on the base of this study.<br/>
양우열(WooYul Yang),이승열(Seung Yeol Lee),금영탁(YoungTag keum),황진영(JinYoung Hwang),윤치상(ChiSang Yoon),신철수(ChirlSoo Shin),조원석(WonSuk Cho) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
In order to develope springback reduction technology for high-strength steel sheets, 3 studies have been conducted: dome stretching tests, stepped s-rail forming and springback measurement, and optimally shaped initial blank design. First, to find out the formability of TRIP60, dome stretching test was performed. Next, the stepped s-rail die, which was designed to form a channel type panel with large twist and wall curl, was manufactured and used to know the effect of controlling forming variables, such as blank holding force and flange amount on the springback. Furthermore, new measurement technology of the springback was introduced to define wall curl and twist in geometrically complex panels. Finally, the optimally shaped initial blank was employed to verify one of the best ways to reduce the springback in chanel type, high strength sheet panels.