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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.