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염영진(Youngjin Yum),손진혁(Jinhyug Son),김원혁(Wonhyuck Kim),황정복(Jungbok Hwang),김선웅(Sunung Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
An induction hardening technology has been implemented for increasing the strength of press-formed parts locally by high frequency induction heating, thereby eliminating the need for reinforcements. This technique for increasing the tensile strength of sheet steel was practically applied to the front floor cross member and center pillar reinforcement of a passenger car. In order to obtain the behavior of automotive parts, thermal transfer analysis was performed for the hat-shaped specimen under heat treatment process using LS-DYNA. Temperature distribution and deformed shape from the numerical results were in good agreement with the experimental results by high frequency induction heating process. Martensitic transformation was found in the heating zone through microscopic observation which showed higher hardness. Tensile strength and hardness of the hat-shaped boron steel part were found to increase remarkably by high frequency induction heating.
염영진(Youngjin Yum),김종국(Jonggook Kim),이현우(Hyunwoo Lee),황정복(Jungbok Hwang),김선웅(Sunung Kim),김원혁(Wonhyuck Kim),유승조(Seungjo Yoo) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
A hot stamping technology of vehicle door impact beam made of thin sheet steel has been developed, with the aim of ensuring occupant safety in a side collision. This technology has been implemented to increase the strength of vehicle body parts and to reduce not only the weight of door impact beam but also the number of work processes. Mechanical tests were performed to obtain material properties of hot-stamped specimen and those were used as input data in stamping and structural simulation for optimal design of door impact beam. Strength of hot-stamped door impact beam increased to the value 102% higher than that of conventional pipe-shaped door impact beam and structural simulation showed that hot-stamped door impact beam achieved 28% weight reduction.