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김지환(Jihwan Kim),채수원(Soo-Won Chae),한승상(Seung Sang Han),손요헌(Yohun Son) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.5
The use of aluminum alloy parts in the automotive industry has been increasing recently due to its low weight compared with steel to improve fuel efficiency. Companies in the auto parts manufacturing sector are expected to meet the government`s strict environmental regulations. In this study, manufacturing process of aluminum alloy bolt has been designed from forming to heat treatment. Bolt forming process is composed of cold forging for body and rolling for thread. In this study only cold forging process is considered by employing the finite element method. In the cold forging process, preform shape was designed and damage value was considered for die design. Two steps of forging process has been developed by the simulation and a prototype was manugactured accordingly. As a final process, solution heat treatment and aging process was employed. A final prototype was found to meet the required specifications of tensile strength and dimension.
이추실(QiuShi Li),김민철(MinCheol Kim),정동찬(DongChan Jung),손요헌(YoHun Son),전만수(ManSoo Joun) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.3
In this paper, effects of major design parameters of cold forging dies on die mechanics are quantitatively investigated with emphasis on shrink fit using a thermoelastic finite element method. A ball-stud cold forging process found in a cold forging company is selected as a test process and the effects of die insert material, magnitude of shrink fit, dimension of shrink ring, number of shrink rings, partition of die insert and clamping force on effective stress and circumferential stress are analyzed. It has shown that the number of shrink rings, magnitude of shrink fit, and Young’s modulus of die insert material have strong influence on compressive circumferential stress in die insert but that the influence of the other design parameters is relatively weak.