Effect of a Multiple Reduction Die on the Residual Stress of Drawn Materials
Jeong-Hun Kim,
Chang-Hyun Baek,
Sang-Kon Lee,
Jong-Hun Kang,
Joon-Hong Park,
Dae-Cheol Ko
Affiliations
Jeong-Hun Kim
Precision Manufacturing Systems Division, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
Chang-Hyun Baek
Precision Manufacturing Systems Division, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
Sang-Kon Lee
Ultimate Manufacturing Technology Group, Korea Institute of Industrial Technology, 320, Techno Sunhwan-ro, Yuga-myeon, Dalseong-gun, Daegu 42990, Korea
Jong-Hun Kang
Department of Aeromechanical Engineering, Jungwon University, 85, Munmu-ro, Goesan-eup, Goesan-gun, Chungbuk 28024, Korea
Joon-Hong Park
Department of Mechanical Engineering, Dong-A University, 37, Nakdong-daero 550beon-gil, Saha-gu, Busan 49315, Korea
Dae-Cheol Ko
Department of Nanomechatronics Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
Residual stress may influence the mechanical behavior and durability of drawn materials. Thus, this study develops a multiple reduction die (MRD) that can reduce residual stress during the drawing process. The MRD set consists of several die tips, die cases, and lubricating equipment. All the die tips of the MRD were disposed of simultaneously. Finite element analysis of the drawing process was performed according to the reduction ratio of each die tip, and the variables in drawing process with the MRD were optimized using a deep neural network to minimize the residual stress. Experiments on the drawing process with the conventional die and MRD were performed to evaluate the residual stress and verify the effectiveness of the MRD. The results of X-ray diffraction measurements indicated that the axial and hoop residual stresses on the surface were dramatically reduced.
