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1180㎫급 초고장력 강판의 자동차 Sill Side 부품트리밍 금형 개발
차승훈(S. H. Cha),안민수(M. S. Ahn),남재두(J. D. Nam),서판기(P. K. Seo),원광우(K. W. Won),김병민(B. M. Kim) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.10
In order to reduce the weight and improve the crash performance of the vehicle, advanced high strength steel of DP980, CP1180 have widely used in the automotive industry. However, the high strength achieved in the press parts causes severe tool wear or failures, such as adhesion, chipping and fracture at the tool cutting during the trimming and piercing. These result in the excess burr which deteriorates the tool life and causes serious problem in the product quality. The objective of this study is to develop the trimming die of automotive sill side part with advanced high strength steel of CP1180 which will enhance the tool life and meanwhile to achieve good product quality. Clearance is important parameter in the trimming and piercing. FE-analysis is performed to investigate the effect of clearance on the failure of trimming die. As a result of FE-analysis, the characteristics of sheared edge are evaluated with regard to clearance when trimming CP1180. Also, the trimming die of automotive sill side part with CP1180 is manufactured for evaluating the failure on the sheared edge of the die and the burr of part after 5,000 strokes.
홍명표,김우성,성지현,김동혁,배기만,김영석 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.1
The manufacturing industry nowadays has a greater interest in reducing global warming and promoting energy-saving measures than ever before. This has led to the development of eco-friendly manufacturing systems to replace conventional ones. Additive manufacturing (AM) technology, for instance, is expected to contribute to reducing material costs and energy consumption. Unlike conventional material-cutting manufacturing processes, AM enables designs of any shape in manufacturing by adding the necessary parts layer by layer. Direct energy deposition (DED) is one of the many AM technologies available for a variety of commercial steel powders such as P20, P21, SUS420, H13, D2 and other Non-ferrous metal powders. The DED is process that can be applied to various industries, like molding, medicine, and defense. Of these, its application to the molding industry is the most practical, since the process can be used to deposit different materials on existing parts. Using this technology, it becomes possible to manufacture high-functioning parts composed of various materials at reasonable cost. In this study, the DED is used to develop a high-performance and environmentally friendly trimming die. In this study, to develop a high performance and environmentally friendly trimming die using DED, evaluation of mechanical properties of material developed, stress analysis in shear work. The commercialization of the developed technology was evaluated and the commercial application of the developed technology was discussed.
Kwang-Hyeon Lee,Seong-Won Choi,Tae-Jin Yoon,Chung-Yun Kang 대한용접·접합학회 2016 대한용접·접합학회지 Vol.34 No.1
This study applied laser surface melting process using CW(Continuous wave) Yb:YAG laser and cold-work die steel SM45C and investigated microstructure and hardness. Laser beam speed, power and beam interval are fixed at 70 mm/sec, 2.8 kW and 800 ㎛ respectively. Depth of Hardening layer(Melting zone) was a minimum of 0.8 mm and a maximum of 1.0 mm that exceeds the limit of minimum depth 0.5 mm applying trimming die. In all weld zone, macrostructure was dendrite structure. At the dendrite boundary, Mn, Al, S and O was segregated and MnS and Al oxide existed. However, this inclusion didn’t observe in the heat-affected zone (HAZ). As a result of interpreting phase transformation of binary diagram, MnS crystallizes from liquid. Also, it estimated that Al oxide forms by reacting with oxygen in the atmosphere. The hardness of the melting zone was from 650 Hv to 660 Hv regardless of the location that higher 60 Hv than the hardness of the HAZ that had maximum 600 Hv. In comparison with the size of microstructure using electron backscatter diffraction(EBSD), the size of microstructure in the melting zone was smaller than HAZ. Because it estimated that cooling rate of laser surface melting process is faster than water quenching.
이광현,최성원,윤태진,강정윤 대한용접접합학회 2016 대한용접·접합학회지 Vol.34 No.1
This study applied laser surface melting process using CW(Continuous wave) Yb:YAG laser and cold-workdie steel SM45C and investigated microstructure and hardness. Laser beam speed, power and beam intervalare fixed at 70 mm/sec, 2.8 kW and 800 ㎛ respectively. Depth of Hardening layer(Melting zone) was a minimumof 0.8 mm and a maximum of 1.0 mm that exceeds the limit of minimum depth 0.5 mm applying trimming die. In all weld zone, macrostructure was dendrite structure. At the dendrite boundary, Mn, Al, S and O was segregatedand MnS and Al oxide existed. However, this inclusion didn’t observe in the heat-affected zone (HAZ). As aresult of interpreting phase transformation of binary diagram, MnS crystallizes from liquid. Also, it estimatedthat Al oxide forms by reacting with oxygen in the atmosphere. The hardness of the melting zone was from 650 Hvto 660 Hv regardless of the location that higher 60 Hv than the hardness of the HAZ that had maximum 600 Hv. In comparison with the size of microstructure using electron backscatter diffraction(EBSD), the size of microstructurein the melting zone was smaller than HAZ. Because it estimated that cooling rate of laser surfacemelting process is faster than water quenching.
Lee, Kwang-Hyeon,Choi, Seong-Won,Yoon, Tae-Jin,Kang, Chung-Yun The Korean Welding and Joining Society 2016 대한용접·접합학회지 Vol.34 No.1
This study applied laser surface melting process using CW(Continuous wave) Yb:YAG laser and cold-work die steel SM45C and investigated microstructure and hardness. Laser beam speed, power and beam interval are fixed at 70 mm/sec, 2.8 kW and $800{\mu}m$ respectively. Depth of Hardening layer(Melting zone) was a minimum of 0.8 mm and a maximum of 1.0 mm that exceeds the limit of minimum depth 0.5 mm applying trimming die. In all weld zone, macrostructure was dendrite structure. At the dendrite boundary, Mn, Al, S and O was segregated and MnS and Al oxide existed. However, this inclusion didn't observe in the heat-affected zone (HAZ). As a result of interpreting phase transformation of binary diagram, MnS crystallizes from liquid. Also, it estimated that Al oxide forms by reacting with oxygen in the atmosphere. The hardness of the melting zone was from 650 Hv to 660 Hv regardless of the location that higher 60 Hv than the hardness of the HAZ that had maximum 600 Hv. In comparison with the size of microstructure using electron backscatter diffraction(EBSD), the size of microstructure in the melting zone was smaller than HAZ. Because it estimated that cooling rate of laser surface melting process is faster than water quenching.
자동차 본네트 트림 금형 스트립 레이아웃 설계에 관한 연구
정효상,이성수 한국공작기계학회 2002 한국공작기계학회 춘계학술대회논문집 Vol.2002 No.-
Parametric modeling and configuration design methods are a important methods for rapid design in manufacturing. This paper proposes a relation rules which parametrically models a bonnet trimming tool based on Pro/Engineer. The concept of design is applied a trimming die of the bonnet outer panel. Trimming die have a many parameters. Each a parameter is related the die face and punch profile. A design system consists of a Pro/Engineer, a Pro/Program.
Memory Die Clustering and Matching for Optimal Voltage Window in Semiconductor
Yongwon Park,Seokho Kang,Sungzoon Cho Institute of Electrical and Electronics Engineers 2015 IEEE transactions on semiconductor manufacturing Vol.28 No.2
<P>In this paper, we propose a method to optimize the product performance instantly by utilizing the internal voltage trimming circuit for Dynamic Random Access Memory (DRAM) memory. Specifically, we first define the verification wafer as the internal voltage characteristics using the clustering technique. Second, the optimized voltage conditions are applied to a normal wafer being matched with a verification wafer. The proposed method makes the ability to apply a different voltage trimming condition for each dies internal voltage circuit depending on their characteristics, thereby improving the characteristics of the individual dies and reducing the fail bit count (FBC) further. The experimental results on the real-application case show that our proposed method reduces the FBC by 1%-5%, which contributes yield enhancement and quality improvement of DRAM memory by raising the efficiency of the redundancy cell repair in the repair process.</P>