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탄소공구강의 전단설계 변수에 따른 특성 상관관계 연구 (I)
류기룡,노현철,송재선,박춘달,Ryu, Gi-Ryoung,Ro, Hyun-Cho,Song, Jae-Son,Park, Chun-dal 한국금형공학회 2012 한국금형공학회지 Vol.6 No.2
In recent years, technology of press plastic working having made remarkable progress. We can say this because it facilitates mass production and have superior performances in machining speed and equivalency of quality than other processing methods. In characteristics of press plastic working, mold manufacturing according to characteristics of each product should be preceded before processing and it has a great influence on machining speed and quality of products and etc according to manufacturing method. Therefore, mold design technology is a critical technology in press plastic working. There are lots of variables in press plastic working according to worked material, mold materials, conditions of heat treatment, clearance and so on. Abrasion of mold depends on these kind of conditions and sheared surface which is crucial for quality of product also depends on them. In this study, we conduct research on abrasion loss of mold according to 8, 10 and 12% of clearance for thickness of 1.0mm of worked material out of mold design variables of the products whose worked materials are high carbon steel and carbon tool steel by a practical experiment.
[생산기술부문] 관재의 하이드로 포밍 기술에 대한 실험적 연구
박재석(Jae-Suk Park),박춘달(Chun-Dal Park),김영석(Young-Suk Kim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The hydroforming technology has gained in importance over the last few years, because of its potential for substantial weight savings costs reduction and quality improvement such as collision property, shape fixability and rigidity of white body. However, in comparison with the traditional sheet forming process, the hydro forming is much younger and the main development efforts were made in the last 15 years. The new technology, high pressure tublar hydro forming in particular, involves many process parameters to be optimized.<br/> This paper covers a brief overview of the hydro forming simulator as well as design of die and tools. The effects of typical parameters such as internal pressure and axial compression stroke are presented. Moreover, the conditions of forming failure occurrences such as fracture and wrinkle are examinated.
김동환,김병민,오세욱,박춘달,황지선,Kim, Dong-Hwan,Kim, Byeong-Min,O, Se-Uk,Park, Chun-Dal,Hwang, Ji-Seon 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.2
This paper investigates the combined effects of parameters such as die surface finish, die directionality of stoning contact pressure and draw speed on the resulting coefficient of friction. Also, this study show the correlation between the NN(Neural Network) and DOE(Design of Experiments) to reduce the number of experiments without the loss of the effects of parameter upon coefficient of friction. The experiments were run in random order with at least three replicates. It was found that the directional stoning orthogonal to the pulling direction is lower friction than directional stoning parallel to the pulling directi on using FCD55 die and SPCEN.
탄소공구강의 전단설계 변수에 따른 특성 상관관계 연구 (II)
류기룡,노현철,송재선,박춘달,윤일채,Ryu, Gi-Ryoung,Ro, Hyun-Cho,Song, Jae-Son,Park, Chun-dal,Youn, Il-chae 한국금형공학회 2012 한국금형공학회지 Vol.6 No.2
The sheet metal forming proceccing is very important and indispensable in the automotive industry because the accuracy of prsee worked parts is directly related to the automotive quality. But when making mold it is difficult and expensive to modify mold. mold design technology is a critical technology in press plastic working. When design the mold there are lots of variables in press plastic working according to worked material, mold materials, conditions of heat treatment, clearance and so on. Abrasion of mold depends on these kind of conditions and sheared surface which is crucial for quality of product also depends on them. In this study, we conduct research on abrasion loss of mold according to 8, 10 and 12% of clearance for thickness of 1.0mm of worked material out of mold design variables of the products whose worked materials are high carbon steel and carbon tool steel by a practical experiment and perform a comparative evaluation of difference of abrasion loss mold with the alloy tool steel (STD11) and Tungsten Carbide (WC).
탄소나노튜브 강화 SKD11 냉간금형용 하이브리드 탄소나노소결체 제조 및 특성 평가
정성실,문제세,이대열,윤국태,박춘달,송재선,Jung, Sung-Sil,Moon, Je-Se,Lee, Dae-Yeol,Youn, Kuk-Tae,Park, Chun-Dal,Song, Jae-Sun 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.4
SKD11 (ASTM D2) tool steel is a versatile high-carbon, high-chromium, air-hardening tool steel that is characterized by a relatively high attainable hardness and numerous, large, chromium rich alloy carbide in the microstructure. SKD11 tool steel provides an effective combination of wear resistance and toughness, tool performance, price, and a wide variety of product forms. The CNTs was good additives to improve the mechanical properties of metal. In this study, 1, 3 vol% CNTs was dispersed in SKD11 matrix by mechanical alloying. The SKD11+ CNT hybrid nanocomposites were investigated by FE-SEM, particle size distribution, hardness and wear resistance. The CNT was well dispersed in the SKD11 matrix and the mechanical properties of the composite were improved by CNTs addition. It shows good feasibility as cold work die tool.