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김용조,박성대,Kim, Yohng-Jo,Park, Sung-Dae 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.1
Bevel gears are important mechanical parts to transmit power in transportation system high precision parts like bevel gears might be manufactured by closed die forging process for dimensional accuracy. Closed die forging of bevel gears offers the high quality and good mechanical properties and also leads to considerable cost saving. To determinate the proper closed-die forging process for bevel gear forms, three-dimensional finite element simulation for the progressive forging process was earned out and also the simulation results were compared with experimental results.
플랜지형 중공 스핀들의 복합단조 공정설계를 위한 유한요소 시뮬레이션
김용조(Yohng-Jo Kim) 한국기계가공학회 2010 한국기계가공학회지 Vol.9 No.3
A hollow flanged spindle is generally used for the assembly of the driving shaft in some vehicles. This part has conventionally been manufactured by both hot forging and machining process, in which case a circular billet is hot-forged into a flanged spindle blank and then its central part is machined for hollow. Therefore, the development of a new forming technology without further machining processes has strongly been in demand. In this study, a new compound forging process of the hollow flanged spindle was proposed through the finite element simulation. By the proposed compound forging process, both extruding of the spindle body part and piercing for the hollow inside it can be performed at the same time. Metal flow patterns, forging defects and forging forces were investigated through the finite element simulation results.
등속조인트 외륜 열간단조의 금형수명 향상을 위한 단조공정 유한요소해석
김용조(Yohng-Jo Kim) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.3
During the hot forging process, the most common cause of tool failure is wear. Tool wear results in the gradual loss of part tolerances, after which eventually the tool must be replaced or repaired. In order to maximize the lifetimes of forging tools, it is important to investigate the wear mechanisms of these tools. In this study, the hot forging of the outer race of an automotive constant-velocity joint was analyzed by a finite element method to investigate the wear distribution, especially the amount and location of the maximum expected wear damage, using Archard’s wear model, which was modified considering the forging temperature. Forging analyses were carried out after modifying blocker forging tools based on established versions. The modified blocker tools resulted in an increase in the tool life up to 31% with a finisher punch.
김현필(Hyun-Pil Kim),김종현(Jong-Hyeon Kim),김용조(Yohng-Jo Kim),김원일(Won-Il Kim) 산업기술교육훈련학회 2012 산업기술연구논문지 (JITR) Vol.17 No.1
The two color injection molding is recently used for production of IT parts. By this injection molding technology, the molded part in the first molding process is welded to the part molded by the second or third molding process into the final molded product. In this study, the rapid heat cycle molding system is applied to the two color injection molding and then the influence of the rapid heating and cooling cycle on the over injection molding was investigated by injection experiments. The injection trouble, weld line, flash, generated in the over injection molded parts was also investigated and commented upon. The rapid heating of the over injection mold can increase the time of heating and cooling and hence is mainly responsible for the increase of the two color injection molding cycle.
자동차 자동변속기 기어용 합금강의 열간 단조 성형에 따른 기계적 특성 변화에 관한 연구
김화정(Hwa-Jeong Kim),김용조(Yohng-Jo Kim),김현수(Hyun-Soo Kim) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.3
This study investigated the effect of the changes in metal characteristics due to the hot forging on SCR420HB applied to ensure the optimal production of the hot-forging ratio on the mechanical properties of an automotive automatic transmission gear. The microstructural changes in the forging ratio were investigated by adjusting the forging range into multiple ranges from alloy steel. This was done in order to set the optimum forging range given the manufacturing process conditions during the hot forging of alloy steel parts with a carbon content of more than 0.8% wt. The effects of the content change in the microstructure on the mechanical properties due to the use of the part were examined.
금형공구강의 표면성질 향상에 미치는 질소이온주입의 효과에 관한 연구
김화정(Hwa-Jeong Kim),김용조(Yohng-Jo Kim) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.4
The ion implantation technology is generally used in order to improve surface mechanical properties, especially tribological properties, of engineering metals. In this study, experimental works were carried out to investigate the surface properties, such as hardness, wear quantity, wear rate and friction force, of a nitrogen ion implanted tool steel STD11 under dry condition. Specimens for the wear test were made to investigate the influences of the initial ion implantation temperature and the total ion radiation. Wear properties, such as the wear quantity and the wear rate, of the nitrogen ion implanted tool steel were considerably improved, especially under the low sliding speed and the low applied load.