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시바다 이사오(Isao Shibata),정윤교(Yoon Gyo Jung),정종윤(Jong-Yun Jung),문병준(Byung-Joon Moon) 한국산업경영시스템학회 2002 한국산업경영시스템학회 학술대회 Vol.2002 No.추계
In order to polish complicated-shaped inner surfaces of models, a new polishing method with magnetic congelation liquid was invented, we called this name MAGIC polishing tool. This tool is magnetic fluid at high temperature, can be solidified by cooling. The distribution of abrasives in the liquid can be controlled by magnetic field. Therefore we can make a special polishing tool which has well arranged abrasives inside after cooling. In order to know the fundamental polishing properties of this new polishing tool, brass plate was polished. The polishing tool was pressed and rotated against the brass plate in specified polishing time. After many experiments, it was found that this type of polishing tool provided enough removal rate and surface roughness.
김기욱(Ki-Uk Kim),정윤교(Yun-Gyo Jung),고해주(Hae-Ju GO),신혁(Hyeuk Shin),유한식(Han-Sik Ryou) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
Recently, parallel kinematic machine tool with high accuracy and stiffness is causing great concern in 5-Axis processing which is applied in manufacturing with complicated shape products. However, there are some inherent difficulties in parallel kinematic machine tool such as a collision between workpiece and tool, over-cut and under-cut, verification of tool path route in progress. To solve these problem in advance, it needs machine simulation of parallel kinematic machine tool above all things. the purpose of this study is, therefore, carried out machine simulation for parallel kinematic machine tool and accumulation of technical knowledge for the productivity and efficiency in parallel kinematic machine tool through verification of 5-Axis machining.
원전 CEDM 노즐의 밀봉보수용접시 발생하는 잔류응력에 대한 해석적 연구
강종호(Jong-Ho Kang),정윤교(Yoon Gyo Jung),장윤찬(Yun-Chan Jang),이재봉(Ja-Bong Lee),이원근(Won-Geun Yi),조영태(Young Tae Cho) 대한용접·접합학회 2018 대한용접·접합학회지 Vol.36 No.2
The reactor vessel closure head has many CEDM nozzles through which the control element drive mechanisms pass. The CEDM nozzle weld region of the reactor vessel closure head is composed of Alloy 600 material. It has been found that cracks occur due to the high stress generated during normal operation of the nuclear power plant and the contact environment with the primary cooling water. Seal Weld Repair blocks the environmental factor that may causes primary water stress corrosion cracking(PWSCC) by covering Alloy 600 weld region which is susceptible to PWSCC with Alloy 690 resistant to the stress corrosion cracking. In this study, a finite element analysis was performed to evaluate the effect of residual stress formation by seal weld repair in the nuclear power plant CEDM nozzle. The thickness of the welded structure and the number of welded layers were considered as variables. As a result, we showed that seal weld repair for J-groove weldment of CEDM nozzle can release the tensile residual stress so that the possibility of occurrence of PWSCC can be reduced. Also, it has shown that a multi-layer is more effective and thicker weld bead is more secured for reducing residual stresses in J-groove weld.
황종대(Jong Dae Hwang),허윤녕(Yun Nyoung Heo),오지영(Ji Young Oh),정윤교(Yoon Gyo Jung),조성림(Sung Lim Cho) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.3
As demands for being economical, precise drilling process is on the increase. Therefore, the objective of this study is to develop a step cutter that can be controllable through micro dimension and can be changed from separate manufacturing processes of drilling and boring into an integrated one. In order to attain this object the step cutter is designed with a 3D geometric modeling and the design could be modified easily by using parametric modeling methodology. Also, collision is not occurred during manufacturing process because of cutting simulation. The step cutter is assembled by parts made up of 5-axis machining and sintering. Validation tests are accomplished. They show that developed cutter has characteristics such as reduction of machining time as well as the good surface roughness of the machined hole. Indeed, reliability could be obtained from a durability test.
편심구동장치 시제품 개발을 위한 3D프린팅-5축가공 복합기술
황종대(Jong-Dae Hwang),양준석(Jun-Seok Yang),윤성환(Sung-Hwan Yun),정윤교(Yoon-Gyo Jung) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.2
Since a 5-axis machine tool has two rotary axes, it offers numerous advantages, such as flexible accessibility, longer tool life, better surface finish, and more accuracy. Moreover, it can conduct whole machining by rotating the rotary feed axes while setting the fixture at once without re-fixing in contrast to conventional 3-axis machining. However, it is difficult to produce complicated products that have a hollow shape. In contrast, 3D printing can produce an object with a complicated hollow shape easily and rapidly. However, because of layer thickness and shrinkage, its surface finish and dimensional accuracy are not adequate. Therefore, this study proposes hybrid technology by integrating the advantages of these two manufacturing processes. 3D printing was used as the additive manufacturing rapidly in the whole body, and 5-axis machining was used as the subtractive manufacturing accurately in the joining and driving places. The reliability of the proposed technology was verified through a comparison with conventional technology in the aspects of processing time, surface roughness. and dimensional accuracy.
김기욱,정윤교,고해주,신혁,유한식 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
Recently, parallel kinematic machine tool with high accuracy and stiffness is causing great concern in 5-Axis processing which is applied in manufacturing with complicated shape products. However, there are some inherent difficulties in parallel kinematic machine tool such as a collision between workpiece and tool, over-cut and under-cut, verification of tool path route in progress. To solve these problem in advance, it needs machine simulation of parallel kinematic machine tool above all things. the purpose of this study is, therefore, carried out machine simulation for parallel kinematic machine tool and accumulation of technical knowledge for the productivity and efficiency in parallel kinematic machine tool through verification of 5-Axis machining.