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정선환,최성대,권현규,손재률,Cheong, Seon-Hwan,Choi, Seong-Dae,Kweon, Hyun-Kyu,Shon, Jae-Yool 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.2
Recently, the machine tools have been needed for high speed and accuracy to increase productivity. The most Important thing to get a more stabilized machine is to know the frequency response which has an effect on manufacture a lot. This problem should be considered seriously by many researchers. There are many application programs about FEM but Just using FEM program to get information of the object is not enough to put our confidence in the stability of the machine tool design. Therefore, the purpose of this research is to make a study for proving one of the ways to design to produce stabilized a machine more efficiently by comparing FRT method and FEM. At these two tests, we can learn about the frequency response area causing resonance and we can reconfirm the result to trust.
정선환(Seon-Hwan Cheong),최성대(Seong-Dae Choi),김기만(Ki-Man Kim),변용근(Yong-Kun Byun),양승철(Seung-Cheol Yang) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.1
The spring is an important mechanical parts to improve the functions of precision machines, automobiles, ships, industrial machines, and IT devices etc.. The hinge mechanism for LCD monitors is very important to support and maintain the proper position of monitor panel, and the tension spring which is a major parts of hinge mechanism plays a significant roll to provide the supporting force positioning the monitor panel. In this paper, an analysis and experiment were carried out to investigate the fatigue characteristics of the tension spring of hinge mechanism, such as hardness test, fatigue test and fractography analysis. As a result of this study the SWPB with heat treatment and shot peening was found to have the optimal design conditions of tension spring for LCD monitor hinge mechanism.
정선환(Seon-Hwan Cheong),최성대(Seong-Dae Choi),조규열(Gyu-Yeol Cho) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This study was carried out to minimize the lifting force and to design the slim sized frame of a height adjustment mechanism. This unit is designed for the display devices in order to enhance the ergonomics for effective height adjustment as well as to achieve much slimmer frame for the pedestal. A tolerance analysis of 6 sigma was applied to achieve smooth lift at design stage not to change the tolerance specification of gap several times in a roller type of lifting mechanism at mass production stage. The specification of minimum gap and the target of production yield ratio were agreed with a quality team before tooling. A DFSS simulation on drawings had been done with reasonable tolerance and achievable standard deviation(σ) several times until the target spec of gap and yield ratio was met. Once tolerance and deviation(σ) were fixed tooling start was done successfully. A CAE method was applied to achieve a slim design. Design parameters were frozen when those parameters matched the reference strength data of standard model. Through those tolerance analysis and CAE simulation the number of tool modification was reduced and production yield ratio was raised up without arguing quality specification at production stage in the end.
반도체 실리콘 웨이퍼 가공용 폴리싱머신의 구조해석에 관한연구
정선환(Seon-Hwan Cheong),최성대(Seong-Dae Choi),권현규(Hyun-Kyu Kwon),손현수(Hyon-Su Son) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
Although Korea is now the top nation to produce non-memory semi-conductors in the world, but there are lacked informations about the researches and developments for the domestic equipments to manufacture the accurate silicon wafer such as a lapping, and polishing machine. Therefore in this study, as the consideration to develop a domestic polishing machine in the future, some trials were carried out to take some basic design data being useful to improve the structure of a specified polishing machine for silicon wafer. It was focused in plate and frame part that is base part in a polishing machine. Through its' 3D modeling, and structural analysis, the problems were investigated the deformation and stress of major parts, and the improvement methods were proposed by the results of analysis. As results, the thermal deformation in plate that contacts directly with silicon wafer was dominated, and they were known that it was very important to review the design factors to get a stability of thermal, and a structural robustness, too.
반도체 습식공정에서의 수정세ㆍ에칭제 정량공급 시스템에 관한 연구
정선환(Seon-Hwan Cheong),최성대(Seong-Dae Choi),김신호(Shin-Ho Kim) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
The domestic semiconductor manufacturing companies are concentrating on 300㎜ wafers the main purpose of which is to enhance the productivity and to reduce the cost. Two of the most impending research needs in 300㎜ wafer manufacturing processes are the maintenance of the cleanness and the precise supply of DI water and etching chemical at the wet processes. Especially the constant flowrate control is the critical factor of the credibility of integration and the productivity.
정선환(Seon-Hwan Cheong),최성대(Seong-Dae Choi),김신호(Shin-Ho Kim) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.4
Currently, most of all valves using at the semiconductor & LCD manufacturing process are pack less type. Such valves are needed to have the functions to protect perfectly from the leakage of fluid by using bellows and diaphragm instead of the grand packing. But not only those valves made in Korea are not available at this point, but also advanced foreign manufacturers do not open enough their data on the basic technology. Otherwise although they open the data a little, they are almost data about stainless steel for pneumatic valves. In this paper, it was focused on the fluid valves for chemical & DI water based on the data of steel valves which are already using commercially. And also this study concentrated to collect the basic developing data of Eco-On/Off diaphragm valve by ourselves.
정선환(Seon-Hwan Cheong),최성대(Seong-Dae Choi),조규열(Gyu-Yeol Cho) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.3
This study was carried out to minimize the lifting force of a two hinge type stand mechanism. This unit is designed for the display devices in order to enhance the ergonomics for effective height adjustment and maintenance at any preferred position. The unit will be very useful for the mechanism fabricated with a coil spring and disc springs as a torque generator. The maximum and the minimum torque value should be calculated initially for the smooth lift. And the reasonable torque distribution is necessary to prevent any auto lift and auto dropping at any position because the torque generated by coil spring is more sensitive than disc spring in tilting the position. Therefore, the analysis of the coil spring is requisite to issue the specific torque value depending on the distorted angle with securing reliability of a long time storage condition. After the theoretical torque value was calculated, the evaluation was carried out by making a proto-type sample, then distorted angle was updated by experiment. The result of this study can readily be applied to various units for the optimization of the smooth lift.
정선환,최성대,권현규,최언돈,손재률,Cheong, Seon-Hwan,Choi, Seong-Dae,Kweon, Hyun-Kyu,Choi, Un-Don,Shon, Jae-Yool 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.3
Recently, the field of the engineering has been studied about optimum design continuously. Verified data by comparison with simulation and dynamic characteristic analysis enables the design of a machine tool to be modified easily and effectively concerning to the mode shape of the vibration. Especially, BC-500 Line Center has got some problems causing vibration which mainly come from Column and ATC part. So it is necessary to solve those problems by the two kinds of method such as changing structural design and reinforcing with ribs. In this paper, column and ATC part of BC-500 Line center are modified by an optimum design by the analysing method of FEM to avoid vibration. As a result, a more stable machine tool was designed by this simulation as optimum condition.
정선환,최성대,권현규,최은환,Cheong, Seon-Hwan,Choi, Seong-Dae,Kweon, Hyun-Kyu,Choi, Eun-Hwan 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.2
Generally industrial multi-articulated robots are used for parts assembly, welding, and painting processes. The high flexibility of them is very useful to not only parts assembly, welding, and painting processes, but also machining processes. But because of machining processes to need a high stiffness of machine structure, so machining is usually not tried at them, except deburring processes now. During past three years the works are carried out to improve the stiffness of a industrial multi-articulated robot With some gas spring as a first idea in this research area. As a result of that stiffness was significantly up, and found and investigated the machining possibility at it.