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노승훈(Seung-Hoon Ro),손재율(Jae-Yul Shon),임요한(Yo-Han Lim),이재열(Jae-Yul Lee) 한국산업융합학회 2009 한국산업융합학회 논문집 Vol.12 No.1
The manufacturing process of the semiconductor is guided by the controller, which is supposed to sense the unexpected shocks and/or vibrations to shutdown the hard disk and the whole system in order to prevent the malfunction. This feature of controller would shutdown the system due to the instability of the controller itself as well as the instability of the manufacturing system. And consequently will cause significant losses. In this study the structure of a controller has been investigated to find ways to suppress the vibrations from the structure. The frequency response test and the computer simulation has been implemented to find the structure with improved stability. The result of the study shows that the relatively simple design alterations can eliminate most of the vibrations.
가공정도 향상을 위한 Milling Machine의 안정화 설계
노승훈(Seung-Hoon Ro),이민수(Min-Su Lee),박근우(Keun-Woo Park),강희태(Hee-Tae Kang),이종형(Jong-Hyung Lee),양성현(Seong-Hyeon Yang) 한국산업융합학회 2011 한국산업융합학회 논문집 Vol.14 No.2
Since the most exclusive machines of the modern industries which require the nano precision rates are evolved from the machine tools, the design of the stable machine tool structure is very critical. Exclusive machines for the modern industries such as semiconductor, solar cell and LED have surface machining processes which are similar to the face cutting and grinding of conventional machine tools. This study was initiated to stabilize a milling machine structure and further to help design those exclusive machines which have similar machining mechanisms. The vibrations inherent to the machine tool structures hurt the precision machining as well as damage the longevity of the structures. There have been numerous researches in order to suppress the vibrations of machine tool structures using the extra modules such as actuators and dampers. In this paper, the dynamic properties are analyzed to obtain the natural frequencies and mode shapes of a machine tool structure which reflect the main reasons of the biggest vibrations under the given operating conditions. And the feasibility of improving the stability of the structure without using any additional apparatus has been investigated with minor design changes. The result of the study shows that simple changes based on proper system identification can considerably improve the stability of the machine tool structure.
안정성 향상을 위한 Wafer Polishing Machine의 지지구조 개선
노승훈(Seung-Hoon Ro),김영조(Young-Jo Kim),김동욱(Dong-Wook Kim),이일환(Il-Hwan Yi),박근우(Keun-Woo Park) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
Polishing is not only one of the most frequently adopted processes in modern industries, but also the most critical one to the surface quality of the products such as semi conductor wafers and LED sapphire wafers. With the required specifications for the wafer surface quality getting more and more strengthened, the manufacturers are spending huge amount of cost to renew the machine to meet the enhanced surface specifications. Surface qualities of the wafers are mostly damaged by the structural vibrations of the polishing machines. In this paper, the dynamic characteristics of a wafer polishing machine have been analyzed through the frequency response test and the computer simulation. And the supporting structure of a polishing machine has been investigated to minimize the vibration transmissions, to improve the stability of the machine and further to reduce the defects of the polished products. The result of the study shows that simple design modifications of the supporting structure without altering the ma in structure of the machine can substantially suppress the vibrations of the machine with negligible expenses.
노승훈(Seung-Hoon Ro),정평수(Pyeung-Soo Jeong),안재우(Jae-Woo An),강희태(Hee-Tae Kang),이태훈(Tae-Hoon Lee) 한국산업융합학회 2010 한국산업융합학회 논문집 Vol.13 No.4
Laser welding is widely used for precision welding because of superior mechanical properties and high productivity. Generally the accuracy of the welding is determined by the distribution of the bead which is affected by the structural vibrations of the equipment. This study was originated to stabilize a laser welding machine to minimize the bead distribution for the precise joining. The structural properties of the laser welding machine have been investigated to analyze the major factors of the vibrations to cause the bead distribution. The ideas for the design improvement have been applied to the simulation model to identify the effects and further to achieve the stability design and to minimize the bead distribution. The result shows that a few simple design alterations can substantially suppress the structural vibrations and improve the welding accuracy. The procedure used for this study can also be applied to similar welding equipments for improving the structural stability and the welding accuracy.
노승훈(Seung-Hoon Ro),이종형(Jong-Hyung Lee),손재율(Jae-Yul Shon),이재열(Jae-Yeol Lee),이원규(Won-Gyu Yi),이문형(Moon-Hyung Lee) 한국산업융합학회 2009 한국산업융합학회 논문집 Vol.12 No.2
The productivity and the precision machining are the major concerns of the machine tools, and the importance of those features will be even more emphasized with the needs of the modern industries. In this paper the dynamic properties of a lathe have been investigated through the frequency analysis test and the computer simulation to minimize the transmission of vibration generated during the machining process. The modifications have been applied to the original structure to suppress the vibration transmission and further for the structure to achieve less vibrations and higher precision machining. The result shows that the machine can have much less vibrations with simple design alterations for minor expenses, the result can also be readily applied to many similar machines for improved stability.
CO<sub>2</sub> 무 배출 침탄 열처리된 SCM415H 소재의 기계적 성질
변재혁,노승훈,이종형,이창헌,양성현,Byun, Jae-Hyuk,Ro, Seung-Hoon,Lee, Jong-Hyung,Lee, Chang-Hun,Yang, Seong-Hyeon 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.9
Vacuum carburizing is supposed to be the superior process to the gas carburizing. However, the vacuum carburizing has the stage in which hydrocarbon gas is supplied into the furnace to be pyrolysis, and consequently the stable heat treatment is hard to achieve due to the soot from the hydrocarbon pyrolysis. Recently, many studies have been made which utilize acetylene gas to overcome this defects. In this paper, the carburizing and the diffusion periods have been selected based on the Harris experimental formula, and the mechanical properties of the vacuum carburized specimen have been compared with those of the gas carburized SCM415H specimen to identify the feasibility of the $CO_2$ free vacuum carburizing process. The result showed that the vacuum carburized materials used have no oxidization of the grain boundaries, and show the 29.8% higher effective hardness depth and the acceptable tensile strength. 진공침탄법은 이산화탄소의 발생이 없는 친환경적인 열처리 방식으로 알려져 있다. 그러나 진공침탄법은 탄화수소 가스(메탄, 프로판)를 노내에 직접 공급하여 열분해하는 과정을 거침으로써 노내에 그을음이 발생하여 안정적인 조업이 불가능한 단점이 있다. 최근에는 이러한 단점을 극복하기위한 불포화 탄화수소인 아세틸렌가스를 이용한 진공침탄법이 활발히 연구되고 있다. 본 논문에서는 아세틸렌가스를 이용한 진공침탄방식의 침탄 및 확산 시간을 변수로 하여 여러 가지 조건에서 열처리를 진행한 후 가스침탄 열처리된 소재와 기계적 성질을 비교 분석하여 이산화탄소 무 배출 진공침탄 열처리 방법의 활용가능성을 확인하였다. 연구결과 본 연구에서 시도된 진공침탄법은 가스침탄에서 나타나는 입계산화층이 발생하지 않았으며 경도 값은 진공침탄 시험편의 유효경화 깊이가 29.8% 크게 나타났으며 인장강도는 가스침탄보다 10%낮게 나왔으나 허용치를 충분히 만족하는 수준이었다.
가공정도 향상을 위한 Glass Cutting Machine의 설계 개선
권인환(In-Hwan Kwon),노승훈(Seung-Hoon Ro),박유라(Yu-Ra Park),이일환(Il-Hwan Yi),길사근(Sa-Geun Kil),박근우(Keun-Woo Park) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.3
Touch panels are widely used in the modern display industry as the cover glass of smart mobile phones and tablet PCs. Glass cutting machines are commonly used to cut the panels into their proper sizes. Vibration of these glass cutting machines is assumed to be the main factor leading to the creation of burrs, notches, cracks, scratches and chips on the cut surfaces, eventually causing defects of the cover glass. In this study, the vibrations of a glass cutting machine used for the shearing of cover glass components were analyzed through an experiment and a computer simulation. The structural properties leading to vibration were also analyzed in an effort to determine design alterations which can suppress these vibrations. Moreover, each design alteration was applied to a computer simulation model to determine the effect of different alteration on suppressing vibration. The results show that simple design alterations can substantially suppress vibrations of glass cutting machines
김영조(Young Jo Kim),노승훈(Seung Hoon Ro),신호범(Ho Beom Shin),신윤호(Yun Ho Shin),정근섭(Keun Sup Jung),남규동(Kyu Dong Nam) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.3
In modern industries, in whichwhere high productivity is one of the most important concerns, machine tools are facing difficulties to satisfy the high high-speed operation, while and at the same time achieve the precision machining. Generally, the vibrations of the structure increase proportionally to the square of the operating speed so that the precision machining is severely damaged with increased speed. which is a must for the high productivity. Therefore, the suppression of the structural vibrations of the machine tools is the a major concern in the machine tool industry in order to achieve the high productivity and the precision machining simultaneously. In this study, the dynamic properties of a machining center structure were analyzed through the experiment and the computer simulations, and furthermore the results from those were compared to confirm the validity of the simulation model. The design alterations were deduced from the analysis and applied to the simulation model to investigate the effects of those alterations to suppress the vibrations of the machine. The result shows that the relatively simple design alterations, without redesigning the main structure of the machine, can suppress the vibrations effectively.
김동욱(Dong Wook Kim),노승훈(Seung Hoon Ro),김건형(Geon Hyeong Kim),양용준(Yong Jun Yang) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.6
Vibrations are generally recognized as the biggest concern in maintaining part" longevity of an All-in-one PC. The vibrations in PCs originate from excitation sources such as the HDD and the cooling fan. In this study, the vibrations from these sources were investigated in order to analyze the individual effects of the parameters on the structural vibrations of the PC; further, we attempted to establish design alterations that could successfully suppress vibrations, in order to achieve improved stability and part’ longevity. The results show that relatively simple design alterations can substantially improve the stability of PCs.