원통연삭시 연삭휠의 종류에 따른 연삭 가공특성에 관한 연구

이충석(Choong-Seok Lee),채승수(Seung-Su Chae),김택수(Taeck-Su Kim),이상민(Sang-Min Lee),박휘근(Hwi-Keun Park),이종찬(Jong-Chan Lee) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.1

This paper reports some experimental results of cylindrical external grinding using CBN wheels. Many experimental studies for surface grinding have been done, but not for the cylindrical grinding due to the difficulty of grinding force measurement. In this paper a new experimental device has been proposed for the grinding force measurement in cylindrical grinding. The cylindrical grinding experiments were carried out at various grinding conditions with several CBN grinding wheels. The experimental results indicate that the CBN wheels with smaller grains result in the higher grinding forces in both SCM415 and STD11 workpieces. The grinding forces of all wheels were proportional to the infeed speeds and the difference of each wheels was prominent at high infeed speed for SCM415.

웨이퍼 연마용 지능형 연삭시스템 개발

김동석(Dong-seok Kim),최춘규(Chun-kyu Choi),하상백(Sang-baek Ha),이상직(Sang-jik Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4

In silicon wafer manufacturing process, the grinding process has been adopted to improve the flatness of wafer. The grinding of wafer is usually used by the infeed grinding machine. The infeed grinding machine has been depended on imports. Therefore, it is necessary to develop the infeed grinding machine because the demand of the infeed grinding machine is increasing more and more. This paper describes the technologies of infeed grinding machine and intend to introduce the studies in the development of the intelligent grinding system for grinding of wafer. The air bearing spindle for the infeed grinding machine was developed by domestic technologies and the grinding part design of the intelligent grinding system for wafer grinding was completed.

공작기계 특성을 고려한 최적연삭조건 설정방법

김건회 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.5

In order to utilize the information of well-known grinding database or grinding machine characteristics, a database needs to be designed by considering the delicate property of the machine tools for the high precision and quality of the demanding specification. Among the machine tools, machining conditions of the grinding are various and knowledge repeatance obtained from the grinding process are less credable. Therefore it is desirable for database, which is used to set the grinding conditions, to utilize the maximum machine tool capability. The present paper studied on the occurance limit of chatter vibration and burn considering the characteristics of machine tool. And also basic experiments were performed to establish the optimum grinding conditions which could maximize the grinding efficiency.

세라믹 연삭에서 다이아몬드 휠의 연삭 특성 및 마멸 거동

박병규,문홍현,김성청 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.5

The characteristics of grinding and wear behavior of diamond wheel for grinding ceramic materials was investigated in this study. In case of Si₃N₄, the wear of wheel was large, the grinding force was relatively stable and the fluctuation of surface roughness was small. On the other hand in case of Al₂O₃ and ZrO₂, the wear of wheel and surface roughness were decreasing the grinding force was increasing. During grinding with vitrified bond wheel, Si₃N₄ shows renewal of cutting edge while Al₂O₃ and ZrO₂ show glazing phenomenon of cutting gram. We have found that it possible to observe the behavior of grinding wheel by grinding ratio, grinding resistance, surface roughness and cutting edge ratio. Through the grinding experiments, it was found that grinding life of diamond wheel is 20 times for Si₃N₄ and 40 times for Al₂O₃ and ZrO₂.

섬유 산업용 연삭숫돌의 설계 및 성형공정 개발

김상오(Sang-Oh Kim),구양(Yang Koo),하만경(Man-Kyung Ha) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-

The grinding process is dissimilar to other conventional machining methods such as turning and milling. The difference between them is due to not only the cutting edges of the grinding wheel don’t have the uniformity but also the edges act differently on the workpiece at each grinding. In spite of many researches during past decades, describing the grinding action between the grinding wheel and the workpiece was not made clearly. So statistical models and computer simulations that could overcome the variety of the cutting edges were introduced. These complexities and difficulties of illustrating the grinding process also raised an obstacle to the optimization of the grinding process and to the verification of the interrelationship between the grinding parameter and the obtained grinding result. In present paper, the finest grinding wheel for textile industry was developed by using the response surface method, genetic algorithm and Taguchi method to predict surface roughness and wear of the grinding wheel.

연삭시스템의 최적연삭가공조건

이석우(S. W. Lee),최영재(Y. J. Choi),허남환(N. H. Hoe),최헌종(H. Z. Choi) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월

In silicon wafer manufacturing process, the grinding process has been adopted to improve the flatness of water. The grinding of wafer is usually used by the infeed grinding machine. Grinding conditions are spindle speed, feed speed, rotation speed, grinding stone etc. But grinding condition selection and analysis is so difficult in grinding machine. In the intelligent grinding system based on knowledge many researchers have studied expert system, neural network, fuzzy etc. In this paper we deal grinding condition selection method, Taguchi method and Genetic Analysis.

평면연삭에서 숫돌의 종류와 연삭조건에 따른 표면거칠기 및 연삭숫돌의 파괴

오동석,이병곤,이종훈 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.4

In this study, the variation of surface roughness was tested in surface grinding for the three winking materials SM45C, heat-treated SM45C, and gray cast iron. It was performed for the various grinding wheels with two grain size #60, #100, and three grade I,O,R and various grinding depths and feeds. The fractural grinding depths which were obtained when the grinding wheels were destructed in surface grinding works, were examined and compared with the calculated value sug-gested in this study. The results showed that the surface roughness was decreased by decreasing grinding depth, and feed, and increasing grain size and grades. The fracture grinding depths were increased by increasing grain size, grade and feed.

내륜 트랙 정밀연삭장비 지지구조물의 정 · 동강성 해석

한혜원(Hye Won Han),한승호(Seung Ho Han) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.10

내륜 트랙 연삭기는 자동차용 등속조인트의 주요 부품 중 하나인 볼베어링 내륜 트랙을 정밀 연삭하는 전용 공작기계이다. 버필드 조인트 형태의 등속조인트에 적용되는 내륜 트랙은 볼베어링이 장착되는 6개 또는 8개의 홈을 갖고 있으며, 0.5㎛ 이내의 표면조도가 확보되어야 한다. 볼베어링 내륜 트랙연삭기는 주어진 표면조도의 확보는 물론 대량 생산을 위한 공작시간 등과 같은 요구조건을 만족해야 한다. 이러한 요구조건을 만족시키기 위하여 가공기구의 특성상 연삭축 및 조정차축으로 구성된 주축계의 정밀도는 물론 이를 지지하고 있는 베드의 강성이 확보되어야 한다. 정적 및 동적 구조해석을 통해 연삭기의 정강성 및 동강성을 초기 설계 단계에서 평가되어야 하며, 또한 지지구조물인 베드 내부의 리브 형상 최적화 등이 필요하다. 본 연구에서는 새로 개발되는 볼베어링 내륜 트랙 연삭기 베드의 구조강성을 평가하기 위해 정적 및 동적 구조해석을 수행하였으며, 정적 및 동적 컴플라이언스를 추정하였다. 모드해석과 조화가진해석을 통해 연삭기 스핀들 속도에서 가공 정밀도에 영향을 주는 진동 특성을 확인하였고, 정적 및 동적 컴플라이언스로 얻어진 정강성과 동강성을 해석적으로 평가하였다. An inner race ball track (IRBT) grinding machine is presented as a factory-specific equipment for the precision grinding of surfaces on the inner race ball tracks for continuous velocity joints. The inner race ball tracks consist of 6 or 8 grooves with a surface roughness of 0.5㎛, where ball bearings are mounted. The IRBT grinding machine must meet certain requirements to secure a given level of surface roughness and a manufacturing lead time for mass production, in which a machining accuracy of the spindle system and a stiffness of the supported structure must be secured. Static and dynamic stiffness must be evaluated in the early stage of the design process for the grinding machine, and shape optimization of the bed as a supported structure should be carried out. In this study, static and dynamic structural analyses were conducted to evaluate the structural stiffness of the supported structure for the IRBT grinding machine. Modal and dynamic analyses considering harmonic excitation provided vibration characteristics, and the authors investigated how these factors affect the machining accuracy of the IRBT grinding machine. Consequently, the static and dynamic stiffness were estimated analytically by using the static and dynamic compliances obtained by the dynamic analysis for external harmonic excitation at a given spindle speed.

내륜 연삭에 관한 연구

김우강(Woo-Kang Kim),김건희(Geon-Hee Kim) 한국기계가공학회 2011 한국기계가공학회지 Vol.10 No.6

The grinding is a popular process for studying constant velocity joint and process in automobile industry. In this study, The study gives the data of wheel type and grinding of inner race is developed. As a result I obtained the data of grinding conditions makes good surface roughness get a grinding conditions. The grinding characteristics and conditions of inner race were investigated with respect to grinding feed, cutting depth, grinding time. The results were suddenly increased and the detailed surfaces were extremely obtained. Grinding condition was big more affected by grinding time, grinding speed and grinding depth.

휠 베어링용 내면 연삭기의 강성평가 및 치수 최적설계

박성현(Seong Hyeon Park),고한별(Han Byeol Ko),강효림(Hyo Lim Kang),한승호(Seung Ho Han) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4

내면 연삭기는 자동차용 휠 베어링 외륜의 내면을 정밀 연삭하는 전용 공작기계로 가공면의 표면조도가 0.2~0.6μm 이내로 유지되어야 한다. 내면 연삭에서는 외경 연삭에 비해 숫돌의 빠른 회전속도가 요구되므로 연삭기의 구조강성이 충분히 확보되지 않으면 공구계의 강성저하로 인해 정밀연삭이 불가능하다.⁽¹⁾ 따라서 정밀연삭을 위해 가공정밀도에 큰 영향을 미치는 하부 베드 지지구조물의 충분한 정·동강성의 확보와 경량설계를 통한 치수최적화가 요구된다.⁽²⁾ 본 연구에서는 조화응답해석을 수행하여 휠 베어링용 내면 연삭기의 지지구조물에서 나타나는 정·동강성을 평가하였다. 아울러 목표한 가공정밀도에 필요한 정·동강성을 각각 200 및 37N/μm 로 유지하면서, 지지구조물의 43 개 리브 두께를 형상설계 변수로 지정한 치수최적설계를 수행하였다. 이를 통해 지지구조물의 중량을 10% 감소시킨 경량설계가 이루어졌다. The internal grinding machine is a special purpose machine for precision grinding of internal track surface of outer race in automobile wheel bearings, in which the surface roughness should be ensured within 0.2~0.6 μm. In general, the rotation speed of grinding wheel for the internal grinding machine is faster than that of the external grinding machine, so that the structural rigidity should be secured sufficiently. In order to ensure precise machining accuracy, the substructure such as bed structure, which can affect significantly on the precision grinding, provides sufficient static and dynamic stiffness. Also, in the aspect of contradictory design goals, an optimal shape design for the bed structure is necessary to minimize the weight. In the present study, a harmonic response analysis was performed to evaluate the static and dynamic stiffness of the bed structure in the internal grinding machine. Then, the optimal shape design of the bed support structure was followed, in which the thickness of 43 ribs were taken into account of design variables while maintaining static and dynamic stiffness required for the target machining accuracy at 200 and 37N/μm, respectively. As a result, the light-weight design was achieved where the total weight of the bed structure decreased approximately 10%.