• Title/Summary/Keyword: Grinding characteristic

검색결과 84건 처리시간 0.027초

범용 연삭 숫돌의 고능률 단속 연삭특성 (Grinding characteristics of High Efficient Intermittant Grinding Wheel with Conventional Grinding Wheel)

  • 이상철;홍순익;구양;송지복
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 1996년도 추계학술대회 논문집
    • /
    • pp.61-65
    • /
    • 1996
  • This paper experimentally describes the grinding characteristic of discontinuous grinding wheels in creep-feed grinding. In creep-feed grinding, grinding temperature increases rapidly and thermal damage such as a burn occurs on a workpiece. Discontinus grinding wheel with Conventional grinding wheel shows an exellent cooling effect has been developed. The wheels have 6, 12, 24 pieces of slotted which compare with characteristics of each wheels

  • PDF

페룰의 연삭 가공 특성에 관한 연구 (A Study of Grinding Characteristic of Ferrule)

  • 이석우;최헌종;최영재;안건준
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2003년도 춘계학술대회
    • /
    • pp.974-979
    • /
    • 2003
  • As recently optical communication industry is developed, request of optical communication part is increased. Ferrule is very important part which determines transmission efficiency and quality of information in the optical communication part. Most of ferrule processes are grinding which request high processing precision. Particularly, concentricity and cylindricity of inner and outer diameter is very important. The co-axle grinding process of ferrule is to make its concentricity all of uniform before centerless grinding. Surface integrity of ferrule is affected by kind of grinding wheels, grinding conditions, and characteristic of workpiece and equipment. In this study, surface integrity of workpiece according to change of grinding wheel speed, feed rate, regulating wheel speed and grinding force is investigate to improve the concentricity and roundness of ferrule from many experiments.

  • PDF

Structural Characteristic Analysis of a High-precision Centerless Grinding Machine with a Concrete-filled Bed

  • Kim, Seok-Il;Cho, Jae-Wan
    • International Journal of Precision Engineering and Manufacturing
    • /
    • 제7권4호
    • /
    • pp.34-39
    • /
    • 2006
  • High-precision centerless grinding machines are emerging as a means of finishing the outer diameter grinding process required for ferrules, which are widely used as fiber optic connectors. In this study, a structural characteristic analysis and evaluation were carried out using a virtual prototype of a centerless grinding machine to realize systematic design technology and performance improvements required to manufacture ferrules. The prototype consisted of a concrete-filled bed, hydrostatic grinding wheel (GW) and regulating wheel (RW) spindle systems, a hydrostatic RW feed mechanism, a RW swivel mechanism, and on-machine GW and RW dressers. The loop stiffness values of the centerless grinding machine were estimated based on the relative displacements between the GW and RW caused by grinding forces. The simulated results illustrated that a concrete-filled bed considerably improved the structural stiffness and accuracy of a high-precision centerless grinding machine.

페룰 가공용 초정밀 무심 연삭기의 열 특성 해석 (Thermal Characteristic Analysis of a High-Precision Centerless Grinding Machine for Machining Ferrules)

  • 김석일;조재완
    • 한국정밀공학회지
    • /
    • 제23권1호
    • /
    • pp.193-200
    • /
    • 2006
  • To perform the finish grinding process of ferrules which are widely used as fiber optic connectors, a high-precision centerless grinding machine is necessary. The high-precision centerless grinding machine is consisted of the hydrostatic GW and RW spindle systems, hydrostatic RW feeding mechanism, RW swivel mechanism, on-machine GW and RW dressers, and concrete-filled steel bed. In this study, the thermal characteristics of the high-precision centerless grinding machine such as the temperature distribution, temperature rise and thermal deformation, are estimated based on the virtual prototype of the grinding machine and the heat generation rates of heat sources related to the machine operation conditions. The reliability of the predicted results is demonstrated by the temperature characteristics measured from the physical prototype. Especially, the predicted and measured results show the fact that the high-precision centerless grinding machine has very stable thermal characteristics.

평면연삭에서 가공특성 평가 및 반응표면모델 개발 (Grinding Characteristic Evaluation and Development of Response Surface Models in Surface Grinding Process)

  • 곽재섭
    • 대한기계학회논문집A
    • /
    • 제29권4호
    • /
    • pp.614-623
    • /
    • 2005
  • This study aims to perform the characteristic evaluation of surface grinding for the STD11 material with experimental and analytic techniques based on the response surface model. The grinding force acting on the workpiece and the ground surface roughness were measured according to the change of grain size, table speed and depth of cut. The effect of spark-out on the grinding force and the surface roughness was also characterized. The frictional coefficient between workpiece and grinding wheel could be determined by the analysis of spark-out effect. From the experimental data, the second-order response surface models were developed to predict the grinding force and the surface roughness. Validation of the developed model was examined.

콘크리트 층진 베드를 적용한 초정밀 무심 연삭기의 구조 해석 (Structural Characteristic Analysis of a High-Precision Centerless Grinding Machine with Concrete-Filled Bed)

  • 김석일;조재완
    • 한국정밀공학회지
    • /
    • 제22권2호
    • /
    • pp.172-179
    • /
    • 2005
  • A high-precision centerless grinding machine has been recognized as a core equipment performing the finish outer-diameter grinding process of ferrules which are widely used as fiber optic connectors. In this study, in order to realize the high-precision centerless grinding machine, the structural characteristic analysis and evaluation are carried out on the virtual prototype consisted of the steel bed, hydrostatic GW and RW spindle systems, hydrostatic RW feed mechanism, RW swivel mechanism, and on-machine GW and RW dressers. The loop stiffnesses of centerless grinding machine are estimated based on the relative deformations between GW and RW caused by the grinding forces. And the simulated results illustrate that the concrete-filled bed has the considerable effect on the improvement of the structural stiffness of centerless grinding machine.

고능률 연삭을 위한 연삭유제 공급의 최적화 (Optimal Supply of Grinding Fluid for Creepfeed Grinding)

  • 박재현;홍순익;하만경;송지복
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 1996년도 추계학술대회 논문집
    • /
    • pp.90-94
    • /
    • 1996
  • Thermal problems of creep-feed grinding are more serious than regular grinding. So grinding fluid supply in creep-feed grinding is very important. Grinding fluid supply quantity is not linear with effectiveness because grinding wheel is porosity material and the grinding area is solid contact area. In this paper, by using AE signal, optimal quantity of fluid supply was determined. And surface characteristics of wet creep-feed grinding were analized.

  • PDF

파인세라믹의 연삭가공특성 (Grinding Characteristic of Advanced Ceramics)

  • 정윤교;강재훈
    • 한국정밀공학회지
    • /
    • 제7권2호
    • /
    • pp.105-112
    • /
    • 1990
  • Advanced ceramics have some excellent properities as the material for the mechanical component. It is, however, very difficult to grind ceramics with high efficiency because of their high strength, hardness and brittleness. In this paper, some experiments are carried out to find the basic grinding characteristic of advanced ceramics. Representative advanced ceramics, such as AL/sub 2/ O/sub 3/, ZrO/sub 2/, SiC and Si/sub 3/N/sub 4/and ground with diamond wheels. Special attention is paid to comparison between the conventional and creep feed grinding. Results obtained in this study provide some useful informations to attain the high efficiency grinding of advanced ceramics.

  • PDF

엔지니어링 세라믹스의 평면 연삭 가공 특성에 관한 연구 (A Study on the Surface Grinding Characteristic of Engineering Cramics)

  • 강재훈;허성중;김원일
    • 한국자동차공학회논문집
    • /
    • 제2권6호
    • /
    • pp.38-49
    • /
    • 1994
  • In this study, grindability of some representative engineering ceramics are experimentally investigated using resin bond diamond wheel with conventional surface grinding machine, and proper grinding conditions which can be obtained from various experimental results are established also for mechanical components which are proper to domestic circumstances with high reliability. And through the results of experiment, it is confirmed that grinding energies of the ceramics, especially in the case of $Al_2O_3$, are lower than steel with same machining condition in the conventional grinding because of their fine-brittle fracture mode type removal process, though the ceramics are well-known to unmachinable materials. And moreover, the total pass numbers needed for spark-out process to be completed are depend on their mechanical properties because that grinding stiffness is different from each other. The grinding force, ginding power and ground surface roughness are also measured and compared. Furthermore, the experiments carried out in this study, some useful results are obtained with can guide to grind engineering ceramics with conventional surface grinding machine.

  • PDF