• 제목/요약/키워드: 원통 연삭

검색결과 56건 처리시간 0.026초

외경연삭 휠 주축의 진동특성에 미치는 플랜지 결합부의 영향 (Effects of Flange Joint on the Dynamic Characteristics of the External Cylindrical Grinding Wheel Spindle)

  • 김선민;하재훈;이선규
    • 한국정밀공학회지
    • /
    • 제16권10호
    • /
    • pp.118-125
    • /
    • 1999
  • In the grinding process, generally, the exciting forces with high frequency can be generated due to the wheel wear and the grinding process. As the grinding speed increases, the precise investigation about the wheel dynamic characteristics is required. Conventionally the wheel-spindle has been considered with lumped model in dynamic modeling. With this lumped model, the significant mode resulted from the shell mode of wheel can be readily ignored. This paper suggests the new analysis model which includes the shell mode of wheel in modeling the wheel-spindle assembly. Furthermore, based on the suggested model, the effects of the bolt tightening force and the taper tightening force on the dynamic properties are investigated by the finite element modal analysis and the experimental method. As a result of investigation, the shell mode vibration of wheel affects the dynamic characteristics of the spindle assembly. Also, the vibration modes of the spindle assembly are significantly affected by the joint tightening forces.

  • PDF

이중 시간지연을 가지는 비선형 연삭기의 가공 에너지 밀도 최적화 연구 (A Study on the Optimization of Grinding Energy Density for a Non-linear Grinding System with Dual Time Delay)

  • 정지현;김필기;이정인;이수영;이종항;김경동;석종원
    • 한국정밀공학회지
    • /
    • 제30권5호
    • /
    • pp.493-498
    • /
    • 2013
  • The present study treats the optimization process for a non-linear grinding system with dual time delay, mainly from the energetic viewpoint. To this end, the stability of the grinding system is investigated first with regard to the grinding wheel rotation speed. The concept of grinding energy density is newly proposed as the primary figure of merit and this quantity is evaluated at various stable and limit cycle conditions. The computational results show that simple monotonic trend in energy density is observed under stable conditions, whilst rather complicated behaviors can appear when the conditions are associated with limit cycle oscillations. Finally, the relations between the vibration amplitude and the energy density and their implications on the engineering decision/compromise are discussed.

마이크로 코어 핀 정밀 연삭 시스템 (Precision Grinding System for Micro Core-pin)

  • 양지경;이인철;강동성;한봉석;한유진;이정우;송기혁
    • 한국산학기술학회논문지
    • /
    • 제18권4호
    • /
    • pp.50-57
    • /
    • 2017
  • 본 사출 금형을 통해 제품 생산 시 사출 금형 내에서 제품 형상을 형성하는 코어는 금형 내부에 틀의 형태로 가공되어 설치되며 이때 부분적인 코어의 형상을 핀에 가공하여 설치하는 부품을 코어 핀이라 한다. 이러한 사출 코어 용 코어 핀은 제품의 소형화 집적화에 따라 그 크기가 마이크로의 크기로 작아지고 있다. 하지만 이를 가공 시 기존의 센터리스 연삭 장치로는 마이크로 사이즈의 피삭재를 고정하여 밀착 시켜주는 장치의 부재로 인해 진동이 발생한다. 이러한 이유로 마이크로 크기의 직경을 가지는 코어 핀의 경우 가공 시 진동에 의해 변형 발생으로 가공 불량률이 매우 높다. 따라서 본 논문에서는 마이크로 크기의 코어 핀을 가공하기 위해 기존의 평면 연삭기에 설치하여 사용이 가능한 소형의 연삭 시스템을 개발 하였다. 이를 이용하여 코어 핀에 대한 연삭 실험을 진행하였으며 표면 거칠기, 진원도, 원통도의 측정을 통해 성능을 검증하였다.

전해 연속 드레싱을 이용한 마이크로 공구 제작 기술 (A Study on the Micro Tool Fabrication Technology employing ELID(Electrolytic In-process Dressing) Technique)

  • 최재영;이현우;최헌종;이석우;정해도
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2002년도 춘계학술대회 논문집
    • /
    • pp.508-511
    • /
    • 2002
  • With increasing the needs for micro and precision parts, micro machining technology using micro tools has been studied to fabricate a small part with high density such as electronics, optics, communications, and medicine industry more than before. Though these micro tools have developed rapidly, it is difficult to apply them to micro fabrication technologies, because of the inherent manufacturing. In this study, micro tools(wc) to produce micro structures and parts were manufactured by cylindrical grinding machine employing ELID(Electrolytic In-process Dressing) technique and good dimensional accuracy was achieved. Furthermore we researched the characteristics of machining on the micro drilling using micro drills and manufactured micro tools. Finally it is confirmed that manufactured micro tools can be used for micro machining.

  • PDF

원통연삭가공시 레이저 빔을 이용한 금속 표면거칠기의 인프로세스 측정에 환한 연구 (A Study on the In-process Measurement of Metallic Surface Roughness in Cylindrical Grinding by Laser Beam)

  • 김희남;윤여권;이주상;김대욱
    • 한국안전학회지
    • /
    • 제9권3호
    • /
    • pp.41-52
    • /
    • 1994
  • This paper deal with the design of noncontact In-process measurement system which measures the surface roughness during cylindrical grinding. The measuring system is extremely simple and the apparatus proposed is composed of a laser unit, photodetector and optical system. The experimental performance of the apparatus is satisfactory and good results are expected in the actual use. During operation, the surface of a workpiece Is continuously scanned by a laser beam. The experimental results show that the presence of chattering, loading and glazing can be detected sensitively along both circumferential and feed directions and the surface roughness value is obtained from the reading along the feed direction.

  • PDF

전해 연속 드레싱을 이용한 마이크로 공구 제작 (A Study on the Micro Tool Fabrication using Electrolytic In-process Dressing)

  • 이현우;최헌종;이석우;최재영;정해도
    • 한국정밀공학회지
    • /
    • 제19권12호
    • /
    • pp.171-178
    • /
    • 2002
  • With increasing the needs for micro and precision parts, micro machining technology using micro tools has been studied to fabricate a small part with high density such as electronics, optics, communications, and medicine industry more than before. Though these micro tools have developed rapidly, it is difficult to apply them to micro fabrication technologies, because of the inherent manufacturing. In this study, micro tools (WC) to produce micro structures and parts were manufactured by cylindrical grinding machine employing ELID (Electrolytic In-process Dressing) technique and the micro tools are fabricated as square shape with the dimension less than 100${\mu}{\textrm}{m}$. With the micro tools on the same machine, characteristics of micro grooving and drilling are evaluated. Also we compare normal micro machining with ultrasonic micro machining on the vibration table. It is confirmed that the developed micro tools are fully applicable to micro grooving, micro drilling and free form cutting.

CNC 만능 원통연삭기의 CAD/CAM 시스템 개발 (Development of the CAD/CAM System for CNC Universal Cylindrical Grinding Machines)

  • 조재완;김석일
    • 한국CDE학회논문집
    • /
    • 제5권4호
    • /
    • pp.312-318
    • /
    • 2000
  • In this study, an exclusive CAD/CAM system is developed for enhancing the effectiveness and productivity of CNC universal cylindrical grinding machines on which the external/facing/internal grinding cycles and the wheel dressing cycles are integratively carried out. The CAD/CAM system can manage the various processes such as geometry design, NC code generation, NC code verification, DNC operation, and so on. Especially, the feature-based modeling concept is introduced to improve the geometry design efficiency. And the NC code verification is realized by virtual manufacturing technique based on the real-time analysis of NC codes and the boolean operation between workpiece and wheel.

  • PDF

CNC공작기계 이송오차의 발생요인에 관한 실험적 연구

  • 고해주;정윤교
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 1991년도 춘계학술대회 논문집
    • /
    • pp.59-67
    • /
    • 1991
  • 공작기계의 정밀도는 가공물의 최종 치수 정밀도와 직접적으로 연계되는 공작기계의 전체적 성능 평가를 위한 주요인자 중의 하나이다. 공작기계 위치 결정 정밀도에가장 큰 영항을 주는 인자로서는 이송계의강성, Back lash, 안내면의 습동저항 그리고 이송 계의 자세변화등이 해당된다. 본 연구에서는 이송나사로구동되는 CNC 원통 연삭기의 숫돌대(Wheel Head)축 이송 구동계의 오차발생 요인에 대해 실험적인 검토를 수행하였다. 이를 위하여 이송 구동계의 정강성에따른 영향과 이송 안내면의 각운동에 의한 위치정밀도 영향 및 위치 검출 장치의 종류에 따른 위치오차의 재현성(Repeatatility)의 유무를 레이 저 간섭계를 이용한 정밀 측정을 통하여 비교 검토함에 의해 이송 오차를 최소화 시킬 수 있는 CNC 공작기계이송 구동축 설계의 기본 방향을 마련하는데 역점을 두고 연구를 수행하게 되었다.

전해 연속 드레싱을 이용한 마이크로 구조물 제작 (A Study on the Micro Structure Fabrication using Electrolytic In-process Dressing)

  • 이현우;최재영;정해도;이석우;최헌종
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 2002년도 추계학술대회 논문집
    • /
    • pp.258-261
    • /
    • 2002
  • In this study, micro tools(WC) to produce micro-structure and parts, were fabricated ell a cylindrical grinding machine using ELID(Electrolytic In-process Dressing) technique. The shape of the micro-carbide tool was square, corn. The size of the micro-carbide tool was measured less than 10$\mu\textrm{m}$ respectively by SEM(Scanning Electron Microscope). Furthermore, we fabricated micro structure by different processing methods on the desk top cylindrical grinding machine. The manufactured shape was like a tower and the measurement showed that the endpoint of micro structure was $50{\times}50$$\mu{\textrm}{m}$.

  • PDF

전해인프로세스드레싱법에 의한 초정밀 원통 연삭기술 연구 (A Study on the Cylindrical Grinding Technology by Electrolytic In-Process Dressing(ELID) Method)

  • 제태진;이응숙
    • 연구논문집
    • /
    • 통권28호
    • /
    • pp.59-71
    • /
    • 1998
  • The ELID(electrolytic in-process dressing) grinding method is a new precision grinding technique with the special electrolytic in-process dressing by metal bonded grinding wheel, fluid, and power supply. It is possible to make a efficient precision machining of hard and brittle materials such as ceramics, hard metals, and quenched steels by using this method, In this study, a new efficient precision grinding method with ELID was attempted for application to the machining and finishing processes of cylindrical structural components. And, we try to develop the cylindrical grinding technique for mirror surface of ceramics, tungsten carbide and SCM steel, and for the high efficiency grinding of machined parts, for example, ball screw shaft. Electrical characteristics of three different wheel grit sizes of #325, #2000 and #4000 were investigated experimentally. ELID grinding method is proved to be useful for mirror surface generation and efficient machining.

  • PDF