• 제목/요약/키워드: shrink-fit

검색결과 50건 처리시간 0.03초

열박음축의 고유진동수에 關한 硏究 (A Study on Natural Frequency of Shrink Fit Shaft)

  • 유은열;오재응;임동규
    • 한국음향학회지
    • /
    • 제9권2호
    • /
    • pp.14-24
    • /
    • 1990
  • 본 논문에서는 열박음 부분을 모델링하여 그 부분에서의 단위길이당 스프링강성을 산정한다음 전달매트릭스를 구하였다. 여기에 MYKLESTAD 방법을 토대로 하여 축의 전달매트릭스를 구하였다. 열박음축에 대해서는 수축공차에 따른 고유진동수를 구하였으며, 열박음효과의 효율성을 위하여 똑같은 크기의 열박음 하지 않은 축과 비교검토 하였으며 이를 실험으로 검토하였다. 연구결과 수축공자가 커지면 커질수록 단위길이당 스프링강성은 증가 하였고 고유진동수도 증가하였다. 그리고 열박음축은 열박음 하지 않은 축보다 고유진동수가 감소하였다.

  • PDF

냉간단조품의 정밀도향상을 위한 금형해석 기법 (Methodology of tool analysis to improve the accuracy of cold forged parts)

  • Kim, T.H.;Kim, B.M.;Park, J.C.
    • 한국정밀공학회지
    • /
    • 제12권1호
    • /
    • pp.29-37
    • /
    • 1995
  • In many metal forming processes, it is common to use stress rings for reducing elastic deformation and failures of forming dies. But, shrink fit of dies inner diameter of die insert, machining is reuqired after shrink fit processes. The reduction of inner diameter can be predicted by the analysis of elastic-plastic finite element method. The dimension of dies before shrink fit can be determined to minimize or remove machining after shrink fit processes by deformation analysis of die. The computation of contacting stresses along die surface was analyzied by rigid plasitic finite element method, and data were interpolated by the contact search algorithm. In this paper, we propose the analysis method of forging dies after shrink fit and forming to improve dimensional accuracy of final products.

  • PDF

형상기억합금을 이용한 열박음 공구홀더 개발 (Development of Shrink-Fit Tool Holder using Shape Memory Alloys)

  • 신우철;노승국;김병섭;박종권
    • 한국생산제조학회지
    • /
    • 제19권6호
    • /
    • pp.889-894
    • /
    • 2010
  • Conventional shrink-fit tool holders have positive features, such as high accuracy, high strength, high stiffness and low sensitivity to centrifugal forces, but they require heavy investments for heating and cooling equipment. Generally the heating equipment has to heat the tool holder up to $200{\sim}300^{\circ}C$ for tool changes. This paper introduces a novel shrink-fit tool holder that is able to unclamp a tool at $40{\sim}50^{\circ}C$. This feature makes it possible to switch between the clamped and unclamped states by using a simple device, which has lower power, smaller size and lower cost than the heating equipment of the conventional shrink-fit tool holders. The proposed shrink-fit tool holder is able to expand its tool hole by using the shape memory alloys which are integrated in the tool holder body. Performances of the SMA shrink-fit tool holder were evaluated experimentally. The experimental results confirm that the proposed tool holder is feasible in aspects of clamping/unclamping operations, clamping force and repeatability of tool setup.

냉간단조에서 금형 열박음 영향의 정량적 분석 (Quantitative Analysis of Effect of Shrink Fit in Cold Forging)

  • 이추실;김민철;정동찬;손요헌;전만수
    • 한국정밀공학회지
    • /
    • 제28권3호
    • /
    • pp.301-307
    • /
    • 2011
  • In this paper, effects of major design parameters of cold forging dies on die mechanics are quantitatively investigated with emphasis on shrink fit using a thermoelastic finite element method. A ball-stud cold forging process found in a cold forging company is selected as a test process and the effects of die insert material, magnitude of shrink fit, dimension of shrink ring, number of shrink rings, partition of die insert and clamping force on effective stress and circumferential stress are analyzed. It has shown that the number of shrink rings, magnitude of shrink fit, and Young's modulus of die insert material have strong influence on compressive circumferential stress in die insert but that the influence of the other design parameters is relatively weak.

동부스바 인발 금형설계 (Die Design of Drawing for the Copper Bus-bar)

  • 권혁홍;이정로
    • 한국공작기계학회논문집
    • /
    • 제11권4호
    • /
    • pp.82-88
    • /
    • 2002
  • Copper bus-bar is made by drawing process and used in many part of industry. Ohen design drawing die for copper bus-bar, design factor is focused on the deformation of die-land by drawing force and shrink fit. In this paper it is analyzed to determine shrink fit value by shrink fit analysis program which is used with APDL/UIDL language in a commercial FEM package, ANSYS. The shrink fit analysis has been developed that enables optimal desist of the dies taking into account the elastic deflections. Elastic deflection is generated in shrink fitting the die inserts and that caused by the stresses generated using DEFORM software for drawing process analysis. This data can be processed as load input data fir a finite element die-stress analysis. Process simulation and stress analysis are thus combined during the drawing die design. The stress analysis of the dies is used to determine optimized dimension of die-land.

공작기계용 고속 볼베어링의 최적 끼워맞춤에 관한 연구 (A Study on the Optimum Shrink-fit for High Speed Ball Bearing of Machine Tool)

  • 김웅;이춘만;황영국
    • 한국정밀공학회지
    • /
    • 제27권9호
    • /
    • pp.94-102
    • /
    • 2010
  • The spindle is the main component in machine tools. To develop high speed machine tools, a lot of studies have been carried out for high speed spindle. Bearing is very important part in spindle. The bearing clearance is influenced by shrink fit and thermal expansion during operation. The designer must take into account the reduction of shrink fits. The aims of this study are to grasp the shrink fits and behavior of a bearing which is a deeply connected with fatigue life of bearing and performance of spindle through FEM(Finite Element Method). This paper proposed optimum value of shrink fit considering deformation of spindle and stress of fitting area using design of experiments. Thus, the proposed formula can be used to obtain bearing internal clearance.

냉간단조에서 금형 열박음 영향의 정량적 분석 (Quantitative analysis of effect of shrink fit in cold forging)

  • 이추실;이민철;정동찬;손요헌;전만수
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 2009년도 추계학술대회 논문집
    • /
    • pp.119-123
    • /
    • 2009
  • In this paper, effects of major design parameters of cold forging dies on die mechanics are quantitatively investigated with emphasis on shrink fit using a thermoelastic finite element method. A ball-stud cold forging process found in a cold forging company is selected as a test process and the effects of die insert material, shrink fit, dimension of ring, partition of die inert and clamping force on effective stress and circumferential stress are analyzed.

  • PDF

APDL/UIDL을 이용한 동부스바 인발금형에 관한 연구 (A Study on the Copper Bus-bar Drawing Dies using APDL/UIDL)

  • 권혁홍;이정로
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 2001년도 제4회 압출 및 인발가공 심포지엄
    • /
    • pp.45-53
    • /
    • 2001
  • Copper bus-bar is made by drawing process and used in many part of industry. When design drawing die for copper bus-bar, design factor is focused on the deformation of die-land by drawing force and shrink fit. In this paper, to determine shrink fit value is analyzed by automatic shrink fit analysis program, APDL/UIDL language in a commercial FEM package, ANSYS, has been developed that enables optimal design of the dies taking into account the elastic deflections generated in shrink fitting the die inserts and that caused by the stresses generated in the process and by using DEFORM software for drawing process analysis. This data can be processed as load input data for a finite element die-stress analysis. Process simulation and stress analysis are thus combined during the drawing die design. The stress analysis of the dies is used to determine optimized dimension of die-land.

  • PDF

부스바 금형에 관한 연구 (A Study on the Bus-bar Dies)

  • 권혁홍;이정로;전현진
    • 한국공작기계학회:학술대회논문집
    • /
    • 한국공작기계학회 2001년도 추계학술대회(한국공작기계학회)
    • /
    • pp.166-171
    • /
    • 2001
  • Copper bus-bar is made by drawing process and used in many part of industry. When design drawing die for copper bus-bar, design factor is focused on the deformation of die-land by drawing force and shrink fit. In this paper, to determine shrink fit value is analyzed by automatic shrink fit analysis program, APDL/UIDL language in a commercial FEM package, ANSYS, has been developed that enables optimal design of the dies taking into account the elastic deflections generated in shrink fitting the die inserts and that caused by the stresses generated in the process and by using DEFORM software for drawing process analysis. This data can be processed as load input data for a finite element die-stress analysis. Process simulation and stress analysis are thus combined during the drawing die design. The stress analysis of the dies is used to determine optimized dimension of die-land.

  • PDF

초고속기용 열박음 로터 제작을 위한 로터의 치수에 따른 가열온도의 해석적 예측 (Analytical Prediction of Heating Temperature to Manufacture Rotor with Shrink Fit for Ultra High Speed Motor According to Change Dimension of Rotor)

  • 홍도관;우병철;정연호;구대현;안찬우
    • 대한기계학회논문집A
    • /
    • 제33권9호
    • /
    • pp.963-968
    • /
    • 2009
  • This paper deals with shrink fit analysis of rotor by 2D cross-section, 2D axis-symmetry, and 3D FEM model. And this paper presents 2nd order approximation function of thermal expansion displacement by design variables (shape dimension, heating temperature, sleeve length, interference etc.), table of orthogonal array and RSM(response surface methodology). The possibility of the rotor with shrink fit is evaluated by thermal expansion displacement. If thermal expansion displacement is larger than interference, shrink fit enable to make the rotor. 2D axis-symmetry model and 3D model are more reasonable than 2D cross-section model, because stress and strain is different along length of shaft.