• Title/Summary/Keyword: Milli-Structure

Search Result 36, Processing Time 0.021 seconds

An Experimental Approach of Milli-Structure Sheet Metal Forming (미세 박판 성형 특성에 대한 실험적 연구)

  • Ku, T.W.;Kang, B.S.
    • Proceedings of the KSME Conference
    • /
    • 2001.06a
    • /
    • pp.471-476
    • /
    • 2001
  • Milli-structure components ate classified as a component group whose size is between macro and micro scales, that is, about less than 20mm and larger than 1mm. The forming of these components has a typical phenomenon of bulk deformation with thin sheets because of the forming size. In this study, milli-structure rectangular cup drawing is analyzed and measured using the finite element method and experiment. Generally, milli-structure containers or cases like cellular phone vibrator consist of rectangular-shaped drawing to save installation space. A systematic approach is established for the design and the experiment of the forming processes for rectangular milli-structure cases. To verify the simulation results, the experimental investigations were also carried out on a real industrial product. The numerical analysis by FEM shows good agreement with the experimental results in view of the deformation shape of the product.

  • PDF

A Experimental Study and FE Analysis of the Forming Process with Milli-Component Forming (미세 성형 부품의 성형 공정 해석 및 실험)

  • Ku T. W.;Kang B. S.;Oh S. I.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2001.05a
    • /
    • pp.235-238
    • /
    • 2001
  • Milli-structure components are classified as a component group whose size is between macro and micro scales, that is, about less than 20mm and larger than 1mm. The forming of these components has a typical phenomenon of bulk deformation with thin sheets because of the forming size. In this study, milli-structure rectangular cup drawing is analyzed and measured using the finite element method and experiment. Generally, milli-structure containers or cases like cellular phone vibrator consist of rectangular-shaped drawing to save installation space. A systematic approach is established for the design and the experiment of the forming processes for rectangular milli-structure cases. To verify the simulation results, the experimental investigations were also carried out on a real industrial product. The numerical analysis by FEM shows good agreement with the experimental results in view of the deformation shape of the product.

  • PDF

An Experimental Approach and Finite Element Analysis on Rectangular Cup Drawing Process of Milli-Component Forming (소형부품의 사각 컵 드로잉 성형 해석에 관한 실험적 연구)

  • 구태완;강범수
    • Transactions of Materials Processing
    • /
    • v.10 no.6
    • /
    • pp.471-477
    • /
    • 2001
  • Milli-structure components are classified as a component group whose size is between macro and micro scales, that is, about smaller than 20mm and larger than 1mm. The forming of these components has a typical phenomenon of bulk deformation with thin sheets because of the forming size. In this study, milli-structure rectangular cup drawing is analyzed and measured using the finite element method and experiments. Special containers or cases of cellular phone vibrator to save installation space are produced by rectangular-shaped drawing. A systematic approach is established for the design and the experiment of the forming processes for rectangular milli-structure cases. To verify the simulation results, the experimental investigations were also carried out on a real industrial product. The numerical analysis by FEM shows good agreement with the experimental results in view of the deformation shape of the product.

  • PDF

Finite Element Analysis and Experiments of Milli-Part Forming of Strip Bending Using Grain Element (입자요소계를 이용한 유한요소 해석)

  • Ku T.W.;Kim D.J.;Kang B.S.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2002.02a
    • /
    • pp.266-273
    • /
    • 2002
  • Milli-structure components are classified as a component group whose size is between macro and micro scales, that is, about less than 20mm and larger than 1mm. The bending of these components of thin sheets has a typical phenomenon of bulk deformation because of the forming size. The recent trend towards miniaturization causes an increased demand for parts with very small dimensions. The conceptual miniature bending process enables the production of such parts with high productivity and accuracy. The stress values of the flow curve decrease with miniaturization, which means that coarse grained materials show a higher resistance against deformation, when the grain size is in the range of the sheet thickness. In this paper, a new numerical approach is proposed to simulate intergranular milli-structure in forming by the finite element method. The grain element and grain boundary element are introduced to simulate the milli-structure of strip in the bending. The grain element is used to analyze the deformation of individual grain while the grain boundary element is for the investigation on the movement of the grain boundary. Also, the result of the finite element analysis is confirmed by a series of milli-sized forming experiments.

  • PDF

Development of Manufacturing Technology for Milli-Structure (Milli-Structure 생산기술개발)

  • 나경환;박훈재;조남선
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2000.05a
    • /
    • pp.1039-1042
    • /
    • 2000
  • This research will deal with Innovative manufacturing technology for milli-structure manufacturing technology which is located betweon the traditional manufacturing technology for macro-sized structure and the recently emerging manufacturing technology for micro-scaled structure such as MEMS. There are four fields in this research, which are micro-sheet metal forming technology, micro-bulk forming technology micro-molding technology and micro die making technology. As a project for new-technology in next generation, this research will be carried out through three terms and each term and be composed of three years.

  • PDF

FE Analysis and Experiments of Milli-fart forming Using Grain and Grain Boundary Element (입자요소를 이용한 미세 성형 부품의 유한요소 해석 및 실험)

  • Ku, Tae-Wan;Kang, Beom-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.27 no.1
    • /
    • pp.109-118
    • /
    • 2003
  • The recent trend towards miniaturization causes an increased demand for parts with very small dimensions. Milli-structure components are classified as a component group whose size is between macro- and micro-scale. The manufacturing process of these components of thin sheet metal forming has a microscopic properties in addition to a typical phenomenon of bulk deformation because of the forming size. Also, the material properties and the deformation behavior change with miniaturization, which means that, a coarse grained materials show a higher resistance against deformation, when the grain size is in the range of the sheet thickness. In this study, a new numerical approach is proposed to simulate intergranular milli-structure in forming by the finite element method. The grain element and grain boundary element are introduced to simulate the milli-structure in the bending. The grain element is used to analyze the deformation of individual grain while the grain boundary element is for the investigation on the movement of the grain boundary. Also, the result of the finite element analysis is confirmed by a series of milli-sized forming experiments.

A Study on Dynamic Characteristics of Milli-Gripper using Piezoelectric Actuator (압전 액츄에이터를 이용한 Milli-Gripper의 동적 특성에 관한 연구)

  • Lee, Hye-Jin;Hwang, Jai-Hyuk;Lee, Nak-Kyu;Bae, Jae-Sung;Kwag, Dong-Gi
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2006.11a
    • /
    • pp.439-443
    • /
    • 2006
  • In this paper, a design of milli-gripper using piezoelectric actuator and flexible hinge structure has been suggested, and the dynamic characteristics of the milli-gripper has been analysed and improved. The milli-gripper consists of the operating and amplifier parts, and the perfomance of the gripper be heavily influenced by base excitation disturbances. The dynamic characteristics of milli-gripper has been measured by the FRF based on experimental modal analysis. It has been found by a series of experiments that the performance of the milli gripper using PID control is made a remarkable improvement in terms of gripping forces.

  • PDF

A study on multi degrees of freedom fine motion measurement for milli-structure (밀리구조물의 다자유도 미세 변위 측정법에 대한 연구)

  • 배의원;김종안;김수현;곽윤근
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2000.11a
    • /
    • pp.39-42
    • /
    • 2000
  • Cutrent technological development toward miniaturization requires smaller components. These components usually generate complex multi-DOF motions other than simple 1-DOF motlon. Therefore it is essential to develop measurement methodology for 6-DOF motions. In this paper, a new 6-DOF measurement system for milli-struchlre is presented. This methodology basically employs the Optical Beam Deflection Method (OBDM) with a diffraction grating. A laser beam is emitted toward the difliaction grating which could be attached on the surface of a milli-structue and the incident ray is dif'||'&'||'acted in several directions. Among these difliacted beams, $0^{th}$ and $\pm$ $1^{th}4" order difkicted rays are detected by 4 Quadrant Photodiodes. From coordinate values fram each detector, we can get information for 6-DOF motions with lineariration method, Required resolutions for milli-struchue measurement are suh-micrometer in translation and arcsec in rotation. Experimental results indicate that proposed system has possibility to satisfy this requirement.

  • PDF

Multi-stage forming analysis of milli component for improvement of forming accuracy (밀리부품 성형 정밀도 향상을 위한 다단계 미세성형 해석)

  • Yoon, J.H.;Huh, H.;Kim, S.S.;Choi, T.H.;Na, G.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 2003.10a
    • /
    • pp.97-100
    • /
    • 2003
  • Globally, the various machine components, as in electronics and communications, are demanded to being high-performance and micro-scale with abrupt development of the fields of computers, mobile communications. As this current tendency, production of the parts that must have high accuracy, so called milli-structure, are accomplished by the method of top-down, differently as in the techniques of MEMS, NANO. But, in the case of milli-structure, production procedure is highly costs, difficult and demands more accurate dimension than the conservative forming, processing technique. In this paper, forming analysis of the micro-former as the milli-structure are performed and then calculate the punch force etc. This information calculated is applied to decide the forming capacity of micro-former and design the process of forming stage, dimension of dies in another forming bodies. And, for the better precise forming analysis, elasto-plastic analysis is to be performed, then the consideration about effect of elastic recovery when punch and die are unloaded, have to be discussed in change of dimensions.

  • PDF

A Study on Formed Tool to Machine Milli-structure Mold (미세구조물 금형가공을 위한 총형공구에 관한 연구)

  • Lee, Hi-Koan;Kim, Yeun-Sul;Kim, Do-Hyung;Roh, Sang-Heup;Yang, Gyun-Eui
    • Journal of the Korean Society of Manufacturing Process Engineers
    • /
    • v.2 no.4
    • /
    • pp.5-10
    • /
    • 2003
  • This paper presents the formed tool to machine a milli-structure mold. The formed tool is used to machine the geometrical shape of bearing rubber seal for precision machining. The bearing rubber seal has milli-sized complex geometry. Because it is difficult to machine the unique shape exactly by the conventional tool, the formed tool is used in machining die of the bearing seal. In this paper, it is performed to investigate properties of the formed tool; tool wear, cutting force and machined surface roughness. Tool wear increases rapidly with clearance angle Increase. Thus, the dimension accuracy is affected by the clearance angle.

  • PDF