• Title/Summary/Keyword: Multi-tool

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Improvement of the ED-Drilling Machinability using Multi-hole Electrodes (Multi-hole 전극에 의한 Ed-Drilling 가공성 향상)

  • Kim, Chang-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.5
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    • pp.88-93
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    • 2012
  • This paper describes the machinability of the sintered carbide and tool-die steel(STD-11) by electric discharge drilling with various tubular electrodes which have multi-holes. Various types of electrode which have different diameters and materials are used with the application of continuous direct current and axial electrode feed. Inner part of electrodes are inserted with smaller tubes or Y-channel or bar. In ED-Drilling, the dielectric flushed down the interior of the rotating tube electrode, in order to remove machining debris from the hole. As result of experiments, the bigger the diameter of the electrode is, the lower the material removal rate is. Machinability of copper electrode is higher than that of brass. In machining of sintered carbide, to use oil is better than distilled water as dielectric.

A Study on the Frosting Phenomena of Abrasive Waterjet Microcutting for Multi-Layered Materials (연마제 워터젯을 이용한 복합재 미세가공의 백화현상에 대한 연구)

  • Park, Kang-Su;Bahk, Yeon-Kyoung;Go, Jeung-Sang;Shin, Bo-Sung
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.5
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    • pp.183-190
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    • 2007
  • It is well known that abrasive waterjet(AWJ) was developed as a kind of high-density energy processing technologies. AWJ is used to obtain the better cutting quality of various materials such as metals, ceramics, glass and composite materials within a short manufacturing time because of the characteristics of heatless and noncontact processing. However, AWJ device still has some problems to obtain the high quality of thin workpiece. In this paper, we investigated the optimal microcutting conditions of AWJ, such as maximum pressure, cutting speed and standoff distance of thin multi-layered materials. The experimental results show that AWJ has possibilities and potential to apply to the microcutting of thin multi-layered materials for IT industrial applications.

An Improved Dynamic Model for Multi-Stepped Rotor System (다단 회전체 계의 동적 모델 개선에 관한 연구)

  • Hong Seong-Wook;Choi Seong-Hwan
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.2
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    • pp.107-113
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    • 2006
  • This paper presents an efficient dynamic modeling method for multi-stepped rotor system using effective spring elements to take into account the structural weakening effect due to the steps. This paper demonstrates that the Timoshenko shaft model give rise to a significant error in the case of multi-stepped rotors. An effective bending spring model is introduced to represent the structural weakening effect in the presence of steps. The proposed modeling method is validated through a series of simulations and experiments. Finally, a spindle is dealt with as an analysis example.

A multi-layed neural network learning procedure and generating architecture method for improving neural network learning capability (다층신경망의 학습능력 향상을 위한 학습과정 및 구조설계)

  • 이대식;이종태
    • Korean Management Science Review
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    • v.18 no.2
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    • pp.25-38
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    • 2001
  • The well-known back-propagation algorithm for multi-layered neural network has successfully been applied to pattern c1assification problems with remarkable flexibility. Recently. the multi-layered neural network is used as a powerful data mining tool. Nevertheless, in many cases with complex boundary of classification, the successful learning is not guaranteed and the problems of long learning time and local minimum attraction restrict the field application. In this paper, an Improved learning procedure of multi-layered neural network is proposed. The procedure is based on the generalized delta rule but it is particular in the point that the architecture of network is not fixed but enlarged during learning. That is, the number of hidden nodes or hidden layers are increased to help finding the classification boundary and such procedure is controlled by entropy evaluation. The learning speed and the pattern classification performance are analyzed and compared with the back-propagation algorithm.

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An Analytical Study on the Structure Stabilities of Multi-Tasking Machine (복합가공기의 구조 안정성에 관한 해석적 연구)

  • Shin S.W.;Lee C.M.;Chung W.J.;Kim J.S.;Lee W.C.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.455-456
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    • 2006
  • Multi-tasking machines are widely used in machine tool industries nowadays. This study focuses on the effect of load on the structure stabilities of laser multi-tasking machine which is comprehensively combined turning center and laser machine. For design of the machine, simulation of structural analysis is carried out varying number of elements. The analysis is carried out by FEM simulation using the commercial software, CATIA V5. This method showed a proper number of elements can be selected to obtain good result by reduced computation time.

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Development of a Design System for Multi-Stage Gear Drives Considering Configuration Design (배치설계를 고려한 다단 기어장치 설계 시스템 개발)

  • 정태형;김지철;배인호
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2000.10a
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    • pp.398-403
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    • 2000
  • The design of multi-stage gear drives is a time-consuming process that includes additional design problems, which are not considered in the design of single-stage gear drives. In the previous research works, the authors have proposed a new algorithm to design multi-stage gear drives at the preliminary design phase. The proposed design algorithm automates the design process by integrating the dimensional design and the configuration design process. In the configuration design process, the positions of gears and shafts are determined by minimizing the geometrical volume (size) of a gearbox. However, various types of spatial constraints should be satisfied in practical design situation. To locate input and output shaft in specified positions is the typical example of such problems. In this paper, the authors show the formulations of spatial constraints applied to the design of four-stage gear drives. The design solution shows considerably good results, and the design system is confirmed to be readily applicable to practical design situation.

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A Numerical Simulation of a Multi-phase Flow mixed with Air and Water around an Automobile Tire

  • 우종식;김항우
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.4
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    • pp.101-107
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    • 1998
  • A three-dimensional multi-phase flow is simulated around a smooth tire. This simulation is conducted by solving Navier-Stokes equation with a k-$\varepsilon$ turbulent model. The numerical calculations are carried out by modeling a multi-phase free surface flow mixed with air and water at the inlet. The numerical solutions show an intuitively resonable behavior of water around a moving tire. The calculated pressure around the tire surface along the moving direction is presented. The moving velocities of the tire are chosen to be 30, 40, 60, and 70 km/h. The numerically simulated pressures around the tire are compared with existing experimental data. The comparison shows a new possible tool of analyzing a hydroplaning phenomenon for an automobile tire by means of a computational fluid dynamics.

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Development of the Dynamic Simulation Program for the Multi-Inverter Heat Pump Air-Conditioner (멀티 인버터 히트펌프의 동특성 해석 프로그램의 개발)

  • ;;小山繁
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.13 no.11
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    • pp.1079-1088
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    • 2001
  • A dynamic simulation model was developed to analyse the transient characteristics of a multi-inverter heat pump. The programs included a basic air conditioning system such as a evaporator, condenser, compressor, linear electronic expansion valve (LEV) and by-pass circuit. The theoretical model was derived from mass conservation and energy conservation equations to predict the performance of the multi-inverter heat pump at various operating conditions. Calculated results were compared with the values obtained from the experiments at different operation frequencies of compressor, area of the LEV and configuration of indoor units operation. The results of the simulation model showed a good agreement with the experimental ones, so that the model could be used as an efficient tool for thermodynamic design and control factor design of air-conditioners.

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Axisymmetric Multi-Stage Deep Drawing Die Design Analysis Using Finite Element Method (유한요소법을 이용한 축대칭 다단계 딥드로잉 금형 설계 해석)

  • Lee, Dong-Ho;Lee, Seung-Yeol;Geum, Yeong-Tak
    • Transactions of Materials Processing
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    • v.7 no.6
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    • pp.594-602
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    • 1998
  • The design analysis of axisymmetric, multi-stage deep drawing dies was performed using the rigid-viscoplastic finite element formulation. In the formulation the axisymmetric CFS algorithm was employed. Hill's non-quadratic normal anisotropic yield criterion and isotropic hardening rule were considered. For trial initial displacements and tool contact points. the geometric force equilibrium method was adopted. In order to see the validity of the formulation, the multi-stage deep drawing processes of shell-cylinder front part of hydraulic booster were simulated. The simulation showed good agreements with measurments and PAM-STAMP results.

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Optimization to Minimize Deflection of a Large LCD Glass Plate with Multi-Simply Supports (다점 지지된 TFT-LCD 대형 유리기판의 처짐 최소 최적화)

  • Lee H.Y.;Lee Y.S.;Byun S.W.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.861-864
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    • 2005
  • A LCD glass plate is supported by multi-pin and golf-tee type support. In the FEM analysis, the support condition is treated as simply supported boundary .condition. In this study, the optimization on the location of multi-simply support is conducted. The size optimization method of ANSYS 8.0 is used as the optimization tool to search for the optimal support location of LCD glass plate. In the manufacturing process, the support condition is a fatal factor of quality control of LCD production. From the results of optimization, deflection decreases 51% compared with the original model.

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