• Title/Summary/Keyword: prototype tooling

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Implementation of 3-Dimensional Cooling Channel in Injection Mold Using RT Technology (RT 기술을 이용한 사출금형의 3 차원 냉각 채널 구현)

  • Kim J.D.;Hong S.K.;Lee K.H.;Kim M.A.;Lee D.K.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.199-200
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    • 2006
  • It will not be an exaggeration to say that one of the most important features of RT (Rapid Tooling) technology is to easy manufacturing complex shape of cooling channel in injection mold. That is, RT technology is hardly influenced complex shape of tool, Therefore, mold designer can optimize the position and shape of cooling channel whatever they want. In this study, we optimized cooling channel through CAE analysis to solve the problem; prototype-connector-mold applied conventional cooling channel, locally warped by internal stress: The effect of three-dimensional cooling channel was supported by simulation result. But it is impossible to produce injection mold applied three-dimensional cooling channel through machining operation. Therefore, we produced the prototype-connector-mold with three-dimensional cooling channel using Direct Metal Laser Sintering (DMLS) process, and get good-quality prototype-connector without warpage.

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Development of a fixture for 3D Laser Scanning (3차원 전 형상 측정을 위한 고정구의 개발)

  • 최창원;엄현종;박병현;김세나;박미나;이응기
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.142-145
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    • 2004
  • More complex geometric shapes, including freeform surfaces, are adopted for the design of products to emphasize styling or aesthetics. Modeling of these products is extremely difficult, and often impossible. Reverse engineering is an emerging technology that can resolve this problem by generating CAD models from the physical mockups or prototype models. The laser scanner if often used to acquire the surface information of the part, but is limited in its measuring direction, which if fixed only along the z-axis. A Designed fixture of new shape to supplement these problems in this paper. The new fixture using several joints and an tooling ball holder is designed considering the convenience of the part set-up and the accuracy of the registration. The location of the tooling balls can be arranged to avoid the occlusion of the part and to minimize the registration error. The new fixture is apply to an object part having freeform surfaces to verify the effectiveness of the proposed design.

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A Realization of the Process Chain from Reverse Engineering to Rapid Tooling (Reverse Engineering을 이용한 신속 기능성 시제품 제작)

  • 송용억;박세형;하성도
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1996.11a
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    • pp.841-845
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    • 1996
  • Reverse engineering enables a fast creation of CAD model from an existing part without any technical drawing or digital data. This method of data acquisition is necessary in several industrial applications when the modification of an existing product design has to be performed and verified afterwards. In this paper, the surface of an existing ship propeller was measured by a tactile measuring system and the acquired point data of the surface were used for modeling of a solid model in CAD system. By using LOM and casting processes, an aluminum propeller for functional test was manufactured and then its accuracy was measured by a laser scanner and compared with the origin릴 CAD data. As the results show, the use of LOM as a rapid prototyping process and casting as a secondary process delivers a functional prototype propeller which can be used for test purposes.

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Study of Registration of 3D Data by Using the Feature on Products (제품의 특징형상을 이용한 3차원 데이터의 레지스트레이션 방안 연구)

  • Kim, Min-Seok;In, Jae-Jun;Lee, Eun-Gi
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.17 no.4
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    • pp.140-145
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    • 2008
  • Recently more complex geometric shapes, including freeform surfaces, are adopted for the design of products to emphasize style or beauty. Modeling of these products is extremely difficult or often impossible. Reverse engineering is the latest technology that can solve the problem by generating CAD models from the physical mockups or prototype models. Reverse engineering uses the coordinate measuring machine(CMM) to get the shape data of products. CMM is limited by the size of the product; therefore it must need the feature to solve it. The tooling-ball which is generally used for feature has difficulty in being used for soft products. Besides, the higher the accuracy of the tooling-ball is, the more expensive its cost is. This study will develop the feature of high accuracy without additional tools and compare the difference of accuracy by it.

Die Making and Product Prototype Fabrication in Investment Casting by SLA Rapid Prototyping Technique (급속조형기술을 이용한 쾌속정밀주조 금형 및 시제품 제작)

  • Park, Moon-Sun;Kim, Dae-Hwan;Kwak, Jeong-Gi;Hwang, Sang-Moon;Kang, Beom-Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.11
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    • pp.74-80
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    • 1999
  • In this study, a stereolithography apparatus (SLA) prototype is used as a master model to be transformed into the silicone pattern by vacuum tool forming. The tool for the first prototype is fabricated by using this silicone pattern. Following this procedure, a temporary tool with metal powder and epoxy for wax injection is prepared for the die set of quick change type which consists of upper and lower base die나 and an insert die. The die set of quick change type appears to be very effective in casting operation by changing tools rapidly. The original wax pattern is formed through the die set, and is made of lost-was. Finally the lost-wax pattern is applied to investment casting. The final casting product is checked regarding its dimensional accuracy.

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A Study on the Manufacturing of Large Size Hollow Shape Parts for Prototype-Car using Rapid Prototyping Technology and Vacuum Molding (쾌속조형 기술과 진공성형법을 이용한 시작차량용 대형 중공 부품의 제작에 관한 연구)

  • 박경수;양화준;최경현;이석희
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.11a
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    • pp.362-365
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    • 2000
  • Rapid Prototyping(RP) techniques have revolutionized traditional manufacturing methods. These techniques allow the user to fabricate a part directly from a conceptual model before investing in production tooling and help develop new models with significant short time. This paper suggests to new process to manufacture large size hollow shape parts for prototype-car using Rapid Prototyping technology and Vacuum Molding with the reduction of delivery time. In addition, This paper introduces the dividing and combining method to make large size RP master model in spite of the limit of the build chamber dimensions of commercialized RP system and post-processing method to achieve sufficient surface quality.

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Study on the Performance of the Grooves for Fluid Dynamic Bearings (유체동압베어링의 그르브 성능에 관한 연구)

  • Kim, Yeung-Cheol;Seong, Se-Jin
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.60 no.2
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    • pp.91-93
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    • 2011
  • This paper is presented for the performance of the Fluid Dynamic Bearing(FDB) by the groove design and the tooling condition. Recently, spindle motors which require smaller size, lower sound noise, lower vibration, and higher speed of the rotation have been placed in high value-added products including Digital Lightening Processors(DLP), Hard Disk Drives(HDD), and ODDs. The spindle motors using the sintered porous metal bearing have higher vibration and acoustic noise by dry contact and large tolerance of the bearing parts. The Fluid Dynamic Bearing (FDB) with grooves is appropriate for spindle motors adequate in regards to mechanical vibration and acoustic noise. The paper shows the performance comparisons of between sintered porous metal bearing and FDB, and each FDBs according to the tooling deviations of grooves by the Finite Element Analysis(FEA) of the mechanical field. This paper shows the methods to make the grooves, the groove's depth, and the prototype of the motor with the fluid dynamic bearing. The performance characteristics of the grooves with the FDB are verified by the experimental results.

Investigation into Net-Shape Manufacturing of Three-Dimensional Parts by using RP and RT (쾌속 조형과 쾌속 툴링을 이용한 3차원 제품의 정형 가공에 관한 연구)

  • Ahn D. G.;Lee S. H.;Kim K. D.;Yang D. Y.;Park S. K.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2001.05a
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    • pp.16-19
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    • 2001
  • Rapid Prototyping (RP) and Rapid Tooling (RT) were introduced to reduce time-to-market and cost by shortening not only the development phase but also the production phase of the manufacturing process. RP generally builds up a prototype layer by layer, rapidly generating a fully three-dimensional free form shape. RT enables the manufacture of production tools. The integration of RP and RT has the potential for rapid net shaping of thee-dimensional parts, which have geometrical complexity. In this study, net shaping techniques for making three-dimensional parts using RP and RT are described and a sample part are shown. A three-dimensional metal part is manufactured by a new RP process, Variable Lamination Manufacturing by using Expandable Polystyrene Foam (VLM-S), and its application to RT for making a clover punch. In addition, we discussed the technology fusion between metal forming md RP/RT.

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Reconstruction of 3D shape in STL file using slice data for RP (RP를 위한 슬라이스 데이터로부터 STL 포멧의 3차원 형상 재구성)

  • 허민성;최홍식;이석희
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.416-421
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    • 1997
  • This study presents a way to construct 3D shape in STL format from 2D slice data. Nowadays ahape reconstruct has been done in many ares, the application of this method is important especially in Reverse Engineering which reconstructs original shape from cross-section data. Current RP (Rapid Prototyping) is used not only for the verification of a part designed but also for the production and tooling in more effective way. In RP technology, data should be prepared in STL format. In this paper, the way to make 3D shape data in STL format form 2D slice data is described which can be used to reconstruct an original shape in RP equipment.

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Optimization of Build Parameters in SLS Process (SLS의 공정 파라미터 최적화에 관한 연구)

  • Heo, Seong-Min;O, Do-Geun;Choe, Gyeong-Hyeon;Lee, Seok-Hui
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.3 s.174
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    • pp.769-776
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    • 2000
  • RP(Rapid Prototyping) technology is gaining its popularity in building a prototype in all industries. SLS(Slective Laser Sintering) is one of RP technologies, which is focused on tooling processes as well as three dimension solid model. There are several factors, the length and the cross-sectional area of a part, that have an effect on build setup in SLS process. In this paper, the computation on geometrical relationship is used to slice STL file and to estimate these factors. Based on these values, the build setup parameters such as the heating temperature, the laser power, and the powder cartridge feed rate are determined by neural network approaches. The test results show that the computation time is saved and the neural network approach is able to apply to get the optimal parameters of build process within an acceptable error rate.