• Title/Summary/Keyword: conventional forming

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Magnetic Pole Structure of Electro-Magnet for Forming Uniform Magnetic Field (평등자계 형성용 전자석 자극 구조에 관한 연구)

  • 김정태;이승면;조현준;김훈년
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07a
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    • pp.515-518
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    • 2002
  • In this study, the ellipsoidal cap type magnetic pole structure was proposed for the electro-magnet in B-H curve tracer. From the simulation for the electro-magnet without specimen, the area of effective uniform field(99% range for the central field value) was considerably increased in case of the newly proposed ellipsoidal cap type magnetic pole than that of the conventional simple-inclined cap type magnetic pole. Also, through the simulation for the electro-magnet with permanent magnet specimen(NaFe30), the optimal Positions of the magnetic field measurement sensor(Hall sensor) were found out in each case and the errors were decreased in case of the newly proposed ellipsoidal cap type magnetic pole.

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A RESEARCH ON THE FUZZY CONTROL BY A NEW METHODOLOGY OF FORMING THE CONTROL RULE (새로운 제어 규칙 형성 방법에 의한 제어에 관한 연구)

  • Park, Young-Moon;Moon, Un-Chul
    • Proceedings of the KIEE Conference
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    • 1992.07a
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    • pp.252-254
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    • 1992
  • This paper proposes a new algorithm that finds fuzzy control law of the system in which little knowledge has been known. In view or conventional fuzzy method, making control law needs the sense and the knowledge of the system which are provided by expert. But fuzzy control using proposed algorithm needs no expert for hating control law. After construction of the 1st order approximated ARMA model using input-output pairs, new defuzzification method is applied. The deduced rule is stored in fuzzy input space and updated by the proposed algorithm adaptively. To show the validity and effectiveness of proposed control method. simulation result is presented.

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Process Design in Superplastic Forging of a Jet Engine Disk by the Finite Element Method (유한요소법을 이용한 제트엔진 디스크의 초소성 단조공정설계)

  • 이진희;강범수;김왕도
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.4
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    • pp.876-886
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    • 1994
  • Process design in superplastic forming to produce a Nickel-base jet engine disk has been carried out using the rigid-viscoplastic finite element method. This study aims at deriving systematic procedures in forging of superalloy engine disk, and develops a simple scheme to control strainrate within a range of superplastic deformation during the forging operation. The new process, a pancake type preform being used, is designed to have less manufacturing time, and more even distribution of effective strain in the final product, while the conventional superplastic forging of an engine disk has been produced from a cylindrical billet. The jet engine company, Pratt & Whitney, provided the basic information on the manufacturing process of superplastic forging of a jet engine disk.

A Study on Mold Machining for Bearing Rubber Seal by Formed Tool. (총형공구를 이용한 고정밀 베어링 Rubber seal 금형가공에 관한 연구)

  • 김도형;김연술;이희관;노상흡;양균의
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1807-1810
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    • 2003
  • The formed tool is used to machine the unique shape of rubber seal for geometrical shaping and reduction of cutting time. The bearing rubber seal produced by hot press forming has complex geometry for the complex geometrical shape to prevent leakage of lubricant oil and influx of the dust effectively. Because it is difficult to machine the unique shape exactly by the conventional tool, the formed tool is used in machining mold of the seal. In this paper, It is performed for selection of the formed tool to investigate cutting edge wear, cutting force, and surface quality. Also, an efficient high precision machining is proposed on the experiment data.

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A Study on the Forming of Parts for Automobile using Fine Blanking Process (파인블랭킹 공정을 이용한 자동차용 부품의 가공에 관한 연구)

  • 한규택
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1998.10a
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    • pp.267.2-272
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    • 1998
  • The fine blanking is a process of press-working which makes possible to produce thick sheet metal parts of finished sheared surface and close dimensional accuracy over whole material thickness in single blanking operation. Fineblanked parts in general are characterized by their cleanly sheared surface over the whole stock thickness and accurate size for the specific functions. The fine blanking technology is urgently needed to remove secondary operations which are necessary in conventional blanking operation and cost reduction. In this study, the effect of material texture and vee-ring on parts for automobile is investigated by experimental observation and analysis.

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Design Optimization of Bolted Connection with Wood Laminated Composite Beams Subjected to Distributed Loads (분포하중을 받는 목재 적층복합재 빔의 볼트 체결 최적화 설계)

  • Cho, Hee Keun
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.26 no.3
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    • pp.292-298
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    • 2017
  • Numerical analysis for various design parameters should be preceded by optimal design of composite materials. Numerous studies have been conducted on the bolting of interconnecting beams. In this study, the response surface method was applied to optimize the design of bolted joints connected by laminated wood composite beams. The response surface was created by combining the FEA code for composite analysis and the algorithm for forming the response surface. Optimization on this response surface was performed with a genetic algorithm to derive the results. The determination of the optimum bolt-hole position for the connection of composite beams is an optimization problem. Tsai-Wu composite failure index, maximum deflection, and simple von Mises stress are set as the objective functions. It has been proved that the design results of the optimized bolt-hole are superior to the design performance of the existing conventional bolt-hole position.

Induction Heating of a Billet for Semi-Solid Forging (반용융 단조를 위한 소재의 유도 가열)

  • Park, J.C.;Park, H.J.;Kim, B.M.
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.8
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    • pp.15-20
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    • 1997
  • Semi-solid forging is a compound forging technology to develop conventional forging process. Among several steps of semi-solid forging process, the heating step of a billet prior to semi-solid forging step is necessarily required to obtain globular microstructure. For the forming operation to work properly, it is also important to heat the billet uniformly for the uniformity of solid-liquid distribution. To satisfy these requirements, induction heating has been generally used for a long time. This paper presents the method to find heating condition and the temperature distribution inside a billet with a induction heating apparatus by comparing the computer simulation with experiment for aluminium alloys A12024 and A356.

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A Progressive Fine Blanking Process Design for Forming of Carrier Plate (캐리어 플레이트 성형을 위한 프로그레시브 파인 블랭킹 공정의 설계)

  • Kim J. D.;Kang J. J.;Hong S. K.;Kim B. J.;Kim H. K.
    • Transactions of Materials Processing
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    • v.14 no.3 s.75
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    • pp.207-214
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    • 2005
  • Blanking process is widely used fur producing various structural parts. However, fine blanking technology is frequently used as a single step blanking operation with clean cut surface of a sheared surface because the fractured surface of parts causes serious problems in the final product and therefore it must be removed by the post-processing in case of the conventional blanking. In the present investigation, a fine blanking process was designed within the framework of progressive die to produce a carrier plate assembled within the auto transmission. Finite element analysis of the shearing behavior at the respective stage of the progressive fine blanking was conducted to validate the designed die parameters. Finally the designed progressive fine blanking process was experimentally evaluated by using the machined die.

Application of the induction type furnace for HGL (용융아연도금라인(HGL)의 Induction Type Furnace 적용)

  • 이만식
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1999.08a
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    • pp.111-118
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    • 1999
  • This article describes the basic engineering concepts to be considered in the application of an induction heating furnace in the hot-dip galvanizing line. Experience in the Dongkuk project in Pohang, has shown that this arrangement has many advantages over the conventional method of using a combustion-gas heated furnace. Investment and operating costs are lower, the line length is much shorter, line operation is more convenient, air pollution is reduced, and the coated strip at of top-quality. As these benefits become well known, it is anticipated that the concept of induction heating will be more widely used in both new and revamped process lines. Induction heating is suitable for the production of Commercial Quality hot galvanized coils. More research is required to extend the present concept to the production of higher forming grades such as Drawing, Deep Drawing and Extra Deep Drawing Quality steels. A combination of induction heating and combustion-gas heating may lead to the way to the processing of these qualities of strip.

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Development and Evaluation of Turbulent Air Mixing Process for Manufacturing Wood Fiber and Thermoplastic Fiber Composites

  • Yoon, Hyoung-Un;Eom, Young-Geun;Park, Jong-Young;Kong, Young-To
    • Journal of the Korean Wood Science and Technology
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    • v.26 no.2
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    • pp.38-44
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    • 1998
  • A new device that uses turbulent air for mixing wood fibers with thermoplastic fibers was designed and its mixing effectiveness was evaluated in wood fiber and polypropylene fiber composites. Composites made by the turbulent air mixing (TAM) process performed better than composites made by the conventional Rando-Webber forming or nonwoven web process with an additional needling step. Thus, the TAM process proved to be a simple and efficient method in mixing wood fibers with short thermoplastic fibers for the production of wood fiber and thermoplastic fiber composites.

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