• Title, Summary, Keyword: Forging

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A Study on the Forming Technologies for a Motor Piston and Improvement of Mechanical Properties (자동차용 피스톤의 성형기술과 기계적 성질의 개선에 관한 연구)

  • 김길준;박종옥;김영호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.842-845
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    • 2000
  • The purpose of this paper is to investigate the influences on mechanical properties of motor pistons manufactured by casting, conventional forging and powder forging, using the comparison of characteristics like microstructure, hardness, tensile strength, and elongation. To form conventional forging piston, the experiment of visioplasticity was performed. As the model material, plasticine was used. To form powder forging piston, the shape of piston was simplified as simple cup shape. Material properties like workability, density variation before and after forging, and strain loci of material during forging were investigated. Powder forging and conventional forging technologies were effective to gain dense microstructure. In powder forging, distribution of such dense microstructuer was uniform. For hardness, pistons from powder forging and conventional forging technologies were much better than that from casting. For tensile strength and elongation, powder forging and conventional forging technologies were also advantageous.

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DEVELOPMENT OF A VIRTUAL FORGING FACTORY FRAMEWORK

  • Kao Yung-Chou;Sung Wen-Hsu;Huang Wei-Shin
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.115-122
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    • 2003
  • This paper presents the development of a virtual forging factory framework. The technologies of virtual reality and relational database had been integrated in the developed framework using Microsoft $Windows^{(R)}$ programming as the main technique so as to emulate a physical forging factory. The developed virtual forging factory consists of forging cells and a forging cell is comprised of forging machine, forging die, and forging operations forming a forging production line. The technology of virtual reality had been successfully adopted in the production simulation of manufacturing such as CNC and robotics. However, the application in virtual forging factory seems to have not been studied yet. Potential application of a virtual forging factory can be beneficial to (1) computer aided instruction, (2) shorten the learning curve of a novice, (3) remote diagnosis and monitoring when remote monitoring and control technology and signal inspection is considered, (4) improve adverse forging environment when remote forging technology is applied, and (5) virtual reality application.

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Automatic Design of Hot Forging (열간단조의 자동설계)

  • 김대영;박종진
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.171-174
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    • 1997
  • In this study, a computer program was developed which generates automatically a drawing of the forging design in axisymmetric hot-forging of steel. The program designs a forging envelope from a machined part geometry according to forging design rules: parting line, draft angles, fillet and corner radii, minimum web and rib thicknesses. For the purpose of verification, the program was applied to a machined part from a factory. It was found that the generate forging design agreed well with the actual one used in the factory.

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A Study on the Computer-Aided Forging Design for Rib/Web Shaped Parts (리브/웨브 형상을 갖는 부품의 단조품설계 자동화에 관한 연구)

  • 최재찬;김병민;이언호
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.3
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    • pp.768-776
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    • 1994
  • This paper describes computer-aided forging design for rib/web shaped parts. In manufacturing a part by means of forging process, the first step is to design the forging. This is done by modifying the given machined part geometry according to the requirements of the forging process. Traditionally, this is done by experienced forging designers using empirical forging design guidelines. Generally, it would be neither possible nor practical to develop a system which encompasses the design of all types of forgings. Accordingly, forging design can be simplified by considering critical two dimensional cross sections of the machined part geometry. This system is composed of three modules(process variable decision module, forging design module and redesign module) and each module is carried out in regular sequence. In the process variable decision module, first of all, the undercut is checked and modified, and then deep recesses and holes difficult to forge are eliminated. Also parting line, forging plane, forging plan view area, forging weight and maximum size(maximum height or width)are determined. In the forging design module, the magnitude of various allowances, draft angle, minimum web thickness, corner and fillet radius are determined and then geometry modification is performed. Finally, since the design rules and databases used in this system are based on parameters of the forging geometry, such as the trimmed forging plan area, forging weight, forging maxmum size, plausible estimates need to be made for these parameters. Therefore, in the re-design module, the design process is iterated until a satisfactory forging is obtained.

Precision Cold Forging of Spur Gear Using the Alloy Steel (합금강을 이용한 스퍼기어의 정밀 냉간 단조)

  • Choi, J.C.;Choi, Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.172-175
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    • 1997
  • The conventional closed-die forgings had been applied to the forging of spur gears. But the forgings require high forging-pressure. In this paper, new precision forging technology have been developed. The developed technology is two steps forging process. Good shaped products are forged successfully with lower forging-pressure than those of conventional forging

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Effect of Forging Condition on the Microstructure and Mechanical Properties in Centrifugal Casted Heat Resistant Steel (원심주조된 내열강의 미세조직 및 기계적성질에 미치는 단조 조건의 영향)

  • Kang, C.Y.;Lee, S.M.;Jo, D.H.;Park, Y.T.;Lee, D.H.;Kim, Y.C.
    • Journal of Power System Engineering
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    • v.13 no.3
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    • pp.47-52
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    • 2009
  • The effect of forging start temperature, forging ratio on the microstructure and mechanical properties of B7B4 steel ware investigated. Microstructure of centrifugal casted B7B4 steel consisted of martensite and ferrite phase. The volume fraction of ferrite increased with increase of forging start temperature and decreased with increase of forging ratio. Tensile strength and hardness decreased with higher of forging start temperature, while impact value and elongation increased with higher of forging start temperature. With increase of forging ratio, tensile strength rapidly increased up to the forging ratio of 30%, and then slowly increased, but elongation was decreased. Hardness and impact value rapidly increased with increase of forging ratio.

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A Study on the Cold Forging Process of Spur Gears (스퍼어 기어의 냉간 단조 공정에 관한 연구)

  • Park, J.C.;Park, Y.;Kim, K.K.
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.12
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    • pp.105-113
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    • 1997
  • In this study, the forging process of spur gears has been investigated. The forging process of spur gears has been classified into two type of operations, guiding one and clamping one in this investigation. Two type forgings of spur gears have been analysed by using upper bound method. The predicted values of the forging load were compared with those obtained from the forging experiments. The forging experiments were carried out with a commercial aluminium alloy. The forged parts obtained through the guiding type forging were campared with those obtained through the clamping type forging.

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Closed-Die Forging Analysis of Spling-LikeComponents (스플라인 기어류의 폐쇄단조 해석)

  • Lee, Seung-Dong;Kim, Won-Il;Kim, Yohng-Jo
    • Journal of the Korean Society of Industry Convergence
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    • v.2 no.2
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    • pp.187-194
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    • 1999
  • Closed-die forging of spline was analysed using the upper bound elemental technique, Two different forging methods, denoted here as side extrusion-forging and upset forging, were proposed, The kinematically admissible velocity fields for each of the forging methods, which could express trapezoidal, rectangular and serration tooth forms, were presented. Upper bounds to forging loads and deformed configurations were predicted using the velocity fields. Theoretical results were compared with experimental ones. Experiments with lead were carried out at room temperature where grease was used as a lubricant. The present investigation revealed that analytical forging loads were reduced by using the side extrusion-forging but the upset forging could improve configuration of the final forged splines.

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A Study on Die Forging of a Hollow T-shaped Part (중공 T형상의 형단조에 관한 연구)

  • 김현수;김용조
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.1
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    • pp.32-39
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    • 2004
  • Traditional forging of a hollow T-shaped part has been applied to forge a solid T-shaped product from a solid billet and then to machine the hollow in that. In a case, a hollow T-shaped part can be forged by backward-extruding from a solid billet. In this study, four types of forging were suggested for manufacture of hollow T-shaped parts. Forging simulations for each of these forging methods were carried out to investigate folding defect, metal flow pattern, effective strain, and forging loads. Experimental works were carried out to be compared with the simulation results. Here, the ratio of the thickness of the hollow tube to that of the flange was selected to investigate a forging defect like folding.

Comparative Study on Pore Closing in Open Die Forging by Conventional Forging Press and Radial Forging Machine (일반자유단조 프레스와 방사형 단조 프레스의 기공 압착에 관한 비교 연구)

  • Kim, S.H.;Lee, M.C.;Jang, S.M.;Eom, J.G.;Joun, M.S.
    • Transactions of Materials Processing
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    • v.19 no.7
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    • pp.399-404
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    • 2010
  • We propose an analysis model for simulating the detailed procedure of pore closing in open die forging of shafts. In the analysis model, an artificial symmetric plane is used, on which initial pores are located to be traced. The analysis model is employed to carry out three-dimensional simulation of pore closing in shaft free forging by both conventional free forging press and radial forging machine. With this result, two typical types of free forging equipment for manufacture of shafts are compared in detail. It has shown that the radial forging machine is much superior to the conventional open die forging press especially in pore closing under high hydrostatic pressure with sound strain.