• Title/Summary/Keyword: 서브프레스 다이

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Development of Fine Blanking Die with Fluid Chamber and its Application to Procuction of Circular Blanks in a Hydraulic Press (간이 파인 블랭킹 금형의 개발을 통한 범용 유압 프레스에서의 원형 정밀진단 가공성 연구)

  • Kim, J.H.;Ryu, J.G.;Chung, W.J.
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.5
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    • pp.157-163
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    • 1996
  • This paper is concered on the development of low-cost fine blanking die with two fluid chambers of which the pressure can be controlled by a hydraulic unit and its application to producting circular blanks in a conventional hydraulic press, not in a special triple-action press usually adopte in fine blanking operation. Four important working parameters affecting on the precision accuracy of products such as existence and position of Vee-ring, stripping force and counter punching force are primarily considered for experiments. Finite element analysis by suing ABAQUA software is approxi- mately made for blanking of circular specimen with a flat stripper plate and then compared with experimental measurements. The the theoretical prediction of camber height which represents deflection of a dish-shaped specimen after blanking seems to give a qualitatively good agreement. It is shown through experiments the the camber height decreases with decreasing stripping force and also with increasing counter punching force, but particularly depending on the latter much more than the former.

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Hydro-forming Process Control and Design Concept of Automotive Rear Sub-frame Components Through Cross Sectional Analysis (단면 분석을 통한 자동차용 리어 서브-프레임 하이드로포밍 부품의 공정 제어 및 설계)

  • Kim, Kee Joo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.9
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    • pp.1-6
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    • 2018
  • Hydro-forming technology has spread dramatically throughout automotive industry over the last 20 years. This technology has many advantages for automotive applications in terms of better structural integrity of the parts, lower cost from fewer parts, material savings, weight reduction, lower springback, improved strength, durability, and design flexibility. In this study, various simulation technologies were developed to investigate the formability of hydro-forming components. Through this technology, to establish the effective forming process for appropriate components design, the bending process, pre-forming process, die closing process, etc. were considered for good forming. This paper proposes the forming amount, section length (corresponding to the hydro-forming press capacity), and minimum curvature (curvature effect evaluation according to the hydro-forming pressure) among the considerations in the design of the hydro-forming part. In addition, a design method is proposed for hydro-forming molding by carrying out cross section analysis of a real sub-frame part for automobiles. The effects of pre-bending, axial feed, hydraulic pressure, press load, and friction among the hydro-forming process parameters were analyzed. Therefore, whether these processes are necessary factors for hydro-forming were examined.