• Title/Summary/Keyword: Dome Die

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A Study on Micro Hole Punching with Soft Die Plate (소프트 다이 플레이트를 이용한 미세 구멍 펀칭 연구)

  • Yoo J. H.;Joo B. Y.;Jeon B. H.;Oh S. I.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2002.02a
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    • pp.260-265
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    • 2002
  • In micro hole punching process, it is very difficult to align punch with die hole. Misalignment can cause a falling-on in hole quality and breakage of punch and die. Micro punching using soft die plate without a die hole has a big advantage because it is not necessary to align punch with die hole and to consider die clearance. Soft die plates are made by polymers or hard rubbers which are softer than metals. In this study, several micro punching experiments are conducted. Micro punching test with some materials shows that micro hole punching is feasible with some soft die plates. Through the section shape obtained by mounting and polishing, the punched hole quality is measured and the shapes of burr and dome we studied.

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A study on the forming analysis of double-dome model considering CFRP prepreg laminate condition and coefficient of friction (CFRP Prepreg 적층조건과 금형 마찰계수를 고려한 Double-dome 형상 성형해석 연구)

  • Kim, Young-Ju;Lee, San-Ho;Kim, Heung-Kyu
    • Design & Manufacturing
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    • v.10 no.2
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    • pp.12-17
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    • 2016
  • Recently, lightweight material is attracting attention as a solution to the problem of fuel efficiency and increasing the need for development. CFRP has been attracting attention as lightweight materials for automobile because it has a high specific stiffness and specific strength compared to steel material. CFRP have a wide range of mechanical properties depending on the laminate condition. In this paper, study on the forming analysis of double-dome model was performed considering CFRP prepreg laminate condition and coefficient of friction. After forming analysis, the result has compared with wrinkling area and vertical strain of fiber to the laminated condition. And then compared with inflow of blank to the laminate condition. Through this paper, we propose the forming analysis methods of CFRP material.

FE Analysis on Doming & Necking Process of Steel D&I Can (Steel D&I Can의 Doming 및 Necking 공정의 FEM 해석)

  • Jung, S.W.;Nam, J.B.;You, C.S.;Jin, Y.S.;Han, K.S.
    • Proceedings of the KSME Conference
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    • 2000.11a
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    • pp.452-457
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    • 2000
  • The object of this study is to develop a reliable FEM simulation technique for the analysis of can making process using PAM-STAMP software. The processes consist of doming and necking in addition to drawing, redrawing. After body making process, this study analyzed the stability for internal pressure by simulating buckling test. Through these technique, we estimated the dome reversal pressure of steel D&I Can for various can profile and process conditions. From this study, we found the cause and mechanism of wrinkling during necking process. This mechanism is largely affected by can wall thickness and the clearance between knock out punch and necking die. The dome reversal pressure improves with increasing dome depth. These results validate the usefulness of the developed simulation technique for the analysis of body making process and optimization of the dome profile.

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An Experimental Study on Forming an Axi-Symmetric Dome Type Closed-Die Forging Product Using Modeling Material(I) (모델링재료를 이용한 축대칭형 돔형상의 폐쇄단조 성형 연구 (I))

  • 이근안;임용택;이종수;홍성석
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.11
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    • pp.2082-2089
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    • 1992
  • An experimental study on forging an axi-symmetric dome type of AISI4130 was carried out using modeling material. In order to verify the validity of the experimental data, a similarity study between plasticine and AISI4130 has been made. Friction conditions were characterized by ring test for the various lubricants. For the closed-die forging experiments of an axi-symmetric dome type of AISI4130 using the plasticine, various cylindrical billets with different aspect ratios were forged and different flash width to thickness(W/T) ratios were used in order to determine the optimum forging conditions. As W/T ratios decrease forging loads decrease while excess volumes increase. It was found out that the experimental results reproduce the similiar results available in the literature. As a result of these experiments, it was construed physical modeling is an excellent tool for forging process simulation at a practical level.

Analysis of Void Closure in the Upsetting Process of Large-Ingot (대형강괴 업셋팅공정의 기공압착 해석)

  • 박치용;조종래;양동열;김동진;박일수
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.10
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    • pp.1877-1889
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    • 1992
  • Upsetting is performed in open-die press forging to deform metal in all directions in order to enhance soundness of a product and reduce directionality of properties caused by casting. It is necessary to ensure sufficient forging ratio for subsequent cogging operations and consolidate the void along the centerline. To obtain these benefits, the upper die shape (dome and dished shape) is considered as an upsetting parameter. Thermo-viscoplastic finite element analysis has been carried out so as to understand the influence of upper die shape on the effective strain, hydrostatic stress and temperature in the upset-forged ingots without internal defects. The analysis is focused on the investigation into internal void closure in ingots with pipe holes and circular voids. The computational results have shown that the volume fraction of the void is independent of the circular void size and the closure of internal voids is much more influenced by the effective strain than the hydrostatic stress around the void. It is finally suggested that the height reduction must be over 35% for consolidation of internal voids.

A study on the molding of dome shaped plastic parts embedded with electronic circuits (전자회로 일체형 돔 형상의 플라스틱 부품 성형에 관한 연구)

  • Seong, Gyeom-Son;Lee, Ho-Sang
    • Design & Manufacturing
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    • v.14 no.1
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    • pp.15-21
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    • 2020
  • Smart systems in different application areas such as automotive, medical and consumer electronics require a novel manufacturing method of electronic, optical and mechanical functions into products. Traditional methods including mechanical assembly, bonding of plastic and electronic circuit cause the problems in large size of products and complicated manufacturing processes. In this study, thermoforming and film insert molding were applied to fabricate a dome shaped plastic part embedded with electronic circuits. The deformation of patterns printed on PET film was predicted by thermoforming simulation using T-SIM, and the results were compared with those by experiment. In order to decrease spring-back after thermoforming, the Taguchi method of design of experiment was used. Through ANOVA analysis, it was found that mold temperature was the most dominant parameter for spring-back. By using flow analysis, gate design was performed to decrease injection pressure. During film insert molding, the wash-out of ink printed on film occurred for Polycarbonate. When the resin was changed to PMMA, the wash-out disappeared due to low melt temperature.

Effects of Process Parameters owl the Tube Hydroformability (하이드로포밍 성형성에 미치는 공정인자 영향도 해석)

  • 김봉준;김정운;문영훈
    • Transactions of Materials Processing
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    • v.11 no.1
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    • pp.54-60
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    • 2002
  • The purpose of the present paper is to investigate the effect of Process parameters such as internal pressure, amount of axial feeding, and frictional condition between the die and the material on the tube hydro-formability. For carbon steel tubes(STKM 12A, STBH 410 and SPS 290), simple bulging, circular bulging and Tee-fitting tests are performed to evaluate the hydro-formability of these materials which is determined by deformation characteristics such as thickness distribution, forming height and branch dome shape. The formabilities obtained from these tests are analysed and compared with the results of the numerical simulation.

Springback Control in the Forming Processes for High-Strength Steel Sheets (고강도 강판 성형 공정의 스프링백 제어)

  • 양우열;이승열;금영탁;황진영;윤치상;신철수;조원석
    • Transactions of Materials Processing
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    • v.12 no.8
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    • pp.718-723
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    • 2003
  • Tn order to develop springback control technology for high-strength steel sheets, several studies have been conducted: dome stretching test, stepped s-rail forming and springback measurement, and optimally shaped initial blank design. First, to find out the formability of TRIP60, dome stretching test was performed. Next, the stepped s-rail die, which was designed to form a channel type panel with large twist and wall curl, was manufactured and used to evaluate the effect of controlling forming variables, such as blank holding force and flange amount on the springback. Furthermore, new measurement method of the springback was introduced to define wall curl and twist in geometrically complex panels. Finally, the optimally shaped initial blank was employed to verify one of the best ways to control the springback in channel type. high-strength sheet panels.

Forming Limit of AZ31B Magnesium Alloy Sheet in the Deep Drawing with Cross Shaped Die (십자 형상 금형의 디프 드로잉에서 AZ31B 마그네슘 합금판재의 성형 한계)

  • Hwang, S.H.;Choi, S.C.;Kim, H.Y.;Kim, H.J.;Hong, S.M.;Shin, Y.S.;Lee, G.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.05a
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    • pp.374-377
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    • 2008
  • Magnesium alloy sheets are usually formed at temperatures between $150^{\circ}C$and $300^{\circ}C$ because of their poor formability at room temperature. In the present study, the formability of AZ31B magnesium alloy sheets was investigated by the analytical and experimental approaches. First, tensile tests and the limit dome height test were carried out at elevated temperatures to get the mechanical properties and forming limit diagram, respectively. And then deep drawing of cross shaped die was tried to get the minimum corner radius and forming limit at specific temperature. Blank shape, punch velocity, minimum corner radius, fillet size, etc, were determined by finite element analysis physical try-outs. Especially, optimum punch and die temperature were suggested through the temperature-deformation analysis using Pam-stamp.

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