• Title/Summary/Keyword: Drawability

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A Study on the Formability Factors of Axisymmetric Multi-Stage Deep Drawing Processes (축대칭 다단계 딥드로잉 공정의 성형인자에 대한 연구)

  • 여은구;조선형;이용신
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2001.10a
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    • pp.280-285
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    • 2001
  • A good drawability of material itself is required. To improve the formability in deep drawing process. Besides that bending resistance should be reduced by increasing die round appropriately, drawing load should be minimized by improving the lubricant condition between die and material, and breaking load should be increased by selecting a pertinent punch round and by augmenting the friction resistance in Punch. In this study, a multi-stage deep drawing process is analyzed using ABAQUS, the effects of formability factors. Such as die shoulder radius, punch-die clearance and friction coefficient are investigated.

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Plastic Strain Ratio and Planar Anisotropy of AA5182/Polypropylene/AA5182 Sandwich Sheets (알루미늄 5182/폴리프로필렌/알루미늄 5182 샌드위치 판재의 소성변형비 및 평면이방성)

  • 김기주;정효태
    • Transactions of Materials Processing
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    • v.13 no.4
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    • pp.365-373
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    • 2004
  • The sheet formability of single AA5182 sheets and sandwich sheets comprising of AA5182/polypropylene/AA5182 (AA/PP/AA) was studied. Rolling without lubrication and subsequent recrystallization annealing led to the formation of favorable {111}//ND fiber textures in AA5182 sheets, which provided a higher plastic strain ratio of $R_m=1.5$. $R_m$ value of 1.58 was obtained in the AA/PP/Ah sandwich sheet sample. Furthermore, a proper combination of the sample direction of the upper and lower skin sheet gave rise to an optimization of the sheet formability of the sandwich sheets.

A Study on the Warm Deep Drawability of Sheets in Cr-Coated Die

  • Seo, Dae-Gyo;Lee, Jae-Dong;Heo, Young-Moo;Chang, Sung-Ho;Park, Yi-Chun;Kim, Heon-Young
    • Journal of Mechanical Science and Technology
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    • v.15 no.7
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    • pp.839-846
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    • 2001
  • Some deep drawing characteristics at elevated temperatures were investigated for the SCPI steel sheets by using a Cr-coated die. For this investigation, six different temperatures between room temperature and 250$\^{C}$, and six different drawing ratios ranging from 2.4 to 2.9 were considered. As a result, the limiting drawing ratio, the maximum drawing force and the maximum drawing depth were found to be affected sensitively by temperature, and more stable through-thickness strain distribution was observed at elevated temperatures. Some experimental results compared favorably with theoretical results obtained by using the finite element method.

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The Simulations on the Formability of AZ31 Magnesium Alloy Sheet in Warm Deep Drawing (AZ31 마그네슘합금판의 온간 디프드로잉 성형성해석)

  • Kang, Dae-Min;Hwang, Jong-Kwan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.3 no.1
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    • pp.52-58
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    • 2004
  • The material used is a commercial magnesium based alloy AZ31(Mg-3Al-1Zn)sheet with a thickness of 1.0mm. Uniaxial tension tests at warm temperature were carried out to investigate the material characteristics of K, m, and n. A warm drawing process with a local heating and cooling technique was developed to improve formability in this study with results of uniaxial tension tests because it is very difficult for Mg alloy to deform at room temperature by the conventional method. The die and blank holder were heated up, while the punch was water-cooled during deformation. FE simulations considering heat transfer were executed with Mg alloy to investigate the Improvement of deep drawability. For the assessment of improvement those were compare with the results of no considering heat transfer and room temperature.

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A Study of Selecting Material for Forming Analysis in Auto-Body Panel Stamping Process (차체판넬 스템핑공정에서 성형해석을 통한 재질선택에 관한 연구)

  • Hwang Jae Sin;Moon Won Sub;Lee Chan Ho;You Ho Young;Jung Dong Won
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.3 s.234
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    • pp.484-494
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    • 2005
  • Finite element method is very effective method to simulate the forming processes with good prediction of the deformation behaviour. For the finite element modeling of sheet mental forming the accurate tool model is required. Due to the geometrical complexity of real-size part stamping tools it is hard to make FE model for real-size auto-body stamping parts. In this paper, it was focussed on the drawability factors on auto-body panel stamping by AUTOFORM with using tool planing alloy to reduce law price as well as high precision from Design Optimization of die. According to this study, the results of simulation will give engineers good information to access the Design Optimization of die.

A Study of Cup forming by double Stretch-Drawing Process (원통의 2단 인장드로잉 성형에 관한 연구)

  • 김영수;정태훈;일본명
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2003.10a
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    • pp.406-411
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    • 2003
  • It is clearly demonstrated that deeper cups could be formed by single and double stretch-drawings from smaller circular blanks due to such wall-thinning action than in the usual deep-drawing of larger blanks. From this fact, it is emphasized that the deep-drawability of a sheet metal Is not evaluated simply by the conventional L.D.R (limiting drawing ratio), but the depth of the drawn cup should also be taken into account. Many experimental data about various metals and thicknesses given in this paper offer a valuable information in this process for more general use which recommends to replace the conventional deep-drawing process by the stretch-drawing process both for single and double operations. In the single stretch-drawing, it is also confirmed that a deeper cup can be produced by raising the blank-holding force at later stage of operation.

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Comparison of Warm Deep Drawability of Stainless Sheet Between Crank Press and Hydraulic Press (크랭크 프레스와 유압 프레스에서 스테인리스 강판의 온간 드로잉성 비교)

  • 김종호;최치수;나경환
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1995.03a
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    • pp.178-185
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    • 1995
  • Warm deep drawing for optimum forming conditions to give the maximum drawing depth is investigated and compared with the results at room temperature. Experiments which draw square cups of STS 304 stainless steel sheet under the constant lubrication condition of teflon film made both in a crank and hydrqulic press for two kinds of specimens . The maximum drawing depth at warm forming condition reaches 1.4 times the drawing depth at room temperature in a crank press, whereas 1.6 times in a hydrqulic press, and also more uniform distribution of thickness in case of warm deep drawn cup is observed. The effects of other factors on formability , such as forming temperature, speed of press and cooling of punch are examinnied and discussed.

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Controlled Cooling Technical of High Tensile Valve Spring Wire Rod (고강도 엔진밸브 스프링강 선재 저온조직 발생방지 선재압연 기술)

  • 김경원;장용권;임규환;서일권
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1999.08a
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    • pp.172-179
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    • 1999
  • As the martensite structure cause fracture failure during drawing from 5.5mm rod to 3.05mm dia. wire without additional heat treatment, the optium cooling condition to inhibit the occurrence of martensite was investigated. In order to get SAE9254+V quality, the effects of alloying element, vanadium on the mechanical properties were investigated. Based upon CCT and TTT curves and the results form cooling test in mill, optimun cooling was found in the condition of the laying head temp of 780$^{\circ}C$ and of the conveyor speed at 0.15m/sec with the whole cover closed. The wire rods produced under the condition showed the best mechanical properties of 120kg/$\textrm{mm}^2$ in TS and 50% in RA, having an excellent drawability. In vanadium added steels, tensile strength was improved without degrading elongation and charpy impact value. That means the strengthening by vanadium is mainly due to the grain refinement by the fine precipitates during tempering process.

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Comparison of Warm Deep Drawability of Stainless Steel Sheet Between Crank Press and Hydraulic Press (크랭크 프레스와 유압 프레스에서 스테인리스 강판의 온간 드로잉성 비교)

  • Kim, Jong-Ho;Choi, Chi-Soo;Na, Kyoung-Hoan
    • Transactions of Materials Processing
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    • v.4 no.4
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    • pp.345-352
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    • 1995
  • Warm deep drawing for optimum forming conditions to give the maximum drawing depth is investigated and compared with the results from experiments performed at room temperature. Experiments which draw square cups of STS 304 stainless steel sheet under the constant lubrication condition of teflon film are made both in a crank and hydraulic press for two kinds of specimens. The maximum drawing depth at warm forming condition reaches 1.4 times the drawing depth at room temperature in a crank press, whereas 1.6 times in a hydraulic press, and also more uniform distribution of thickness in case of warm deep drawn cup is observed. The effects of other factors on formability, such as forming temperature, speed of press and cooling of punch are examined and discussed.

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A Study of tool planning for forming analysis in REE SILL OTR-R/L Auto-Body Panel stamping process (REF SILL OTR-R/L 차체판넬 스템핑 공정에서 성형해석을 통한 공법개발에 관한 연구)

  • Hwang J. S.;Jung D. W.;Ahn B. I.;Mun W. S.;Park Y. G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2004.10a
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    • pp.138-141
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    • 2004
  • Finite element method is very effective method to simulate the forming processes with good prediction of the deformation behaviour. For the finite element modeling of sheet mental forming the accurate tool model is required. Due to the geometrical complexity of real-size part stamping tools it is hard to make FE model for real-size auto-body stamping parts. In this paper, it was focussed on the drawability factors on auto-body panel stamping by AUTOFORM with using tool planing alloy to reduce law price as well as high precision from Design Optimization of die. According to this study, the results of simulation will give engineers good information to access the Design Optimization of die.

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