• 제목/요약/키워드: One-Stage Cup Drawing

검색결과 8건 처리시간 0.024초

원형컵 드로잉의 공정설계 변화가 제품품질에 미치는 영향 (Influence of Process Design Scheme on Product Qualities in Cylindrical Cup Drawing)

  • 이재명;김종호;원시태
    • 소성∙가공
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    • 제11권8호
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    • pp.716-723
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    • 2002
  • A systematic investigation for the process design in deep drawing is necessary to improve the quality of drawn cups. This study concentrates mainly on the influence of process desing scheme on the product qualities in cylindrical cup drawing. Three types of process design scheme were chosen in this study. Case 1 is to draw a finished cup of 50mm in diameter in one stage, Case 2 and Case 3 are redrawing the first drawn cups of 55, 65mm in diameter to the final size respectively. Through experiments the maximum drawing force in two-stage cup drawing can be reduced up to 24% as compared with that of one-stage cup drawing. In addition, Case 3 process results in better product qualities than the other two processes in terms of the distributions of thickness and hardness.

원형컵 드로잉의 공정설계 변화에 따른 제품품질에 미치는 영향 (Influence of Process Design Scheme on Product Qualities in Cylindrical Cup Drawing)

  • 이재명;이상민;최영윤;류호연;김종호
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2002년도 춘계학술대회 논문집
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    • pp.82-85
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    • 2002
  • A systematic investigation for process design in deep drawing is necessary for quality improvement of drawn cups. This study has been concentrated mainly on the influence of process design scheme on product qualities in cylindrical cup drawing. Three types of process design scheme were chosen in this study. That is, Case 1 is to finish drawing a cup of 50m in diameter in one stage, Case 2 and Case 3 are redrawing the drawn cups of 55, 65 mm in diameter to the final size respectively. Though experiments the maximum drawing force in two-stage cup drawing could be reduced up to 35% as compared with that of one-stage cup drawing. In addition, the Case 2 and Case 3 processes showed better product qualities than the Case 1 process when comparing distributions of thickness, hardness, dimensional accuracy.

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국소 가열 방법을 이용한 2단계 축대칭 디프 드로잉 공정의 해석 및 설계 (Finite Element Analysis Design of Axisymmetric Deep Drawing Process by Local Heating)

  • 이동우;송인섭;양동열
    • 한국정밀공학회지
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    • 제10권3호
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    • pp.198-204
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    • 1993
  • The study is concerned with finite element analysis and design of axisymmetric deep drawing by local heating. When the bottom shape of a cup is not flat but in complex-shaped, i.e., hemispherical, the cup cannot be drawn in one or two processes in the conventional deep drawing process and the limit drawing ratio is limited as well. By introducing local heating selectively with regards to the heating position, the formability of the sheet metal can be greatly increased with the reduced number of processes. In the Process analysisthe rigid- viscoplastic finite element method is employed and the temperature effect is incorporated. Bishop's step-wise decoupled method is employed to analyze the thermomechanical interaction between deformation and heat transfer. Axisymmetric deep drawing of a hemisphere-bottomed cup has been analyzed for various combinations of heat application in the punch and the die. At the first stage of deep drawing stretch forming is practically carried out by firmly pressing the blankholder with the punch and the die heated at various levels of temperature. Then at the second stage the same cup is drawn for the saame or different combination of temperature. From the computation, it has thus been shown that the fromability of a cup is greatly increased in two-stage deep drawing with increased limet drawing ratio.

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유한요소해석을 이용한 세장비가 큰 직사각컵 다단계 디프 드로잉-아이어닝 공정의 최적 금형설계 (Optimum Tool Design in a Multi-stage Rectangular Cup Drawing and Ironing Process with the Large Aspect Ratio by the Finite Element Analysis)

  • 김세호;김승호;허훈
    • 대한기계학회논문집A
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    • 제26권6호
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    • pp.1077-1084
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    • 2002
  • Optimum tool design is carried out fur a multi-stage rectangular cup deep-drawing and ironing process with the large aspect ratio. Finite element simulation is carried out to investigate deformation mechanisms with the initial design made by an expert. The analysis considers the deep drawing process with ironing for the thickness control in the cup wall. The analysis reveals that the difference of the drawing ratio within the cross section and the irregular contact condition produce non-uniform metal flow to cause wrinkling and severe extension. For remedy, the modification guideline is proposed in the design of the tool and the process. Analysis results confirm that the modified tool design not only improves the quality of a deep-drawn product but also reduces the possibility of failure. The numerical result shows fair coincidence with the experimental one. After tryouts of the tool shape, the rectangular cup has been produced in the transfer press.

유한요소해석을 이용한 세장비가 큰 직사각컵 다단계 성형공정의 금형설계 - 아이어닝 해석과 실험적 검증 (Tool Design in a Multi-stage Rectangular Cup Drawing Process with the Large Aspect Ratio by the Finite Element Analysis - Ironing Analysis and Experimental Verifications)

  • 김세호;김승호;허훈
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2001년도 춘계학술대회 논문집
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    • pp.85-88
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    • 2001
  • Examination of the die design is carried out for a multi-stage rectangular cup drawing process with the large aspect ratio with the aid of the finite element analysis. The analysis considers the deep drawing process with the ironing process for the thickness control in the cup wall. Simulation is performed to investigate the deformation mechanism in the initial design and the modified design. The analysis clarifies that the irregular cross section and the irregular contact condition produces unfavorable deformation. The analysis results show that the modified design improves the quality of a deep-drawn product with the low possibility of failure. The analysis result also shows good agreement with the experimental one.

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원형컵 디프 드로잉의 성형해석에 의한 공정설계 (New Design of Cylindrical Cup Deep Drawing by Forming Analysis)

  • 정완진;김종호;류제구
    • 소성∙가공
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    • 제12권7호
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    • pp.647-653
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    • 2003
  • A systematic approach for the process design in deep drawing is necessary to improve the quality of drawn cups. This study concentrates mainly on the influence of process design strategy on the product quality. Different types of process design were chosen from initial blank of 100mm in diameter to make final cup of 50mm in diameter. In order to make this cup, we used 2-stage deep drawing. Forming analyses are carried out to find out better design in terms of drawing force. It is proposed that the process design, in which maximum drawing forces during successive operations are equal, is a more desirable one. Through experiment, it is found that the proposed case shows equivalent values in terms of maximum drawing force during successive operations in real process and can achieve the best product quality in terms of dimensional accuracy. Thus, it is shown that proposed design is very effective in the improvement of quality in drawn cups and may be extended to deep drawing with more stages.

알루미늄 판재의 다단계 드로잉에 있어서 원통컵의 치수 정밀도 비교 (Dimensional Accuracy of Cylindrical Cups in Multi-Stage Drawing of Aluminum Sheet Metal)

  • 최종민;김종호
    • 소성∙가공
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    • 제24권2호
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    • pp.115-120
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    • 2015
  • Deep drawing of cylindrical cups is one of the most fundamental and important processes in sheet metal forming. Circular cups are widely used in industrial fields such as automobile and electronic appliances. Some of these cups are formed by a one-stage process, others such as battery cases and beverage cans are made by a multi-stage process. In the current study the multi-stage deep drawing of aluminum sheet metal is examined. The process consists of two deep drawing operations followed by two ironing operations. The press die, which can be used for the four-stage forming process, was manufactured allowing punch and die components to be easily changed for various experiments. The rolling direction of both the sheet and the drawn cups was always positioned toward the horizontal x-direction on the die face to minimize experimental errors during the progressive forming. The dimensional accuracy of the cylindrical cups formed at each stage and the earing defect due to the anisotropy of sheet were investigated. The influence of anisotropy on the thickness distribution was also examined. Both the thickness and the outer diameter of the cups were measured and compared for each set of experimental conditions. It was found that the dimensional accuracy of cups rapidly improves by employing the ironing process and also by increasing the amount of ironing.

직사각 컵 성형을 위한 다단 디프드로잉 공정의 실험적 연구 (Experimental Study on Non-Axisymmetric Rectangular Cup using Multi-Stage Deep Drawing Process)

  • 구태완;박중원;허성찬;강범수
    • 소성∙가공
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    • 제19권4호
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    • pp.253-262
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    • 2010
  • For multi-stage deep drawing process including ironing operation and biaxial forming in this study, tool developments are achieved, and the developed tool sets are applied to experimental investigations. In process and tool designs, a contact condition between intermediate blank and lower die is considered as the sequential one. In this study, the material used is cold-rolled thin sheet (SPCE) with the initial thickness of 0.4mm. From the experimental approaches, several failures such as tearing, localized thickening and thinning, are observed. To solve these failures, the contact surface on the lower die is modified. As the experimental results by applying the modified lower die, it is investigated that the failures are not occurred, and the excessive deformation behavior due to the thinning and thickening effects are decreased. Furthermore, the thickness distributions on the major axis and the minor axis of each intermediate blank are investigated to be already satisfied the target (ironing) thickness, respectively. By this systematic approach, it is confirmed that the experimental results show good agreements with the designed and required configuration of each deformed and final products.