• Title/Summary/Keyword: Relative Drawing Depth

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Finite Element Analysis and Experimental Investigation of Non-isothermal Foming Processes for Aluminum-Alloy Sheet Metals(Part 1. Experiment) (알루미늄 합금박판 비등온 성형공정의 유한요소해석 및 실험적 연구 (제1부. 실험))

  • 류호연;김영은;김종호;구본영;금영탁
    • Transactions of Materials Processing
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    • v.8 no.2
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    • pp.152-159
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    • 1999
  • This study is to investigate the effects of warm deep drawing with aluminum sheets of A1050-H16 and A5020-H32 for improving deep drawability. Experiments for producing circular cups and square cups were carried out for various working conditions, such as forming temperature and blank shapes. The limit drawing ratio(LDR) of 2.63 in warm deep drawing of circular cups in case of A5020-H32 sheet, whereas LDR of 2.25 in case of A1050-H16, could be obtained and the former was 1.4 times higher than the value at room temperature. The maximum relative drawing depth for square cups of A5020-H32 material was also about 1.92 times deeper than the depth drawn at room temperature. The effects of blank shape and forming temperature on drawability as well as thickness distribution of drawn cups were examined and discussed.

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Finite Element Analysis and Experimental Investigation of Non-isothermal Forming Processes for Aluminum-Alloy Sheet Metals. (Part 1. Experiment) (알루미늄 합금박판 비등온 성형공정의 유한요소해석 및 실험적 연구(제1부. 실험))

  • 류호연;배원택;김종호;김성민;구본영;금영탁
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1998.03a
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    • pp.45-52
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    • 1998
  • This study is to investigate the effects of warm deep drawing with aluminum sheets of A1050-H16 and A5052-H32 for improving deep drawability. Experiments for procucing circular cups and square cups were carried out for various working conditions, such as forming temperature and blank shape. The limit drawing ratio(LDR) of 2.63 in warm deep drawing of circular cups in case of A5052-H32 sheet, whereas LDR of A1050-H16 is 2.25, could be obtained and the former was 8 times higher than the value at room temperature. The maximum relative drawing depth for square cups of A5052-H32 material was also about 2 times deeper than the depth drawn at room temperature. The effects of blank shape, and temperature on drawability of aluminum materials as well as thickness distribution of drawn cups were examined and discussed.

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Improvement of Square Cup Drawability of Clad Sheet Metal by Warm Forming Technique (온간성형법에 의한 클래드 강판재의 정사각컵 드로잉성 향상에 관한 연구)

  • 류호연;김영은;김종호
    • Transactions of Materials Processing
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    • v.10 no.3
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    • pp.253-260
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    • 2001
  • This study was performed to investigate the optimized warm forming conditions which gave the maximum drawing depth in square cup drawing of clad sheet metals, by changing the temperatures of die and blankholder and also shapes and materials of blanks. Two kinds of clad sheet metals, STS304-A1050-STS304 and STS304-A1050-STS430 were selected for experiments. The relative drawing depth of STS304-A1050-STS304 clad sheet was increased up to 4.4 at $150^{\circ}C$ that was 29% higher than at room temperature, whereas STS304-A1050-STS430 material was improved to 3.9 at $120^{\circ}C$ which was 15% better than at room temperature. In addition, comparison of wall thickness and hardness of a warm drawn cup with those of room temperature showed more even distributions. No separation between each laminated material after drawing occurred through inspection by microscope as well as application of penetrant test and bond strength test. Therefore, warm forming technique was confirmed to give better results in deep drawing of stainless clad sheet metal.

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A Study on the Drawability of Clad Sheet Metal (STS304-A1050-STS304) by Warm Draw Die (온간금형에 의한 클래드판재(STS304-A1050-STS304)의 드로잉성 연구)

  • Ryu H. Y.;Kim J. H.;Ryu J. G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2002.02a
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    • pp.136-143
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    • 2002
  • Warm draw die technique which is one of the new forming technologies to improve formability of sheet metal is applied to the cylindrical and square cup drawing of stainless-aluminum clad sheets. In experiments the temperature of die and blank holder is varied from room temperature to $180^{\circ}C$, while the punch is cooled by circulation of coolant to increase the fracture strength of workpiece on the punch comer area. Test materials chosen for experiments are STS304-A1050-STS304 clad sheets. Teflon film as a lubricant is used on both sides of a workpiece. The limit drawing ratio and relative drawing depth as well as quality of drawn cups(distribution of thickness)are investigated and validity of warm drawing process is also discussed. No separation between each laminated material after drawing occurred through inspection by microscope as well as application of penetrant remover and bond strength test. Therefore, warm forming technique was confirmed to give better results in deep drawing of stainless clad sheet metal.

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Comparision of Warm Deep Drawability of Square Cups Using Circular Clad Sheet Metals (원형 클래드 판재를 이용한 정사각컵 온간 디프 드로잉성 비교)

  • Ryu H. Y.;Kim Y. E.;Kim J. H.;Chung W. J.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2001.05a
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    • pp.89-93
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    • 2001
  • This study was carried out to investigate the warm deep drawability of square cups of clad sheet metals, by changing temperatures of die and blankholder and blank materials. Two kinds of clad sheet metals, STS304-A1050-STS304 and STS304-A1050-STS430 were chosen for experiments. The relative drawing depth of STS304-A1050-STS304 clad sheet was increased up to 4.4 at $150^{\circ}C$ that was $29\%$ higher than at room temperature, whereas STS304-A1050-STS430 material was improved to 3.65 at $120^{\circ}C$ which was $16\%$ better than at room temperature. In addition, comparison of wall thickness and hardness of a warm drawn cup with those of room temperature showed more even distributions. Therefore, warm forming technique was confirmed to ive better results in deep drawing of stainless clad sheet metal.

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A study on the factors influencing at corner area material thickness changes of rectangular drawing products (각통드로잉 제품의 모서리 재료두께 변화에 영향을 미치는 인자에 대한 해석 연구)

  • Yun, Jae-Woong;Cho, Sang-Hee;Lee, Chun-Kyu
    • Design & Manufacturing
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    • v.14 no.1
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    • pp.22-29
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    • 2020
  • The analysis was carried out using the press molding analysis program by applying six parameters such as material type change, material thickness, friction coefficient, rp, rd and blank holder pressure. As a result of CAE analysis of the soft material DC04 and the relatively hard material HX300LAD, the thickness of the punch R part of the soft material was significantly reduced. The flange portion is greatly increased in thickness in the hard material by the compression action. As a result of considering the deformation amount of 0.6mm, 1.0mm, 1.5mm according to the material thickness, the influence of the thickness is considered to be very small. In case of the material thickness of 0.6mm, the rate of change increases due to the deep drawing depth relative to the material thickness. The sizes of the punches R and die R have the greatest influence on the change in thickness of the material in drawing molding, the smaller the punch R, the thinner the edges of the product, The larger the R of the die, the greater the material thickness of the flange portion. As the coefficient of friction and the blank holder pressure increase, the frictional force of the flange portion increases, which increases the radial force in the drawing process and increases the thickness change of the flange portion.

Three-dimensional Digital Restoration and Surface Depth Modeling for Shape Analysis of Stone Cultural Heritage: Haeundae Stone Inscription (석조문화유산의 형상분석을 위한 3차원 디지털복원과 표면심도 모델링:해운대 석각을 중심으로)

  • Jo, Young-Hoon;Lee, Chan-Hee
    • Journal of Conservation Science
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    • v.28 no.1
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    • pp.87-94
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    • 2012
  • This study was focused on digital restoration and surface depth modeling applying the three-dimensional laser scanning system of the Haeundae Stone Inscription. Firstly, the three-dimensional digital restoration carried out acquiring of point cloud using wide range and precision scanner, thereafter registering, merging, filtering, polygon mesh and surveyed map drawing. In particular, stroke of letters, inscribed depth and definition appearing the precision scanning polygon was outstanding compared with ones of the wide range polygon. The surface depth modeling completed through separation from polygon, establishment of datum axis, selection of datum point, contour mapping and polygon merging. Also, relative inscribed depth (5~17mm) and outline by the depth modeling was well-defined compared with photograph and polygon image of the inscription stone. The digital restoration technology merging wide range and precision scanning restored the total and detailed shape of the Stone Inscription quickly and accurately. In addition, the surface depth modeling visibly showed unclear parts from naked eye and photograph. In the future, various deteriorations and surrounding environment change of the Stone Inscription will be numerically analyze by periodic monitoring.

Three Dimensional Visualization of Contact Region for a Protein Complex (단백질 복합체를 위한 접촉 영역의 3차원 가시화)

  • Kang, Beom Sik;Kim, Ku-Jin;Kim, Yukyeong
    • KIPS Transactions on Software and Data Engineering
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    • v.2 no.12
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    • pp.899-902
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    • 2013
  • In this paper, we present a method to visualize the contact region between two molecules in a protein complex in a threedimensional space. The contact region of two molecules shows compatibility in geometric aspects. Usually, the computation of the area of contact region has been used to show the strength of compatibility. The numerical value and simple drawing of contact region would be useful for comparing the relative strength of different contacts, but it is not appropriate for analysing the geometric characteristics of the contact region. In this paper, we present a method to show the compatibility between two molecules by visualizing the distance information between them.