• Title/Summary/Keyword: 초소성 블로우 성형

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A Study on the Uniform Thickness Distribution in Superplastic Blow Forming Process (초소성 블로우 성형품의 두께분포 균일화 연구)

  • Lee, Jeong-Hwan;Kim, Hyeon-Cheol;Lee, Yeong-Seon;Lee, Sang-Yong;Sin, Pyeong-U
    • Transactions of Materials Processing
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    • v.7 no.6
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    • pp.610-619
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    • 1998
  • The superplastic blow forming technology has advantages of cost reduction and low material consumption. compared to the conventional sheet metal forming technology due to the capability of precisely forming with high elongation and low flow stress. however it has a disadvantage that its partial thickness distribution is non-uniform. A processing technology like diaphragm forming has been developed even though it is difficult to prepare materials for superplastic blow forming. in this study a hemisphere forming of sheet before superplastic forming. It was found that the rotary forming material was less in quantity of cavitation at pole than that of hemisphere part that was superplastic formed without rotary forming treatment. Also discussed are the critical strain which is closely related to cavity shape and size.

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Optimization of Superplastic Forming Process (초소성 성형공정 최적화)

  • Lee, Jeong-Min;Hong, Seong-Seok;Kim, Yong-Hwan
    • Transactions of Materials Processing
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    • v.7 no.3
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    • pp.207-214
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    • 1998
  • Influence of final thickness distribution in superplastic forming processes on mechanical properties of the product becomes very crucial. We should improve the thickness distribution of products by combining process parameters adequately In this paper we adopt a non-linear optimization technique for optimal process design of superplastic forming. And optimum design variable which makes the most adequate thickness distribution in combined stretc/blow forming and blow forming is predicted by this optimization scheme and rigid-viscoplastic finite element method.

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