Study on the Deformation of Die and Product in Closed Die Upsetting

밀폐 업셋팅에서 금형과 제품 변형에 관한 연구

  • 이강희 (대한상공회의소 공주직업훈련원) ;
  • 박용복 (공주대하교 공과대학 기계공학부)
  • Published : 1999.12.01

Abstract

The study has been performed for the relation between die and product in closed die upsetting by the experiment. The strain of die has been given by the simple experiment using the strain gauge located at the outer surface of die and the deformation history of die and product has been given by the experiment and Lame's formula. The inner pressure of die causes the deformation of die that affects the accuracy of dimension and shape of product. The product with accurate dimension and shape can be obtained by analysing elastic deformation of die during upsetting process. The deformation of die during metal forming process has been usually predicted by the experience of industrial engineers or finite element analysis. But it is difficult to predict the dimension of product at unloading and ejected states. The study has given useful result for the deformation history of die and product through the experiment and Lame's formula at closed die upsetting, and can be applied in the die design for product with accurate dimension.

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