• Title/Summary/Keyword: Rectangular Cup Drawing

Search Result 35, Processing Time 0.022 seconds

A Study on the Improvement of Formability of the Stainless Steel Sheets (스테인레스 판재의 성형성 향상에 관한 연구)

  • 배원병;허병우;김호윤;한정영
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 1998.03a
    • /
    • pp.151-154
    • /
    • 1998
  • Stainless steel sheets are widely used to produce electrical appliances. But there are various problems occured in forming stainless steel sheets such as scratch, local fracture, earing. So the productivity of electrical appliances made of stainless steel sheets is decreased. And it is very important to improve the formability of stainless steel sheets. In this study, rectangular cup drawing tests have been carried out to obtain optimum process parameters for improving the formablity of stainless steel sheets. In the tests, selected process parameters are materials of dies and punches, lubricating conditions, and blank holding force. From the test results, we suggest the appropriate conditions to be applicable to the actual manufacturing processes.

  • PDF

Forging Die Design for Vent Forming of Square Cup Battery Case (사각 컵 배터리 케이스 바닥 벤트 성형을 위한 단조 금형 설계)

  • Lee, Sang-Hoon;Kwon, Soon-Ho;Chung, Hoon;Hong, Seokmoo
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.18 no.6
    • /
    • pp.330-335
    • /
    • 2017
  • The demand for electric motor fuel cells has surged in the automotive industry, leading to a recent increase in the demand for square aluminum cans used as fuel cell battery casings. The air vent located on the bottom of the rectangular battery casing prevents large explosions by intermittent pressure release prior to the accumulation of abnormally high pressures. Conventionally, the square cup battery casing is produced via six-step deep drawing, with the outer shape of the vent being manufactured by welding to the square battery casing. On the other hand, this study directly incorporated the air vent outlet into the bottom surface of the rectangular casing. The product of a coupled finite element analysis technique applying the thickness and contour generated from the square cup multi-step deep drawing formation analysis was used as the forging input shape. The results yielded increased prediction accuracy and the advanced prediction of defects, such as swelling and fracture. Based on the results of the initial analyses, two of the generated forging shapes were determined to be suitable, with the optimal forging shape being determined by molding analysis. The results presented here were validated by mold fabrication and a subsequent comparison of the actual and analytical results.

An Improved Scheme for the Blank Holding Force in Sheet Metal Forming Analysis using the Modified Membrane Finite Element Considering Bending Effect (굽힘이 고려된 개량 박막 유한요소를 사용한 박판금속 성형해석에서의 블랭크 홀딩력 적용방법에 관한 연구)

  • Choi, Tae-Hoon;Huh, Hoon
    • Transactions of Materials Processing
    • /
    • v.8 no.4
    • /
    • pp.347-355
    • /
    • 1999
  • The paper is concerned with an improved scheme for application of the blank holding force in order to take account of the thickness distribution in the sheet material of the flange region. The scheme incorporates with a modified membrane finite element method for planar anisotropic materials. The new scheme proposed two coefficients α and βto calculate the compressive stress in the sheet metal due to the blank holding force, which should be determined properly for accurate analysis. The effect of αand βon the blank holding force distribution and the deformed shape is investigated with simulation of rectangular cup deep drawing processes by changing parameter values.

  • PDF

Prediction of Spring Back and Formability in 3-D Stamping by An Explicit Code (Explicit Code에 의한 Stamping시 스프링백 및 성형성 예측)

  • Kim, Heon-Young;Kim, Joong-Jae
    • Transactions of Materials Processing
    • /
    • v.3 no.1
    • /
    • pp.84-96
    • /
    • 1994
  • Simulation of 3 dimensional large irregularly shaped stamping process by a dynamic approach, based on an explicit time integration scheme, has been shown to be highly efficient and robust in comparison to traditional, implicit, quasi-static ones. The objective of the work is to evaluate the results from explicit code in application to deep drawing of rectangular cup and stamping of automotive front fender, in which deformation, force, thickness distribution are calculated. The method of predicting spring back and formability by and explicit code are suggested and applied to the processes.

  • PDF

An Improved Scheme for the Blank Holding Force in 3-D Sheet Metal Forming Analysis (3차원 박판금속 성형해석에서의 블랭크 홀딩력 적용방법에 관한 연구)

  • Choi, Tae-Hoon;Huh, Hoon;Lee, Choong-Ho
    • Proceedings of the Korean Society for Technology of Plasticity Conference
    • /
    • 1997.10a
    • /
    • pp.93-97
    • /
    • 1997
  • Since the modified membrane element has the same external appearance as the ordinary membrane element, it is not able to apply the thickness variation of sheet metal in the blank holder to the contact treatment and the equally distributed blank holding force should be inevitably imposed on sheet metal along the periphery regardless of the contact status. But sheet metal does not contact with the blank holder at the periphery, nor the blank holding force is distributed uniformly along the boundary. To impose the blank holding force properly, the scheme is improved so that the blank holding force at each node imposed on sheet metal is dependent on the calculated thickness derivation and a state of equilibrium with the total blank holding force. The validity of the improved scheme is demonstrated with the simulation of cylindrical and rectangular cup deep drawing.

  • PDF