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논문 상세정보

자동차 외판의 미세면굴곡 거동의 수치해석적 평가

A Numerical and Experimental Study of Surface Deflections in Automobile Exterior Panels

Abstract

Surface deflections have a great effect on the external appearance of automobiles. Usually, they are occurred on large flat panels containing sudden shape changes and of very small size about $\pm$30$\sim$300$\mu$m. Since the current numerical method is not sufficient for predicting these defects, the correction of these defects still depends on trial and error, which requires a great deal of time and expense. Consequently, developing the numerical method to predict and prevent these defects is very important far improving cosmetic surface qualities. In this study, an evaluation system that can analyze surface deflections using numerical simulation and a visualization system are reported. To calculate the surface deflections numerically, robust algorithms and simulation methodologies are suggested and to visualize them quantitatively, the curvature variation algorithm is proposed. To verify the developed systems, the experimental die of the handle portion of exterior door is analyzed. The results showed that the experimental and simulational visualization are in good agreement. Compensation methods to correct the surface deflections are also tested. The evaluation system proposed in this paper could be used to predict and minimize the occurrence of surface deflections in die manufacturing.

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참고문헌 (8)

  1. Nakagawa, N., 'Handbook of Ease or Difficulty in press forming,' National Center of Manufacturing Science 2nd edition, Ed. by The Japan Sheet Metal Forming Research, Japan, 1997 
  2. Yoshida, M. and Shimomura, T., 'A study of Surface Deflection Around the Handle Portion of an Automotive Door-Outer Panel Using a Model Die,' Journal of the Japan Society for Technology of Plasticity, Vol. 24, No. 275, pp. 1260-1267, 1983 
  3. Matsui, M. and Iwata, N., 'Initiation and Growth of Buckles of Square Steel Sheets by Diagonal Biaxial Tension,' Journal of the Japan Society for Technology of Plasticity, Vol. 24, No. 275, pp. 1268-1273, 1983 
  4. Usuda, M., Hayashi, H., Oue, T. and Oikawa, H., 'Classification and Analysis of Surface Deflection due to Elastic Recovery,' Journal of the Japan Society for Technology of Plasticity, Vol. 24, No. 275, pp. 1274-1281. 1983 
  5. Hayashi, H., Hirata, M., Hira, T. and Yoshida, K., 'Buckling Behavior of a Square Specimen in the Diagonal Tensile Test (Yoshida Buckling Test and Its Application 1),' Journal of the Japan Society for Technology of Plasticity, Vol. 24, No. 275, pp. 1298-1304. 1983 
  6. Liu, L., Sawada, T. and Sakamoto, M., 'Evaluation of the Surface Deflections in Pressed Automobile Panels by an Optical Reflection Method,' Journal of Material Processing Technology, Vol. 103, pp. 280-287,2000 
  7. Zhu, Y. and Zacharia, T., 'A New One-point Quadrature, Quadrilateral Shell Element with Drilling Degrees of Freedom,' Computer Methods in Applied Mechanics and Engineering, Vol. 136, pp. 165-203, 1996 
  8. Chung, W. J., 'A Finite Element Analysis of Springback in Sheet Metal Forming,' Trans. of the Korean Society of Mechanical Engineering-A, Vol. 23,pp.2197-2208.1999 

이 논문을 인용한 문헌 (1)

  1. Chung, Yun Chan ; Lee, Sang Heon ; Chang, Dae Soon ; Park, Sang Chul 2013. "Measured Data based Inspection for Unintended Deflections in Automotive Outer Panels" 한국CAD/CAM학회논문집 = Transactions of the Society of CAD/CAM Engineers, 18(2): 113~119 

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