Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Reduction of the Roll-Over of the Sector Tooth for Achieving Improved Recliner Locking Performance

리클라이너 결합 성능 향상을 위한 섹터투스의 롤오버 저감 방법

  • Received : 2010.05.11
  • Accepted : 2010.08.30
  • Published : 2010.11.01
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Abstract

In this study, effective forming methods for reducing the roll-over of a sector tooth, which is a main component of an automotive seat recliner, are proposed. Due to the large amount of roll-over, accurate contact between the inner gear of a sector tooth and the outer gear of a pawl tooth cannot be normally achieved; thus sensitivity and safety for the passengers decrease. To overcome the aforementioned drawback, we investigated the effect of flowcontrol forming methods involving local embossing die, coining punch, and VIC (Variable Inverse Clearance) on the roll-over depth by FE-analysis and an experiment. The results of a fine-blanking experiment for verifying the proposed methods showed that VIC type is decidedly superior from the aspects of reduction of roll-over and tool strength of the sector tooth.

본 연구에서는 자동차용 시트 리클라이너의 주요 부품인 섹터투스 결합부의 롤오버 저감을 위한 효과적인 성형 방법을 제시하였다. 기존의 성형 공정에 의하여 발생한 과도한 롤오버 때문에 섹터투스 내측기어와 결합 부품인 폴투스 외측기어 간의 정확한 결합이 이루어지지 않아 승차감 및 안전성이 저하된다. 따라서 성형 시, 소재를 롤오버 측으로 유동시켜 롤오버량을 최소화 해야 하며, 이를 위하여 국부 돌기형 다이, 코이닝 펀치를 이용한 방법 및 가변 역클리어런스를 통한 롤오버 저감 방법에 대해 유한요소해석으로 비교 평가 하였고, 이를 검증하기 위해 금형 제작 및 실험을 수행하였다. 실험 결과, 가변 역클리어런스를 이용한 방법이 롤오버 저감 및 금형 강도 측면에서 우수한 특성을 가지는 것을 확인할 수 있었다.

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References

  1. Ko, D. C., Kim, C., Kim, B. M. and Choi, J. C., 1996, "Finite Element Simulation of Sheet Metal Shearing by the Element Kill Method," J. of KSPE, Vol. 13, No. 11, pp. 114-123.
  2. Woo, C. S., Koo, J. S., Cho, H. J., Kim, H. S. and Jeong, J. S., 2001, "Structual Analysis and Evaluation Technologies of Automotive Seat Frames," Proceedings of KSME (A), pp. 806-811.
  3. Husson, C., Correia, J. P. M., Daridon, L. and Ahzi, S., 2008, "Finite Elements Simulations of Thin Copper Sheets Blanking: Study of Blanking Parameters on Sheared Edge Quality," J. of Materials Processing Technology, Vol. 199, pp. 74-83.
  4. Klocke, F., Sweeney, K. and Raedt, H. W., 2001, "Improved Tool Design for Fine Blanking through the Application of Numerical Modeling Techniques," J. of Materials Processing Technology, Vol. 115, pp. 70-75. https://doi.org/10.1016/S0924-0136(01)00771-3
  5. Kwak, T. S., Kim, Y. J., Seo, M. K. and Bae, W. B., 2003, "The Effective V-ring Indenter on the Sheared Surface in the Fine-Blanking Process of Pawl," J. of Materials Processing Technology, Vol. 143-144, pp. 656-661. https://doi.org/10.1016/S0924-0136(03)00311-X
  6. Kim, B. M., Choi, H. S., Chang, M. J., Bae, J. H., Lee, S. B. and Ko, D. C., 2008, "Development of High Precision Plate Holder in Automotive Seat Recliner by Mechanical Press(I): Application of FCF Method," J. of KSPE, Vol. 25, No. 7, pp. 55-63.
  7. Chang, F. S. and Hallquist, J. O., 1994, "Finite Element Analysis of Low-Density High-Hysteresis Foam Materials and the Application in the Automotive Industry," SAE Int’l, 940908, pp.699-707.
  8. Nagpal, R. and Kuo, E. Y., 1996, “A Time-Domain Fatigue Life Prediction Method for Vehicle Body Structures," SAE Int’l, 960567, pp. 607-616.
  9. Park, Y. S., Lee, J. Y., Lim, J. M. and Park, G. J., 1996, "Optimum Design of the Steering Column to Mini-mize the Injury of an Occupant," Int. J. of Vehicle Design, Vol. 17, No. 4, pp. 398-414.
  10. Kondo, K., Maeda, K., Maeda, A. and Hirota, K., 1994, "Develop of a Simple Precision Shearing Process for Thick Plates," J. of JSTP, Vol. 35, No. 396, pp. 67-72.