Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Process Design of Trimming to Improve the Sheared-Edge of the Vehicle Door Latch based on the FE Simulation and the Taguchi Method

유한요소해석 및 다구찌법을 이용한 자동차 도어 래치의 전단면 품질 향상을 위한 트리밍 공정 설계

  • Lee, Jung-Hyun (Department of Mechanical Engineering, Keimyung University) ;
  • Lee, Kyung-Hun (Division of Marine Engineering, Korea Maritime and Ocean University) ;
  • Lee, Seon-Bong (Division of Mechanical and Automotive Engineering, Keimyung University)
  • 이중현 (계명대학교 일반대학원 기계공학과) ;
  • 이경훈 (한국해양대학교 기관공학부) ;
  • 이선봉 (계명대학교 기계자동차공학과)
  • Received : 2016.09.13
  • Accepted : 2016.11.10
  • Published : 2016.11.30
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Abstract

Automobile door latch is a fine design and assembly techniques are required in order to produce them in a small component assembly shape such as a spring, injection products, a small-sized motor. The door latch is fixed to not open the door of the car plays an important role it has a direct impact on the driver's safety. In this study, during trimming of the terminals of the connector main components of the car door latch, reduce rollover and conducted a research to find a suitable effective shear surface. Using the Taguchi method with orthogonal array of Finite Element Analysis and optimal Design of Experiments were set up parameters for the shear surface quality of the car door latch connector terminals. The design parameters used in the analysis is the clearance, the radius, and the blank holding force, the material of the connector terminal is a C2600. Trimming process optimum conditions suggested by the analysis has been verified by experiments, the shear surface shape and dimensions of a final product in good agreement with forming analysis results.Taguchi method from the above results in the optimization for the final rollover and effective shear surface improved for a vehicle door latch to the connector terminal can be seen that the applicable and useful for a variety of metal forming processes other than the trimming process is determined to be applicable.

자동차 도어 래치는 스프링, 사출품, 소형 모터 등의 작은 부품들을 조립하여 제조된다. 이를 위해서는 각 부품의 정밀설계 및 조립기술이 요구된다. 도어 래치는 자동차의 문을 열리지 않게 고정시켜 운전자의 안전에 직접적인 영향을 미치는 중요한 역할을 한다. 따라서 본 연구에서는 자동차 도어 래치의 주요 구성요소인 커넥터 단자의 트리밍 시, 롤오버를 저감하고 적합한 유효전단면을 찾기 위한 연구를 수행하였다. 유한요소해석과 실험계획법의 직교배열을 통한 다구찌법을 이용하여 차량용 도어 래치커넥터 단자의 전단면 품질 향상을 위한 최적 설계변수를 설정하였다. 해석에 사용된 설계변수는 클리어런스, 곡률반경, 블랭크 홀딩력이며, 커넥터 단자의 재질은 C2600이다. 해석을 통해 제안된 최적 트리밍 공정 조건은 실험을 통해 검증되었으며, 최종제품의 전단면 형상과 치수가 성형해석 결과와 잘 일치하였다. 이상의 결과로부터 차량용 도어 래치커넥터 단자의 최종 롤오버 및 유효전단면 향상을 위한 최적화에 다구찌법을 유용하게 적용할 수 있음을 알 수 있으며, 트리밍 공정 이외의 다양한 금속성형공정에도 유용하게 적용할 수 있을 것으로 사료된다.

Keywords

References

  1. T. S. Kwak, Y.J. Kim, M. K. Seo, W. B. Bae, "The effect of V-ring indenter on the sheared surface in the fine-blanking process of pawl," J. Master. Process. Technol., Vol 143-144, pp. 656-661, 2003. DOI: http://dx.doi.org/10.1016/S0924-0136(03)00311-X
  2. T. S. Kwak, Y. J. Kim, W. B. Bae, "Fine element analysis on the effect of die clearance on shear planes in fine blanking," J. Master. Process. Technol., vol. 130-131, pp. 462-468, 2002. DOI: http://dx.doi.org/10.1016/S0924-0136(02)00767-7
  3. Y. J. Kim, T. S. Kwak, W, B, Bae, "Finite element analysis on effect of die clearance on shear planes in fine blanking," J. Kor. Soc. Technol. Plast, vol. 9, no. 2, pp. 40-44, 2000.
  4. J. D. Kim, J. J. Kang, H. K. Kim, S. K. Hong, B. J. Kim, "A progressive fine blanking process design for forming of carrier plate," J. Kor. Soc. Technol. Plast., vol. 14, no. 3, pp. 207-214, 2005.
  5. D. H. Ko, D. C. Ko, Y. N. Kwon, S. W. Kim, H. S. Lee, E. S. Park, B. M. Kim, "FE-simulation of hub clutch in vehicle transmission by roll die forming process," Annuals Spring Conf. of Kor. Soc. Tech. Plast., pp. 35-38, 2010.
  6. B. S. Kang, C. W. Kim, "The Effect of a Radius of Curvature and Coefficient of Friction Applied to Contact Pressure and Stress in the Sliding Core," of Kor. Soc. Tech. Plast., pp. 1313-1318, 2006.
  7. J. H. Lee, W. J. Jung, J. H. Kim, "Influence of Drawing Speed and Blank Holding Force in Rectangular Drawing of Ultra Thin Sheet Metal," Transactions of Materials Processing, vol. 21, no. 6, pp. 348-353, 2012. DOI: http://dx.doi.org/10.5228/KSTP.2012.21.6.348
  8. J. W. Sim, Y. T. Kim, "Effects of Blank Holding Force on the Friction Behavior in Sheet Metal Forming," Transactions of Materials Processing, vol. 16, no. 5, pp. 381-385, 2007. DOI: http://dx.doi.org/10.5228/KSPP.2007.16.5.381
  9. Press Mould Design. Shearing work Clearance, http://m.blog.naver.com/dhghtjrdl/220716711915, May,. 23, 2016.
  10. K. H. Min, S. R. Bee, B. B. Hang, D. H. Jang, "Influence of Punch Nose Radius on the Surface Expansion.," Transactions of Materials Processing, vol. 16, no. 8, pp. 528-589, 2007.
  11. D. C. Ko, D. H. Kim, B. M. Kim, "Application of Artificial Neural Network and Taguchi Method to Perform Design in Metal Forming Considering Workability," Int. J. Mach. Tools Manufact., vol. 39, pp. 771-785, 1999. DOI: http://dx.doi.org/10.1016/S0890-6955(98)00055-8
  12. J. K. Kim, "An Experimental Study on the Optimum Design of Sirocco Fan by Using Taguchi Method," Trans. of the KSME, vol. 23, no. 6, pp. 761-768, 1999.
  13. P. J Ross, Taguchi Techniques for Quality Engineering: loss function, orthogonal experiments, parameter and tolerance design, McGraw-Hill, 1999.