DOI QR코드

DOI QR Code

An Effect of Warm Shot Peening on the Fatigue Behavior of Suspension Coil Springs

현가장치용 코일스프링의 피로특성에 미치는 온간쇼트피닝 가공의 영향

  • 김기전 (대원강업㈜ 기술연구소) ;
  • 정석주 (서울산업대학교 기계설계 자동화공학부)
  • Published : 2002.06.01

Abstract

The requirements of coil spring fer higher fatigue strength have been increased to achieve the weight reduction of a vehicle. As the possible increase in fatigue strength by using the conventional shot peening treatment is found to be limited, it is necessary to modify the shot peening treatment. The warm shot peening is a shot peening treatment carried out within warm temperature range. The aim of this paper is to analyze some experimental results concerned with the effect of warm shot peening and to discuss the mechanism of warm shot peening in detail. By the results of rotating bending fatigue test, the fatigue strength of test specimen increases up to 23.8% in the production condition of warm shot peening at 200$\^{C}$ compared with conventional shot peening. The major reason why the warm shot peening is effective to the improvement of fatigue strength is the increase of a compressive residual stress distribution, which can be caused by more effective deformation under the condition of warm temperature.

Keywords

References

  1. Akira, T., Hiroshi, K. and Hiroshi, T., 1999, 'Study on Warm Shot Peening for Suspension Coil Spring,' SAE Technical Paper 1999-01-0415, Society of Automotive Engineers
  2. Iida, K., 1984, 'Dent and Affected Layer Produced by Shot Peening,' Proc. of the 2nd International Conference on Shot Peening, Chicago, pp. 283 - 292
  3. Sharma, M. C., 1996, 'Assessment of over Peening by Time on Fatigue Behavior of Spring Steel,' 6th International Fatigue Congress, pp. 1397-1402
  4. 신용승, 정성교, 서유원, 1998, '쇼트피닝한 SCM 22강의 피로특성평가,' 한국공작기계학회논문집, pp. 126-131
  5. 이종규, 김정규, 1997, '피로강도 및 수명에 미치는 Shot Peening에 의한 잔류응력의 영향,' 대한기계학회논문집 A권, 제21권, 제9호, pp. 1498-1506
  6. Eckersley, J. S., 1991, 'Shot Peening Plays a Vital Roll in Rejuvenation of Aging Aircraft,' Shot Peening Theory and Application, Institute for Industrial Technology Transfer International, pp. 241-255
  7. Bergstron, J. and Ericsson, T., 1984, 'Relaxation of Shot Peening Induced Compressive Stress During Fatigue of Notched Steel Samples,' Proc. of the 2nd International Conference on Shot Peening, Vol. 1, Chicago, pp. 241-248
  8. Akber, J. A., Kyriacou, S. and El-Zafrany, A. M., 1993, 'Effect of Shot Peening on the Fatigue Life of Axially Loaded Notched Components', Proc. of the 4th International Conference on Shot Peening, Vol. 1, Tokyo, pp. 349-358
  9. Andreas, W., Vilker, S. and Otmar, V., 2000, 'Effects of Stress and Warm Peening of AISI 4140 on Fatigue Life,' J. of Steel Research, Vol. 71, No.8, pp. 316-321 https://doi.org/10.1002/srin.200001235