Quality Assessment by Analysis of Yoke Caulking Process Considering Strain Rate Sensitivity

변형률속도 민감성을 고려한 요크 코킹공정의 해석에 의한 품질 평가

  • 박문식 (한남대학교 기계공학과) ;
  • 강경모 (한남대학교 대학원 기계공학과) ;
  • 한덕수 (강원대학교 대학원 기계메카트로닉스공학과)
  • Published : 2003.06.01

Abstract

This paper is to predict quality deterioration resulting from a caulking process of yoke which is a part of automotive steering system. The caluking is a plastic deformation process involving such as impact of high speed tool, contacts between part and fixtures and strain rate sensitivity of the part material. Elaborate application of finite element method is neccesary to calculate changes of part dimensions because they fall into a level of tolerances. Simple work hardening and strain rate sensitive model is proposed fur the material and applied for the simulation by using Abaqus which is able to cater for elastoplastic rate sensitive material and contacts. Numerical results of test models that represent tensile bar and tensile plate are compared with material data inputs. Dimensional changes for the yoke are calculated from simulations and compared to the mesurements and they show good agreement. The method presented here with the material model proved to be valuable to assess quality deterioration for similar metal forming processes.

References

  1. Swift, K. G., Raines,M. & Booker, J. D., 'Analysis of product capability at the design stage,' Journal of Engineering Design, Vol. 10, No. 1, pp. 77-91, 1999 https://doi.org/10.1080/095448299261434
  2. Chun Zhang & Hsu-Pin Wang, 'Robust design of assembly and machining tolerance allocations,' IIE Transactions, Vol 30, No. 1, pp. 17-29, Norcoss, 1998 https://doi.org/10.1080/07408179808966434
  3. Park Moon Shik, 'Accurate assembly and concurrent design of airframe structures,' J. of KSME(A), Vol. 24, No. 4, pp. 811-823, 2000
  4. Serope Kalpakjian, Manufacturing Processes for Engineering Materials, Addison Wesley, pp. 31-44, 1984
  5. Johnson, G. R. & Cook, W. H., 'A constitutive model and data for metals subjected to large strain, high strain rates and high temperatures,' Proceeding of the Seventh International Symposium on Ballistics, pp. 541-547, The Hague, 1983
  6. Follansbee, P. S., 'The Hopkinson Bar,' in Metal Handbook 9th edition, Vol. 8, Mechanical Testing, Americal Society for Metals, pp. 198-203, 1978
  7. Lee, Woei-Shyan & Yang, Gen-Wang 'The plastic deformation behaviour of AISI 4340 alloy steel subjected to high temperature and high strain rate loading conditions,' Journal of Meterials Proceeding Technology, Vol. 71, pp. 224-234, 1997 https://doi.org/10.1016/S0924-0136(97)00079-4
  8. Mingwei Chen, Donglian Lin, Yuanming Xia & C. T. Liu, 'Strain rate sensitivity of ductility in a Fe-28AI alloy under tensile impact,' Scripta Materialia, Vol. 37, No. 8, pp. 1243-1248, 1997 https://doi.org/10.1016/S1359-6462(97)00219-4
  9. 포항종합제철주식회사, 자동차용 냉연강판의 고속 인장 특성 평가, 한국과학기술원, 1999
  10. Yang Hyunmo & Min Oakkey, 'The true stress-strain relation of aluminum alloys in the SHPB tension test,' J. of KSME(A), Vol. 24, No. 8, pp. 1917-1922, 2000