DOI QR코드

DOI QR Code

A Study of Residual Stress and Plastic Deformation of a Bar with Gap Size Changes Between Rolls in a Two Cross-Roll Straightener

두롤 교정기의 롤 갭 변화에 따른 봉강의 잔류응력과 소성변형에 관한 연구

  • Cho, Hyun-Soo (Technical Research Laboratories, Dongbu Steel Co., Ltd.) ;
  • Hahm, Ju-Hee (Technical Research Laboratories, Dongbu Steel Co., Ltd.) ;
  • Lee, Young-Ho (Technical Research Laboratories, Dongbu Steel Co., Ltd.)
  • Received : 2010.12.16
  • Accepted : 2012.02.07
  • Published : 2012.04.01

Abstract

Cold drawn(CD) bars feature superb surface roughness, dimensional precision, and straightness. They are used in the manufacture of automotive parts and home electrical appliances. Two cross-roll straighteners have been used to manufacture CD bars for these industries. This study investigated the variation of the gap size between the two cross-rolls. It was found that changes in the gap size have a large influence on the residual stress and plastic deformation. Finite element method(FEM) simulations were performed to study the influence of the gap size on the residual stress in CD bars, and experiments were performed to verify the FEM results. The residual stresses were measured with X-ray diffraction in both the axial and the hoop directions.

Keywords

Straightener;Residual Stress;Plastic Deformation;X-ray Diffraction

References

  1. Atienza, J. M., et al., 2005, "Residual Stresses in Cold Drawn Ferritic Rods," Scripta Materialia, Vol. 52, pp. 305-309 https://doi.org/10.1016/j.scriptamat.2004.10.010
  2. Kim, Y., Han, D. S. and Han, G. J., 2008, "The Influence on the Bar Straightness and Roll Strength for the Intersection Angle of a Two Cross-Roll Straightener," Proceeding of the KSME Spring Annual Meeting , pp. 216-219
  3. Asakawa, M., 2000, "Effect of Rod Rolling Conditions on Bright Steel Bar Straightness," JSTP, Vol. 41, No. 468. Pp. 69-73
  4. Lee, S.G., et al., 2005, "A Study on the influence of Process Parameters on Residual Stress and Reducing Residual Stress for Drawn Wire Using FE-Analysis," KSPE, pp. 834-837
  5. Ko, D. C., Hwang, W. H., Lee, S. K. and Kim, B. M., 2006, "A Study on the Method of Residual Stress Relaxation During Wire Drawing and Evaluation of Residual Stress Using Nano Indentation Test," KSPE, Vol. 23, No. 5, pp. 162-169