Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
권호 표지
DOI QR코드

DOI QR Code

Leveling Condition in Cut-To-Length Lines to Produce Low Residual Stress Flat Plate from Hot Rolled Coils

잔류응력이 낮은 평탄한 판재 제조를 위한 열연 코일 교정 조건 도출

  • Published : 2006.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

One of the most important quality problems in flat plate leveled from hot rolled coils in cut-to-Iength lines is bowing and cambering when they are cut in small width parts. It is verified analytically and experimentally that residual stress remained in plate is th ε source of the problem. In order to produce low residual stress flat plate from hot rolled coils, the proper conditions of leveling are studied and two things are implemented. One is proper plastic deformation area ratio to reduce residual stress within customer requirement by applying suitable plastic deformation and maintain leveling load within structural strength limit of leveler. The other is maintaining uniform plastic deformation along the width of the plate during leveling. Customer requirement for residual stress is met by applying above 70% of plastic deformation area ratio and uniform deformation along width of coil by adjusting back up rolls according to deformation analysis of work roll and back up roll assembly and leveling tests.

Keywords

References

  1. E.Thesis, 1985, Corrective sheet metal leveling-Science, Art or Black Magic?, SME Technical Paper, MF85-857
  2. E.Thesis, 2002, Everything you need to know about flatteners and levelers for coil processing-Part 1: How flat-rolled metal gets unflat, The fabricator, Vol.32, No.10(October). (http://www.thefabricator.com/CoilProcessing/CoilProcessing_Article.cfm?ID=311)
  3. E.Thesis, 2003, Everything you need to know about flatteners and levelers for coil processing-Part 3: How coil processors can make metal so it stays that way, The fabricator, Vol.33, No.1(January). (http://www.thefabricator.com/CoilProcessing/CoilProcessing_Article.cfm?ID=315)
  4. E.Thesis, 2003, Everything you need to know about flatteners and levelers for coil processing-Part 4: New applications and options in flattening and leveling, The fabricator, Vol.33, No.2(February). (http://www.thefabricator.com/CoilProcessing/CoilProcessing_Article.cfm?ID=519)
  5. Y. Maeda, 2003, Residual stress control in steel plate by leveling process, CAMP-ISIJ, Vol.16, pp. 392-395
  6. T.Matoba, 1995, Calculation Method of Roller Leveling Conditions for Steel Plates, Journal of JSTP, Vol.36, No.418, pp. 1306-1311
  7. 박기철, 김홍준, 이정희, 2005, 후판재 대체 열연강판 제조기술, POSCO 연구논문, Vol. 10, No. 1, pp. 32-44
  8. K. C. Park, S. M. Hwang, 2002, Development of a Finite Element Analysis Program for Rolelr leveling and application for removing blanking bow defects of Thin Steel Sheet, ISH International, Vol.42, No.9, pp. 990-999 https://doi.org/10.2355/isijinternational.42.990
  9. 梶原哲雄, 古元秀昭, 田甫良, 山本国, 森田壽郞, 1988, Research on Characteristics of the Levelling Load and Torque on The Plate Leveller, 三菱重工技報, Vol.25, No.4, pp. 321-326
  10. T. Matoba, 1995, Unification of evaluation methods for measuring bow of thin gauge steel sheets, Journal of JSTP, Vol.36, No.418, pp. 1312-1317

Cited by

  1. Leveling of Aged Low Carbon Steel Sheets in order to Prevent Shape Defects after Stamping vol.24, pp.4, 2015, https://doi.org/10.5228/KSTP.24.4.241