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

Determination and Analysis of Interface Heat Transfer Coefficients in Hot Forming of Ti-6Al-4V

Ti-6Al-4V 합금의 열간성형에 대한 계면열전달계수의 결정 및 분석

  • 염종택 (한국기계연구원 공정연구부) ;
  • 임정숙 (한국기계연구원 공정연구부) ;
  • 박노광 (한국기계연구원 공정연구부) ;
  • 신태진 (포항공과대학교 기계공학과) ;
  • 황상무 (포항공과대학교 기계공학과) ;
  • 홍성석 (국방과학연구소 기술연구본부)
  • Published : 2003.07.01
Download PDF
⟨ Previous Next ⟩

Abstract

Determination of the interface heat transfer coefficient was investigated in non-isothermal bulk forming of glass-coated Ti-6Al-4V. FE analysis and experiments were conducted. Equipment consisting of AISI Hl3 die was instrumented with thermocouples located at sub-surface of the bottom die. Die temperature changes were investigated in related to the process variables such as reduction, lubricant and initial die temperature. The calibration approach based on heat conduction and FE analysis using an inverse algorithm were used to evaluate the interface heat transfer between graphite-lubricated die and glass-coated workpiece. The coefficients determined were affected mainly by the contact pressure. The validation of the coefficients was made by the comparison between experimental data and FE analysis results.

Keywords

References

  1. J. Eng. Industry v.109 Determination of the interface heat transfer coefficient for non-isothermal bulk-forming processing S.L.Semiatin;E.W.Collings;V.E.Wood;T.Altan https://doi.org/10.1115/1.3187094
  2. J. Eng. Industry v.106 Heat transfer aspects of non-isothermal axisymmetric upset forging P.Dadras;W.R.Wells https://doi.org/10.1115/1.3185932
  3. J. Eng. Industry v.111 Investigation of heat transfer and simulation of metal flow in hot upsetting Y.T.Im https://doi.org/10.1115/1.3188769
  4. Int. J. Mach. Tool Des. Res. v.9 The measurement of temperatures in forging dies M.A.Kellow;A.N.Bramley;F.K.Bannister https://doi.org/10.1016/0020-7357(69)90002-X
  5. J. Mater. Process. Technol. v.45 Evaluation of Temperature and Heat Transfer conditions at the Metal Forming Interface W.Nshama;J.Jeswiet;P.H.Oosthuizen https://doi.org/10.1016/0924-0136(94)90411-1
  6. Proc. Instn. Mech. Engrs. v.212 The interfacial heat transfer coefficient in hot die forging of titanium alloy Z.M.Hu;J.W.Brooks;T.A.Dean
  7. DEFORM users manual(ver.7.0) Scientific Forging Technologies Cooporation

Cited by

  1. An Improved Process Design for the Hot Backward Extrusion of Ti-6Al-4V Tubes Using a Finite Element Method and Continuum Instability Criterion vol.221, pp.2, 2007, https://doi.org/10.1243/09544054JEM705