IHTC Mate

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(Determine IHTC value accurately during forming)

In recent years, hot and warm stamping processes were developed as promising technologies to form sheet aluminium alloys at elevated temperatures, increasing their formability and decreasing springback. In non-isothermal warm and hot stamping processes, a hot blank is deformed by cold forming tools, and thus heat transfer occurs between the contacting solids. The interfacial heat transfer coefficient (IHTC) is therefore an important thermophysical parameter in such processes for obtaining precise temperature fields from the formed components in FE simulations. By using a precise definition of the IHTC, the processing window and tool design can subsequently be optimised to achieve the desired cooling rates and post-form mechanical strength. IHTC-mate is able to predict the IHTC evolutions for aluminium alloys as a function of contact pressure, tool material, tool coating, lubricant, surface roughness and initial blank temperature (forming temperature).

IHTC Mate
moduls-detail-img
  • 1. Pedestal
  • 2. Die (punch mat.)
  • 3. Frame
  • 4. Specimen
  • 5. Blankholder
  • 6. Guide pillars
  • 7. Insulating sliding block

Fig. 1. (a) Structure of the IHTC test facility; (b) The IHTC test under unloading conditions; (c) The IHTC test under loading conditions.

More information can be found in the relevant brochure publications as follows:

X. Liu, K. Ji, O. El Fakir, H. Fang, M.M. Gharbi, L. Wang, Determination of interfacial heat transfer coefficient for a hot aluminium stamping process, J. Mater. Process. Technol. 247 (2017) 158–170. doi:10.1016/j.jmatprotec.2017.04.005.

X. Liu, O. El Fakir, L. Meng, X. Sun, X. Li, L. Wang, Effects of lubricant on the IHTC during the hot stamping of AA6082 aluminium alloy: experimental and modelling studies, J. Mater. Process. Technol. 255 (2018) 175–183. doi:10.1016/j.jmatprotec.2017.12.013

X. Liu, O. El Fakir, M.M. Gharbi, L. Wang, Effect of tool coating on interfacial heat transfer coefficient in hot stamping of AA7075 aluminium alloys, Procedia Manuf. 15 (2018) 1127–1133. doi:10.1016/j.promfg.2018.07.378.