Comparison of the methods for calculating the interfacial heat transfer coefficient in hot stamping

Zhao, Kunmin; Wang, Bin; Chang, Ying; Tang, Xinxin; Yan, Jianwen

doi:10.1016/j.applthermaleng.2015.01.018

Cited by 30 publications

(7 citation statements)

References 11 publications

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“…In addition to the temperature of the forming tools, the temperature gradient in the blank is controlled by the heat flow across the contacting interfaces, which is commonly defined by the interfacial heat transfer coefficient. Nevertheless, this coefficient is very difficult to evaluate experimentally due to its variation with the contact pressure, the surface temperature difference, among other parameters (Caron et al, 2014;Zhao et al, 2015). Therefore, in the present study, the experimental evolution of the blank temperature (measured in the bottom of the cup) is used to estimate the value of the interfacial heat transfer coefficient.…”

Section: Thermo-mechanical Contact Conditionsmentioning

confidence: 98%

Thermo-mechanical finite element analysis of the AA5086 alloy under warm forming conditions

Neto

Martins

Cunha

et al. 2018

International Journal of Solids and Structures

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Warm forming processes have been successfully applied at laboratory level to overcome some important drawbacks of the Al−Mg alloys, such as poor formability and large springback.However, the numerical simulation of these processes requires the adoption of coupled thermomechanical finite element analysis, using temperature-dependent material models. The numerical description of the thermo-mechanical behaviour can require a large set of experimental tests. These experimental tests should be performed under conditions identical to the ones observed in the forming process. In this study, the warm deep drawing of a cylindrical cup is analysed, including the split-ring test to assess the temperature effect on the springback.Based on the analysis of the forming process conditions, the thermo-mechanical behaviour of the AA5086 aluminium alloy is described by a rate-independent thermo-elasto-plastic material model. The hardening law adopted is temperature-dependent while the yield function is temperature-independent. Nevertheless, the yield criterion parameters are selected based on the temperature of the heated tools. In fact, the model assumes that the temperature of the tools is uniform and constant, adopting a variable interfacial heat transfer coefficient. The accuracy of 2 the proposed finite element model is assessed by comparing numerical and experimental results.The predicted punch force, thickness distribution and earing profile are in very good agreement with the experimental measurements, when the anisotropic behaviour of the blank is accurately described. However, this does not guarantee a correct springback prediction, which is strongly influenced by the elastic properties, namely the Young's modulus.

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Section: Thermo-mechanical Contact Conditionsmentioning

confidence: 98%

Thermo-mechanical finite element analysis of the AA5086 alloy under warm forming conditions

Neto

Martins

Cunha

et al. 2018

International Journal of Solids and Structures

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“…Zhao et al [26]. presented three different methods for calculating the IHTC of 22MnB5 boron steel during hot stamping process and concluded that the Beck's nonlinear estimation method is the most robust and accurate method for identifying the IHTC in hot stamping applications.…”

Section: The Calculation Procedures Of the Ihtcmentioning

confidence: 99%

Determination of interfacial heat transfer coefficient for TC11 titanium alloy hot forging

Wang

Geng

et al. 2017

Heat Mass Transfer

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“…Three calculation methods were used to investigate the IHTC of 22MnB5 boron steel under the hot stamping conditions by Zhao et al [17]. They argue that the Beck's nonlinear inverse estimation method has a higher prediction accuracy.…”

Section: Introductionmentioning

confidence: 99%

Investigation of interfacial heat transfer characterization for TC4 alloy in triple-layer sheet hot stamping process

Zhou

Yang

Wang

et al. 2022

Int J Adv Manuf Technol

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During the hot stamping process, heat exchange always occurs between the hot sheet and cold tools. The interfacial heat transfer in the whole forming process will not only affects the forming quality of the parts but also partially determines their post-form mechanical properties and microstructure distribution. As an essential parameter, the interface heat transfer coe cient (IHTC) is of great signi cance for the prediction of temperature elds in the nite element simulations, especially for the novel forming process named triple-layer sheet hot stamping. In this study, the triple-layer sheet heat exchange experiment is carried out to investigate the interfacial heat transfer behavior of the titanium alloy sheet in the triple-layer sheet hot stamping process. The effects of contact pressure, cladding steel sheet thickness, and contact gap on the interfacial heat transfer behavior and post-form mechanical properties of titanium alloy sheet are analyzed, and the interface heat transfer coe cient between the titanium alloy and high-strength steel sheets is calculated. The nite element model of triple-layer sheet heat transfer is established to verify the accuracy of the calculated interfacial heat transfer coe cient. The results show that the upper and lower steel sheets maintain the temperature of the titanium alloy sheets at a higher level in the triple-layer sheet hot stamping compared with the single-layer one. The temperature of the titanium alloy sheet under the single-layer hot stamping decreases from 900°C to 781.6°C after transferring, a decrease of 118.4°C. The temperature of the titanium alloy sheet only declines by 57.5°C during this period in the triple-layer sheet hot stamping process. In addition, the titanium alloy parts obtained by the triple-layer sheet hot stamping process have better mechanical properties. The IHTC increases with the increase of contact pressure and decreases with the increase of steel sheet thickness and contact gap. The accuracy of the calculated IHTC between the titanium alloy and cladding steel sheets is validated by comparing the results of the experiment and simulation. The maximum error between the simulation results and the experimental measurements is 5.5%.

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Comparison of the methods for calculating the interfacial heat transfer coefficient in hot stamping

Cited by 30 publications

References 11 publications

Thermo-mechanical finite element analysis of the AA5086 alloy under warm forming conditions

Thermo-mechanical finite element analysis of the AA5086 alloy under warm forming conditions

Determination of interfacial heat transfer coefficient for TC11 titanium alloy hot forging

Investigation of interfacial heat transfer characterization for TC4 alloy in triple-layer sheet hot stamping process

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