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Conduction heating of boron alloyed steel in application for hot stamping

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Abstract

In traditional hot stamping process, heating of the sheet by radiation heating occupies most of cycle time, which limits the application of hot stamping in automotive industry. Thus a faster heating method has great significance on the hot stamping. The conduction heating overcomes shortage of the radiation heating because of higher heating rate and greater energy efficiency. It attracts increasing attention in the application of heating blanks in hot stamping. In the present study, a movable conduction heating device on die was designed in terms of the Joule’s Law. Heating experiments of boron alloyed steel were performed using the developed device. Heating rate and uniform temperature region were investigated in the non-heat preservation condition (NHPC) and the heat preservation condition (HPC). The results revealed that in the HPC, the heating rate was improved by 13.1 °C/s. In addition, the length of the uniform temperature region was lengthened by 15 mm. It was demonstrated that the HPC was preferred. Furthermore, it was indicated that the mechanical properties of the blanks in uniform temperature region of the conduction heating were also superior to that of the radiation heating.

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Abbreviations

Q:

Joule’s heat

I:

current of resistance heating

R:

the resistance of the blank

t:

time of the electrifying

σ :

electric resistivity of the steel

c:

specific heat of the steel

ρ :

density of the steel

w:

width of the blank

h:

thickness of the blank

m:

quality of the blank

∆T:

temperature increment of the blank

∆T/∆t:

heating rate of the blank

HMI:

human machine interface

SCR:

silicon controlled rectifier

PLC:

programmable logic controller

PID:

proportion, integration, differentiation

NHPC:

non-heat preservation condition

HPC:

heat preservation condition

Ac1 :

beginning temperature of the austenite transformation during the heating process

Ac3 :

ending temperature of the austenite transformation during the heating process

Aust :

complete austenitizing temperature

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Authors and Affiliations

  1. State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan, 430074, China

    Weikang Liang, Yong Liu, Bin Zhu, Minglin Zhou & Yisheng Zhang

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  1. Weikang Liang
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  2. Yong Liu
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  3. Bin Zhu
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  4. Minglin Zhou
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  5. Yisheng Zhang
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Correspondence to Yisheng Zhang.

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Liang, W., Liu, Y., Zhu, B. et al. Conduction heating of boron alloyed steel in application for hot stamping. Int. J. Precis. Eng. Manuf. 16, 1983–1992 (2015). https://doi.org/10.1007/s12541-015-0258-z

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  • DOI: https://doi.org/10.1007/s12541-015-0258-z

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