Development of Estimation Procedure of Contact Heat Transfer Coefficient at the Part-Tool Interface in Hot Stamping Process

Energy efficiency, a high level of passenger safety, and weight reduction of the vehicles still constitute the main functional elements for the design of modern car body structures. Toward this objective, the usage of advanced sheet-metal forming technologies like hot stamping of quenchable boron ma...

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Bibliographic Details
Published in:Heat transfer engineering 2011-05, Vol.32 (6), p.497-505
Main Authors: Abdulhay, Bakri, Bourouga, Brahim, Dessain, Christine, Brun, Gilles, Wilsius, JoËL
Format: Article
Language:English
Subjects:
Applications
Applied sciences
Automotive bodies
Automotive engineering
Blanks
Die casting
Engineering techniques in metallurgy. Applications. Other aspects
Exact sciences and technology
Heat conductivity
Heat transfer
Hot stamping
Metal forming
Metals. Metallurgy
Passenger safety
Quenching
Sheet metal
Steel
Thermal conductivity
Thermal resistance
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Summary:Energy efficiency, a high level of passenger safety, and weight reduction of the vehicles still constitute the main functional elements for the design of modern car body structures. Toward this objective, the usage of advanced sheet-metal forming technologies like hot stamping of quenchable boron manganese steel is developing nowadays. Hot stamping is a combination of hot forming and simultaneously quenching and hardening of the blank. In this article, an experimental procedure developed to estimate the thermal conductance at the part-tool interface during a hot stamping procedure is presented. The tools set (punch and die) has been designed to form omega-shaped samples. This work represents the first stage of the procedure development where the standard experiment is a simple compressive load of sample in the bottom of the omega-shape die, considering the real hot-stamping conditions. Tests are carried out under different contact pressure values for two different blank materials (Usibor 1500P and a material B). The results show that the thermal conductivity increase contributes to the reduction of the thermal contact resistance and therefore to a more rapid cooling of the part.
ISSN:0145-7632
1521-0537
DOI:10.1080/01457632.2010.506362