Abstract
The cooling performance of a slice die is studied numerically and experimentally. The slice die is designed to improve the cooling performance compared to that of a conventional die that is generally used in the Hot Press Forming (HPF) process by modifying the cooling channel layout and arrangement. In order to understand the physical phenomenon of the slice die cooling performance, the cooling performance of the conventional die is also simulated and their results are compared with the slice die results. From the results of the maximum temperature of the blank and die and the temperature distribution of the blank, the slice die has considerably improved cooling performance. To validate the simulation results, the slice die is prototyped and a blank is produced by the HPF process. Blank temperatures are measured by a thermal imaging camera at several holding times. The simulation and experimental results of the blank temperatures are compared and agree with the error rate of 3%. In order to verify the quality of the produced blank, ultimate tensile stress, yield stress, and elongation tests are conducted for specimens that are extracted from the blank and are compared with existing literature results.
Highlights
Reinforcement of environmental regulations has become a global trend as environmental problems such as global warming and pollution have emerged as major issues
The analytical analytical models models that that were were used used for for this this study study were were the the conventional conventional die die that that is is generally generally used used in in the the Hot Press Forming (HPF)
The cooling performance of the slice die and conventional die was numerically evaluated by studying the maximum temperature of the blank and die and the temperature distribution of the blank
Summary
Reinforcement of environmental regulations has become a global trend as environmental problems such as global warming and pollution have emerged as major issues. Regulations of exhaust gas reduction and fuel efficiency improvement are changing from advisory implementation to compulsory implementation [1]. Due to this trend, the research topics of eco-friendly vehicles, vehicle weight reduction, and vehicle safety technology have come to the fore in the automotive industry [2]. The issues of vehicle weight reduction and vehicle safety technology are closely related to materials and car bodies [4]. In Europe, a car body was recently made of lightweight materials such as aluminum, magnesium, and carbon fiber reinforced plastic (CFRP), along with steel [5].
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