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- 저자 : Weikang Liang (검색결과 2 건)
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Conduction Heating of Boron Alloyed Steel in Application for Hot Stamping
Weikang Liang,Yong Liu,Bin Zhu,Minglin Zhou,Yisheng Zhang 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
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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Graphene Oxide Nanoplatelets Grafted Jute Fibers Reinforced PP Composites
Youxin Chen,Wenzhe Chen,Weikang Liang,Qianting Wang,Yu Zhang,Jianjie Wang,Changxin Chen 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
To improve mechanical and thermal properties of jute fibers (JFs) reinforced polypropylene (PP) composites, asurface treatment method by grafting graphene oxide nanoplatelets (GONPs) onto JFs was developed. The GONPseffectively enhanced the interfacial adhesion between JFs and PP matrix via improving mechanical interlocking. The resultsshow that PP/JFs-KH570-GONPs composites had the significant improvement of 16.2 % and 12.4 % in tensile and flexuralstrength, respectively. And the thermal property of PP/JFs-Silane-GONPs composites was also improved after treatment. These high performance composites have the potential to be applied in many fields, such as the automotive industry,household products and so on.
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