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Zhongde Shan,Shaoyan Qin,Qian Liu,Feng Liu 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
Based on analysis of the current situation in the mechanical equipment industry, this paper introduces manufacturing technologies and equipment for sustainable development in the mechanical equipment industry. This paper will consider 8aspects: digital technology, new material, near-net shape forming technology, clean production, short production process technology, waste-free manufacturing technology, automatic control technology, and remanufacturing and reusing technology. It is also important to consider, that as a powerful manufacturing country, we should develop technology and equipment in such a way that protects resources and promotes sustained environmental development. This way, we are able to provide technical support while building a resource-conserving and environment-friendly society.
Hot Stamping Die Design for Vehicle Door Beams using Ultra-High Strength Steel
Chao Jiang,Zhongde Shan,Bailiang Zhuang,Milan Zhang,Ying Xu 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
The energy saving and safety is the eternal theme of development of automobile industry. Ultra-high strength steel automotive body structures of hot stamping have been widely used with these dual advantages that reducing vehicle weight while enhancing safety performance at the same time. The forming and quenching integration die was investigated in this paper with a vehicle door beam as an example, especially the whole die structure and hot stamping process were optimized through numerical simulation of die strength, cooling pipe arrangement and other related factors, and beam samples with tensile strength 1550Mpa, elongation rate 6.5% and shape accuracy of ±0.3mm were produced by this die. Moreover, the stiffness increased by 2.2 times than the original tube beam and 3.8 times of the intensity, which led to full score in C-NCAP Crash Test. By reducing the thickness cross section and the depth of drawing comparing with the original tubular beam,door beam weight could be reduced by 9.32%, which had effective energy-saving and emission-reduction effect.
Fabrication of WC-Co Cutting Tool by Powder Injection Molding
Dongguo Lin,Jifu Xu,Zhongde Shan,정석택,박성진 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.16 No.7
In this work, a cutting tool for sand-mold milling was fabricated by powder injection molding (PIM) technology using 90WC-10Co alloy powder for machining sand molds in patternless sand-casting technology. The work included design of cutting tool tip, injection mold and binder system. Also, for the PIM process, mixing, injection molding, debinding and sintering process were investigated experimentally. Finally, the properties for final products were tested, such as micro structures, element composition, wear resistance and so on. The cutting tool fabricated by PIM had a final density of 14.21 g/cm3 (95% of theoretical density) and a dimension accuracy over 98%. Also, in sand-mold machining test, it showed an abrasion loss of 0.16 mm after working for 3 hrs. The results showed that a whole cutting tool was fabricated using PIM technology successfully, and it showed out good mechanical performances.