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Huang Y.,Ningbo Polytechnic College | Yang G.,Ningbo Wanlong Injection Mold Ltd.
Applied Mechanics and Materials | Year: 2010

The hot runner technology is an advanced & applied technology in process of forming of an injection mold. As soon as the hot runner technology is applied in injection molds, it will obtain the aim for optimization of product quality, increasing efficiency of production, saving raw materials, saving energy, decreasing cost of products and so on. The article will mainly discusses the applied study of hot runner technology in injection mold, and has a detailed explanation for the design instances of hot runner technology in injection mold, the suitability of hot runner system and the technological & economical analyses of hot runner molds. © (2010) Trans Tech Publications. Source

Xia T.,Ningbo Polytechnic College | Zhang Z.,Ningbo Huashuo Modeling and Machine Co. | Kuang X.,Ningbo Huashuo Modeling and Machine Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013

According to the structure characteristics of uneven wall thickness, product requirements and annual output of cylinder head of heavy truck engine, die casting process instead of low-pressure casting process was adopted. The die casting process from the aspects of material composition, gate and injection pressure was improved and optimized, and the die casting process parameters were determined, finally the product defects including solder, crack and porosity were eliminated. Product qualified rate is approximately 95% steadily through testing plane hole leakage at random. Source

Liu W.-Y.,Ningbo Polytechnic College
2010 International Conference on Intelligent Computation Technology and Automation, ICICTA 2010 | Year: 2010

To investigate the pull-in phenomenon of electrostatic micropump, the mechanical behavior of an electrostatic micropump employing a circular membrane is studied using a reduced order model (ROM) of membrane, which is constructed based on numerical calculation and mode superposition method. Comparing the results of ROM with the results calculated by 3D finite element model, it shows the ROM sped up computational cost without sacrificing the accuracy. In addition, the effects of different parameters such as initial gap, thickness, radius, residual stress on pull-in voltage and pull-in position are studied by the ROM, the obtained results provide an effective theoretical basis for the electrostatic micropump design and manufacture. © 2010 IEEE. Source

Peng Z.,CAS Ningbo Institute of Material Technology and Engineering | Peng Z.,Ningbo Polytechnic College | Miao H.,CAS Ningbo Institute of Material Technology and Engineering | Yin H.,CAS Ningbo Institute of Material Technology and Engineering | And 2 more authors.
International Journal of Electrochemical Science | Year: 2013

Phase-pure carbon-coated Li2MnSiO4 cathode material has been prepared through a PEG-assisted solid state reaction strategy. Transmission electron microscopy further confirmed that the Li2MnSiO4 nanocrystals (~50nm) were coated with amorphous carbon layer on their surface. The as-obtained Li2MnSiO4 cathode material exhibited the most initial discharge capacity of 204 mAh g-1 at the 10 mA g-1 current density at room temperature and the highest discharge capacity of 128 mAh g-1 at the 200 mA g-1 current density. Compared with PEG free Li2MnSiO4 cathode material, electrochemical performance of Li2MnSiO4 with PEG was greatly improved due to the pure phase, reduction in particle size. Influences of calcination temperature and PEG addition on phase purity, surface morphology as well as electrochemical performance were studied in detail, in which it was found that PEG as a dispersant made the slurry more uniform and stable during ball milling process and favored the phase-pure Li2MnSiO4. © 2013 by ESG. Source

Huang Y.,Ningbo Polytechnic College
Applied Mechanics and Materials | Year: 2012

Ultrasonic welding is the application of high-technology for welding thermoplastic products. Various thermoplastic parts can be treated by ultrasonic welding without adding any solvent, adhesive or other auxiliaries, which can increase productivity many times, reduce cost and improve the quality of products. Ultrasonic welding technology is being used widely. This article focuses on the application of ultrasonic welding technology, and has a detailed statement of the design of welding spot by using ultrasonic welding technology, the welding structure, the design requirement for ultrasonic welding, and the ultrasonic welding process. © (2012) Trans Tech Publications. Source

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