Ningbo Polytechnic College

Ningbo, China

Ningbo Polytechnic College

Ningbo, China
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Xia T.,Ningbo Polytechnic College | Liu H.,Ningbo Polytechnic College | Wu M.,Ningbo Polytechnic College | Peng L.,Ningbo Polytechnic College | Fan J.,Ningbo Polytechnic College
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2017

Auto filter system and condensate system assembly is redesigned which is composed of an oil filter, a water pump and a water cooler. The product has complex structure and high requirement of die casting process. Development of the mold and the products is extremely difficult. Many problems and defects in the product development process are solved to ensure the success of the project by high vacuum die casting technology, automatic electric spraying technology, high pressure cooling intelligent control technology and improvement of product's chemical composition. It provides technical support for the improvement of the relevant structure of many automobile parts. © 2017, Journal Office of Special Casting and Nonferrous Alloys. All right reserved.


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.


Yuan Z.,Ningbo Polytechnic College | Peng Z.,Ningbo Polytechnic College | Chen Y.,Ningbo Polytechnic College | Liu H.,Hubei University for Nationalities
Materials Chemistry and Physics | Year: 2010

A series of tin lead composite oxides were synthesized as anode materials for lithium ion batteries when the precursor was pyrolyzed at different temperatures in high pure argon. The products were characterized by X-ray diffraction (XRD), transmission electron microscopic (TEM) and electrochemical measurements. The results showed that the amorphous PbSnO3 exhibited the best electrochemical property among all of the tin lead composite oxides. The initial reversible capacity of the amorphous PbSnO3 was as high as 622 mAh g-1, and the charge capacity was maintained above 561 mAh g-1 beyond 20 cycles. Crown Copyright © 2009.


Xiong R.-B.,Zhejiang University | Xiong R.-B.,Ningbo Polytechnic College | Huang P.-J.,Zhejiang University | Ke Y.-L.,Zhejiang University
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | Year: 2010

In order to keep and fasten reliably the adjusted posture of large components such as fuselage in aircraft digital assembly, a new adaptive posture following and keeping fixture of large components, based on the principle of aerostatic bearing and universal ball joint, was proposed, and a new flexible fixture called posture following and keeping fixture was developed. The influences of pressure fluctuation and component abrasion on axial clamping force, and the relationship between the reliability level of the mandrel adaptively introducing into the thin-wall barrel and the structure and dimension of the mandrel free end were studied. The theoretic analysis and experiments results show that this method is feasible and reliable for posture following and keeping in relation to different kind of conditions and parameters, and the mandrel can adaptively introduce into the thin-wall barrel on condition that the angle deviation of the mandrel is small.


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.


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.


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.


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.


Yuan Z.,Ningbo Polytechnic College | Zheng H.,Hubei University | Zheng H.,Anshun University | Wang S.,Hubei University | Feng C.,Hubei University
Journal of Materials Science: Materials in Electronics | Year: 2016

Spinel phase LiMn2O4 is synthesized by a polyethylene glycol (PEG)-assisted co-precipitation method. The samples are characterized by X-ray diffraction and scanning electron microscopy techniques. The LiMn2O4 samples synthesized have similar morphology and uniform size of about 150–350 nm. The electrochemical measurements show that as-prepared LiMn2O4 nanoparticle sample using PEG with the molecular weight as 4000 (PEG-4000) shows the best cycling performance and highest rate capability among all samples, its initial discharge capacity is 133 mAhg−1 and maintains at 122 mAhg−1 under 0.5 °C after 50 cycles. The loss of its capacity was just 5.1 %. To control the particle size of LiMn2O4 is one of important factors for its application as a cathode material. © 2016 Springer Science+Business Media New York


Huang Y.,Ningbo Polytechnic College | Yang G.,Ningbo Wanlong Injection Mold Ltd. Co.
Energy Procedia | Year: 2012

From the point of view of energy-saving and clean production, plastic molding factories are the typical and raw materials-consumed ones in our industrial production, and how to achieve energy-saving, lower consumption, clean green production in the plastic molding factories is a very important technological research subject. This article has a concrete technological states for how to eliminate the energy wastage, raw material waste and water resources waste in plastic molding factories, and in the energy consumption status of plastic molding factories based on the practical analysis of, in order to improve the use ratio of resource as the goal, uses the green production technology as a solution, realizes the green production of plastic products production factories finally. © 2011 Published by Elsevier Ltd.

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