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Formability evaluation of stainless steel bipolar plate considering draft angle of die and process parameters by rubber forming

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INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING 2014年第5期15卷 913-919页

作者： Jeong, Min-Geun Jin, Chul-Kyu Hwang, Gyu-Wan Kang, Chung-Gil Pusan Natl Univ Grad Sch Mech & Precis Engn Pusan 609735 South Korea Kyungnam Coll Informat & Technol Dept Mech Design Pusan 617701 South Korea Pusan Nation Univ Engn Res Ctr Net Shape & Die Mfg Pusan 609735 South Korea

In this study, the rubber pad forming process is used to fabricate bipolar plates with stainless steel SUS304 for the proton exchange membrane (PEM) fuel cell. The metallic bipolar plates have received considerable attention because of their low cost, excellent mechanical, electrical, and thermal properties, and simplified fabrication techniques. The thin plate with micro channels was fabricated using a hydraulic press with a capability of 200 ton according to the process parameters of the rubber forming (punch speed, plate pressure, rubber thickness, rubber hardness) considering the draft angle of the die and its formability was evaluated.

关键词： Formability Bipolar plate Draft angle processing parameter Fuel cell

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Ascertainment of Machine Tool Adjustment and processing parameters for Spiral Bevel Gears in a Heavy Vehicle Main Driving System

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2nd International Conference on Energy, Environment and Sustainable Development (EESD 2012)

作者： Ding, Yuan Li, Xia Yang, Yongji Ma, Shiqiang Pan, Yuxue Changchun Univ Dept Mech Changchun 130022 Jilin Peoples R China

ISBN: (纸本)9783037855522

Based on partial conjugation principle, revised machine tool adjustment parameters and processing parameters which can make big gear and small gear be in points conjugation meshing progress are obtained after the cutting tooth plan and rough gear parameters of spiral bevel gears in a heavy vehicle main driving system were determined. Ideal gear contact spots are gained by gear contact area rolling experiment, which show that calculation theory and methods above-described are practicable and effective for improving meshing quality of spiral bevel gears in heavy vehicle main driving system.

关键词： Heavy Vehicle Spiral Bevel Gear Machine Tool Adjustment parameter processing parameter

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Study on processing parameters of Supersonic Particles Bombarding treatment

Study on Processing Parameters of Supersonic Particles Bomba...

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International Forum on Mechanical and Material Engineering (IFMME 2013)

作者： Liu, Yuliang Xiong, Tianying Henan Univ Sci & Technol Sch Mat Sci & Engn Luoyang Peoples R China Chinese Acad Sci Inst Met Res Shenyang Peoples R China

ISBN: (纸本)9783037858004

Supersonic Particles Bombarding(SSPB) can introduce severe plastic deformation on the surface of metallic materials, and nanostructured surface layer can be fabricated on the materails. So SSPB is a promosing technology which can be applied in industry. Main parameters of SSPB were optimized by orthogonal design, and their effect on the weight loss of the SSPB treated sample was analysed. Optimized parameters were obtained after the orthogonal experiments.

关键词： processing parameter Supersonic Particles Bombarding orthogonal design weight loss

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The influence of hot-press temperature and cooling rate on thermal and physicomechanical properties of bamboo particle-polylactic acid composites

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HOLZFORSCHUNG 2013年第3期67卷 325-331页

作者： Wu, Tung-Lin Chien, Yi-Chi Chen, Tsai-Yung Wu, Jyh-Horng Natl Chung Hsing Univ Dept Forestry Taichung 402 Taiwan

Extrusion and injection moldings are standard processes for fabricating natural fiber-reinforced plastic composites, but both processes are generally not suitable for production of large-size pieces and products with high loadings of lignocelluloses. In this study, a medium-density bamboo plastic composite (BPC) was completely and successfully manufactured from bamboo fibers and polylactic acid (PLA) in the ratio of 1:1 by the flat-platen pressing process. The effects of pressing and cooling parameters on the thermomechanical properties of the BPCPLA have been investigated. The BPCPLA prepared at temperatures >180 degrees C and cooling rates >10 degrees C min(-1) exhibited superior mechanical properties and matrix crystallinity. Under these conditions, a stronger interaction between the filler and the polymer matrix occurs and the mobility of the molecular chains at the interface decreases, which leads to a higher stiffness of the composite.

关键词： bamboo particle bamboo plastic composite (BPC) green composite polylactic acid processing parameter thermomechanical property wood plastic composite (WPC)

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Fabrication and surface modification of melt-electrospun poly(D,L-lactic-co-glycolic acid) microfibers

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FIBERS AND POLYMERS 2013年第9期14卷 1491-1496页

作者： Kim, Sung Jin Jeong, Lim Lee, Seung Jin Cho, Donghwan Park, Won Ho Chungnam Natl Univ Dept Adv Organ Mat & Text Syst Engn Taejon 305764 South Korea Chungnam Natl Univ FTIT BK21 Taejon 305764 South Korea Ewha Womans Univ Coll Pharm Seoul 120750 South Korea Kumoh Natl Inst Technol Dept Polymer Sci & Engn Kumi 730701 South Korea

In this study, biodegradable poly(D,L-lactic-co-glycolic acid) (PLGA) fibers were prepared by a melt-electrospinning and treated with plasma in the presence of either oxygen or ammonia gas to modify the surface of the fibers. The effects of processing parameters on the melt-electrospinning of PLGA were examined in terms of fiber morphology and diameter. Among the processing parameters, the spinning temperature and mass flow rate had a significant effect on the average fiber diameter and its distribution. The water contact angle of melt-electrospun PLGA fibers decreased significantly from 123 A degrees to 55 A degrees (oxygen plasma treatment) or to 0 A degrees (ammonia plasma treatment) by plasma treatment for 180 sec, while their water content increased significantly from 2.4 % to 123 % (oxygen plasma treatment) or to 189 % (ammonia plasma treatment). Ammonia gas-plasma enhanced the surface hydrophilicity of PLGA fibers more effectively compared to oxygen gas-plasma. X-ray photoelectron spectroscopy analysis supported that the number of polar groups, such as hydroxyl and amino groups, on the surface of PLGA fibers increased after plasma treatment. Overall, the microfibrous PLGA scaffolds with appropriate surface hydrophilicity and fiber diameter could be fabricated by melt electrospinning and subsequent plasma treatment, without a significant deterioration of fiber structure and dimensional stability. This approach of controlling the surface properties and structures of fibers could be useful in the design and tailoring of novel scaffolds for tissue engineering.

关键词： Poly(D,L-lactic-co-glycolic acid) Melt-electrospinning processing parameter Plasma treatment Surface modification

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A weight analysis for the replication accuracy improvement of injection-molded microlens arrays

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OPTOELECTRONICS AND ADVANCED MATERIALS-RAPID COMMUNICATIONS 2013年第3-4期7卷 173-178页

作者： Jiang, Bingyan Shen, Longjiang Weng, Can Cent S Univ Coll Mech & Elect Engn State Key Lab High Performance Complex Mfg Changsha Hunan Peoples R China

Microlens arrays are essential components used in various optical devices. In this paper, a weight analysis aimed for the replication accuracy improvement has been proposed. The effects of processing parameters on the part weight have been investigated by numerical simulations as well as experiments. It is found that the data of part weight from experiments and simulations are of the same order of magnitude. The part weight increases with the increase of the melt temperature and the mold temperature. It increases with the increase of the injection time at first, and reaches its peak value at 0.8s, then decrease with the increase of the injection time. The part weight increases with the increase packing pressure. With increase of packing time, it is rapidly increased at first and then slightly varied, which reaches its peak value at 0.8s. The differences between the experimental and the simulation results are further discussed. It was validated that the weight analysis method can be used to evaluate the replication accuracy in a simple and practical way.

关键词： Replication accuracy Microlens array Injection molding Weight analysis processing parameter

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Simulations of Three-dimensional Thermal Residual Stress and Warpage in Injection Molding

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CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES 2013年第6期96卷 379-407页

作者： Li, Xuejuan Ouyang, Jie Zhou, Wen Xian Univ Architecture & Technol Sch Sci Xian 710055 Peoples R China Northwestern Polytech Univ Sch Sci Xian 710129 Peoples R China

The three-dimensional (3D) mathematical models for thermal residual stress and warpage are proposed in injection molding, in which the temperature model is rebuilt by considering the phase-change effect to improve the computational accuracy. The 3D thermal residual stress model is transformed into the incremental displacement model so that the boundary conditions can be imposed easily. A modified finite element neural network (FENN) method is used for solving 3D warpage model based on the advantages of finite element method and neural network. The influence of phase-change on temperature is discussed. The numerical simulations of thermal residual stress and warpage are realized, and the influences of processing parameters on thermal residual stress and warpage are studied. The numerical results are in accordance with the results in related literature and the theoretic analysis.

关键词： 3D phase-change thermal residual stress warpage processing parameter

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The research of impact ball end mills geometric parameters on processing stable region

The research of impact ball end mills geometric parameters o...

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International Conference on Mechanical Engineering, Materials Science and Civil Engineering (ICMEMSCE 2012)

作者： Jia, D. K. Xiao, F. Wu, S. Harbin Univ Sci & Technol Sch Mech & Power Engn Harbin Peoples R China

ISBN: (纸本)9783037855904

In this paper, modal analysis of ball end mills is modeled by finite element to work out natural frequency and chatter model in tooling system and to calculate the limit curve of stability in single degree freedom system. The effect of cutter flute length and cutter tooth number on maching stability area is also discussed. The results of research show that steady critical cutting depth of milling system declines while the cutter flute length increases, but the trend is not linear, which shows increase partly. An engineering optimization design is made on milling cutter geometrical parameters based on this conclusion.

关键词： processing parameter Ball end mills Experimental model analysis Milling chatter

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The Nonlinear Characteristic of Vibration Signal in Milling flutter process

The Nonlinear Characteristic of Vibration Signal in Milling ...

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International Conference on Mechanical Engineering, Materials Science and Civil Engineering (ICMEMSCE 2012)

作者： Wu, S. Jia, Y. T. Qu, D. Harbin Univ Sci & Technol Sch Mech & Power Engn Harbin Peoples R China

ISBN: (纸本)9783037855904

In order to analysis the nonlinear characteristics of vibration signal in the milling chatter process, this article uses Lyapunov Exponent and Approximate Entropy to analysis vibration signal of stable milling, vibration signal of chatter development and vibration signal of chatter in varied cutting-depth milling process. Plot the relationship curves of milling parameters with Lyapunov Exponent and Approximate Entropy respectively. The results showed that vibration signal had strong chaos characteristics when the milling chatter developed and occurred, and chaos characteristics of the vibration signal can be regarded as an effective method to identify the development and occurrence of chatter, and it also has guiding function for choosing milling parameter.

关键词： processing parameter Milling chatter Nonlinear characteristics Chaos

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Effect of processing parameters on Heat Transfer Performance of the Heat-pipe Grinding Wheel

Effect of Processing Parameters on Heat Transfer Performance...

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2nd International Conference on Advanced Design and Manufacturing Engineering (ADME 2012)

作者： Ma, Ke Fu, Yucan Xu, Hongjun He, Jun Hohai Univ Coll Mech & Elect Engn Changzhou 213022 Peoples R China

ISBN: (纸本)9783037855027

Heat transfer performance of the heat-pipe grinding wheel (HPGW) is mainly depended on the heat pipe in the wheel. In this paper, a basal body of HPGW was developed and a heat transfer experiment was performed to study the effect of the parameters of the heat pipe such as liquid filling ratio and rotating speed on the heat transfer performance of the HPGW. Results show that the heat transfer performance decreases if the liquid filling rate is too large or too small under the same heat source intensity and the optimal liquid filling rate is about 35% of the volume inside the heat pipe. The heat transfer performance of the HPGW is enhanced with the increasing of the rotating speed. The analysis of the results also shows that the heat pipe in the HPGW can play a great role on enhancing the heat transfer in the grinding zone with suitable processing parameters.

关键词： Heat-pipe grinding wheel processing parameter Heat pipe Grinding wheel Heat transfer enhancement

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