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Motion Stability Analysis of Non-sinusoidal Oscillation of Mold Driven by Servomotor

Chinese Journal of Mechanical Engineering 2015年第6期28卷 1269-1276页

作者： YAO Yunfeng LI Junxia FANG Yiming School of Materials Science and Engineering Hebei University of Science and Technology Key Laboratory of Material Near-net Forming Technology of Hebei Province Key Laboratory of Industrial Computer Control Engineering of Hebei Province Yanshan University National Engineering Research Center for Equipment and Technology of Cold Strip Rolling

The investments of the electro-hydraulic servo system of the mold non-sinusoidal oscillator are great, the modification ratio of the mechanical type is unable to be adjusted online, and some continuous casters suffer from server resonance during the casting. A mold non-sinusoidal oscillation mechanism driven by servomotor is proposed and the prototype is produced in the lab, the investment is low and the modification ratio is can be adjusted online, and the stability problem is studied. At first the dynamics model of the servomotor non-sinusoidal oscillation is established, and the kinematics differential function is deduced. Furthermore, based on the harmonic balance method, the eigenvalues of the system are solved; the criterion of the stability of the system is put forward. In addition, the eigenvalues and harmonic with different oscillating parameters are analyzed. Analytical results show that the real parts of the eigenvalues are positive, the system will be unstable, and the resonance will occur when the positive real parts of the eigenvalues are extremum. A foundation is established for solving the running smooth problem and next application of this mechanism.

关键词： continuous casting mold non-sinusoidal oscillation servomotor stability resonance

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Study on the production of ceramic glass from calcium-silica residue

Study on the production of ceramic glass from calcium-silica...

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Light Metals 2015 - TMS 2015 Annual Meeting and Exhibition

作者： Sun, Huilan Zhang, Hao Wang, Bo Rong, Shuo School of Materials Science and Engineering Hebei University of Science and Technology Shijiazhuang050018 China Hebei Key Laboratory of Material Near-Net Forming Technology Hebei University of Science and Technology Shijiazhuang050018 China

ISBN: (纸本)9781119082446

Calcium-silica residue is the leaching residue of the lime sinter process which is used to extract alumina from low-grade bauxite or fly ash. The major phases of this residue are dicalcium silicate and calcium carbonate, and the minor phases are aluminates. A large amount of calcium-silica residue is produced because of the high material flow of lime sinter process and most of it is stockpiled. The main contents of the residue, CaO and SiO2, are the same as the main contents of ceramic glass. Therefore, the production of ceramic glass using calcium-silica residue as the main raw materials, B2O3 as fluxing agent and P2O5 as nucleation agent is reported on in this paper. XRD and DSC are used to analyze the property of the ceramic glass. The results show that the flexural strength and corrosion resistance of the ceramic glass obtained through a melting method are better.

关键词： Silica

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Synergistic effect of C12A7 and CA on alumina leaching property under low calcium/aluminum ratio

Synergistic effect of C12A7 and CA on alumina leaching prope...

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Light Metals 2015 - TMS 2015 Annual Meeting and Exhibition

作者： Wang, Bo Liu, Jiajia Sun, Huilan Zhang, Yubing Liu, Dongdong School of Materials Science and Engineering Hebei University of Science and Technology Shijiazhuang050018 China Hebei Key Laboratory of Material Near-Net Forming Technology Hebei University of Science and Technology Shijiazhuang050018 China

ISBN: (纸本)9781119082446

High calcium/aluminum ratio (C/A=12:7) is one of the main problems which inhibit the development of lime sinter process. Decrease the C/A of clinker is studied in this paper. 12CaO·7Al2O3 (C12A7) and CaO·Al2O3 (CA) were synthesized at 1350 °C by analytical pure reagents. The phase composition of sinters was analyzed by XRD and the alumina leaching experiments were carried out. The results show that the optimal alumina leaching ratio of C12A7 and CA are 93.40% and 73.18%. The leaching experiments of the mixture of C12A7 and CA with different proportions were carried out. The alumina leaching ratio of the mixture reaches 91.12% when the content of C12A7 is 40% (in mass). Above this proportion, the alumina leaching ratio increases little. The results show that the existence of C12A7 can promote the leaching property of CA.

关键词： Mixtures

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Effects of the complex strengthening process on microstructure and properties of low carbon steel 9th

Effects of the complex strengthening process on microstructu...

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9th International Forum on Advanced material Science and technology, IFAMST9 2014

作者： Wang, J.G. Hu, J.W. Mao, L. Dai, Y.J. Ju, D.Y. Hebei Key Laboratory of Material Near-Net Forming Technology Hebei University of Science and Technology HebeiShijiazhuang050018 China Department of Material Science and Engineering Saitama Institute of Technology Fusaiji 1690 FukayaSaitama369-0293 Japan

ISBN: (纸本)9783038355960

A numerical simulation method is used to predict the depth distribution of martensite and hardness in the case layer of carburizing (carbonitriding)-quenched 20CrMnTi steel. Microstructure and mechanical properties of 20CrMnTi steel after carbonitriding and subsequent induction hardening is investigated. The results show that the microstructure after nitriding and subsequent induction hardening is main tempered martensite and nitrides;after carbonitriding and subsequent induction hardening is main martensite and a small amount nitrides. The simulation results were a little different from experimental results. According to the results, the factors of reducing the accuracy of the numerical simulation method have been discussed. © (2015) Trans Tech Publications, Switzerland.

关键词： Low carbon steel

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FEM Analysis Of Stamping Process For Vehicle Cowl Inner Panel

FEM Analysis Of Stamping Process For Vehicle Cowl Inner Pane...

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2015 3rd International Conference on Mechanical Engineering and Intelligent Systems(ICMEIS 2015)

作者： Huajun Yan Shibo Ma Lijuan Wang Ying Gao School of Materials Science and Engineering Hebei University of Science and Technology Hebei Key Laboratory of Material Near-net Forming Technology

As the important component for bearing collision in the front of the vehicle, the cowl inner panel has complex shape features such as bulges, reinforcing ribs and holes. When the panel is formed, defects of wrinkling, cracking or incomplete forming will occor. The drawing die is designed for a certain type of the cowl inner panel, and the drawing process is simulated using analysis software Dynaform, and influence laws of the binder force and fillet radii of addendum surface are researched, and process parameters are optimized, that is the binder force F equals to 500 kN, the fillets r equals to 25 mm, r2 equals to 25 mm. The conclusion has a certain effect on forming parts with high quality.

关键词： cowl inner panel addendum surface binder force numerical simulation

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Research on defects and control method based on thread shaft forming

Research on defects and control method based on thread shaft...

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2015 2nd International Conference on Machinery,materials Engineering,Chemical Engineering and Biotechnology(MMECEB 2015)

作者： Huajun Yan Shuangjie Zhang Shibo Ma School of Materials Science and Engineering Hebei University of Science and Technology Key Laboratory of Material Near-net Forming Technology

ISBN: (纸本)9781510819092

The defects of incomplete tooth,low tooth height and big pitch are easy to produce,when the thread shaft is rolled by cross wedge *** forming defects of teeth are researched by theoretical analysis and numerical simulation,the causes of producing tooth defects are analyzed,and forming process is researched by optimizing the die *** open structure of the die is designed as the closed structure on the end of the thread *** addition,the tooth width of the die is optimized from equal width mode to variable width *** higher quality teeth are obtained and tooth defects are *** research results have a good reference for accurately forming thread shaft.

关键词： Cross wedge rolling Thread shaft Pitch Tooth height PITCHES pitch Cross wedge rolling Tooth Control Methods Outcomes Research Open Architecture forming PROCESSES forming

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Influence of temperature on pyrolysis of waste tire under nitrogen atmosphere

Influence of temperature on pyrolysis of waste tire under ni...

引用

International Conference on Information Sciences,Machinery,materials and Energy（ICISMME 2015）

作者： Yongjuan Dai Guohao Zhang Chi Zhang Guanxu Zhang Dengjie You College of Materials science and engineering Hebei university of science and technology Hebei key laboratory of material near-net forming technology Hebei university of science and technology

An experimental survey of waste tire gasification under nitrogen atmosphere has been conducted in a reactor,the gasification of tire were performed in a series of trials at different processing temperatures,in the range of 100–800 ℃,with the aim of studying the influence of the process temperature on the yield and the composition of the *** experimental results showed that thermal stability of waste tire is divided into 3 zone: ~ 200 ℃,200 ℃ to 300℃ and 300℃-800℃.A higher temperature results in a higher syngas production and a lower char yield,due to an enhancement of the solid–gas phase reactions with the *** N conditions,the oil contains more light oil.

关键词： pyrolysis nitrogen atmosphere temperature waste tire

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The effects of alloy composition and annealing time on microstructure and mechanical properties of Zr3Al-based alloys

引用

materials Research Innovations 2015年 19卷 S955-S958页

作者： Li, J.H. Gao, Y. Liu, S. Mao, L. Zhang, F.C. Li, Q. Yanshan University Qinhuangdao066004 China Hebei University of Science and Technology Shijiazhuang050000 China Hebei Key Laboratory of Material Near-Net Forming Technology Shijiazhuang050000 China

ZrAl alloys with three different Al contents (6.0, 7.0, 8.0 wt-%) were melted by non-consumable electric-arc furnace. X-ray diffraction and metallographic analysis were used to study the microstructure and phase composition of ZrAl alloys, then rockwell hardness and tensile properties were tested. The results showed that Al significantly enhanced the hardness of pure Zr, and hardness of as-cast ZrAl alloys increased with the increase of Al content. Homogeneous microstructure of Zr3Al-based alloys could be obtained by annealing, and the annealing time must increase with the increase of Al content. With the increase of annealing time, grain size of Zr3Al-based alloys increased, tensile strength and elongation decreased. This implied that when ensuring complete peritectoid reaction conditions, we should minimise annealing time to avoid coarse grain for the purpose of obtaining Zr3Al-based alloys with excellent mechanical properties. In addition, annealing changed the fracture mode of ZrAl alloys from brittle to ductile. © W. S. Maney & Son Ltd 2015.

关键词： Binary alloys

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Crystal structure and alumina leaching property of Na20 doped C12A7

引用

Light Metals 2014 - TMS 2014 Annual Meeting and Exhibition

作者： Wang, Bo Zong, Shufeng Sun, Huilan Zhang, Jianxin Zhang, Yubing Liu, Dongdong Liu, Jiajia School OfMaterials Science and Engineering Hebei University of Science and Technology Shijiazhuang 050018 China Hebei Key Laboratory of Material Near-net Forming Technology Hebei University of Science and Technology Shijiazhuang 050018 China

ISBN: (纸本)9781118889084

material of Na,0 doped 12Ca07Al203 (C 12A7-Na20) was prepared by the sol-gel method. And the precursor was sintered at 1623K for 3h. The phase composition and crystal structure of C12A7-Na20 was investigated by XRD analysis. The results indicated that Na20 would occupy the position of CaO or vacancy of C12A7 lattice and promote the formation of C12A7 when calcium/aluminum ratio (Ca0/Al203, molar ratio) was 1.4. Na20 would promote the formation of C3A when calcium/aluminum ratio was 1.7. The lattice parameters also proved the solid solution between C 12A7 and Na20. Alumina leaching experiments were carried out in sodium carbonate solution and the relationship between leaching ratio and doping content, calcium/aluminum ratio were established. Copyright © 2014 by The Minerals, Metals & materials Society.

关键词： Lattice constants

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Decomposition property of γ-2CaOSiO2 during leaching process of calcium aluminate slag

引用

Light Metals 2014 - TMS 2014 Annual Meeting and Exhibition

作者： Sun, Huilan Wang, Bo Zhang, Jianxin Zong, Shufeng School of Materials Science and Engineering Hebei University of Science and Technology Shijiazhuang 050018 China Hebei Key Laboratory of Material Near-net Forming Technology Hebei University of Science and Technology Shijiazhuang 050018 China

ISBN: (纸本)9781118889084

γ-2CaOSiO2 is one of the main phases of calcium aluminate slag, which is obtained under 1500°C. Although γ-2CaOSiO2 is more stable than ß-2CaOSiO2, it will still be decomposed by sodium carbonate solution during alumina leaching process, and this will cause the occurrence of secondary reaction. The effect of liquid- solid ratio, caustic alkali, and temperature on decomposition property of γ-2CaOSiO 2 are studied. The secondary reaction mechanism is discussed by XRD analysis. The results indicate that the amount of decomposed SiO2 increase with the increase of caustic alkali concentration, which varies from 30gL-1 to 70g L-1. Leaching temperature affects the decomposition of γ-2CaOSiO2 and secondary reaction obviously. When temperature is above 75°C the influence degree of the latter is more serious than that of the former. XRD results indicate that the stable product of secondary reaction is hydrate garnet at lower temperature, but under higher temperature, hydrate garnet transforms into sodium hydrate alumina-silicate. Copyright © 2014 by The Minerals, Metals & materials Society.

关键词： Sodium Carbonate

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