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STUDY　ON　OPTIMAL　INITIAL　WORK　roll　PROFILE　FOR　COLD　STRIP　MILL

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Chinese Journal of Mechanical Engineering 1997年第3期10卷 214-219页

作者： ( )

Themodelofpredictingdistributionsofstripthicknessattheexitandtensionstressesisestab-lishedbyconsideringmetallateralflow,anewkindofmethodofcalculatingloadedrollgapinrelationtotargetstressisproposed.Objectivefunctionistheminimizationofthesquarianceofloadedrollgapdevia-tionusedforthefirsttimetooptimizeinitialworkrollprofile.Work　roll　profile,Optimization,Loaded　roll　gap

关键词：四辊冷轧机辊型设计 COLD INITIAL MILL ON OPTIMAL PROFILE roll STRIP STUDY WORK

Computer simulation of rolling wear on bionic non-smooth convex surfaces

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Journal of Bionic Engineering 2004年第4期1卷 241-247页

作者： HAN Zhi-wu1, LIUZu-bin2, YANG Zhuo-juan1, YAN Yu-ying3, REN Lu-quan1 1. Key Laboratory for Terrain-machine Bionics Engineering (Ministry of Education, China), Jilin University, Changchun 130022, P. R. China 2. Changchun Institute of Automobile, Changchun 130051, P. R. China 3. School of the Built Environment, The University of Nottingham, University Park, Nottingham NG7 2RD, UK 1 Key Laboratory for Terrain-machine Bionics Engineering (Ministry of Education China) Jilin University Changchun 130022 P. R. China Changchun Institute of Automobile Changchun 130051 P. R. China School of the Built Environment The University of Nottingham University Park Nottingham NG7 2RD UK

The study of bionics has found that the skins of many burrow animals which live in soil and stone conditions have an anti wear function, and which is related to their body surfaces’non-smooth morphology. In the present study, bionic non-smooth surfaces are used in roll surface design, and roll models with convex non-smooth surfaces are developed. The rolling wear of non-smooth roll in steel rolling is simulated by the FEM software-ANSYS. The equivalent stress, the node friction stress, and the node contact pressure between the roll and the rolling piece are calculated; and the anti-wear mechanism is analyzed.

关键词： bionics biomimetics non-smooth surface roll rolling wear FEM 1

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1235铝合金连续铸轧态微观组织的表征

中国有色金属学报 2014年第4期24卷 863-869页

作者：毛宏亮王剑华杨钢史庆南易健宏陈亮维昆明理工大学材料科学与工程学院昆明650093 云南省昆明冶金研究院材料研究所昆明650031

采用连续铸轧方法制备6 mm厚、牌号为1235的铝合金，利用高分辨透射电镜（TEM）、扫描电镜（SEM）和背散射电子衍射技术（EBSD）对铸轧态（TRC）样品的微观结构进行表征。结果表明：铸轧态的1235铝合金具有快速凝固组织，即晶粒尺寸在30... 详细信息

采用连续铸轧方法制备6 mm厚、牌号为1235的铝合金，利用高分辨透射电镜（TEM）、扫描电镜（SEM）和背散射电子衍射技术（EBSD）对铸轧态（TRC）样品的微观结构进行表征。结果表明：铸轧态的1235铝合金具有快速凝固组织，即晶粒尺寸在30-100 nm之间的纳米多晶组织，有沿（）晶面滑移的滑移带和高密度位错线等深度塑性变形组织，还有沿（100）晶面生长的再结晶组织；Fe和Si等掺杂元素固溶在基体Al中；在铸轧态下晶粒直径几乎分布在20-50μm之间，且产生的较强织构有{210}〈122〉、{122}〈210〉和{210}〈125〉等，较弱的织构有铜织构{112}〈111〉和{112}〈110〉。

关键词： 1235铝合金连续铸轧微观结构高分辨透射电镜电子背散射衍射织构 twin roll casting(TRC) backscattered electron diffraction(EBSD)

MELINIKOV’S METHOD FOR NON-LINER rollING MOTIONS OF A FLOODED SHIP

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Journal of Hydrodynamics 2005年第5期 64-68页

作者： PU Jin-yun, ZHANG Wei-kang, JIN Tao, JI GangCollege of Ship and Power, University of Naval Engineering, Wuhan 430033, China

To investigate the rolling motions of a flooded ship, non-linear coupled dynamics of roll and flooded water are derived using Lagrange’s principle. Decoupling the coupled equations gives a single-freedom ordinary differential equation, which can describe the rolling motion of the flooded ship. Melinkov’s method is used to predict the chaos behavior of the ship. Numerical computations are performed for three statuses of a ship model. The comparison of the results shows that the more cabins flooded, the more likely a chaos phenomenon will appear.

关键词： ship flooding roll Melinikov’method

Towards Energy Efficient Shape rolling:roll Pass Optimal Design and Case Studies

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Chinese Journal of Mechanical Engineering 2019年第3期32卷 78-88页

作者： Kan Huang Bin Huang Lei Fu Kazem Abhary School of Civil Engineering Changsha University of Science and TechnologyChangsha 410114China School of Engineering University of South AustraliaAdelaideSouth Australia 5095Australia

Shape rolling is widely employed in the production of long workpieces with appropriate cross-section profiles for other industrial applications. In the development of shape rolling systems, roll pass design (RPD) plays an essential role on the quality control of products, service life of rolls, productivity of rolling systems, as well as energy consumption of rolling operations. This study attempts to establish a generic strategy based on hybrid modeling and an improved genetic algorithm, to support the optimizations of RPD and shape rolling operations at a systematic perspective. Objectives include improving the quality and efficiency of RPD, reducing energy consumption of shape rolling, as well as releasing the demands on costly trails and expert knowledge in RPD. Hybrid modeling based on cross-disciplinary knowledge is developed to overcome the limitations of isolated single-disciplinary models. And conventional genetic algorithm is improved for the implementation of optimal design. Targeting to integrate empirical data and published reliable solutions into optimizations, a parameters estimation method is proposed to transfer the initially misaligned models into a uniform pattern. A tool based on the Matlab platform is developed to demonstrate the optimal design operations, with case studies involved to validate the proposed methodology.

关键词： roll pass optimal design Hybrid modelling Genetic algorithm Parameters estimation

NUMERICAL SIMULATION FOR WIDE MAGNITUDE AND HIGH SPEED ALUMINUM FOIL MILL

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中国有色金属学会会刊：英文版 1998年第2期8卷 70-74页

作者： Wang Hongxu and Lian Jiachuangrolling Steel Institute, Yanshan University, Qinhuangdao 066004, P. R. ChinaZhang Junliang and Chen ShuyunBohai Aluminum Industries Company Limited, Qinhuangdao 066000, P. R. China

ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＦＯＲＷＩＤＥＭＡＧＮＩＴＵＤＥＡＮＤＨＩＧＨＳＰＥＥＤＡＬＵＭＩＮＵＭＦＯＩＬＭＩＬＬ①ＷａｎｇＨｏｎｇｘｕａｎｄＬｉａｎＪｉａｃｈｕａｎｇＲｏｌｉｎｇＳｔｅｌＩｎｓｔｉｔｕｔ... 详细信息

ＮＵＭＥＲＩＣＡＬＳＩＭＵＬＡＴＩＯＮＦＯＲＷＩＤＥＭＡＧＮＩＴＵＤＥＡＮＤＨＩＧＨＳＰＥＥＤＡＬＵＭＩＮＵＭＦＯＩＬＭＩＬＬ①ＷａｎｇＨｏｎｇｘｕａｎｄＬｉａｎＪｉａｃｈｕａｎｇＲｏｌｉｎｇＳｔｅｌＩｎｓｔｉｔｕｔｅ，ＹａｎｓｈａｎＵｎｉｖｅｒｓｉ...

关键词： aluminum foil roll system elastic deformation roll thermal deformation shape

Study on Vertical Vibration Characteristics of the 2-DOF Strip rolling Mill Model with a Single Weak Defect on the Work roll Bearing Outer Raceway

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Mechanical Engineering Science 2019年第1期1卷 63-68页

作者： Zhengnan Sun Dongxiao Hou Liang Xu Peiming Shi Department of Control Engineering Northeast University at QinhuangdaoQinhuangdaoChina School of Electrical Engineering Yanshan UniversityQinhuangdaoChina

Considering the influence caused by a early single pit defect on the outer raceway of the work roll bearing,a 2-DOF plate strip rolling mill vertical vibration model with a single point weak fault on the outer raceway was established.With the practical parameters of the roughing mill of the 1780 hot continuous rolling mill,the vertical vibration characteristics of the rolling mill work roll with different rotating speed and different single pit defect area on the bearing outer raceway are analyzed by numerical simulation.It is found that with the change of the rotation speed of the work roll,different nonlinear vibration behaviors occurred,such as superharmonic resonance,main resonance,com-bined resonance and sub-harmonic resonance.Especially the subharmonic resonance of the work roll is more harmful than the main resonance when the work roll speed is twice the rotation speed corresponding to the first and second natural frequency of the rolling mill.This work provides a theoretical basis for further clarifying the effect caused by a early defect of the work roll bearing on the mill vibration.

关键词： Work roll bearing Weak defect Strip mill Vertical vibration

Investigating of the Microstructure and Mechanical Properties of Al-Based Composite Reinforced with Nano-Trioxide Tungsten via Accumulative roll Bonding Process

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Open Journal of Metal 2017年第1期7卷 9-23页

作者： Jalal Kahani Khabushan Soheila Bazzaz Bonabi R&D Department Oghab Afshan Industrial & Manufacturing Company Semnan Iran Faculty of Materials and Metallurgical Engineering Semnan University Semnan Iran

In the present investigation, an Al/WO3p metal matrix nanocomposite was fabricated by accumulative roll bonding (ARB) technique. Microstructural evaluation and mechanical properties of specimens were studied by Field Emission-Scanning Electron Microscopy, X-ray Diffraction, microhardness and tensile test. Several factors that affect uniform distribution of reinforcing particles were investigated. At the initial stages of ARB process particle free zones as well as particle clusters were observed in the microstructure of the composite. After 12 ARB cycles, a nanocomposite with a uniform distribution of nanoparticles was produced. It was shown that the tensile strength of the ARBed composite enhanced with the increasing number of ARB cycles. After the first cycle, a significant increase was observed in the tensile strength of nanocomposite in 2.0 percent volume of WO3p, from 89 MPa to 128 MPa (almost 1.4 times increase in strength). After the final cycle, the tensile strength value increased to 205 MPa (that is almost 2.3 times increase in strength) due to the strain hardening and grain refinement. The X-ray diffraction results showed that Al/WO3p nanocomposite with the average crystallite size of 41 nm was successfully attained after 12 cycles of the ARB process. Finally, observations revealed that the fracture mode in Al/WO3p nanocomposite was of type shearing ductile fracture with elongated shallow dimples.

关键词： Accumulative roll Bonding Nanocomposite Microstructure Mechanical Properties

Development of Centrifugal Cast High Speed Steel roll with High Wear Resistance for Pre-Finishing Stands of a Hot Rod-Wire Mill

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International Journal of Plant Engineering and Management 2004年第3期9卷 177-182页

作者： JIANGZhi-qiang FENGXi-lan FUHan-guang SHAQuan-you ZhengzhouInstituteofAeronauticalIndustryManagement Zhenghou450015P.R.China SchoolofMechanicalEngineering Xi＇anJiaotongUniversityXi＇an710049P.R.China

The present study aims at developing high speed steel (HSS) as roll materialsto replace traditional roll materials such as the alloy cast iron and powder metallurgical (PM)hard alloy, because low-cost alloy cast iron rolls have poor wear resistance and the cost ofhigh-quality PM hard alloy rolls is too high to be accepted by some users. By means of a centrifugalcasting method, HSS rolls with excellent wear resistance have been developed. Its hardness is 65-67 HRC, and its variation is smaller than 2HRC; its impact toughness excels 15J/cm^2. Usingpre-finishing stands of a high-speed hot wire-rod rolling mill, the wear rate of HSS rolls per onethousand ton of steel is 0. 25mm. However, the manufacturing burden of HSS rolls is obviously lowerthan that of PM hard alloy rolls; it is only 30% of that of PM hard alloy rolls.

关键词： high speed steel centrifugal casting hard alloy roll segregation crackle