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Synergistic effects of dodecane-castor oil acid mixture on the flotation responses of low-rank coal:A combined simulation and experimental study

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International Journal of Mining Science and Technology 2023年第5期33卷 649-658页

作者： Fen Xu Shiwei wang Rongjie Kong chengyong wang College of Environmental and Chemical Engineering Dalian UniversityDalian 116622China School of Mines and Mechanical Engineering Liupanshui Normal UniversityLiupanshui 553004China

The utilization of an appropriate collector or surfactant is crucial for the beneficiation of low-rank ***,in previous studies,the selection of surfactants was primarily based on flotation procedures,which hinders the understanding of the interaction mechanism between surfactant groups and oxygen-containing functional groups at the surface of low-rank *** this study,we investigate the flotation of low-rank coal in the presence of a composite collector by using a combined theoretical and experimental *** maximum flotation mass recovery achieved was 82.89%using a 3:1 mixture of dodecane and castor oil ***-transform infrared and X-ray photoelectron spectroscopic analyses showed that castor oil acid was effectively adsorbed onto the surface of low-rank coal,enhancing the hydrophobicity of the *** addition,the diffusion coefficient of water molecules in the water-composite collector-coal system was greater than that in the dodecane ***,due to the presence of castor oil acid in the flotation process,the adsorption distance of dodecane and low-rank coal became *** dynamics simulations revealed that the diffusion and interaction of surfactant molecules at the interface of low-rank coal particles and water was enhanced because the adsorption of the dodecane-castor oil acid mixture is primarily controlled by hydrogen bonds and electrostatic *** on these results,a better surfactant for flotation of low-rank coal is also proposed.

关键词： Low-rank coal Flotation Castor oil acid Surface hydrophobicity Molecular dynamics simulation

Recent Advances in Processing of Biological Tissues

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Chinese Journal of Mechanical Engineering 2022年第3期35卷 1-2页

作者： chengyong wang Zhirong Liao Dong wang Guangdong University of Technology Guangzhou 510006China Faculty of Engineering University of NottinghamNottinghamUK Faculty of Engineering University of ExeterExeterUK

The advancement of surgical technology has greatly improved the capability of clinical treatments in recent *** surgical technologies,such as minimally invasive,implantation interventional,and robotassisted surgeries,have been emerging,and bring enormous benefits to *** these technologies have been widely employed in clinical applications,the fundamentals of the clinical surgeries can also be interpreted in an engineering term as the processing and manipulation of biological tissues and has been merging with biomechanics,materials science and manufacturing science,although surgical technology may stand and often treated as an individual discipline.

关键词： clinical manipulation implantation

Radial Grip Rigidity of the Matching of Lengthened Shrink-fit Holder and Cutter in High-speed Milling

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Chinese Journal of Mechanical Engineering 2012年第1期25卷 179-183页

作者： ZHOU Houming wang chengyong DENG Jianxin PENG Ruitao School of Mechanical Engineering Xiangtan UniversityXiangtan 411105China Institute of Manufacturing Technology of Guangdong University of Technology Guangzhou 510006China

Though the lengthened shrink-fit holder (LSFH) is widely applied in high speed milling of the parts characterized by deep cavities at present, its design and selection mainly depends on the experience and lacks a correct theoretical guidance. In this paper, attention is focus on the radial grip rigidity of the matching of LSFH and cutter in high speed milling. Based on the experiment modal analysis (EMA) technique, an accurate finite element model of the matching of LSFH and cutter is established firstly. Subsequently, the influence of different interference, grip length and spindle speed on the grip rigidity of LSFH are analyzed. The analysis results show that there is a reasonable interference and grip length between the LSFH and cutter so that to have a steepless grip and have a good radial grip rigidity and at the same time to avoid the strength of LSFH to exceed it’s yield limit which will reduce the precision and service life of LSFH, besides when spindle speed reach a extension the weakening influence of the centrifugal force on the radial grip rigidity of the matching of LSFH and cutter should been taken into account. Finally, the finite element analysis results are verified based on the construction of measurement method of the grip rigidity and the results fit very well. The studies provide a theoretical basis for the design, selection and the serialization and standardization of the matching of LSFH and cutter.

关键词： Lengthened shrink-fit holder Finite element analysis Radial grip rigidity High speed milling

GENERATE ROUGH TOOL-PATHS FROM UNORGANIZED POINT-CLOUD DIRECTLY

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Chinese Journal of Mechanical Engineering 2007年第5期20卷 1-4页

作者： WU Shixiong wang chengyong FAN Jingming School of Mechanical and Electrical Engineering Guangdong University of Technology Guangzhou 510006 China

An approach is presented to generate rough interference-free tool-paths directly from massive unorganized data in rough machining that is performed by machining volumes of material in a slice-by-slice manner. Unorganized point-cloud is firstly converted to cross-section data. Then a robust data-structure named tool-path net is constructed to save tool-path data. Optimal algorithms for partitioning sub-cut-areas and computing interference-free cutter-locations are put forward. Finally the tool-paths are linked in a zigzag milling mode, which can be transformed into a traveling sales man problem. The experiment indicates optimal tool paths can be acquired, and high computation efficiency can be obtained and interference can be avoided successfully.

关键词： Rough machining Tool path Unorganized point-cloud

GENERATE TRIANGUUTED SURFACES FROM MASSIVE UNORGANIZED POINTS

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Chinese Journal of Mechanical Engineering 2006年第1期19卷 93-95页

作者： WU Shixiong wang chengyong CHEN Zichen School of Mechanical and Electrical Engineering Guangdong University of Technology Guangzhou 510090 China College of Mechanical and Energy Engineering Zhejiang University Hangzhou 310027 China

A region-growing method for reconstructing triangulated surfaces from massive unorganized points is presented. To save memory space, a ring data structure is adopted to build connections between points and triangulated surfaces. The data-structure allows the efficient retrieval of all neighboring vertices and triangles of a given vertice, To narrow the search range of adjacent points and avoid tuangle intersection, an influence area is defined for each active-edge, In the region-growing process of triangulated surfaces, a minimum-edge-angle-product algorithm is put forward to select an appropriate point to form a new triangle for an active edge. Results indicate that the presented method has high efficiency and needs less memory space, optimized triangulated surfaces with reliable topological quality can be obtained after triangulation,

关键词： Surface reconstruction Triangulated surface Unorganized points

High-Speed Machining of Malleable Cast Iron by Various Cutting Tools Coated by Physical Vapor Deposition

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Chinese Journal of Mechanical Engineering 2021年第3期34卷 299-316页

作者： Suyang Li Haisheng Lin Tingjie Zhang Jianbo Sui chengyong wang School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China Wenshan Business Information Management School Wenshan 530004China

The coating material of a tool directly affects the efficiency and cost of machining malleable cast ***,the machining adaptability of various coating materials to malleable cast iron has been insufficiently *** this paper,turning tests were conducted on cemented carbide tools with different coatings(a thick TiN/TiAlN coating,a thin TiN/TiAlN coating,and a nanocomposite(nc)TiAlSiN coating).All coatings were applied by physical vapor *** a comparative study of chip morphology,cutting force,cutting temperature,specific cutting energy,tool wear,and surface roughness,this study analyzed the cutting characteristics of the tools coated with various materials,and established the relationship between the cutting parameters and machining *** results showed that in malleable cast iron machining,the coating material significantly affects the cutting performance of the *** the three tools,the nc-TiAlSiN-coated carbide tool achieved the minimum cutting force,the lowest cutting temperature,least tool wear,longest tool life,and best surface ***,in comparisons between cemented-carbide and compacted-graphite cast iron machined under the same conditions,the wear mechanism of the coated tools was found to depend on the cast iron being ***,the performance requirements of a tool depend on multiple factors,and selecting an appropriately coated tool for a particular cast iron material is essential.

关键词： Malleable cast iron Tool-workpiece matching Cemented carbide coated tool PVD coating Dry turning

Application of rare-earth and nano elements on diamond cup wheels

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金刚石与磨料磨具工程 2007年第5期27卷 5-9页

作者： Cheng Yunping wang chengyong Hu Yingning Wu Wenge School of Mechanical Engineering and Automation North University of China Taiyuan 030051 China） Guangdong University of Technology Guangzhou 510090 China） Department of Mechanical Engineering Guangxi University Nanning 530004 China）

Diamond cup wheel is used widely as an important tool for machining ceramic *** this paper,nano rare-earth oxide and nano carbide were added in the segments of seven kinds of diamond cup *** performance of diamond cup wheels were tested on a special designed test machine by grinding two kinds of ceramic *** surface morphology of the segments was examined by Scanning Election Microscopy(SEM) and the micro-hardness of segments was *** results showed that nano rare-earth oxide and nano carbide can fine segment micro structure,make grain boundary clear and increase grasping of diamond *** can increase also the wear resistance of diamond cup wheels as well as the grinding ratio.

关键词：金刚石杯状轮瓷砖纳米稀土氧化物碳纳米管

Engagement Angle Modeling for Multiple-circle Continuous Machining and Its Application in the Pocket Machining

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Chinese Journal of Mechanical Engineering 2017年第2期30卷 256-271页

作者： Shixiong WU Wei MA Haiping BAI chengyong wang Yuexian SONG Mechanical and Electrical Engineering Institute GuangdongUniversity of TechnologyGuangzhou 510006China

The progressive cutting based on auxiliary paths is an effective machining method for the material accumulating region inside the mould pocket. But the method is commonly based on the radial depth of cut as the control parameter, further more there is no more appropriate adjustment and control approach. The end-users often fall to set the parameter correctly, which leads to excessive tool load in the process of actual machining. In order to make more reasonable control of the machining load and toolpath, an engagement angle modeling method for multiplecircle continuous machining is presented. The distribution mode of multiple circles, dynamic changing process of engagement angle, extreme and average value of engage- ment angle are carefully considered. Based on the engagement angle model, numerous application techniques for mould pocket machining are presented, involving the calculation of the milling force in multiple-circle continuous machining, and rough and finish machining path planning and load control for the material accumulating region inside the pocket, and other aspects. Simulation and actual machining experiments show that the engagement angle modeling method for multiple-circle continuous machining is correct and reliable, and the related numerous application techniques for pocket machining are feasible and effective. The proposed research contributes to the analysis and control tool load effectively and tool-path planning reasonably for the material accumulating region inside the mould pocket.

关键词： Pocket · Engagement angle · Milling force Circle · High·speed machining

Recent Advances in Soft Biological Tissue Manipulating Technologies

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Chinese Journal of Mechanical Engineering 2022年第3期35卷 3-36页

作者： Zhihua Liu Zhirong Liao Dong wang chengyong wang Chengli Song Haonan Li Yao Liu Guangdong University of Technology GuangzhouChina Guangdong Provincial Key Laboratory of Minimally Invasive Surgical Instruments and Manufacturing Technology Guangdong University of TechnologyGuangzhouChina Faculty of Engineering University of NottinghamNottinghamUK Faculty of Engineering University of ExeterExeterUK School of Medical Instrument and Food Engineering University of Shanghai for Science and TechnologyShanghaiChina Shanxi Key Laboratory of Advanced Manufacturing Technology North University of ChinaTaiyuanChina

Biological soft tissues manipulation,including conventional(mechanical)and nonconventional(laser,waterjet and ultrasonic)processes,is critically required in most surgical ***,the soft tissues,with their nature of anisotropic and viscoelastic mechanical properties,and high biological and heat sensitivities,are difficult to ***,the mechanical and thermal induced damage on the surface and surrounding tissue during the surgery can impair the proliferative phase of ***,understanding the manipulation mechanism and the resulted surface damage is of importance to the *** recent years,more and more scholars carried out researches on soft biological tissue cutting in order to improve the cutting performance of surgical instruments and reduce the surgery induced tissue ***,there is a lack of compressive review that focused on the recent advances in soft biological tissue manipulating ***,this review paper attempts to provide an informative literature survey of the state-of-the-art of soft tissue manipulation processes in *** is achieved by exploring and recollecting the different soft tissue manipulation techniques currently used,including mechanical,laser,waterjet and ultrasonic cutting and advanced anastomosis and reconstruction processes,with highlighting their governing removal mechanisms as well as the surface and subsurface damages.

关键词： Soft biological tissue Surgical processing Tissue cutting Tissue welding