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Acceleration of floc-water separation and floc reduction with magnetic nanoparticles during demulsification of complex waste cutting emulsions

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Journal of Environmental Sciences 2020年第3期32卷 80-89页

作者： Yongjiao Xiong Xiangfeng Huang Bin Lu Baoqiang Wu Lijun Lu Jia Liu Kaiming Peng College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseMinistry of Education Key Laboratory of Yangtze River Water EnvironmentShanghai Institute of Pollution Control and Ecological SecurityTongji UniversityShanghai200092China

Waste cutting emulsions are difficult to treat efficiently owing to their complex composition and stable emulsified *** an important treatment method for emulsions,chemical demulsification is faced with challenges such as low flocs-water separation rates and high sludge ***,in this study,Fe3O4 magnetic nanoparticles(MNPs)were used to enhance chemical demulsification performance for treating waste cutting emulsions under a magnetic *** addition of MNPs significantly decreased the time required to attain sludge-water separation and sludge compression equilibrium,from 210 to 20 *** addition,the volume percentage of sludge produced at the equilibrium state was reduced from 45% to 10%.This excellent flocculation-separation performance was stable over a pH range of *** magnetization of the flocculants and oil droplets to form a flocculant-MNP-oil droplet composite,and the magnetic transfer of the composite were two key processes that enhanced the separation of cutting ***,the interactions among MNPs,flocculants,and oil droplets were important in the magnetization process,which was controlled by the structures and properties of the three *** the magnetic field,the magnetized flocculant-MNP-oil droplet composites were considerably accelerated and separated from water,and the sludge was simultaneously ***,this study expands the applicability of magnetic separation techniques in the treatment of complex waste cutting emulsions.

关键词： Waste cutting emulsion Magnetic nanoparticle Flocculation Separation Acceleration

A new method for deburring of servo valve core edge based on ultraprecision cutting with the designed monocrystalline diamond tool

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Science China(Technological Sciences) 2019年第10期62卷 1805-1815页

作者： AN QingLong DANG JiaQiang LIU GongYu Dong DaPeng MING WeiWei CHEN Ming State Key Laboratory of Mechanical System and Vibration School of Mechanical Engineering Shanghai Jiao Tong University

Deburring of high-precision components to their micrometer features without any damage is very important but of great difficulty as the burr-to-functionality size ratio increases. To this end, this paper proposes a new deburring method in which the micro burr should be directly removed based on ultraprecision cutting with the designed monocrystalline diamond tool. To determine the feasibility of the proposed method, this paper applies it for deburring of the precision working edge of the servo valve core. Firstly, the monocrystalline diamond tool is carefully designed by covering a variety of topics like rake angle,clearance angle, edge radius. Then, the finite element(FE) simulation was conducted to characterize the deburring performance during the removal of the micro burr produced by the single abrasive grinding. Finally, an innovative self-designed deburring system was introduced and the deburring process was evaluated in terms of cutting forces, temperatures, tool wear mechanisms and deburring quality of the working edges by experiments. The FE simulation results indicate the suitability of the proposed deburring method. Meanwhile, the experimental findings agree well with simulation results and show that ultraprecision cutting with the specialized monocrystalline diamond tool could be successfully used for deburring of servo valve core edge without any damage. This work can provide technical guidance for similar engineering applications, and thus brings an increase to the machining efficiency for the manufacture of precision components.

关键词： monocrystalline diamond tool FE simulation deburring method servo valve core edge ultraprecision cutting

A MECHANICAL MODEL FOR THE CHIP SIDE DEFORMATION IN ALUMINIUM ALLOY cutting

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中国有色金属学会会刊：英文版 1995年第4期5卷 168-172页

作者： Xia Wei Li Yuanyuan Zhou Zehua(Department of Mechanical Engineering,South China University of Technology,Guangzhou 510641) South China Univ of Technology Guangzhou China

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ＡＭＥＣＨＡＮＩＣＡＬＭＯＤＥＬＦＯＲＴＨＥＣＨＩＰＳＩＤＥＤＥＦＯＲＭＡＴＩＯＮＩＮＡＬＵＭＩＮＩＵＭＡＬＬＯＹＣＵＴＴＩＮＧＸｉａＷｅｉ；ＬｉＹｕａｎｙｕａｎ；ＺｈｏｕＺｅｈｕａ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ...

关键词： metal cutting mechanical model cutting force chip side deformation

Microstructure and properties of Fe-based coatings on cutting pick surface formed by plasma jet surface metallurgy

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中国有色金属学会会刊：英文版 2009年第S3期19卷 583-586页

作者：陈颢羊建高李惠琪 School of Materials and Chemical Engineering Jiangxi University of Science and Technology Engineering Research Center of High-efficiency Development and Application Technology of Tungsten Resources of Ministry of Education School of Materials Science Shandong University of Science and Technology

The Fe-based composite coatings were produced on the attrition spot of cutting pick by plasma jet surface metallurgy, and metallurgical bonding was obtained between coating and substrate. The results show that the microstructure, microhardness, wear resistance and erode resistance of the coating are all evaluated. The coating has apparent characteristics of rapid and layered crystallization from planar crystal-cell/dendritic transition zone on the interface, to equiaxed crystal on the midst, to spike crystal on the surface. The microhardness gradually increases from the bottom to the top of the coating. The composite coating has better wear resistance and erode resistance compared to steel substrate.

关键词： cutting pick plasma jet surface metallurgy microstructure wear resistance erode resistance

Numerical Analysis of Tilted cutting and F128 Brushes

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Computer Modeling in Engineering & Sciences 2019年第10期121卷 23-47页

作者： Libardo V.Vanegas-Useche Magd M.Abdel-Wahab Graham A.Parker Facultad de Ingeniería Mecánica Universidad Tecnológica de PereiraLa JulitaPereira 660003Colombia Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityViet Nam Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde 46B-9052 ZwijnaardeBelgium Faculty of Engineering and Physical Sciences University of Surrey.Guildford GU27XHUK.

Road sweeping is an essential service that has to be conducted for public health,as well as aesthetic *** many countries,sweeping vehicles are used for this *** usually comprise a gutter brush that sweeps the debris that is located in the road *** work studies the performance of two kinds of gutter brushes:a cutting brush and a flicking(F128)*** is carried out by means of a 3-D dynamic,nonlinear Finite Element(FE)brush model developed by the *** this model,inertia forces are applied to the bristle,and its clamped end is ***,the surface(road)is rotated,translated,and ***-road interaction is modelled as flexible-to-rigid *** particular,the aim of this article is to compare the performance of a conventional brush and a brush rotating at variable *** brushes normally work tilted,FE analyses are carried out for tilted cutting and F128 brushes,rotating at speeds that fluctuate at different *** is concluded that brush oscillations have a significant effect on bristle tip velocities and bristle-road ***,at certain frequencies,oscillations seem to improve sweeping performance of the F128 ***,they do not appear to improve significantly the performance of the cutting brush.

关键词： Gutter brushes cutting brush flicking brush FEM variable speed brushing

Generalized equation for calculating rock cutting efficiency by pulsed water jets

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第4期11卷 867-873页

作者： Andrey Polyakov Aleksandr Zhabin Eugene Averin Aleksey Polyakov Department of Geotechnologies and Underground Construction Tula State UniversityTula300012Russia OOO Skuratovsky Experimental Plant Tula300911Russia OOO Industrial Safety Examination Tula300600Russia

One of the promising methods for rock cutting technology is the use of high-speed water *** order to improve the cutting capacity of water jets without increasing the hydraulic power of equipment,pulsed water jets are basically used to increase the rock cutting ***,there are no mature recommendations for selection of rational parameters,and the relationship between indicators of rock cutting efficiency and parameters of pulsed water jet is still not *** this context,we aimed at developing a generalized equation for calculating rock cutting efficiency,in which all the major parameters in consideration of rock cutting process are ***,a calibration of the rational parameters of rock cutting by pulsed water jets was *** results are likely helpful for increasing productivity and reducing energy consumption.

关键词： Pulsed water jets Rock cutting Water jet technology Generalized equation Depth of cut

Clearance angle and evolution of depth of cut in actuated disc cutting

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第3期11卷 644-658页

作者： Sevda Dehkhoda Bryce Hill CSIRO Minerals Resources Queensland Centre for Advanced Technologies

This paper investigates the effect of cutter clearance angle on variation of depth of cut and cutting process with an actuated disc cutting(ADC).ADC is a cyclic cutting method with two main characteristics:(i)a disk-shape cutter is used to attack the rock in an undercutting mechanism;and(ii)the cutter is dynamically actuated as it is moved across the ***,the cutting process of such system is periodic,each recurrence known as actuation *** first ADC model,developed in 2016,represented an idealization of the technology with a flat disc cutter,where no clearance angle was *** evolution of the contact between the disc and the rock was,therefore,computed only on horizontal x-y plane,ignoring the effect of normal component of the force acting on *** article reports on a study that incorporates the cutter inclination angle in derivation of cutter/rock interface *** extends the proposed kinematic and geometry based model to take into account the variable depth of cut in estimating the forces associated with cutting in one actuation *** were conducted using Wobble to test the predictions of the improved model at various operating *** model predictions are matched with the experimental results and effects of various factors are analysed.

关键词： Actuated disc cutting Undercutting Force model Wobble Hard rock cutting

AFM based anodic oxidation and its application to oxidative cutting and welding of CNT

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Science China(Technological Sciences) 2009年第11期52卷 3149-3157页

作者： JIAO NianDong WANG YueChao XI Ning DONG ZaiLi State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China Department of Electrical and Computer Engineering Michigan State UniversityEast Lansing 48824USA

Probe anodic oxidation by atomic force microscope (AFM) is one of the most important techniques in fabricating nano structures and devices. The technique was further studied in this paper. By analyzing the distribution of the electric field on substrate surface the dependence of oxide characters on field was discussed. The impacts of various parameters on oxide fabrication were experimentally studied. Based on these studies, we realized the oxidative cutting and welding of carbon nanotube (CNT) by the AFM based oxidation technique and provided a novel technique for the assembly and fabrication of CNT based nano devices.

关键词： anodic oxidation atomic force microscope nanofabrication cutting and welding carbon nanotube

Modeling of the minimum cutting thickness in micro cutting with consideration of the friction around the cutting zone

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Frontiers of Mechanical Engineering 2020年第1期15卷 81-88页

作者： Tianfeng ZHOU Ying WANG Benshuai RUAN Zhiqiang LIANG Xibin WANG Key Laboratory of Fundamental Science for Advanced Machining Beijing Institute of TechnologyBeijing 100081China School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China

Friction modeling between the tool and the workpiece plays an important role in predicting the minimum cutting thickness during TC4 micro machining and finite element method(FEM)cutting *** this study,a new three-region friction modeling is proposed to illustrate the material flow mechanism around the friction zone in micro cutting;estimate the stress distributions on the rake,edge,and clearance faces of the tool;and predict the stagnation point location and the minimum cutting *** friction modeling is established by determining the distribution of normal and shear ***,it is applied to calculate the stagnation point location on the edge face and predict the minimum cutting *** stagnation point and the minimum cutting thickness are also observed and illustrated in the FEM *** cutting experiments are conducted to validate the accuracy of the friction and the minimum cutting thickness *** results show that the proposed friction model illustrates the relationship between the normal and sheer stress on the tool surface,thereby validating the modeling method of the minimum cutting thickness in micro cutting.

关键词： tool friction minimum cutting thickness finite element method tool edge radius micro cutting