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Influence of confining stress on fracture characteristics and cutting efficiency of TBM cutters conducted on soft and hard rock

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Journal of Central South University 2015年第5期22卷 1947-1955页

作者：刘京铄曹平刘杰蒋喆 School of Resources and Safety Engineering Central South University

Combined with numerical simulation, the influence of confining stress on cutting process, fracture conditions and cutting efficiencies of soft and hard rock has been conducted on the triaxial testing machine(TRW-3000) designed and manufactured in Central South University(China). Results are obtained by performing analysis on the fracture scopes of cement and granite plates,the characteristics of cutting force in cutting processes and the cutting efficiency. Firstly, the increase of latitude fracture scope and the decrease of longitude fracture scope are both more notable in the tests conducted on cement plates subjected to the increasing confining stresses; secondly, the increase tendency of peak penetration forces obtained from tests conducted on granite plates is more obvious, however, the increase tendencies of average penetration forces achieved from cement and granite plates are close to each other; thirdly, the cutting efficiency could be improved by increasing the spacing between cutters when the confining stress which acts on soft and hard rock increases in a certain degree, and the cutting efficiency of soft rock is more sensitive to the varying confining stresses.

关键词： triaxial testing machine numerical study tunnel boring machine(TBM) cutter confining stress soft and hard rock cutting efficiency

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An Analysis of the Formation Mechanisms of Abrasive Particles and Their Effects on cutting efficiency

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Fluid Dynamics & Materials Processing 2022年第4期18卷 1153-1167页

作者： Wei Zhang Research Center of Mould Precision Machining&Intelligent Manufacturing Application Ningbo PolytechnicNingbo315800China

Magnetic induction-free abrasive wire sawing(MIFAWS)is a method that combines magnetic fields with traditional free abrasive wire sawing *** abrasive particles(MAPs)are attracted on a magnetized wire,thus leading to an increase in their number into the cutting *** number of instantaneous-effective abrasive particles(IEAPs)adsorbed on the wire surface has a great influence on the cutting efficiency of the saw *** this study,a mathematic model of the movement of the MAP is presented,and the factors influencing the IEAPs number,including slurry-supply speed and slurry dynamic viscosity,are investigated both by means of simulation analysis and *** results indicate that the number of IEAPs decreases with an increase in the slurry supply *** cutting efficiency increases gradually with the increase of slurry supply speed,but the growth rate of wire saw cutting efficiency slows down when the slurry supply speed exceeds a given *** number of IEAPs adsorbed by saw wire increases with a decrease in the dynamic viscosity of the cutting fluid,while the cutting efficiency first increases and then *** cutting efficiency attains its highest value when the dynamic viscosity of the cutting fluid is 0.0047 Pa⋅*** experimental results agree with the simulation results,and provide some guidance for the practical application of the MIFAWS process.

关键词： Instantaneous-effective abrasive particle magnetic field adsorption wire sawing cutting efficiency

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Spray patterns and water flow rates on cutting efficiency

Spray patterns and water flow rates on cutting efficiency

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中华口腔医学会第14次全国口腔医学学术会议（2012年会）

作者： Department of Preventive Dentistry,Ninth People’s Hospital,Shanghai Jiao Tong University School of Medicine.Shanghai,China(200011) YANG Wen-jie

PURPOUSE:High-speed rotary cutting instruments are efficient during clinical procedures because they incorporate water coolant sprays to remove cutting debris and protect the health and vitality of pulpal tissues thro... 详细信息

关键词： Dental high-speed handpieces Water spray pattern Water flow rate cutting efficiency

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Effects of discontinuities on penetration of TBM cutters

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Journal of Central South University 2015年第9期22卷 3624-3632页

作者：刘杰曹平杜春黄蒋喆刘京铄 School of Resources and Safety Engineering Central South University

Based on the triaxial testing machine and discrete element method, the effects of embedded crack on rock fragmentation are investigated in laboratory tests and a series of numerical investigations are conducted on the effects of discontinuities on cutting characteristics and cutting efficiency. In laboratory tests, five propagation patterns of radial cracks are observed. And in the numerical tests, firstly, it is similar to laboratory tests that cracks ahead of cutters mainly initiate from the crushed zone, and some minor cracks will initiate from joints. The cracks initiating from crushed zones will run through the thinner joints while they will be held back by thick joints. Cracks tend to propagate towards the tips of embedded cracks, and minor cracks will initiate from the tips of embedded cracks, which may result in the decrease of specific area, and disturbing layers play as ‘screens', which will prevent cracks from developing greatly. The peak penetration forces, the consumed energy in the penetration process and the uniaxial compression strength will decrease with the increase of discontinuities. The existence of discontinuities will result in the decrease of the cutting efficiency when the spacing between cutters is 70 mm. Some modifications should be made to improve the efficiency when the rocks containing groups of discontinuities are encountered.

关键词： tunnel boring machine(TBM) cutter triaxial testing machine numerical model discontinuity cutting characteristic cutting efficiency

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Analysis and comparison of laser cutting performance of solar float glass with different scanning modes

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Frontiers of Mechanical Engineering 2021年第1期16卷 97-110页

作者： Wenyuan LI Yu HUANG Youmin RONG Long CHEN Guojun ZHANG Zhangrui GAO State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China HG Farley Laserlab cutting Welding System Engineering Co. Ltd.Wuhan 430223China

cutting quality and efficiency have always been important indicators of glass laser *** scanning modes have two kinds,namely,the spiral and concentric circle scanning *** modes can achieve high-performance hole cutting of thick solar float glass using a 532-nm nanosecond *** mechanism of the glass laser cutting under these two different scanning modes has been *** experiments are conducted to explore the effect of machining parameters on cutting efficiency and quality under these two scanning *** indicate that compared with the spiral scanning mode,the minimum area of edge chipping(218340µm)and the minimum Ra(3.01µm)in the concentric circle scanning mode are reduced by 9.4%and 16.4%***,the best cutting efficiency scanning mode is 14.2%faster than that in the spiral scanning *** best parameter combination for the concentric circle scanning mode is as follows:Scanning speed:2200 mm/s,number of inner circles:6,and circle spacing:0.05 *** parameter combination reduces the chipping area and sidewall surface roughness by 8.8%and 9.6%respectively at the same cutting efficiency compared with the best spiral processing *** range of glass processing that can be achieved in the concentric circle scanning mode is wider than that in the spiral *** analyses of surface topography,white spots,microstructures,and sidewall surface element composition are also *** study concluded that the concentric circle scanning mode shows evident advantages in the performance of solar float glass hole cutting.

关键词： laser cutting solar float glass scanning mode surface quality cutting efficiency

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