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Grain erosion wear properties and grinding performance of porous aggregated cubic boron nitride abrasive wheels

Chinese Journal of Aeronautics 2023年第6期36卷 446-459页

作者： Biao ZHAO Xin WANG Wenfeng DING Yang WANG Yucan FU Yanjun ZHAO Jianhui ZHU National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China State Key Laboratory of Superabrasives Zhengzhou Research Institute for Abrasive&GrindingZhengzhou 450001China

Cubic boron nitride(cBN)superabrasive grinding wheels exhibit unique advantages in the grinding of difficult-to-cut materials with high strength and toughness,such as titanium alloys and superalloys.However,grinding with multilayered metallic cBN superabrasive wheels faces problems in terms of grain wear resistance,the chip storage capability of the working layers and the stability and controllability of the dressing process.Therefore,in this work,novel metallic cBN superabrasive wheels with aggregated cBN(AcBN)grains and open pore structures were fabricated to improve machining efficiency and surface quality.Prior to the grinding trials,the airborne abrasive blasting process was conducted and the abrasive blasting parameters were optimized in view of wear properties of cBN grains and metallic matrix materials.Subsequently,the comparative experiments were performed and then the variations in grinding force and force ratio,grinding temperature,tool wear morphology and ground surface quality of the multilayered AcBN grinding wheels were investigated during machining Ti-6Al-4V alloys.In consideration of the variations of grain erosion wear volume and material removal rate per unit of pure metallic matrix materials as the abrasive blasting parameters changes,the optimal abrasive blasting parameters were identified as the SiC abrasive mesh size of 60#and the abrasive blasting distance and time of 60 mm and 15 s,respectively.The as-developed AcBN grains exhibited better fracture toughness and impact resistance than monocrystalline cBN(McBN)grains because of the existence of metal-bonded materials amongst multiple cBN particles that decreased crack propagation inside whole grains.The metallic porous AcBN wheels had lower grinding forces and temperature and better ground surface quality than vitrified McBN wheels due to the constant layer-by-layer exposure of cBN particles in the working layer of AcBN wheels.

关键词： Air-borne abrasive blasting Aggregated cBN abrasive grains grinding performance Ground surface quality Self-sharpening ability

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Effect of back pressure on the grinding performance of abrasive suspension flow machining

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Advances in Manufacturing 2022年第1期10卷 143-157页

作者： Ming-Hui Fang Tao Yu Feng-Feng Xi Department of Mechatronic Engineering and Automation Shanghai UniversityShanghai 200444People’s Republic of China Shanghai University of Engineering Science Shanghai 201620People’s Republic of China Department of Aerospace Engineering Ryerson UniversityTorontoCanada

Abrasive suspension flow machining(ASFM)is an advanced finishing method that uses an abrasive suspension slurry for grinding and chamfering as well as the finishing of inaccessible components.This study examines the effect of back pressure on the grinding characteristics of an abrasive suspension flow during the grinding of slender holes.A numerical model was developed to simulate the abrasive suspension flow in a slender hole and was verified experimentally using injector nozzle grinding equipment under different grinding pressures and back pressures.It is shown that the ASFM with back pressure not only eliminates the cavitation flow in the spray hole,but also increases the number of effective abrasive particles and the flow coefficient.Increasing the back pressure during the grinding process can increase the Reynolds number of the abrasive suspension flow and reduce the thickness of the boundary layer in the slender hole.Moreover,increasing the back pressure can improve the flow rate of the injector nozzle and its grinding performance.

关键词： Abrasive suspension flow machining(ASFM)Back pressure Injector nozzle grinding performance

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performance of novel 3D printing tools in removing coronary-artery calcification tissue

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Bio-Design and Manufacturing 2023年第4期6卷 390-404页

作者： Chuhang Gao Zhaoju Zhu Zirui Huang Liujing Chen Lihong Lu Mingcheng Fang Yao Liu Bingwei He College of Mechanical Engineering and Automation Fuzhou UniversityFuzhou 350001China Fujian Engineering Research Center of Joint Intelligent Medical Engineering Fuzhou 350001China Maynooth International Engineering College Fuzhou UniversityFuzhou 350001China Shengli Clinical Medical College of Fujian Medical University Fuzhou 350001China Department of Cardiology Fujian Provincial HospitalFuzhou 350001China Advanced Manufacturing Technology of Shanxi Key Lab North UniversityTaiyuan 030051China

Rotational atherectomy is an effective treatment for severe vascular calcification obstruction,and relies on high-speed grinding(typically 130,000–210,000 r/min)with miniature grinding tools to remove calcified tissue and restore blood flow.However,reports of intraoperative complications are common because of the grinding force,temperature,and debris directly acting on the body during the grinding process,which can easily cause damage to patients.In this study,three novel grinding tools were designed and fabricated and a series of experiments have been conducted to analyze the effects of tool geometry and parameters on grinding performance,that is,force,temperature,and specimen surface morphology.The results show that these tools can effectively remove simulated calcified tissue and that they have two motions,rotation and revolution,in the tube.At higher rotational speeds,grinding force and temperature increase noticeably,while the amount of debris decreases significantly.In addition,by observing the surface morphology of the specimens,we concluded that the material removal rate per unit time is influenced by both rotational speed and tool geometry,and that high rotational speed and a rough tool surface can improve the material removal rate efficiently.

关键词： Rotational atherectomy grinding tool grinding performance Parameter analysis

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Investigation on induction brazing of profiled cBN wheel for grinding of Ti-6Al-4V

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Chinese Journal of Aeronautics 2021年第4期34卷 132-139页

作者： Qilin LI Kai DING Weining LEI Jiajia CHEN Qingshan HE Zhenzhen CHEN School of Mechanical Engineering Jiangsu University of TechnologyChangzhou 213001China Nanjing Forestry University Nanjing 210010China Henan University of Technology Zhenzhou 450007China Key Laboratory of Special Purpose Equipment and Advanced Processing Technology Ministry of Education&Zhejiang ProvinceZhejiang University of TechnologyHangzhou 310032China

Profiled monolayer cBN wheel was induction brazed for grinding of titanium dovetail slot in this study.Aimed at acquiring a uniform temperature distribution along the profiled surface and reducing the thermal deformation of the brazed wheel,a finite element model was established to investigate the temperature uniformity during induction brazing.A suitable induction coil and the related working parameters were designed and chosen based on the simulation results.Ag-Cu-Ti alloy and cBN grains were applied in the induction brazing experiment.The results showed geometric deformation of the brazed wheel was no more than 0.01 mm and chemical reaction layer were found on the brazed joint interface.Further validation tests were carried out by grinding of Ti-6 Al-4 V alloy.Compared to the electroplated wheel,the brazed wheel showed better performance such as low specific grinding energy and good ground quality in grinding of Ti-6 Al-4 V alloy.Abrasion wear was found to be the main failure mode for the induction brazed wheel,while adhesion and grains pull-out were the main failure mode for the electroplated wheel.

关键词： grinding performance Induction brazing Profiled cBN wheel Specific grinding energy Temperature uniformity

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