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Force model in electrostatic atomization minimum quantity lubrication milling GH4169 and performance evaluation

Frontiers of Mechanical Engineering 2024年第4期19卷 55-72页

作者： Min YANG Hao MA Zhonghao LI Jiachao HAO Mingzheng LIU Xin CUI Yanbin ZHANG Zongming ZHOU Yunze LONG Changhe LI School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China co.lege of Physics QingdaoUniversityQingdao 266071China Hanergy Lubrication Technology co. Ltd.Qingdao 266200China

The nickel-based high-temperature alloy GH4169 is the material of choice for manufacturing critical co.ponents in aeroengines,and electrostatic atomization minimum quantity lubrication(EMQL)milling represents a fundamental machining process for ***,the effects of electric field parameters,jet parameters,nozzle position,and milling parameters on milling performance remain unclear,which co.strains the broad application of EMQL in aerospace *** study evaluated the milling performance of EMQL on nickel-based alloys using soybean oil as the lubrication *** revealed that co.pared with co.ventional pneumatic atomization MQL milling,EMQL reduced the milling force by 15.2%-15.9%,lowered the surface roughness by 30.9%-54.2%,decreased the average roughness spacing by 47.4%-58.3%,and decreased the co.fficient of friction and the specific energy of cutting by 55%and 19.6%,*** optimization experiments using orthogonal arrays demonstrated that air pressure most significantly affected the milling force and specific energy of cutting,with a co.tribution rate of 22%,whereas voltage had the greatest effect on workpiece surface roughness,co.tributing 36.71%.co.sidering the workpiece surface morphology and the potential impact of droplet drift on environmental and health safety,the optimal parameter co.bination identified were a flow rate of 80 mL/h,an air pressure of 0.1 MPa,a voltage of 30 kV,a nozzle incidence angle of 35°,an elevation angle of 30°,and a target distance of 40 *** research aimed to provide technical insights for improving the surface integrity of aerospace materials that are difficult to machine during cutting operations.

关键词： electrostatic atomization MQL nickel-based alloys milling force surface roughness force model

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High-Volume Mineral Admixtures Cement: The Effects of Particle Size Distribution

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 102-108页

作者：黄启珉 WANG Kun LU Jiping YU Jianping SHENG Zhenhua 杨露 State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Fujian Jinniu Cement co. LtdSanming 353300China

The effects of high-volume slag-fly ash cement with different particle sizes on hydration degree,microstructure and mechanical properties were systematically studied,by means of laser particle size(DLS),X-ray diffraction (XRD),co.prehensive thermal analysis (TG-DTA),scanning electron microsco.y(SEM) and mechanical properties *** results show that suitable particle size distribution of cementitious material has significantly promoting effects on hydration reaction rate and mechanical *** with slag without further grinding,the slag after ball milling for 4 h has an obvious improvement in reactivity,which also provides a faster hydration rate and higher co.pressive strength for the cementitious *** the slag milled for 1 and 4 h is mixed at a mass ratio of 2:1 (i e,slag with D_(50) of 7.4μm and average size of 9.9μm,and slag with D_(50) value of 2.6μm and average size of 5.3μm),and a certain amount of fly ash is added in,the most obvious improvement of co.pressive strength of cement is achieved.

关键词： ultrafine slag microstructure co.pressive strength particle size

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柠檬酸协同黄铁矿对煤矸石硅缓释及土壤砷稳定性的影响研究

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Journal of Central South University 2024年第4期31卷 1276-1291页

作者：吕鑫冯胜元占鸿志雷建兰舒自刚周佩雯柴喜林 School of Chemical&Environmental Engineering China University of Mining&Technology(Beijing)Beijing 100083China Jiangxi Gaiya Environment Science and Technology co. Ltd.Shangrao 334000China Central South(Shangrao)Metallurgical Industry Research Institute co. Ltd.Shangrao 334000China School of Resources and Environment Shanxi Agricultural UniversityTaiyuan 030031China

煤矸石是煤炭开采和加工过程中产生的固体废弃物,通常由硅酸盐组成。其在提升硅的生物可利用性方面具有显著潜力,因此可作为农业用硅肥的潜在来源。然而,煤矸石硅的缓释性不足与植物的慢吸收速率存在天然矛盾,限制了煤矸石作为硅肥的应... 详细信息

煤矸石是煤炭开采和加工过程中产生的固体废弃物,通常由硅酸盐组成。其在提升硅的生物可利用性方面具有显著潜力,因此可作为农业用硅肥的潜在来源。然而,煤矸石硅的缓释性不足与植物的慢吸收速率存在天然矛盾,限制了煤矸石作为硅肥的应用。本研究探讨了柠檬酸和黄铁矿对煤矸石中硅的缓释效果,以及由此制备的复合物(C@PC-10)对土壤中砷的固化与稳定化作用。研究结果显示,C@PC-10能有效减缓煤矸石中硅的释放速率,在30 d的实验周期内,土壤中水溶态砷和有效态砷的去除效率分别达到71.3%和55.9%。此外,酸溶态砷的比例降低,而残渣态砷的比例增加。模拟酸雨实验进一步表明C@PC-10能够抑制土壤中砷的溶出。通过X射线衍射(XRD)、X射线光电子能谱(XPS)和傅里叶变换红外光谱(FT-IR)分析,本研究证实了球磨过程中黄铁矿的氧化及其向黄钾铁矾和FeOOH的转化。这些发现揭示了氧化黄铁矿对砷的吸附能力显著增强,表明C@PC-10复合物是一种高效的修复材料,能够调控硅酸盐的释放并有效阻碍土壤中砷的迁移。

关键词：砷煤矸石硅缓释固化稳定化

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Catalytic effects of V-and O-species derived from PrF_(3)/V_(2)C for efficient hydrogen storage in MgH_(2)

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Nano Research 2024年第8期17卷 7117-7125页

作者： Zhenluo Yuan Yuhang Wang Xiuxiu Zhang Shuyan Guan Xiaojiao Wang Liqiang Ji Qiuming Peng Shumin Han Yanping Fan Baozhong Liu co.lege of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454000China Henan Famous Diamond co. Ltd.Mengzhou 454763China School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China co.laborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

Magnesium hydride(MgH_(2))is co.sidered as an ideal hydrogen storage material with excellent hydrogen capacity,but the slow kinetics impedes its ***,an efficient additive of V2C MXene-anchored PrF_(3) nanoparticles(PrF_(3)/V_(2)C)was synthesized,which presents excellent catalytic effect in improving the reversibility and stability of hydrogen storage in MgH_(2).The initial dehydrogenation temperature of the 5 wt.% PrF_(3)/V_(2)C-co.taining MgH_(2)(182℃) is 105℃ lower than that of pure MgH_(2),and 6.5 wt.%hydrogen is rapidly released from 5 wt.%PrF_(3)/V_(2)C-added MgH_(2)sample in 6 min at 240℃.In addition,5 wt.%PrF_(3)/V_(2)C-co.taining MgH_(2) sample possesses outstanding reversible hydrogen storage capability of 6.5 wt.% after 10 cycles of dehydrogenation and *** analysis shows that the introduction of Pr improves the stability of V-species(V^(0)and V^(2+))and O-species(lattice oxygen(OL)and vacancy oxygen(OV))formed during ball milling,promotes the interaction between V-species and O-species,and enhances their reversibility,which co.tributes to the significant improvement in re/dehydrogenation reversibility and cycling stability of MgH_(2).This study provides effective ideas and strategies for the purpose of designing and fabricating high-efficient catalysts for solid-state hydrogen storage materials.

关键词： hydrogen storage materials MgH_(2) dehydrogenation reversibility cyclic stability

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Efflcient machining of a co.plex blisk channel using a disc cutter

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Chinese Journal of Aeronautics 2024年第1期37卷 414-437页

作者： Xiangyu LI Zhaoyu LI Dong HE Junxue REN Qian FENG Kai TANG Department of Mechanical and Aerospace Engineering Hong Kong University of Science and TechnologyHong Kong 999077China Key Laboratory of High Performance Manufacturing for Aero Engine(Northwestern Polytechnical University) Ministry of Industry and Information TechnologyXi’an 710072China Xi’an Sanhang Power Technology co. LtdXi’an 710000China HKUST Shenzhen-Hong Kong co.laborative Innovation Research Institute FutianShenzhen 518057China HKUST Shenzhen Research Institute Shenzhen 518057China

For rough machining of a co.plex narrow cavity,e.g.,a co.plex blisk channel on an aero-engine,the typically used cutting tools are the slender cylindrical cutter and co.ical ***,as neither of the two is particularly suited for rough machining,wherein the main purpose is to remove a large volume as quickly as possible,the machining efficiency is low,especially when the part materials are of hard-to-cut types(e.g.,Titanium-alloy)for which it often takes days to rough machine a ***,disc machining provides a new and efficient roughing solution,since a disc cutter with a large radius enables a much larger cutting speed and thus a larger material removal ***,due to the large radius of the disc cutter,its potential co.lision with narrow and twisted channels beco.es a serious *** this paper,we propose a novel twophase approach for efficiently machining a co.plex narrow cavity workpiece using a disc-shaped cutter,i.e.,3+2-axis disc-slotting of the channel by multiple layers(rough machining)+five-axis disc-milling of the freeform channel side surfaces(semi-finish machining).Both simulation and physical cutting experiments are co.ducted to assess the effectiveness and advantages of the proposed *** experimental results show that,with respect to a same cusp-height threshold on the channel side surfaces,the total machining time of the tested part by the proposed method is about only 36%of that by the co.ventional approach of plunging-milling(for roughing)plus milling by a slender cylindrical cutter(for semi-finishing).

关键词： Blisk channel CNC machining Disc cutter Roughing efficiency Tool path planning

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Improving hydrogen storage thermodynamics and kinetics of Ce-Mg-Ni-based alloy by mechanical milling with TiF_(3)

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Journal of Magnesium and Alloys 2024年第4期12卷 1593-1607页

作者： Hongwei Shang Wei Zhang Xin Wei Yaqin Li Zeming Yuan Jun Li Yanghuan Zhang School of Mechanical and Electrical Engineering Chuzhou UniversityChuzhou 239000China Department of Functional Material Research Central Iron and Steel Research InstituteNo.76 Xueyuannan RoadHaidian DistrictBeijing 100081China Key Laboratory of Integrated Exploitation of Bayan-Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou 014010China China Rare Earth New Material(Weishan)co. Ltd.Jining 277600China

Mg-based hydrides are too stable and the kinetics of hydrogen absorption and desorption is not *** efficient way to improve these shortco.ings is to employ reactive ball milling to synthesize the nanoco.posite materials of Mg and *** this experiment,TiF_(3)was selected as an additive,and the mechanical milling method was employed to prepare the experimental *** alloys used in this experiment were the as-cast Ce_(5)Mg_(85)Ni_(10),as-milled Ce_(5)Mg_(85)Ni_(10)and Ce_(5)Mg_(85)Ni_(10)+3 wt.%*** phase transformation,structural evolution,isothermal and non-isothermal hydrogenation and dehydrogenation performances of the alloys were inspected by XRD,SEM,TEM,Sievert apparatus,DSC and *** revealed that nanocrystalline appeared in the as-milled *** with the as-cast alloy,ball milling made the particle dimension and grain size decrease dramatically and the defect density increase *** addition of TiF_(3)made the surface of ball milling alloy particles markedly co.rser and more *** milling and adding TiF_(3)distinctly improved the activation and kinetics of the ***,ball milling along with TiF_(3)can decrease the onset dehydrogenation temperature of Mg-based hydrides and slightly ameliorate their thermodynamics.

关键词： Mg-based hydrides TiF_(3) Ball milling Thermodynamics Kinetics

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Influence of overhanging tool length and vibrator material on electromechanical impedance and amplitude prediction in ultrasonic spindle vibrator

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第4期25卷 292-310页

作者： Rendi KURNIAWAN Moran XU Min Ki CHOO Shuo CHEN Yein KWAK' Jielin CHEN Saood ALI Hanwei TENG Pil Wan HAN Gi Soo KIM Tae Jo KO Precision Machining Laboratory Department of Mechanical Engineering Yeungnam UniversityGyeongsansiGyeongbuk-doRepublic of Korea Korea Electrotechnology Research Institute(KERI) ChangwonsiGyeongsangnam-doRepublic of Korea KASWIN co. LtdChangwon-siGyeongsangnamdoRepublic of Korea

This study presents the development of an ultrasonic transducer with a radius horn for an ultrasonic milling spindle(UMS)*** ultrasonic transducer was intended to have a working frequency of approximately 30 *** different materials were co.sidered in the study:stainless steel(SS 316L)and titanium alloy(Ti-6Al-4V).Titanium alloy gave a higher resonance frequency(33 kHz)than stainless steel(30 kHz)under the same preload co.pression *** electromechanical impedance simulation was carried out to predict the impedance resonance frequency for both materials,and the effect of the overhanging toolbar was *** to the electromechanical impedance simulation,the overhanging toolbar length affected the resonance frequency,and the error was less than 3%.Harmonic analysis co.firmed that the damping ratio helps determine the resonance ***,damping ratios of 0.015-0.020 and 0.005-0.020 were selected for stainless steel and titanium alloy,respectively,with an error of less than 1.5%.Experimental machining was also performed to assess the feasibility of ultrasonic-assisted milling;the result was a lesser cutting force and better surface topography of Al 6061.

关键词： Ultrasonic spindle Ultrasonic vibration assisted-milling(UVAM) 1-degree of freedom(DOF) Frequency Amplitude milling

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Study of Interaction between Supersonic Flow and Rods or Jets Surrounded by Porous Cavity

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Open Journal of Fluid Dynamics 2012年第4期2卷 337-342页

作者： Nao Kuniyoshi Minoru Yaga Akito Koda Isao Teruy Masaaki Ishikawa Department of Mechanical System Engineering University of the Ryukyus Okinawa Japan Graduate School of Engineering and Science University of the Ryukyus Okinawa Japan makino milling machine co. Ltd. Tokyo Japan

In this experiment, the effects of the co.bination of jets or rods and a porous cavity on the supersonic flow field are studied by means of visualization of schlieren method and the measurements of wall static pressures and the flow direction in the cavity with the thermal tuft probe. Three cases of jets or rods arrangements are tested in the experiments. As a result, a bow shock wave which is generated by the jets or rods is observed by mean of schlieren method. And it is co.firmed that the expansion region appears downstream of the rods but is not in case of the jets pattern. Moreover the pressure ratios of starting shock wave passing through porous cavity for jets pattern differ from that of rods pattern. In the cavity, the flow direction at the measurement position in the cavity is always opposite to the main flow, as long as the starting shock wave is located upstream of the porous cavity for all cases. Difference in the backward flow ratio between the jets and rods patterns is observe after the starting shock wave passes through the porous cavity.

关键词： Shock Wave co.pressible Flow Porous Cavity Bow Shock Wave

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Improving antioxidant activities of water-soluble lignin-carbohydrate co.plex isolated from wheat stalk through prolonging ball-milling pretreatment and homogeneous extraction

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Journal of Bioresources and Bioproducts 2024年第1期9卷 113-125页

作者： Di Xie Zhulan Liu Yunfeng Cao Sheng-I Yang Chen Su Mi Li Jiangsu co.innovation Center for Efficient Processing and Utilization of Forest Products Nanjing Forestry UniversityNanjing 210037China International Innovation Center for Forest Chemicals and Materials Nanjing Forestry UniversityNanjing 210037China Center for Renewable Carbon School of Natural ResourcesUniversity of TennesseeKnoxvilleTN 37996USA Shandong Huatai Paper co. Ltd.Dongying 257000China School of Natural Resources University of TennesseeKnoxvilleTN 37996USA Key Lab of Biomass Energy and Material Institute of Chemical Industry of Forest ProductsChinese Academy of ForestryJiangsu ProvinceNanjing 210042China

Water-soluble lignin-carbohydrate co.plex(LCC)rich in polysaccharides exhibits benign in vitro antioxidant activities and distinguishes high bioco.patibility from lignin-rich LCC and ***,the antioxidant activity of water-soluble LCCs remains to be improved and its structure-antioxidant relationship is still ***,structurally diversified water-soluble LCCs were isolated under different ball-milling pretreatment durations(4,6,8 h),extraction pathways(ho-mogeneous and heterogeneous),and isolation routines(water extracts and residues after water extraction).Their structures were characterized by wet chemistry,chromatography and *** activities were evaluated by ferric reducing antioxidant power and 1,1-diphenyl-2-picrylhydrazyl radicals scavenging rate(RDPPH).Results show that altering ball-milling duration and isolation procedures cause varied structures and antioxidant activities of the water-soluble ***,prolonging ball-milling duration to 8 hours and homogeneous extrac-tion can enhance their antioxidant activity through releasing more phenolic structures and pro-moting the extraction of high-molecular-weight LCCs via reducing mass-transfer resistance,*** a result,the RDPPH of water-soluble LCCs reaches up to 97.35%,which is associated with the arabinan co.tent with statistical significance(P<0.05).This study provides new insights into the structure-antioxidation relationship of herbaceous LCC as potential antioxidants.

关键词： LCC Homogeneous extraction Ball-milling Structure-antioxidation relationship Wheat straw

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日本makino模具集成制造技术的最新动态

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世界制造技术与装备市场 2005年第6期 68-69页

作者： Soichiro Isago makino milling machine TokyoJapan

本文介绍了makino在模具(Die&Mold)制造技术领域的最新进展,该技术涵盖了模具集成加工过程中的整个环节,包括:单元控制器、电极成形系统、铣床、电火花加工CAM、电火花成形加工机和电火花线切割机。makino的单元控制器负责处理全部的信... 详细信息

本文介绍了makino在模具(Die&Mold)制造技术领域的最新进展,该技术涵盖了模具集成加工过程中的整个环节,包括:单元控制器、电极成形系统、铣床、电火花加工CAM、电火花成形加工机和电火花线切割机。makino的单元控制器负责处理全部的信息及数据,从而协调模具的制造过程。makino的电极成形系统负责生成高精度的电极模型及其相应的CAM数据。电火花加工CAM系统可生成最佳的加工参数以及数控程序。

关键词：集成制造技术模具 CAM系统电火花线切割机单元控制器电火花加工日本电极模型成形系统电火花成形

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