检索结果-南通市图书馆

Specific grinding energy and surface roughness of nanoparticle jet minimum quantity lubrication in grinding

Chinese Journal of Aeronautics 2015年第2期28卷 570-581页

作者： Zhang Dongkun Li Changhe jia dongzhou Zhang Yanbin Zhang Xiaowei School of Mechanical Engineering Qingdao Technological University

Nanoparticles with the anti-wear and friction reducing features were applied as cooling lubricant in the grinding fluid. Dry grinding, flood grinding, minimal quantity of lubrication （MQL）, and nanoparticle jet MQL were used in the grinding experiments. The specific grinding energy of dry grinding, flood grinding and MQL were 84, 29.8, 45.5 J/mm3, respectively. The speci- fic grinding energy significantly decreased to 32.7 J/mm3 in nanoparticle MQL. Compared with dry grinding, the surface roughness values of flood grinding, MQL, and nanoparticle jet MQL were sig- nificantly reduced with the surface topography profile values reduced by 11%, 2.5%, and 10%, respectively, and the ten point height of microcosmic unflatness values reduced by 1.5%, 0.5%, and 1.3%, respectively. These results verified the satisfactory lubrication effects of nanoparticle MQL. MoS：, carbon nanotube （CNT）, and ZrO2 nanoparticles were also added in the grinding fluid of nanoparticle jet MQL to analyze their grinding surface lubrication effects. The specific grinding energy of MoS2 nanoparticle was only 32.7 J/mm3, which was 8.22% and 10.39% lower than those of the other two nanoparticles. Moreover, the surface roughness of workpiece was also smaller with MoS2 nanoparticle, which indicated its remarkable lubrication effects. Furthermore, the role of MoS2 particles in the grinding surface lubrication at different nanoparticle volume con- centrations was analyzed. MoS2 volume concentrations of 1%, 2%, and 3% were used. Experimental results revealed that the specific grinding energy and the workpiece surface roughness initially increased and then decreased as MoS2 nanoparticle volume concentration increased. Satisfactory grinding surface lubrication effects were obtained with 2% MoS2 nanoparticle volume concentration.

关键词： Grinding Minimal quantity of lubrica-tion (MQL) Nanoparticle Specific grinding energy Surface roughness

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Model for atomization droplet size and energy distribution ratio at the distal end of an electrostatic nozzle

引用

Frontiers of Mechanical Engineering 2024年第5期19卷 33-58页

作者： dongzhou jia Keke jiaNG Yanbin ZHANG Zhenlin LV Changhe LI College of Mechanical Engineering and Automation Liaoning University of TechnologyJinzhou 121001China School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China

Electrostatic atomization minimum quantity lubrication(EMQL)employs the synergistic effect of multiple physical fields to atomize minute quantities of *** innovative methodology is distinguished by its capacity to ameliorate the atomization attributes of the lubricant substantially,which subsequently augments the migratory and infiltration proficiency of the droplets within the complex and demanding milieu of the cutting *** with the traditional minimum quantity lubrication(MQL),the EMQL process is further complicated by the multiphysical field *** presence of multiple physical fields not only increases the complexity of the forces acting on the liquid film but also induces changes in the physical properties of the lubricant itself,thus making the analysis of atomization characteristics and energy distribution particularly *** address this objective reality,the current study has conducted a meticulous measurement of the volume average diameter,size distribution span,and the percentage concentration of inhalable particles of the charged droplets at various intercept positions of the EMQL nozzle.A predictive model for the volume-averaged droplet size at the far end of the EMQL nozzle was established with the observed statistical value F of 825.2125,which indicates a high regression accuracy of the ***,based on the changes in the potential energy of surface tension,the loss of kinetic energy of gas,and the electric field work at different nozzle orifice positions in the EMQL system,an energy distribution ratio model for EMQL was *** energy distribution ratio coefficients under operating conditions of 0.1 MPa air pressure and 0 to 40 kV voltage on the 20 mm cross-section ranged from 3.094‰to 3.458‰,while all other operating conditions and cross-sections had energy distribution ratios below 2.06‰.This research is expected to act as a catalyst for the progression of EMQL by stimulating innovation in the sp

关键词： atomization performance EMQL energy distribution PIV observation sustainable manufacturing

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Grinding temperature and energy ratio coefficient in MQL grinding of high-temperature nickel-base alloy by using different vegetable oils as base oil

引用

Chinese Journal of Aeronautics 2016年第4期29卷 1084-1095页

作者： Li Benkai Li Changhe Zhang Yanbin Wang Yaogang jia dongzhou Yang Min School of Mechanical Engineering Qingdao Technological University

Vegetable oil can be used as a base oil in minimal quantity of lubrication (MQL). This study compared the performances of MQL grinding by using castor oil, soybean oil, rapeseed oil, corn oil, sunflower oil, peanut oil, and palm oil as base oils. A K-P36 numerical-control precision surface grinder was used to perform plain grinding on a workpiece material with a high-temperature nickel base alloy. A YDM-III 99 three-dimensional dynamometer was used to measure grinding force, and a clip-type thermocouple was used to determine grinding temperature. The grinding force, grinding temperature, and energy ratio coefficient of MQL grinding were compared among the seven vegetable oil types. Results revealed that (1) castor oil-based MQL grinding yields the lowest grinding force but exhibits the highest grinding temperature and energy ratio coefficient; (2) palm oil-based MQL grinding generates the second lowest grinding force but shows the lowest grinding temperature and energy ratio coefficient; (3) MQL grinding based on the five other vegetable oils produces similar grinding forces, grinding temperatures, and energy ratio coefficients, with values ranging between those of castor oil and palm oil; (4) viscosity significantly influences grinding force and grinding temperature to a greater extent than fatty acid varieties and contents in vegetable oils; (5) although more viscous vegetable oil exhibits greater lubrication and significantly lower grinding force than less viscous vegetable oil, high viscosity reduces the heat exchange capability of vegetable oil and thus yields a high grinding temperature; (6) saturated fatty acid is a more efficient lubricant than unsaturated fatty acid; and (7) a short carbon chain transfers heat more effectively than a long carbon chain. Palm oil is the optimum base oil of MQL grinding, and this base oil yields 26.98 N tangential grinding force, 87.10 N normal grinding force, 119.6 degrees C grinding temperature, and 42.7% energy ratio coeffi

关键词： Base oil Carbon chain length Energy ratio coefficient Grinding force Grinding temperature MQL grinding Vegetable oil Viscosity

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Prediction model of volume average diameter and analysis of atomization characteristics in electrostatic atomization minimum quantity lubrication

引用

Friction 2023年第11期11卷 2107-2131页

作者： dongzhou jia Changhe LI jiahao LIU Yanbin ZHANG Min YANG Teng GAO Zafar SAID Shubham SHARMA School of Mechanical&Automotive Engineering Qingdao University of TechnologyQingdao 266520China College of Mechanical Engineering and Automation Liaoning University of TechnologyJinzhou 121001China State Key Laboratory of Ultra-precision Machining Technology Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic UniversityHong Kong 999077China College of Engineering University of SharjahSharjah 27272United Arab Emirates Mechanical Engineering Department University Center for Research and DevelopmentChandigarh UniversityMohaliPunjab 144603India

Minimum quantity lubrication(MQL)is a relatively efficient and clean alternative to flooding workpiece *** atomization has the merits of small droplet diameter,high uniformity of droplet size,and strong coating,hence its superiority to pneumatic ***,as the current research hotspot,the influence of jet parameters and electrical parameters on the average diameter of droplets is not ***,by observing the shape of the liquid film at the nozzle outlet,the influence law of air pressure and voltage on liquid film thickness(h)and transverse and longitudinal fluctuations are ***,the mathematical model of charged droplet volume average diameter(VAD)is constructed based on three dimensions of the liquid film,namely its thickness,transverse wavelength(λ_(h)),and longitudinal wavelength(λ_(z)).The model results under different working conditions are obtained by numerical *** of the model results with the experimental VAD of the droplet confirm the error of the mathematical model to be less than 10%.The droplet diameter distribution span value Rosin–Rammler distribution span(R.S)and percentage concentrations of PM10(particle size of less than 10μm)/PM2.5(particle size of less than 2.5μm)under different working conditions are further *** results show that electrostatic atomization not only reduces the diameter distribution span of atomized droplets but also significantly inhibits the formation of PM10 and PM2.5 fine-suspension *** the air pressure is 0.3 MPa,and the voltage is 40 kV,the percentage concentrations of PM10 and PM2.5 can be reduced by 80.72%and 92.05%,respectively,compared with that under the pure pneumatic atomization condition at 0.3 MPa.

关键词： minimum quantity lubrication(MQL) electrostatic atomization volume average diameter(VAD) atomization characteristics

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Topography Modeling of Surface Grinding Based on Random Abrasives and Performance Evaluation

引用

CHINESE JOURNAL OF MECHANICAL ENGINEERING 2024年第1期37卷 1-23页

作者： Zhang, Yanbin Gong, Peng Tang, Lizhi Cui, Xin jia, dongzhou Gao, Teng Dambatta, Yusuf Suleiman Li, Changhe Qingdao Univ Technol Key Lab Ind Fluid Energy Conservat & Pollut Contro Minist Educ Qingdao 266520 Peoples R China Xian Univ Technol Sch Mat Sci & Engn Xian 710048 Peoples R China Liaoning Univ Technol Coll Mech Engn & Automation Jinzhou 121001 Peoples R China Ahmadu Bello Univ Mech Engn Dept Zaria 810106 Nigeria

The surface morphology and roughness of a workpiece are crucial parameters in grinding processes. Accurate prediction of these parameters is essential for maintaining the workpiece's surface integrity. However, the randomness of abrasive grain shapes and workpiece surface formation behaviors poses significant challenges, and accuracy in current physical mechanism-based predictive models is needed. To address this problem, by using the random plane method and accounting for the random morphology and distribution of abrasive grains, this paper proposes a novel method to model CBN grinding wheels and predict workpiece surface roughness. First, a kinematic model of a single abrasive grain is developed to accurately capture the three-dimensional morphology of the grinding wheel. Next, by formulating an elastic deformation and formation model of the workpiece surface based on Hertz theory, the variation in grinding arc length at different grinding depths is revealed. Subsequently, a predictive model for the surface morphology of the workpiece ground by a single abrasive grain is devised. This model integrates the normal distribution model of abrasive grain size and the spatial distribution model of abrasive grain positions, to elucidate how the circumferential and axial distribution of abrasive grains influences workpiece surface formation. Lastly, by integrating the dynamic effective abrasive grain model, a predictive model for the surface morphology and roughness of the grinding wheel is established. To examine the impact of changing the grit size of the grinding wheel and grinding depth on workpiece surface roughness, and to validate the accuracy of the model, experiments are conducted. Results indicate that the predicted three-dimensional morphology of the grinding wheel and workpiece surfaces closely matches the actual grinding wheel and ground workpiece surfaces, with surface roughness prediction deviations as small as 2.3%.

关键词： Surface topography prediction Grinding Grinding wheel model Random plane method

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Milling surface roughness for 7050 aluminum alloy cavity influenced by nozzle position of nanofluid minimum quantity lubrication

引用

Chinese Journal of Aeronautics 2021年第6期34卷 33-53页

作者： Zhenjing DUAN Changhe LI Yanbin ZHANG Lan DONG Xiufang BAI Min YANG dongzhou jia Runze LI Huajun CAO Xuefeng XU School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China School of Mechanical and Electrical Engineering Qingdao Binhai UniversityQingdao 266555China School of Mechanical Engineering Inner Mongolia University for NationalitiesTongliao 028000China Department of Biomedical Engineering University of Southern CaliforniaCA90089-1111 Los AngelesU.S.A. State Key Laboratory Mechanical Transmiss Chongqing UniversityChongqing 400044China Zhejiang University of Technology Hangzhou 310032China

In nanofluid minimum quantity lubrication(NMQL)milling of aviation aluminum alloy,it is the bottleneck problem to adjust the position parameters(target distance,incidence angle,and elevation angle)of the nozzle to improve the surface roughness of milling,which has large and uncontrollable *** this paper,the influence law of milling cutter speed,helical angle,and cavity shape on the flow field around the milling cutter was studied,and the optimal nozzle profile parameters were *** 7050 aluminum alloy as the workpiece material,the milling experiment of the NMQL cavity was conducted by utilizing cottonseed oil-based Al2 O3 *** show that the high velocity of the surrounding air flow field and the strong gas barrier could be attributed to high rotating velocities of the milling *** incidence angle of the nozzle was consistent with the helical angle of the milling cutter,the target distance was appropriate at 25–30 mm,and the elevation angle was suitable at 60°–65°.The range and variance analyses of the signal-to-noise ratio of milling force and roughness were performed,and the chip morphology was observed and *** results show that the optimal combination of nozzle position parameters was the target distance of 30 mm,the incidence angle of 35°,and the elevation angle of 60°.Among these parameters,target distance had the largest impact on cutting performance with a contribution rate of more than 55%,followed by incidence angle and elevation contribution *** by orthogonal experiment revealed that the nozzle position parameters were appropriate,and Ra(0.087 lm)was reduced by 30.4%from the maximum value(0.125 lm).Moreover,Rsm(0.05 mm)was minimum,which was 36%lower than that of the seventh group(Rsm=0.078 mm).

关键词： 7050 aluminum alloy Milling Milling force Nanofluid minimum quantity lubrication Nozzle position Orthogonal experimental Roughness SNR

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nano-enhanced biolubricant in sustainable manufacturing:From processability to mechanisms

引用

Friction 2022年第6期10卷 803-841页

作者： Yanbin ZHANG Hao Nan LI Changhe LI Chuanzhen HUANG Hafiz Muhammad ALI Xuefeng XU Cong MAO Wenfeng DING Xin CUI Min YANG Tianbiao YU Muhammad JAMIL Munish Kumar GUPTA dongzhou jia Zafar SAID School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China School of Aerospace University of Nottingham Ningbo ChinaNingbo 315100China School of Mechanical Engineering Yanshan UniversityQinhuangdao 066004China Mechanical Engineering Department King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia Key Laboratory of Special Purpose Equipment and Advanced Processing Technology Ministry of Education&Zhejiang ProvinceZhejiang University of TechnologyHangzhou 310032China College of Automotive and Mechanical Engineering Changsha University of Science and TechnologyChangsha 410114China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Mechanical Engineering&Automation Northeastern UniversityShenyang 110006China Industrial Engineering Department University of Engineering and Technology TaxilaTaxila 47080Pakistan School of Mechanical Engineering Shandong UniversityJinan 250061China College of Mechanical Engineering and Automation Liaoning University of TechnologyJinzhou 121001China College of Engineering University of SharjahSharjah 27272United Arab Emirates

To eliminate the negative effect of traditional metal-working fluids and achieve sustainable manufacturing,the usage of nano-enhanced biolubricant(NEBL)is widely researched in minimum quantify lubrication(MQL)***'s improved tool wear and surface integrity have been preliminarily verified by experimental *** previous review papers also concluded the major influencing factors of processability including nano-enhancer and lubricant types,NEBL concentration,micro droplet size,and so ***,the complex action of NEBL,from preparation,atomization,infiltration to heat transfer and anti-friction,is indistinct which limits preparation of process specifications and popularity in *** in the complex machining process,in-depth understanding is difficult and *** fll this gap,this paper concentrates on the comprehensive quantitative assessment of processability based on tribological,thermal,and machined surface quality aspects for NEBL application in turning,milling,and *** it attempts to answer mechanisms systematically considering multi-factor influence of molecular structure,physicochemical properties,concentration,and ***,this paper reveals advanced lubrication and heat transfer mechanisms of NEBL by quantitative comparison with biolubricant-based MQL ***,the distinctive filmformation,atomization,and infiltration mechanisms of NEBL,as distinguished from metal-working fluid,are clarified combining with its unique molecular structure and physical ***,the process optimization strategy is concluded based on the synergistic relationship analysis among process variables,physicochemical properties,machining mechanisms,and performance of ***,the future development directions are put forward aiming at current performance limitations of NEBL,which requires improvement on preparation and jet methods *** paper will help scientists deeply understand effective mec

关键词： nano-enhanced biolubricant(NEBL) sustainable manufacturing minimum quantity lubrication(MQL) tribological properties machining mechanisms

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Erratum to:Nano-enhanced biolubricant in sustainable manufacturing:From processability to mechanisms

引用

Friction 2023年第5期11卷 836-837页

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research on Three-Dimensional Simulation of the Internal Arc Gear Skiving

引用

Mechanical Engineering Science 2024年第1期6卷 35-40页

作者： Xiaoqiang WU Rui XUE Erkuo GUO dongzhou jia Taiyan GONG Zengrong LI Haijun YANG Xiaoxue LI Xin jiaNG Shuai DING Yong LIU Shitian LI School of Mechanical and Traffic Engineering Ordos Institute of TechnologyOrdosInner Mongolia017000China Tianjin TANHAS Technology Co. LTDTianjin301600China School of Mechanical Engineering Jiangsu UniversityZhenjiangJiangsu212002China College of Mechanical Engineering and Automation Liaoning University of TechnologyJinzhouLiaoning121001China Inner Mongolia Ruite Precision Mould Co. LTD.The First Machinery GroupBaotouInner Mongolia014030China Inner Mongolia University Of Technology College Of Energy And Power EngineeringHohhotInner Mongolia010051China

Aiming at the problems that the simulation accuracy which is reduced due to the simplification of the model,a three-dimensional simulation method based on solid modeling is being *** analyzing the motion relationship and positional relationship between the caries knife and the workpiece,the coordinate system of the caries machining was *** the MATLAB software,the cutting edge model and the blade sweeping surface model of the boring cutter are sequentially *** operation is performed on the blade swept surface formed by the tooth cutter teeth with time t and the workpiece tooth geometry as well as the undeformed three-dimensional chip geometry model and the instantaneous cogging geometry model are obtained at different *** the compare between gear end face simulation tooth profile and the theoretical inner arc tooth profile,we verified the accuracy and rationality of the proposed method.

关键词： gear skiving undeformed three-dimensional chips solid modeling

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

神经外科颅骨磨削温度场预测新模型

引用

机械工程学报 2018年第23期54卷 215-222页

作者：杨敏李长河张彦彬贾东洲张仙朋李润泽青岛理工大学机械工程学院青岛266520 南加州大学生物医学工程系美国洛杉矶CA90089-1111

基于恒定热流密度的温度场理论计算值与实际温度值的误差较大,是当前磨削温度场理论研究的瓶颈。建立了不同冷却条件下的对流换热系数及材料内部的热传导模型,通过实时采集动态磨削力,利用高次高斯函数拟合建立了动态热流密度模型,并以... 详细信息

基于恒定热流密度的温度场理论计算值与实际温度值的误差较大,是当前磨削温度场理论研究的瓶颈。建立了不同冷却条件下的对流换热系数及材料内部的热传导模型,通过实时采集动态磨削力,利用高次高斯函数拟合建立了动态热流密度模型,并以此为基础建立了神经外科骨磨削温度场预测新模型。在干式磨削、喷雾式及纳米粒子射流喷雾式冷却条件下对骨磨削温度场进行了数值分析,并采用与人体颅骨力学性能最相近的新鲜牛股骨密质骨,采用羟基磷灰石纳米粒子及生理盐水进行了试验验证。结果表明,与试验测得温度值相比,采用基于恒定热流密度的温度场模型计算的温度值误差为18.8%,而采用新模型计算的温度值误差为6.6%,理论分析与试验结果吻合,即骨磨削温度场预测新模型更符合实际工况。

关键词：外科颅骨磨削动态热流密度温度场仿真喷雾式冷却羟基磷灰石

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：