检索结果-内蒙古大学图书馆

In-situ experiment tests and particulate simulations on powder paving process of additive manufacturing

Particuology 2023年第3期74卷 164-172页

作者： Tan Cheng Hui Chen Qing Teng Qingsong Wei State Key Lab of Materials Forming and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Department of Mechanical Engineering National University of SingaporeSingapore117575Singapore

In this work,in-situ experimental tests are first performed to investigate the powder spreading process of additive manufacturing,where different kinds of scrapers and spreading speeds are *** kinetic behaviours of individual powder particles are discussed by discrete element method *** is found that the decrease of inclination angle of the scraper improves the powder pressure and compaction in the spreading process,leading to a denser powder flow and thus a denser powder *** increase of spreading speed also improves the powder pressure and compaction in the spreading ***,the powder flow becomes looser due to the volume dilation,and thus the quality of the paved powder bed *** industrial applications,if the higher powder spreading speed is employed to improve the processing efficiency,the scraper with a smaller inclination angle can be used to ensure the powder bed quality.

关键词： Additive manufacturing Powder paving Packing quality Powder bed Inclination angle In-situ measurement

来源：评论

学校读者我要写书评

暂无评论

Data-driven casting defect prediction model for sand casting based on random forest classification algorithm

引用

China Foundry 2024年第2期21卷 137-146页

作者： Bang Guan Dong-hong Wang Da Shu Shou-qin Zhu Xiao-yuan Ji Bao-de Sun Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Hefei Casting and Forging Factory of Anhui Heli Co. LtdHefei 230000China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China

The complex sand-casting process combined with the interactions between process parameters makes it difficult to control the casting quality,resulting in a high scrap rate.A strategy based on a data-driven model was proposed to reduce casting defects and improve production efficiency,which includes the random forest(RF)classification model,the feature importance analysis,and the process parameters optimization with Monte Carlo *** collected data includes four types of defects and corresponding process parameters were used to construct the RF *** results show a recall rate above 90% for all *** Gini Index was used to assess the importance of the process parameters in the formation of various defects in the RF ***,the classification model was applied to different production conditions for quality *** the case of process parameters optimization for gas porosity defects,this model serves as an experimental process in the Monte Carlo method to estimate a better temperature *** prediction model,when applied to the factory,greatly improved the efficiency of defect *** show that the scrap rate decreased from 10.16% to 6.68%.

关键词： sand casting process data-driven method classification model quality prediction feature importance

来源：评论

学校读者我要写书评

暂无评论

In-situ 3D contour measurement for laser powder bed fusion based on phase guidance

引用

Theoretical & Applied Mechanics Letters 2023年第2期13卷 113-119页

作者： Yuze Zhang Pan Zhang Xin Jiang Siyuan Zhang Kai Zhong Zhongwei Li State Key Lab of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan430074China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen51800China

In-situ layerwise imaging measurement of laser powder bed fusion(LPBF)provides a wealth of forming and defect data which enables monitoring of components quality and powder bed *** high-resolution camera layerwise imaging and image processing algorithms to monitor fusion area and powder bed geometric defects has been studied by many researchers,which successfully monitored the contours of components and evaluated their ***,research for the methods of in-situ 3D contour measurement or component edge warping identification is *** this study,a 3D contour mea-surement method combining gray intensity and phase difference is proposed,and its accuracy is verified by designed *** results show that the high-precision of the 3D contours can be achieved by the constructed energy minimization *** method can detect the deviations of common ge-ometric features as well as warpage at LPBF component edges,and provides fundamental data for in-situ quality monitoring tools.

关键词： Laser powder bed fusion In-situ measurement Active contours 3D contour Measurement accuracy

来源：评论

学校读者我要写书评

暂无评论

Effects of heat treatments on microstructures of TiAl alloys

引用

International Journal of Minerals,Metallurgy and materials 2022年第6期29卷 1225-1230页

作者： Wen Yu Jianxin Zhou Yajun Yin Zhixin Tu Xin Feng Hai Nan Junpin Lin Xianfei Ding State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and TechnologyWuhan 430074China Cast Titanium Alloy R&D Center Beijing Institute of Aeronautical MaterialsBeijing 100095China Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology Beijing 100095China Beijing Institute of Aeronautical Materials Co. Ltd.Beijing 100094China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

This study aims to investigate the effects of heat treatments on the microstructure ofγ-TiAl *** Ti-47Al-2Cr-2Nb alloy ingots were manufactured by casting method and then heat-treated in two types of heat *** microstructures were studied by both optical and scanning electron *** chemical compositions of two ingots were determined as *** ingot with lower Al content only obtains lamellar structures while the one higher in Al content obtains nearly lamellar and duplex structures after heat treatment within1270 to 1185℃.A small amount of B2 phase is found to be precipitated in both as-cast and heat-treated *** are distributed at grain boundaries when holding at a higher temperature,such as 1260℃.However,B2 phase is precipitated at grain boundaries and in colony interiors simultaneously after heat treatments happened at 1185℃.Furthermore,the effects of heat treatments on grain refinement and other microstructural parameters are discussed.

关键词： TiAl alloys microstructure heat treatment casting

来源：评论

学校读者我要写书评

暂无评论

Parametric modeling and simulation analysis of porous materials prepared by 3D printing technology

引用

International Journal for simulation and Multidisciplinary Design Optimization 2025年 16卷

作者： Li, Tianhua Ma, Hailong Xu, Shubo Liu, Renhui Pan, Yuefei Ren, Guocheng Li, Jianing Zhao, Zhongkui Shandong Jianzhu University School of Materials Science and Engineering Jinan250101 China Huazhong University of Technology State Key Laboratory of Material Forming and Mould & Die Technology Wuhan430025 China

The study in this paper is the modeling as well as simulation analysis of porous materials prepared by 3D printing technique. The structural simulation analysis of porous material is carried out using ANSYS Workbench 15.0 to derive the deformation as well as stress distribution. Based on the simulation results the equivalent elastic modulus of the porous material is calculated under the homogenization theory. The effect of different parameters on the mechanical properties of the porous material is analyzed, and the most suitable model parameters are compared with the elastic modulus of human bone. The analysis results show that the main factor affecting the mechanical properties of porous materials is the porosity, and the secondary factor is the properties of the materials themselves. The nickel-based alloy tetrahedral porous material can reach the level of human cortical bone when the porosity reaches 70-87%, and the titanium alloy tetrahedral porous material can reach the range of 60-70% porosity. When the porosity of titanium alloy tetrahedral porous material reaches 87% level, it can reach the level of human cancellous bone. © T. Li et al., Published by EDP Sciences, 2025.

关键词： Titanium alloys

来源：评论

学校读者我要写书评

暂无评论

Parameters analysis and process optimization of shell precision thermoforming

引用

International Journal for simulation and Multidisciplinary Design Optimization 2025年 16卷

作者： Cheng, Haozhe Xu, Shubo Sun, Kangwei Wang, Shengliang Pan, Yuefei Ma, Hailong Ren, Guocheng Li, Jianing Zhao, Zhongkui Shandong Jianzhu University School of Materials Science and Engineering Jinan250101 China Huazhong University of Technology State Key Laboratory of Material Forming and Mould & Die Technology Wuhan430025 China

In this study, the aluminium alloy shell forming process is firstly studied and analysed. After that, the three-dimensional modelling software SOLIDWORKS is used to analyse and model the workpieces and the convex and concave dies of each process of the aluminium alloy shell hot extrusion forming process. Finally, the three-dimensional finite element numerical simulation software DEFORM-3D is used to carry out numerical simulation analysis on the precision hot forming process of aluminium alloy shell. Equivalent force and strain distributions, along with stroke-load curves, were analyzed under varying conditions by changing the friction factor and forming temperature. The simulation results show that under the conditions of friction factor of 0.25 and temperature of 450°C, it is most suitable for the machining of aluminium alloy shell hot extrusion forming process. © H. Cheng et al., Published by EDP Sciences, 2025.

关键词： Thermoforming

来源：评论

学校读者我要写书评

暂无评论

Finite Element simulation Analysis of Transmission Line Aeolian Vibration Prevention Effect Based on Energy Balance Method 4

Finite Element Simulation Analysis of Transmission Line Aeol...

引用

4th International Conference on Power and Energy technology, ICPET 2022

作者： Zhao, Jianli Wang, Yilin Yang, Bo Wang, Lei Co. Ltd. Hohhot China University of Science and Technology State Key Lab of Materials Processing and Die and Mould Technology Huazhong Wuhan China

ISBN: (数字)9781665480796

ISBN: (纸本)9781665480796

With the acceleration of power construction, the span adopted by transmission lines has increased, and its vibration under the action of breeze is more serious, which puts forward higher requirements for the design of aeolian vibration prevention of transmission lines. In order to solve the problem that the current energy balance method is difficult to meet the needs of high-voltage engineering construction. Starting with the three key powers of energy balance method: wind energy input power, self damping power of transmission line and power consumed by vibration damper, this paper improves the traditional aeolian vibration analysis method, and uses the modified vibration equation of transmission line vibration damper system to select FR3 vibration damper as the calculation model case. The dynamic bending strain with or without damper in different span ranges of 200~800m is calculated by numerical simulation. The results show that the installation of FR-3 damper has a good effect on preventing aeolian vibration of transmission lines with different spans. The maximum flying frequency of vibration is 15Hz~30Hz, and the maximum dynamic bending strain is 20μϵ, The simulation results can guide the practical application of anti vibration hammer in aeolian vibration line. © 2022 IEEE.

关键词： Electric lines

来源：评论

学校读者我要写书评

暂无评论

Effect of solution treatment time on plasticity and ductile fracture of 7075 aluminum alloy sheet in hot stamping process

引用

Transactions of Nonferrous Metals Society of China 2022年第11期32卷 3516-3533页

作者： Hui-cheng GENG Yi-lin WANG Bin ZHU Zi-jian WANG Yi-sheng ZHANG State Key Lab of Materials Processing and Die and Mould Technology Huazhong University of Science and TechnologyWuhan 430074China School of Iron and Steel Soochow UniversitySuzhou 215006China

The effect of solution treatment time on the post-formed plasticity and ductile fracture of 7075 aluminum alloy in the hot stamping process was *** tests were conducted on the specimens subjected to the hot stamping process with different solution treatment *** digital image correlation(DIC)analysis was used to obtain the strain of the *** on the experiments and modeling,the Yld2000-3d yield criterion and the DF2014 ductile fracture criterion were calibrated and used to characterize the anisotropy and fracture behavior of the metal,***,the microstructure of specimens was *** experimental and simulation results indicate that the 7075 aluminum alloy retains distinct anisotropy after the hot stamping process,and there is no obvious effect of extending the solution treatment time on the material ***,it is found that a longer solution treatment time can increase the fracture strain of the aluminum alloy during the hot stamping process,which may be related to the decrease of the second-phase particles size.

关键词： 7075 aluminum alloy hot stamping solution treatment time anisotropy ductile fracture

来源：评论

学校读者我要写书评

暂无评论

Effects of melt ultrasonic treatment and forming processes on thermo-physical properties of sicp/mg and (Sicp+mg2si)/mg composites 21st

Effects of melt ultrasonic treatment and forming processes o...

引用

21st Chinese materials Conference, CMC 2020

作者： Wu, Shusen Guo, Tian Lü, Shulin Guo, Wei Xia, Lanqing State Key Lab of Material’s Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9783035717389

The 10 vol% SiCp/Mg composites were prepared by external addition and stirring-casting method, and the hybrid reinforced (10 vol% SiCp+10 vol% Mg2Si)/Mg composites were prepared by combining in-situ method. The effects of melt ultrasonic treatment (UT) and forming processes on the thermophysical properties of the two composites were studied. The results show that UT can effectively disperse SiC particles in molten magnesium and reduce the casting porosity, while squeeze casting can significantly reduce the porosity of the composites, which can also significantly improve the thermal conductivity. The thermal conductivity (λ) of 10 vol.% SiCp/Mg composites squeeze casted after UT was 135.3 W/(m.K), and the average coefficient of thermal expansion (CTE) was 19.95×10-6 K-1 at 323-373 K. Compared with gravity casting, the λ was increased by 17% and the CTE was reduced by 0.8%. The λ of (SiCp+Mg2Si)/Mg composite squeeze casted after UT was 132.4 W/(m.K), and the CTE was 18.95×10-6 K-1, which is 27% lower than the CTE of pure magnesium. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Thermal expansion

来源：评论

学校读者我要写书评

暂无评论

Effect of energy density on defect evolution in 3D printed Zr-based metallic glasses by selective laser melting

引用

Science China(Physics,Mechanics & Astronomy) 2020年第2期63卷 104-110页

作者： Wei Xing Di Ouyang Zhen Chen Lin Liu School of Materials Science and Engineering and State Key Lab for Materials Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074China State Key Lab for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China

In this study, the defects in 3D printed Zr-based bulk metallic glasses(BMGs) fabricated by selective laser melting(SLM) under different energy densities have been investigated via both experimental and simulation approaches. Different defects, including balling, interlayer pores, open pores and metallurgical pores, are detected in the 3D-printed Zr-based MGs depending on the energy inputs. Balling mainly occurs at a relatively low energy density(E<8.33 J/mm^3) due to the incomplete melting of particles, while interlayer pores and open pores are formed at modest energy densities(E=13.89-16.67 J/mm^3) because of incomplete welding and insufficient filling of molten liquid between layers. Fine metallurgical pores appear on the upper surface at relatively high energy densities(E=20.83-27.78 J/mm^3), which originate from gas escaping from molten pools during rapid solidification of the melt. Computational fluid dynamics(CFD) simulations are carried out to verify the experimental observations. The CFD simulations reveal that the various defects formed in the 3D-printed Zr-based BMG are related to the melt flow behaviours in the molten pools under different energy densities. The present work provides in-depth understandings of defect formation in the SLM process and provides methods for eliminating these defects in order to enhance the mechanical performance of 3D printed BMGs.

关键词： metallic glass selective laser melting defect formation mesoscopic simulation

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：