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Close-coupled nozzle atomization integral simulation and powder preparation using vacuum induction gas atomization technology

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Chinese Physics B 2021年第2期30卷 487-502页

作者： Peng Wang Jing Li Xin Wang Heng-San Liu Bin Fan Ping Gan Rui-Feng Guo Xue-Yuan Ge Miao-Hui Wang Beijing National Innovation Institute of Lightweight Ltd. Beijing 100083China State Key Laboratory for Advanced Forming Technology and Equipment China Academy of Machinery and TechnologyBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China

We simulate the gas-atomization process of a close-coupled annular nozzle for vacuum induction gas atomization at a three-dimensional ***,the relationship between the simulated droplet type and experimentally metallic powder is established by comparing the morphology of droplets with ***,the primary atomization process is described by the volume-of-fluid(VOF)approach,whereas the prediction of powder diameter after secondary atomization is realized by the VOF-Lagrangian *** addition,to completely reflect the breaking and deformation process of the metallic flow,we employ the VOF model to simulate the secondary atomization process of a single ellipsoidal *** results show that the primary atomization process includes the formation of surface liquid film,appearance of serrated ligaments,and shredding of ***,gas recirculation zone plays an important role in formation of the umbrella-shaped liquid *** secondary atomization process is divided into droplet convergence and dispersion stages,and the predicted powder diameter is basically consistent with the *** general,the four main powder shapes are formed by the interaction of five different typical droplets.

关键词： metallic powder close-coupled nozzle two-phase droplet morphology

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Effect of Shell Dwell Time and Cooling Conditions on Shrinkage Defects of Superalloy Turbine Blade in Investment Casting 75

Effect of Shell Dwell Time and Cooling Conditions on Shrinka...

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75th World Foundry Congress, WFC 2024

作者： Zhang, Pan Xiao, Yizhou Wang, Donghong Huang, Zhen Zhu, Guoliang Sun, Baode Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China School of Materials Science and Engineering Shanghai University of Engineering and Technology Shanghai200240 China

This study employed finite element simulation to investigate the effects of the mold dwell time and cooling conditions before melt pouring process on the shrinkage defects of Inconel 718 superalloy turbine blade. The simulation results suggest that with the mold dwell time increasing from 0s to 180s, the shell temperature drops from 1000 °C to 680 °C and the total shrinkage volume increases from 5.19 cm3 to 6.14 cm3, however, the two types of mold shell insulation measures, addition of insulation cotton and sand filling, reduced the shrinkage volume to 3.26 cm3 and 3.76 cm3 respectively. This phenomenon was mainly caused by the mold shell temperature dropping and rising in the superalloy casting. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Turbomachine blades

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A novel correction method to improve the IR measurement accuracy of cutting tool and workpiece temperature 4

A novel correction method to improve the IR measurement accu...

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4th International Conference on advanced Optics and Photonics Research in Engineering, AOPR 2024

作者： Zheng, Lirui Zhao, Jinfu Liu, Zhanqiang Wang, Bing Song, Wenjing School of Mechanical Engineering Shandong University Jinan250061 China State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan250061 China Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education Jinan250061 China Key National Demonstration Center for Experimental Mechanical Engineering Education Jinan250061 China School of Mechanical Electrical & Information Engineering Shandong University Weihai264209 China

ISBN: (纸本)9781510682610

Accuracy measurement of cutting temperature could help to illustrate the influencing mechanisms of cutting heat on the tool wear and machined surface integrity. The infrared (IR) thermal imager is often utilized to measure cutting temperature, but the assumption of one thermal emissivity on the whole scene limits the measurement accuracy of temperature value. In this research, a novel correction method to improve the IR measurement accuracy of cutting temperature was proposed. Firstly, a fast thermal emissivity measurement method was given to determine the suitable thermal emissivity of WC/Co carbide tool and Inconel 718 workpiece. Secondly, the regions of cutting tool and workpiece are identified with an image segmentation method, which is assigned with the determined suitable thermal emissivity to obtain the temperature field. Lastly, the corrected temperature field is verified to be accurate based on the designed simulating experiments. This method could be taken as a potential to improve IR measurement accuracy of temperature in the future. © 2024 SPIE.

关键词： Carbide cutting tools

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Rotary Bending Process and Parameter Optimization of Rectangular Tube with Variable-Section 12th

Rotary Bending Process and Parameter Optimization of Rectang...

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12th International Conference on advanced Materials and Engineering Materials, IcamEM 2023

作者： Zhao, Xinhai Wang, Xinghui Sun, Xingchen Zheng, Chao Jiang, Zhengyi State Key Laboratory of Advanced Equipment and Technology for Metal Forming Shandong University Jinan250061 China Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong2522 Australia China Aviation Lithium Battery Co. Ltd Luoyang471000 China Unit 32128 of the Chinese People’s Liberation Army Jinan250061 China

ISBN: (纸本)9789819735297

Aiming at the bending process of ordinary rectangular tube, the influence of parameters such as friction coefficient, corner radius of tube blank, and rotational speed of bending die on the bending defects was studied. The traditional rotary bending process was improved and proposed the non-mandrel anti-compensation process. For the variable-section rectangular tube, a variable-radius bending die was designed. For a certain size of variable-section rectangular tube, the anti-compensation parameters of each part were optimized. Take the minimum of internal folding and external depression as the optimization goal, the influence law of different parameters was obtained, and two sets of optimization parameters were obtained. Then, the two sets of parameters were analyzed using the comprehensive equilibrium method. Finally, a set of optimal process parameters was obtained. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Tubes (components)

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On-orbit 3D bioprinting for tumor modeling in space

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Trends in Biotechnology 2025年

作者： Fang, Yongcong Hao, Wenshuai Xiong, Zhuo Department of Mechanical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Tribology in Advanced Equipment Beijing100084 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Beijing100084 China Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing Beijing100084 China Beijing100084 China

On-orbit 3D bioprinting offers a more accurate replication of complex tumor environments under space conditions than current 2D and 3D cell models. This technology holds great promise for uncovering regulatory pathways of tumorigenesis and tumor suppression in space, thus accelerating the development of innovative cancer treatments on Earth. © 2025 Elsevier Ltd

关键词： 3D bioprinting cancer therapeutics microgravity space oncology tumor modeling

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Configuration Design of Lower-Mobility Parallel Driving Mechanisms 23rd

Configuration Design of Lower-Mobility Parallel Driving Mech...

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23rd IFToMM China International Conference on Mechanism and Machine Science and Engineering, IFToMM CCMMS 2022

作者： Zhang, Jinzhu Liu, Xinjun Shi, Hanqing Huang, Yangyang Huang, Qingxue The State Key Laboratory of Tribology and Institute of Manufacturing Engineering Department of Mechanical Engineering Tsinghua University Beijing100084 China College of Mechanical and Vehicle Engineering Taiyuan University of Technology Taiyuan030024 China Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment Ministry of Education Taiyuan030024 China

ISBN: (纸本)9789811993978

A type of parallel driving mechanism (PDM) is proposed in this paper. PDM is different from parallel mechanism and hybrid mechanism, which is composed of the operating mechanism, driving mechanism, and connecting joint. Both the operating mechanism and driving mechanism are connected to the frame which can reduce the inertia at the end of the mechanism and improve the dynamic response. Based on the PDM’s concept, configuration design process of lower-mobility PDM is proposed. In this process, the matching procedure between the driving mechanism, operating mechanism and connecting joint in PDM during configuration design is presented. On this basis, the configuration design of 3–5 degrees-of-freedom (DOFs) PDM is carried out. PDM can enrich the types of mechanisms and provide more configuration options for mechanical equipment. The configuration design process provides theoretical support for developing new PDMs and three PDMs has good potential to be used in different application. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Degrees of freedom (mechanics)

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Empirical correction of kinetic model for polymer thermal reaction process based on first order reaction kinetics

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Chinese Journal of Chemical Engineering 2021年第10期34卷 132-144页

作者： Zhaoxiang Zhang Fei Guo Wei Song Xiaohong Jia Yuming Wang State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Joint Research Center for Rubber and Plastic Seals Tsinghua UniversityBeijing 100084China State Key Laboratory of Advanced Forming Technology&Equipment China Academy of Machinery Science&TechnologyBeijing 100044China Tianding Sealing Technology(Beijing)Co. Ltd.Beijing 100072China

Based on the theory of first-order reaction kinetics,a thermal reaction kinetic model in integral form has been *** make the model more applicable,the effects of time and the conversion degree on the reaction rate parameters were *** types of undetermined functions were used to compensate for the intrinsic variation of the reaction rate,and two types of correction methods are *** model was explained and verified using published experimental data of different polymer thermal reaction systems,and its effectiveness and wide adaptability were *** the given kinetic model,only one parameter needs to be *** proposed empirical model is expected to be used in the numerical simulation of polymer thermal reaction process.

关键词： Thermal reaction Polymer processing Reaction kinetics Mathematical modeling Empirical correction

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Numerical Simulation and Optimization of the Casting Process for a 6 MW Large-Scale Wind Turbine Main Frame 75

Numerical Simulation and Optimization of the Casting Process...

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75th World Foundry Congress, WFC 2024

作者： Su, Fei Wang, Donghong Gong, Qianhai Shu, Da Sun, Baode Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China School of Materials Science and Engineering Shanghai University of Engineering Science Shanghai200240 China Zhejiang Jiali Wind Power Technology Co. Ltd. Zhejiang Hangzhou310051 China

This study focuses on the main frame of a 6 MW large-scale wind turbine generator as the research object, utilizing the ProCAST finite element analysis software for numerical simulation and optimization. Through numerical simulation, potential shrinkage and porosity locations in the casting were successfully predicted, which served as the basis for the simulation and optimization of the gating system. The optimized gating system was then applied to practical production at the factory, resulting in the successful casting of main frame products that met the delivery requirements. This research provides an effective method for optimizing the casting process and predicting defects in large-scale wind turbine ductile iron castings, contributing to resource conservation and quality assurance in industrial production. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Nodular iron

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Optimizing microstructure and mechanical properties of heat-treated Al-Zn-Mg-Cu alloy by indirect hot deformation technology

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Journal of Central South University 2022年第11期29卷 3544-3556页

作者： ZHANG Quan-da SUN Fu-zhen LIU Meng LIU Wen-cai State Key Laboratory of Advanced Forming Technology and Equipment(China Academy of Machinery Science&Technology) Beijing 100044China School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite(Shanghai Jiao Tong University) Shanghai 200240China

In this paper,the indirect thermal tensile experiments of 7075 aluminum alloy including the pre-deformation process at room temperature and the final heat tensile process were carried out,the plastic deformation behavior and forming limit of the material in the compound forming process were investigated considering three pre-deformation amounts 4%,9%,14%,two strain rates 0.001 s^(-1),0.01 s^(-1) and four forming temperatures 300℃,350℃,400℃,450℃.In the indirect hot forming process,the material is sensitive to the pre-deformation,strain rate,and forming temperature,when the strain rate is 0.01 s^(-1),the pre-deformation amount is 4%,and the forming temperature is 400℃,respectively,the maximum tensile deformation is 50 ***,taking the process in which the forming temperature is 450℃ as an example,according to the observation of the microstructure appearance of fracture,the fracture type in the hot forming process was judged as the ductile *** analyzing the microstructure of the specimen treated with the quenching and artificial aging process,the eutectic T(AlZnMgCu)phase and α(Al)matrix formed a network of non-equilibrium alpha binary eutectic.

关键词： strain rate pre-deformation forming temperature AA7075 compound tensile

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Rapid Simulation Platform and Application in Investment Casting Process 75

Rapid Simulation Platform and Application in Investment Cast...

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75th World Foundry Congress, WFC 2024

作者： Zhang, Pan Cao, Renchen Wang, Donghong Huang, Zhen Sun, Baode Shanghai Key Laboratory of Advanced High Temperature Materials and Precision Forming Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Shanghai Jiao Tong University Shanghai200240 China School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China School of Materials Science and Engineering Shanghai University of Engineering and Technology Shanghai200240 China

A rapid simulation platform for high-temperature alloy investment casting process was constructed to address the issues of cumbersome process parameter operation and low simulation efficiency in numerical simulation of investment casting. This platform integrates the process from CAD design to CAE simulation, functions such as parameterization of pouring system, design of casting process parameters, and dynamic display of simulation results. It has established 10 types of simulation templates and 237 sets of model libraries, achieving automated and rapid simulation. Taking a certain power turbine casing as an example, using this platform to construct a simulation model, parameter design variables, and result prediction optimization indicators for simulation calculation;The simulation prediction analysis results are consistent with the actual production defects;Simulation efficiency increased by 89.8%. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Investment casting

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