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The Pairing Analysis Improvement of Magnetized Structure in electromagnetic Bulging Process in Case of Tube with Field Shaper

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Journal of electromagnetic Analysis and Applications 2024年第4期16卷 43-67页

作者： Blaise Kevine Lenz Soronga Zhanqian Zhan Jing Liu Jonas Asamoah Mohamed Bangali Bangura Matala Makiese N’kodia Kambani Chrionie Md Jobayer Hossain Yongdong Chen Program Debugging and Design Department Guangdong Lyric Robot Automation Co. Ltd Huizhou China Electrical and Automation Department China Three Gorges University Yichang China Electronic Department Power Electronic Research Center University of Kent Giles Ln Canterbury UK Program Debugging Department Guangdong Lyric Robot Automation Co. Ltd. Huizhou China Electrical and Computer Engineering Department South China University of Technology Guangzhou China World Standardization Certification and Testing Group (Shenzhen) Co. Ltd. Shenzhen China Electrical Engineering-Power System Mapon University Kindu Democratic Republic of Congo Department of Economy Managment School of Management Computer and Telecomunication Rabbat Marocco Materials Visual Calibration Department Guangdong Lyric Robot Automation Co. Ltd. Huizhou China Program Design Department Guangdong Lyric Robot Automation Co. Ltd. Huizhou China

In the current practical science, the accuracy in the formability of metal alloys being the goal when using electromagnetic forming (EMF) technology, which is a high-speed processing technology that uses Lorentz forces to achieve plastic deformation of sheet metal;according to the previous analysis, the results have shown that in most cases, the Lorentz force acting on the workpiece (metal) is not uniform, there are uneven axial deformations of the metal plates which prevent the rapid advancement of today’s technology. In this article, we presented some advanced analyzes which will lead us to improve the technical solution for the problems of non-uniform axial deformations of the metals in the traditional tube electromagnetic forming technology (EMF). A field shaper is used as a practical forming tool to influence the magnetic field and magnetic pressure distribution, thereby improving the forming ability and result during the electromagnetic forming (EMF) process and we see that induced eddy current control is realized by changing the structural parameters of the magnetic field shaper;which improves the strength and controllability of the magnetic force that acts on the workpiece;thereby a greater radial magnetic pressure can be achieved with field shaper than the case without it;the field shaper regulates the electromagnetic force, the distribution of the magnetic pressure decreases, and the uniform force area of the tube increases which effectively enhances the uniform range of the pipe electromagnetic bulging and the electromagnetic induction coupling between the coil and the metallic workpiece is generally required to produce the Lorentz forces. Using COMSOL Multiphysics® simulation software helped us to accurately represent the real world, simulating multiple physical effects that happened in this model during the process.

关键词： electromagnetic forming Field Shaper Lorentz Force Magnetic Pressure Distribution

Study of Magnetic Force Distribution for electromagnetic V-shape Bending forming of Small Size Flat Sheet

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Journal of Harbin Institute of Technology(New Series) 2014年第1期21卷 25-31页

作者： Xiao-Wei Chen Wen-Ping Wang Min Wan Long Pan An-Lin Long Wei-Ren Xiong Cheng-Long Shi Zhong-Yu Zhou School of Mechanical Engineering and Automation Beihang University Institute of Physics Chinese Academy of Sciences Wuhan National High Magnetic Field Center Huazhong University of Science and Technology

electromagnetic V-shape bending of small size sheet blank is investigated numerically and experimentally. Three-dimensional electromagnetic field models are established to calculate the magnetic force distribution on the sheet by software ANSYS / EMAG. Series of electromagnetic V-shape bending forming experiments are presented,in which small size uniform pressure coil and big size round flat spiral coil are used. The results show that small size uniform pressure coil is not suitable for electromagnetic forming of small size flat sheet,and the coil is susceptible to failure such as bulging,ablation and cracking. When the plane dimension of round flat spiral coil is bigger than sheet blank sizes,the induced current crowding effect will be resulted which seriously influence the magnetic force distribution on the sheet. In this case,magnetic force distribution can be adjusted through the change of the relative position between coil and sheet,the desired deformation can be obtained finally. Therefore,big size round flat spiral coil can be well applied to electromagnetic V-shape bending forming of small size flat sheet.

关键词： electromagnetic forming Small size sheet blank Induced current crowding effect Magnetic force distribution

Effect of Various Field Shapers on Magnetic Pressure in electromagnetic Inward Tube forming

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Journal of Iron and Steel Research(International) 2012年第S1期19卷 86-89页

作者： Ehsan Garzan Hossein Ebrahimi Ali Reza Fallahi Arezoodar Department of Mechanical Eng. AMIRKABIR University of TechnologyTehranIran

In this paper,the influence of various field shapers and their shapes on the distribution of the magnetic flux densities and applied forces on the work-piece in the electromagnetic inward tube forming are studied numerically using the FEA software *** the model was verified with experimental results and thereafter four kinds of field shapers(conical,cylindrical,concave and convex)were *** of their geometries,such as air gap between field shaper and tube work-piece,height of the step in single and multiple stepped field shaper on magnetic flux densities and magnetic pressures were *** results of this research can be applied to design field shaper,tube compression technology,and improve the efficiency of the *** is seen that magnetic force decreases if height of step in convex field shaper increases but effective forming region *** air gap has also a positive influence on magnetic field *** the object of this research is limited to field shaper for inward tube forming,the results can also be applied to the field shaper for tube bulging.

关键词： Inward tube forming electromagnetic forming Field shaper Magnetic pressure Geometric parameters

Effects of temperature on the mechanical properties of Ti6Al4V powder compacts prepared by magnetic pulse compaction

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Rare Metals 2010年第3期29卷 302-307页

作者： LI Mini YU Haiping LI Chunfeng School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China

The effects of temperature （0-500°C） on the compressive strength,hardness,average relative density,and microstructure of Ti6Al4V powder green compacts prepared by magnetic pulse compaction were *** results show that with increasing heating temperature,the compressive strength first increases and then decreases with the maximum value of 976.74 MPa at 400°*** average relative density and hardness constantly increase,and their values reach 96.11% and HRA 69.8 at 500°C,*** increase of partial welding is found among the junctions of particles inside the compacts; there is no obvious grain growth inside the compacts within the temperature range.

关键词： powder metallurgy powder compaction magnetic pulse compaction heating temperature relative density electromagnetic forming

Microstructure and mechanical properties of Ti6Al4V powder compacts prepared by magnetic pulse compaction

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Transactions of Nonferrous Metals Society of China 2010年第4期20卷 553-558页

作者：李敏于海平李春峰 School of Materials Science and Engineering Harbin Institute of Technology

Ti6Al4V powder compaction was performed by using magnetic pulse compaction in air at 200℃.Effects of process parameters such as voltage,capacitance,discharge times on the microstructure,compressive strength,hardness and relative density of compacts were *** experimental results show that the relative density,hardness and compressive strength of compacted specimens increase with increasing *** addition,the relative density and compressive strength of compacted specimens increase with the augmentation of capacitance in the range *** relative density increases,the hardness firstly increases and then tends to be a fixed value;and the compressive strength firstly increases and then decreases from one to five times *** values of the hardness and compressive strength reach the maxima of HRA 69.1 and 1 062.31 MPa,at three times compaction,*** are pores in and between particles.

关键词： powder metallurgy Ti6Al4V powder compaction magnetic pulse compaction relative density electromagnetic forming

DYNAMIC COMPACTION OF PURE COPPER POWDER USING PULSED MAGNETIC FORCE

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Acta Metallurgica Sinica(English Letters) 2007年第4期20卷 277-283页

作者： H.P. Yu C.F. Li National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology Harbin 150001 China

The compaction of pure Cu powder was carried out through a series of experiments using dynamic magnetic pulse compaction, and the effects of process parameters, such as discharge energy and compacting direction, on the homogeneity and the compaction density of compacted specimens were presented and discussed. The results indicated that the compaction density of specimens increased with the augment of discharge voltage and time. During unidirectional compaction, there was a density gradient along the loading direction in the compacted specimen, and the minimum compaction density was localized to the center of the bottom of the specimen. The larger the aspect ratio of a powder body, the higher the compaction density of the compacted specimen. And high conductivity drivers were beneficial to the increase of the compaction density. The iterative and the double direction compaction were efficient means to manufacture the homogeneous and high-density powder parts.

关键词： magnetic pulse compaction copper powder compaction density electromagnetic forming

electromagnetic Expansion and Fragmentation of Hollow Aluminium 5052 Tube

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Journal of Minerals and Materials Characterization and Engineering 2020年第6期8卷 421-439页

作者： Hitesh Choudhary Chiradeep Gupta Nirupama Tiwari Tanmay Kolge Rajeev Kapoor Archana Sharma Homi Bhabha National Institute Anushaktinagar Mumbai India Accelerator & Pulse Power Division Bhabha Atomic Research Centre Mumbai India Mechanical Metallurgy Division Bhabha Atomic Research Centre Mumbai India Laser & Plasma Technology Division Bhabha Atomic Research Centre Mumbai India

electromagnetic forming is a high-speed forming technology by which hollow profiles can be compressed or expanded. It is done with a pulsed magnetic field to apply Lorentz’ forces at electrically conductive material. electromagnetic hollow tube expansion is limited by the fragmentation tendency. This work attempts to use a combination of analytical and computational approach to compute the net tangential stress during tube expansion. A simplified analytical framework to estimate the temporal evolution of plastic stresses present in aluminium alloy AA5052 at low and high applied magnetic pressures is developed based upon dynamic imaging. The time resolved images captured using current synchronised high speed camera record the overall dimensional changes of the tube that is validated by multi-physics simulation of expansion process. Imaging of hollow tube expansions at two selected peak currents has been carried out at various current levels in the range 76 - 160 kA. The direct visualisation of the increase in the tube diameter at two current levels provided a comparison of the developing net tangential stresses in the hollow tube during the undamaged and fragmented expansion. Imaging of tube expansion also facilitates the estimation of the strain rate experienced by the tube and was in the range of ~1700 s-1 to ~1200 s-1. The propensity of fragmentation was found to be due to the level and duration of generated tangential stresses above the yield stress during expansion of the aluminium tubes. Presented study provides a mean of exploiting the enhanced formability of aluminium alloys using electromagnetic forming.

关键词： electromagnetic forming Aluminium Alloys High-Speed Imaging

The Research on Micro Electronic-Magnetic forming of Sheet Metal

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Journal of Iron and Steel Research(International) 2012年第S1期19卷 434-437页

作者： ZHAO Qing-juan GUO Bin WANG Chun-ju SHAN De-bin YU Hai-ping LI Chun-feng School of Materials Science and Engineering Harbin Institute of Technology

Micro channel of T2 copper were molding through electronic-magnetic forming *** scanning confocal microscope and contourgraph were used to measure the section profile and sheet *** effects of voltage,shape of channel and discharge cycles on laws of metal flow were *** showed that forming depth of micro channel and thinning of sheet thickness increased as the increasing of the ***-filling capacity of components formed by two molds with different structures had been increased when the voltage was *** with semicircle structure facilitate the material flow and the forming depth of parts was relative *** structure was better than taper structure in mold-filling capacity.A number of small pulse discharges can improve the forming quality and deformation,but local thinning in sheet metal leads to non-uniform distribution of thickness.

关键词： electromagnetic forming array microstructure foil board micro forming micro channel