共查询到18条相似文献,搜索用时 406 毫秒
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磁场力分析是电磁成形理论分析的基础,其分析结果直接用于工件的变形分析.应用FEA软件ANSYS对平板件电磁成形磁场进行数值计算,分析了板坯上磁场分布特点及放电电压和脉冲电流频率对磁场力的影响.进行了锥形件电磁成形试验,验证了有限元模拟方法用于平板件电磁成形磁场力模拟的有效性. 相似文献
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以锻钢曲拐为研究对象,运用Deform-3D模拟软件中的成形模块对锻件模锻成形变形过程进行数值模拟,分析锻件毛坯在成形过程中的等效应力、等效应变和成形力。通过对锻后的锻件毛坯与工件进行对比,为曲拐模锻成形提供理论依据。 相似文献
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在简述了平板件电磁成形原理的基础上,从以下4个方面综述了此技术的国内外研究进展:成形线圈设计方面,列举了平板线圈,匀压力线圈,并列线圈以及工艺校形线圈的使用;磁场力计算方面,讲述了解析法和有限元法的应用;试验研究方面,阐述了电磁成形板材成形性能研究、电磁辅助成形研究的进展;数值模拟方面,叙述了各种数值模拟方法以及有限元软件的应用。最后,指出了平板件电磁成形技术推广过程中所需攻克的技术难题。 相似文献
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Huang Shangyu Chang Zhihua Wang Zhongren Wang Lifeng Yang Mei School of Materials Engineering Wuhan Automotive Polytechnic University Wuhan P. R. China School of Materials Science Engineering Harbin Institute of Technology 《中国有色金属学会会刊》1998,(3)
1INTRODUCTIONElectromagneticforming,esentialybeingakindofapplicationofimpulseintensivecurenttechniqueinmetalworking,dealswith... 相似文献
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Wenyong Luo Liang HuangJianjun Li Xianlong LiuZhiqiang Wang 《Journal of Materials Processing Technology》2014,214(11):2811-2819
A driving coil is one significant tool for transferring electrical energy to plastic energy during electromagnetic forming, and the coil structure plays a crucial role on the distribution of magnetic field and electromagnetic force acting on the workpiece and determines the forming characteristics and magnitude. Due to the limitation of the conventional coil on forming a large and thick-walled component, this paper proposes a novel multi-layer flat spiral coil for large and thick sheets based on theoretical analysis of the relations of coil inductance, skin depth of sheets and energy efficiency. Taking electromagnetic flanging forming of a large and thick-walled sheet for example, a 3D numerical model is developed to investigate the effects of coil structure on magnetic field and sheet forming. Finally, several electromagnetic flanging experiments with 5 mm 5056 aluminum alloy sheets by a three-layer coil are carried out to validate the simulation results and a comparison of the thickness distribution and the fittability degree between the die and the sheet after one-time and two-time forming is performed. The results show that the magnetic force loading on the workpiece increases obviously with the increase of the coil layer owing to the additive effect of each layer of the multi-layer coils, and further enlarges the deformation, while the pressure acting on the coils can be controlled effectively due to the share of each layer of the multi-layer coils. The energy efficiency of the multi-layer coils increases with the increase of the skin depth and peaks at 19.6% when the skin depth is equal to the sheet thickness. The experimental results of electromagnetic flanging based on a three-layer coil coincide with the simulation results. 相似文献
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Electromagnetic incremental forming (EMIF): A novel aluminum alloy sheet and tube forming technology
《Journal of Materials Processing Technology》2014,214(2):409-427
Large parts cannot be shaped by conventional electromagnetic forming method due to the limitation of the strength of working coil and the capacity of capacitor bank. In this paper, based on the principle of single point incremental forming, a new method named electromagnetic incremental forming (EMIF) has been proposed. The method makes use of a small coil and small discharge energy to cause workpiece local deformation in a high speed. Finally, all local deformations accumulate into large parts. For the electromagnetic incremental sheet forming, the effect factors of processing parameters namely discharge voltage, vent hole, discharging times in a fixed position and the number of discharge region, on final sheet shape are investigated by using AA3003 aluminum alloy parts. In addition, two different simulation strategies are proposed to predict electromagnetic incremental sheet and tube forming process. For method 1: the technology like “birth–death element” is used to indirectly describe the movement of the coil and the morphing technology is used to make the air change with the workpiece deformation. For method 2: the coil can directly move to a special position and the remesh technology is used to consider the effect of the workpiece deformation and the movement of coil on magnetic analysis. It is found that method 1 cannot be used for electromagnetic incremental sheet forming process if overlap region exists in two adjacent discharge regions. However, method 1 can successfully predict electromagnetic incremental tube forming. And method 2 can be used for electromagnetic incremental sheet or tube forming. Both of the experimental and simulation results demonstrate that this new technology is feasible to produce large part. 相似文献
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B. H. Zhang Z. M. Zhang North China Institute of Technology Taiyuan China Mancuscript received July 《金属学报(英文版)》2000,13(2):446-450
1.~onItisessentialformakingtechnologyandoptimizingthedieconstructiontostudytheflowprincipleOfmetal.ThemethodsthatstudytheflowprincipleofmetalincludePhysicalstimulationandnumericalstimulation.BetWeenbothtwokindsofmethods,physicalstimulationhasthedisadvantagesOflongPeriodictime,heaVyinvestment,andthetotaldeformationprocesscannotbeobserveddirectly.However,numericalstimulationcanforeseethestatusOfmetalbilletinthediecavitythroughcomputerstimulation,beforethedieismade.Anditcanalterprocessschemean… 相似文献
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采用有限元法设计电磁成形的非均匀线圈(英文) 总被引:2,自引:0,他引:2
M.AHMED S.K.PANTHI N.RAMAKRISHNAN A.K.JHA A.H.YEGNESWARAN R.DASGUPTA S.AHMED 《中国有色金属学会会刊》2011,(3):618-625
电磁成形是一种使用脉冲电磁力快速成形的工艺。线圈是电磁成形系统中的一个重要组成部分,需要根据实际应用情况来设计。均匀螺旋线圈通常用在金属板材零件成形中。然而,对于这类非均匀线圈,工件中心部位的电磁力弱,从而导致变形不充分并且还有其它问题出现,如滞留气泡。因此,提出一个设计非均匀线圈的概念,以便电磁力的分布更均匀。采用有限元法对提出的非均匀线圈与传统的均匀螺旋线圈就电磁力的分布、磁场和电流密度进行比较。结果表明,非均匀线圈的电磁力分布更均匀。还计算了线圈的感应强度并进行了比较。 相似文献