共查询到17条相似文献,搜索用时 203 毫秒
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对塑料瓶的电磁成形封接工艺进行研究,通过对放电电压、电容、线圈位置等参数进行调节,得出了优化的封口工艺。试验结果表明:线圈位置,电压对封口效果影响较大。 相似文献
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对压力容器爆破片的电磁成形工艺进行了实验研究,讨论了充电电容、充电电压,坯料厚度和线圈与工件的距离对成形的影响,比较了应变分布规律,提出了用该形状零件作为薄板件电磁成形的标准工艺参数研究实验,可以用于研究薄板件电磁成形的各种电参数,材料参数,线圈参数和位置参数的变化规律。 相似文献
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《塑性工程学报》2015,(6):71-77
针对大型铝合金曲面零件电磁渐进成形工艺中板料不均匀变形的问题,基于ANSYS多物理场模块建立电磁场-结构场耦合模型,对成形过程进行数值模拟分析,研究电磁成形线圈结构参数对板料变形行为的影响,包括:线圈层数、线圈匝间距、线圈层间距、导线截面积和导线截面形状。研究表明,线圈层数增加,板料变形均匀性降低,而板料的变形量增大,多层线圈有利于提高线圈的强度和使用寿命;线圈匝间距与导线的宽度越接近,板料均匀变形效果越好;矩形导线截面的线圈相对圆形导线截面的线圈使板料变形更加均匀;线圈层间距和导线截面积对板料均匀变形影响不大,但是合理的结构参数可以提高线圈强度。提出了一种非等间距线圈结构,非等间距线圈产生的电磁场和电磁力是不均匀的,在板料半径1/3处受到的成形驱动力较大,而这种不均匀的变形力,进一步改善了电磁成形中板料的变形不均匀性,电磁成形平板线圈能与变形后的板料较好的贴合,使大型铝合金曲面零件电磁渐进成形能通过多次放电连续均匀塑性变形。通过实验验证了线圈结构优化设计的可靠性,实验结果与模拟结果基本一致,误差在12%以内。 相似文献
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对玻璃瓶的电磁成形封接工艺进行了研究,翻边过程的数值模拟和实验研究表明封接效果对线圈的位置敏感,数值模拟还表明:材料的翻边高速成形类似波的传输过程。对缩管的放电电压、电容等参数进行调节,得出了优化的封接工艺。 相似文献
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与单线圈电磁翻边成形相比,双向加载式电磁翻边成形的电磁耦合更加复杂,导致系统的鲁棒性降低,易出现屈曲问题。为此,对屈曲现象形成的原因进行分析,发现轴向线圈在翻边区域产生的磁通的分布差异过大是形成屈曲的主要原因。采用优化轴向线圈结构参数的方法,建立仿真模型,设计探究方案,揭示轴向线圈结构参数对双向加载式电磁翻边成形的影响规律,而后根据仿真分析结果选择表现较佳的参数组合形成新方案。将原方案与新方案的双向加载式电磁翻边成形结果进行对比,结果表明:轴向线圈参数优化后的双向加载式电磁翻边方案在更宽的放电范围内保持成形效果良好,成形性能得到了改善,拥有更强的鲁棒性。 相似文献
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电磁铆接技术研究概况及发展趋势 总被引:3,自引:0,他引:3
对电磁铆接技术的研究现状作了概述.从原理出发,对国内外电磁铆接设备、工艺及绝热剪切变形机理的研究进行了分析比较,指出电磁铆接设备将走低电压发展的道路,数值模拟将在今后的研究中发挥越来越重要的作用,最后对该领域的发展趋势提出自己的观点. 相似文献
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飞机的结构件在铆接时存在铆接误差与应力集中,且在疲劳载荷的作用下容易产生疲劳裂纹,影响飞机的飞行安全性。针对铆接结构的隐藏缺陷,现有技术难以检测,而远场涡流检测技术不受集肤效应的限制,对铆接结构缺陷的检测具有潜在优势。本研究对铆接结构的隐藏缺陷开展远场涡流检测试验研究,从远场涡流检测理论出发,研究激励/检测线圈距离、匝数与检测频率、灵敏度的关系,在此基础上优化远场涡流传感器的激励参数。结果表明:当激励线圈的匝数为1 000,可感生出较强的涡流场;由于检测线圈采用的是差分形式,当检测线圈距离为7 mm时,检测信号幅值最大,且根据幅值特性或相位特性任一个信号,可准确对缺陷进行定位。 相似文献
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Yuri V. Batygin Sergey F. Golovashchenko Andrey V. Gnatov 《Journal of Materials Processing Technology》2013,213(3):444-452
The paper is dedicated to the study of pulsed electromagnetic attraction processes which can deform ferromagnetic sheet metal materials such as low carbon steels using low frequency discharges. The analytical model based upon the solution of Maxwell equations explains that magnetic forces are prevailing over the Lorentz forces for low frequency discharges. For electromagnetic forming (EMF) processes employing ferromagnetic sheet metal blanks of low electrical conductivity with relatively slow electric discharges, the magnetic forces should be taken into account in order to achieve a correct representation of electromagnetic forces applied to the blank. An engineering estimate on the size of magneto-static forces and Lorentz-forces is the outcome of the analytical work. In addition to analytical work and validation of the proposed engineering estimate of attracting forces, a single turn coil is introduced which is more robust than previous designs with multiple frequencies and interrupted discharges. The simplified setup only requires a rather slow single frequency low voltage electric discharge which allows for using cheaper and longer life capacitors, substantially reduces the safety implications and also extends the life of the coil insulation. 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