ABSTRACT

The generation and optimization of attractive force between the coil and the workpiece is of significance for expanding the application of electromagnetic forming. In this work, a method using a low-frequency half-wave current is proposed to improve the attractive force, and to achieve a high-performance attractive forming. To verify the effectiveness of this method, an RLC circuit with a thyristor switch is introduced to generate the half-wave current, and the deformation behavior of an AA1060-H24 sheet is analyzed. According to both numerical and experimental investigations, it is demonstrated that the aluminum alloy sheet can be efficiently attracted toward the coil surface with a maximum deformation of more than 6 mm after a single discharge. On this basis, a series of simulations and experiments are carried out to clarify the effects of the discharge energy and current frequency on the attractive forming process. It is found that under the same forming depth, the required discharge energy and coil temperature rise for a smaller capacitance (1280 μF) can be decreased by almost 35% and 50%, respectively, compared to that for a larger capacitance (2880 μF). The obtained results are of certain value to promote the development of electromagnetic attractive forming.

摘要

线圈与工件之间吸引力的产生和优化对于扩大电磁成形的应用具有重要意义。在这项工作中，提出了一种使用低频半波电流的方法来提高吸引力，并实现高性能的吸引力成形。为了验证该方法的有效性，引入了带有晶闸管开关的RLC电路产生半波电流，并分析了AA1060-H24片材的变形行为。根据数值和实验研究，表明铝合金板可以有效地被吸引到线圈表面，单次放电后最大变形超过 6 mm。以这个为基础，进行了一系列模拟和实验，以阐明放电能量和电流频率对吸引成形过程的影响。发现在相同的成型深度下，较小电容（1280 μF）所需的放电能量和线圈温升与较大电容（2880 μF）相比可分别降低近35%和50%。 . 所得结果对促进电磁吸引力形成的发展具有一定的价值。