The temperature rise of the working coil due to Joule heating is a very important issue in electromagnetic forming processes. A technically simple and cost-effective method was proposed to address this problem, which only needs to introduce an additional resistor in the discharge circuit. The core of this method is to alter the current waveform during the forming process by adjusting the damping coefficient of the discharge circuit. The effectiveness of the method was numerically analyzed in detail and verified by the experimental investigations. It has been demonstrated that the Joule heating in the coil can be significantly reduced when a resistor was applied, while ensuring the forming depth of workpiece unchanged. As an example, more than 50 % of the Joule heating in a bobbin coil can be decreased when a resistor of 400 mΩ is applied. Meanwhile, the versatility of the developed method was further verified through the analysis of an electromagnetic forming system with a spiral coil and a high-frequency discharge. Furthermore, this work found that the line resistance of discharge circuit should not be as small as possible. It has been proved that when the line resistance is already small, further reducing it has little effect on the improvement of forming efficiency, but it will greatly increase the Joule heating in the coil. The developed method of achieving adjustable current waveform and its application in reducing the Joule heating of coil could be of great significance to the development of electromagnetic forming.

焦耳加热引起的工作线圈的温度升高是电磁成型过程中非常重要的问题。提出了一种技术上简单且具有成本效益的方法来解决该问题，该方法仅需要在放电电路中引入一个额外的电阻器即可。该方法的核心是在成形过程中通过调节放电电路的阻尼系数来改变电流波形。对该方法的有效性进行了详细的数值分析，并通过实验研究进行了验证。已经证明，当施加电阻器时，在确保工件的形成深度不变的情况下，可以显着减少线圈中的焦耳热。例如，当应用400mΩ的电阻器时，可减少线轴线圈中超过50％的焦耳热。同时，通过对带有螺旋线圈和高频放电的电磁成型系统的分析，进一步验证了所开发方法的多功能性。此外，该工作发现放电电路的线电阻不应尽可能小。已经证明，当线电阻已经很小时，进一步减小它对提高成形效率几乎没有影响，但是它将大大增加线圈中的焦耳热。所开发的实现电流波形可调的方法及其在减少线圈的焦耳热中的应用对电磁成形的发展具有重要意义。通过分析带有螺旋线圈和高频放电的电磁成型系统，进一步验证了所开发方法的多功能性。此外，该工作发现放电电路的线电阻不应尽可能小。已经证明，当线电阻已经很小时，进一步减小它对提高成形效率几乎没有影响，但是它将大大增加线圈中的焦耳热。所开发的实现电流波形可调的方法及其在减少线圈的焦耳热中的应用对电磁成形的发展具有重要意义。通过分析带有螺旋线圈和高频放电的电磁成型系统，进一步验证了所开发方法的多功能性。此外，该工作发现放电电路的线电阻不应尽可能小。已经证明，当线电阻已经很小时，进一步减小它对提高成形效率几乎没有影响，但是它将大大增加线圈中的焦耳热。所开发的实现电流波形可调的方法及其在减少线圈的焦耳热中的应用对电磁成形的发展具有重要意义。已经证明，当线电阻已经很小时，进一步减小它对提高成形效率几乎没有影响，但是它将大大增加线圈中的焦耳热。所开发的实现电流波形可调的方法及其在减少线圈的焦耳热中的应用对电磁成形的发展具有重要意义。已经证明，当线电阻已经很小时，进一步减小它对提高成形效率几乎没有影响，但是它将大大增加线圈中的焦耳热。所开发的实现电流波形可调的方法及其在减少线圈的焦耳热中的应用对电磁成形的发展具有重要意义。