Uniform pressure actuators (UPAs) have unique advantages for electromagnetic forming, and they have excellent prospects in specific applications. The typical structure of conventional UPAs consists of an internal coil and an external conductive channel; this leads to certain limitations such as poor electrical contact and low coil strength. In the present study, in order to resolve these shortcomings, a new type of UPA is proposed, in which the induced circuit consists of a conductive channel and a workpiece that is placed inside a spiral coil. Benefitting from the innovation of the special structure, the proposed UPA can improve the electrical contact by producing a squeezing force between the conductive channel and workpiece during the forming process. Moreover, it provides an open reinforced environment for increasing the coil strength without affecting the forming efficiency. Numerical and experimental studies demonstrate that forming efficiency of the proposed UPA is higher than that of the conventional UPA. Based on these advantages and the new proposed uniform-velocity method, the proposed UPA is applied to fabricate a fuel cell titanium bipolar plate in a single discharge process.

均匀压力执行器（UPA）在电磁成型方面具有独特的优势，在特定应用中具有极好的前景。常规UPA的典型结构包括一个内部线圈和一个外部导电通道。这会导致某些局限性，例如不良的电接触和较低的线圈强度。在本研究中，为了解决这些缺点，提出了一种新型的UPA，其中感应电路由导电通道和放置在螺旋线圈内部的工件组成。得益于特殊结构的创新，所提出的UPA可以通过在成型过程中在导电通道和工件之间产生挤压力来改善电接触。此外，它提供了开放的增强环境，以提高线圈强度而不影响成型效率。数值和实验研究表明，所提出的UPA的成形效率要高于传统UPA。基于这些优点和新提出的均匀速度方法，提出的UPA可在一次放电过程中用于制造燃料电池钛双极板。