Analysis of deep drawing with electro-permanent magnet based on coupling of multi-physics

Abstract

The electro-permanent magnet (EPM) blank holder (EPMBH) technology has been combined with forming technology. The method commonly used in previous related studies was to simulate and analyze the magnetic field of the EPMBH device and obtain the magnetic attraction under corresponding conditions. During the forming process, a blank holder force with the same magnitude as the magnetic attraction was loaded, and then the temperature field of the EPMBH device was analyzed separately. Due to the lack of consideration of the interaction between various physical fields, there is a significant deviation between the simulation and experiment with this method. To improve the accuracy of analysis results, this article introduces an analysis method that considers the mutual influence of various factors and simulates the coupling of magnetic field, structural field, and temperature field in deep drawing, which is compared with the deep drawing experiment with EPMBH. There is no obvious temperature rise issue during the experiment, and constant blank holder force loading can be achieved with EPMBH. The results show that for 08-Al thin plate with an initial thickness of 0.8 mm and a diameter of 100 mm, the optimal magnetization current is 13 A and the drawn part can be obtained without wrinkling and fracture defects.