Fuel cell metal polar plate lubricating and stamping method and polar plate workpiece

Abstract

The invention provides a fuel cell metal polar plate lubricating and stamping method and a polar plate workpiece, and relates to the field of stamping methods.The surface of a plate is coated with a lubricant, and the coating position is covered with a film; the thin film and the plate are fixed along the edge, and the thin film and the plate are punched together; the film is attached to the plate and deforms together with the plate under the action of the mold, so that the plate forms a characteristic structure; in order to solve the problem of insufficient forming precision caused by poor lubricating effect during plate stamping forming at present, the plate surface is coated with a lubricant and then covered with a deformable thin film, the thin film is attached to the plate through the lubricant, distribution of the lubricant can be kept in the extrusion process, meanwhile, the thin film can also achieve a solid lubricating effect, and the forming precision is improved. Therefore, the lubricating effect of the die on all positions during plate stamping is guaranteed, stress concentration is reduced, and the forming precision is improved.

Description

technical field [0001] The invention relates to the field of stamping methods, in particular to a stamping method for lubricating a metal pole plate of a fuel cell and a pole plate workpiece. Background technique [0002] In the fuel cell, the bipolar plate is used as the framework to support the entire stack, accounting for 60-80% of the total mass of the stack, accounting for more than 60% of the total volume, and is responsible for the distribution of water and gas, and the collection of current. The flow field structure of the fuel cell plate is relatively complex, and the size of the flow channel is mostly at the millimeter level, which is a typical mesoscopic scale, and requires high precision, so the processing process is relatively cumbersome. [0003] The thickness of the plates used to produce metal plates is mostly a few tenths of a millimeter. At present, most metal plates are produced by stamping. The molds and supporting equipment are simple and can ensure prod...

AI Technical Summary

Problems solved by technology

Although the stamping and forming fuel cell metal pole plate has the above advantages, but also due to the stress concentration in the forming process, the deformation of the plate is not in place during the stamping forming process, and the fit between the mold and the plate is poor, resulting in the thickness distribution of the plate in stamping forming. Problems such as unevenness and poor forming quality

The traditional way is to lubricate by adding lubricant between the mold and the plate to promote the relative sliding between the plate and the mold, thereby reducing stress concentration. However, due to the fluidity of the lubricant, it is difficult to ensure uniform distribution of the lubricant during the stamping process. The lubricant in the forming structure of the mold is easy to be squeezed out, so a good lubrication effect cannot be achieved, and stress concentration still exists in some areas; and for the forming process of the metal plate of the fuel cell, there are a large number of densely distributed grooves on the metal plate In the process of stamping and forming, under the dense characteristic structure, the traditional way of coating lubricant will produce more positions where the lubricant is unevenly distributed, affecting the lubrication effect and resulting in poor forming effect of the metal plate Good, uneven thickness distribution

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