Multi station cold heading process of A286 superalloy twelve point flange bolt

A286 superalloy 12 point flange bolt is usually formed by hot upsetting, but its production process is cumbersome, processing efficiency is low and manufacturing cost is high. In this paper, according to the structural characteristics of an aerospace A286 superalloy twelve corner flange bolt, a multi station cold heading process is proposed. The real stress-strain curve of A286 superalloy is obtained by room temperature compression experiment and imported into the numerical simulation software DEFORM-3D. The multi station cold upsetting process of A286 superalloy twelve corner flange bolt is numerically simulated. The load time curve, equal effect force field distribution, equal effect variable field distribution and damage value distribution of each station are comprehensively analyzed, and the forming process parameters are determined. Finally, according to the numerical simulation results and the forming process, the corresponding die structure is designed, and the process test is carried out on the multi station cold heading machine. The test results show that the cold upsetting forming of A286 superalloy twelve corner flange bolt can be realized within the allowable stress range of the die by reasonably designing the number of cold upsetting processes. The A286 superalloy twelve corner flange bolt forgings obtained from the process test are fully filled and in good agreement with the simulation results. It has certain guiding significance for the multi station cold heading of this kind of parts and other similar parts.