Eccentricity-resistant process design and finite element analysis of deep hole cylindrical parts

In this paper, finite element analysis software was used to simulate and compare the deep-hole cylindrical parts formed by single process hot extrusion and double-process hot extrusion under the condition of uneven initial circumferential temperature of billet. The results show that the deformation resistance of the material is affected by the uneven temperature, and the strength of the single process hot extrusion parts is weakened because of the long punch length, which is easy to cause the eccentricity problem of the deep-hole cylindrical parts, and the wall thickness difference of the deep-hole cylindrical parts reaches 1.23 mm. The double-process hot extrusion can greatly reduce the influence of eccentricity on the deep hole cylindrical parts, make the wall thickness distribution more uniform, and the wall thickness difference is 0.38 mm. At the same time, the double-process hot extrusion reduces the forming force by 900 T and improves the feasibility of the process.