Rotary forging with multi-cone rolls

Abstract

As equipment safety levels increase, the application of large-diameter discs in nuclear reaction vessels and other high-pressure vessels becomes increasingly important. At present, it is very difficult to form a large-diameter disc using the existing process. Therefore, a new metal plastic forming technology, which is named rotary forging with multi-cone rolls (MCRs), is presented for the integral forming of large-diameter and ultra-thin disc parts for the first time in this paper. Based on the reliable three-dimensional rigid-plastic FE model, the basic deformation characteristics of MCRs forming of disc parts are explored. The result shows that rotary forging with MCRs is also a process of gradual plastic deformation zone permeation, its axial plastic equivalent plastic strain is similar to that of conventional cold rotary forging. The effects of various parameters on rotary forging with MCRs, the main defects in the deformation process and the preventive measures were studied. The research results will help to better understand the metal plastic forming technology of rotary forging with MCRs and promote further development of rotary forging with MCRs.