Research on plastic deformation transfer and distribution of large-diameter thin-walled metal ring parts in double-roll pendulum hot rotary forging process

Abstract

Many key structural components in large equipment such as launch vehicles, nuclear submarines, and nuclear power equipment are composed of large thin-walled metal rings with high diameter-thickness. With the development of science and technology, the traditional manufacturing method of melon-shaped tailor welding has gradually been unable to meet the equipment requirements. Due to the advantages of a small required forming force, stable process and good forming quality, the double-roll pendulum hot rotary forging (DRPHRF) technology has great potential in the overall manufacture of large-diameter thin-walled metal ring parts. However, many issues in the DRPHRF process are still unclear, and its application has been severely hindered. Therefore, this paper firstly determines the selection range of key forming parameters for large-diameter thin-walled metal rings in the DRPHRF process. Then, a reliable 3D rigid-plastic thermo-mechanical coupled finite element model for DRPHRF machining of large-diameter thin-walled metal rings was established in the 3D dynamic finite element software 3D-DEFORM. The reliability of the model is verified by experiments. Based on a reliable finite element model, the plastic transfer and distribution in the DRPHRF process of large diameter thin-walled metal rings are studied. On this basis, by setting the process conditions and the characterization factor Q, the influence of key process factors on the plastic distribution of the ring is studied. The research results of this study provide an important basis for the selection of key parameters of the DRPHRF process and the improvement of the forming quality of the DRPHRF process.