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. Rotary forging with double symmetry rolls (DSRs) is a newmetal plastic forming technology developed on the basis of conventionalrotary forging with a single roll, which uses a pair of symmetrical cone rollsto realize continuous local pressure plastic deformation of the workpiece.Large-diameter, thin discs are a key component in nuclear power, aerospace,deep-sea exploration, and other fields. At present, the forming process oflarge-diameter discs mainly includes welding and multiple local upsetting,but these processes exhibit many defects and can not meet the requirementsof industry. In this paper, a large diameter : thickness ratio disc isintegrally formed by rotary forging with DSRs. Using theoreticalcalculation and finite element simulation methods, the stable rollingconditions and calculation formulas of force and power parameters of rotaryforging with DSRs of a large diameter : thickness ratio disc are derived.Based on the reliable three-dimensional rigid-plastic finite element model,the plastic deformation characteristics of rotary forging with DSRs of discsare studied, the reliability of the stable rolling conditions and thecalculation formulas of force and power parameters are verified, and thedefects and causes of unstable rolling conditions are analysed. Anexperiment was carried out on a rotary forging press developed with doublesymmetry rolls, and the experimental results are in good agreement withsimulation results, which demonstrated that rotary forging with DSRs is areliable technology for forming large diameter : thickness ratio discs. Theresults of this research are helpful to promote the further development ofrotary forging with DSRs.

Research on forming technology of rotary forging with double symmetry rolls of large diameter : thickness ratio discs