对于≥φ500mm的厚壁大圆环锻件,采用辊锻工艺生产,具有尺寸精确和生产效率高等优点。 在不具备辊锻的生产条件下,一般应用冲孔、马架扩孔。若在心棒上套入适当的垫环后再扩孔(或将心棒与垫环设计加工为整体),从而增加 For ≥ 500mm thick large ring forgings, the use of roll forging production, with the advantages of precision and production efficiency. In the absence of roll forging production conditions, the general application of punching, rack reaming. If the mandrel after nesting into the appropriate ring after re-expansion (or the mandrel and the ring design as a whole), thereby increasing