During forging, the metal exerts pressure through plastic deformation to shape the required shape or properly compress the object. This force is usually achieved by using a hammer or pressure. The forging process has established a fine particle structure and improved the physical properties of the metal. In the actual use of parts, correct design can make particles flow to the direction of main pressure.
The technological characteristics of ring forgings are that their smelting and forging processes greatly affect the structure and properties of forgings. The ring forging produced by GH4169 alloy bar adopts the vacuum induction and vacuum consumable remelting duplex smelting process. By dissecting and observing the macrostructure defect and microstructure morphology at the defect location, the energy spectrum of the defect area and the normal area of the matrix is analyzed and compared. The main cause of macrostructure defect of ring forging may be the segregation of NB and Ti elements, the enrichment of ↑ phase and MC, which belongs to smelting defect.
For large flange, the medium plate shall be cut into suitable strips. The length of strips depends on the specification of large flange. Then use the coiling machine to roll into a circle, and use the welding rod to weld the interface firmly. The welded joint shall be subject to X-ray spectrum inspection. Then use a press to flatten, and then use a lathe to process waterline, chamfer and other processes, and then use a indexing plate to cooperate with a drilling machine to process bolt holes. Bolt holes shall not be drilled with large flange welding interface.
The production process of large flange includes forging, rolling and splicing. Excessive product size can only be used for rolling and splicing. Forgings have the advantages of elongation, shrinkable cross section, shrinkable length, retractable cross section, variable length, variable cross section, etc.