What are the differences between ring forgings and common large flanges
A forging is an object in which a metal is pressured to form a required shape or a suitable compression force through plastic deformation. This force is typically achieved through the use of a hammer or pressure. The forging process creates a refined grain structure and improves the physical properties of the metal. In the actual use of components, a correct design can make the particle flow in the direction of the main pressure.
For large flanges, the middle plate is first cut into suitable strips, and the length of the strips depends on the specifications of large flanges. Then roll it into a circle with a ring rolling machine, weld the joint firmly with welding rods, and carry out X-spectral inspection at the welding joint. Then use a press to flatten it, and then use a lathe to process waterlines, chamfers and other processes, and finally use an indexing plate to cooperate with a drilling machine to process bolt holes. When drilling bolt holes, it is not allowed to drill bolt holes in places with large flange welds.
There are three types of production processes for large flanges: forging, rolling and splicing. If the product size is too large, it can only be rolled and spliced.
The process characteristics of ring forgings are: its smelting and forging processes affect the microstructure and properties of forgings to a considerable extent. Experimental analysis was carried out on the low-magnification structural defects in the ring-shaped forgings produced by the vacuum induction and vacuum self-consumption remelting double-linked smelting process of GH4169 alloy rods. According to the energy spectrum analysis and comparison between the defect area and the normal area of the matrix, the main reason for the formation of low-magnification microstructure defects in ring forgings may be due to the segregation of Nb and Ti elements, the δ phase and the enrichment of MC, which belong to the defects brought about by smelting. Forging processing is not the leading inducement factor.
The advantages of forgings are stretchable length, shrinkable cross section; shrinkable length, stretchable cross section; changeable length, changeable cross section. The types of forgings are: free forging/hand forging, hot die forging/precision forging, upset forging, roll forging and die forging.
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