Feasibility of using Continuously Cast Round Bloom as a Substitute to Cast Ingot in the Manufacture of Heavy Forgings

Abstract

The shop floor manufacturing of a main shaft has been performed to confirm the feasibility of using continuously cast round bloom in the manufacture of heavy forgings. Using a round bloom instead of an ingot shows good product qualities and increases the raw material recovery ratio. Further details can be found in the article, number http://doi.wiley.com/10.1002/srin.202000079, by Young Hoon Moon and co‐workers.

Hydraulic Press Open Die Forging of 21CrMoV5-7 Steel CCM Roller with Flat Upper and Concave Semi-round Lower Cogging Dies

“…It is convincingly indicated by the results of both modeling [14,15,17] and experiments [16,18]. The macroshift deformations effect is achieved by radial reduction with complicated shape dies [17], the use of a special cast [18], or preformed [19] workpiece. The special fourdie devices are applied for these purposes also [20].…”

“…Realization of macro-shifts in material bulk allows refining of ingot cast structure without sufficient alternations in the area of its cross-section. It promotes to close of inner defects [12][13][14][15][16][17][18] (like cracks [12], inner voids [13][14][15], or cast axial non-density [16][17][18]), even for forging of big ingots with minimal forging ratio. It is convincingly indicated by the results of both modeling [14,15,17] and experiments [16,18].…”

“…It promotes to close of inner defects [12][13][14][15][16][17][18] (like cracks [12], inner voids [13][14][15], or cast axial non-density [16][17][18]), even for forging of big ingots with minimal forging ratio. It is convincingly indicated by the results of both modeling [14,15,17] and experiments [16,18]. The macroshift deformations effect is achieved by radial reduction with complicated shape dies [17], the use of a special cast [18], or preformed [19] workpiece.…”

“…Besides, different assemblies of tools for open die forging are used for obtaining three-and four-beam workpieces. Investigations of forging workpieces with specially shaped dies are described early in [17][18][19]. As well as the use of dies with a complex curved parting line [23], radial [24], spherical [25] dies, and four-beam workpiece [26] indicates the dimensions controlling possibility and macroshift metal flow initiating.…”