Development and Research of the Billet Forging Technology in the Newly Designed Step-Wedge Dies

Abstract

One of the main ways to improve product quality, obtained by forging, is implementing shear and alternating deformation (severe plastic deformation) during deformation process, which allows manufacturing products with required mechanical properties and less forging reduction. In practice, it is possible to implement shear and alternating deformation by improving the design of the ingots or the billets, forging tools, heating modes and forging method. In this paper newly designed forging die, which allows implementation of shear and alternating deformation without sufficient changes of the billet sizes, is proposed. By the research results of the new forging technology influence in the proposed tools on the microstructure evolution, it was found, that the use of the newly designed step-wedge dies has more potential for manufacturing high-quality forgings with required level of mechanical properties.

Obtaining an Equiaxed Ultrafine-Grained State of the Longlength Bulk Zirconium Alloy Bars by Extralarge Shear Deformations with a Vortex Metal Flow

“…The metal flow nonmonotonicity will also play a significant role here. The UFG forming conditions implementation is easy for the discrete processes such as pressing (equal channel angular pressing—ECAP) [ 7 , 8 , 9 ], forging [ 10 ], and high-pressure torsion (HPT) [ 6 , 11 ], but production complications solving is relevant for the long-length products with inevitable tensile stresses, such as rolling [ 12 ] or drawing [ 13 ]. The best improvement effect can be given by the vortex metal flow implementation under the all-round hydrostatic compression conditions [ 14 ].…”

Study of the influence of large shear strains and vortex flow of metal on the formation of an equiaxed ultrafine-grained structure of the E110 zirconium alloy by X-ray diffraction analysis

“…Существенную роль здесь также будет играть немонотонность течения металла. Реализация этих условий легка в дискретных процессах интенсивной пластической деформации вроде прессования [7][8][9], ковки [10], кручения под высоким давлением [6,11], но сложна для производства длинномерных изделий с неизбежными растягивающими напряжениями, где применяется прокатка [12] или волочение [13]. Наилучший эффект улучшения может дать реализация вихревого течения металла в условиях всестороннего гидростатического сжатия [14].…”

Volumetric and Graphical Presentation of Stress-Strain State of the Aluminium Billet at Realization of the Forging Process.

“…The forging process in the die is similar to the casting process. Metal in solid state is deformed and begins to flow, filling the die cavities [1][2][3][4][5][6][7][8][9][10]. In this case, strain velocity will vary over the entire time range of the forging process in the entire volume of metal.…”