Development of a Method of Forging Long-Length Blanks with Intensification of Shear Deformation

Abstract

Modern press forging manufacture of large steel forgings is moving along the way of increasing service properties and reducing energy-power parameters. This is evidenced by a significant number of works devoted to the study of forging technology with the use of special tools allowing to implement severe plastic deformation. As a result, it is possible to improve significantly the metal structure at the same values of the forge reduction. The paper presents the results of the development and investigation of a new method of forging large steel billets with the intensification of shear deformation and with the use of standard anvils. The analysis of the stress-strain state in comparison with traditional forging scheme on an example of forging billets made of high speed steel R6М5 (State Standard GOST 19265-73) is presented. It is shown that the accumulated degree of shear deformation, as well as the uniformity of its distribution, is higher for the new method with the same reduction values. Approbation of the new method of forging on a hydraulic press was carried out for the blanks made of aluminium alloy D16 (State Standard GOST 21488-97).

Computer modeling and investigation of the deformation process in convex-concave and trapezoidal strikers

“…It is possible to achieve the implementation of additional alternating or shear strains in the entire volume of the deformed metal in the forging process in several ways, which include: torsion precipitation [3], deformation with an asymmetric load application [4], broaching of the workpiece in tools with complex movement of strikers [5 -8] and many others [9 -14]. Many of these methods, although they allow the development of additional alternating or shear strains in the deformation process, which make it possible to obtain forgings with a finegrained structure, but many of them have a number of disadvantages.…”