Extrusion forming method for no-anisotropy magnesium alloy rods

Abstract

The invention discloses an extrusion forming method for no-anisotropy magnesium alloy rods. The method relates to an extrusion forming mold for the no-anisotropy magnesium alloy rods; the mold comprises an insert, a convex mold connected with a press, a concave mold connected with a rotating mechanism, and an ejecting mechanism; a molding cavity is formed in the concave mold, and is provided witha feed port; an extrusion working belt is arranged in the molding cavity; and the insert is mounted on the extrusion working belt. The torque is applied based on traditional extrusion; the rotating lap number can be increased through change of the rotating speed, so that the gradient structure is improved under rotating formation, and the uniform deformation of the structure is realized; the higher shearing strain is generated through change of internal stress and strain states of a deformation body to form a fine crystal structure with large-angle grain boundary, so that the anisotropy of components is reduced; and insert can be timely replaced after wear to prevent the cost increment of the scrapped concave mold, so that the mold life is prolonged, and the popularization and economical benefit in the forging industry is prominent.

Description

technical field [0001] The invention belongs to the technical field of metal plastic processing and forming, and in particular relates to an extrusion forming method of a non-anisotropic magnesium alloy rod. Background technique [0002] Extrusion is widely used in the field of plastic forming of metal materials due to its advantages of high efficiency, high quality and low consumption. The traditional extrusion processing method refers to applying external force to the metal bar placed in the mold cavity to force the metal to extrude from the die hole to obtain the required cross-sectional shape, size and certain mechanical properties. During forward extrusion deformation, the bar is roughly divided into: deformation zone, non-deformation zone and dead zone. In the deformation zone, the metal flow is uneven, the center layer flows fast, and the outer layer flows slowly; when entering the stable deformation stage, the degree of uneven deformation is the same. There will be...

AI Technical Summary

Problems solved by technology

The metal is in a state of three-dimensional compressive stress during extrusion. Although the plasticity of the metal will be improved, due to the existence of additional stress, cracks will often occur when extruding low-plastic materials, resulting in product scrapping and restricting the extrusion process. Wide range of applications

Images