Nonanisotropic magnesium alloy bar extrusion forming mold

Abstract

The invention discloses a nonanisotropic magnesium alloy bar extrusion forming mold. The nonanisotropic magnesium alloy bar extrusion forming mold comprises an insert, amale mold and a female mold. The male mold is connected with a press for axial movement, the female mold is connected with a rotating mechanism for circumferential rotating movement, a cavity is formed in the female mold, a feed port is formed in the cavity, an extrusion working tape is further arranged in the cavity, the insert, a bar and the male mold are arranged in the feed port, and the insert is mounted at the position ofthe extrusion working tape. Torque is applied on the basis of traditional extrusion, a gradient structure generated under rotating forming can be improved by changing the rotating speed and increasing the rotating circle number, uniform deformation of the structure is achieved, the large shearing strain capacity is generated by changing the stress-strain state in a deformation body, grains can berefined, a fine grain structure with a large angle grain boundary is formed, the anisotropy of the components is reduced, the insert can be replaced in time after being abraded due to the structuralmanner of the insert, the situation that the cost is increased as the female mold is scrapped is avoided, thus, the service life of the mold is prolonged, and economic benefits are remarkable when thenonanisotropic magnesium alloy bar extrusion forming mold is popularized to the forging and pressing industry.

Description

technical field [0001] The invention belongs to the technical field of metal plastic processing technology and forming, and in particular relates to an extrusion forming die 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...

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

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