A molding die and molding method for an ultrafine-grained hollow magnesium alloy profile

Abstract

The invention discloses a forming mold and method for an ultra-fine grain hollow magnesium alloy profile. The forming mold comprises a base, a concave die outer sleeve, a concave die inner sleeve, an extruding needle, an extruding shaft and an extruding pad, wherein the concave die inner sleeve is provided with a forming concave die. The forming method the following steps: (1) fixedly connecting the extruding pin and the extruding shaft with an inner sliding block and an outer sliding block of a double-acting extruding machine; (2) heating an ultra-fine grain hollow cylinder blank above a re-crystallization temperature; (3) putting the heated blank into a feeding section of the forming concave die; (4) starting the double-acting extruding machine to position the extruding needle, and pushing the extruding shaft and the extruding pad through the outer sliding block to extrude the blank; and (5) finally forming a tubular product by virtue of the extrusion of the outer sliding block of the extruding machine. According to the forming mold and method, the continuous plasticity of the magnesium alloy tubular product in the machining process can be effectively improved, the mechanical property can be enhanced, and the large-batch production machining can be realized.

Description

technical field [0001] The invention relates to the technical field of pipe forming, in particular to a forming die and a forming method of an ultrafine-grained hollow magnesium alloy profile. Background technique [0002] In industrial production, during the production and processing of pipes, pipes are mainly extruded through forming dies; the traditional light alloy plastic deformation process includes multiple stages such as ingot preparation, ingot treatment, billet heating, and thermoplastic deformation. [0003] As far as the manufacture of ultra-fine-grained alloy (light alloy) pipes is concerned, especially thin-walled and high-precision light alloy pipes, at present, extrusion is mainly used for forming, but in the traditional extrusion production process, generally forward extrusion , forward extrusion will form a banded structure along the extrusion direction of the tube and a strong basal texture, which seriously reduces the mechanical properties of the magnesiu...

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Problems solved by technology

[0003] As far as the manufacture of ultra-fine-grained alloy (light alloy) pipes is concerned, especially thin-walled and high-precision light alloy pipes, at present, extrusion is mainly used for forming, but in the traditional extrusion production process, generally forward extrusion , forward extrusion will form a banded structure along the extrusion direction of the tube and a strong basal texture, which seriously reduces the mechanical properties of the magnesium alloy and causes anisotropy of the mechanical properties. These textures are not conducive to the secondary properties of the thin tube. Secondary processing (such as internal high pressure forming, corner bending, simmering, etc.); it is easy to cause defects such as shrinkage cavity and porosity in the light alloy casting structure, which makes the processing accuracy of pipes, especially thin pipes, worse

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