Manufacturing mold and method of high-strength high-toughness fine-grain light alloy tubing

Abstract

The invention discloses a manufacturing mold and method of high-strength high-toughness fine-grain light alloy tubing. The manufacturing mold comprises an extrusion container, an extrusion cushion and a forming mandrel. The extrusion container is provided with a feeding section and a discharging section. The extrusion cushion is arranged in the feeding section. A separation section and a welding chamber are arranged between the feeding section and the discharging section. Multiple blank channels are arranged on the separation section. The forming mandrel and the extrusion cylinder are coaxial, and the forming mandrel extends out from the discharging section. The manufacturing method comprises the following steps that firstly, light alloy cylindrical blanks are heated to a temperature being a recrystallization temperature or above; secondly, the heated blanks are placed in the extrusion container; thirdly, an extruding machine is switched on, and the blanks are extruded through the extruding machine; and fourthly, under extrusion of the extruding machine, the tubing is obtained finally. The light alloy material adopted by the manufacturing mold and the method is of a quite fine crystal structure and high in yield stress, and therefore the plasticity, the low-temperature super-plasticity and the high strain rate super-plasticity of the tubing can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of pipe forming, in particular to a high-strength toughness fine-grained light alloy pipe preparation mold and a preparation method thereof. Background technique [0002] In industrial production, during the production and processing of light alloy pipes, the 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 light alloy pipes is concerned, especially thin-walled and high-precision light alloy pipes, at present, pre-prepared hollow blanks are generally used, the inner diameter of which corresponds to the inner diameter of the pipe; then the pipe is produced on a press with low and medium power At that time, the hollow blank is mainly obtained by mechanical processing (drilling and boring), and the hollow ...

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Problems solved by technology

[0004] However, in the traditional extrusion production process, a banded structure and a strong basal texture along the extrusion direction of the pipe will be formed, which seriously reduces the mechanical properties of the light alloy and causes anisotropy of the mechanical properties. These textures It is not conducive to the secondary processing of thin tubes (such as internal high pressure forming, corner bending, simmering, etc.); it is easy to cause defects such as shrinkage cavities and porosity in the light alloy casting structure, which makes the processing accuracy of tubes, especially thin tubes, worse

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