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Magnesium alloy extrusion combined die and casting-extrusion-shearing method thereof

A technology of extrusion die and magnesium alloy, which is applied in the field of magnesium alloy casting, can solve the problems of less slippage, limit the application of magnesium alloy, and not easy to press processing, etc., to reduce the contact area, save experimental expenses, and reduce frictional resistance Effect

Inactive Publication Date: 2017-12-15
CHONGQING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since magnesium has a close-packed hexagonal crystal structure, the slip system is relatively small, and it is not easy to press process it, which greatly limits the application of magnesium alloys.

Method used

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  • Magnesium alloy extrusion combined die and casting-extrusion-shearing method thereof
  • Magnesium alloy extrusion combined die and casting-extrusion-shearing method thereof
  • Magnesium alloy extrusion combined die and casting-extrusion-shearing method thereof

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Embodiment 1

[0061] Embodiment 1 mold design and manufacture

[0062] 1. Selection of mold materials

[0063] In order to achieve the purpose of controlling the formation and development of the material microstructure, refining the sample grains and improving the performance of the material through the comprehensive process of rapid solidification, work hardening, dynamic recovery and dynamic recrystallization, a set of assembleable type mold. Combined with factors such as the temperature range and strong friction during the extrusion process, H13 hot work die steel was finally selected (the chemical composition is shown in Table 1, it is a steel grade formed by adding alloy elements on the basis of carbon steel, and the unified number code is T20502 ; Grade 4Cr5MoSiV1) as the material of the mold.

[0064] Table 1 Chemical composition of H13 steel

[0065]

[0066] 2. Mold structure design

[0067] The three components of the combined die are divided into variable extrusion ratio c...

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Abstract

The invention relates to a magnesium alloy extrusion combined die. The magnesium alloy extrusion combined die is formed in a way that a variable-extrusion ratio casting extrusion die, an equal-channel corner die and an extrusion punch are combined, wherein the variable-extrusion ratio casting extrusion die, the equal-channel corner die and the extrusion punch are detachable; the extrusion punch is installed at a feed opening of the variable-extrusion ratio casting extrusion die, and the equal-channel corner die is installed at a discharge opening of the variable-extrusion ratio casting extrusion die; and the extrusion punch is in a shape of sand glass, a funnel-shaped vertical channel is formed in a die cavity in the variable-extrusion ratio casting extrusion die, a channel of a die cavity in the equal-channel corner die forms corners from 0 to 90 degrees together with the upper and lower planes of the die, and the fillet radius of each corner is 3 mm. Magnesium alloy after chilling casting is assembled with the die and is heated and then is put on a forging press for forward extrusion, so that the grain refinement of the magnesium alloy can be realized, and the cross section of an obtained magnesium alloy bar has the advantages of small grains, uniform tissues and excellent mechanical properties.

Description

technical field [0001] The invention belongs to the field of magnesium alloy casting, and relates to a magnesium alloy extrusion combined mold and a casting-extrusion-shearing process method thereof. Background technique [0002] As people's understanding of magnesium alloys is getting deeper and deeper, the application research of magnesium alloys has also been highly valued. Many countries have included the application research of magnesium alloys as a key research project. Magnesium alloys are known as the 21st century. Metal. Magnesium alloys have been widely used in many fields, such as aviation, aerospace, automobiles, computers, communications, home appliances and defense industries. [0003] At present, a large number of magnesium alloy products are mainly obtained through casting, semi-solid forming and other production methods. Magnesium alloy products through plastic deformation have higher strength, better ductility, and more diverse mechanical properties than c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06B22D18/02
CPCC22F1/06B22D18/02
Inventor 张丁非冯靖凯潘复生陈蓉赵阳陈志远伍华怡于媛媛
Owner CHONGQING UNIV
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