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Magnesium alloy sheet different temperature drawing mold

A technology of differential temperature deep drawing and magnesium alloy, which is applied in forming tools, manufacturing tools, metal processing equipment, etc., and can solve problems such as difficult stamping and poor plasticity at room temperature

Inactive Publication Date: 2015-04-08
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

The quality of stamping parts mainly depends on stamping forming technology, molds, equipment and other stamping forming technologies. However, due to its close-packed hexagonal crystal structure, magnesium alloy has poor plasticity at room temperature and is difficult to stamping and forming. At present, research results on magnesium alloy thin plate stamping forming technology are great. Some are limited to laboratory research applications, and have not yet entered the level of industrial scale production, especially in the automotive industry and aerospace industry where the stamping parts are used in large quantities and the material deformation is complicated during stamping. Only a small number of stamping parts of individual enterprises use magnesium. alloy

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] Magnesium has a close-packed hexagonal crystal structure, and there are five slip systems including basal plane slip, prismatic plane slip, and cone twinning. At room temperature, only the base plane slips, so the cold formability is poor. When the temperature rises, the number of slip coefficients involved in deformation increases, and recovery and recrystallization can also eliminate part of the work hardening generated during plastic deformation, increasing its plasticity. Most wrought magnesium alloys are suitable for stamping at 200°C to 400°C. In terms of cost performance, AZ31B magnesium alloy sheet is suitable for the production of stamping parts, and it has good plasticity when the temperature reaches a certain range. Stress-strain curves of AZ31B thin plate at different temperatures studied from E.Doege, Zhang Xianhong, Gao ...

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Abstract

The invention discloses a magnesium alloy sheet different temperature drawing mold. The mold is of inverted type, i.e. a drawing terrace mold (12) and a blank holder (1) are installed at a lower mold of the mold; a concave mold (32) is installed at the upper mold of the mold; a resistance annular heating coil and a temperature measuring element thermal coupler are embedded in the concave mold (32) and the blank holder (1); the upper mold and the lower mold are guided by a ball guide pillar (11) and a guide sleeve (17); and a drawing piece is pushed out from the concave mold (32) by a spring and a hitting plate (18) in the upper mold. A mode of different temperature drawing mold structure is adopted, i.e. a contact part of the blank holder and the concave mold with a blank deformation area is heated, and the cylindrical walls of the concave mold and the terrace mold are cooled, so that the plate blank is provided with a rational temperature difference during the drawing process. The mode of different temperature drawing mold structure is adopted and the surface roughness value of the working surface of the drawing terrace mold is larger than the surface roughness value of the working surface of the blank holder, so that the limiting drawing ratio of AZ31B is improved greatly.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy processing, in particular to a magnesium alloy thin plate differential temperature drawing die. Background technique [0002] With the development of automotive, aviation, aerospace, and electronic industrial products in the direction of lightweight and special performance requirements, magnesium alloy stamping products, as a non-ferrous metal material structure with light weight, high strength and rigidity, good electromagnetic shielding and damping It has broad prospects for application in these industries. However, magnesium alloys are difficult to be stamped and deformed at room temperature, and there are few related research results. It is of great significance to study the stamping forming technology of magnesium alloy sheet to improve the application range of magnesium alloy. Based on light weight, high strength, excellent special performance and advantages in mineral resources, m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D37/10B21D37/16B21D22/20
Inventor 喻祖建李建辉
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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