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A kind of small-radius bending and curling method of magnesium alloy plate

A magnesium alloy, small-radius technology, applied in metal rolling, metal processing equipment, forming tools, etc., can solve problems such as strain distortion of finished products, cracking at curling places, cracks, etc.

Active Publication Date: 2020-07-07
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on the hemming process of magnesium alloy sheets, especially magnesium alloy sheets used in door and body panels. For magnesium alloys, the commonly used hemming processes are stamping hemming, table hemming and rolling. However, The finished products obtained by the above three hemming methods all have local strain distortion problems that lead to cracking at the hemming; if the processing technology of the magnesium alloy plate cover is not correct during the hemming and small-radius bending process, the outer shape and size of the plate after hemming will be caused. There are certain limitations and defects such as cracks on the surface are prone to occur, so that effective covering parts cannot be obtained, which restricts the development of magnesium alloy automobile covering parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for bending and curling a magnesium alloy plate with a small radius, comprising the following steps:

[0021] (1) After heating the AZ31B magnesium alloy slab to 425°C, it is hot-rough rolled to 6.2mm, and the reduction rate is 10% each time, and then hot-rolled to 3.0mm at 350°C, and the reduction rate is 5% each time. %, if the temperature drops below 340°C, it needs to be reheated, and then hot finish rolling is carried out at 200°C, with a reduction rate of 5% each time, and finally an AZ31B magnesium alloy sheet with a thickness of 1mm is obtained;

[0022] (2) Heat-treat the AZ31B magnesium alloy sheet obtained in step (1) at 240°C, keep it warm for 60 minutes, and then water-cool to room temperature;

[0023] (3) Heating the AZ31B magnesium alloy sheet after cooling in step (2) to 150°C at the bend where it needs to be crimped, and performing electromagnetic induction heating treatment;

[0024] (4) Move the AZ31B magnesium alloy thin plate heated in st...

Embodiment 2

[0026] A method for bending and curling a magnesium alloy plate with a small radius, comprising the following steps:

[0027] (1) After heating the AZ31B magnesium alloy slab to 440°C, it is hot-rough rolled to 6.4mm, each time the reduction rate is 10%, and then hot-rolled to 3.6mm at 400°C, each time the reduction rate is 8 %, if the temperature drops below 340°C, it needs to be reheated, and then hot finish rolling is carried out at 230°C, with a reduction rate of 5% each time, and finally an AZ31B magnesium alloy sheet with a thickness of 1.3mm is obtained;

[0028] (2) heat-treating the AZ31B magnesium alloy sheet obtained in step (1) at 250°C, keeping it warm for 60 minutes, and cooling it to room temperature with water;

[0029] (3) heating the AZ31B magnesium alloy thin plate after cooling in step (2) to 230° C., and performing electromagnetic induction heating treatment;

[0030] (4) Move the AZ31B magnesium alloy thin plate heated in step (3) into a cold mold kept a...

Embodiment 3

[0032] A method for bending and curling a magnesium alloy plate with a small radius, comprising the following steps:

[0033] (1) After heating the AZ31B magnesium alloy slab to 430°C, it is hot-rough rolled to 6.5mm, and the reduction ratio is 10% each time, and then hot-rolled to 3.8mm at 420°C, and the reduction ratio is 10% each time. %, if the temperature drops below 340°C, it needs to be reheated, and then hot finish rolling is carried out at 250°C, with a reduction rate of 5% each time, and finally an AZ31B magnesium alloy sheet with a thickness of 1.4mm is obtained;

[0034] (2) heat-treating the AZ31B magnesium alloy sheet obtained in step (1) at 255°C, keeping it warm for 60 minutes, and cooling it to room temperature with water;

[0035] (3) heating the AZ31B magnesium alloy thin plate after cooling in step (2) to 260° C., and performing electromagnetic induction heating treatment;

[0036] (4) Move the AZ31B magnesium alloy thin plate heated in step (3) into a col...

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Abstract

The invention discloses a small-radius bending and curling method of a magnesium alloy plate, which comprises the following steps: performing hot rough rolling, hot intermediate rolling and hot finish rolling on the magnesium alloy sequentially under corresponding temperature conditions; water cooling the thin plate to room temperature after heat treatment; Heating treatment at the edge of the curling; put it into a cold mold for forming and quenching, and complete the bending and curling of the magnesium alloy sheet. The present invention can adopt multiple heating methods to heat the curling part, and then combine the hot stamping forming process to carry out curling and bending, which can obviously improve the curling problem of the magnesium alloy plate, and has good surface quality and mechanical properties.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy processing, in particular to a small-radius bending and curling method of a magnesium alloy plate. Background technique [0002] With the rapid development of modern economy and society, people use more and more cars. Therefore, on the basis of car safety, comfort and environmental protection, higher requirements are put forward for the lightweight of cars. Magnesium and magnesium alloys have a series of excellent characteristics such as light weight, high specific strength, good impact resistance, excellent processability and high recovery rate, and become the most ideal materials for automobile lightweight. Since magnesium alloy sheets are mainly used for body panels, and the connection of magnesium alloy panels is mainly through bonding, curling and small-radius bending processes to achieve connection with parts, the curling process is very important. [0003] At present, in the automo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06B21D19/12B21D37/16B21B1/22
CPCB21B1/22B21D19/12B21D37/16C22F1/002C22F1/06
Inventor 权高峰刘崇亮范玲玲尹颢郭阳阳张钰雯茜鲁天慧张虹桃
Owner SOUTHWEST JIAOTONG UNIV
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