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Magnetic pulse treatment method for reducing residual stress of magnesium alloy plate

A technology of residual stress and treatment method, which is applied to magnetic pulse treatment to reduce residual stress of magnesium alloy sheets, residual stress generated during extrusion and cooling, and deformed magnesium alloys in the field of rolling, which can solve the problem of weak magnetic field response and paramagnetic properties. The effect of material effect is not obvious, so as to achieve the effect of no damage to the appearance, optimization of the reduction process, and realization of residual stress

Inactive Publication Date: 2020-05-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, pulsed magnetic fields, especially strong pulsed magnetic fields, have been applied to reduce the residual stress of ferromagnetic materials. All of them are rectangular wave, sine wave or alternating waveform. For paramagnetic materials such as magnesium alloy, due to its weak magnetic field response, the effect on paramagnetic materials is not obvious, and it is rarely used to reduce the residual stress of paramagnetic materials. There are reports

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  • Magnetic pulse treatment method for reducing residual stress of magnesium alloy plate
  • Magnetic pulse treatment method for reducing residual stress of magnesium alloy plate
  • Magnetic pulse treatment method for reducing residual stress of magnesium alloy plate

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Embodiment 1

[0047] In this embodiment, a magnetic pulse treatment method for reducing the residual stress of a magnesium alloy plate according to the present invention is used to perform residual stress reduction treatment on a 150mm×250mm×4.5mm magnesium alloy AZ31 rolled plate, and the specific steps are as follows:

[0048] (1) First, carry out residual stress detection on the AZ31 magnesium alloy rolled plate before the reduction treatment, and design the installation position of the magnetic pulse generator according to the detection results, and perform reduction treatment on the stress concentration part;

[0049] (2) Connect the programmable control pulse DC power supply output device and the magnetic pulse generator with a power transmission cable, and turn on the water cooling system;

[0050] (3) Set the pulse frequency to 10Hz through PLC programming, turn on the programmable control pulse DC power output device, adjust the pulse voltage to 300V, and the processing time is 60mi...

Embodiment 2

[0052] In this embodiment, a magnetic pulse treatment method for reducing the residual stress of a magnesium alloy plate according to the present invention is used to perform residual stress reduction treatment on a 150mm×250mm×4.5mm magnesium alloy AZ31 rolled plate, and the specific steps are as follows:

[0053] (1) First, carry out residual stress detection on the AZ31 magnesium alloy rolled plate before the reduction treatment, and design the installation position of the magnetic pulse generator according to the detection results, and perform reduction treatment on the stress concentration part;

[0054] (2) Connect the programmable control pulse DC power supply output device and the magnetic pulse generator with a power transmission cable, and turn on the water cooling system;

[0055] (3) Set the pulse frequency to 20Hz through PLC programming, turn on the programmable control pulse DC power output device, adjust the pulse voltage to 300V, and the processing time is 60mi...

Embodiment 3

[0057] In this embodiment, a magnetic pulse treatment method for reducing the residual stress of magnesium alloy plates according to the present invention is used to perform residual stress reduction treatment on extruded plates of magnesium alloy AZ31 with a size of 250mm×60mm×8mm. The specific steps are as follows:

[0058] (1) First, carry out residual stress detection on the AZ31 magnesium alloy rolled plate before the reduction treatment, and design the installation position of the magnetic pulse generator according to the detection results, and perform reduction treatment on the stress concentration part;

[0059] (2) Connect the programmable control pulse DC power supply output device and the magnetic pulse generator with a power transmission cable, and turn on the water cooling system;

[0060] (3) Set the pulse frequency to 5Hz through PLC programming, turn on the programmable control pulse DC power output device, adjust the pulse voltage to 200V, and the processing ti...

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Abstract

The invention belongs to the technical field of magnesium alloy plate processing methods, relates to a magnetic pulse treatment method for reducing residual stress of a magnesium alloy plate, and is particularly suitable for treating residual stress generated in the rolling, extruding and cooling processes of wrought magnesium alloy to finally meet the quality requirements of wrought magnesium alloy plate of users. According to the target requirement, corresponding magnetic pulse waveform, pulse frequency, pulse voltage and action time are matched, the residual stress of the magnesium alloy plate can be reduced, and the method is suitable for reducing residual stress of plates on an on-site rolling or extrusion production line and is also suitable for reducing residual stress of large magnesium alloy welding structural parts and casting parts. According to the method, the process is simple, programmable control can be achieved, a non-contact and non-destructive external field integraleffect is achieved, and the method is a nondestructive stress reduction method.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy plate processing methods, and relates to a magnetic pulse treatment method for reducing the residual stress of magnesium alloy plates, which is especially suitable for the residual stress generated in the rolling, extrusion and cooling processes of deformed magnesium alloys, and finally meets the requirements Quality requirements for users of wrought magnesium alloy sheets. Background technique [0002] Magnesium alloys can be hot deformed by forging, extrusion, rolling and other processes. Under the action of three-dimensional compressive stress, casting defects such as shrinkage cavities, porosity, and pores in the ingot can be eliminated, and at the same time, the formation and expansion of crack sources can be inhibited, the structure is more uniform, and the mechanical properties are improved. When the magnesium alloy is deformed, the deformation of the material along the cross-secti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
CPCC22F1/06
Inventor 罗天骄杨院生闫锰王聪李应举冯小辉黄秋燕
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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