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Rapid bending forming method for magnesium alloy pipe under assistance of pulse current

A pulse current and bending forming technology, which is applied in furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as low dimensional accuracy and obvious rebound phenomenon, so as to improve work efficiency, reduce costs and energy, and refine grains Effect

Active Publication Date: 2022-03-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after bending at room temperature, the rebound phenomenon is obvious when unloading, and the dimensional accuracy is low

Method used

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  • Rapid bending forming method for magnesium alloy pipe under assistance of pulse current
  • Rapid bending forming method for magnesium alloy pipe under assistance of pulse current
  • Rapid bending forming method for magnesium alloy pipe under assistance of pulse current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of pulse electric current assisted AZ61 magnesium alloy tube rapid bending forming method, comprises the steps:

[0030] (1) Homogenize the AZ61 magnesium alloy pipe, including: heat preservation at 400°C for 1 hour, and then quench with water at 30-40°C to obtain the homogenized magnesium alloy pipe;

[0031](2) Fix the AZ61 magnesium alloy pipe material obtained in step (1) between the back-up roll and the bending die of the hydraulic pipe bender, connect the positive and negative poles of the pulse power supply at the symmetrical positions of the two ends of the pipe material, and feed in the current. Run the bending machine after the indication is stable. The bending radius is 120mm, the movement speed of the bending die is 8mm / s; the preset bending angle is 110.0°. The voltage is 6.0V, the current intensity is 3.5KA, the pulse width is 400μs, the frequency is 10.0kHz, the temperature of the deformation area is 140-165℃, and the time required for the process...

Embodiment 2

[0033] A kind of pulse electric current assisted AZ61 magnesium alloy tube rapid bending forming method, comprises the steps:

[0034] (1) Homogenize the magnesium alloy pipe, including: heat preservation at 400°C for 1 hour, and then quench with water at 30-40°C to obtain the homogenized magnesium alloy pipe;

[0035] (2) Fix the AZ61 magnesium alloy pipe material obtained in step (1) between the back-up roll and the bending die of the hydraulic pipe bender, connect the positive and negative poles of the pulse power supply at the symmetrical positions of the two ends of the pipe material, and feed in the current. Run the bending machine after the indication is stable. The bending radius is 120mm, the movement speed of the bending die is 8mm / s; the preset bending angle is 110.0°. The voltage is 6.0V, the current intensity is 4.0KA, the pulse width is 400μs, the frequency is 10.0kHz, the temperature of the deformation area is 170-200℃, and the time required for the process is ...

Embodiment 3

[0037] A kind of pulse electric current assisted AZ61 magnesium alloy tube rapid bending forming method, comprises the steps:

[0038] (1) Homogenize the magnesium alloy pipe, including: heat preservation at 400°C for 1 hour, and then quench with water at 30-40°C to obtain the homogenized magnesium alloy pipe;

[0039] (2) Fix the AZ61 magnesium alloy pipe material obtained in step (1) between the back-up roll and the bending die of the hydraulic pipe bender, connect the positive and negative poles of the pulse power supply at the symmetrical positions of the two ends of the pipe material, and feed in the current. Run the bending machine after the indication is stable. The bending radius is 120mm, the movement speed of the bending die is 8mm / s; the preset bending angle is 110.0°. The voltage is 6.0V, the current intensity is 4.4KA, the pulse width is 400μs, the frequency is 10.0kHz, the temperature of the deformation area is 225-250℃, and the time required for the process is ...

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Abstract

The invention provides a pulse current assisted rapid bending forming method for a magnesium alloy pipe, which comprises the following steps of: bending the homogenized magnesium alloy pipe, and introducing pulse current in the bending process. The bending die, the supporting roller and other die materials in contact with the magnesium alloy pipe are made of high-strength insulating ceramic materials. Compared with a traditional magnesium alloy bending process, the pulse current auxiliary bending forming is beneficial to promoting dislocation motion and recrystallization in the magnesium alloy plastic deformation process, the plastic forming performance of the high-strength light pipe can be improved, the problems of fracture and rebound when the magnesium alloy is bent at the room temperature are effectively solved, and the product size precision is high. And compared with a traditional low-plasticity alloy pipe hot bending technology, the whole technological process is simple and rapid, and good industrial application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of processing and forming of alloy profiles, and in particular relates to a rapid bending and forming method of magnesium alloy pipes assisted by pulse current. Background technique [0002] As one of the most concerned materials for industrial lightweighting, magnesium alloys have the advantages of high specific strength and specific stiffness, good vibration absorption and damping performance, and easy recycling. , folding chairs) and other fields that require lightweight alloys have broad application prospects. However, magnesium alloy is a new type of material and has poor formability at room temperature. When studying its plastic forming problem, many data accumulated in previous research cannot be directly applied. Therefore, it is of great significance to carry out research on bending forming of magnesium alloy pipe fittings. . [0003] The bending forming of magnesium alloy pipe is a typical plasti...

Claims

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Application Information

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IPC IPC(8): B21D7/06B21D7/12B21D7/16C21D9/08C22C23/02C22F1/06C22F3/00
CPCB21D7/06B21D7/12B21D7/162C22F1/06C22F1/002C21D9/085C22C23/02C22F3/00
Inventor 徐虹任思宇王玉鹏闫荣辉白明马品奎程秀明
Owner JILIN UNIV
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