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Cryogenic machining method for improving strength and plasticity of 3003 aluminum alloy plate

A technology of aluminum alloy sheet and processing method, applied in metal processing equipment, metal rolling, manufacturing tools, etc., can solve the problems of limited application, low tensile strength, reduced elongation, etc., to increase dislocation density, improve mechanical properties, the effect of increasing tensile strength and elongation

Pending Publication Date: 2021-01-01
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tensile strength of 3003 aluminum alloy is low, only slightly higher than industrial pure aluminum, which greatly limits the application of 3003 aluminum alloy in other fields
Among these deformation strengthening techniques, equal channel angular extrusion and high-pressure torsion methods are only suitable for small samples, and the cost is extremely high, and it is impossible to realize the forming process of large plates
The cumulative rolling process is complicated, and the bonding strength of the bonding surface is low
The strength of the plate processed by the cumulative rolling process can be significantly improved, but when the tensile strength is higher than 160MPa, its elongation is lower than 5%
For the aluminum alloy plate processed by ordinary rolling process, its tensile strength increases with the increase of strain, but its elongation decreases significantly with the increase of deformation
Therefore, these deformation strengthening methods have limited the application fields of 3003 aluminum alloy.

Method used

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  • Cryogenic machining method for improving strength and plasticity of 3003 aluminum alloy plate
  • Cryogenic machining method for improving strength and plasticity of 3003 aluminum alloy plate
  • Cryogenic machining method for improving strength and plasticity of 3003 aluminum alloy plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1. First pour liquid nitrogen into the iron tank. After the vaporization of liquid nitrogen is stable, soak 3003 aluminum alloy plates with length, width and thickness of 100mm, 50mm and 6mm respectively in liquid nitrogen for 10 minutes.

[0022] Step 2. Coat the surface of the rolls of the rolling mill with lubricating oil, start the rolling mill, and set the rotational speed of the rolls to 0.5 m / min.

[0023] Step 3. After the rolls rotate evenly, roll and deform the 3003 aluminum alloy plate soaked in liquid nitrogen for 10 minutes. The total rolling deformation is 30% of the original plate thickness of 3003 aluminum alloy, and rolling is carried out in 3 passes, and the deformation amount of each pass is 10% of the original plate thickness. After each rolling pass, the rolled samples were quickly soaked in liquid nitrogen for 10 minutes. After soaking, the next rolling deformation is carried out. The test can be stopped until the total deformation reaches 3...

Embodiment 2

[0026] Step 1. First pour liquid nitrogen into the iron tank. After the vaporization of liquid nitrogen is stable, soak 3003 aluminum alloy plates with length, width and thickness of 100mm, 50mm and 6mm respectively in liquid nitrogen for 10 minutes.

[0027] Step 2. Coat the surface of the rolls of the rolling mill with lubricating oil, start the rolling mill, and set the rotational speed of the rolls to 0.5 m / min.

[0028] Step 3. After the rolls rotate evenly, roll and deform the 3003 aluminum alloy plate soaked in liquid nitrogen for 10 minutes. The total rolling deformation is 50% of the original plate thickness of 3003 aluminum alloy, and the rolling is carried out in 5 passes, and the deformation amount of each pass is 10% of the original plate thickness. After each rolling pass, the rolled samples were quickly soaked in liquid nitrogen for 10 minutes. After soaking, the next rolling deformation is carried out. The experiment can be stopped until the total deformation...

Embodiment 3

[0031] Step 1. First pour liquid nitrogen into the iron tank. After the vaporization of liquid nitrogen is stable, soak 3003 aluminum alloy plates with length, width and thickness of 100mm, 50mm and 6mm respectively in liquid nitrogen for 10 minutes.

[0032] Step 2. Coat the surface of the rolls of the rolling mill with lubricating oil, start the rolling mill, and set the rotational speed of the rolls to 0.5 m / min.

[0033] Step 3. After the rolls rotate evenly, roll and deform the 3003 aluminum alloy plate soaked in liquid nitrogen for 10 minutes. The total rolling deformation is 70% of the original plate thickness of 3003 aluminum alloy, and rolling is carried out in 7 passes, and the deformation amount of each pass is 10% of the original plate thickness. After each rolling pass, the rolled samples were quickly soaked in liquid nitrogen for 10 minutes. After soaking, the next rolling deformation is carried out. The experiment can be stopped until the total deformation rea...

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Abstract

The invention relates to a cryogenic machining method for improving the strength and plasticity of a 3003 aluminum alloy plate. The cryogenic machining method comprises the following steps that (1) the 3003 aluminum alloy plate is putted into a muffle furnace, the 3003 aluminum alloy plate is heated from the room temperature to 590 DEG C along with the furnace, heat preservation is conducted for 6h, and then the 3003 aluminum alloy plate is subjected to water cooling to the room temperature; (2) the 3003 aluminum alloy plate subjected to heat treatment in the step (1) is placed in liquid nitrogen to be soaked for 10 min, the soaked 3003 aluminum alloy plate is subjected to cryogenic cooling rolling through a two-roll mill, rolling is conducted in a multi-pass rolling mode, the rolling reduction of each pass is 9%-11% of the original thickness, and after rolling of each pass is completed, the 3003 aluminum alloy plate is rapidly placed in liquid nitrogen to be soaked for 10 min, and then the next pass of rolling is conducted; and (3) the room temperature stretching is conducted on the 3003 aluminum alloy plate rolled in the step (2). According to the 3003 aluminum alloy plate prepared through the cryogenic machining method, and the strength and plasticity of the plate can be remarkably improved at the same time.

Description

technical field [0001] The invention belongs to the technical field of processing aluminum alloys, in particular to a cryogenic processing method for simultaneously improving the strength and plasticity of 3003 aluminum alloy plates. Background technique [0002] 3003 aluminum alloy is a wrought aluminum alloy that cannot be strengthened by heat treatment, but can be strengthened by deformation processing. 3003 aluminum alloy has good corrosion resistance, electrical conductivity, thermal conductivity and welding performance, and is widely used in pressure vessels and pipelines, engineering machinery exchangers, aircraft fuel tanks and oil pipelines, etc. The tensile strength of 3003 aluminum alloy is low, only slightly higher than industrial pure aluminum, which greatly limits the application of 3003 aluminum alloy in other fields. [0003] The 3003 aluminum alloy used as a structural material must have high strength and good plasticity. The current strengthening technolog...

Claims

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Application Information

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IPC IPC(8): B21B1/22B21B45/00B21B45/02B21B3/00C22C21/00C22F1/04
CPCB21B1/22B21B45/004B21B45/023B21B3/00C22C21/00C22F1/04C22F1/002B21B2001/221B21B2003/001
Inventor 谭元标杨亚杨秋月向嵩石维张文玮
Owner GUIZHOU UNIV