Thin-wall 6-series aluminum profile for rail transit vehicle body and preparation method thereof

A technology for rail transit and aluminum profiles, applied in the field of aluminum alloy manufacturing, can solve the problems of low extrusion efficiency and thick ring thickness, and achieve the effect of improving production efficiency, excellent toughness, and perfect combination of production efficiency and quality

Active Publication Date: 2018-12-07
中铝特种铝材(重庆)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, in order to solve the problems that the thinner the product wall thickness is, the lower the extrusion efficiency is and the thicker the coarse crystal ring is in the existing

Method used

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  • Thin-wall 6-series aluminum profile for rail transit vehicle body and preparation method thereof
  • Thin-wall 6-series aluminum profile for rail transit vehicle body and preparation method thereof
  • Thin-wall 6-series aluminum profile for rail transit vehicle body and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing a thin-walled 6-series aluminum profile for a rail transit car body, comprising the steps of:

[0034] A. Ingredients: Calculate the amount of each aluminum alloy raw material and prepare the aluminum alloy raw material according to the ratio. The ratio of the mass percentage of each element of the aluminum alloy raw material is as follows:

[0035] element

Si

Fe

Cu

mn

Mg

Cr

Zn

Ti

Impurities

Al

content

0.58

0.18

0.01

0.15

0.50

0.01

0.01

0.01

0.15

margin

[0036]B. Casting: Put the prepared aluminum alloy raw materials into the smelting furnace and mix them evenly to melt them into liquid aluminum alloys. After standing, refining, slag removal, online degassing, and filtering processes, the liquid aluminum alloys are cooled by semi-continuous water. The casting method melts and casts the liquid aluminum alloy into aluminum alloy casting rods. The diameter of t...

Embodiment 2

[0048] The difference between embodiment 2 and embodiment 1 is that, in step A, the mass percentage ratio of each element of the aluminum alloy raw material is as follows:

[0049] element

Si

Fe

Cu

mn

Mg

Cr

Zn

Ti

Impurities

Al

content

0.65

0.25

0.1

0.15

0.55

0.01

0.03

0.1

0.15

margin

[0050] Detect the aluminum profiles prepared in Example 2 of the present invention (such as figure 1 As shown), the test results are that the micrograin size of the aluminum profile prepared in Example 2 of the present invention at the position with a wall thickness of 1.2 mm is grade 4, and the micrograin size at the position with a wall thickness of 10 mm is grade 3.

[0051] The test results of the mechanical properties of the thin-walled 6-series aluminum profiles prepared in Example 2 are shown in Table 2.

[0052] Table II

[0053]

[0054]

Embodiment 3

[0056] The difference between embodiment 3 and embodiment 1 is that the mass percentage ratio of each element of the aluminum alloy raw material in step A is as follows:

[0057] element

Si

Fe

Cu

mn

Mg

Cr

Zn

Ti

Impurities

Al

content

0.50

0.01

0.01

0.03

0.45

0.01

0.01

0.01

0.15

margin

[0058] Detect the profiles prepared in Example 3 of the present invention (such as figure 2 shown), the test results are that the micrograin size of the aluminum profile prepared in Example 3 of the present invention is 4.5 at the wall thickness of 1 mm, and the micrograin size of the aluminum profile at the wall thickness of 10 mm is 3.5.

[0059] The test results of the mechanical properties of the thin-walled 6-series aluminum profiles prepared in Example 3 are shown in Table 3.

[0060] Table three

[0061]

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Abstract

The invention belongs to the technical field of aluminum alloy manufacturing, and relates to a thin-wall 6- series aluminum profile for a rail transit vehicle body and a preparation method thereof. The aluminum alloy comprises the following components in percentage by weight, 0.5-0.65% of Si, less than or equal to 0.25% of Fe, less than or equal to 0.10% of Cu, 0.03-0.15% of Mn, 0.45-0.55% of Mg,less than or equal to 0.05% of Cr, less than or equal to 0.05% of Zn, less than or equal to 0.10% of Ti, less than or equal to 0.05% of a single impurity, less than or equal to 15% of total impuritiesand the balance Al. The temperature of the homogenization treatment is 550-580 DEG C, the content of elements such as Mn and Cr is reduced, the recrystallization temperature in the alloy extrusion process is reduced, the nucleation density and the proportion of recrystallization of the aluminum profile in the wall thickness direction during extrusion of the aluminum profile are increased, the characteristic that recrystallization is easy to occur when the thin-wall sectional materials are extruded is fully utilized, a product with the uniform and consistent surface layer core grain structureis obtained in the extrusion process, and the method for improving the recrystallization temperature of the alloy by increasing the content of Mn and Cr elements is subverted.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy manufacturing, and relates to a thin-walled 6-series aluminum profile for a rail transit vehicle body and a preparation method thereof, in particular to a chemical composition design for improving production efficiency and microstructure of a 6-series aluminum alloy thin-walled profile. Background technique [0002] With the development of lightweight in the field of transportation, aluminum alloys with advantages such as low density, high specific strength, good extrudability, weldability, strong corrosion resistance, and low processing costs have been widely used in the field of transportation, while With the further lightening of tools in the field of transportation, the requirements for further "thin-wall lightweight" weight reduction of components are increasing, especially in the field of rail transit, where vehicles generally use 6N01 or 6005A alloy large-section hollow thin-wall extr...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C21/08C22C1/02C22F1/05
CPCC22C1/026C22C21/02C22C21/08C22F1/002C22F1/05
Inventor 吴博李洪涛
Owner 中铝特种铝材(重庆)有限公司
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