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High strength easy-to-cut aluminum alloy

An aluminum alloy and easy-cutting technology, which is applied in the field of high-strength easy-cut aluminum alloys, can solve problems such as restrictions on the use of lead-containing easy-to-machining aluminum alloys, achieve excellent corrosion resistance and weldability, low production costs, and expand application fields Effect

Active Publication Date: 2008-11-19
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
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AI Technical Summary

Problems solved by technology

However, as people pay more attention to environmental issues, the processing waste of lead-containing aluminum alloys and the recycling of old parts have become a major obstacle to its application in automobiles. Foreign countries have issued laws and regulations, and major industrial countries will prohibit artificial processing before the end of 2006. The production and use of lead free-cutting aluminum alloys make the use of lead-containing easy-cutting aluminum alloys subject to greater restrictions

Method used

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Examples

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Embodiment Construction

[0022] A high-strength free-cutting aluminum alloy, the composition of which is Si: 0.2%-1.0%; Cu: 0.10%-0.60%; Mg: 0.6%-1.5%; Sn: 0.2%-1.0%; Bi: 0.2% %-1.0%; Cr: 0.02%-0.2%; Zn: ≤0.25%; Mn: ≤0.15%; Ti: ≤0.08%, the balance is aluminum, and the sum of other impurity elements is less than 0.13%. The present invention is described in further detail below in conjunction with example:

[0023] Ingot casting, extrusion and heat treatment are carried out according to the specific alloy composition. The specific process is as follows: primary aluminum melting→alloying treatment→semi-continuous ingot casting→homogenization treatment→extrusion→solution treatment→artificial aging.

[0024] The specific process is: heat the primary aluminum in a resistance furnace, alloy it after the primary aluminum is melted, carry out semi-continuous casting at 690-750°C after refining, homogenize the casting billet before extrusion, and pass through 520 After homogenization treatment at -540°C, hot e...

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Abstract

The invention relates to a high-strength easy-cutting aluminium alloy. The invention is characterized in that the aluminium alloy is an aluminium-base alloy, containing bismuth, tin, copper, silicon and chromium as alloying elements, and other unavoidable impurity elements. A product produced by the alloy has good easy-cutting capability, excellent mechanical property, excellent corrosion resistance and excellent solderability. The aluminium alloy has low production cost and is equivalent to the prior leady aluminium alloy, so the aluminium has competitive advantages in domestic and foreign markets; The aluminium alloy product can replace partial leady aluminium alloys, thereby not only facilitating the reclamation when the product is consumed completely so as to reduce lead pollution, but also facilitating the expansion of the application field of aluminium alloy products. The aluminium alloy also can replace partial leady easy-cutting aluminium alloys, such as 2011 or 6262 leady aluminium alloy and so on.

Description

technical field [0001] The invention relates to a high-strength free-cutting aluminum alloy. Background technique [0002] Traditional free-cutting aluminum alloys are made by adding a small amount of Pb and Bi on the basis of 2XXX and 6XXX series alloys. For example, 0.5% Pb and 0.5% Bi are contained in the 2011 alloy. These alloying elements form a low-melting eutectic phase in the aluminum alloy. The heat generated during processing can make these eutectic phases semi-melt, so that in the processing tool / processing Fine debris is formed on the interface of the workpiece to achieve the machinability of the workpiece; and in the 6XXX alloy, if the same content of Pb and Bi is added on the basis of 6061, that is, the 6262 alloy, compared with 2011, the alloy has improved. Excellent corrosion resistance, machinability, toughness and anodic response. However, as people pay more attention to environmental issues, the processing waste of lead-containing aluminum alloys and the...

Claims

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Application Information

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IPC IPC(8): C22C21/00B22D21/04C22F1/04
Inventor 姚素娟任智森李玉斌
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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