Die-casting aluminium alloy

A technology for casting aluminum alloys and alloys, which is applied in the field of aluminum alloys for die-casting, can solve the problems of limited mobility of aluminum alloys, high cost, waste of resources and energy, etc.

Inactive Publication Date: 2005-04-20
ALLOY MATERIALS LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The raw material price of magnesium alloy is slightly more expensive per kilogram than that of aluminum alloy
[0005] 2. The first-class waste of magnesium alloy castings (about 1.5-2 times the weight of the finished product) is difficult to recycle and remelt in the factory due to the increase in the content of impurities (such as iron, nickel, copper, silicon) and oxides. Therefore, the weight ratio of the magnesium alloy used from the feed to the finished product is extremely low, about 35% to 40%, resulting in a huge waste of resources and ene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to the composition range in Table 1, pure aluminum, pure silicon, pure copper and aluminum-nickel master alloy are melted in an electric crucible furnace, degassed and slag removed, and die-casted by a die-casting machine into a casting with a thickness of 0.8mm and an area of ​​200×300mm. sliced ​​into 20 rectangular pieces of 20mm×150mm, and then turned into 20 sheet-like tensile test pieces, each of which has a gage of 12.5mm in width and 50mm in length. The average mechanical properties obtained are as follows shown in the table.

[0034] silicon

[0035] Note: use weight percentage (wt.%)

Embodiment 2

[0037] According to the composition range in Table 2 and the melting and casting procedure in Example 1, die-cast into a cast piece with a thickness of 0.8mm and an area of ​​200×300mm. After slicing, it is divided into 20 rectangular pieces of 20mm×150mm, and then turned into a sheet-shaped tensile test piece 20 Each test piece has a gage with a width of 12.5mm and a length of 50mm. The average values ​​of the obtained mechanical properties are shown in the table.

[0038] silicon

[0039] Note: use weight percentage (wt.%)

Embodiment 3

[0041] According to the composition range in Table 3 and the melting and casting procedure in Example 1, die-cast into a cast piece with a thickness of 0.8mm and an area of ​​200×300mm. After slicing, it is divided into 20 rectangular pieces of 20mm×150mm, and then turned into a sheet-shaped tensile test piece 20 Each test piece has a gage with a width of 12.5mm and a length of 50mm. The average values ​​of the obtained mechanical properties are shown in the table.

[0042] silicon

[0043] Note: use weight percentage (wt.%)

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Abstract

A aluminium alloy for press casting very thin parts (0.7-1.2 mm) is composed of (by weight) 10.0-14.0 % of silicon, 2.5-4.5 % of copper, 0-2.0 % of nickel, 0-1.5 % of manganese, the total content of nickel and manganese keeps in 0.5-2.0 %. The alloy castability (mold filling ability) increases by more than 20 %. Under high pressure press casting, 0.7-1.2 mm wall casting can be made and can be used as casing of 3C products, also the cost is reduced by more than 20-30 % compared with magnesium alloy.

Description

technical field [0001] The present invention relates to aluminum alloy for die-casting, in particular to an aluminum alloy for die-casting extremely thin parts. Background technique [0002] In recent years, the 3C industry has developed rapidly. Among them, the casings of notebook computers, digital cameras, and communication mobile phones all require the characteristics of lightness, thinness, and anti-electromagnetic radiation. For this reason, magnesium alloys and aluminum alloys are widely used to make molded parts through high-pressure die-casting. . In the past two years, the trend has been to move towards magnesium alloys, because castings of the same thickness are about 30% lighter than aluminum alloys. Another factor is that the fluidity of aluminum alloy components in various countries in the world is relatively limited. Even under high-pressure die-casting, it is difficult to achieve a thickness of less than 1mm, which cannot meet the requirements of some casing...

Claims

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Application Information

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IPC IPC(8): C22C21/02
Inventor 方魁燦
Owner ALLOY MATERIALS LAB
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