High-performance aluminium alloy material for automatic transmission and preparation method thereof

An aluminum alloy material and high-performance technology, which is applied in the field of alloy materials, can solve problems such as slow reaction speed, oil pressure fluctuations, oil circuit collusion, etc., and achieve the goals of reducing porosity, improving mechanical properties, air tightness and mechanical properties Effect

Active Publication Date: 2014-07-09
自贡市川力科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Transmission oil pumps, valve plates, and valve cores are not allowed to have air holes, cold shuts, and penetrating defects. Otherwise, there will be oil circuit collusion and oil pressure fluctuations, which will lead to fatal defects such as difficulty in shifting gears and slow response speeds in the transmission, which will affect driving safety. sex, comfort

Method used

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  • High-performance aluminium alloy material for automatic transmission and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]A high-performance aluminum alloy material, the material is Al-Si-Cu aluminum alloy, the alloy contains the following elements in mass percentage: Si: 12%; Cu: 3.5%, rare earth element RE: 0.25%, The rest is Al. Prepare the aluminum alloy material according to the following specific steps:

[0038] A Fully preheat and bake the charge and smelting tools to remove impurities such as moisture and oil;

[0039] B mixes ingredients according to the formula and puts them into the melting furnace for smelting, in which rare earths only account for 1 / 2 of the total amount of rare earths;

[0040] C remove slag, purify, aluminum liquid is transferred to holding furnace;

[0041] D Preheat the remaining rare earth and add it to the molten aluminum in the holding furnace, stir it fully and let it stand for 20 minutes;

[0042] E-press mold vacuum treatment;

[0043] F blank die-casting.

[0044] The above materials are used to manufacture the transmission oil pump, the valve p...

Embodiment 2

[0069] A high-performance aluminum alloy material, the mass percentage of each element in the alloy is as follows:

[0070] Si: 7.5%; Cu: 1.5%; Fe: 0.8%; Mn: 0.5%; Mg: 0.3%; Zn: 1.0%; Cr: 0.5%; Ni: 0.5%; Pb: 0.1%; RE: 0.3%; Sn: 0.1%, the rest is Al. Alloy materials and transmission oil pumps, valve plate assemblies, valve core assemblies, or engine water pumps were prepared according to the method described in Example 1. The tensile strength of the obtained material σ b ≥290Mpa, elongation δ≥2.8%, hardness HB≥100, porosity less than 0.1%, and thermal stability better than that of the material prepared in Example 1; the wear resistance, air tightness and service life of the corresponding product Also obviously improved with respect to embodiment 1.

Embodiment 3

[0072] In the formula described in Example 2, the content of each alloy element was individually adjusted, and the performance of the corresponding alloy material was investigated. The results show:

[0073] Silicon is the main element in most die cast aluminum alloys. It improves the castability of the alloy. Silicon and aluminum can form a solid solution. The formation of eutectics between silicon and aluminum can improve the high-temperature moldability of the alloy, reduce shrinkage, have no tendency to thermal cracking, and have high corrosion resistance. However, when the silicon content in the alloy exceeds the eutectic composition, and there are many impurities such as copper and iron, hard spots of free silicon will appear, making cutting and processing difficult, and the high-silicon aluminum alloy has a serious corrosion effect on the casting crucible.

[0074] Copper and aluminum form a solid solution, which has the functions of solid solution strengthening and ...

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Abstract

The invention discloses a high-performance aluminium alloy material. The high-performance aluminium alloy material is Al-Si-Cu aluminium alloy and also contains a rare earth element RE with the mass percentage of 0.25%-0.45%. The high-performance aluminium alloy material disclosed by the invention has the advantages that through purification of the rare earth element, metamorphism and microalloying, the porosity of the material is greatly reduced, and the mechanical performance of the material is improved. Compared with the air impermeability and mechanical performance of existing products, the air impermeability and mechanical performance of transmission oil pumps, valve plate components, valve core components or engine water pumps which are manufactured by using the material are obviously improved.

Description

technical field [0001] The invention relates to a high-performance aluminum alloy material for an automatic transmission and a preparation method thereof, belonging to the field of alloy materials. technical background [0002] Al-Si-Cu aluminum alloy has the characteristics of small crystallization temperature interval, small linear shrinkage coefficient, good mold filling ability, and low tendency of thermal cracking and shrinkage porosity. It is currently the most widely used die-casting aluminum alloy. It has the advantages of 1. Wide range of die-casting; 2. High dimensional accuracy of castings and low surface roughness; 3. High productivity; 4. High metal utilization; 5. High strength and surface hardness of castings. [0003] However, when aluminum alloy is smelted, substances such as returned materials, residual oil, and organic matter will react with aluminum ingots to generate harmful substances such as H; when the hydrogen content exceeds the solubility saturatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04C22C1/02
Inventor 施洋王晓兵何宁刘剑
Owner 自贡市川力科技股份有限公司
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