Hot Top Casting Process of 7xxx Series Superhard Aluminum Alloy Round Rod with φ784mm

A hard aluminum alloy and hot top casting technology, which is applied in the field of metal material forming, can solve the problems of bright crystal grains, loose pores, etc., and achieve the effect of reducing the internal stress of casting

Active Publication Date: 2017-12-22
CHINA ZHONGWANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to provide a hot-top casting process for 7xxx series superhard aluminum alloy round rods with a diameter of 784 mm. cracks, composition segregation, bright crystal grains, coarse grains, loose pores and other defects, and the use of hot top casting solves the defects of surface segregation, coarse grain layer thickness, etc., greatly improving the yield and production efficiency, and reducing casting costs

Method used

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  • Hot Top Casting Process of 7xxx Series Superhard Aluminum Alloy Round Rod with φ784mm
  • Hot Top Casting Process of 7xxx Series Superhard Aluminum Alloy Round Rod with φ784mm

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Effect test

Embodiment 1

[0039] The hot-top casting process of the 7xxx series superhard aluminum alloy round rod, the aluminum alloy round rod contains the following chemical components by mass: Si 0.25%; Fe 0.4%; Cu 1.6%; Mn 0.25%; Mg 2.6%; Cr 0.2%; Zn 5.6%; Ti 0.15%; Zr 0.03%; Al balance.

[0040] Its preparation process comprises the following steps:

[0041] a. Material preparation: select low-iron and low-silicon aluminum ingots, aluminum-manganese alloys, aluminum-copper master alloy ingots, aluminum-lead master alloy ingots and magnesium ingots according to the ratio;

[0042] b. Smelting: Add other raw materials except magnesium ingots to the furnace for smelting, the melting temperature is 760°C, and add magnesium ingots after complete melting, refining and slag removal;

[0043] c. Stirring: the electromagnetic stirrer is used to stir to ensure that the raw materials in the furnace can be melted quickly and the temperature is uniform;

[0044] d. Refining: the refining process includes s...

Embodiment 2

[0057] The hot-top casting process of the 7xxx series superhard aluminum alloy round rod, the aluminum alloy round rod contains the following chemical components by mass: Si 0.25%; Fe 0.4%; Cu 1.55%; Mn 0.25%; Mg 2.55%; Cr0.19%; Zn5.6%; Ti0.15%; Zr0.03%; Al balance.

[0058] Its preparation process comprises the following steps:

[0059] a. Material preparation: select low-iron and low-silicon aluminum ingots, aluminum-manganese alloys, aluminum-copper master alloy ingots, aluminum-lead master alloy ingots and magnesium ingots according to the ratio;

[0060] b. Smelting: Add other raw materials except magnesium ingots to the furnace for smelting, the melting temperature is 755°C, and add magnesium ingots after complete melting, refining and slag removal;

[0061] c. Stirring: the electromagnetic stirrer is used to stir to ensure that the raw materials in the furnace can be melted quickly and the temperature is uniform;

[0062] d. Refining: the refining process includes s...

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Abstract

The invention discloses a hot-top casting process for a 7xxx series superhard aluminum alloy round rod with a diameter of 784mm. The aluminum alloy round rod contains the following chemical components by mass: Si 0.25%; Fe 0.4%; Cu 1.55-1.65%; Mn 0.25%; Mg 2.55-2.65%; Cr 0.19-0.25%; Zn 5.6-5.7%; Ti 0.15%; Zr 0.03%; d, refining; e, slag removal; f, heat preservation and standing; g, on-line refinement; h, on-line degassing; i, filtration; j, casting; k, homogeneous treatment. The process disclosed by the invention solves the defects such as cracks, component segregation, bright crystal grains, coarse grains, and loose pores that often occur when the large-diameter superhard aluminum alloy adopts the direct condensation casting technology, and the hot top casting solves the surface segregation Defects such as nodules and coarse grain thickness.

Description

technical field [0001] The invention belongs to the field of metal material forming, and relates to an aluminum alloy casting method, in particular to a hot-top casting process for a 7xxx series superhard aluminum alloy round bar with a diameter of 784 mm. Background technique [0002] 7xxx series aluminum alloys have the advantages of high specific strength and hardness, good thermal processing performance, excellent welding performance, good corrosion resistance and high toughness, etc., and should be made into structural materials with greater bearing capacity and widely used In the aerospace industry and other civil industrial fields. [0003] Although the strength of 7xxx series aluminum alloys is superior to that of 6XXX series aluminum alloys, the tensile strength and yield strength of some alloys can reach more than 400MPa, but the tensile strength and yield strength of 7xxx series aluminum alloys both reach 400MPa or more, after anodic oxidation, the surface The qu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C1/03C22C1/06B22D11/00C22F1/053
CPCB22D11/003C22C1/026C22C1/03C22C1/06C22C21/10C22F1/053
Inventor 马青梅盖洪涛李菁菁叶尚英李伟
Owner CHINA ZHONGWANG
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