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Production method of aluminium alloy hot extrusion bar used for high-quality aviation blade

An aviation blade and manufacturing method technology, applied in the field of aluminum alloy hot extrusion bar manufacturing, can solve the problems of large ingot crack tendency, many extrusion crack scraps, compound segregation, etc., achieve light surface corrosion and solve casting cracks , Improve the effect of melt quality

Active Publication Date: 2015-10-07
NORTHEAST LIGHT ALLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of severe compound segregation, large deformation resistance, large ingot crack tendency, many extrusion crack waste products and slow extrusion speed existing in the existing 7075 alloy, and provides a high-quality aluminum alloy hot extrusion for aviation blades. Manufacturing method of pressed rod

Method used

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  • Production method of aluminium alloy hot extrusion bar used for high-quality aviation blade
  • Production method of aluminium alloy hot extrusion bar used for high-quality aviation blade
  • Production method of aluminium alloy hot extrusion bar used for high-quality aviation blade

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specific Embodiment approach 1

[0018] Embodiment 1: The manufacturing method of the aluminum alloy hot-extruded bar for high-quality aviation blades of the present embodiment is realized according to the following steps:

[0019] 1. Preparation of aluminum alloy melt: determination of chemical composition, the mass percentage of each element in the aluminum alloy is Zn: 5.20% ~ 6.00%, Mg: 2.30% ~ 2.80%, Cu: 1.30% ~ 1.80%, Mn: ≤ 0.25 %, Cr: 0.19% ~ 0.25%, Ti: ≤ 0.10%, Fe: ≤ 0.45%, Si: ≤ 0.25%, single impurity: ≤ 0.05%, total impurity: ≤ 0.15%, the rest is Al; according to the above elements The mass percentage of high-purity aluminum ingot, electrolytic copper, pure magnesium ingot, pure zinc ingot, Al-Cr master alloy, Al-Ti-B wire, Al-Be and remelting material of 7075 alloy or one part of 7075 alloy were weighed respectively. Grade scrap is used as raw material, and then added to the smelting furnace, and smelted into aluminum alloy melt at 720℃~800℃;

[0020] 2. Hot top casting of round ingots: The alumin...

specific Embodiment approach 2

[0032] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass percentage of each element in the aluminum alloy in step 1 is Zn: 5.60%, Mg: 2.50%, Cu: 1.50%, Mn: ≤ 0.25%, Cr: 0.22%, Ti: ≤ 0.10%, Fe: ≤ 0.45%, Si: ≤ 0.25%, individual impurities: ≤ 0.05%, total impurities: ≤ 0.15%, and the rest are Al. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0033] Embodiment 3: This embodiment is different from Embodiment 1 or 2 in that the specifications of the two-stage ceramic sheets in Step 2 are 30ppi and 60ppi, respectively. Other steps and parameters are the same as in the first or second embodiment.

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Abstract

The invention discloses a production method of an aluminium alloy hot extrusion bar used for a high-quality aviation blade, and relates to a production method of an aluminium alloy hot extrusion bar, aiming at solving the problems of serious segregation, strong deformation resistance, large ingot cracking tendency, excessive extrusion cracking scrap and low extrusion speed. The method comprises the following steps: preparation of molten aluminium alloy, hot top casting of a circular ingot, homogenizing annealing of the ingot, hot extrusion of a bar, finishing of the bar, T73 thermal treatment, AA-level flaw detection. The alloy component of the aluminium alloy hot extrusion bar produced according to the method can meet standard requirement, and thus solving the problem of casting crack of circular ingots, improving the hot-working character of short ingots, and reducing compound segregation scrap and extrusion cracking scrap; stress corrosion resistance can be continuously realized in 30 days and nights, surface corrosion is relatively light, and the percent of pass of an oxidized surface after a component of a forge piece of a user is machined.

Description

technical field [0001] The invention relates to a manufacturing method of an aluminum alloy hot extrusion bar. Background technique [0002] Alloy 7075 is a typical representative alloy of Al-Zn-Mg-Cu series, and it is an indispensable material in the aerospace industry. 7075 aluminum alloy is a heat treatment strengthened aluminum alloy with many characteristics: 1. High mechanical properties at room temperature: 7075 alloy is called high-strength aluminum alloy, and its tensile strength is R m =500~600MPa, yield strength R P0.2 = 450 ~ 550MPa, elongation A = 6 ~ 15%, HB = 130 ~ 180, this feature makes it occupy a more important position in the aerospace field, it can be used to replace low carbon steel, such as the start of the aircraft. Drop frame, etc. 2. Wide solution temperature: 7075 alloy has low quenching sensitivity, and satisfactory performance can be obtained when quenched at 450-480 °C. 3. Higher aging hardening effect: After quenching and artificial aging, ...

Claims

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Application Information

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IPC IPC(8): B21C23/08B21C35/03C22C21/10C22F1/053
Inventor 张燕飞刘记伟高新宇张宇树刘科研李德贵任丽媛李浩言高宝亭陈雷
Owner NORTHEAST LIGHT ALLOY CO LTD
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