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A 2-series aluminum alloy profile for the lower girder of a civil aircraft wing and its manufacturing method

A technology of aluminum alloy profiles and manufacturing methods, which is applied in the field of manufacturing aluminum alloy profiles for civil aircraft, and can solve the problem of late start, insufficient understanding of the performance and requirements of the lower girders of civil aircraft wings, and the inability to meet the requirements of the use of lower girders of civil aircraft wings Requirements and other issues to achieve the effect of reducing residual stress and enhancing lateral performance

Active Publication Date: 2021-07-09
SHANDONG NANSHAN ALUMINUM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology does not carry out process optimization and performance improvement according to the service conditions and performance requirements of the 2-series aluminum alloy profiles used for the wing girders in China's civil aircraft manufacturing, so it cannot meet the use requirements of the civil aircraft wing girders
[0009] The reason is that the domestic civil aviation industry started relatively late and lacked the demand for the use of the under-wing girders of civil aircraft. As a result, aluminum profile manufacturers did not fully understand the performance and requirements of the under-wing girders of civil aircraft, and did not invest in them. Sufficient time and effort are required for relevant research and development, therefore, it will not be possible to produce profiles that fully meet the requirements for the use of long stringers under the wings of civil aviation for a long time

Method used

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  • A 2-series aluminum alloy profile for the lower girder of a civil aircraft wing and its manufacturing method
  • A 2-series aluminum alloy profile for the lower girder of a civil aircraft wing and its manufacturing method
  • A 2-series aluminum alloy profile for the lower girder of a civil aircraft wing and its manufacturing method

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Experimental program
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Effect test

Embodiment 1

[0046] Step 1: Use the semi-continuous casting method to produce large-scale 2-series ingots with all indicators meeting the technical specifications, and perform homogenization annealing. Chemical analysis of the ingot revealed that the Si content was 0.042%, the Fe content was 0.051%, the Cu content was 3.86%, the Mg content was 1.24%, the Mn content was 0.54%, the Cr content was 0.0072%, the Ti content was 0.044%, and the Zr content was 0.113%. ;

[0047] Step 2: Heat and heat-preserve the mold with a box-type mold heating furnace to ensure that the core of the mold is warm and the mold temperature is heated to 390°C;

[0048] Step 3: The temperature of the extrusion cylinder is set at 400°C. Extrusion can only be carried out after the temperature reaches. The set temperature at the head end of the ingot is 350°C. The temperature of the ingot from the head end to the tail end shows a gradient downward trend, and the temperature gradient is 30°C. ℃ / m; Put the heated ingot i...

Embodiment 2

[0052] Step 1: Use the semi-continuous casting method to produce large-scale 2-series ingots with all indicators meeting the technical specifications, and perform homogenization annealing. Chemical analysis of the ingot shows that the Si content is 0.042%, the Fe content is 0.053%, the Cu content is 3.79%, the Mg content is 1.34%, the Mn content is 0.49%, the Cr content is 0.0078%, the Ti content is 0.042%, and the Zr content is 0.103% ;

[0053] Step 2: Heat and heat-preserve the mold with a box-type mold heating furnace to ensure that the core of the mold is warm and the mold temperature is heated to 410°C;

[0054] Step 3: The temperature of the extrusion cylinder is set at 420°C. Extrusion can only be carried out after the temperature reaches. The set temperature of the head end of the ingot is 430°C. ℃ / m, put the heated ingot into the extrusion cylinder, put the ingot head side into the left and right double-hole molds, and perform reverse extrusion. The extrusion axis s...

Embodiment 3

[0058] Step 1: Use the semi-continuous casting method to produce large-scale 2-series ingots with all indicators meeting the technical specifications, and perform homogenization annealing. Chemical analysis of the ingot shows that the Si content is 0.045%, the Fe content is 0.049%, the Cu content is 4.09%, the Mg content is 1.38%, the Mn content is 0.64%, the Cr content is 0.0074%, the Ti content is 0.052%, and the Zr content is 0.103% %;

[0059] Step 2: Heat and heat-preserve the mold with a box-type mold heating furnace to ensure that the core of the mold is warm and the mold temperature is heated to 410°C;

[0060] Step 3: Set the temperature of the extrusion barrel to 420°C, set the temperature at the head end of the ingot to 410°C, the temperature of the ingot from the head end to the tail end shows a gradient downward trend, and the temperature gradient is 20°C / m, heat the ingot to the temperature The ingot is loaded into the extrusion cylinder, and the head end of the...

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Abstract

A 2-series aluminum alloy profile for the wing girder of a civil aircraft and its manufacturing method, in the field of aluminum alloy profile manufacturing for civil aircraft, the mass percentage of each substance in the alloy profile is: the Si content is less than 0.05%, and the Fe content is less than 0.06% %, Cu content 3.7%~4.1%, Mg content 1.2%~1.4%, Mn content less than 0.4%~0.8%, Cr content less than 0.02%, Ti content 0.02%~0.06%, Zr content 0.08%~0.12% , the content of other impurity elements is less than 0.15%, and the balance is Al. The invention improves the lateral performance of the profile and reduces the residual stress of the profile by adopting technical means such as the optimization of the die hole layout, the isothermal reverse extrusion of the ingot step heating, and the low stress step quenching. 2-series aluminum alloy profiles are used for the underwing girders.

Description

technical field [0001] The invention belongs to the field of manufacturing aluminum alloy profiles for civil aircraft, and in particular relates to a 2-series aluminum alloy profile for the lower girder of a wing of a civil aircraft and a manufacturing method thereof. Background technique [0002] The level of the aviation manufacturing industry is an important symbol of national strength. Since my country launched the first large-scale civil aircraft development project in 1970, my country's aviation manufacturing industry has made significant progress. Especially in the past ten years, with the development of my country's economy and civil aviation industry With the rapid development, the air transport industry has shown huge market demand. The development of commercial aircraft with independent intellectual property rights has been put on the agenda as one of the national goals. The development projects of ARJ21 new regional aircraft and large passenger aircraft C919 have b...

Claims

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Application Information

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IPC IPC(8): C22C21/16C22C21/14C22F1/057B21C23/20B21D3/12
CPCB21C23/20B21D3/12C22C21/14C22C21/16C22F1/002C22F1/057
Inventor 程仁策赵国群孙有政李红萍陈康华李昌龙杨亚平曹善鹏
Owner SHANDONG NANSHAN ALUMINUM
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