A method for manufacturing a 7-series aluminum alloy profile for the upper girder of a civil aircraft wing

Abstract

A 7-series aluminum alloy profile for the upper girder of a civil aircraft wing and a manufacturing method thereof, belonging to the field of manufacturing aluminum alloy profiles for civil aircraft, the mass percentages of each substance in the alloy profile are: Cu content 2.1%-2.4%, Mg content 2.0%-2.2%, Zn content 7.8%-8.2%, Ti content 0.02%-0.06%, Zr content 0.08%-0.12%, Fe content less than 0.10%, Mn content less than 0.05%, Cr content less than 0.02% , the content of other impurities is less than 0.15%, and the balance is Al. The present invention improves the lateral performance of the profile, reduces the residual stress of the profile, and produces a product that meets the requirements of the domestic civil aircraft wing by adopting technical means such as die hole layout optimization, isothermal reverse extrusion of ingot step heating, and low-stress step quenching. Truss uses the required profiles.

Description

technical field

[0001] The invention belongs to the field of manufacturing aluminum alloy profiles for civil aircraft, and in particular relates to a method for manufacturing 7-series aluminum alloy profiles for girders on wings of civil aircraft. 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 been launched successi...

Examples

Embodiment 1

[0044] Step 1: Use semi-continuous casting to produce large-scale 7-series ingots with all indicators meeting the technical specifications, and perform homogenization annealing. Chemical analysis of the ingot revealed that the Si content was 0.04%, the Fe content was 0.08%, the Cu content was 2.24%, the Mg content was 2.0%, the Mn content was 0.01%, the Cr content was 0.0072%, the Zn content was 8.05%, and the Ti content was 0.045%. , Zr content 0.103%;

[0045] 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;

[0046] Step 3: The set temperature of the extrusion barrel is 400°C, and the extrusion can only be carried out after the temperature reaches. ℃ / 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 speed of reverse extrusion is 0.5mm / s , ...

Embodiment 2

[0050] Step 1: Use semi-continuous casting to produce large-scale 7-series ingots with all indicators meeting the technical specifications, and perform homogenization annealing. Chemical analysis of the ingot shows that the Si content is 0.05%, the Fe content is 0.09%, the Cu content is 2.38%, the Mg content is 2.1%, the Mn content is 0.01%, the Cr content is 0.0092%, the Zn content is 8.14%, and the Ti content is 0.032%. , Zr content 0.113%;

[0051] 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;

[0052] Step 3: The temperature of the extrusion barrel is set at 420°C, and the extrusion can only be carried out after the temperature reaches the temperature. ℃ / 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 speed of reverse extrusion is 0.1...

Embodiment 3

[0056] Step 1: Use semi-continuous casting to produce large-scale 7-series ingots with all indicators meeting the technical specifications, and perform homogenization annealing. Chemical analysis of the ingot shows that the Si content is 0.05%, the Fe content is 0.09%, the Cu content is 2.38%, the Mg content is 2.1%, the Mn content is 0.01%, the Cr content is 0.0092%, the Zn content is 8.14%, and the Ti content is 0.032%. , Zr content 0.113%;

[0057] 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;

[0058]Step 3: Set the temperature of the extrusion barrel to 420°C, set the temperature at the head end of the ingot to 430°C, and 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. The ingot is loaded into the extrusion cylinder, and the head end of the ingot is loaded into the l...

technical field

[0001] The invention belongs to the field of manufacturing aluminum alloy profiles for civil aircraft, and in particular relates to a method for manufacturing 7-series aluminum alloy profiles for girders on wings of civil aircraft. 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 been launched successi...

Examples

Embodiment 1

[0044] Step 1: Use semi-continuous casting to produce large-scale 7-series ingots with all indicators meeting the technical specifications, and perform homogenization annealing. Chemical analysis of the ingot revealed that the Si content was 0.04%, the Fe content was 0.08%, the Cu content was 2.24%, the Mg content was 2.0%, the Mn content was 0.01%, the Cr content was 0.0072%, the Zn content was 8.05%, and the Ti content was 0.045%. , Zr content 0.103%;

[0045] 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;

[0046] Step 3: The set temperature of the extrusion barrel is 400°C, and the extrusion can only be carried out after the temperature reaches. ℃ / 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 speed of reverse extrusion is 0.5mm / s , ...

Embodiment 2

[0050] Step 1: Use semi-continuous casting to produce large-scale 7-series ingots with all indicators meeting the technical specifications, and perform homogenization annealing. Chemical analysis of the ingot shows that the Si content is 0.05%, the Fe content is 0.09%, the Cu content is 2.38%, the Mg content is 2.1%, the Mn content is 0.01%, the Cr content is 0.0092%, the Zn content is 8.14%, and the Ti content is 0.032%. , Zr content 0.113%;

[0051] 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;

[0052] Step 3: The temperature of the extrusion barrel is set at 420°C, and the extrusion can only be carried out after the temperature reaches the temperature. ℃ / 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 speed of reverse extrusion is 0.1...

Embodiment 3

[0056] Step 1: Use semi-continuous casting to produce large-scale 7-series ingots with all indicators meeting the technical specifications, and perform homogenization annealing. Chemical analysis of the ingot shows that the Si content is 0.05%, the Fe content is 0.09%, the Cu content is 2.38%, the Mg content is 2.1%, the Mn content is 0.01%, the Cr content is 0.0092%, the Zn content is 8.14%, and the Ti content is 0.032%. , Zr content 0.113%;

[0057] 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;

[0058]Step 3: Set the temperature of the extrusion barrel to 420°C, set the temperature at the head end of the ingot to 430°C, and 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. The ingot is loaded into the extrusion cylinder, and the head end of the ingot is loaded into the l...

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