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Method for precisely controlling stretching of 2196 aluminum lithium alloy profile for civil aircraft supporting structure

A technology of support structure and aluminum-lithium alloy, which is applied in the field of profile drawing and can solve problems such as different degrees of profile drawing and differences in basic mechanical properties.

Pending Publication Date: 2022-04-01
SOUTHWEST ALUMINUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Paulsen et al. found that even if the material is the same, the tensile degree of the profile is different, and the basic mechanical properties are quite different.

Method used

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  • Method for precisely controlling stretching of 2196 aluminum lithium alloy profile for civil aircraft supporting structure
  • Method for precisely controlling stretching of 2196 aluminum lithium alloy profile for civil aircraft supporting structure
  • Method for precisely controlling stretching of 2196 aluminum lithium alloy profile for civil aircraft supporting structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1.1 Stretching work

[0022] 1.1.1 After the product is quenched, it should be stretched and straightened immediately, and the stretching should be completed within 3 hours.

[0023] 1.1.2 Use iron wire scissors to cut off the iron wire worn by the quenching preparation of the end of the product and the bundled material at the end for separation.

[0024] 1.1.3 Start the PLC control cabinet and set the stretching parameters. The stretching speed is set at 10mm / s, the stretching rate is set at 2.8%, and the stretching rate (KPP) is controlled within 2% to 3.5% during stretching.

[0025] 1.1.4 Start the stretching machine to control the power supply, main pump, auxiliary pump and laser range finder.

[0026] 1.1.5 Check the surface and operating conditions of the stretching jaws, then turn the selection switch to the stretching button, and perform an empty pull test on the stretching equipment to check whether the equipment is running smoothly.

[0027] 1.1.6 Accordin...

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Abstract

The invention provides a method for precisely controlling stretching of a 2196 aluminum lithium alloy profile for a civil aircraft supporting structure, which comprises the following steps of: fixing the end of the quenched 2196 aluminum lithium alloy profile within a specified time, and setting stretching parameters; stretching cushion blocks are placed at stretching chucks at the two ends of the profile, a stretching jaw is locked, stretching is started, automatic control is started after a product is straightened through visual inspection, and the process is finished after the set value of the stretching rate is reached. And when the automatic control button is started, the pressure displayed by a main cylinder pressure gauge of the stretcher is visually inspected, and after all the follow-up profiles are executed to reach the pressure, the button for automatically controlling the stretch rate is started. According to the method, stretching of the profile can be accurately controlled. And a technical support is provided for realizing batch production in the future.

Description

technical field [0001] The invention belongs to the technical field of profile stretching, and in particular relates to a method for precisely controlling stretching of 2196 aluminum-lithium alloy profiles used in civil aircraft support structures. Background technique [0002] After years of development, the third generation of foreign aluminum-lithium alloys has formed a relatively complete product lineage, forming a series of materials such as thin plates, profiles and thick plates, such as aluminum-lithium alloy thick plates including 2197, 2297, 2397, 2050 and other series of alloys, thin plates Including 2195, 2198, 2060 and other series of alloys, and profiles include 2099, 2196, 2055 and other series of alloys. At present, these materials are very mature and have formed corresponding AMS standards. [0003] Among the above-mentioned third-generation aluminum-lithium alloys, the upper limit of lithium content in the 2196 alloy is the highest (2.1%). Compared with oth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/30B21D37/00
Inventor 王燕冉林果李晓风同梅梅李烨
Owner SOUTHWEST ALUMINUM GRP