A method for sheet aging of aluminum alloy aviation thin plate

Abstract

This invention proposes a plate-type aging production method for thin aluminum alloy aerospace plates. By directly shearing the finished product after solution quenching and aging, the problem of excessively thin aerospace plates failing to meet shearing requirements after aging is avoided. Simultaneously, the plates are stacked in a plate-type aging furnace, and a cover plate is added to the aluminum square tube above the plates. High-temperature resistant tape is used to fix the thermocouple hot junctions, preventing the hot air inside the aging furnace from moving the plates and causing the thermocouples to vibrate. This solves the problem that the thinness and insufficient weight of aerospace plates affect the normal temperature acquisition by the thermocouples. Therefore, aluminum alloy plates with a finished thickness of less than 4mm can be aged in a plate-type aging furnace.

Description

Technical Field

[0001] This invention belongs to the field of aerospace aluminum alloy processing and production, and particularly relates to a method for aging production of thin aluminum alloy aerospace plates. Background Technology

[0002] Research on aerospace thin plates in my country is still in its early stages, resulting in limited equipment and resources for their production. For aging, coil-type aging furnaces are commonly used; however, these furnaces suffer from low versatility and high purchase costs. Furthermore, the thinness, light weight, and high surface finish of aerospace thin plates make it difficult to achieve the same technical results as coil-type furnaces using common plate aging furnaces. In addition, general saws cannot meet the sawing requirements of aerospace thin plates, failing to guarantee successful sawing and resulting in off-center cuts and waste. Moreover, due to the thinness and light weight of aerospace thin plates, thermocouples cannot be used to monitor plate temperature during aging, as their movement under the influence of hot air in the furnace affects temperature measurement. Therefore, a method is needed to create conditions for using plate aging furnaces for the aging process of aerospace thin plates, laying a solid foundation for their production. Summary of the Invention

[0003] This invention addresses the problem that existing aluminum alloy aerospace thin plates, due to their thinness, insufficient weight, and high surface requirements, must be aged using a coil-type aging furnace. It proposes a plate-type aging production method for aluminum alloy aerospace thin plates, using a plate-type aging furnace to age the aerospace thin plates.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for aging aluminum alloy aerospace thin plates includes the following steps:

[0006] Solution quenching treatment: The finished product is placed in a heating furnace and heated and held at that temperature; after the holding time is completed, it is transferred to a roller hearth furnace for quenching treatment, and then cooled to room temperature to obtain the solution quenched finished product;

[0007] Cross-cutting process: Before the cross-cutting process, the solution-quenched finished product is aged in a plate aging furnace to obtain a large sample; then the large sample is sawn into plates.

[0008] Sheet stacking: Overhead cranes are used to stack and pile up the sheets, with multiple sheets stacked into one pile and multiple small piles stacked into one stack; this improves production efficiency.

[0009] Sheet fabrication: Fabrication of thermocouples is carried out simultaneously with stacking of materials. The positions of the thermocouples are calculated in advance, and the thermocouples are arranged between small stacks. High-temperature resistant tape is used to fix the hot junction of the thermocouples.

[0010] Covering the sheet metal: A layer of aluminum square tube is placed on top of the sheet metal stack, and a cover plate is placed on top of the aluminum square tube; this prevents the hot air in the furnace from blowing the sheet metal during aging; the aluminum square tube mainly serves as a partition, and ventilation can be provided in the middle to facilitate uniform heating of the sheet metal during heat treatment.

[0011] Solution-quenched finished product stacking: Stack the solution-quenched finished products together; cover them with a cover plate and place them at the head or tail of the stack;

[0012] Aging treatment: Aging treatment is performed on the board material;

[0013] Performance testing and packaging / shipping: The boards undergo performance testing after aging treatment, and those that pass the test are packaged and shipped.

[0014] Preferably, in the solution quenching process, the solution treatment temperature is 460℃~500℃ and the solution treatment holding time is 30min~60min.

[0015] Preferably, the aging treatment of the solution-quenched finished product in the cross-cutting process and the aging treatment of the plate in the aging process are carried out in the same aging furnace; the solution-quenched finished product is then used in the next process flow after aging treatment.

[0016] As a preferred method, during the stacking process, the height of each stack of boards is controlled between 30mm and 50mm; high-temperature resistant felt and aluminum square tubes are used to separate the stacks to ensure that each stack of boards is heated evenly during heating; in order to ensure that each board is heated evenly, the height of the stack should not be too high.

[0017] Preferably, in the matting process, the matting depth is >300mm.

[0018] As a preferred option, in the aging process, the aging temperature is controlled at 118℃~125℃, and the holding time is 18h~24h.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0020] 1. This invention overcomes the technical difficulties of thin plate aging process by using a more common plate aging furnace for aging heat treatment, avoids the coil aging method, increases the heating uniformity of the plate, makes the plate performance more stable, and reduces the performance deviation between different positions, bringing more economic and social benefits to enterprises.

[0021] 2. This invention directly shears the finished product after solution quenching and aging treatment, avoiding the problem that the thin aerospace plates cannot meet the shearing requirements after aging due to their thinness. At the same time, the plates are stacked in a plate aging furnace, and a cover plate is added to the aluminum square tube above the plates. The thermocouple hot junction is fixed with high-temperature resistant tape, so that the hot air in the aging furnace cannot blow the plates and the thermocouples will not shake. This solves the problem that the thinness and insufficient weight of aerospace plates will affect the normal temperature acquisition of the thermocouples.

[0022] 3. The present invention provides a method for aging production of aluminum alloy aerospace thin plates, which enables aluminum alloy plates with a finished thickness of less than 4mm to undergo aging treatment in a plate aging furnace. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of sheet metal being stacked in an aging furnace;

[0025] Figure 2 A schematic diagram of thermocouple installation on a sheet metal plate.

[0026] Figure 3 Mechanical testing report (page 1);

[0027] Figure 4 For mechanical testing report (page 2). Detailed Implementation

[0028] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0029] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0030] Example 1, such as Figures 1-4 As shown, a method for producing aluminum alloy aerospace thin plates by aging includes the following specific steps:

[0031] Solution quenching treatment: The aluminum alloy finished product is subjected to solution treatment at a temperature of 480℃ and a holding time of 60min. After the holding time is completed, the aluminum alloy finished product is quenched in water at room temperature. After the aluminum alloy finished product is cooled to room temperature, the solution quenched finished product is obtained.

[0032] Cross-cutting process: Before the cross-cutting process, the solution-quenched finished product is aged in a plate aging furnace at a temperature of 120℃ for 22 hours; after the aging process, a large sample is obtained; the large sample is sawn into plates.

[0033] Sheet material stacking: such as Figure 1 As shown, overhead cranes are used to stack the boards. Multiple boards are stacked into one stack. To ensure that each board is heated evenly, the stack height should not be too high. The height of the stack should be controlled between 30mm and 50mm. Multiple small stacks are stacked into one pile. To improve production efficiency, high-temperature resistant felt and aluminum square tubes are used to separate the stacks.

[0034] Board dolls: such as Figure 2 As shown, thermocouples are placed simultaneously with the stacking of materials. The positions of the thermocouples are calculated in advance, and the thermocouples are arranged between the small stacks with a depth greater than 300mm. High-temperature resistant tape is used to fix the hot end of the thermocouples to the plate.

[0035] Covering the sheet metal: Add another layer of aluminum square tubes on the sheet metal stack and cover the aluminum square tubes with a cover plate; to prevent the hot air in the furnace from blowing the sheet metal during aging.

[0036] Solution-quenched finished product stacking: Stack the solution-quenched finished products for the next process together; cover them with a cover plate and place them at the head or tail of the stack;

[0037] Aging treatment: The finished product after solution quenching and the plate are aging treated together in the aging furnace for the next process. The aging treatment temperature is 125℃ and the aging treatment time is 20h.

[0038] Performance testing: such as Figure 3 , Figure 4 As shown, eight aging-treated boards were selected, with sample numbers 2HT1, 2HT2, 2HT3, 2HT4, 2BT1, 2BT2, 2BT3, and 2BT4. Performance tests were conducted on these eight aging-treated boards, and the results of their mechanical property tests are shown in Table 1.

[0039] Table 1. Test results of mechanical properties of aging-aged sheet materials

[0040]

[0041] The mechanical properties of the aluminum alloy sheet produced by plate aging in Example 1 meet the AMS-4049 standard.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for aging aluminum alloy thin plates for aerospace applications, characterized in that, Includes the following steps: Solution quenching treatment: The finished product is placed in a heating furnace and heated and held at that temperature; after the holding time is completed, it is transferred to a roller hearth furnace for quenching treatment, and then cooled to room temperature to obtain the solution quenched finished product; Cross-cutting process: Before the cross-cutting process, the solution-quenched finished product is aged in a plate aging furnace to obtain a large sample; then the large sample is sawn into plates. Board stacking: Use overhead cranes to stack the boards, stacking multiple boards into one stack, and stacking multiple small stacks into one pile; Sheet fabrication: Fabrication is carried out simultaneously with stacking materials. The positions of the fabrication are calculated in advance, and the thermocouples are arranged between the small stacks. Use high-temperature resistant tape to secure the thermocouple hot junction. Covering the sheet material: Cover the sheet material stack with a layer of aluminum square tube, and then cover the aluminum square tube with a cover plate. Solution-quenched finished product stacking: Stack the solution-quenched finished products for the next process together; cover them with a cover plate and place them at the head or tail of the stack of plates; Aging treatment: The finished product after solution quenching and the plate are aged together in the aging furnace for the next process. Performance testing and packaging / shipping: The boards after aging treatment are subjected to performance testing, and the boards that pass the test are packaged and shipped. In the solution quenching process, the solution treatment temperature is 460℃~500℃, and the solution treatment holding time is 30min~60min. The aging treatment of the solution-quenched finished product in the cross-cutting process and the aging treatment of the plate in the aging process are carried out together in the same aging furnace. During the board stacking process, the height of a stack of boards is controlled between 30mm and 50mm; high-temperature resistant felt and aluminum square tubes are used to separate the stacks. In the board-making process, the doll depth is greater than 300mm; In the aging process, the aging temperature in both the cross-cutting process and the aging process is controlled at 118℃~125℃, and the holding time is 18h~24h.

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