Creep aging forming regulation and control method

Abstract

The invention provides a creep aging forming regulation and control method. The method comprises the steps that before an aluminum alloy plate blank is cut, multiple samples are cut on the blank, and the included angles between the length directions of the samples and the rolling direction of the aluminum alloy plate blank are different; the multiple samples are clamped in a creep testing machine; and the creep test is conducted on each sample, the creep amount of each sample is measured in real time, and the length direction of the sample which is largest in creep amount and highest in creep speed serves as the main forming direction of an aluminum alloy plate. According to the creep aging forming regulation and control method, the creep performance of the aluminum alloy plate blank in all directions is tested in the creep testing machine, the optimal forming direction of the aluminum alloy plate blank is determined, then the aluminum alloy plate blank is cut and fed, and therefore the forming limit of the aluminum alloy plate can be improved, the aluminum alloy plate can achieve the high curvature at the high speed, then the load or the time or the temperature required by the purpose of achieving the target forming curvature can be reduced or shortened, and the success rate and the efficiency of the creep forming are improved.

Description

technical field [0001] The invention relates to creep aging forming technology, in particular to a creep aging forming control method. Background technique [0002] Creep aging forming technology is a new type of forming technology that ingeniously combines the creep behavior of metals with aging strengthening behavior. Creep aging forming technology utilizes metal materials under the joint action of artificial aging temperature and elastic stress for a period of time. The creep deformation can obtain a component with a certain shape, which has many advantages such as small damage, high forming accuracy, small residual stress, and good repeatability. With the continuous progress of our country's industry, our country's aerospace technology has developed rapidly, and the creep aging forming technology has continuously improved, and has become an indispensable large-scale panel forming technology in the field of aerospace product manufacturing. In the process of creep aging f...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the methods to increase the forming capacity of materials mainly include increasing the creep aging time, increasing the creep aging temperature, increasing the loading load and changing the pre-deformation. Too long time or too high temperature will cause the test The strength of the piece is weakened, which affects the service performance. Increasing the load will cause a greater probability of buckling or folding (a phenomenon of instability), which will cause the forming to fail. Increasing the pre-deformation will cause the elongation of the test piece to decrease, which will affect the subsequent welding process. poses challenges, therefore, these methods have their own limitations

At present, high-strength aviation aluminum alloy is mostly used as the material of large-scale wall panels such as wing panels and rocket storage tanks. In the creep forming process, the aluminum alloy panels are first placed on the forming mold and then transferred to the autoclave for use. The creep aging forming process is processed into curved surface components (such as melon petal-shaped curved surfaces for splicing into hemispherical surfaces, arc-shaped surfaces for splicing into cylindrical surfaces), and then several pieces of curved surface components are welded into a whole large component ( Such as hemispherical or cylindrical components), aluminum alloy sheets are mostly processed by rolling process. At present, the way of placing aluminum alloy sheets on the forming die is to keep the length direction of aluminum alloy sheets and the rolling direction of aluminum alloy sheets. Coincidentally, since the rolling direction is not necessarily the direction that is most likely to creep, this arrangement is not the most favorable for the creep deformation of the aluminum alloy sheet, that is, the forming limit of the aluminum alloy sheet is not large enough, which means It will cause a whole large component to be split into multiple small surface components, or require a long forming process time

The smaller the forming limit, the more the number of splits required or the longer the required forming processing time, and the current aircraft, rockets and other aerospace products are developing in the direction of large tonnage and large volume, which will make the Under the same forming limit conditions, the larger the size of a single whole, the more small surface components need to be disassembled, which will increase the difficulty of manufacturing, reduce production efficiency, and be detrimental to product quality. Therefore, the existing A solution is needed in technology to solve this problem

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