Quick creep aging forming (CAF) method

A technology of creep aging forming and creep aging, applied in the direction of forming tools, manufacturing tools, metal processing equipment, etc., can solve the problems that the forming temperature cannot be simply increased, the forming efficiency is accelerated, and the efficiency is not high, so as to achieve easy control and application Wide range of useful effects

Active Publication Date: 2017-06-20
CENT SOUTH UNIV
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  • Application Information

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Problems solved by technology

[0008] The creep process can be divided into three stages, the first stage of creep, the second stage of creep and the third stage of creep, such as figure 2 As shown, the creep rate in the first stage of creep is faster, but gradually decreases with time, while the traditional creep aging forming process mainly uses the creep amount in the second stage of creep for forming, so the efficiency is not high
[0009] From the performance point of view, during the creep aging process, the higher the temperature, the faster the performance improvement, but the lower the peak value, such as image 3 As shown, therefore, the forming temperature cannot be simply raised to speed up the forming efficiency

Method used

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  • Quick creep aging forming (CAF) method

Examples

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Embodiment 1

[0047] see Figure 4 , a method for rapid creep age forming, specifically comprising the following steps:

[0048] The first step, the component and the mold in the autoclave are tightly bonded under load, specifically: apply mechanical force to the component to make the component and the mold fit tightly, and then move the component and mold to the hot press under load or put the component and the mold in a vacuum bag first and then vacuumize, then send the component and the mold into the autoclave, and finally pressurize to make the component close to the mold;

[0049] The second step is to increase the internal temperature of the autoclave to 10°C-50°C above the creep aging temperature T, and keep it warm for 1 hour, and the heating rate during this process is 3°C-5°C / min;

[0050] The third step is to reduce the internal temperature of the autoclave to the creep aging temperature T, and keep it warm for t2 hours, where t2 is 3-4 times of t1, and the cooling rate during t...

Embodiment 2

[0054] In this embodiment, taking 2219 aluminum alloy as an example, the specific method of creep aging forming is disclosed. The details are as follows: specifically, the following steps are included:

[0055] The first step, the component and the mold in the autoclave are closely bonded under the load, specifically: firstly attach the component and the mold to a vacuum bag and then vacuumize, then send the component and the mold together into the autoclave, and finally add Press to make the component close to the mold;

[0056] The second step is to raise the internal temperature of the autoclave to 200°C (the creep aging temperature of 2219 aluminum alloy is 165°C), and keep it warm for 60 minutes. During this process, the heating rate is 3°C-5°C / min;

[0057] Step 3: Lower the temperature inside the autoclave to the creep aging temperature of 165°C. For the holding time, see Figure 5-Figure 7 , the cooling rate during this process is 3°C-5°C / min;

[0058] The fourth ste...

Embodiment 3-4

[0062] Embodiment 3-4 differs from embodiment 2 only in that:

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Abstract

The invention provides a quick creep aging forming (CAF) method. The method comprises the steps as follows: Step 1, a component and a mold in an autoclave are closely attached to each other under the effect of a load; Step 2, the inside temperature of the autoclave is increased to be 10-50 DEG C higher than the creep aging temperature T and is kept for t1 hours; Step 3, the inside temperature of the autoclave is reduced to the creep aging temperature T and is kept for t2 hours, and the t2 is 3-4 times the t1; Step 4, the temperature is reduced to the room temperature, and a product after CAF is obtained after unloading; and the load in Step 1, the load in Step 2 and the load in Step 3 are identical. With the technical scheme, the method has the effects as follows: through combination of short-time temperature keeping after temperature increase to the temperature higher than the creep aging temperature and long-time temperature keeping after temperature reduction to the creep aging temperature, the forming rate can be substantially increased, and the creep product having performance better than that in an existing technology can also be obtained.

Description

technical field [0001] The invention relates to the technical field of creep aging forming, in particular to a method for rapid creep aging forming. Background technique [0002] Creep aging forming (CAF) is based on the principle of stress relaxation. The formed component is subjected to aging heat treatment while creep forming with a special mold. The stress on the formed sample is usually in the elastic range. This forming process is suitable for forming Large complex double-curvature panels with low curvature and low plastic strain, such as aircraft wing panels. This method is based on the creep / stress relaxation characteristics of metal materials, artificial aging treatment is performed, and the shape and excellent comprehensive performance of the complex component of the workpiece are obtained at the same time. CAF is a process that integrates forming and forming. It has high forming efficiency and good performance of parts materials. Compared with traditional cold fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D31/00B21D37/16C22F1/04
CPCB21D31/005B21D37/16C22F1/04
Inventor 湛利华马子尧徐凌志
Owner CENT SOUTH UNIV
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