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Hot stamping and superplastic gas-bulging combined forming process

A technology of superplastic forming and hot stamping, which is applied in transportation, packaging, and vehicle parts, etc., can solve the problems of delay in the weight reduction of aluminum alloy automobile bodies, inability to quench near-thirst in distant water, etc., to avoid cracking and Large springback, reduced material cost, less process effect

Inactive Publication Date: 2010-07-28
ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that although this method is theoretically effective, it does not quench thirst in the distant water.
Due to the constraints of material and process costs, the work of reducing the weight of aluminum alloy automobile bodies has been unable to enter the middle and low-end automobiles with large-scale characteristics.

Method used

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  • Hot stamping and superplastic gas-bulging combined forming process
  • Hot stamping and superplastic gas-bulging combined forming process
  • Hot stamping and superplastic gas-bulging combined forming process

Examples

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Embodiment Construction

[0023] From a commercial 5000 series aluminum alloy sheet, an automotive front fender was formed. The specific working steps are as follows:

[0024] 1) Obtain high-temperature stress-strain data and elongation data and forming limit diagrams of specific aluminum alloy sheets at different temperatures and different strain rates.

[0025] 2) Preliminary mold cavity surface design and process parameters (forming temperature, bulging gas pressure time curve) design are carried out according to the shape and size of the part to be formed.

[0026] 3) Apply numerical simulation technology to optimize the surface of the mold cavity to minimize the local strain, and optimize as much as possible to allow the maximum strain to appear in unimportant parts.

[0027] 4) Apply numerical simulation technology to optimize the forming temperature and pressure time curves to obtain the lowest cost and fastest forming speed, and accordingly select the appropriate grade of aluminum alloy sheet....

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Abstract

The invention provides a new process of quick superplastic forming of automotive body parts of aluminum alloy automobiles, which is mainly characterized in that hot stamping is combined with superplastic gas-bulging forming, so that the advantages of the hot stamping and the superplastic gas-bulging forming are relatively complemented to achieve the aim of quick superplastic forming. The process reduces the requirements of the conventional superplastic forming on grain sizes of sheet materials, and allows for the use of ordinary commercial aluminum alloy sheet materials. Compared with a cold stamping process, the new process has the advantages of overcoming the drawbacks of cracks and large springback, along with fewer working procedures and high yield; and compared with the conventional superplastic forming process, the new process improves the forming speed obviously, and reduces the material cost. The new process eliminates the technical barriers in making light weight automobile bodies of the low and medium-grade automobiles by using aluminum alloy, and is an efficient and high-quality process for the mass production of the automobile bodies of the aluminum alloy automobiles.

Description

[0001] Technical field The present invention relates to a plastic forming process of large aluminum alloy body parts Background technique [0002] Using aluminum alloy sheet instead of steel plate to manufacture automobile body is one of the important measures to reduce automobile weight and reduce fuel consumption. In the prior art, conventional cold stamping processes are mostly used for the forming of aluminum alloy automobile body parts. The disadvantages of low plasticity and low elastic modulus of aluminum alloy at room temperature make the cold stamping process yield of aluminum alloy automobile body parts low. The main defect is the out-of-tolerance part size caused by forming cracking and springback. For this reason, the superplastic inflation forming process of aluminum alloy automobile body parts has been developed in recent years. The superplastic forming process requires that the aluminum alloy sheet must be equiaxed and fine-grained. At present, only the 5083 al...

Claims

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Application Information

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IPC IPC(8): B21D53/88B21D22/02B21D26/02
Inventor 金泉林
Owner ADVANCED MFG TECH CENT CHINA ACAD OF MASCH SCI & TECH
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