Correction method of residual deformation of thin flat-plate aluminium alloy casting

Abstract

The invention relates to a correction method of residual deformation of a thin flat-plate aluminium alloy casting. In order to overcome the defect of residual deformation of the thin flat-plate aluminium alloy casting, correction is performed with a correction fixture and far-infrared tunnel furnace combined method, the thin flat-plate aluminium alloy casting is mounted in a correction fixture, placed in a far-infrared tunnel furnace and subjected to preheating, constant-temperature treatment and cooling aging treatment, residual deformation of the thin flat-plate aluminium alloy casting is corrected, residual stress is eliminated, and the stability and the reliability of the shape of the thin flat-plate aluminium alloy casting are effectively improved; the planeness error of the thin flat-plate aluminium alloy casting after correction is equal to or smaller than 0.1 mm, residual deformation of the thin flat-plate aluminium alloy casting is effectively eliminated, the technology of the correction method is advanced, data is accurate and detailed, the correction fixture is advanced and reliable, the structure is compact, the accuracy is high, and the correction method of residual deformation of the thin flat-plate aluminium alloy casting is very advanced.

Description

technical field [0001] The invention relates to a method for correcting residual deformation of aluminum alloy thin plate castings, which belongs to the technical field of aluminum alloy plate casting and forming. Background technique [0002] Aluminum alloy thin plate castings are widely used in electronic products as plate-shaped structural parts, such as notebook computers, tablet computers, digital cameras, digital cameras, LED displays, and mobile phone parts. [0003] When forming, during the solidification and cooling process of the aluminum alloy thin flat casting, due to the different temperature and cooling rate of each part, the shrinkage of the casting at the same time is different, and each part of the casting is an interconnected whole, which leads to mutual Stress is generated due to constraints; when the casting is demoulded and cooled to room temperature, thermal stress is generated due to the resistance of linear shrinkage, resulting in residual stress insi...

AI Technical Summary

Problems solved by technology

[0003] When forming, during the solidification and cooling process of aluminum alloy thin flat castings, due to the different temperatures and cooling rates of various parts, the shrinkage of the castings at the same time is different. Stress is generated due to constraints; when the casting is demoulded and cooled to room temperature, thermal stress is generated due to the resistance of linear shrinkage, resulting in residual stress inside the casting. When the residual stress exceeds the yield strength of the material, residual deformation will occur. Thermal stress is the cause The main factor of residual deformation of castings; residual deformation will change the original design size of aluminum alloy thin plate castings, lose the original precision, and also affect the appearance of the product, especially in mass production, castings with residual deformation will be mechanically processed form waste

[0004] At present, the residual deformation of aluminum alloy thin flat castings is mostly corrected by hand, which is labor-intensive, low in production efficiency, and the correction force is not easy to control, which may easily cause the casting to be scrapped; some use mechanical correction to put the casting into a heated mold. Relying on the mold to apply anti-deformation to the casting to eliminate residual deformation, this method can only correct the deformation of four sides, and the correction effect on bending deformation, wave deformation, and twisting deformation is not good, and the production efficiency is low; the residual deformation is corrected manually and mechanically. It is only mandatory to temporarily eliminate the residual deformation. There is still residual stress inside the casting. After the casting is placed for a period of time or in the subsequent processing process, the residual deformation will gradually rebound.

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