Correcting method for residual deformation of magnesium alloy thin flat plate casting

Abstract

The invention relates to a correcting method for residual deformation of a magnesium alloy thin flat plate casting. To overcome the defect of residual deformation of the magnesium alloy thin flat plate casting, correction is carried out through a method of combination of a correction clamp and an infrared tunnel kiln, the magnesium alloy thin flat plate casting is installed in the correction clamp and placed in the infrared tunnel kiln, preheat, constant-temperature treatment and cooling aging treatment are carried out, the residual deformation of the magnesium alloy thin flat plate casting is corrected, residual stress is eliminated, and stability and reliability of the shape of the magnesium alloy thin flat plate casting are effectively improved. After correction, the planeness error of the magnesium alloy thin flat plate casting is smaller than or equal to 0.05 mm, and the residual deformation of the magnesium alloy thin flat plate casting is effectively eliminated. The correcting method is advanced in technology, data are accurate and full, the correction clamp is advanced and reliable, the structure is compact, precision is high, and the correcting method is a very advanced correcting method for residual deformation of the magnesium alloy thin flat plate casting.

Description

technical field [0001] The invention relates to a method for rectifying the residual deformation of a magnesium alloy thin flat casting, which belongs to the technical field of magnesium alloy sheet casting processing. Background technique [0002] Magnesium alloy thin plate castings are widely used in electronic products as shell-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 magnesium 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, which causes residual stress to form inside the casting. When the residual stress exceeds the yield s...

AI Technical Summary

Problems solved by technology

[0003] When forming, during the solidification and cooling process of magnesium 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, which causes residual stress to form inside the casting. When the residual stress exceeds the yield strength of the material, residual deformation will occur; residual deformation will make Magnesium alloy thin flat castings change the original design size, lose the original precision, and also affect the appearance of the product, especially in mass production, castings with residual deformation will form waste products during machining

[0004] At present, the residual deformation of magnesium 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 castings to be scrapped; some mechanical corrections are also used to put the castings 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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