Method for reducing residual stress of high-slenderness-ratio arc-shaped fillet opened aluminum alloy forge pieces

Abstract

The invention discloses a method capable of avoiding buckling of forge pieces in the length direction and reducing residual stress of high-slenderness-ratio arc-shaped fillet opened aluminum alloy forge pieces. A cold compressing die is adopted for implementing the method and the method comprises the steps that A, the forge pieces are subjected to cold compression within four hours after solid solution heat treatment; B, the forge pieces are put into the cold compressing die; C, a steel plate is longitudinally arranged in the position, corresponding to a fillet, of the non-fillet face, and then cold compression deformation is conducted; D, a new steel plate is placed on each of the two sides of the part subjected to cold compression, the overlap amount of the steel plate and the indentation of former cold compression is 30%-50%, and then cold compression deformation is conducted again; E, the step D is repeated until cold compression deformation of all zones of the non-fillet face is completed; F, finally, the middle of the non-fillet face is subjected to cold compression again; and G, overall cold compression is conducted again after segmented cold compression is completed and the overall cold compression is controlled by tonnage. By adopting the method, the uniformity of the appearance of the forge pieces can be ensured and the evenness of the cold compression deformation amount of the forge pieces is improved.

Description

technical field [0001] The invention belongs to the field of material science and engineering, in particular to a method of reducing the net projected area by 4m through segmental cold compression. 2 A method for the residual stress of the above-mentioned aluminum alloy large slenderness ratio curved rib opening type forgings. Background technique [0002] It is known that aluminum alloy has the advantages of low density, high specific strength, good fatigue strength and stress corrosion resistance, etc., and plays a very important role in the development of the national economy. Aluminum alloy forgings are a very important form of aluminum alloy products. Aluminum alloy forgings have the advantages of uniform structure and good mechanical properties, and are mainly used in particularly important load-bearing structural components in the fields of aerospace, transportation, ships, energy and power, and petrochemicals. Many production processes of forgings will generate res...

AI Technical Summary

Problems solved by technology

At present, the largest press capacity in the world is 800MN, so the residual stress of the alloy cannot be reduced by the overall cold compression method. According to the equipment situation, the residual stress of the forging can only be reduced by segmented cold compression.

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