Forging method for improving qualified rate of large-wall-thickness 5754 aluminum alloy forged piece

Abstract

The invention discloses a forging method for improving the qualified rate of a large-wall-thickness 5754 aluminum alloy forged piece, and belongs to the technical field of aluminum alloy forging. According to the technical scheme, the forging method is characterized by comprising the following steps that S1, a blank is blanked; S2, forging and heating are conducted on the blank; S3, the heated blank is forged to obtain a ring blank; S4, annealing is conducted; S5, machining is conducted; and S6, inspection is conducted. The method has the advantages that the cast ingot applies appropriate plastic deformation, the microstructure is improved, grains are refined, the situation that micro-cracks are formed in the middle of the wall thickness due to non-uniform stress is avoided, and the qualification rate of workpieces is increased.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy forging, in particular to a forging method for improving the qualified rate of 5754 aluminum alloy forgings with large wall thickness. Background technique [0002] 5754 aluminum alloy is a typical 5-series aluminum-magnesium alloy with medium strength, weldability, and good corrosion resistance. Generally, it is mainly made of rolled plates and less extruded profiles. It can be widely used in automobiles, Transportation, aerospace and other fields. When producing large-scale 5754 aluminum alloy rings with a feeding weight of more than 1800kg for forgings (wall thickness B≥400, height ≤300), the ratio of the wall thickness to the height of the workpiece before ring rolling is ≥1.5, and there are more holes after reaming and ring rolling. Problems that affect the passing rate of the product for one-time inspection [0003] At present, in the process of reaming the blank with a wall thickne...

AI Technical Summary

Problems solved by technology

When producing large-scale 5754 aluminum alloy rings with a feeding weight of more than 1800kg for forgings (wall thickness B≥400, height ≤300), the ratio of the wall thickness to the height of the workpiece before ring rolling is ≥1.5, and there are more holes after reaming and ring rolling. Problems that affect the passing rate of the product for one-time inspection

[0003] At present, in the process of expanding the blank with a wall thickness ≥ 600mm to a wall thickness of 400-480mm, the force is uneven at the 1 / 2 wall thickness position, causing intergranular dislocations and the extension of the original small cracks, forming linear cracks.

As a result, the flaw detection of the workpiece after forging found that there are dense point-like or linear defects in the entire circle at this position, and the performance of the workpiece is also unevenly distributed.

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