A Method for Eliminating Residual Stress of Aluminum Alloy Aviation Forging Cylinder

Abstract

A method for eliminating residual stress of an aluminum alloy aviation forging cylinder, comprising the following steps: Step 1: performing solid solution treatment and quenching heat treatment on the forging cylinder that has been forged. During the quenching process, a circumferential support frame is installed inside the forging cylinder to prevent large deformation of the long forging cylinder. Step 2: According to the diameter, wall thickness, and material properties of the forging after quenching, determine the amount of deformation to be applied to cold bulging, and design the corresponding cold bulging punch and lower cutting board according to the calculated deformation of cold bulging; Step 3 : Put the cold-expandable punch into the forging cylinder, press down the cold-expandable punch at a pressing speed of 2mm / s until the cold-expandable punch reaches the bottom of the forging cylinder, turn the forging cylinder upside down, and use the same The lower pressing speed makes the cold-expandable punch reach the bottom of the forging cylinder again. The invention can obtain good residual stress reduction effect, uniform deformation of each part of the forging, and high surface quality.

Description

technical field [0001] The invention belongs to the field of eliminating the residual stress of an aviation forging cylinder, in particular to a method for eliminating the residual stress of an aluminum alloy aviation forging cylinder. Background technique [0002] Aluminum alloy materials have been widely used in aviation and aerospace vehicles due to their low density, high specific strength, and good corrosion resistance. However, in the process of hot forming and heat treatment of aluminum alloy aerospace products, large residual stress is often generated inside the forging due to uneven deformation or different cooling rates of materials at different thicknesses during quenching. The existing residual stress will produce many adverse consequences, such as deformation, warping, and twisting of the forgings in the subsequent machining process. Whole batches of forgings are scrapped, especially important aluminum alloy structural forgings for aviation. If the internal res...

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Problems solved by technology

[0003] Common residual stress relief methods for aluminum alloy die forgings include die cold pressing method, die drawing method, cryogenic method, shot peening method, mechanical vibration, pressure-holding aging method, etc., but these methods are suitable for flat die forgings and are difficult to apply Residual Stress Relief for Larger Size Forged Cylinders

How to eliminate the residual stress inside the aluminum alloy aerospace forging cylinder, there is still no corresponding technology for actual production

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