Method for eliminating residual stress of aluminum alloy aviation forge cylinder

Abstract

The invention discloses a method for eliminating residual stress of an aluminum alloy aviation forge cylinder. The method comprises the following steps that step 1, solution treatment and quenching heat treatment are carried out on the forged and formed forge cylinder, and in the quenching process, a circumferential supporting frame is arranged at the interior of the forge cylinder to prevent therelatively-large deformation of the long forge cylinder; step 2, according to the diameter, the wall thickness and the material performance of a quenched forge piece, the deformation amount of cold bulging is determined, and a corresponding cold bulging punch and lower cutting board are designed according to the calculated deformation amount of cold bulging; and step 3, the cold bulging punch is placed in the forge cylinder, the cold bulging punch is pressed downwards at the pressing speed of 2 mm / s till the cold bulging punch reaches the bottom end of the forge cylinder, the forge cylinder isturned over up and down, and the cold bulging punch is pressed to reach the bottom end of the forge cylinder again at the same pressing speed. According to the method, a good residual stress eliminating effect can be achieved, all parts of the forge piece uniformly deform, and the surface quality is high.

Description

Technical field [0001] The invention belongs to the field of eliminating residual stress of aerospace forging cylinders, in particular to a method for eliminating residual stress of aluminum alloy aerospace forging cylinders. Background technique [0002] Because of its low density, high specific strength, and good corrosion resistance, aluminum alloy materials have been widely used in aviation and aerospace vehicles. However, during the hot forming and heat treatment of aluminum alloy aerospace products, due to uneven deformation or different cooling rates of materials at different thicknesses during the quenching process, large residual stresses are generated inside the forgings. This kind of residual stress will produce many undesirable consequences. It is easy to cause deformation, warping, and twisting of the forgings in the subsequent machining process, and the size of the processed structural parts is out of tolerance, making the parts unable to be assembled to the designa...

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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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