A Method for Reducing Quenching Residual Stress of Die Forgings

Abstract

The invention discloses a method for reducing the quenching residual stress of die forgings, which relates to the technical field of aluminum alloy material processing, specifically including S1, cryogenic treatment of forgings; S2, slow heating and S3, low-temperature furnace return, the method for reducing quenching residuals of die forgings Stress method, the forging is rotated above the liquid nitrogen to generate a cyclone, which can accelerate the suction of cold air close to the surface of the forging, thereby speeding up the cooling speed of the forging, shortening the original cryogenic treatment time of 1 to 3 hours to 0.5 to 1.5 hours, and the cooled forging Put it in room temperature water and heat it slowly, slowly eliminate residual stress and avoid embrittlement of forgings due to rapid thermal expansion and contraction, and the forgings can be heated after stirring in room temperature water, and the time required for the forgings heated by room temperature water to return to the furnace will also be reduced Shortened, thereby shortening the time required for residual stress relief, and improving the processing efficiency of forgings.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy material processing, in particular to a method for reducing the quenching residual stress of die forgings. Background technique [0002] 7050 aluminum alloy has good comprehensive properties such as high strength, high toughness, and corrosion resistance. It is a commonly used metal material in the aviation field. The alloy needs to be solid-liquid treated at a high temperature of about 470 ° C, and artificially aged after quenching. In order to obtain excellent comprehensive performance, but in the process of quenching and cooling, the large temperature difference between the surface of the forging and the inside of the forging will cause compressive stress on the surface of the forging, while tensile stress will be generated inside the forging, and eventually the subsequent processing of the forging will easily cause deformation of the part and the finished product of the part The service...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a method for reducing the quenching residual stress of die forgings, which solves the problem that the existing cryogenic treatment method for forgings proposed in the above-mentioned background technology needs to change the forgings from extremely cold to extremely hot quickly, and Due to rapid thermal expansion and cold contraction, the forging surface is extremely prone to embrittlement, which makes the forging prone to cracking in the later processing process.