A Compensation Method for Shot Peening Elongation of Large Aluminum Alloy Parts

Abstract

The invention discloses a compensation method for the extension amount of shot blasting strengthening of a large aluminum alloy part. A part is divided into multiple areas in the length direction; multiple length values A with different thicknesses are formed; a test block with the material the same with that of the part is manufactured; the effective depth H and the effective diameter D of a shotpit formed by each blast shot are calculated according to the surface roughness Rz obtained before test block shot blasting and the surface roughness Rz obtained after test block shot blasting; the extension amount delta length of each thickness area is calculated; the extension amount of each thickness area is accumulated to the extension amount of the whole part; the theoretical digital analogof the part is subjected to scaling to form the technological digital analog according to the above part extension amount; and numerical control machining and shot blasting strengthening of the part are conducted according to the technological digital analog.

Description

technical field [0001] The application belongs to aircraft manufacturing technology, and further relates to the shot peening of parts, in particular to a compensation method for shot peening elongation of large aluminum alloy parts. Background technique [0002] After shot peening of large aluminum alloy parts over 5 meters, such as beams, girders, and wall panels of the aircraft, due to the accumulation of craters, they will be stretched and deformed, resulting in an increase in the size of the parts, which will adversely affect the subsequent assembly of parts. [0003] At present, the main solution to this problem in China is to measure the dimensional changes of the parts before and after shot peening, and analyze the data after continuously accumulating multiple racks of data to obtain the shot peening elongation of the part, and then according to the elongation The process digital model is formed by scaling the digital model of the part, and finally the method of numer...

AI Technical Summary

Problems solved by technology

This method has a long cycle and high cost, and will produce many out-of-tolerance parts, which not only affects the assembly progress of the aircraft, but also affects the product quality of the aircraft

[0004] At the same time, since the temperature of the factory buildings of domestic enterprises cannot be kept constant, large temperature changes will occur. The measurement data is greatly affected by the thermal expansion and contraction of the parts themselves, and the dispersion of the data is very large.

It is difficult to obtain a very accurate extension value through data analysis, and the accuracy of digital-analog correction and compensation of parts is poor. Generally, only 50% to 60% of the extension amount is used for digital-analog scaling of parts.

[0005] In addition, since the amount of shot peening elongation of a part is related to its own structure and shot peening process, once the theoretical model of the part or the shot peening process undergoes a major change, the amount of shot peening elongation will change greatly. The digital and analog corrections made must be restarted, resulting in major iterations of part quality

Images