Method for shape correction of high-temperature alloy thin-wall aeroengine casing part through electric arc heating

Abstract

The invention provides a method for shape correction of a high-temperature alloy thin-wall aeroengine casing part through electric arc heating, and belongs to the technical field of welding. The method comprises the first step of carrying out size measurement before shape correction, selecting the outer ends of all supporting tubes as measurement points and then carrying out marking, and measuring the jump values of all measurement points on an inner ring; the second step of determining the sequence of shape correction, carrying out heating shape correction on the minimum jump value point firstly and then carrying out heating shape correction on two points adjacent to the minimum jump value point, and carrying out shape correction in priority on the point, with the smaller jump value, of the two points; the third step of carrying out electric arc heating shape correction, and carrying out electric arc heating on reinforcing ribs on the two sides of each measurement point sequentially according to the sequence of shape correction; the fourth step of carrying out accurate measurement after shape correction, measuring the jump values of all the measurement points of the inner ring to obtain a radial jump value, and executing the fifth step if the radial jump value meets the design requirement, otherwise, executing the second step; and the fifth step of carrying out stress relief heat treatment, measuring the jump values of all the measurement points on the inner ring after heat treatment to obtain a radial jump value, and ending shape correction if the radial jump value meets the design requirement, otherwise, executing the second step.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a method for correcting the shape of high-temperature alloy thin-wall casing parts by arc heating. Background technique [0002] The high-temperature alloy thin-wall casing part is a welded structural assembly composed of an inner ring, a polygonal outer casing, and eight supporting tubes connecting the inner ring and the outer casing. The structure of the casing is complex and the number of welds is large, and its multi-weld structure will inevitably have a large welding stress during manufacture. At the same time, when it is working normally, there will be a cold air flow passing through the outer casing, and a hot air flow passing through the support tube, which causes the outer casing to shrink under the action of the cold air flow, creating pressure on the support tube; and the support tube has a hot air flow Through the heat expansion of the support tube itself, the outer...

AI Technical Summary

Problems solved by technology

Therefore, the superposition of compressive stress during work and welding compressive stress of the manufacturing structure will cause the casing to bear even greater stress, forcing it to produce excessive deformation with a greater probability

[0003] Based on the above reasons, the casing often has different degrees of out-of-tolerance situations, and it is currently impossible to restore the size through mechanical processing methods

The usual calibration method is to use a muffle furnace for heat treatment calibration, supplemented by special thermal expansion tooling for overall calibration; but this method is complicated in process and long in calibration cycle, and special tooling needs to be designed, and The effect is not obvious; the number of times of heat treatment is limited at the same time, resulting in some casings that cannot be corrected and have to be scrapped

While seriously restricting the production of this part and the matching of finished products, it also causes huge waste of resources and economic losses

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