Method for repairing fir-shaped mortise working surface scratch defect of wheel disc of gas turbine

Abstract

A method for repairing a fir-shaped mortise working face scratch defect of a wheel disc of a gas turbine comprises the following steps that firstly, the machined mortise scratch condition on the wheel disc is checked, and a mortise with a scratch is marked; 2, indexing of a clamp is adjusted to enable the defective mortise on the wheel disc to directly face a broach box; 3, a jack III, a jack I and a jack II are jacked up in sequence; 4, a finish broaching tool is used for broaching the defective mortise, and the finish broaching tool is retreated after broaching is completed; 5, the scratch removal condition of a working surface is checked after the defective mortise is machined, and if the defect is not completely removed, the step 2 to the step 4 are repeated until the defect is removed; and step 6, the indexing of the clamp is adjusted, and the step 2 to the step 5 are repeated to repair the next defective mortise. The purpose of adjusting and strengthening a broaching structure can be effectively achieved through the jacks and dial indicators in groups; and the precision of the finish broaching tool is utilized to ensure the contour precision and the mutual position precision of the mortise working face in repeated broaching, and the loss caused by overall scrapping of the wheel disc is avoided.

Description

technical field [0001] The invention belongs to the technical field of wheel disk tenon and groove repair, and in particular relates to a method for repairing scratch defects on a fir tree-shaped tenon and groove working surface of a gas turbine wheel disk. Background technique [0002] The fir-tree-shaped tenon-groove structure of the wheel disk workpiece of the gas turbine is complex, and there are multiple sets of working surfaces. The contour accuracy and mutual position accuracy of the working surfaces are extremely demanding, and the material is difficult to process, so it is generally processed by broaching. In the broaching process of the mortise and groove of the roulette, affected by factors such as the elastic deformation of the broach box and the fixture, and the running gap of the broach, the clearance between the semi-finish broach and the finish broach is inconsistent, and the broaching amount of the finish broach is too small , resulting in that the finishing...

AI Technical Summary

Problems solved by technology

In the broaching process of the mortise and groove of the roulette, affected by factors such as the elastic deformation of the broach box and the fixture, and the running gap of the broach, the clearance between the semi-finish broach and the finish broach is inconsistent, and the broaching amount of the finish broach is too small , resulting in the finishing broach not being able to completely cover the pre-sequence broach during processing, and the tenon-groove working surface is prone to scratches

Conventional grinding to remove defects is inefficient, and it is difficult to ensure the contour accuracy and mutual position accuracy of the tenon and groove working surface, which will cause the entire wheel to be scrapped

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