Fine milling method for two-half type thin-wall stationary blade

Abstract

The invention relates to the field of turbine machining, in particular to a two-half type thin-wall stationary blade finish-milling method which comprises the steps that a stationary blade machining blank is obtained; the blade is subjected to layered winding milling through the first cutting depth, and the milling allowance is reserved; carrying out plunge milling on the tail edge of the blade to 0 position; the back arc of the blade is milled; milling the inner arc of the blade layer by layer and bypassing the tail edge; and milling the whole blade. By the adoption of the machining method, the blade allowance of each part of the blade can be uniformized during machining, then the radial cutting force is reduced through plunge milling, the cutting stress borne by a workpiece is small, subsequent machining bypasses the trailing edge and is not machined, then stress borne by the blade can be reduced during layered milling, and blade deformation is reduced; and the cut part can be smooth during finish milling of the back arc, so that the machining quality is improved.

Description

technical field [0001] The invention relates to the field of turbine machining, in particular to a two-half type thin-wall stator vane fine milling method. Background technique [0002] The stator blade is an extremely important part of the rotor part of the air turbine. When the rotor part is in operation, the stator blade bears a large working stress and a high working temperature, and the stress and temperature change frequently and violently. The requirements are very strict, so the processing accuracy of the stator blades is very high. [0003] The static blades of this model are two halves, the blades are straight blades, and the trailing edge of the blades is thinner. After the rough milling, the stator blade is divided into two halves by "wire cutting". Two blades of the stator blade must be divided, and one of them cannot avoid being divided near the trailing edge. The blade is a straight grain blade, and the fine milling stage is the blade forming milling, using ...

AI Technical Summary

Problems solved by technology

The fine milling of the static blade uses tooling and clamping, and the two halves of the static blade are combined for overall processing. The trailing edge of the blade whose trailing edge is divided has low strength. Using the existing overall milling method (the leading edge, trailing edge and blade are milled together) will Deformation occurs, the thinner the segmented part, the more serious the deformation

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