Processing method for no-crown guide blade of steam turbine

Abstract

The invention provides a processing method for a no-crown guide blade of a steam turbine, relates to processing methods for blades of steam turbines and aims at solving the problems that the existing processing technology for the no-crown guide blade of the steam turbine is complex and the standards of reference surface processing and steam passage processing are non-uniform. The method provided by the invention comprises the steps of: firstly, ensuring that a workblank is a die casting or a square steel forge; secondly, ensuring that an inner back molded line of a steam passage is processed in a numerical control manner; thirdly, processing an inner arc: placing an inner arc of the blade in a setting angle state, measuring the inner arc, processing a locating surface in a length locating direction and a locating reference surface in a steam outlet side direction used during the processing of an inner arc molded line and a back arc and keeping the locating surface and the locating reference surface being consistent with the inner arc molded line; thirdly, processing the back arc: flatly placing the back arc of the blade on a machine tool surface, measuring the back arc of the blade and processing a back arc molded line; and fourthly, cutting conical surfaces at the two ends of the inner back molded line by utilizing a linear cutting manner after the inner back molded line of the blade is processed, and then completing the processing of the blade. The processing method has the advantages that multiple procedures can be integrated, and the production efficiency is improved while the blade quality is guaranteed.

Description

technical field [0001] The invention relates to a method for processing steam turbine blades. Background technique [0002] Crownless guide vanes are commonly used in steam turbines, and the existing processing methods are: [0003] 1. Determine whether the blank is die casting or square steel forging. [0004] 2. On the ordinary milling machine, the mold casting is positioned with the blade profile line to process the process surface in the length direction or the length reference of the square steel. [0005] 3. On the ordinary milling machine, the mold casting is positioned with the blade profile line to process the technical surface of the steam outlet direction or the side steel side reference. [0006] 4. CNC milling process steam channel profile. [0007] 5. Conical surfaces at both ends of the CNC milling blade. [0008] In the usual processing method, when processing die castings or square steel blades, one is to carry out two milling datum plane processes, and ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for processing the crownless guide vane of the steam turbine in order to solve the problems of complex processing technology of the existing steam turbine crownless guide vane and the inconsistency of datum surface processing and steam passage processing.