Correction processing method of fixture wheel groove profile for static-frequency detection

Abstract

The invention provides a correction processing method of a fixture wheel groove profile for static-frequency detection and can solve problems that scratches and drawing marks are produced easily due to small gaps between blade root profiles and wheel groove profile non-working surfaces and high dead weight of blades in processes that the blades are mounted in wheel groove blocks and then move at present. The method comprises steps of finish milling processing and correction processing which are conducted sequentially; in the finish milling step, a blade root wheel groove profile is processed by the aid of a finish milling molding knife according to a designed blade root wheel groove profile; in the correction processing step, finish milling processing is performed once again in the position with the correction height h lifted overall on the basis of the blade root wheel groove profile by the aid of the finish milling molding knife used in finish milling processing, only an inside back working surface of a blade root wheel groove is processed in correction processing, and a non-working surface of the blade root wheel groove is not cut, so that a non-working surface profile, obtained through finish milling processing, of the blade root wheel groove and an inside back working surface profile, obtained through correction processing, of the blade root wheel groove are connected to form a correction profile of the blade root wheel groove, and the correction height h ranges from 0.2 mm to 1.0 mm.

Description

technical field [0001] The invention relates to the technical field of blade static frequency detection, in particular to the field of blade static frequency detection fixture tooling, in particular to a method for correcting and processing the wheel groove profile of a static frequency detection fixture. Background technique [0002] The groove block for frequency measurement is usually processed according to the groove profile drawing provided by the user. The assembly gap between the blade and the working surface and the non-working surface of the groove is usually very small, and the minimum gap can reach 0.03mm. When the blade is inserted into the wheel After the groove block, under the self-weight of the blade itself, the non-working surface of the blade usually moves relative to the non-working surface of the wheel groove block for frequency measurement. If the blade is heavy, it is easy to cause scratches between the two. scratches, pull marks and other appearance de...

AI Technical Summary

Problems solved by technology

[0002] The groove block for frequency measurement is usually processed according to the groove profile drawing provided by the user. The assembly gap between the blade and the working surface and the non-working surface of the groove is usually very small, and the minimum gap can reach 0.03mm. When the blade is inserted into the wheel After the groove block, under the self-weight of the blade itself, the non-working surface of the blade usually moves relative to the non-working surface of the wheel groove block for frequency measurement. If the blade is heavy, it is easy to cause scratches between the two. scratches, pull marks and other appearance defects; once the wheel groove block for frequency measurement has scratches, it will aggravate the occurrence of scratches on the non-working surface of the blade for subsequent frequency detection. serious

[0003] Using the traditional method to process the wheel groove profile for frequency measurement, when the wheel groove profile is finely milled, because the cutting edge of the forming knife has a long expansion length, it is easy to cause the surface finish of the machined wheel groove working surface to not reach Ra =1.6 requirement, and the waviness of the visually processed surface is very poor, so that when the blade frequency is measured, under the action of a strong clamping force, the working surface of the blade will be indented; at the same time, such a processing mode is difficult to guarantee The pitch size between the working faces is required to be controlled at such a high requirement as 0.01~0.02. The internal back arc is prone to misaligned teeth, which affects the accuracy of the frequency measurement data of the blade and the stability of the frequency measurement state, and eventually leads to the frequency measurement of the wheel groove block. scrapped

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