CN-121980119-A - Machining correction method for steam turbine blade steam passage profile surface position deviation

CN121980119ACN 121980119 ACN121980119 ACN 121980119ACN-121980119-A

Abstract

The invention relates to the technical field of turbine blade processing and discloses a processing correction method for the profile position deviation of a turbine blade steam passage, which comprises the following steps of S1, obtaining the number M of blades, setting the serial number j=1 of the blades, S2, and obtaining the height of each section of a jth blade and the actually measured position deviation of each section; S3, substituting the measured position deviation of each section height and each section of the jth blade into a correction value equation set, solving and constructing a correction function, S4, calculating and obtaining a correction quantity alpha j and a correction gradient ratio b j of the jth blade based on the correction function, S5, judging whether j is equal to M, if so, outputting correction quantity alpha j and correction gradient ratio b j of the M blades, if not, assigning j+1 to j, returning to the execution step S2, and S6, carrying out machining correction on the corresponding blade based on the correction quantity alpha j and the correction gradient ratio b j of each blade. The invention can effectively reduce the position deviation of the steam passage molded surface and improve the processing precision of the blade.

Inventors

ZHANG GUANGXING
ZHOU YUNBO
XIAO JIAWEN
LIAO LONG
Yu Chengchuan
TANG KUN
WANG TING
YANG YUTING
LONG FEI
LI CHUNYAN
HOU MINGHUA
LI QIYUAN
YANG DALI
SHI LEI
WANG YONGXIAN
ZHANG YUSHENG
CHENG ZHIFANG
XIONG XIAOCONG
SUN FANGYUAN
DONG QIANG
GUO XIAOHONG

Assignees

东方电气集团东方汽轮机有限公司

Dates

Publication Date: 20260505
Application Date: 20251224

Claims (10)

1. A processing correction method for the position deviation of the steam passage profile of a turbine blade is characterized in that: the processing correction method comprises the following steps: S1, acquiring the number M of blades, and setting a blade serial number j=1; s2, acquiring the height of each section of the jth blade and the actually measured position deviation of each section; S3, substituting the measured position deviation of the height of each section and each section of the jth blade into a correction value equation set, and solving and constructing a correction function; S4, calculating a correction quantity alpha j and a correction gradient ratio b j of the jth blade based on the correction function; s5, judging whether j is equal to M, if so, outputting correction quantity alpha j and correction gradient ratio b j of M blades, if not, assigning j+1 to j, and returning to the step S2; And S6, processing and correcting the corresponding blade based on the correction quantity alpha j and the correction slope ratio b j of each blade.
2. The method for processing and correcting the position deviation of the steam passage profile of a turbine blade according to claim 1, wherein: The specific step of acquiring the height of each section of the jth blade and the actually measured position deviation of each section comprises the following steps: s21, constructing a molded line coordinate system according to a blade theoretical model, and acquiring theoretical section data of each section; s22, measuring and obtaining actual section data and heights of sections of the jth blade by using a three-coordinate measuring machine based on the molded line coordinate system; S23, based on the theoretical section data and the actual section data of each section, analyzing and matching the theoretical section data and the actual section data of each section by using special software for three-coordinate measurement and analysis to obtain the actual measurement position deviation of each section.
3. The method for processing and correcting the position deviation of the steam passage profile of a turbine blade according to claim 2, wherein: the molded line coordinate system uses the blade height direction of the blade theoretical model as a Z axis, the direction of the steam inlet and outlet side as an X axis and the direction of the inner back arc as a Y axis.
4. A method for processing and correcting a positional deviation of a turbine blade duct profile as set forth in claim 3, wherein: the specific steps for acquiring the theoretical section data of each section are as follows: And presetting a plurality of gear values along a Z axis of the molded line coordinate system, and cutting the blade theoretical model along a direction parallel to an XY plane by using each gear value to obtain theoretical section data of each section.
5. The method for processing and correcting the position deviation of the steam passage profile of a turbine blade according to claim 4, wherein: the specific steps of obtaining the actual section data and the actual height of each section of the jth blade based on the linear coordinate system measurement by using a three-coordinate measuring machine are as follows: And (3) aligning the coordinate system of the three-coordinate measuring machine with the molded line coordinate system, cutting the jth blade along the parallel XY plane by using each gear value to obtain actual section data of each section, and taking the gear value as the height of the section.
6. The method for processing and correcting the position deviation of the steam passage profile of a turbine blade according to claim 1, wherein: The correction value equation set is as follows: ; Wherein, the In the number of sections to be taken, Is the measured positional deviation of the kth cross section, Is the height of the kth cross-section, And the number of the blade is the serial number of the blade.
7. The method for processing and correcting the position deviation of the steam passage profile of a turbine blade according to claim 6, wherein: The correction function is: 。
8. the method for processing and correcting the position deviation of the steam passage profile of a turbine blade according to claim 7, wherein: the calculation formula of the correction quantity alpha j of the jth blade is calculated as follows: α j =arctan(A j )。
9. The method for processing and correcting the position deviation of the steam passage profile of a turbine blade according to claim 8, wherein: The calculation formula for calculating the correction slope ratio b j of the jth blade is as follows: b j =A j *100。
10. the method for processing and correcting the position deviation of the steam passage profile of a turbine blade according to claim 1, wherein: The specific steps for processing and correcting the corresponding blade comprise: And determining the correction processing posture of the blade according to the correction inclination ratio b j of the blade, supporting and fixing the blade, obtaining a part to be processed according to the correction quantity alpha j of the blade, and processing the part to be processed.

Description

Machining correction method for steam turbine blade steam passage profile surface position deviation Technical Field The invention relates to the technical field of turbine blade machining, in particular to a machining correction method for the position deviation of a turbine blade steam passage profile. Background The turbine blade processing is made by multiple procedures, wherein five-axis profile processing is a key procedure for forming a steam channel profile, but the steam channel profile obtained after the five-axis profile processing has a certain integral deformation due to the difference of blank heat treatment stress field levels and the difference of allowance, and the deviation of the positions of all sections of the steam channel profile is inconsistent, so that the blade processing precision is low. Disclosure of Invention The invention aims to provide a processing correction method for the steam turbine blade steam passage profile position deviation, which can effectively reduce the steam passage profile position deviation and improve the blade processing precision, aiming at the defects of the prior art. The technical scheme adopted by the invention is as follows: a method for machining and correcting a position deviation of a steam passage profile of a turbine blade, the method comprising the steps of: S1, acquiring the number M of blades, and setting a blade serial number j=1; s2, acquiring the height of each section of the jth blade and the actually measured position deviation of each section; S3, substituting the measured position deviation of the height of each section and each section of the jth blade into a correction value equation set, and solving and constructing a correction function; S4, calculating a correction quantity alpha j and a correction gradient ratio b j of the jth blade based on the correction function; s5, judging whether j is equal to M, if so, outputting correction quantity alpha j and correction gradient ratio b j of M blades, if not, assigning j+1 to j, and returning to the step S2; And S6, processing and correcting the corresponding blade based on the correction quantity alpha j and the correction slope ratio b j of each blade. According to the technical measure, the height and the actually measured position deviation of each section of each blade are calculated and brought into a correction value equation set, and the correction function is solved and constructed, so that the correction quantity and the correction slope ratio of each blade are calculated and obtained based on the correction function, and the corresponding blade is processed and corrected based on the correction quantity and the correction slope ratio of the blade, so that the processing precision can be effectively improved, the position deviation is reduced, and the assembly size is guaranteed to be excellent. Further, the specific step of obtaining the height of each section and the measured position deviation of each section of the jth blade includes: s21, constructing a molded line coordinate system according to a blade theoretical model, and acquiring theoretical section data of each section; s22, measuring and obtaining actual section data and heights of sections of the jth blade by using a three-coordinate measuring machine based on the molded line coordinate system; S23, based on the theoretical section data and the actual section data of each section, analyzing and matching the theoretical section data and the actual section data of each section by using special software for three-coordinate measurement and analysis to obtain the actual measurement position deviation of each section. According to the technical measure, theoretical section data of each section are obtained according to the blade theoretical model, actual section data of each section are obtained by utilizing a three-coordinate measuring machine, matching analysis is carried out on the theoretical section data and the actual section data of each section by utilizing special software for analyzing the three-coordinate measuring machine, actual position deviation of each section is obtained, and the operation is easy. Further, the molded line coordinate system uses the blade height direction of the blade theoretical model as a Z axis, the direction of the steam inlet and outlet side as an X axis and the direction of the inner back arc as a Y axis. Further, the method comprises the steps of, The specific steps for acquiring the theoretical section data of each section are as follows: And presetting a plurality of gear values along a Z axis of the molded line coordinate system, and cutting the blade theoretical model along a direction parallel to an XY plane by using each gear value to obtain theoretical section data of each section. Further, the specific steps of obtaining the actual section data and the height of each section of the jth blade based on the molded line coordinate system measurement by using a three-coordina