CN-116793219-B - Method for rapidly measuring forward and reverse splicing of integrally closed leaf ring

CN116793219BCN 116793219 BCN116793219 BCN 116793219BCN-116793219-B

Abstract

The invention relates to the technical field of measurement and analysis of leaf profiles of aerospace integrally closed leaf rings, and particularly discloses a method for quickly measuring forward and backward splicing of integrally closed leaf rings, which comprises the steps of obtaining a closed leaf ring to be measured, and establishing a forward part coordinate system; measuring the positions of all standard balls on the closed blade ring to be measured relative to a normal part coordinate system and the positions of all standard balls on the closed blade ring to be measured relative to a machine tool coordinate system in a current normal installation posture, acquiring front face point cloud data of the blade to be measured in the normal installation part coordinate system, reversely installing the closed blade ring to be measured, measuring the positions of all standard balls relative to the machine tool coordinate system in a current reverse installation posture, calculating to obtain a reverse installation part coordinate system, acquiring reverse face point cloud data of the blade to be measured in the reverse installation part coordinate system, and splicing and integrating the point cloud data in the forward and reverse installation postures to form complete profile point cloud data of the closed blade ring to be measured. The invention solves the problems of more detection blind areas and low detection efficiency of the large-scale closed leaf ring by carrying out clamping measurement on the front side and the back side twice.

Inventors

CUI GUANGYU
XU WEIFEI
DI ZHONG
DAI XING
PU DONGLIN

Assignees

江苏集萃华科智能装备科技有限公司
华中科技大学无锡研究院

Dates

Publication Date: 20260508
Application Date: 20230625

Claims (8)

1. The method for quickly measuring the forward and backward splicing of the integrally closed leaf ring is characterized by comprising the following steps of: S1, acquiring a closed leaf ring to be detected, uniformly connecting 3 standard balls on the closed leaf ring to be detected, introducing a CAD model corresponding to the closed leaf ring to be detected, and calling a measuring needle on measuring equipment to establish a positive part coordinate system identical to the CAD model; S2, measuring the position of each standard ball on the closed blade ring to be measured relative to the coordinate system of the normal part and the position of each standard ball relative to the coordinate system of the machine tool under the current normal installation posture; s3, selecting a blade profile to be measured on the closed blade ring to be measured, dividing a front measuring area and a back measuring area of the blade profile to be measured, respectively planning measuring paths in the measuring areas of the measuring needle in the front clamping posture, and calling the planned front measuring paths to obtain front point cloud data of the blade to be measured in the front clamping posture in a front part coordinate system; s4, turning the closed blade ring to be tested for 180 degrees for reverse installation, and measuring the positions of all standard balls on the closed blade ring to be tested relative to the machine tool coordinate system under the current reverse installation posture; Step S5, calculating a reverse-loading part coordinate system according to the positions of the 3 standard balls relative to the forward-loading part coordinate system in the forward-loading posture obtained in the step S2, the positions of the 3 standard balls relative to the machine tool coordinate system in the reverse-loading posture obtained in the step S4; s6, calling a planned reverse measurement path under a reverse part coordinate system to acquire reverse point cloud data of the blade to be tested under the reverse mounting posture; step S7, splicing and integrating all the surface point cloud data of the blade to be detected, which are acquired in the front clamping gesture and the back clamping gesture, so as to form the complete surface point cloud data of the closed blade ring to be detected; Wherein, in the step S5, the method further includes: according to the positions of the 3 standard balls relative to the coordinate system of the normal part in the normal loading posture obtained in the step S2, the positions of the 3 standard balls relative to the coordinate system of the machine tool in the reverse loading posture obtained in the step S4, obtaining a theoretical coordinate system of the part in the reverse loading posture, namely a coordinate system of the reverse loading part, through matrix calculation; Wherein, the theoretical part coordinate system under the reverse installation posture is obtained through matrix calculation, and the method further comprises the following steps: a spherical coordinate system is established by the positions of the spherical centers of 3 standard balls, the spherical center of the ball 1 is taken as an origin, and For the X axis to × For the Z axis to × For the Y-axis, thereby determining the spherical coordinate system; Wherein, the For a vector representation of the line connecting the centers of sphere 1 and sphere 2, A vector representation of the line connecting the sphere centers of the sphere 1 and the sphere 3; The closed leaf ring to be measured exists when being positively installed: · = ; the closed leaf ring to be tested exists when reversely installed: · = ; because 3 standard balls are fixedly connected with the closed leaf ring body to be tested, the relative position relation is fixed, so that the closed leaf ring has the following structure: = ; thus, there are: · = · ; so there are: = · ·( ); wherein, mcs represents a machine tool coordinate system, wcs + represents a forward component coordinate system, wcs-represents a reverse component coordinate system, o+ represents a forward ball coordinate system, and o-represents a reverse ball coordinate system.
2. The method for rapid measurement of forward and reverse splicing of integrally closed bling according to claim 1, wherein in step S1, further comprising: And importing the leaf ring CAD model in the IGS/STP/Sab format into measurement software Modus, and establishing a coordinate system of the closed leaf ring forward-installed part to be detected, which is the same as the CAD model, according to reference characteristics of points, lines and surfaces marked on a process or measurement drawing by combining a right-hand method.
3. The method for rapid measurement of forward and reverse splicing of integrally closed bling according to claim 1, wherein in step S2, further comprising: And under the current forward installation posture, the position of each standard ball on the closed blade ring to be detected relative to the coordinate system of the forward installation part and the position of each standard ball relative to the coordinate system of the machine tool are measured through triggering sampling points or planning path scanning.
4. The method for rapid measurement of forward and reverse splicing of integrally closed bling according to claim 1, wherein in step S3, further comprising: According to the structure of the closed blade ring to be measured and the curvature change of the blade to be measured, the surface of the blade to be measured is divided into a plurality of measuring areas, under the forward clamping gesture and the reverse clamping gesture, the angle of a measuring head, the approaching/retreating distance, the scanning angle range and the overlapping amount of adjacent paths are adjusted, the interference-free measuring path in each measuring area is calculated, and the interference-free measuring path is optimized and checked for collision, so that all the measuring areas which are the shortest in the overall measuring path and are divided can be completely scanned and covered under the forward clamping gesture and the reverse clamping gesture.
5. The method for rapid measurement of forward and reverse splicing of integrally closed bling according to claim 1, wherein in step S4, further comprising: And under the current reverse installation posture, the positions of all the standard balls on the closed leaf ring to be detected relative to the coordinate system of the machine tool are measured by triggering sampling points or planning path scanning.
6. The method for rapid measurement of forward and reverse splicing of integrally closed bling according to claim 1, wherein in step S6, the method comprises: And selecting a proper measuring needle, setting a safety distance, calling a planned non-interference back surface measuring path, scanning and measuring a back surface measuring area of the blade to be measured in a back-loading posture, and obtaining profile point cloud data in the back surface measuring area of the blade to be measured.
7. The method for rapid measurement of forward and reverse splicing of integrally closed bling according to claim 1, wherein in step S7, the method comprises: And under the front clamping attitude and the back clamping attitude, carrying out cyclic scanning measurement through a DMIS language cyclic instruction to obtain front and back surface point cloud data of each blade to be tested, and then carrying out one-to-one splicing complementary integration on the obtained front and back surface point cloud data of each blade to be tested under the front part coordinate system or the back part coordinate system through the DMIS language instruction to form complete profile point cloud data of the closed blade ring to be tested.
8. The method for rapidly measuring the forward and reverse splicing of the integrally closed bling according to claim 7, further comprising: Under the two clamping postures of forward and reverse installation, variable definition naming and assignment are respectively carried out on the characteristics of each measuring area of the scanning, cyclic scanning measurement is carried out on each measuring area of the blade to be measured through a DMIS language cyclic instruction, so that point cloud data of each measuring area of each blade to be measured are stored in a database, and the acquired front and reverse surface point cloud data are spliced and complementarily integrated one by one through the DMIS language instruction to form complete profile point cloud data of the closed blade ring to be measured.

Description

Method for rapidly measuring forward and reverse splicing of integrally closed leaf ring Technical Field The invention relates to the technical field of measurement and analysis of leaf profiles of aerospace integrally closed leaf rings, in particular to a method for quickly measuring forward and backward splicing of integrally closed leaf rings. Background The integral closed blade ring is large in general overall size, complex in structure, high in blade number, low in detection efficiency and high in labor cost, the two ends of the blades are hubs and wheel covers, the blades are in a closed area, the gaps between the blades are narrow, interference is easy to occur during measurement, the measuring blind areas are large, three-coordinate conventional blade profile detection methods are mainly used for detecting and analyzing profile data acquired at one time under a horizontally or vertically placed gesture, interference is easy to occur during measurement, interference-free measurement areas are limited, the blade profile data are incomplete, parts are vertically placed and measured, the number of the blades is large, the blade ring gesture needs to be disassembled and assembled for many times, the detection efficiency is low, the labor cost is high, and a new detection method needs to be created for solving the current measurement bottleneck. As shown in FIG. 1, the diameter of the whole blade ring is about 1.5m, 126 blades are uniformly distributed in the circumferential direction, the inner and outer annular structures are much higher than the blades in the blade width direction, the angle of the measuring needle is limited, the complex structure interferes with the measuring needle under one clamping, and the measuring needle in a partial area is not reachable (as shown in the frame of FIG. 1), so that a measuring blind area is formed, and the detection and analysis of the blade profile cannot be performed. Disclosure of Invention The invention aims to overcome the defects in the prior art and provides a method for quickly measuring forward and backward splicing of an integral closed type blade ring, so as to solve the problems of more closed type blade ring detection blind areas and low detection efficiency in the prior art. As a first aspect of the invention, a method for rapidly measuring the forward and reverse splicing of an integrally closed leaf ring is provided, which comprises the following steps: S1, acquiring a closed leaf ring to be detected, uniformly connecting 3 standard balls on the closed leaf ring to be detected, introducing a CAD model corresponding to the closed leaf ring to be detected, and calling a measuring needle on measuring equipment to establish a positive part coordinate system identical to the CAD model; S2, measuring the position of each standard ball on the closed blade ring to be measured relative to the coordinate system of the normal part and the position of each standard ball relative to the coordinate system of the machine tool under the current normal installation posture; s3, selecting a blade profile to be measured on the closed blade ring to be measured, dividing a front measuring area and a back measuring area of the blade profile to be measured, respectively planning measuring paths in the measuring areas of the measuring needle in the front clamping posture, and calling the planned front measuring paths to obtain front point cloud data of the blade to be measured in the front clamping posture in a front part coordinate system; s4, turning the closed blade ring to be tested for 180 degrees for reverse installation, and measuring the positions of all standard balls on the closed blade ring to be tested relative to the machine tool coordinate system under the current reverse installation posture; Step S5, calculating a reverse-loading part coordinate system according to the positions of the 3 standard balls relative to the forward-loading part coordinate system in the forward-loading posture obtained in the step S2, the positions of the 3 standard balls relative to the machine tool coordinate system in the reverse-loading posture obtained in the step S4; s6, calling a planned reverse measurement path under a reverse part coordinate system to acquire reverse point cloud data of the blade to be tested under the reverse mounting posture; and S7, splicing and integrating all the surface point cloud data of the blade to be detected, which are acquired under the front clamping gesture and the back clamping gesture, so as to form the complete surface point cloud data of the closed blade ring to be detected. Further, in the step S1, the method further includes: And importing the leaf ring CAD model in the IGS/STP/Sab format into measurement software Modus, and establishing a coordinate system of the closed leaf ring forward-installed part to be detected, which is the same as the CAD model, according to reference characteristics of points, lines and surfaces marked o