CN111366097A - Aviation blade tenon laser scanning measuring machine and measuring method - Google Patents
Aviation blade tenon laser scanning measuring machine and measuring method Download PDFInfo
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- CN111366097A CN111366097A CN202010179642.8A CN202010179642A CN111366097A CN 111366097 A CN111366097 A CN 111366097A CN 202010179642 A CN202010179642 A CN 202010179642A CN 111366097 A CN111366097 A CN 111366097A
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
Abstract
The invention discloses a laser scanning measuring machine and a laser scanning measuring method for an aviation blade tenon, belongs to the technical field of laser detection, and relates to a laser scanning measuring machine and a laser scanning measuring method for an aviation blade tenon. The measuring machine consists of a fixed bridge type measuring platform, a sensor part and a tenon tool clamp part. The measuring method comprises the steps of firstly calibrating three sensors, and installing tenons to be measured to enable the tenons to be linearly arranged. And adjusting and keeping the pose of the sensor unchanged, and driving the tenon to be detected to linearly move by the linear motor to finish the line laser single scanning. And then secondary scanning is carried out or the linear motor workbench is directly moved reversely to return to the initial position, the obtained point cloud data are coordinated, a three-dimensional model with a measuring tenon is generated, and feature extraction and product qualification evaluation are carried out. According to the invention, the fixed bridge type measuring platform is adopted to carry three line laser sensors, so that the times of disassembling and posture adjustment of the sensors are reduced, and the repeatability and accuracy of measurement are improved; the position of the sensor is adjustable, and the measurement adaptability is improved.
Description
Technical Field
The invention belongs to the technical field of laser detection, and relates to an aviation blade tenon laser scanning measuring machine and a measuring method.
Background
The aviation blade is a core part of an aeroengine, and particularly, the installation quality of the blade is seriously influenced by the processing precision of a tenon, so that the integral performance and the safe service life of the engine are influenced. Blade tenon detection is an important link, and high-precision and high-efficiency measurement is required. At present, the measurement for the blade tenon in China is mostly carried out by combining a projection method with manual measurement of a special measuring instrument. The mode is compared with a standard sample piece through projection, and the concentric circular arc and the tenon tooth position are measured manually so as to ensure the measurement precision of the tenon. However, this method has some problems: firstly, special projection equipment is needed; secondly, a plurality of sets of measuring instruments are needed, a large number of workers are equipped, the measuring efficiency is low, and the measuring consistency is poor; thirdly, the degree of automation of measurement is low, and the detection rhythm is not matched with the production rhythm; fourthly, a measuring workshop needs to be converted, and mechanical damage can be caused in the workpiece conveying process.
The line laser detection method based on the triangular reflection type measurement principle has high sensitivity to displacement change, and can easily scan and measure the outer contour of a part. Compared with a mode combining a projection method and manual measurement, the line laser scanning measurement has the advantages of high measurement efficiency, high precision and easiness in realization of automatic measurement, and is gradually applied to the field of part outer contour detection in recent years. In the prior application, the line laser scanning measurement is more suitable for scanning detection of a single gentle surface. Along with the densification of laser sampling points and the precision of photosensitive elements, the line laser can scan a complex profile with obvious curvature change, and a feasible scheme selection is provided for scanning a complete tenon profile and realizing the efficient and precise measurement of the blade tenon.
In 2014, dawning et al disclosed a rapid positioning and detecting mechanism for tenon of rotor blade in patent CN201420644433.6, the inclination angle of the positioning surface of the device is the same as the inclination angle of the lateral end surface of the tenon after positioning, and then the length of the tenon is detected by using a dial indicator, but the device is only applied to manual measurement of the length of the tenon; in 2018, Hou Feilong and the like in patent CN 201810541949.0, the invention discloses a device for measuring the straightness of a dovetail-shaped tenon of an aero-engine blade, which ensures that the tenon is horizontally placed in a clamp through a locking mechanism of an inclined positioning plate and a base and is detected through a push meter, but the measuring device can only be applied to the detection of the straightness of the tenon and has low measuring precision.
Disclosure of Invention
The invention mainly solves the technical problem of overcoming the defects of the existing method, and provides a laser scanning measuring machine and a measuring method for an aviation blade tenon aiming at the requirement of high-efficiency and precise measurement of the aviation blade tenon. In the invention, a fixed bridge type measuring platform is innovatively designed, a line laser sensor is respectively carried at the left and right upright posts and the cross beam, a linear motor for driving an automatic tool clamp is arranged on a measuring table surface between the two upright posts, the automatic tool clamp can clamp a plurality of tenons to be measured at one time, and the tenons are driven by the linear motor at the bottom of the clamp to do 'bridge-penetrating' type linear movement. The sensor on the left and right stand columns can be driven by the stand column linear motor to move along the stand columns so as to meet the detection requirements of tenons of different specifications. After the sensor is calibrated, the pose is unchanged, in the process of linear movement of the tenon, the three laser planes respectively scan the contours of the left side surface and the right side surface of the tenon and the contour of the bottom surface of the tenon, and the obtained point cloud data are fused under the same coordinate through coordinate conversion; linear scanning under the fixed incident posture of the line laser sensor is achieved, a plurality of complete blade tenon three-dimensional profiles are obtained, and the laser automatic scanning and measuring function of the aviation blade tenon is achieved.
The technical scheme adopted by the invention is that the laser scanning measuring machine for the tenon of the aviation blade is characterized in that the measuring machine consists of a fixed bridge type measuring platform, a sensor part and a tenon tool clamp part;
the fixed bridge type measuring platform consists of a marble measuring table 1, left and right upright posts 2 and 2' and a cross beam 9. A platform counter bore 1a, a groove and a platform motor mounting hole are processed on the side surface of the marble measurement platform 1; threaded holes are processed at the bottoms of the left and right upright posts 2', 2, upright post motor mounting holes are formed in the front surface, and beam mounting tenons and tenon threaded holes are formed in the top. The beam 9 is provided with a beam hole 9a, a T-shaped plate mounting hole and a mounting tongue-and-groove at the bottom. Firstly, the left and right upright posts 2 ', 2 are respectively arranged in the grooves on the surface of the marble measuring table 1, the upright post fixing screws are screwed into the platform countersunk holes 1a and are matched with the threaded holes at the bottoms of the left and right upright posts 2 ', 2, and the left and right upright posts 2 ', 2 are fixed. And finally, matching the beam mounting tenon with the mounting tenon groove at the bottom of the beam, and screwing the beam fixing screw into the beam hole 9a and penetrating into the tenon threaded hole to complete the construction of the fixed bridge type measuring platform.
The sensor part is divided into a left and right column line laser sensor part and a beam line laser sensor part, and the left and right column line laser sensor parts in the left and right column line laser sensor parts have the same structure; fixing an L-shaped connecting plate 4 on an upright post linear motor workbench 5 by using an L-shaped connecting plate bolt, mounting a linear motor 8 with grating position feedback on the L-shaped connecting plate 4 on the right upright post 2 by using a motor mounting screw, and fastening a right line laser sensor 6 on the upper surface of the L-shaped connecting plate 4 by using a sensor mounting screw 7 to complete the assembly of a right upright post sensor part; repeating the steps to complete the assembly of the left upright sensor part; in the beam sensor part, a T-shaped connecting plate 10 is fixed on a beam 9 through a T-shaped plate fixing screw screwed into a mounting hole 10 a; and (3) fastening the linear laser sensor 11 on the working table surface of the T-shaped connecting plate 10 by using the sensor mounting screw 7 to complete the mounting of the beam sensor part.
In the tenon tool fixture part, a platform linear motor 16 with grating position feedback is fixed on a marble measuring platform 1 in the middle of two vertical columns by using a motor mounting screw, a limiting groove below a baffle 24 is matched with a rectangular guide rail 28, a nut cylinder sleeve 25 is mounted in the middle of the baffle 24 and forms a screw-nut pair with a screw-spindle 27 of a servo motor 18, in the tenon tool fixture, a fixture upper cover 22 and a fixture base 17 are fixedly connected through a tool fixture mounting bolt 21 and a nut 20, and the mounting of an automatic tool fixture 14 is completed; finally, the fixture mounting screws are screwed into the fixture mounting holes 14a, and the tenon tooling fixture 14 is mounted on the table 15 of the platform linear motor 16.
A measuring method of an aviation blade tenon laser scanning measuring machine is characterized in that the method adopts the laser scanning measuring machine to measure; firstly, calibrating a sensor, clamping a tenon to be detected by using a tool clamp, keeping the position of the sensor unchanged, and driving the tenon to be detected to linearly move by using a linear motor to finish line laser single scanning; secondly, scanning the side profile for the second time or directly moving the linear motor workbench reversely to return to the initial position, performing coordination processing on the obtained point cloud data to generate a three-dimensional model with a measuring tenon, extracting characteristics, and performing product qualification evaluation; the measuring method comprises the following specific steps:
firstly, calibrating a sensor, clamping and scanning a tenon to be detected for the first time;
adjusting the positions of the three sensors to a standard installation distance, and calibrating the sensors to ensure that the line laser planes a, b and c are perpendicular to the XOY plane and the YOZ plane, the a, b and c are coplanar, and the measurement planes a and b are superposed; then the tenon 13 to be tested is placed in the tenon tool clamp 14, and the servo motor 18 drives the baffle 24 to move linearly; at this time, the intersection line of the laser plane b of the line laser sensor 12 and the left contour plane of the tenon is L; the linear laser sensors 6, 12 and 11 keep the position and the posture unchanged, and a workbench 15 of a platform linear motor 16 drives a tenon tool clamp 14 to move along the Y axis in the plus direction; at the moment, the line laser sensor 12 scans the left contour surface of the tenon, the line laser sensor 6 scans the right contour surface of the tenon, and the line laser sensor 11 scans two concentric circular arc surfaces M1 and M2 of the tenon, so that the integral contour scanning of the tenon is realized;
secondly, scanning the profile of the side surface for the second time or directly moving the tool clamp in the reverse direction;
if the height of the tenon is larger than the line width of the sensor, the complete outline of the tenon cannot be obtained by single scanning, at the moment, the linear motor 8 is utilized to drive the sensor 6 to move along the plus direction of the Z axis, the left sensor 12 carries out the same position change, and the laser planes a and b move upwards; then, the worktable 15 of the platform linear motor 16 drives the tool clamp 14 to move along the Y axis in the minus direction until the worktable returns to the initial position, and the second scanning of the profiles of the two side surfaces of the tenon is completed; if the complete contour of the tenon is obtained through single scanning, the sensor stops working, and the work table 15 of the linear motor 16 drives the tool clamp 14 to move along the Y axis in the minus direction until the work table returns to the initial position; finally, the servo motor 18 releases the blind 24 through the spindle 27, and carefully removes the four scanned tenons.
Thirdly, processing the point cloud data to generate a tenon three-dimensional model, and performing qualification evaluation;
and carrying out efficient coordination processing on the obtained point cloud data, wherein the efficient coordination processing comprises the following steps: data denoising processing, data simplification and data optimization arrangement; and uniformly converting the coordinate systems of the three sensors into a coordinate system of a measuring table, performing multi-sensor data fusion through a Gaussian process model, and generating a three-dimensional model of the tenon to be measured based on a G1 smooth splicing method for optimizing and adjusting local area control points. And extracting features by using the obtained tenon three-dimensional model and the point cloud data, and comparing the extracted features with a detection standard to obtain measurement data, so that whether the tenon is qualified or not can be judged.
The invention has the advantages that the fixed bridge type measuring platform is adopted to carry three line laser sensors, the times of disassembling and posture adjustment of the sensors are reduced, the pose of the sensors is unchanged in the measuring process, and the repeatability and the accuracy of measurement are improved; the position of the sensor is adjustable, and the measurement adaptability is improved; adopt tenon frock clamp, a plurality of tenons of once scanning have greatly improved tenon efficiency of measurement. A laser scanning measurement method for the tenon line of the aviation blade is established, and the problems that the tenon measurement process is complex and the measurement is not matched with the production rhythm are solved. The measurement repeatability and accuracy are improved; adopt the automatic frock clamp of tenon, a plurality of tenons of once scanning have greatly improved tenon efficiency of measurement. The method can meet the requirement of efficient and precise measurement of the blade tenon of the aero-engine facing to the manufacturing field environment.
Drawings
FIG. 1 is a diagram of a fixed bridge type tenon measuring machine; FIG. 2 is a view of a tenon fixture structure; figure 3-laser plan scan schematic. Wherein 1-marble measuring platform, 1 a-platform countersunk hole, 2-right upright post, 2' -left upright post, 3-L type connecting plate bolt, 4-L type connecting plate, 5-upright post linear motor workbench, 6-right side line laser sensor, 7-sensor mounting screw, 8-upright post linear motor, 9-beam, 9 a-beam hole, 10-T type connecting plate, 11-beam line laser sensor, 12-left side line laser sensor, 13-tenon to be measured, 14-tenon tool clamp, 14 a-clamp mounting hole, 15-platform linear motor workbench, 16-platform linear motor, 17-clamp base, 18-servo motor, 19-servo motor mounting screw, 20-tool clamp mounting nut, 21-clamp mounting bolt, 22-clamp upper cover, 23-movable baffle, 24-rubber cushion, 25-nut cylinder sleeve, 26-bearing, 27-spindle screw, 28-rectangular guide rail, a-laser plane of right side line laser sensor 6, b-laser plane of left side line laser sensor 12, c-laser plane of beam line laser sensor 11, M1-tenon bottom arc surface, M2-tenon step arc surface, and L-laser plane a intersects with tenon left side profile surface.
Detailed Description
The detailed description of the embodiments of the invention is provided with the accompanying drawings and technical solutions.
The invention relates to an aviation blade tenon line laser scanning measuring machine which comprises a fixed bridge type measuring platform, a sensor part and a tenon tool clamp part, and is shown in attached figures 1 and 2. The sensor part consists of three line laser sensor parts which are respectively fixed on a left upright post, a right upright post and a cross beam of the fixed bridge type measuring platform; the tenon frock clamp part is installed on the marble measurement mesa in the middle of the two stands of measuring platform.
The fixed bridge type measuring platform consists of a marble measuring table 1, left and right upright posts 2', 2 and a cross beam 9. A platform counter bore 1a, a groove and a platform motor mounting hole are processed on the side surface of the marble measurement platform 1; threaded holes are processed at the bottoms of the left and right upright posts 2', 2, upright post motor mounting holes are formed in the front surface, and beam mounting tenons and tenon threaded holes are formed in the top. The beam 9 is provided with a beam hole 9a, a T-shaped plate mounting hole and a mounting tongue-and-groove at the bottom. Firstly, the left and right upright posts 2 ', 2 are respectively arranged in the grooves on the surface of the marble measuring table 1, the upright post fixing screws are screwed into the platform countersunk holes 1a and are matched with the threaded holes at the bottoms of the left and right upright posts 2 ', 2, and the left and right upright posts 2 ', 2 are fixed. And finally, matching the beam mounting tenon with the mounting tenon groove at the bottom of the beam, and screwing the beam fixing screw into the beam hole 9a and penetrating into the tenon threaded hole to complete the construction of the fixed bridge type measuring platform.
The sensor part is divided into a left and right column line laser sensor part and a beam line laser sensor part, and the left and right column line laser sensor parts in the left and right column line laser sensor parts have the same structure; fixing an L-shaped connecting plate 4 on an upright post linear motor workbench 5 by using an L-shaped connecting plate bolt, installing a linear motor 8 with grating position feedback on the L-shaped connecting plate 4 of the right upright post 2 by using a motor installation screw, and fastening a right line laser sensor 6 on the upper surface of the L-shaped connecting plate 4 by using a sensor installation screw 7 to complete the assembly of a right upright post sensor part; repeating the steps to complete the assembly of the left upright sensor part; in the beam sensor part, a T-shaped connecting plate 10 is fixed on a beam 9 through a T-shaped plate fixing screw screwed into a mounting hole 10 a; and (3) fastening the beam line laser sensor 11 on the working table surface of the T-shaped connecting plate 10 by using the sensor mounting screw 7 to complete the mounting of the beam sensor part.
In the tenon tool fixture part, a platform linear motor 16 with grating position feedback is fixed on a marble measuring platform 1 in the middle of two vertical columns by using a motor mounting screw, a limiting groove below a baffle 24 is matched with a rectangular guide rail 28, a nut cylinder sleeve 25 is mounted in the middle of the baffle 24 and forms a screw-nut pair with a screw-spindle 27 of a servo motor 18, in the tenon tool fixture, a fixture upper cover 22 and a fixture base 17 are fixedly connected through a tool fixture mounting bolt 21 and a nut 20, and the mounting of an automatic tool fixture 14 is completed; finally, the fixture mounting screws are screwed into the fixture mounting holes 14a, and the tenon tooling fixture 14 is mounted on the table 15 of the platform linear motor 16.
In the embodiment, firstly, three sensors are calibrated, four tenons to be detected 13 are clamped by using a tenon tool clamp 14, the tenons are linearly arranged, the positions of the sensors are adjusted and kept unchanged, and a platform linear motor 16 drives the tenons to be detected to linearly move, so that line laser single scanning is completed. And then, carrying out secondary scanning on the side profile or directly moving the linear motor workbench reversely to return to the initial position, carrying out coordination processing on the obtained point cloud data, generating a three-dimensional model with a measuring tenon, and carrying out feature extraction and product qualification evaluation. The measuring method comprises the following specific steps:
firstly, calibrating a sensor, clamping and scanning the tenon to be measured.
Firstly, the sensor is calibrated by adjusting the sensor to a standard installation distance, so that the line laser planes a, b and c are perpendicular to the XOY plane and the YOZ plane, the a, b and c are coplanar, and the a measuring plane and the b measuring plane are superposed. Then, the tenon 13 to be tested is placed in the tool clamp 14, the servo motor 18 drives the baffle plate 24 to move linearly, clamping force is generated, and four tenons to be tested are clamped at one time. Then, the left and right line laser sensors 12 and 6 and the beam line laser sensor 11 are kept unchanged in position and posture, and the work table 15 of the linear motor 16 drives the tool holder 14 to move in the "+" direction along the Y axis. At this time, the intersection line of the laser plane b of the left line laser sensor 12 and the tenon left contour surface is L, the left line laser sensor 12 scans the tenon left contour surface, the right line laser sensor 6 scans the tenon right contour surface, and the beam line laser sensor 11 scans two concentric arc surfaces M1 and M2 of the tenon, so as to realize the scanning of the whole contour of the tenon, as shown in fig. 3.
And secondly, scanning the profile of the side face for the second time or moving the tenon tool clamp reversely.
If the height of the tenon is larger than the line width of the sensor, the complete outline of the tenon cannot be obtained by single scanning, at the moment, the linear motor 8 is utilized to drive the sensor 6 to move along the plus direction of the Z axis, the sensor 12 carries out the same position change, and the laser planes a and b move upwards simultaneously; then, the platform linear motor workbench 15 drives the tooling fixture 14 to move along the Y axis in the "-" direction until the workbench returns to the initial position, and the second scanning of the profiles of the two side surfaces of the tenon is completed. If the complete profile of the tenon is obtained through single scanning, the sensor stops working, and the platform linear motor workbench 15 drives the tenon tool clamp 14 to move along the Y axis in the minus direction until the workbench returns to the initial position.
Thirdly, generating a tenon three-dimensional model and carrying out qualification evaluation
Carrying out efficient coordination processing on point cloud data obtained by scanning, and carrying out denoising and smoothing processing by using a Gaussian filtering and median filtering method; then, data reduction processing is carried out by using an angle chord height algorithm; then, optimizing and sorting the point cloud data by using a data optimizing and sorting method based on a nonlinear two-class saddle point programming solution; and finally, uniformly converting the measurement coordinate systems of the three sensors into a measurement platform coordinate system, performing multi-sensor data fusion through a Gaussian process model, and generating a three-dimensional model of the tenon to be measured by using a G1 smooth splicing method based on local area control point optimization adjustment. And extracting features through the three-dimensional model and the corresponding point cloud data, comparing the extracted features with a detection standard, and finishing qualification evaluation. After completion, the servo motor 18 releases the blind 24 through the lead screw spindle 27, and the four tenons that have been scanned are carefully removed.
The invention establishes an aviation blade tenon line laser scanning measuring machine and a measuring method, a fixed bridge type measuring platform carries three line laser sensors, the times of detaching the sensors and adjusting the postures are reduced, the pose of the sensors is unchanged in the measuring process, and the measuring repeatability and accuracy are improved; the position of the sensor is adjustable, and the measurement adaptability is improved; adopt the automatic frock clamp of tenon, a plurality of tenons of once scanning have greatly improved tenon efficiency of measurement.
Claims (2)
1. A laser scanning measuring machine for aviation blade tenons is characterized by comprising a fixed bridge type measuring platform, a sensor part and a tenon tool clamp part;
the fixed bridge type measuring platform consists of a marble measuring table (1), left and right upright posts (2', 2) and a cross beam (9); a platform counter bore (1a), a groove and a platform motor mounting hole are machined in the side surface of the marble measurement platform (1); threaded holes are processed at the bottoms of the left and right upright posts (2', 2), upright post motor mounting holes are formed in the front surfaces, and beam mounting tenons and tenon threaded holes are formed in the tops of the upright posts; a beam hole (9a) and a T-shaped plate mounting hole are processed on the beam (9), and a mounting mortise is processed at the bottom of the beam; firstly, respectively installing a left upright post (2 ') and a right upright post (2 ') into grooves on the surface of a marble measuring table (1), screwing an upright post fixing screw into a platform counter bore (1a), and matching with threaded holes at the bottoms of the left upright post (2 ') and the right upright post (2 '), so as to realize the fixation of the left upright post and the right upright post (2 '); finally, a beam mounting tenon is matched with a mounting tenon groove at the bottom of the beam, a beam fixing screw is screwed into a beam hole (9a) and extends into a tenon threaded hole, and the construction of the fixed bridge type measuring platform is completed;
the sensor part is divided into a left and right column line laser sensor part and a beam line laser sensor part, and the left and right column line laser sensor parts in the left and right column line laser sensor parts have the same structure; fixing an L-shaped connecting plate (4) on a left upright post and a right upright post linear motor workbench (5) by using L-shaped connecting plate bolts, installing a linear motor (8) with grating position feedback on the L-shaped connecting plate (4) on the right upright post (2) by using motor installation screws, and fastening a right linear laser sensor (6) on the upper surface of the L-shaped connecting plate (4) by using a sensor installation screw (7) to complete the assembly of a right upright post sensor part; repeating the steps to complete the assembly of the left upright sensor part; in the beam sensor part, a T-shaped connecting plate (10) is fixed on a beam (9) through a T-shaped plate fixing screw screwed into a mounting hole (10 a); a linear laser sensor (11) is fastened on the working table surface of the T-shaped connecting plate (10) by using a sensor mounting screw (7), and the mounting of the beam sensor part is completed;
in the tenon tool clamp part, a platform linear motor (16) with grating position feedback is fixed on a marble measuring platform (1) in the middle of two vertical columns by using a motor mounting screw, a limiting groove below a baffle (24) is matched with a rectangular guide rail (28), a nut cylinder sleeve (25) is mounted in the middle of the baffle (24) and forms a screw-nut pair with a screw-rod main shaft (27) of a servo motor (18), and in the tenon tool clamp, a clamp upper cover (22) and a clamp base (17) are connected and fixed through a tool clamp mounting bolt (21) and a nut (20) to complete the mounting of a tenon tool clamp (14); and finally, screwing a clamp mounting screw into the clamp mounting hole (14a), and mounting the tenon tool clamp (14) on the platform linear motor workbench (15).
2. A laser scanning measuring machine measuring method for aviation blade tenons is characterized in that the method adopts a laser scanning measuring machine to measure; firstly, calibrating a sensor, clamping a tenon to be detected by using a tool clamp, keeping the position of the sensor unchanged, and driving the tenon to be detected to linearly move by using a linear motor to finish line laser single scanning; secondly, scanning the side profile for the second time or directly moving the linear motor workbench reversely to return to the initial position, performing coordination processing on the obtained point cloud data to generate a three-dimensional model with a measuring tenon, extracting characteristics, and performing product qualification evaluation; the measuring method comprises the following specific steps:
firstly, calibrating a sensor, clamping and scanning a tenon to be detected for the first time;
adjusting the positions of the three sensors to a standard installation distance, and calibrating the sensors to ensure that the line laser planes a, b and c are perpendicular to the XOY plane and the YOZ plane, the a, b and c are coplanar, and the measurement planes a and b are superposed; then the tenon (13) to be tested is placed in the tenon tool clamp (14), and the servo motor (18) drives the baffle (24) to move linearly; at the moment, the intersection line of the laser plane b of the left line laser sensor (12) and the left contour surface of the tenon is L; the left and right line laser sensors (12 and 6) and the beam line laser sensor (11) keep the position and the posture unchanged, and the platform linear motor workbench (15) drives the tenon tool clamp (14) to move along the Y axis in the plus direction; at the moment, the left line laser sensor (12) scans the left contour surface of the tenon, the right line laser sensor (6) scans the right contour surface of the tenon, and the beam line laser sensor (11) scans two concentric circular arc surfaces M1 and M2 of the tenon, so that the integral contour scanning of the tenon is realized;
secondly, scanning the profile of the side surface for the second time or directly moving the tool clamp in the reverse direction;
if the height of the tenon is larger than the line width of the sensor, the complete outline of the tenon can not be obtained by single scanning, at the moment, the linear motor (8) is utilized to drive the right line laser sensor (6) to move along the plus direction of the Z axis, the left line laser sensor (12) carries out the same position change, and the laser planes a and b move upwards; then, the platform linear motor workbench (15) drives the tenon tool clamp (14) to move along the Y axis in the minus direction until the workbench returns to the initial position, and secondary scanning of the profiles of the two side faces of the tenon is completed; if the complete contour of the tenon is obtained through single scanning, stopping the sensor; the platform linear motor workbench (15) drives the tenon tool clamp (14) to move along the Y axis in the minus direction until the workbench returns to the initial position;
thirdly, processing the point cloud data to generate a tenon three-dimensional model, and performing qualification evaluation;
and carrying out efficient coordination processing on the obtained point cloud data, wherein the efficient coordination processing comprises the following steps: data denoising processing, data simplification and data optimization arrangement; uniformly converting the coordinate systems of the three sensors into a coordinate system of a measuring table, performing multi-sensor data fusion through a Gaussian process model, and generating a three-dimensional model of the tenon to be measured based on a G1 smooth splicing method for optimizing and adjusting local area control points; extracting features by using the obtained tenon three-dimensional model and the point cloud data, and comparing the extracted features with a detection standard to obtain measurement data, so that whether the tenon is qualified or not can be judged; after the measurement is finished, the servo motor (18) loosens the baffle (24) through the lead screw spindle (27), and the scanned tenon (13) to be measured is carefully taken out.
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| CN112484659A (en) * | 2020-11-12 | 2021-03-12 | 中国航发南方工业有限公司 | Non-contact type engine blade profile detection device |
| CN112484660A (en) * | 2020-11-12 | 2021-03-12 | 中国航发南方工业有限公司 | Non-contact type engine blade profile detection method and engine blade |
| CN112907508A (en) * | 2021-01-14 | 2021-06-04 | 中国第一汽车股份有限公司 | Point cloud virtual matching device and method with tool as carrier |
| CN113414248A (en) * | 2021-06-04 | 2021-09-21 | 西北工业大学 | Method and device for detecting workpiece forming process |
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