Laser and optical composite probe measurement device and method

Abstract

The present invention discloses a laser and optical composite probe measuring device and method, belonging to the field of measurement technology. The device includes: a three-coordinate measuring mechanism and a controller; the three-coordinate measuring mechanism includes: a three-coordinate measuring table, a Y-axis slide rail is arranged on one side of the surface of the three-coordinate measuring table, the upper surface of the Y-axis slide rail is movably connected with a supporting column, and the supporting column moves along the Y-axis slide rail; the upper surface of the supporting column is inlaid with an X-axis beam, and the outer surface of the X-axis beam is movably connected with a sliding frame, and the sliding frame slides along the X-axis beam; the bottom of the sliding frame is inlaid with a Z-axis rod, the bottom of the Z-axis rod is fixedly connected with a laser probe, the side wall of the Z-axis rod is connected with an annular guide rail, the annular guide rail is slidably connected with a sliding device, and the side wall of the sliding device is connected with a mechanical arm. When measuring the defects of the workpiece to be measured, the upper surface and the side surface are measured respectively by a laser probe and an optical probe, so that the detection is more accurate.

Description

Technical Field

[0001] The present invention relates to the field of measurement technology, and in particular to a laser and optical composite probe measurement device and method. Background Art

[0002] With the improvement of machining level and computer software technology, coordinate measuring machine is becoming the most widely used and most functional measuring instrument in the field of length and defect measurement. In the existing technology, point laser probe is mostly used for non-contact surface defect detection.

[0003] When a point laser probe scans and collects points, it is generally used to complete the measurement of features with small deflection angles perpendicular to the laser path. When it is necessary to measure features with large deflection angles, the measurement accuracy will decrease rapidly as the deflection angle increases until it cannot be measured. Summary of the invention

[0004] In order to solve the problems of the prior art, the present invention provides a laser and optical composite probe measurement device and method.

[0005] In one aspect, a laser and optical composite probe measuring device is provided, the device comprising: a three-coordinate measuring mechanism and a controller;

[0006] The three-coordinate measuring mechanism comprises: a three-coordinate measuring table, a Y-axis slide rail is arranged on one side of the surface of the three-coordinate measuring table, a support column is movably connected to the upper surface of the Y-axis slide rail, and the support column moves along the Y-axis slide rail; an X-axis crossbeam is inlaid and connected to the upper surface of the support column, a sliding frame is movably connected to the outer surface of the X-axis crossbeam, and the sliding frame slides along the X-axis crossbeam; a Z-axis rod is inlaid and connected to the bottom of the sliding frame, and a laser probe is fixedly connected to the bottom of the Z-axis rod;

[0007] An annular guide rail is connected to the side wall of the Z-axis rod, a sliding device is slidably connected to the annular guide rail, a mechanical arm is connected to the side wall of the sliding device, and an optical probe is fixedly connected to the end of the mechanical arm away from the sliding device;

[0008] The three-coordinate measuring mechanism, the sliding device, the mechanical arm and the optical probe are all connected to the controller for communication.

[0009] Further, the sliding device comprises: a sliding block;

[0010] Two connecting blocks are fixedly connected to one side wall of the sliding block, and a groove is formed on the connecting block. A pulley is installed in the groove, and the two pulleys are opposite to each other;

[0011] The pulleys are all connected with a driving device, and the driving device is in communication connection with the controller;

[0012] The pulleys all extend out of the grooves, and a gap is provided between the two pulleys. The two pulleys are in contact with the upper and lower surfaces of the annular guide rail respectively.

[0013] Furthermore, baffles are fixedly connected to the upper and lower surfaces of the annular guide rail, and the baffles are located on a side of the annular guide rail away from the Z-axis rod;

[0014] A notch is provided between the connecting block and the sliding block, and the two notches and the gap are connected;

[0015] The baffle is located in the notch.

[0016] Further, the mechanical arm comprises: a first joint;

[0017] The first joint is fixedly connected to the slider, and the first joint is located on a side wall of the slider away from the connecting block;

[0018] The end of the first joint away from the slider is connected to the second joint via a first swing joint, the end of the second joint away from the first swing joint is connected to the second joint via a second swing joint, and the end of the second joint away from the second swing joint is fixedly connected to the optical probe;

[0019] The first swing joint and the second swing joint are both in communication connection with the controller.

[0020] Furthermore, an angle encoder is installed on each of the first swing joint and the second swing joint, and the angle encoder is communicatively connected with the controller.

[0021] On the other hand, a measurement method of the laser and optical composite probe measuring device is provided, the method comprising:

[0022] Import the three-dimensional model of the test piece into the controller and determine the contour coordinates of the three-dimensional model;

[0023] Placing the workpiece to be measured on the workbench of the three-dimensional coordinate measuring table, and adjusting the three-dimensional coordinate measuring assembly to ensure that at least one feature point of the workpiece to be measured coincides with the coordinates of the feature point corresponding to the three-dimensional model;

[0024] The laser probe measures the coordinates of the upper surface of the workpiece to be measured;

[0025] Control the sliding device to slide 360° on the circular guide rail, and measure the side coordinate value of the workpiece to be measured by the optical probe;

[0026] The standard coordinate values ​​of the upper surface and the side of the three-dimensional model are extracted respectively, and the coordinate values ​​of the upper surface of the test piece are compared with the standard coordinate values ​​of the upper surface of the three-dimensional model to determine whether the upper surface of the test piece meets the standard; the side coordinate values ​​of the test piece are compared with the standard coordinate values ​​of the side of the three-dimensional model to determine whether the side of the test piece meets the standard.

[0027] Furthermore, before the optical probe measures the side coordinate value of the workpiece to be measured, the angle encoder controls the first swing joint to swing according to the height of the laser probe, so as to adjust the height of the optical probe to be consistent with that of the laser probe;

[0028] According to the deflection angle of the side surface of the workpiece to be measured, the angle encoder controls the second swing joint to swing, and adjusts the angle of the optical probe to ensure that the optical probe can measure the side surface of the workpiece to be measured.

[0029] Furthermore, during the comparison, a first coordinate deviation threshold range between the upper surface standard coordinate value of the three-dimensional model and the upper surface coordinate value of the test piece is preset, and a second coordinate deviation threshold range between the side standard coordinate value of the three-dimensional model and the side coordinate value of the test piece is preset;

[0030] If the coordinate difference between the upper surface coordinate value of the test piece and the upper surface standard coordinate value of the three-dimensional model is within the first coordinate deviation threshold range, the standard is met; otherwise, the standard is not met;

[0031] If the coordinate difference between the side coordinate value of the test piece and the side standard coordinate value of the three-dimensional model is within the second coordinate deviation threshold range, the standard is met; otherwise, the standard is not met.

[0032] The beneficial effect brought about by the technical solution provided by the embodiment of the present invention is as follows: in the present invention, a laser probe perpendicular to the workpiece to be measured is provided for measuring the upper surface of the workpiece to be measured, and an optical probe that can be tilted and can rotate 360° around the Z-axis rod is also provided for measuring the side surface of the workpiece to be measured with a large deflection angle. When measuring the defects of the workpiece to be measured, the upper surface and the side surface are measured respectively by the laser probe and the optical probe, and compared with the standard coordinate values ​​of the upper surface and the standard coordinate values ​​of the side surface respectively to determine whether they meet the standards, thereby improving the problem of decreased accuracy or inability to measure large deflection angle features measured by the laser probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a structural schematic diagram of a laser and optical composite probe measuring device provided by the present invention;

[0035] Figure 2 It is a structural schematic diagram of a ring guide rail provided by the present invention;

[0036] Figure 3 It is a structural schematic diagram of a sliding device provided by the present invention;

[0037] Figure numerals: 1. three-coordinate measuring table; 2. Y-axis slide rail; 3. supporting column; 4. X-axis beam; 5. sliding frame; 6. Z-axis rod; 7. laser probe; 8. circular guide rail; 9. sliding device; 10. optical probe; 11. slider; 12. connecting block; 13. groove; 14. pulley; 15. gap; 16. baffle; 17. notch; 18. first joint; 19. first swing joint; 20. second joint; 21. second swing joint; 22. second joint. DETAILED DESCRIPTION

[0038] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] See also Figure 1-3 A laser and optical composite probe measuring device comprises: a three-coordinate measuring mechanism and a controller; the three-coordinate measuring mechanism comprises: a three-coordinate measuring table 1, a Y-axis slide rail 2 is arranged on one side of the surface of the three-coordinate measuring table 1, a supporting column 3 is movably connected to the upper surface of the Y-axis slide rail 2, and the supported column 3 moves along the Y-axis slide rail 2; an X-axis crossbeam 4 is inlaid and connected to the upper surface of the supporting column 3, a sliding frame 5 is movably connected to the outer surface of the X-axis crossbeam 4, and the sliding frame 5 slides along the X-axis crossbeam 4; a Z-axis rod 6 is inlaid and connected to the bottom of the sliding frame 5, a laser probe 7 is fixedly connected to the bottom of the Z-axis rod 6, an annular guide rail 8 is connected to the side wall of the Z-axis rod 6, and a sliding device 9 is slidably connected to the annular guide rail 8.

[0040] The sliding device 9 includes: a slider 11, two connecting blocks 12 are fixedly connected to one side wall of the slider 11, a groove 13 is opened on the connecting block 12, a pulley 14 is installed in the groove 13, the two pulleys 14 are opposite to each other, the pulleys 14 are connected to a driving device, the pulleys 14 extend out of the groove 13, and a gap 15 is provided between the two pulleys 14, the two pulleys 14 are in contact with the upper and lower surfaces of the annular guide rail 8 respectively, the upper and lower surfaces of the annular guide rail 8 are fixedly connected with a baffle 16, and the baffle 16 is located on the side of the annular guide rail 8 away from the Z-axis rod 6; a notch 17 is provided between the connecting block 12 and the slider 11, the two notches 17 and the gap 15 are connected, and the baffle 16 is located in the notch 17.

[0041] The sliding device 9 is connected with a mechanical arm, which includes: a first joint 18, the first joint 18 is fixedly connected to the slider 11, and the first joint 18 is located on the side wall of the slider 11 away from the connecting block 12, the end of the first joint 18 away from the slider 11 is connected to the second joint 20 through the first swing joint 19, the end of the second joint 20 away from the first swing joint 19 is connected to the second joint 22 through the second swing joint 21, the end of the second joint 22 away from the second swing joint 21 is fixedly connected to the optical probe 10, and the first swing joint 19 and the second swing joint 21 are both installed with angle encoders. Among them, the three-coordinate measuring mechanism, the sliding device 9, the mechanical arm, the optical probe 10, the driving device, the first swing joint 19, the second swing joint 21 and the angle encoder are all connected to the controller for communication, and the controller can be a computer or the like.

[0042] The measuring method using the laser and optical composite probe measuring device can be as follows: importing the three-dimensional model of the workpiece to be measured into the controller, determining the contour line coordinates of the three-dimensional model, presetting in the controller a first coordinate deviation threshold range between the upper surface standard coordinate value of the three-dimensional model and the upper surface coordinate value of the workpiece to be measured, and presetting a second coordinate deviation threshold range between the side standard coordinate value of the three-dimensional model and the side coordinate value of the workpiece to be measured; according to the height of the laser probe 7, the controller controls the first swing joint 19 to swing through the angle encoder, adjusts the height of the optical probe 10 to be consistent with that of the laser probe 7, and according to the deflection angle of the side of the workpiece to be measured, the controller controls the second swing joint 21 to swing through the angle encoder, adjusts the angle of the optical probe 10, and ensures that the optical probe 10 can measure the side of the workpiece to be measured; placing the workpiece to be measured on the workbench of the three-dimensional coordinate measuring table 1, and adjusting the three-dimensional coordinate measuring table 1. The measuring component ensures that at least one feature point of the workpiece to be measured coincides with the feature point coordinates corresponding to the three-dimensional model. The controller controls the laser probe 7 to measure the coordinate value of the upper surface of the workpiece to be measured. The controller controls the driving device, and the driving device drives the pulley to rotate, so that the slider drives the mechanical arm to slide 360° on the annular guide rail 8, and controls the optical probe 10 to measure the side coordinate value of the workpiece to be measured through the controller; the controller extracts the upper surface standard coordinate value of the three-dimensional model and the side standard coordinate value of the three-dimensional model respectively, and determines whether the coordinate difference between the upper surface coordinate value of the workpiece to be measured and the upper surface standard coordinate value of the three-dimensional model is within the first coordinate deviation threshold range. If so, it meets the standard, otherwise, it does not meet the standard; and determines whether the coordinate difference between the side coordinate value of the workpiece to be measured and the side standard coordinate value of the three-dimensional model is within the second coordinate deviation threshold range. If so, it meets the standard, otherwise, it does not meet the standard.

[0043] It is worth noting that, in the present invention, a laser probe perpendicular to the workpiece to be measured is provided for measuring the upper surface of the workpiece to be measured, and an optical probe that can be tilted and rotated 360° around the Z-axis rod is also provided for measuring the side surfaces of the workpiece to be measured with large deflection angles. When measuring defects of the workpiece to be measured, the upper surface and the side surfaces are measured respectively by the laser probe and the optical probe, and compared with the standard coordinate values ​​of the upper surface and the standard coordinate values ​​of the side surfaces respectively to determine whether they meet the standards, thereby improving the problem of decreased accuracy or inability to measure large deflection angle features measured by a point laser probe.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser and optical composite probe measuring device, characterized in that: The device comprises: a three-coordinate measuring mechanism and a controller; The three-coordinate measuring mechanism comprises: a three-coordinate measuring platform (1); a Y-axis slide rail (2) is arranged on one side of the surface of the three-coordinate measuring platform (1); the upper surface of the Y-axis slide rail (2) is movably connected to a support column (3), and the support column (3) moves along the Y-axis slide rail (2); the upper surface of the support column (3) is inlaid with an X-axis crossbeam (4); the outer surface of the X-axis crossbeam (4) is movably connected to a sliding frame (5), and the sliding frame (5) slides along the X-axis crossbeam (4); the bottom of the sliding frame (5) is inlaid with a Z-axis rod (6), and the bottom of the Z-axis rod (6) is fixedly connected to a laser probe (7). The side wall of the Z-axis rod (6) is connected to an annular guide rail (8), a sliding device (9) is slidably connected to the annular guide rail (8), a mechanical arm is connected to the side wall of the sliding device (9), and an optical probe (10) is fixedly connected to the end of the mechanical arm away from the sliding device (9); The three-coordinate measuring mechanism, the sliding device (9), the mechanical arm and the optical probe (10) are all in communication connection with the controller; The sliding device (9) comprises: a slider (11); two connecting blocks (12) are fixedly connected to one side wall of the slider (11); a groove (13) is provided on the connecting block (12); a pulley (14) is installed in the groove (13); the two pulleys (14) are opposite to each other; the pulleys (14) are both connected to a driving device; the driving device is communicatively connected to the controller; the pulleys (14) are both extended out of the groove (13); a gap (15) is provided between the two pulleys (14); the two pulleys (14) are respectively in contact with the upper and lower surfaces of the annular guide rail (8); The mechanical arm comprises: a first joint (18); the first joint (18) is fixedly connected to the slider (11), and the first joint (18) is located on a side wall of the slider (11) away from the connecting block (12); an end of the first joint (18) away from the slider (11) is connected to a second joint (20) via a first swing joint (19), an end of the second joint (20) away from the first swing joint (19) is connected to a third joint (22) via a second swing joint (21), and an end of the third joint (22) away from the second swing joint (21) is fixedly connected to the optical probe (10); the first swing joint (19) and the second swing joint (21) are both communicatively connected to the controller; Angle encoders are installed on both the first swing joint (19) and the second swing joint (21), and the angle encoders are communicatively connected with the controller.

2. The laser and optical composite probe measuring device according to claim 1, characterized in that: The upper and lower surfaces of the annular guide rail (8) are both fixedly connected with baffles (16), and the baffles (16) are located on a side of the annular guide rail (8) away from the Z-axis rod (6); A notch (17) is provided between the connecting block (12) and the sliding block (11), and the two notches (17) and the gap (15) are connected. The baffle (16) is located in the notch (17).

3. A measuring method according to any one of claims 1-2, characterized in that: The method comprises: Import the three-dimensional model of the test piece into the controller and determine the contour coordinates of the three-dimensional model; Placing the workpiece to be measured on a workbench of a three-dimensional coordinate measuring table (1), and adjusting the three-dimensional coordinate measuring components to ensure that at least one feature point of the workpiece to be measured coincides with the coordinates of the feature point corresponding to the three-dimensional model; The laser probe (7) measures the coordinate values ​​of the upper surface of the workpiece to be measured; Controlling the sliding device (9) to slide 360° on the annular guide rail (8), and measuring the side coordinate value of the workpiece to be measured by the optical measuring head (10); Extract the standard coordinate values ​​of the upper surface of the 3D model and the standard coordinate values ​​of the side of the 3D model respectively. Compare the coordinate values ​​of the upper surface of the test piece with the standard coordinate values ​​of the upper surface of the three-dimensional model to determine whether the upper surface of the test piece meets the standard; compare the side coordinate values ​​of the test piece with the standard side coordinate values ​​of the three-dimensional model to determine whether the side of the test piece meets the standard.

4. The measuring method of the laser and optical composite probe measuring device according to claim 3, before the optical probe (10) measures the side coordinate value of the workpiece to be measured, the angle encoder controls the first swing joint (19) to swing according to the height of the laser probe (7), and adjusts the height of the optical probe (10) to be consistent with that of the laser probe (7); According to the deflection angle of the side surface of the object to be measured, the angle encoder controls the second swing joint (21) to swing, and adjusts the angle of the optical measuring head (10), so as to ensure that the optical measuring head (10) measures the side surface of the object to be measured.

5. The measuring method of the laser and optical composite probe measuring device according to claim 4, characterized in that: During the comparison, a first coordinate deviation threshold range is preset between the upper surface standard coordinate value of the three-dimensional model and the upper surface coordinate value of the object to be measured, and a second coordinate deviation threshold range is preset between the side standard coordinate value of the three-dimensional model and the side coordinate value of the object to be measured; If the coordinate difference between the upper surface coordinate value of the test piece and the upper surface standard coordinate value of the three-dimensional model is within the first coordinate deviation threshold range, the standard is met; otherwise, the standard is not met; If the coordinate difference between the side coordinate value of the test piece and the side standard coordinate value of the three-dimensional model is within the second coordinate deviation threshold range, the standard is met; otherwise, the standard is not met.

Images