A laser and optical composite probe measurement method and device

Abstract

The present invention provides a laser and optical composite probe measurement method and device. Among them, a laser and optical composite probe measurement method, when the composite probe and the probe seat are installed on a three-coordinate machine, can complete the identification and feature measurement of the workpiece to be measured through its optical measurement system, and its specific steps are as follows: importing a CAD model, selecting measurement features, establishing an optical measurement coordinate system, the composite probe obtains multi-point information, the multi-point information includes a large amount of point information from P1 to Pn containing shape and position features obtained at one time, fitting and comparing measurement data based on the large amount of point information from P1 to Pn containing shape and position features, establishing a workpiece coordinate system, and completing the measurement. The present invention also provides a laser and optical composite probe measurement device, including a three-coordinate machine, a side head seat arranged on the three-coordinate machine, a B-angle rotating part arranged at the bottom of the side head seat, and an optical lens assembly connected to the rotating part.

Description

Technical Field

[0001] The present invention provides a laser and optical composite probe measurement technology and structure, in particular to the composite probe coordinate system creation and scanning measurement, and more particularly to a laser and optical composite probe measurement method and device. Background Art

[0002] At present, in order to cope with the market demand for 3D glass measurement or other curved surfaces that require non-contact measurement, point laser probes are mostly used.

[0003] When the point laser probe scans and collects points, the limitation of its minimum point interval makes it difficult to create a coordinate system when using the point laser alone when there are no obvious angular features. If a fixture is used, it is not suitable for high-precision measurement. If the point laser edge finding method must be used to collect points, the features of the measured part and the equipment are extremely demanding and take a lot of time. Therefore, the use of point laser alone has great limitations in measurement schemes, data processing and adaptability. And it is generally used to complete the measurement of small deflection angle features perpendicular to the laser path. When large deflection angle feature measurement is required, the measurement accuracy will decrease rapidly as the deflection angle increases until it cannot be measured. At this time, a fourth-axis turntable needs to be added to complete the measurement, and the measurement is completed in a four-axis linkage mode, which further increases the difficulty in program processing and data superposition, and leads to a significant increase in hardware costs. Summary of the invention

[0004] The present invention provides a measurement technology of a point laser and optical composite probe, which can solve the adaptability problem of a single point laser probe and quickly and conveniently create a coordinate system. It can also solve the problem of reduced accuracy or inability to measure when measuring at large deflection angles, and solve the technical difficulties of four-axis linkage measurement. The new technical solution can directly use the three-axis linkage of the measuring machine to cooperate with the probe angle to complete the measurement.

[0005] The technical solution adopted by the present invention is:

[0006] A laser and optical composite probe measurement method, when the composite probe and the probe base are installed on a three-dimensional coordinate machine, the optical measurement system can be used to complete the identification and feature measurement of the workpiece to be measured. The specific steps are as follows: importing a CAD model, selecting measurement features, establishing an optical measurement coordinate system, the composite probe acquires multi-point information, the multi-point information includes a large amount of point information from P1 to Pn containing shape and position features acquired at one time, fitting and comparing measurement data based on the large amount of point information from P1 to Pn containing shape and position features, establishing a workpiece coordinate system, and completing measurement.

[0007] A laser and optical composite probe measurement method, when the composite probe and the probe base are installed on a three-coordinate machine, the optical measurement system can be used to complete the identification and feature measurement of the workpiece to be measured. The specific steps are as follows: importing a CAD model, selecting measurement features, establishing a point laser measurement coordinate system, and obtaining single-point position information from P1 to P2 and then to P3 through three edge-finding and point-sampling operations. Based on the obtained single-point position information from P1 to P2 and then to P3, measurement data is fitted and compared in the form of points, lines and surfaces to complete the measurement.

[0008] A laser and optical composite probe measurement method, when the composite probe and the probe base are installed on a three-dimensional coordinate machine, the optical measurement system can be used to complete the identification and feature measurement of the workpiece to be measured. The specific steps are as follows: importing a CAD model, selecting measurement features, establishing a composite side head measurement coordinate system, analyzing the measurement features, generating a measurement path and program based on the measurement features, generating a three-axis motion path of the measuring machine based on the measurement path and program, and generating an adjusted laser path to complete the measurement area, fitting and comparing the measurement data, and completing the measurement.

[0009] A laser and optical composite probe measurement method, when the composite probe and the probe seat are installed on a three-coordinate machine, the optical measurement system can be used to complete the identification and feature measurement of the workpiece to be measured. The specific steps are as follows: importing a CAD model, selecting measurement features, establishing a point laser and turntable motion measurement coordinate system, analyzing the measurement features, generating a measurement path and program based on the measurement features, generating a three-axis motion path of the measuring machine based on the measurement path and program, and generating an adjusted laser path to complete the measurement area, fitting and comparing the measurement data, and completing the measurement.

[0010] Furthermore, it also includes the calibration of the composite probe, and its specific steps are as follows: adjust the deflection angle of the laser side head, calibrate the laser side head, rotate the probe base to different A / B angles for calibration and standby use, when the rotation angles are the same, the two side heads respectively measure the standard ball, fit and process the measurement calibration data, and complete the calibration of the relative relationship of the composite side head.

[0011] Furthermore, it also includes the calibration of the composite probe, and its specific steps are as follows: adjust the optical lens deflection angle, calibrate the laser side head, rotate the probe base to different A / B angles for calibration and standby use, when the rotation angles are the same, the two side heads respectively measure the standard ball, fit and process the measurement calibration data, and complete the calibration of the relative relationship of the composite side head.

[0012] Furthermore, the three edge-finding and point-collecting steps include collecting one point of position information P1 from one side edge; collecting two points of position information P2 and P3 from one side edge; and generating a reference plane by fitting P1, P2 and P3.

[0013] The present invention also provides a laser and optical composite probe measuring device, comprising a three-coordinate machine, a side head seat arranged on the three-coordinate machine, a B-angle rotating part arranged at the bottom of the side head seat, an optical lens assembly connected to the rotating part, an external mounting seat arranged on the optical lens assembly, a laser lens assembly arranged on the external mounting seat, and a fine-tuning mechanism arranged on the external mounting seat, wherein the optical lens assembly comprises an A-angle rotating part connected to the B-angle rotating part, the A-angle rotating part is fixed to a turntable, the turntable is fixed to a B-angle adjustment seat arranged inside the optical lens shield, and the B-angle adjustment seat An adjustment frame is arranged at one end, an industrial camera is arranged on the adjustment frame, a lens module is arranged on the industrial camera, and a top ring light is arranged at the front end of the lens module; the fine-tuning mechanism includes an A-angle adjustment seat, a parallel adjustment mechanism arranged at the bottom of the A-angle adjustment seat, and a laser lens assembly arranged on the parallel adjustment mechanism. The laser lens assembly includes a laser lens cover, an optical fiber signal line arranged on the inner center line of the laser lens cover, and a laser lens group coaxially arranged with the optical fiber signal line. The axis of the optical lens assembly, the axis of the laser lens assembly and the axis of the probe seat are parallel.

[0014] Furthermore, the B angle adjustment seat is provided with a B angle adjustment screw; the A angle adjustment seat is provided with an A angle adjustment screw, and the parallel adjustment mechanism is provided with a parallel adjustment screw.

[0015] Furthermore, the three-coordinate machine includes a base, a bracket arranged on the base, a moving beam arranged on the bracket, a measuring base arranged on the moving beam, and the side head seat is arranged on the measuring base.

[0016] The beneficial effects of the present invention are:

[0017] Its composite probe system can be directly installed under the probe base and rotate with the probe base, providing different viewing angles and laser measurement paths.

[0018] It proposes a technical solution for compound probe calibration, which can post-process the data measured by the point laser probe and optical probe and fit them into point information in the same coordinate system. And this solution can be expanded to different probe base rotation angles.

[0019] It proposes a technical solution of using an optical probe to create a coordinate system and a point laser probe for scanning, which effectively solves the problem that the point laser cannot create a coordinate system and that it takes a long time and has low precision to create a coordinate system in certain circumstances.

[0020] It proposes to use the rotatable characteristic of the probe base to improve the problem of reduced accuracy or inability to measure large deflection angle features when measuring with a point laser probe.

[0021] It proposes a solution of segmented superposition measurement and completing measurement through data fitting, and effectively replaces the traditional four-axis linkage measurement technology solution of point laser superposition turntable through the rotation of the probe base and the three-axis linkage of the measuring machine.

[0022] Instruction Manual

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative work.

[0024] Figure 1 This is the standard measurement flow chart for large deflection angle parts.

[0025] Figure 2 This is the schematic diagram of the compound probe calibration and superposition.

[0026] Figure 3 This is a comparison diagram of the principles of measuring the same workpiece using a compound probe and a traditional probe.

[0027] Figure 4 Comparison of the process of creating a coordinate system for a compound probe and a single-point laser probe.

[0028] Figure 5 It is an effective structural form of a compound probe and a schematic diagram of the definition of the A / B angle of rotation of the probe base.

[0029] Figure 6 for Figure 5 The fine-tuning mechanism structure is enlarged and the B angle adjustment installation structure is installed.

[0030] Figure 7 Schematic diagram comparing the transmission point laser path and the compound probe laser path.

[0031] Figure 8 Schematic diagram of the measurement device.

[0032] Fig. 9A \9B\9C\9D are the test diagrams of the present invention. Specific embodiments

[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0034] Reference Figure 1Taking a feature part that requires large deflection angle measurement as an example, its measurement process follows the process of probe calibration, importing CAD model, creating coordinate system, analyzing and generating measurement program, segmented measurement, data fitting, measurement data comparison, and completing measurement.

[0035] The main differences in the technical solutions during the entire measurement process are the calibration methods of the two probes, the methods of creating coordinate systems, the measurement technical solutions, and the requirements for the selection of supporting equipment. The single point laser plus turntable solution represented on the left side requires the calibration of the point laser, the use of the point laser to create a coordinate system, and the matching turntable uses a four-axis linkage measurement technical solution to execute. The composite probe solution shown on the right side requires the calibration of the optical probe and the point laser probe, and the use of the optical probe to create a coordinate system. There is no need for a matching turntable, and the measurement can be completed by rotating the probe base and the three-axis linkage of the measuring machine.

[0036] Reference Figure 2 When calibrating the composite probe, the optical probe and the point laser probe must be calibrated separately first, and the probe holder must be rotated to different A / B angles for calibration as needed. The data measured by the two probes are compared and used through data fitting.

[0037] Reference Figure 4 On the right side, the present invention provides a laser and optical composite probe measurement method. When the composite probe and the probe base are installed on the three-coordinate machine, the optical measurement system can be used to complete the identification and feature measurement of the workpiece to be measured. The specific steps are as follows: import the CAD model, select the measurement features, establish the optical measurement coordinate system, and the composite probe obtains multi-point information. The multi-point information includes a large amount of point information from P1 to Pn containing shape and position features obtained at one time. The measurement data is fitted and compared based on the large amount of point information from P1 to Pn containing shape and position features, and the workpiece coordinate system is established to complete the measurement.

[0038] In the above, the above method can be used in that the composite probe can obtain a large amount of point information from P1 to Pn at one time through the optical probe, and further quickly create a coordinate system in the form of point+line+plane.

[0039] Reference Figure 4On the left side, the present invention provides a laser and optical composite probe measurement method. When the composite probe and the probe seat are installed on the three-coordinate machine, the optical measurement system can be used to complete the identification and feature measurement of the workpiece to be measured. The specific steps are as follows: import the CAD model, select the measurement features, establish a point laser measurement coordinate system, and obtain the single point position information from P1 to P2 and then to P3 through three edge-finding and point-sampling. According to the obtained single point position information from P1 to P2 and then to P3, the measurement data is fitted and compared in the three forms of point, line and surface to complete the measurement. The three edge-finding and point-sampling include collecting one point position information P1 on one side edge; collecting two point position information P2 and P3 on one side edge; and generating a reference surface by fitting P1, P2 and P3.

[0040] In the above, the above method can be used when a single-point laser probe establishes a coordinate system under specific circumstances. It is necessary to obtain P1 / P2 / P3 point information through three long-term edge-finding and point-sampling, and fit the line through P2 / P3, fit the surface through P1 / P2 / P3, and then further create a coordinate system through the principle of point + line + surface.

[0041] Reference Figure 3 On the right side, the present invention provides a laser and optical composite probe measurement method. When the composite probe and the probe base are installed on a three-coordinate machine, the optical measurement system can be used to complete the identification and feature measurement of the workpiece to be measured. The specific steps are as follows: import the CAD model, select the measurement features, establish a composite side head measurement coordinate system, analyze the measurement features, generate a measurement path and program based on the measurement features, generate a three-axis motion path of the measuring machine based on the measurement path and program, and generate an adjusted laser path to complete the measurement area, fit and compare the measurement data, and complete the measurement.

[0042] In the above, the above method can be used in that the composite probe can adjust the laser measurement path by rotating the A / B angle of the probe base, which effectively solves the measurement problem of parts with large deflection angles. The measurement can be completed by rotating the probe base and coordinating the three-axis linkage of the measuring machine.

[0043] Reference Figure 3 On the left side, the present invention provides a laser and optical composite probe measurement method. When the composite probe and the probe base are installed on a three-coordinate machine, the optical measurement system can be used to complete the identification and feature measurement of the workpiece to be measured. The specific steps are as follows: import the CAD model, select the measurement features, establish the point laser and turntable motion measurement coordinate system, analyze the measurement features, generate the measurement path and program according to the measurement features, generate the three-axis motion path of the measuring machine according to the measurement path and program, and generate and adjust the laser path to complete the measurement area, fit and compare the measurement data, and complete the measurement.

[0044] In the above, the above method can be used in a single point laser probe. Due to the limitation of the measurement path, it is impossible to complete the measurement of large deflection feature parts. It needs to be used in a matching state and measured through four-axis linkage. Generate the measurement path according to the selected feature and complete the measurement program.

[0045] Reference Figure 5 In order to complete the above measurement technology solutions, the optical measurement system and the point laser measurement system need to be installed and adjusted. The composition of the optical system and the laser system is given in detail, and the position of the external connection fine-tuning mechanism is indicated. It also includes the calibration of the composite probe, and the specific steps are as follows: adjust the deflection angle of the laser side head, calibrate the laser side head, rotate the probe seat to different A / B angles for calibration and standby use, when the rotation angle is the same, measure the standard ball on both sides of the head respectively, fit and process the measurement calibration data, and complete the calibration of the relative relationship of the composite side head.

[0046] like Fig. 9A As shown in \9B\9C\9D, during the use of a single-point laser, as the deflection angle increases, the laser signal intensity continues to decrease until it becomes unusable. However, due to the rotatable angle of the probe, the laser intensity can be maintained in the intensity range above "signal attenuation-usable".

[0047] The specific steps are as follows: adjust the optical lens deflection angle, calibrate the laser side head, rotate the probe base to different A / B angles for calibration and standby use; when the rotation angles are the same, measure the standard ball on both sides respectively, fit and process the measurement calibration data, and complete the calibration of the relative relationship of the composite side head.

[0048] Reference Figures 6 to 8 The present invention also provides a laser and optical composite probe measuring device, comprising a three-coordinate machine, a side head seat arranged on the three-coordinate machine, a B-angle rotating part arranged at the bottom of the side head seat, an optical lens assembly connected to the rotating part, an external mounting seat arranged on the optical lens assembly, a laser lens assembly arranged on the external mounting seat, and a fine-tuning mechanism arranged on the external mounting seat, wherein the optical lens assembly comprises an A-angle rotating part connected to the B-angle rotating part, the A-angle rotating part is fixed to a turntable, the turntable is fixed to a B-angle adjustment seat arranged inside the optical lens shield, an adjustment frame is arranged at one end of the B-angle adjustment seat, an industrial camera is arranged on the adjustment frame, a lens module is arranged on the industrial camera, and a top ring light is arranged at the front end of the lens module; the fine-tuning mechanism comprises an A-angle adjustment seat, a parallel adjustment mechanism arranged at the bottom of the A-angle adjustment seat, a laser lens assembly arranged on the parallel adjustment mechanism, the laser lens assembly comprises a laser lens shield, an optical fiber signal line arranged on the center line inside the laser lens shield, and a laser lens group arranged coaxially with the optical fiber signal line.

[0049] The B angle adjustment seat is provided with a B angle adjustment screw; the A angle adjustment seat is provided with an A angle adjustment screw, and the parallel adjustment mechanism is provided with a parallel adjustment screw.

[0050] The three-coordinate machine comprises a base, a bracket arranged on the base, a moving beam arranged on the bracket, a measuring base arranged on the moving beam, and the side head seat is arranged on the measuring base.

[0051] By adjusting the A-angle adjustment seat, parallel adjustment mechanism, and B-angle adjustment seat, the parallelism of the optical lens assembly axis, the laser lens assembly axis, and the probe seat axis can be effectively guaranteed to meet the subsequent measurement and data superposition requirements.

[0052] The technical solutions disclosed in the embodiments of the present invention are introduced in detail above. The principles and implementation methods of the embodiments of the present invention are explained in this article using specific embodiments. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A laser and optical composite probe measuring device, characterized in that: The invention comprises a three-coordinate machine, a side head seat arranged on the three-coordinate machine, a B-angle rotating part arranged at the bottom of the side head seat, an optical lens assembly connected to the rotating part, an external mounting seat arranged on the optical lens assembly, a laser lens assembly arranged on the external mounting seat, and a fine-tuning mechanism arranged on the external mounting seat, wherein the optical lens assembly comprises an A-angle rotating part connected to the B-angle rotating part, the A-angle rotating part is fixed to a turntable, the turntable is fixed to a B-angle adjustment seat arranged inside an optical lens shield, an adjustment frame is arranged at one end of the B-angle adjustment seat, an industrial camera is arranged on the adjustment frame, a lens module is arranged on the industrial camera, and a top ring light is arranged at the front end of the lens module; the fine-tuning mechanism comprises an A-angle adjustment seat, a parallel adjustment mechanism arranged at the bottom of the A-angle adjustment seat, and a laser lens assembly arranged on the parallel adjustment mechanism, the laser lens assembly comprises a laser lens shield, an optical fiber signal line arranged on the center line inside the laser lens shield, a laser lens group arranged coaxially with the optical fiber signal line, and the axis of the optical lens assembly, the axis of the laser lens assembly and the axis of the probe seat are parallel.

2. The laser and optical composite probe measuring device according to claim 1, characterized in that: The B angle adjustment seat is provided with a B angle adjustment screw; the A angle adjustment seat is provided with an A angle adjustment screw, and the parallel adjustment mechanism is provided with a parallel adjustment screw.

3. The laser and optical composite probe measuring device according to claim 2, characterized in that: The three-coordinate machine comprises a base, a bracket arranged on the base, a moving beam arranged on the bracket, a measuring base arranged on the moving beam, and the side head seat is arranged on the measuring base.

4. The laser and optical composite probe measuring device according to claim 3, characterized in that: The following measurement method is used for measurement: when the compound probe and the probe base are installed on the three-coordinate machine, the optical measurement system can be used to complete the identification and feature measurement of the workpiece to be measured. The specific steps are as follows: import the CAD model, select the measurement features, establish the optical measurement coordinate system, and the compound probe obtains multi-point information. The multi-point information includes a large amount of point information from P1 to Pn containing shape and position features obtained at one time. Based on the large amount of point information from P1 to Pn containing shape and position features, the measurement data is fitted and compared, the workpiece coordinate system is established, and the measurement is completed.

5. The laser and optical composite probe measuring device according to claim 4, characterized in that: When the compound probe and probe base are installed on the three-coordinate machine, the optical measurement system can be used to complete the identification and feature measurement of the workpiece to be measured. The specific steps are as follows: import the CAD model, select the measurement features, establish a point laser measurement coordinate system, and obtain the single-point position information from P1 to P2 and then to P3 through three edge-finding and point-sampling. Based on the obtained single-point position information from P1 to P2 and then to P3, the measurement data is fitted and compared in the form of points, lines, and surfaces to complete the measurement.

6. The laser and optical composite probe measuring device according to claim 5, characterized in that: When the compound probe and probe base are installed on the three-coordinate machine, the optical measurement system can be used to complete the identification and feature measurement of the workpiece to be measured. The specific steps are as follows: import the CAD model, select the measurement features, establish the compound side head measurement coordinate system, analyze the measurement features, generate the measurement path and program based on the measurement features, generate the three-axis motion path of the measuring machine based on the measurement path and program, and generate and adjust the laser path to complete the measurement area, fit and compare the measurement data, and complete the measurement.

7. The laser and optical composite probe measuring device according to claim 6, characterized in that: When the compound probe and probe base are installed on the three-coordinate machine, the optical measurement system can be used to complete the identification and feature measurement of the workpiece to be measured. The specific steps are as follows: import the CAD model, select the measurement features, establish the point laser and turntable motion measurement coordinate system, analyze the measurement features, generate the measurement path and program based on the measurement features, generate the three-axis motion path of the measuring machine based on the measurement path and program, and generate and adjust the laser path to complete the measurement area, fit and compare the measurement data, and complete the measurement.

8. The laser and optical composite probe measuring device according to claim 7, characterized in that: It also includes the calibration of the compound probe, and its specific steps are as follows: adjust the deflection angle of the laser side head, calibrate the laser side head, rotate the probe base to different A / B angles for calibration and standby use, when the rotation angles are the same, measure the standard ball on both sides respectively, fit and process the measurement calibration data, and complete the calibration of the relative relationship of the compound side head.

9. The laser and optical composite probe measuring device according to claim 8, characterized in that: It also includes the calibration of the compound probe, and its specific steps are as follows: adjust the optical lens deflection angle, calibrate the laser side head, rotate the probe base to different A / B angles for calibration and standby use, when the rotation angles are the same, the two side heads respectively measure the standard ball, fit and process the measurement calibration data, and complete the calibration of the relative relationship of the compound side head.

10. The laser and optical composite probe measuring device according to claim 9, characterized in that: The three edge-finding and point-collecting steps include collecting one point of position information P1 on one side edge; collecting two points of position information P2 and P3 on one side edge; and generating a reference plane by fitting P1, P2 and P3.

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