Automatic detection device and method for radial laser spot welding of a circular assembly

Abstract

This invention belongs to the field of digital measurement technology, specifically relating to an automatic detection device and method for radial laser weld seams of circular components. The device includes a base, on which a rotating stage is mounted for mounting the circular component to be tested. The rotating stage can drive the circular component to be tested to rotate. A column support is also provided on the base, with linear guide rails at the top and bottom of the column support. An optical imaging system is slidably mounted on the linear guide rails. This invention can realize automated detection of laser spot weld dimensions, spacing, position, and appearance quality. The detection process has a high degree of automation and high accuracy, and can replace manual measurement, improving the detection efficiency and quality of the welding quality of this core component.

Description

Technical Field

[0001] This invention belongs to the field of digital measurement technology, specifically relating to an automatic detection device and method for radial laser weld seams of circular components. Background Technology

[0002] In the aerospace field, air bearings are increasingly widely used due to their unique performance advantages. A core air bearing component utilizes laser spot welding to weld one end of multiple fan-shaped foils onto a circular base plate, such as... Figure 1 As shown, multiple laser spot welds are evenly distributed radially on the component. The quality of laser welding (including weld spot size, spacing, location, and appearance quality) has a significant impact on product performance and must be 100% inspected to ensure welding quality.

[0003] Because laser weld joints are not irregularly circular and are small in size and volume (less than Φ0.8mm, height less than 0.02mm), standard inspection equipment such as imaging instruments cannot automatically measure their size, spacing, and position. Currently, inspectors can only manually select and inspect each joint one by one after obtaining magnified images using a microscope, which is inefficient. For the appearance quality of the weld joints, inspectors rely on experience for visual inspection, resulting in inconsistent inspection results that are difficult to meet product requirements. Summary of the Invention

[0004] The purpose of this invention is to address the problem that the aforementioned manual measurement methods require manual point selection and inspection, resulting in low efficiency, poor consistency of inspection results, and difficulty in meeting product requirements. Therefore, the purpose of this invention is to provide an automatic inspection device and method for radial laser spot welds of circular components based on image acquisition and processing technology. This invention can achieve automated inspection of laser spot weld size, spacing, position, and appearance quality. The inspection process has a high degree of automation and high accuracy, and can replace manual measurement, improving the inspection efficiency and quality of the welding quality of this core component.

[0005] The technical solution of this invention: An automatic inspection device for radial laser spot welding of circular components includes a base, on which a rotating stage is provided for mounting the circular component to be tested. The rotating stage can drive the circular component to be tested to rotate. The base is also provided with a column support, and a linear guide rail is provided at the top and bottom of the column support. An optical imaging system is slidably mounted on the linear guide rail.

[0006] Furthermore, it also includes a calibration device, which is mounted on a rotating stage, and the circular component to be tested is mounted on the calibration device.

[0007] Furthermore, the calibration device is concentrically positioned on the rotary table and is mounted on the rotary table via vacuum adsorption.

[0008] Furthermore, the calibration device is provided with a dot for calibration.

[0009] Furthermore, the optical imaging system includes an optical camera, a lens, and an illumination device.

[0010] Furthermore, it also includes an electrical control cabinet, which is connected to the rotary table and drives the rotary table to rotate. The electrical control cabinet is also connected to the optical imaging system and drives the servo motor installed at the top and bottom of the column support, which in turn drives the optical imaging system installed on the servo motor to slide on the linear guide rail.

[0011] Furthermore, it also includes a control box, which is connected to the electrical control cabinet and provides instructions to the electrical control cabinet.

[0012] Furthermore, it also includes a display, which is connected to the control box to display the status and position of the rotary table, the status and position of the optical imaging system, and the status of the electrical control cabinet.

[0013] A method for automatically inspecting radial laser spot welds on circular components using the aforementioned device, comprising: Step 1: Place the calibration device concentrically on the rotating stage to calibrate the accuracy of the optical imaging system; Step 2: Place the circular component to be tested concentrically on the rotating table, so that the first weld of the circular component to be tested is located in the zero position direction, that is, parallel to the direction of the linear guide rail; Step 3: The optical imaging system takes a picture of the first weld seam to acquire an image; if the weld seam is too long and exceeds the field of view, the optical imaging system is controlled to move along the linear guide rail; a complete image of the weld seam is acquired by stitching the images together. Step 4: The software, based on image processing and AI learning technology, completes the inspection of the laser weld seam, including the size, spacing, position, and appearance quality of the laser weld points. Step 5: Rotate the rotary table to bring the second weld of the circular component under test to the zero position; repeat steps 3 to 4 to complete the inspection of this weld. Step 6: Repeat steps 3 to 4 until all welds in the radial direction have been inspected.

[0014] The beneficial effects of this invention are: To address the problems of low efficiency and poor inspection consistency in existing radial laser spot welding inspection methods for circular components, this invention provides an automatic inspection device and method for radial laser spot welds on circular components. This method employs machine vision to achieve automated and rapid inspection of radial laser weld seams on circular components. The inspection device utilizes a vertical measuring structure, with a rotary table mounted on a base, on which the component to be inspected is placed. A linear guide rail is fixedly mounted on the upper end of a column, and an optical imaging system is mounted on the linear guide rail. The position of the optical imaging system and the rotation angle of the rotary table have relatively low accuracy requirements and can be directly calculated from the number of rotations of the drive motor, or directly read after installing a linear grating and angle encoder.

[0015] This invention enables automated inspection of the size, spacing, position, and appearance quality of laser spot welds. The inspection process is highly automated and accurate, and can replace manual measurement, thereby improving the inspection efficiency and quality of the welding quality of this core component. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the device of the present invention; Figure 2 This is a schematic diagram of the overall three-dimensional structure of the device of the present invention; Figure 3 This is a three-dimensional structural diagram of the column-linear guide rail of the device of the present invention; Figure 4 This is a three-dimensional structural diagram of the optical imaging system of the device of the present invention; Figure 5 This is a three-dimensional structural diagram of the rotary table of the device of the present invention; Figure 6 This is a schematic diagram of the calibration device of the present invention.

[0017] Figure 7 This is a schematic diagram of the measurement process of the method of the present invention. Detailed Implementation

[0018] The following description of embodiments provides a more detailed explanation of the specific implementation of the present invention, including the shape and structure of each component, the relative positions and connections between the parts, the function and working principle of each part, the manufacturing process, and the operation and use methods, in order to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the concept and technical solution of the present invention. One embodiment of the present invention provides an automatic inspection device for radial laser spot welding of circular components, including a base 1, a column support 2, a linear guide rail 3, a rotary table 4, an optical imaging system 5, and a calibration device. The base 1 is provided with a rotary table 4 for mounting the circular component to be tested, and the rotary table 4 can drive the circular component to be tested to rotate. The base 1 is also provided with a column support 2, and the top and bottom of the column support 2 are provided with a linear guide rail 3. The optical imaging system 5 is slidably mounted on the linear guide rail 3. The calibration device is mounted on the rotary table 4, and the circular component to be tested is mounted on the calibration device.

[0019] The calibration device is concentrically arranged with the rotating stage 4 and is set on the rotating stage 4 by vacuum adsorption. The calibration device is provided with calibration dots, and the size and spacing information of the dots are provided by the high-precision image instrument.

[0020] The optical imaging system 5 includes an optical camera, a lens, and an illumination device, which are mounted on a slide of the linear guide rail 3 via a bracket fixture; it can move horizontally along the linear guide rail 3 to achieve image stitching of larger-sized components under test. It also includes an electrical control cabinet, which is connected to the rotary table 4 and drives the rotary table 4 to rotate. The electrical control cabinet is also connected to the optical imaging system 5 and drives the servo motor installed at the top and bottom of the column support 2, which in turn drives the optical imaging system 5 installed on the servo motor to slide on the linear guide rail 3. The control box is connected to the electrical control cabinet and provides instructions to the electrical control cabinet.

[0021] It also includes a control box, which serves as the control hub for the entire device and is used to control the operation of components such as the electrical control cabinet, the rotary table 4, and the optical imaging system 5.

[0022] This also includes a printer, which is connected to the control box and used to print the final test report.

[0023] It also includes a start button, which is connected to the electrical control cabinet and used to control the electrical control cabinet to start or stop working.

[0024] It also includes a display, which is connected to the control box to display the status and position of the rotary table 4, the status and position of the optical imaging system 5, and the status of the electrical control cabinet. The display is mounted on the operating table by a flexible bracket, which can ensure that the display can rotate in various directions and angles, making it convenient for personnel to view the test results and operate.

[0025] In this embodiment, the column support 2 includes a vertical welding support and a horizontal support. The vertical welding support is bolted to the base 1, and the horizontal support is horizontally positioned at the top of the welding support. A linear guide rail and a servo motor are installed at the bottom of the horizontal support. An optical imaging system is installed on the linear guide rail 3. The servo motor can drive the optical imaging system 5 to slide on the linear guide rail. When the optical imaging system 5 cannot completely capture the weld of the circular component to be inspected, multiple weld images can be captured by moving the position of the optical imaging system 5. Then, the images can be stitched together by the software in the control box.

[0026] In this embodiment, the rotary table 4 includes a turntable, which is driven to rotate by a hollow rotating platform set at its bottom. A servo motor is set on the side of the hollow rotating platform and is driven by the electrical control cabinet to drive the hollow rotating platform to rotate, which in turn drives the turntable to rotate.

[0027] In this embodiment, the calibration device is a ring-shaped part with several radially arranged dots. In use, the dots on the calibration device are calibrated and adjusted by the optical imaging system 5 to obtain the zero position of the optical imaging system 5.

[0028] A second embodiment of the present invention provides a method for automatically detecting radial laser spot welds on circular components using the aforementioned device, comprising: Step 1: Place the calibration device concentrically on the rotary table 4 to calibrate the accuracy of the optical imaging system; Step 2: Place the circular component to be tested concentrically on the rotary table 4, so that the first weld of the circular component to be tested is located in the zero position direction, that is, parallel to the direction of the linear guide rail 3; Step 3: The optical imaging system 5 takes a picture of the first weld seam to acquire an image; if the weld seam is too long and exceeds the field of view, the optical imaging system 5 is controlled to move along the linear guide rail 3; a complete image of the weld seam is acquired by stitching together the images. Step 4: The software, based on image processing and AI learning technology, completes the inspection of the laser weld seam, including the size, spacing, position, and appearance quality of the laser weld points. Step 5: Rotate the rotary table 4 to rotate the second weld of the circular component to be tested to the zero position; repeat steps 3 to 4 to complete the inspection of this weld. Step 6: Repeat steps 3 to 4 until all welds in the radial direction have been inspected, and issue a complete laser spot welding quality inspection report.

[0029] This invention solves the problems of low efficiency and poor consistency in appearance quality inspection of existing manual measurement methods. Compared with manual measurement, the measurement process is highly automated and the measurement results are more accurate. It effectively improves the measurement efficiency of welding quality of core components of hydrodynamic bearings and has high industrial application value.

[0030] It should be noted that the above embodiments are merely illustrative examples of the present invention, intended to help understand the technical solution and core ideas of the present invention. Those skilled in the art should understand that any modifications, equivalent substitutions, or improvements made based on the concept of the present invention without departing from its principles should be considered within the scope of protection of the present invention, and the specific scope of protection is determined by the claims.

Claims

1. A device for automatic detection of radial laser spot welding of a circular assembly, characterized in that, The system includes a base on which a rotating platform is mounted for mounting a circular component to be tested. The rotating platform can drive the circular component to be tested to rotate. The base also includes a column support with linear guide rails at the top and bottom. An optical imaging system is slidably mounted on the linear guide rails.

2. The circular assembly radial laser spot welding automatic detection device according to claim 1, characterized in that, It also includes a calibration device, which is set on a rotating stage, and the circular component to be tested is set on the calibration device.

3. The circular assembly radial laser spot welding automatic detection device according to claim 2, characterized in that, The calibration device is concentrically positioned on the rotary table and is mounted on the rotary table via vacuum adsorption.

4. The circular assembly radial laser spot welding automatic detection device according to claim 2, characterized in that, The calibration device is equipped with a dot for calibration.

5. The circular assembly radial laser spot welding automatic detection apparatus according to claim 1, wherein, The optical imaging system includes an optical camera, a lens, and an illumination device.

6. The circular assembly radial laser spot welding automatic inspection apparatus according to claim 1, wherein, It also includes an electrical control cabinet, which is connected to the rotary table and drives the rotary table to rotate. The electrical control cabinet is also connected to the optical imaging system and drives the servo motor installed at the top and bottom of the column support, which in turn drives the optical imaging system installed on the servo motor to slide on the linear guide rail.

7. The circular assembly radial laser spot welding automatic detection device according to claim 6, characterized in that, It also includes a control box, which connects to the electrical control cabinet and provides instructions to the electrical control cabinet.

8. The circular assembly radial laser spot welding automatic detection device according to claim 6, characterized in that, It also includes a display, which is connected to the control box to show the status and position of the rotary table, the status and position of the optical imaging system, and the status of the electrical control cabinet.

9. A method for automatic detection of radial laser spot welding of circular assemblies using the apparatus according to any one of claims 1 to 8, characterized in that, include: Step 1: Place the calibration device concentrically on the rotating stage to calibrate the accuracy of the optical imaging system; Step 2: Place the circular component to be tested concentrically on the rotating table, so that the first weld of the circular component to be tested is located in the zero position direction, that is, parallel to the direction of the linear guide rail; Step 3: The optical imaging system takes a picture of the first weld seam to acquire an image; if the weld seam is too long and exceeds the field of view, the optical imaging system is controlled to move along the linear guide rail; a complete image of the weld seam is acquired by stitching the images together. Step 4: The software, based on image processing and AI learning technology, completes the inspection of the laser weld seam, including the size, spacing, position, and appearance quality of the laser weld points. Step 5: Rotate the rotary table to bring the second weld of the circular component under test to the zero position; repeat steps 3 and 4 to complete the inspection of this weld. Step 6: Repeat steps 3 to 4 until all welds in the radial direction have been inspected.

Images