Laser defect detection device and method
By designing a laser defect detection device adapted to complex surfaces, and utilizing multiple laser beam paths and movable reflectors, efficient ultrasonic defect detection of complex surface products such as curved surfaces, wave surfaces, and spherical surfaces has been achieved, solving the problems of detection limitations and low efficiency in existing technologies.
Patent Information
- Application Number
- CN202610295174.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-11
- Publication Date
- 2026-05-19
AI Technical Summary
Existing laser ultrasonic testing devices cannot effectively test complex surface products such as curved surfaces, wave surfaces, and spherical surfaces, and their testing efficiency is low.
A laser defect detection device was designed, including a machine base, a clamping module, a laser generating module, and a detection module. Through multiple laser optical paths and movable reflectors, it can be adapted to complex surface products, ensuring that the incident direction of the laser beam is perpendicular to the tangential direction, and realizing multi-face, double-face, single-face, or misalignment detection.
It expands the application scenarios of laser defect detection, enabling efficient detection of ultrasonic defects in complex surface products such as curved surfaces, wave surfaces, and spheres, thus improving detection accuracy and efficiency.
Smart Images
Figure CN122063082A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of laser ultrasonic testing technology, and in particular to a laser defect detection device and method. Background Technology
[0002] Laser ultrasonic technology utilizes pulsed laser light to induce thermoelastic or thermo-erosive effects on the workpiece under inspection, thereby generating ultrasonic waves that propagate within the workpiece. When defects exist within the workpiece, the ultrasonic waves produce minute vibrations during propagation. High-precision detection techniques capture these signal changes, allowing for the location and quantification of the internal defects. The method of obtaining ultrasonic signals based on the principle of optical interference is a non-contact, high-precision, and non-destructive ultrasonic non-destructive testing technique with advantages such as high sensitivity and high detection bandwidth.
[0003] Currently, laser ultrasonic testing devices are typically used for defect detection in flat products. However, they cannot detect complex surface products such as curved, wavy, and spherical surfaces. In other words, the application scenarios of laser ultrasonic testing are quite limited, and the efficiency of laser ultrasonic testing is too low. Summary of the Invention
[0004] Therefore, it is necessary to provide a laser defect detection device and method to address the limitations of laser ultrasonic defect detection application scenarios and the low efficiency of defect detection.
[0005] A laser defect detection device, the laser defect detection device comprising:
[0006] Machine tool;
[0007] A clamping module is disposed on the machine base for fixing the product to be tested;
[0008] A laser generating module is disposed on the machine base and connected to multiple laser optical paths. At least two of the laser optical paths are respectively disposed on opposite sides of the clamping module. A first reflecting mirror is provided at the end of the transmission path of the laser beam emitted by the laser generating module, and the first reflecting mirror is movably disposed on the machine base.
[0009] Multiple detection modules are provided, each corresponding to one of the laser optical paths, and at least two detection modules are respectively located on opposite sides of the clamping module. The detection modules are movably mounted on the machine tool.
[0010] In one embodiment, the laser defect detection device further includes multiple optical path components connected to the laser generating module to form the laser optical path.
[0011] In one embodiment, the optical path assembly includes a mounting frame and a plurality of second reflectors. The mounting frame is disposed on the machine base, and the plurality of second reflectors are movably and spaced apart on the mounting frame along multiple axes. The laser beam emitted by the laser generating module passes through the plurality of second reflectors in sequence and forms the laser optical path with the first reflector.
[0012] In one embodiment, the optical path assembly further includes an adjustment bracket and a support frame, the adjustment bracket being movably disposed on the machine base, the support frame being movably disposed on the adjustment bracket in multiple axes, and the first reflector being movably disposed on the support frame.
[0013] In one embodiment, the detection module includes a laser interferometer and a third reflecting mirror that receives the laser beam emitted by the laser interferometer. The laser interferometer is disposed on the adjustment bracket, and the third reflecting mirror is movably disposed on the adjustment bracket.
[0014] In one embodiment, the detection module further includes a support base, which is movably disposed on the adjustment bracket, and the laser interferometer and the third reflector are both disposed on the support base.
[0015] In one embodiment, the clamping module includes a clamping bracket and a first clamping module and a second clamping module, both disposed on the clamping bracket. The clamping bracket is disposed on the machine base, and a accommodating space for accommodating the product to be tested is formed between the first clamping module and the second clamping module.
[0016] In one embodiment, the first clamping module and the second clamping module are disposed at a distance from each other on the clamping bracket;
[0017] The first clamping module includes a plurality of first clamping members and a support member. The first clamping members and the support member are both disposed on the clamping bracket. The plurality of first clamping members can move toward each other or toward each other. The support member is used to support the product to be tested.
[0018] The second clamping module includes a movable frame and a second clamping member disposed on the movable frame, the movable frame being movably disposed on the clamping bracket.
[0019] In one embodiment, the laser generating module includes a laser generator and a beam splitter connected to the laser generator, the beam splitter being used to direct the laser beam emitted by the laser generator into multiple laser optical paths respectively.
[0020] A laser defect detection method for a laser defect detection device as described in any of the above technical solutions, the laser defect detection method comprising the following steps:
[0021] The clamping module clamps the product to be tested;
[0022] The laser generating module emits a laser beam into at least one of the laser optical paths. The first reflector is adjusted to receive the laser beam emitted by the laser generating module and project it onto the surface of the product under test at a preset incident angle. The detection module is also adjusted to detect surface defects in a preset area of the product under test.
[0023] The aforementioned laser defect detection device and method involve a clamping module holding the product under test, a laser generating module emitting a laser beam into a laser optical path, which then transmits the laser beam to a first reflecting mirror. The first reflecting mirror projects the laser beam onto the surface of the product under test, generating a thermoelastic or thermo-erosive effect. A detection module then performs ultrasonic defect detection on the product. Since both the first reflecting mirror and the detection module are movable relative to the machine platform, adjustments to the first reflecting mirror and the detection module ensure that the incident direction of the laser beam from the laser generating module on the surface of the product under test remains perpendicular to the tangent direction of the laser beam's point of action, and that the position and angle of the detection point on the surface of the product under test remain constant. This adapts to ultrasonic defect detection of products with complex irregular surfaces such as curved surfaces, wave surfaces, and spherical surfaces. Furthermore, the multiple laser optical paths and multiple detection modules operate independently, enabling multi-faceted, double-faced, single-faced, or misaligned detection of the product under test, thus expanding the application scenarios of the laser defect detection device. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of the laser defect detection device provided in some embodiments.
[0025] Figure 2 This is a schematic diagram of the laser optical path provided in some embodiments.
[0026] Figure 3 This is a schematic diagram of the optical path component provided in some embodiments.
[0027] Figure 4 This is a schematic diagram of the clamping module provided in some embodiments.
[0028] Figure 5 This is a schematic diagram of the laser defect detection method provided in some embodiments.
[0029] Figure label:
[0030] 100. Laser defect detection device;
[0031] 110. Machine base; 120. Clamping module; 121. Clamping bracket; 122. First clamping module; 1221. First clamping component; 1222. Support component; 123. Second clamping module; 1231. Moving frame; 1232. Second clamping component; 124. Accommodation space; 130. Laser generating module; 131. Laser generator; 132. Beam splitter; 140. Laser optical path; 150. First reflecting mirror; 160. Detection module; 161. Laser interferometer; 162. Third reflecting mirror; 163. Support base; 170. Optical path assembly; 171. Mounting bracket; 172. Second reflecting mirror; 173. Adjustment bracket; 174. Bearing frame;
[0032] 200. Product to be tested. Detailed Implementation
[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0034] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0035] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0037] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0038] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.
[0039] The technical solutions provided by the embodiments of this application are described below with reference to the accompanying drawings.
[0040] See Figures 1-3 As shown, this application provides a laser defect detection device 100, which includes a machine base 110, a clamping module 120, a laser generating module 130, and multiple detection modules 160. The laser defect detection device 100 is used to perform ultrasonic defect detection on a product 200 under test. In this embodiment, the product 200 under test may include, but is not limited to, a curved screen.
[0041] A clamping module 120 is disposed on the machine base 110 and is used to fix the product under test 200. For example, the clamping module 120 can clamp the product under test 200 on opposite sides to fix it, adapting to clamping and fixing operations on complex irregular surfaces such as curved surfaces, wave surfaces, and spherical surfaces. Of course, the clamping module 120 can also clamp only one side of the product under test 200. This application does not limit the method in which the clamping module 120 fixes the product under test 200.
[0042] A laser generating module 130 is disposed on the machine base 110, and the laser generating module 130 is connected to multiple laser optical paths 140. At least two laser optical paths 140 are respectively disposed on opposite sides of the clamping module 120. For example, in this embodiment, there are two laser optical paths 140, and the two laser optical paths 140 are arranged along... Figure 1 The X-axis is respectively positioned on opposite sides of the clamping module 120. For example, if the two laser optical paths 140 are defined as the first laser optical path and the second laser optical path, the first laser optical path along... Figure 2 As shown, the laser beam propagates in the V1 direction, and the second laser path follows... Figure 2The transmission is shown in the V2 direction. In other feasible embodiments, the laser optical path 140 can also be three, four, or other numbers, with multiple laser optical paths 140 spaced apart along the circumferential direction of the clamping module 120. A first reflector 150 is provided at the end of the transmission path of the laser beam emitted by the laser generating module 130. The first reflector 150 is used to receive the laser beam emitted by the laser generating module 130 and project it onto the surface of the product under test 200. The high-energy pulsed laser irradiates the surface of the product under test 200, and the product under test 200 is locally and instantaneously heated and expanded / vaporized to generate a thermoelastic effect or thermal erosion effect on the surface of the product under test 200, and to excite longitudinal waves, transverse waves, surface waves and other ultrasonic waves inside the product under test 200. Multiple detection modules 160 are configured corresponding to multiple laser optical paths 140, and at least two detection modules 160 are respectively configured on opposite sides of the clamping module 120. For example, two detection modules 160 are configured corresponding to two laser optical paths 140, meaning that both opposite sides of the clamping module 120 are simultaneously provided with laser optical paths 140 and detection modules 160. The detection modules 160 are used to detect surface defects of the product under test 200. For example, if the detection module 160 emits a probe laser to irradiate the surface of the product under test 200, and ultrasonic waves are transmitted to the surface of the product under test 200, causing minute vibrations / displacements, the detection module 160 detects the vibration / displacement signals to detect surface defects of the product under test 200. Specifically, the clamping module 120 clamps the product under test 200, the laser generating module 130 emits a laser beam to the laser optical path 140, and transmits the laser beam to the first reflecting mirror 150 through the laser optical path 140. The first reflecting mirror 150 projects the laser beam onto the surface of the product under test 200 to generate a thermoelastic effect or a thermo-erosion effect on the surface of the product under test 200. The detection module 160 performs ultrasonic defect detection on the product under test 200.
[0043] The first reflector 150 and the detection module 160 are both movably mounted on the machine base 110. By adjusting the first reflector 150 and the detection module 160, it can be ensured that the incident direction of the laser beam from the laser generating module 130 on the surface of the product under test 200 is always perpendicular to the tangent direction of the laser beam action point, and that the position and angle of the detection point of the detection module 160 on the surface of the product under test 200 are constant, so as to adapt to the ultrasonic defect detection of the product under test 200 with complex irregular surfaces such as curved surfaces, wave surfaces, and spherical surfaces. Furthermore, the multiple laser optical paths 140 and multiple detection modules 160 are independent of each other, enabling multi-sided (all multiple laser optical paths 140 are turned on), double-sided (both laser optical paths 140 on opposite sides of the clamping module 120 are turned on), single-sided (one of the multiple laser optical paths 140 is turned on), or misaligned (at least two laser optical paths 140 are turned on, and the positions of the multiple laser optical paths 140 acting on the surface of the product under test 200 are different) detection, thus expanding the application scenarios of the laser defect detection device 100.
[0044] In one embodiment, see Figures 1-3 As shown, the laser defect detection device 100 also includes multiple optical path components 170. The optical path components 170 are connected to the laser generating module 130 and are used to form a laser optical path 140. Specifically, the optical path component 170 has an input end and an output end. The input end of the optical path component 170 is connected to the laser generating module 130, and the output end of the optical path component 170 is connected to the first reflector 150. The laser beam emitted by the laser generating module 130 can enter the optical path component 170 through the input end and exit the optical path component 170 through the output end. The laser beam is transmitted in the optical path component 170 and forms the laser optical path 140.
[0045] For example, the optical path component 170 can be connected to the laser generating module 130 via optical fiber. The optical fiber ensures that the laser beam is transmitted to the optical path component 170 according to a preset path. Furthermore, the high flexibility of the optical fiber allows for free design of the laser beam's output path. The optical path from the laser generating module 130 to the optical path component 170 is unaffected by environmental interference and exhibits high stability. Alternatively, a lens module can be placed between the optical path component 170 and the laser generating module 130. The laser beam emitted by the laser generating module 130 is transmitted to the output component through the lens module. Since the lens module is an external optical path, the output cost can be reduced.
[0046] Specifically, see Figures 1-3 As shown, the optical path assembly 170 includes a mounting frame 171 and a plurality of second reflectors 172. The mounting frame 171 is disposed on the machine base 110, and the plurality of second reflectors 172 are movably and spaced apart on the mounting frame 171 along multiple axes. The laser beam emitted by the laser generating module 130 passes sequentially through the plurality of second reflectors 172 and forms a laser optical path 140 with the first reflector 150. Exemplarily, as in this embodiment, see [reference needed]. Figure 2 As shown, the mounting frame 171 is a truss structure. The mounting frame 171 includes a first rod extending along the X direction, a second rod extending along the Y direction, and a third rod extending along the Z direction. The first rod, the second rod, and the third rod are all provided with second reflectors 172 that can move along their extension directions. By moving the multiple second reflectors 172 along their extension directions, the laser optical path 140 can be freely adjusted in the XYZ space, thereby improving the flexibility of the laser optical path 140 design and adapting it to the ultrasonic defect detection of the product 200 with complex irregular surfaces such as curved surfaces, wave surfaces, and spherical surfaces.
[0047] It should be noted that the specific truss structure of the mounting frame 171 can be designed according to the specific requirements of the laser optical path 140. For example, the mounting frame 171 may include any one or more combinations of a first rod extending along the X direction, a second rod extending along the Y direction, and a third rod extending along the Z direction. This application does not limit the specific structure of the mounting frame 171.
[0048] Further, see Figures 1-3 As shown, the optical path assembly 170 also includes an adjustment bracket 173 and a support frame 174. The adjustment bracket 173 is movably mounted on the machine base 110, and the support frame 174 is movably mounted on the adjustment bracket 173 along multiple axes. The first reflector 150 is movably mounted on the support frame 174, such that the first reflector 150 can tilt relative to the adjustment bracket 173. For example, as in this embodiment, see [reference needed]. Figure 1 and Figure 3 As shown, the adjustment bracket 173 is a plate-shaped structure, and a Y-axis slide rail is provided at the connection position between the adjustment bracket 173 and the machine base 110. The support frame 174 is a table-type structure to support the first reflector 150, and an X-axis, Y-axis and / or Z-axis slide rail is provided between the support frame 174 and the adjustment bracket 173. The support frame 174 can drive the first reflector 150 to move along the X-axis, Y-axis and / or Z-axis, and the first reflector 150 can move relative to the support frame 174. When the laser generating module 130 transmits the laser beam to the first reflector 150 through the laser optical path 140, the position and light emission angle of the first reflector 150 are adjusted by adjusting the movement of the support 173 relative to the machine platform 110, the movement of the support frame 174 relative to the adjustment support 173, and the movement of the first reflector 150 relative to the support frame 174. For the product under test 200 with complex irregular surfaces such as curved surfaces, wave surfaces, and spherical surfaces, this ensures that the incident direction of the laser beam projected onto the surface of the product under test 200 through the first reflector 150 is always perpendicular to the tangent direction of the laser beam's point of action. This avoids the influence of changes in the incident angle of the laser beam on the intensity of the laser beam, reduces the impact of inconsistent incident angles of the laser beam on the product under test 200, and improves the accuracy of ultrasonic defect detection on the surface of the product under test 200.
[0049] In one embodiment, see Figures 1-3 As shown, the detection module 160 includes a laser interferometer 161 and a third reflector 162. The third reflector 162 receives the laser beam emitted by the laser interferometer 161 and projects the laser beam onto the surface of the product under test 200 for ultrasonic defect detection. The laser interferometer 161 is mounted on an adjustment bracket 173, and the third reflector 162 is movably mounted on the adjustment bracket 173, allowing the third reflector 162 to tilt relative to the adjustment bracket 173. For example, see [reference needed]. Figure 3As shown, the laser interferometer 161 and the third reflecting mirror 162 can be directly mounted on the adjustment bracket 173, or indirectly mounted on the adjustment bracket 173 through other structures. When the laser beam emitted by the laser interferometer 161 is transmitted to the third reflecting mirror 162, the position and beam emission angle of the third reflecting mirror 162 are adjusted by the movement of the adjustment bracket 173 relative to the machine platform 110 and the movement of the laser interferometer 161 and the third reflecting mirror 162 relative to the adjustment bracket 173. For the product under test 200 with complex irregular surfaces such as curved surfaces, wave surfaces, and spherical surfaces, this ensures that the incident direction of the laser beam acting by the laser interferometer 161 on the surface of the product under test 200 is always perpendicular to the tangent direction of the laser beam's point of action, thereby improving the accuracy of ultrasonic defect detection on the surface of the product under test 200.
[0050] For example, the third reflector 162 can be connected to the laser interferometer 161 via an optical fiber. The optical fiber ensures that the laser beam is transmitted to the third reflector 162 along a preset path. Furthermore, the high flexibility of the optical fiber allows for free design of the laser beam's output path, ensuring that the optical path from the laser interferometer 161 to the third reflector 162 is unaffected by environmental interference and exhibits high stability. Alternatively, a lens module can be installed between the third reflector 162 and the laser interferometer 161. This lens module transmits the laser beam emitted by the laser interferometer 161 to the third reflector 162. Since the lens module is an external optical path, it reduces output costs. It should be noted that in this embodiment, both the first reflector 150 and the detection module 160 are mounted on the adjustment bracket 173, allowing the laser optical path 140 and the detection optical path of the detection module 160 to be interconnected, ensuring that ultrasonic excitation and ultrasonic defect detection on the surface of the product under test 200 are performed simultaneously.
[0051] Further, see Figures 1-3 As shown, the detection module 160 also includes a support base 163. The support base 163 is movably disposed on the adjustment bracket 173, and both the laser interferometer 161 and the third reflector 162 are disposed on the support base 163. Exemplarily, as in this embodiment, see [reference needed]. Figure 3 As shown, the support base 163 is a tabletop structure to support the laser interferometer 161 and the third reflector 162. X-axis, Y-axis and / or Z-axis slide rails are provided between the support base 163 and the adjustment bracket 173. The support base 163 can drive the laser interferometer 161 and the third reflector 162 to move along the X-axis, Y-axis and / or Z-axis, further improving the degree of freedom in the design of the detection optical path and adapting to the ultrasonic defect detection of more products 200 with different specifications.
[0052] In one embodiment, see Figure 1 and Figure 4As shown, the clamping module 120 includes a clamping bracket 121, a first clamping module 122, and a second clamping module 123. The clamping bracket 121 is mounted on the machine base 110. The first clamping module 122 and the second clamping module 123 are both mounted on the clamping bracket 121, and a receiving space 124 is formed between the first clamping module 122 and the second clamping module 123. The receiving space 124 is used to receive the product under test 200. In this way, the first clamping module 122 and the second clamping module 123 clamp the opposite sides of the product under test 200, that is, the first clamping module 122 and the second clamping module 123 perform bidirectional clamping of the product under test 200, which can improve the clamping stability of the product under test 200 and can perform clamping and fixing operations on the product under test 200 with complex irregular surfaces such as curved surfaces, wave surfaces, and spherical surfaces.
[0053] Specifically, see Figure 1 and Figure 3 As shown, the first clamping module 122 and the second clamping module 123 are spaced apart on the clamping bracket 121. For example, if the first clamping module 122 and the second clamping module 123 are arranged along... Figure 1 The Z-axis spacing shown forms an accommodating space 124 between the first clamping module 122 and the second clamping module 123. The first clamping module 122 includes multiple first clamping members 1221 and support members 1222, both mounted on a clamping bracket 121. The multiple first clamping members 1221 can move towards or away from each other, such as by sliding them on a slide rail within the clamping bracket 121. For different specifications of the product under test 200, the spacing between adjacent first clamping members 1221 can be adjusted to ensure stable clamping and fixing of the product under test 200. The support member 1222 is used to support the product under test 200. If the support member 1222 is a block structure, the support member 1222 can abut against one end of the product under test 200 to provide stable support for the product under test 200. Especially for large-sized products under test 200, it can improve the fixation stability and reliability of the product under test 200, thereby improving the reliability of the ultrasonic defect detection results of the product under test 200.
[0054] Furthermore, the second clamping module 123 includes a movable frame 1231 and a second clamping member 1232. The second clamping member 1232 is disposed on the movable frame 1231 and works in conjunction with the first clamping member 1221 to achieve bidirectional clamping of the product under test 200, thereby improving the clamping stability of the product under test 200. The movable frame 1231 is movably disposed on the clamping bracket 121, such as the movable frame 1231 being able to move along... Figure 1The device moves in the Z direction as shown. In this way, by moving the movable frame 1231 toward or away from the first clamping module 122, the size of the accommodating space 124 can be increased or decreased to accommodate clamping operations of products 200 of different specifications, thus expanding the application scenarios of the laser defect detection device 100.
[0055] In one embodiment, see Figure 1 and Figure 2 As shown, the laser generating module 130 includes a laser generator 131 and a beam splitter 132. The beam splitter 132 is connected to the laser generator 131 and is used to direct the laser beam emitted by the laser generator 131 into multiple laser optical paths 140. That is, the beam splitter 132 performs beam splitting on the laser beam emitted by the laser generator 131, so that the laser beam will be transmitted in multiple laser optical paths 140, realizing multi-face, double-face, single-face or misalignment detection of the product under test 200, and expanding the application scenarios of the laser defect detection device 100.
[0056] Additionally, see Figures 1-5 As shown, this application also provides a laser defect detection method, which includes the following steps:
[0057] Step S110: The clamping module 120 clamps the product under test 200. The clamping module 120 clamps and fixes the product under test in a bidirectional clamping manner, and the product under test 200 is a complex irregular surface product such as curved surface, wave surface, spherical surface, etc., such as the product under test 200 being a curved screen.
[0058] Step S120: The laser generating module 130 emits a laser beam to at least one laser optical path 140. The first reflecting mirror 150 is adjusted to receive the laser beam emitted by the laser generating module 130 and project it onto the surface of the product under test 200 at a preset incident angle. The detection module 160 is also adjusted to detect surface defects in a preset area of the product under test 200. Specifically, during ultrasonic defect detection of the product under test 200, the laser generating module 130 emits a laser beam to at least one laser optical path 140, which transmits the laser beam to the first reflecting mirror 150. The first reflecting mirror 150 projects the laser beam onto the surface of the product under test 200 to generate a thermoelastic or thermo-erosive effect on the surface. By adjusting the first reflecting mirror 150, it can be ensured that the incident direction of the laser beam from the laser generating module 130 on the surface of the product under test 200 remains perpendicular to the tangent direction of the laser beam's point of action. Furthermore, the laser beam emitted by the laser interferometer 161 is projected onto the surface of the product under test 200 through the third reflecting mirror 162 to perform ultrasonic defect detection on the product under test 200. By adjusting the detection module 160, the position and angle of the detection point of the detection module 160 on the surface of the product under test 200 can be kept constant to adapt to ultrasonic defect detection of complex irregular surfaces such as curved surfaces, wave surfaces, and spherical surfaces. In particular, when the laser generating module 130 selectively emits a laser beam to multiple laser optical paths 140, two laser optical paths 140 set on opposite sides of the clamping module 120, or one of the laser optical paths 140, multi-face, double-face, or single-face detection of the product under test 200 can be achieved.
[0059] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0060] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A laser defect detection device, characterized in that, The laser defect detection device includes: Machine tool; A clamping module is disposed on the machine base for fixing the product to be tested; A laser generating module is disposed on the machine base and connected to multiple laser optical paths. At least two of the laser optical paths are respectively disposed on opposite sides of the clamping module. A first reflecting mirror is provided at the end of the transmission path of the laser beam emitted by the laser generating module, and the first reflecting mirror is movably disposed on the machine base. Multiple detection modules are provided, each corresponding to one of the laser optical paths, and at least two detection modules are respectively located on opposite sides of the clamping module. The detection modules are movably mounted on the machine tool.
2. The laser defect detection device according to claim 1, characterized in that, The laser defect detection device also includes multiple optical path components, which are connected to the laser generating module to form the laser optical path.
3. The laser defect detection device according to claim 2, characterized in that, The optical path assembly includes a mounting frame and multiple second reflectors. The mounting frame is disposed on the machine base, and the multiple second reflectors are movably and spaced apart on the mounting frame. The laser beam emitted by the laser generating module passes through the multiple second reflectors in sequence and forms the laser optical path with the first reflector.
4. The laser defect detection device according to claim 3, characterized in that, The optical path assembly further includes an adjustment bracket and a support frame. The adjustment bracket is movably mounted on the machine base, and the support frame is movably mounted on the adjustment bracket along multiple axes. The first reflector is movably mounted on the support frame.
5. The laser defect detection device according to claim 4, characterized in that, The detection module includes a laser interferometer and a third reflecting mirror that receives the laser beam emitted by the laser interferometer. The laser interferometer is mounted on the adjustment bracket, and the third reflecting mirror is movably mounted on the adjustment bracket.
6. The laser defect detection device according to claim 5, characterized in that, The detection module also includes a support base, which is movably mounted on the adjustment bracket. The laser interferometer and the third reflector are both mounted on the support base.
7. The laser defect detection device according to claim 1, characterized in that, The clamping module includes a clamping bracket and a first clamping module and a second clamping module, both disposed on the clamping bracket. The clamping bracket is disposed on the machine base, and a accommodating space for accommodating the product to be tested is formed between the first clamping module and the second clamping module.
8. The laser defect detection device according to claim 7, characterized in that, The first clamping module and the second clamping module are disposed at an interval on the clamping bracket; The first clamping module includes a plurality of first clamping members and a support member. The first clamping members and the support member are both disposed on the clamping bracket. The plurality of first clamping members can move toward each other or toward each other. The support member is used to support the product to be tested. The second clamping module includes a movable frame and a second clamping member disposed on the movable frame, the movable frame being movably disposed on the clamping bracket.
9. The laser defect detection device according to claim 1, characterized in that, The laser generating module includes a laser generator and a beam splitter connected to the laser generator. The beam splitter is used to direct the laser beam emitted by the laser generator into multiple laser optical paths respectively.
10. A laser defect detection method for a laser defect detection device as described in any one of claims 1-9, characterized in that, The laser defect detection method includes the following steps: The clamping module clamps the product to be tested; The laser generating module emits a laser beam into at least one of the laser optical paths. The first reflector is adjusted to receive the laser beam emitted by the laser generating module and project it onto the surface of the product under test at a preset incident angle. The detection module is also adjusted to detect surface defects in a preset area of the product under test.