Laser calibration method, device, laser cutting equipment and medium

Abstract

The present invention relates to the field of laser calibration technology, and discloses a laser calibration method, device, laser cutting equipment, and medium. The present invention prints a 3×3 array of nine-circle calibration patterns on a metal business card on a work platform of the laser cutting equipment, and uses the laser cutting equipment to collect a nine-circle image corresponding to the nine-circle calibration pattern, wherein the nine-circle calibration pattern includes characteristic information of the nine circles in the 3×3 array. A CCD nine-point calibration is performed on the nine-circle image based on a preset image coordinate system and the characteristic information of the nine-circle calibration pattern. If the CCD nine-point calibration is successful, linear correction is performed on the metal business card. When the result value after the linear correction is less than a preset threshold, the laser calibration of the laser cutting equipment is successful. This improves the calibration accuracy of the laser cutting equipment and simplifies operation.

Description

Technical Field

[0001] The present invention relates to the field of laser processing technology, and in particular to a laser calibration method, device, laser cutting equipment and medium. Background Art

[0002] Laser cutting uses the energy released when a laser beam strikes a workpiece to melt and vaporize it, achieving the desired effect of cutting or engraving. Laser cutting equipment offers high precision, rapid cutting speed, unlimited cutting patterns, automatic layout for material savings, smooth cuts, and low processing costs. Laser cutting equipment is poised to gradually improve upon or even replace traditional metal cutting equipment.

[0003] Currently, existing camera calibration methods for laser cutting machines require capturing multiple images of a camera calibration plate of known dimensions on the laser cutting machine's work platform. However, this method is inconvenient for capturing multiple images of the calibration plate on the laser cutting machine's work platform, and the camera calibration accuracy is directly related to the accuracy of the calibration plate. This laser calibration method also suffers from the following drawbacks: Low calibration accuracy leads to reduced precision of the workpiece after laser cutting. Summary of the Invention

[0004] The main purpose of the present invention is to provide a laser calibration method, device, laser cutting equipment and medium, aiming to improve calibration accuracy and simplify operation.

[0005] To achieve the above object, the present invention provides a laser calibration method, which is applied to a laser cutting device, wherein the laser cutting device includes a laser cutting device working platform, and the laser calibration method includes the following steps:

[0006] Printing a 3×3 array of nine circles on a metal business card on a work platform of the laser cutting machine, and collecting nine circle images corresponding to the array of nine circles, wherein the nine circle calibration image includes feature information of the 3×3 array of nine circles;

[0007] Based on a preset image coordinate system and feature information of the nine-circle calibration diagram, performing CCD nine-point calibration on the nine-circle image;

[0008] If the CCD nine-point calibration is successful, the metal business card is linearly corrected;

[0009] If the result after linear correction is less than the preset threshold, the laser calibration is successful.

[0010] Preferably, before the step of performing CCD nine-point calibration on the nine-circle image based on the preset image coordinate system and the characteristic information of the nine-circle calibration diagram, the laser calibration method further comprises:

[0011] One of the circles in the nine-circle image is selected as the target positioning circle, and the center of the target positioning circle is used as the coordinate origin, the horizontal direction is the X-axis, and the vertical direction is the Y-axis to construct a preset image coordinate system, wherein the target positioning circle is the center circle of the nine-circle image.

[0012] Preferably, the CCD nine-point calibration includes marking nine points and nine-point calibration, and the step of performing CCD nine-point calibration on the nine-circle image based on the preset image coordinate system and feature information of the nine-circle calibration diagram includes:

[0013] Marking nine points on the nine-circle images according to a preset image coordinate system and the nine-circle images to obtain coordinates of the centers of the nine-circle images;

[0014] According to the characteristic information of the nine-circle calibration diagram, nine-point calibration is performed on the coordinates of the center of each circle.

[0015] Preferably, the laser cutting device includes a CCD imaging component, the CCD imaging component includes a search area and a circle finding tool, and after the step of performing CCD nine-point calibration on the nine-circle image based on a preset image coordinate system and feature information of the nine-circle calibration diagram, the laser calibration method further includes:

[0016] If the CCD nine-point calibration fails, extracting a search area and a preset number of circle-finding tools in the CCD imaging component, and framing the search area to enclose the preset number of circle-finding tools to obtain a new preset area of ​​the CCD imaging component;

[0017] The center point of the circle-finding tool in the new preset area is aligned with the centers of the nine circle images, and CCD nine-point calibration is performed.

[0018] Preferably, the linear correction includes marking a grid, measuring correction, and accuracy detection. The step of performing linear correction on the metal business card includes:

[0019] Punching a mark grid of a preset format on the metal business card to obtain a linear grid;

[0020] Performing measurement correction on each grid in the linear grid;

[0021] If the measurement and calibration are successful, the metal business card on the working platform of the laser cutting equipment is replaced, and a marking grid of a preset format is punched on the new metal business card to obtain a new marking grid;

[0022] Performing accuracy testing on the newly marked grid;

[0023] If the accuracy test result is less than the preset threshold, the laser calibration is successful and the linear correction is exited.

[0024] Preferably, the laser cutting device includes a CCD imaging component, the CCD imaging component includes a search area, and after the step of measuring and correcting each grid in the linear grid, the laser calibration method further includes:

[0025] If the measurement calibration fails, the position of the search area in the CCD imaging assembly is adjusted.

[0026] Preferably, after the step of performing accuracy detection on the new marking grid, the laser calibration method further comprises:

[0027] If the accuracy test result is greater than or equal to the preset threshold, the process returns to perform CCD nine-point calibration.

[0028] In addition, to achieve the above-mentioned purpose, the present invention further provides a laser calibration device, which includes:

[0029] an acquisition module, configured to print a 3×3 array of nine-circle calibration patterns on a metal business card on a work platform of a laser cutting device, and to acquire nine-circle images corresponding to the nine-circle calibration patterns, wherein the nine-circle calibration patterns include feature information of the 3×3 array of nine circles;

[0030] A nine-point calibration module, configured to perform a nine-point CCD calibration on the nine-circle image based on a preset image coordinate system and feature information of the nine-circle calibration graph;

[0031] A correction module, configured to perform linear correction on the metal business card if the nine-point calibration of the CCD is successful;

[0032] The linear module is used to determine that the laser calibration is successful if the result after linear correction is less than a preset threshold.

[0033] In addition, to achieve the above-mentioned purpose, the present invention also provides a laser cutting device, which includes: a memory, a processor, and a laser calibration program stored in the memory and runnable on the processor. When the laser calibration program is executed by the processor, the steps of the laser calibration method described above are implemented.

[0034] In addition, to achieve the above-mentioned purpose, the present invention also provides a medium, which is a computer-readable storage medium, and a laser calibration program is stored on the computer-readable storage medium. When the laser calibration program is executed by the processor, the steps of the laser calibration method described above are implemented.

[0035] The laser calibration method, device, laser equipment and medium proposed in the present invention print a 3×3 array-shaped nine-circle calibration diagram on a metal business card on the work platform of the laser cutting equipment, and collect a nine-circle image corresponding to the nine-circle calibration diagram, wherein the nine-circle calibration diagram includes characteristic information of the nine circles in the 3×3 array; based on a preset image coordinate system and the characteristic information of the nine-circle calibration diagram, the nine-circle image is subjected to a CCD nine-point calibration; if the CCD nine-point calibration is successful, the metal business card is linearly corrected; if the result after the linear correction is less than a preset threshold, the laser calibration is successful. The present invention prints a 3×3 array-shaped nine-circle calibration diagram on a metal business card on a working platform of a laser cutting device, and uses the laser cutting device to collect a nine-circle image corresponding to the nine-circle calibration diagram, wherein the nine-circle calibration diagram includes characteristic information of the nine circles in the 3×3 array. According to a preset image coordinate system and the characteristic information of the nine-circle calibration diagram, a CCD nine-point calibration is performed on the nine-circle image. If the CCD nine-point calibration is successful, a linear correction is performed on the metal business card. When the result value after the linear correction is less than a preset threshold value, the laser calibration of the laser cutting device is successful. This improves the calibration accuracy of the laser cutting device and simplifies the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the device structure of the hardware operating environment involved in the embodiment of the present invention;

[0037] Figure 2 This is a schematic flow chart of a first embodiment of the laser calibration method of the present invention;

[0038] Figure 3 A schematic diagram of a portion of the internal structure of a laser cutting device according to a first embodiment of the laser calibration method of the present invention;

[0039] Figure 4 Schematic diagram of the process of the second embodiment of the laser calibration method of the present invention;

[0040] Figure 5 Schematic diagram of the process of the third embodiment of the laser calibration method of the present invention;

[0041] Figure 6 Schematic diagram of the process of the fourth embodiment of the laser calibration method of the present invention;

[0042] Figure 7 Schematic diagram of the process of the fifth embodiment of the laser calibration method of the present invention;

[0043] Figure 8 This is a schematic diagram of the first sub-process of the fifth embodiment of the laser calibration method of the present invention;

[0044] Figure 9 This is a schematic diagram of the second sub-process of the fifth embodiment of the laser calibration method of the present invention;

[0045] Figure 10 Schematic diagram of the functional modules of the first embodiment of the laser marking device of the present invention.

[0046] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0047] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0048] like Figure 1 As shown, Figure 1 It is a schematic diagram of the device structure of the hardware operating environment involved in the embodiment of the present invention.

[0049] The device in the embodiment of the present invention may be a laser cutting device.

[0050] like Figure 1 As shown, the device may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0051] Those skilled in the art will understand that Figure 1 The device structure shown in the figure does not constitute a limitation of the device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0052] like Figure 1 As shown, the memory 1005 as a computer storage medium may include an operating system, a network communication module, a user interface module, and a laser calibration program.

[0053] Among them, the operating system is a program that manages and controls laser calibration equipment and software resources, and supports the operation of network communication module, user interface module, laser calibration program and other programs or software; the network communication module is used to manage and control network interface 1002; the user interface module is used to manage and control user interface 1003.

[0054] exist Figure 1 In the laser cutting device shown, the laser cutting device calls the laser calibration program stored in the memory 1005 through the processor 1001 and executes the operations in each embodiment of the following laser calibration method.

[0055] Based on the above hardware structure, an embodiment of the laser calibration method of the present invention is proposed.

[0056] Reference Figure 2 , Figure 2 FIG1 is a flow chart of a first embodiment of a laser calibration method according to the present invention, wherein the laser calibration method comprises:

[0057] Step S10: Printing a 3×3 array of nine-circle calibration patterns on a metal business card on a work platform of the laser cutting device, and collecting nine-circle images corresponding to the nine-circle calibration patterns, wherein the nine-circle calibration patterns include feature information of the 3×3 array of nine circles;

[0058] Step S20, performing CCD nine-point calibration on the nine-circle image based on a preset image coordinate system and feature information of the nine-circle calibration image;

[0059] Step S30: If the CCD nine-point calibration is successful, linear correction is performed on the metal business card;

[0060] In step S40 , if the result after linear correction is less than a preset threshold, the laser calibration is successful.

[0061] This embodiment prints a 3×3 array-shaped nine-circle calibration diagram on a metal business card on a working platform of a laser cutting device, and uses the laser cutting device to collect a nine-circle image corresponding to the nine-circle calibration diagram, wherein the nine-circle calibration diagram includes characteristic information of the nine circles in the 3×3 array. According to a preset image coordinate system and the characteristic information of the nine-circle calibration diagram, a CCD nine-point calibration is performed on the nine-circle image. If the CCD nine-point calibration is successful, a linear correction is performed on the metal business card. When the result value after the linear correction is less than a preset threshold value, the laser calibration of the laser cutting device is successful. This improves the calibration accuracy of the laser cutting device and simplifies the operation.

[0062] The following describes each step in detail:

[0063] Step S10: Print a 3×3 array of nine-circle calibration diagram on the metal business card of the laser cutting equipment work platform, and collect nine-circle images corresponding to the nine-circle calibration diagram, wherein the nine-circle calibration diagram includes feature information of the 3×3 array of nine circles.

[0064] In this embodiment, the laser calibration method of the present invention is applied to laser cutting equipment, wherein the laser cutting equipment includes but is not limited to: CCD imaging component, laser cutting equipment working platform, laser, etc. wherein the CCD imaging component is installed above the laser cutting equipment. Figure 3 , Figure 3 This is a schematic diagram of part of the internal structure of the laser cutting equipment (conveyor line and jig positioning components), which includes but is not limited to: calibration substrate 001, product jig 002, PCB board 003, blocking sensor 004, blocking lifting cylinder 005, lower pressure plate 006, lower pressure cylinder 007, width adjustment sliding guide rail 008, lower dust collection chamber 009, bottom plate 010, manual clamping handle 011, power meter 012, conveying motor 013, feed and discharge sensor 014, conveyor belt 015 and lower dust extraction connection port 016.

[0065] First, a 3×3 array of nine-circle calibration patterns is printed on a metal business card on the laser cutting machine's work surface. The nine-circle calibration pattern includes characteristic information for the nine circles in the 3×3 array, including their position and size. Preferably, the circles in the nine-circle calibration pattern have a diameter of 1.5 mm, with a row spacing of 2 mm and a column spacing of 2 mm. The characteristic information of the nine-circle calibration pattern can be customized based on actual conditions.

[0066] The nine-circle image corresponding to the nine-circle calibration diagram on the metal business card is collected by the CCD imaging component of the laser cutting equipment.

[0067] Before collecting the nine-circle images corresponding to the nine-circle calibration diagram, the CCD imaging component needs to be set and adjusted so that the image collected by the adjusted CCD imaging component is consistent with the actual situation.

[0068] First, place a marker (such as a piece of paper with text on it, so as to determine the field of view coordinates) under the field lens of the CCD imaging component, then continuously capture the marker, rotate the focus knob of the CCD imaging component, and roughly adjust the focus until the marker in the scene can be seen.

[0069] Change the rotation in "Rotation Mirror Mode" to "0 degrees" and the mirror image to horizontal so that the image is consistent with the actual situation. If it does not match the actual situation, loosen the lens fixing parts and rotate the lens and camera to match the actual situation.

[0070] Step S20 , performing CCD nine-point calibration on the nine-circle image based on a preset image coordinate system and feature information of the nine-circle calibration image.

[0071] In this embodiment, based on the characteristic information of the above-mentioned nine-circle calibration diagram and the preset image coordinate system, the coordinate values ​​of the nine-circle centers of the nine-circle image in the preset image coordinate system are determined; and based on the coordinate values ​​of the nine-circle centers, the nine-circle image is subjected to CCD nine-point calibration; wherein, the preset image coordinate system is preferably the CCD imaging component coordinate system of the laser cutting equipment.

[0072] Output the CCD nine-point calibration result. When the tolerance of the CCD nine-point calibration result of the nine-circle image is within the preset range, the CCD nine-point calibration is successful. If the tolerance of the CCD nine-point calibration result is greater than the preset value, the CCD nine-point calibration fails, and the imaging template of the CCD imaging component needs to be modified. The tolerance is the difference between the feature information in the nine-point calibration image and the feature information in the nine-circle image, and the tolerance is preferably 0.005mm.

[0073] Step S30: If the CCD nine-point calibration is successful, linear correction is performed on the metal business card.

[0074] In one embodiment, when the nine-point calibration is successful, the metal business card is linearly corrected. The metal business card is moved to a suitable position by the working platform of the laser cutting equipment, and laser dots (11×11 dots) are punched on the metal business card to obtain a linear grid. It should be noted that it is necessary to ensure that the dots are completely printed on the metal business card. Linear correction operations such as measurement correction and accuracy detection are performed on the linear grid, thereby achieving accuracy compensation for the coordinates of each point on the metal business card after dotting, thereby improving the accuracy of laser calibration.

[0075] In step S40 , if the result after linear correction is less than a preset threshold, the laser calibration is successful.

[0076] In this embodiment, when the linearity correction result is less than a preset threshold, the laser calibration of the laser cutting device is successful and completed. The preset threshold is preferably ±0.01 mm. This improves the calibration accuracy of the laser cutting device and simplifies the operation, thereby improving the accuracy of the workpiece after laser cutting.

[0077] This embodiment prints a 3×3 array-shaped nine-circle calibration diagram on a metal business card on a working platform of a laser cutting device, and uses the laser cutting device to collect a nine-circle image corresponding to the nine-circle calibration diagram, wherein the nine-circle calibration diagram includes characteristic information of the nine circles in the 3×3 array. According to a preset image coordinate system and the characteristic information of the nine-circle calibration diagram, a CCD nine-point calibration is performed on the nine-circle image. If the CCD nine-point calibration is successful, a linear correction is performed on the metal business card. When the result value after the linear correction is less than a preset threshold value, the laser calibration of the laser cutting device is successful. This improves the calibration accuracy of the laser cutting device and simplifies the operation.

[0078] Furthermore, based on the first embodiment of the laser calibration method of the present invention, a second embodiment of the laser calibration method is proposed.

[0079] The difference between the second embodiment of the laser calibration method and the first embodiment of the laser calibration method is that in this embodiment, before the step S10 of performing CCD nine-point calibration on the nine-circle image based on the preset image coordinate system and the characteristic information of the nine-circle calibration diagram, referring to Figure 4 , the laser calibration method further includes:

[0080] Step A10: Select one of the circles from the nine-circle images as the target positioning circle, and construct a preset image coordinate system with the center of the target positioning circle as the coordinate origin, the horizontal direction as the X-axis, and the vertical direction as the Y-axis, wherein the target positioning circle is the center circle of the nine-circle image.

[0081] In this embodiment, before performing CCD nine-point calibration on the nine-circle image based on the preset image coordinate system and the characteristic information of the nine-circle calibration diagram, one of the circles is selected from the nine-circle image as the target positioning circle, and the center of the target positioning circle is used as the coordinate origin, the horizontal direction is the X-axis, and the vertical direction is the Y-axis to construct an image coordinate system; thereby improving the calibration accuracy during the laser calibration process.

[0082] The following describes each step in detail:

[0083] Step A10: Select one of the circles from the nine-circle images as the target positioning circle, and construct a preset image coordinate system with the center of the target positioning circle as the coordinate origin, the horizontal direction as the X-axis, and the vertical direction as the Y-axis, wherein the target positioning circle is the center circle of the nine-circle image.

[0084] In this embodiment, the laser cutting device includes a CCD imaging component, which is arranged above the working platform of the laser cutting device; the image of the metal business card on the laser cutting device is obtained through the CCD imaging component.

[0085] Before performing the CCD nine-point calibration on the nine-circle image based on the preset image coordinate system and the characteristic information of the nine-circle calibration diagram, it is also necessary to pre-set the image coordinate system of the CCD imaging component; select one of the circles from the nine-circle image as the target positioning circle, and construct an image coordinate system with the center of the target positioning circle as the coordinate origin, the horizontal direction as the X-axis, and the vertical direction as the Y-axis; the target positioning circle is preferably the center circle of the nine-circle image; thereby improving the calibration accuracy during the laser calibration process.

[0086] Furthermore, according to the characteristic information of the nine-circle calibration image and the image coordinate system, the coordinate value of the center of each circle in the nine-circle image in the image coordinate system can be determined.

[0087] In addition, any circle in the nine circle images can be selected as the target positioning circle, and the center of the circle is used as the coordinate origin, the horizontal direction is the X-axis, and the vertical direction is the Y-axis to construct a preset image coordinate system.

[0088] In this embodiment, before performing CCD nine-point calibration on the nine-circle image based on the preset image coordinate system and the characteristic information of the nine-circle calibration diagram, one of the circles is selected from the nine-circle image as the target positioning circle, and the center of the target positioning circle is used as the coordinate origin, the horizontal direction is the X-axis, and the vertical direction is the Y-axis to construct an image coordinate system; thereby improving the calibration accuracy during the laser calibration process.

[0089] Furthermore, based on the first and second embodiments of the laser calibration method of the present invention, a third embodiment of the laser calibration method of the present invention is proposed.

[0090] The difference between the third embodiment of the laser calibration method and the first and second embodiments of the laser calibration method is that the third embodiment refines the step S20, based on the preset image coordinate system and the characteristic information of the nine-circle calibration diagram, to perform the CCD nine-point calibration on the nine-circle image. Figure 5 , this step specifically includes:

[0091] Step S21, marking nine points on the nine-circle image according to a preset image coordinate system and the nine-circle image to obtain the coordinates of the centers of the nine-circle images;

[0092] Step S22: performing nine-point calibration on the center coordinates of each circle according to the characteristic information of the nine-circle calibration diagram.

[0093] In this embodiment, nine points are marked on the nine-circle image according to the nine-circle image and the preset image coordinate system to obtain the coordinates of the center of each circle of the nine-circle image; and nine-point calibration is performed on each center coordinate according to the characteristic information of the nine-circle calibration diagram, thereby improving the accuracy of laser calibration.

[0094] The following describes each step in detail:

[0095] Step S21 : Mark nine points on the nine-circle image according to a preset image coordinate system and the nine-circle image to obtain the coordinates of the centers of the nine-circle images.

[0096] In this embodiment, the CCD nine-point calibration includes marking nine points and nine-point calibration; according to the nine-circle image and the preset image coordinate system, the nine points of the nine-circle image are marked, and the distances between the nine-circle center points of the nine-circle image and the X-axis and Y-axis of the preset image coordinate system are calculated; through the distances between the X-axis and the Y-axis, the coordinates of the centers of each circle of the nine-circle image in the preset image coordinate system are determined; thereby ensuring the stability of the accuracy of the data measurement of the nine-circle calibration diagram.

[0097] Step S21 : performing nine-point calibration on the center coordinates of each circle according to the characteristic information of the nine-circle calibration diagram.

[0098] In this embodiment, a nine-point calibration is performed on the center coordinates of each circle obtained above based on the characteristic information of the nine-circle calibration diagram to determine the circle diameter, spacing X, and spacing Y of each circle. The characteristic information includes information about the circle's position and size. Preferably, the circle diameter of the nine-circle calibration diagram is 1.5 mm, the row spacing X is 2 mm, and the column spacing Y is 2 mm. The characteristic information of the nine-circle calibration diagram can be adjusted based on actual conditions.

[0099] Furthermore, the calibration tolerance between the characteristic information of the nine-circle calibration diagram and the circle diameter, spacing X and spacing Y of each circle in the nine-circle image is detected. When the calibration tolerance is less than or equal to the preset tolerance, the CCD nine-point calibration is successful; when the calibration tolerance is greater than the preset tolerance, the CCD nine-point calibration fails; wherein the calibration tolerance is the difference between the circle diameter, spacing X and spacing Y of each circle in the nine-circle calibration diagram and the nine-circle image.

[0100] The preset tolerance is the difference between the circle diameter, the spacing X, and the spacing Y of each circle in the preset nine-circle calibration diagram and the nine-circle image, and the preset tolerance is preferably 0.01 mm.

[0101] In this embodiment, nine points are marked on the nine-circle image according to the nine-circle image and the preset image coordinate system to obtain the coordinates of the center of each circle of the nine-circle image; and nine-point calibration is performed on each center coordinate according to the characteristic information of the nine-circle calibration diagram, thereby improving the accuracy of laser calibration.

[0102] Furthermore, based on the first, second and third embodiments of the laser calibration method of the present invention, a fourth embodiment of the laser calibration method of the present invention is proposed.

[0103] The fourth embodiment of the laser calibration method is different from the first, second and third embodiments of the laser calibration method in that the fourth embodiment is to perform a CCD nine-point calibration on the nine-circle image based on the preset image coordinate system and the characteristic information of the nine-circle calibration diagram in step S20, and then refer to Figure 6 , the laser calibration method further includes:

[0104] Step B10: If the CCD nine-point calibration fails, extracting a search area and a preset number of circle-finding tools in the CCD imaging component, and framing the search area to encompass the preset number of circle-finding tools to obtain a new preset area of ​​the CCD imaging component;

[0105] Step B20: aligning the center point of the circle-finding tool in the new preset area with the centers of the nine circle images, and performing CCD nine-point calibration.

[0106] In this embodiment, when the CCD nine-point calibration fails, the search area and a preset number of circle-finding tools in the CCD imaging component are extracted, and the search area is framed by the preset number of circle-finding tools to obtain a new preset area of ​​the CCD imaging component; the center point of the circle-finding tool in the new preset area is aligned with the center of each circle of the nine-circle image, and the CCD nine-point calibration is performed; thereby solving the problem of calibration failure caused by the difference in imaging between the preset area of ​​the CCD imaging component and the nine-circle image, and simplifying the operation of laser calibration.

[0107] The following describes each step in detail:

[0108] Step B10: If the CCD nine-point calibration fails, extract the search area and a preset number of circle-finding tools in the CCD imaging component, and frame the preset number of circle-finding tools with the search area to obtain a new preset area of ​​the CCD imaging component.

[0109] In this embodiment, the CCD imaging component includes a search area, a circle finding tool and a CCD project; the search area and the circle finding tool can adjust the preset area of ​​the CCD imaging component, which is the imaging area of ​​the CCD imaging component; the CCD project can implement the nine-point calibration process of the CCD imaging component, adjust the basic parameters of the nine-point calibration, and obtain the reasons for the failure of the CCD nine-point calibration, etc.

[0110] When the CCD nine-point calibration fails, the reason for the failure is obtained from the CCD project of the CCD imaging component. It is found that the reason for the failure is that the preset area of ​​the CCD imaging component is different from the actual imaging area of ​​the nine-circle image, resulting in the inability to capture the nine-circle image and causing the CCD nine-point calibration to fail.

[0111] After obtaining the reason for the failure of the CCD nine-point calibration, the search area and a preset number of circle-finding tools in the CCD imaging component are extracted, and the search area is framed by the preset number of circle-finding tools to obtain a new preset area of ​​the CCD imaging component; wherein the preset number is preferably 9.

[0112] Step B20: aligning the center point of the circle-finding tool in the new preset area with the centers of the nine circle images, and performing CCD nine-point calibration.

[0113] In this embodiment, the center point of the circle-finding tool in the newly preset area is aligned with the center of each circle in the nine-circle image, and a nine-point CCD calibration is performed. The CCD nine-point calibration result is output. After the nine-point CCD calibration step, the next step is executed: if the nine-point CCD calibration is successful, linear correction is performed on the metal business card.

[0114] In this embodiment, when the CCD nine-point calibration fails, the search area and a preset number of circle-finding tools in the CCD imaging component are extracted, and the search area is framed by the preset number of circle-finding tools to obtain a new preset area of ​​the CCD imaging component; the center point of the circle-finding tool in the new preset area is aligned with the center of each circle of the nine-circle image, and the CCD nine-point calibration is performed; thereby solving the problem of calibration failure caused by the difference in imaging between the preset area of ​​the CCD imaging component and the nine-circle image, and simplifying the operation of laser calibration.

[0115] Furthermore, based on the first, second, third and fourth embodiments of the laser calibration method of the present invention, a fifth embodiment of the laser calibration method of the present invention is proposed.

[0116] The fifth embodiment of the laser calibration method is different from the first, second, third and fourth embodiments of the laser calibration method in that this embodiment is a refinement of step S30, which performs linear correction on the metal business card. Figure 7 , this step specifically includes:

[0117] Step S31, marking a preset format mark grid on the metal business card to obtain a linear grid;

[0118] Step S32, measuring and correcting each grid in the linear grid;

[0119] Step S33: If the measurement and calibration are successful, the metal business card on the working platform of the laser cutting equipment is replaced, and a marking grid of a preset format is printed on the new metal business card to obtain a new marking grid;

[0120] Step S34, performing accuracy detection on the newly marked grid;

[0121] Step S35: If the accuracy detection result is less than the preset threshold, the laser calibration is successful and the linear calibration is exited.

[0122] In this embodiment, a linear grid is obtained by punching a marking grid of a preset format on a metal business card; each grid in the linear grid is measured and corrected; when the measurement and correction is successful, the metal business card on the work platform of the laser cutting equipment is replaced, and a marking grid of a preset format is punched on the new metal business card to obtain a new marking grid; the new marking grid is precision-checked; when the precision check result is less than a preset threshold, the linear correction is successful and the linear correction is exited; the coordinates of each point in the nine-circle image are compensated through the linear correction, thereby improving the accuracy of the laser calibration.

[0123] The following describes each step in detail:

[0124] Step S31 : Printing a mark grid of a preset format on the metal business card to obtain a linear grid.

[0125] In this embodiment, linear correction includes grid marking, measurement correction, and accuracy testing. The metal business card is moved to the appropriate position using the laser cutting equipment work platform, and laser dots (11×11 dots) are then applied to the metal business card using the laser cutting equipment. This is done by marking a grid (11×11 dots) on the metal business card, ensuring that the 11×11 dots are fully printed onto the metal business card, resulting in a corresponding linear grid.

[0126] Step S32: performing measurement correction on each grid in the linear grid.

[0127] In this embodiment, measurement and calibration are performed on each grid in the linear grid. The CCD imaging component sequentially captures the printed marking grid and measures the calibration position. The calibration position is used to determine whether the measurement and calibration is successful. If the measurement and calibration is successful, the next step is executed. If the measurement and calibration fails, the position of the search area in the CCD imaging component needs to be adjusted so that the adjusted search area matches the actual situation of the nine-circle calibration diagram.

[0128] Further, refer to Figure 8 After step S32, the laser calibration method further includes:

[0129] Step C10: If the measurement calibration fails, adjust the position of the search area in the CCD imaging component.

[0130] In this embodiment, when the measurement calibration fails, it is necessary to adjust the position of the search area in the CCD imaging component so that the adjusted search area is consistent with the actual situation of the nine-circle image.

[0131] Step S33: If the measurement and calibration are successful, the metal business card on the working platform of the laser cutting equipment is replaced, and a marking grid of a preset format is printed on the new metal business card to obtain a new marking grid.

[0132] In this embodiment, when the measurement and calibration are successful, the metal business card on the work platform of the laser cutting equipment is replaced and the grid is marked on the new metal business card to obtain a new marked grid. At this point, the marked grid by the laser has been calibrated, and the next step of the linear calibration operation is carried out.

[0133] Step S34: performing accuracy detection on the newly marked grid.

[0134] In this embodiment, the newly marked grid is precision-checked by the CCD imaging component to obtain a precision check result. The precision check result is then compared with a preset threshold. When the precision check result is greater than or equal to the preset threshold, the CCD nine-point calibration is performed. When the precision check result is less than the preset threshold, the laser calibration of the laser cutting device is successful, the laser calibration is completed, and the laser calibration is exited. The preset threshold is preferably plus or minus 0.01 mm.

[0135] Further, refer to Figure 9 After step S34, the laser calibration method further includes:

[0136] Step D10: If the accuracy detection result is greater than or equal to the preset threshold, the process returns to perform CCD nine-point calibration.

[0137] In this embodiment, when the accuracy test result is greater than or equal to a preset threshold, it is necessary to recheck whether the focus captured by the CCD imaging component is accurate, and then return to perform the CCD nine-point calibration operation and adjust the CCD imaging component. Among them, the preset threshold is preferably ±0.01mm.

[0138] Step S35: If the accuracy detection result is less than the preset threshold, the laser calibration is successful and the linear calibration is exited.

[0139] In this embodiment, when the accuracy test result is less than a preset threshold, the laser calibration of the laser cutting device is successful, the laser calibration operation is completed, and the linearity correction is exited. This improves the calibration accuracy of the laser cutting device and simplifies the operation, thereby improving the accuracy of the workpiece after laser cutting.

[0140] In this embodiment, a marking grid of a preset format is punched on a metal business card to obtain a linear grid; each grid in the linear grid is measured and corrected; when the measurement and correction is successful, the metal business card on the work platform of the laser cutting equipment is replaced, and a marking grid of a preset format is punched on the new metal business card to obtain a new marking grid; the new marking grid is precision-checked; when the precision check result is less than a preset threshold, the linear correction is successful and the linear correction is exited; the coordinates of each point in the nine-circle image are compensated through the linear correction, thereby improving the accuracy of the laser calibration.

[0141] The present invention also provides a laser calibration device. Figure 10 , the laser calibration device of the present invention comprises:

[0142] The acquisition module 10 is configured to print a 3×3 array of nine-circle calibration patterns on a metal business card on a work platform of a laser cutting device, and to acquire nine-circle images corresponding to the nine-circle calibration patterns, wherein the nine-circle calibration patterns include characteristic information of the 3×3 array of nine circles;

[0143] A nine-point calibration module 20 is configured to perform a CCD nine-point calibration on the nine-circle image based on a preset image coordinate system and feature information of the nine-circle calibration graph;

[0144] A correction module 30 is configured to perform linear correction on the metal business card if the nine-point calibration of the CCD is successful;

[0145] The linear module 40 is used to determine that the laser calibration is successful if the result after linear correction is less than a preset threshold.

[0146] In addition, the present invention also provides a medium, which is a computer-readable storage medium and stores a laser calibration program. When the laser calibration program is executed by a processor, the steps of the laser calibration method described above are implemented.

[0147] The method implemented when the laser calibration program running on the processor is executed can refer to the various embodiments of the laser calibration method of the present invention, and will not be described in detail here.

[0148] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0149] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0150] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0151] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A laser calibration method, characterized in that: The laser calibration method is applied to a laser cutting device, wherein the laser cutting device includes a CCD imaging component and a laser cutting device working platform. The laser calibration method includes the following steps: Adjusting the CCD imaging component so that the image captured by the adjusted CCD imaging component is consistent with the actual situation; Printing a 3×3 array of nine-circle calibration patterns on a metal business card on a work platform of the laser cutting device, and collecting nine-circle images corresponding to the nine-circle calibration patterns, wherein the nine-circle calibration patterns include feature information of the 3×3 array of nine circles; Based on a preset image coordinate system and feature information of the nine-circle calibration diagram, performing CCD nine-point calibration on the nine-circle image, and outputting a CCD nine-point calibration result, the preset image coordinate system including the CCD imaging component coordinate system of the laser cutting device; If the tolerance of the CCD nine-point calibration result is within a preset range, the CCD nine-point calibration is successful; If the tolerance of the CCD nine-point calibration result is greater than a preset value, the CCD nine-point calibration fails, and the imaging template of the CCD imaging component is modified; If the CCD nine-point calibration is successful, linear correction is performed on the metal business card; If the result after linear correction is less than the preset threshold, the laser calibration is successful; Before the step of performing CCD nine-point calibration on the nine-circle image based on the preset image coordinate system and the characteristic information of the nine-circle calibration diagram, the laser calibration method further includes: Select one of the circles from the nine-circle image as the target positioning circle, and construct a preset image coordinate system with the center of the target positioning circle as the coordinate origin, the horizontal direction as the X-axis, and the vertical direction as the Y-axis, wherein the target positioning circle is the center circle of the nine-circle image; The CCD imaging assembly includes a search area and a circle finding tool. After the step of performing CCD nine-point calibration on the nine-circle image based on a preset image coordinate system and feature information of the nine-circle calibration diagram, the laser calibration method further includes: If the CCD nine-point calibration fails, extracting a search area and a preset number of circle-finding tools in the CCD imaging component, and framing the search area to enclose the preset number of circle-finding tools to obtain a new preset area of ​​the CCD imaging component; The center point of the circle-finding tool in the new preset area is aligned with the centers of the nine circle images, and CCD nine-point calibration is performed.

2. The laser calibration method according to claim 1, wherein: The CCD nine-point calibration includes marking nine points and nine-point calibration. The step of performing CCD nine-point calibration on the nine-circle image based on the preset image coordinate system and the feature information of the nine-circle calibration diagram includes: Marking nine points on the nine-circle images according to a preset image coordinate system and the nine-circle images to obtain coordinates of the centers of the nine-circle images; According to the characteristic information of the nine-circle calibration diagram, nine-point calibration is performed on the coordinates of the center of each circle.

3. The laser calibration method according to claim 1, wherein: The linear correction includes marking the grid, measuring and correcting, and accuracy detection. The steps of performing linear correction on the metal business card include: Punching a mark grid of a preset format on the metal business card to obtain a linear grid; Performing measurement correction on each grid in the linear grid; If the measurement and calibration are successful, the metal business card on the working platform of the laser cutting equipment is replaced, and a marking grid of a preset format is punched out on the new metal business card to obtain a new marking grid; Performing accuracy testing on the newly marked grid; If the accuracy test result is less than the preset threshold, the laser calibration is successful and the linear correction is exited.

4. The laser calibration method according to claim 3, wherein: The laser cutting device includes a CCD imaging component, the CCD imaging component includes a search area, and after the step of measuring and correcting each grid in the linear grid, the laser calibration method further includes: If the measurement calibration fails, the position of the search area in the CCD imaging assembly is adjusted.

5. The laser calibration method according to claim 3, wherein: After the step of performing accuracy detection on the new marking grid, the laser calibration method further comprises: If the accuracy test result is greater than or equal to the preset threshold, the process returns to perform CCD nine-point calibration.

6. A laser calibration device, characterized in that: The laser calibration device is provided on a laser cutting device, the laser cutting device includes a CCD imaging component, and the laser calibration device includes: an acquisition module, configured to print a 3×3 array of nine-circle calibration patterns on a metal business card on a work platform of a laser cutting device, and to acquire nine-circle images corresponding to the nine-circle calibration patterns, wherein the nine-circle calibration patterns include feature information of the 3×3 array of nine circles; The acquisition module is further used to set and adjust the CCD imaging component so that the image captured by the adjusted CCD imaging component is consistent with the actual situation; a nine-point calibration module for performing CCD nine-point calibration on the nine-circle image based on a preset image coordinate system and feature information of the nine-circle calibration diagram, and outputting a CCD nine-point calibration result, wherein the preset image coordinate system includes the CCD imaging component coordinate system of the laser cutting device; if the tolerance of the CCD nine-point calibration result is within a preset range, the CCD nine-point calibration is successful; if the tolerance of the CCD nine-point calibration result is greater than a preset value, the CCD nine-point calibration fails, and the imaging template of the CCD imaging component is modified; The nine-point calibration module is further configured to select one of the circles from the nine-circle images as a target positioning circle, and construct a preset image coordinate system with the center of the target positioning circle as the coordinate origin, the horizontal direction as the X-axis, and the vertical direction as the Y-axis, wherein the target positioning circle is the center circle of the nine-circle image; The CCD imaging assembly includes a search area and a circle-finding tool. The nine-point calibration module is further configured to extract the search area and a preset number of circle-finding tools in the CCD imaging assembly if the CCD nine-point calibration fails, and frame the preset number of circle-finding tools with the search area to obtain a new preset area for the CCD imaging assembly; align the center points of the circle-finding tools in the new preset area with the centers of the nine circle images, and perform the CCD nine-point calibration. A correction module, configured to perform linear correction on the metal business card if the nine-point calibration of the CCD is successful; The linear module is used to determine that the laser calibration is successful if the result after linear correction is less than a preset threshold.

7. A laser cutting device, characterized in that: The laser cutting device includes: a memory, a processor, and a laser calibration program stored in the memory and executable on the processor. When the laser calibration program is executed by the processor, the steps of the laser calibration method according to any one of claims 1 to 5 are implemented.

8. A medium, said medium being a computer-readable storage medium, characterized in that: The computer-readable storage medium stores a laser calibration program, which implements the steps of the laser calibration method according to any one of claims 1 to 5 when executed by a processor.

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