Laser etching precision control method and system

Abstract

The invention relates to the technical field of laser processing, in particular to a laser etching precision control method and system. The method comprises the following steps that parameters of a material to be subjected to laser etching and a laser etching pattern are obtained; generating a laser scanning track according to the parameters of the material to be subjected to laser etching and the laser etching pattern; executing laser etching simulation according to the laser scanning track, and synchronously collecting actual coordinates of a laser focus; generating a laser etching edge contour according to the actual coordinates of the laser focus; calculating a position deviation value with a laser scanning track on the laser etching edge contour; acquiring a corresponding laser power parameter based on the position deviation value; and performing partition precision control based on the laser power parameter and the laser carving pattern, and recording and compensating the laser carving precision. Real-time error compensation and precision optimization control of the laser etching process are achieved based on the laser machining technology, the laser etching edge consistency and the overall machining precision are effectively improved, and the machining stability and the finished product quality controllability are enhanced.

Description

Technical Field

[0001] This invention relates to the field of laser processing technology, and in particular to a laser engraving precision control method and system. Background Technology

[0002] In existing mechanical parts and component processing scenarios, laser engraving is mostly used for product identification, serial number imprinting, structural texture processing, or functional surface treatment. Current technologies typically rely on preset power parameters and fixed scanning trajectories to directly execute the processing. Even when some equipment has basic parameter adjustment functions, it largely depends on manual matching of power, frequency, and scanning speed based on human experience, lacking a refined control mechanism tailored to material differences and graphic structural features. Significant shortcomings remain in practical applications: Firstly, different material types and thicknesses exhibit significant differences in laser energy absorption rates, while existing processing methods often use a uniform power template, making it difficult to dynamically adjust energy input based on material characteristics. This easily leads to inconsistent engraving depth, edge melting and diffusion, or localized overheating, affecting the dimensional accuracy and appearance quality of parts. Secondly, traditional laser engraving control primarily focuses on trajectory execution accuracy, neglecting the impact of actual focus shift and material removal variations on the final contour accuracy. It lacks the ability to differentiate control based on processing feedback, especially in complex graphic processing where fine contour areas and large filled areas coexist, making it difficult to simultaneously achieve edge accuracy and processing efficiency. Summary of the Invention

[0003] Therefore, it is necessary for the present invention to provide a laser engraving precision control method and system to solve at least one of the above-mentioned technical problems.

[0004] To achieve the above objectives, a laser engraving precision control method includes the following steps: Step S1: Obtain the parameters of the material to be laser-engraved and the laser engraving pattern; generate a laser scanning trajectory based on the parameters of the material to be laser-engraved and the laser engraving pattern; Step S2: Perform laser engraving simulation according to the laser scanning trajectory, and simultaneously acquire the actual coordinates of the laser focus; generate the laser engraving edge contour based on the actual coordinates of the laser focus; Step S3: Calculate the positional deviation value between the laser-engraved edge contour and the laser scanning trajectory; obtain the corresponding laser power parameters based on the positional deviation value; perform zonal precision control based on the laser power parameters and the laser-engraved graphic, and record the compensated laser engraving precision.

[0005] Preferably, this specification also provides a laser engraving precision control system for executing the above-described laser engraving precision control method, the laser engraving precision control system comprising: The trajectory generation module is used to acquire the parameters of the material to be laser-engraved and the laser engraving pattern; and to generate a laser scanning trajectory based on the parameters of the material to be laser-engraved and the laser engraving pattern. The laser engraving simulation module is used to perform laser engraving simulation according to the laser scanning trajectory and simultaneously acquire the actual coordinates of the laser focus; it also generates the laser engraving edge contour based on the actual coordinates of the laser focus. The precision control module is used to calculate the positional deviation value between the laser-engraved edge contour and the laser scanning trajectory; obtain the corresponding laser power parameters based on the positional deviation value; perform zoned precision control based on the laser power parameters and the laser-engraved graphic, and record the compensation laser engraving precision.

[0006] The beneficial effects of this invention are as follows: (1) By constructing a scanning trajectory generation model based on material parameters and graphic structure before laser engraving, and combining it with the actual coordinates of the laser focus for simulation analysis and deviation extraction, the pre-identification and quantitative calculation of processing errors can be realized, so that the laser power parameters can be dynamically acquired and matched according to the position deviation value, thereby improving the size control capability and precision stability of the engraved contour during the processing of mechanical parts and components.

[0007] (2) During the processing control process, the laser engraving pattern is divided into a fine contour area and a filling area. The low-power multiple superposition scanning strategy and the medium-high power fast scanning strategy are adopted respectively. By partitioning the differential precision control, the efficiency of edge detail processing and large area removal is optimized in a coordinated manner, so that the clarity of the contour and the consistency of the engraving depth are controlled synchronously, and the system's adaptability to complex graphic structures is enhanced.

[0008] (3) Contour compensation displacement vector and laser power adjustment parameters are constructed based on the scan edge position data and engraving depth data, and the compensation laser engraving accuracy is recorded and archived to realize the traceability and reusable control mechanism of processing parameters, reduce repeated trial engraving and manual parameter adjustment process, improve the consistency and automation level of laser engraving processing, and meet the application requirements of high precision and high stability for precision marking and structural processing scenarios of mechanical parts and components. Attached Figure Description

[0009] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the steps of a laser engraving precision control method according to the present invention; Figure 2 This is a schematic diagram illustrating the process of determining the target engraving depth in this invention; Figure 3 This is a schematic diagram of laser engraving on the mechanical parts in this invention; The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0010] The technical method of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0011] Furthermore, the accompanying drawings are merely illustrative of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor methods and / or microcontroller methods.

[0012] It should be understood that although the terms "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are used merely to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0013] To achieve the above objectives, please refer to Figures 1 to 3 This invention provides a method for controlling the precision of laser engraving, the method comprising the following steps: Step S1: Obtain the parameters of the material to be laser-engraved and the laser engraving pattern; generate a laser scanning trajectory based on the parameters of the material to be laser-engraved and the laser engraving pattern; In one embodiment, the parameters of the material to be laser-engraved are obtained, including the material type being 304 stainless steel, the material thickness being 1.2 mm, the material surface reflectivity being 0.62, and the unit energy removal coefficient being... Import the laser engraving graphic vector file, with a graphic size of 40mm×20mm, containing 6 outer contour curves and 1 closed filling area; perform path analysis on the laser engraving graphic, extracting the outer contour path length of 128.4mm; divide the filling area into scanning layer units with a line spacing of 0.05mm, generating 380 parallel filling line segments; calculate the energy requirement per unit length as 0.18J / mm based on the target engraving depth of 0.20mm and the unit energy removal coefficient; generate a complete laser scanning trajectory with a scanning speed of 900mm / s, discretizing it into 12,500 trajectory coordinate points.

[0014] In another embodiment, it is assumed that the material to be laser-engraved is aluminum alloy 6061 with a thickness of 0.8 mm and a unit energy removal coefficient of 0.022 mm³ / J; the laser-engraved graphic size is 60 mm × 30 mm, including 10 outer contour curves and 2 closed filling areas; the target engraving depth is set to 0.15 mm; the filling area is divided according to a line spacing of 0.08 mm, generating 260 scanning layer units; the outer contour is discretized into 8,000 trajectory points, the filling trajectory is discretized into 15,000 trajectory points, and the total number of trajectory points is 23,000; the corresponding scanning trajectory parameters are generated based on the calculated unit length energy requirement of 0.12 J / mm.

[0015] Step S2: Perform laser engraving simulation according to the laser scanning trajectory, and simultaneously acquire the actual coordinates of the laser focus; generate the laser engraving edge contour based on the actual coordinates of the laser focus; In one embodiment, trajectory simulation is performed at a sampling frequency of 1 kHz, acquiring 12,500 sets of actual focal coordinates; the acquired data is then processed using Kalman filtering to remove data with offsets exceeding a certain threshold. There are a total of 35 anomalies; spatial fitting is performed on the remaining coordinates to generate a continuous trajectory; 1,200 energy boundary points are extracted and sorted clockwise to generate a closed laser-engraved edge contour curve.

[0016] In another embodiment, assuming a sampling frequency of 2kHz, 23,000 sets of focus coordinates are acquired; offsets exceeding [a certain threshold] are removed. 120 data points were collected; a continuous trajectory was generated by fitting a cubic spline curve; 2,400 edge contour points were extracted; the perimeter of the closed contour was calculated to be 182.6 mm, and the contour closure error was 0.012 mm.

[0017] Of particular importance, step S2, which generates the laser-engraved edge contour based on the actual coordinates of the laser focus, includes: Arrange the actual coordinates of the laser focus in chronological order and record the sequential coordinates of the laser focus; then denoise the sequential coordinates of the laser focus and remove abnormal coordinate points. In one embodiment, the control system acquires the actual coordinate data of the laser focus in real time at a sampling frequency of 20kHz, obtaining a total of 12,000 coordinate points within a single processing cycle; according to timestamps Sort the coordinates to form a sequence of ordered coordinates. The sequential coordinate sequence was denoised using a median filtering algorithm with a sliding window length of 5, and the instantaneous velocity change rate between each coordinate point and its two adjacent points was calculated. When the velocity change was greater than the set threshold of 0.50 mm / ms, the corresponding coordinate point was marked as an anomaly. A total of 135 anomalies were found, accounting for 1.125%. After removing the anomalies, 11,865 valid coordinate points were retained, forming a smoothed set of laser focus sequential coordinates.

[0018] In another embodiment, assuming a sampling frequency of 30kHz, 20,000 actual coordinate points are acquired in a single scan; a cubic spline smoothing algorithm is used for curve fitting and noise reduction, and a spatial deviation threshold of ±0.03mm is set; assuming 260 abnormal jump points are detected, accounting for 1.3% of the total number of points; after removing abnormal points, 19,740 valid coordinate points remain; the valid coordinate points are normalized to generate a standardized sequential coordinate sequence.

[0019] A continuous trajectory curve is generated by fitting lines between adjacent actual coordinate points in the laser focus sequence coordinates; the boundary points of the energy effect range are identified based on the continuous trajectory curve; and the laser-engraved edge contour is generated based on the boundary points of the energy effect range.

[0020] In one embodiment, a piecewise linear fitting method is used on the smoothed sequential coordinate set to match adjacent coordinate points. and Connect the points to construct a continuous trajectory curve; when the distance between adjacent points is greater than 0.08 mm, perform interpolation to supplement the points, so that the distance between trajectory points is controlled within 0.05 mm; after fitting, a continuous trajectory curve with a length of approximately 1,250 mm is generated; based on the laser spot diameter of 0.10 mm, calculate the energy radius of each trajectory point to be 0.05 mm, and offset it to both sides with the trajectory curve as the center line to form an energy coverage zone; extract a total of 2,400 outermost boundary points of the coverage zone to generate a closed energy coverage boundary; connect the boundary points sequentially to obtain the laser engraving edge contour; the perimeter of the generated contour is calculated to be 315 mm.

[0021] In another embodiment, assuming 19,740 sequential coordinate points, a cubic Bézier curve is used for piecewise fitting, resulting in a continuous trajectory curve with a total length of 1,600 mm. Assuming a laser spot diameter of 0.12 mm, the energy radius is 0.06 mm. The energy coverage area boundary is generated by extending along the normal direction at 0.04 mm intervals. Assuming 3,200 boundary points are identified, forming two closed contours, the calculated perimeter of the main contour is 420 mm, and the maximum local offset error is 0.018 mm. The generated laser-engraved edge contour data is output as a contour coordinate sequence. .

[0022] Step S3: Calculate the positional deviation value between the laser-engraved edge contour and the laser scanning trajectory; obtain the corresponding laser power parameters based on the positional deviation value; perform zonal precision control based on the laser power parameters and the laser-engraved graphic, and record the compensated laser engraving precision.

[0023] In one embodiment, the laser-engraved edge contour is resampled with equal arc length to obtain 1,000 contour feature points; the laser scanning trajectory is resampled accordingly to obtain 1,000 reference points; and the lateral offset between corresponding points is calculated. and longitudinal offset ; Calculate the position deviation value The deviation ranges from 0.008mm to 0.045mm, with an average deviation of 0.021mm; according to the compensation model... The laser power adjustment parameters are generated, with a power correction range of +4% to +12%. The graphic is divided into a fine contour region (accounting for 35% of the total contour length) and a filled region. The fine contour region is scanned three times with 30% of the rated power. The filled region is scanned quickly with 65% of the rated power. After compensation, the maximum contour deviation is reduced from 0.045mm to 0.012mm.

[0024] In another embodiment, it is assumed that 2,000 matching points are obtained after resampling; the calculated position deviation range is 0.005mm to 0.060mm, and the average deviation is 0.028mm; the power correction model is set as follows. The maximum power correction was +18%; the total area of ​​the graphic was 1,800 mm², of which the fine contour area accounted for 25% and the filled area accounted for 75%; the contour area was scanned 4 times with 25% of the rated power; the filled area was scanned at 70% of the rated power with a scanning speed of 1,000 mm / s; after compensation, the maximum contour deviation was reduced from 0.060 mm to 0.015 mm, and the depth deviation of the filled area was reduced from ±0.030 mm to ±0.008 mm; the compensated power parameters and accuracy data were written into the material process database.

[0025] It should be noted that you should refer to [link / reference]. Figure 2Starting from the beginning, the process proceeds through three sequential steps: matching the unit energy removal coefficient using the material type, determining the upper limit of the engraving depth based on the coefficient and the material thickness, and calculating the theoretical engraving depth based on the preset engraving ratio coefficient and the material thickness. Then, it enters the judgment rhombus: if the theoretical engraving depth is less than or equal to the upper limit of the engraving depth, the theoretical engraving depth is taken as the first engraving depth; otherwise, the upper limit of the engraving depth is taken as the second engraving depth. After the two branches merge, the process proceeds through determining the target engraving depth and outputting the target engraving depth, finally reaching the end node.

[0026] It should be noted that you should refer to [link / reference]. Figure 3 This image shows the actual effect of laser engraving on a cylindrical metal workpiece. The workpiece surface has a metallic luster after being brushed. The laser engraves the clear "HYC-300B" lettering on its curved surface. The lettering has uniform depth and clear edge contours, demonstrating a typical application scenario of high-precision marking on curved metal surfaces using laser engraving.

[0027] Preferably, step S1, generating the laser scanning trajectory based on the parameters of the material to be laser-engraved and the laser-engraved pattern, includes: Analyze the laser engraving graphic to extract the outer contour path and the inner filling area path; determine the target engraving depth using the material type and material thickness parameters of the material to be laser engraved. In one embodiment, the DXF vector file of the laser engraving graphic is read. The graphic size is 50mm × 25mm, containing 8 outer contour curves and 2 closed inner regions. Closure detection and topology analysis are performed on each path to identify the outermost closed path as the outer contour path with a perimeter of 156.3mm. The two closed regions located inside the outer contour are identified as inner filling regions with areas of 420mm² and 185mm², respectively. The parameters of the material to be laser engraved are obtained. The material type is 304 stainless steel, the material thickness is 1.0mm, and the unit energy removal coefficient is 0.016mm³ / J. The maximum engraving depth is set to 0.30mm based on the material thickness. The theoretical engraving depth is calculated to be 0.18mm based on the preset engraving ratio coefficient of 0.6. The theoretical engraving depth is compared with the maximum engraving depth to determine the target engraving depth as 0.18mm.

[0028] In another embodiment, assuming the laser-engraved graphic is 80mm × 40mm in size, containing 12 outer contour curves and 3 closed filling areas; the total length of the outer contour is 245.8mm; the areas of the three filling areas are 650mm², 320mm², and 210mm², respectively; the material to be laser-engraved is aluminum alloy 6061 with a thickness of 0.8mm and a unit energy removal coefficient of 0.022mm³ / J; the maximum engraving depth is set to 0.25mm; the preset engraving ratio coefficient is 0.7, so the theoretical engraving depth is 0.56mm; since the theoretical engraving depth is greater than the maximum engraving depth, the target engraving depth is determined to be 0.25mm.

[0029] Of particular importance is the analysis of laser-engraved graphics to extract the outer contour path and the inner fill area path, including: Obtain the vector data file corresponding to the laser engraving graphic; filter closed structural paths based on the vector data file; establish a topological hierarchy based on the filtered closed structural paths; In one embodiment, a DXF format vector data file is read, and the LINE, ARC, and SPLINE entities are parsed to extract a total of 1,850 path segments. Endpoint connectivity analysis is performed on each path segment, and a closed path is defined as one where the distance between the first and last endpoints is less than 0.01 mm. After merging operations, 48 ​​closed structural paths are obtained. The area and geometric center coordinates of each closed structural path are calculated, and the inclusion relationship is determined using the ray casting method. A tree-like topology is constructed based on the inclusion relationship, with 5 outermost paths, 23 second-level nested paths, and 20 third-level nested paths. Finally, a topology hierarchy index table is generated to distinguish between outer contours and internal structural paths.

[0030] In another embodiment, assuming an SVG format vector file is read, 2,400 path objects are obtained through parsing; a closure error threshold of 0.02mm is set, and 60 closed-structure paths are obtained after path concatenation; assuming the largest bounding rectangle size is 120mm × 80mm; the path nesting level is determined by an odd-even rule algorithm, resulting in 8 first-level paths, 30 second-level paths, and 22 third-level paths; a containment matrix M (60 × 60) is established, if the path If it is contained in path j, then Generate hierarchical depth values ​​based on matrix statistics, with a maximum nesting depth of 3 levels; form a complete topological hierarchical relationship data structure.

[0031] Based on the topological hierarchy, the path located at the outermost layer of the closed structural path and not surrounded by other closed structural paths is identified as the outer contour path; the solid processing area is identified based on the outer contour path; and the inner filling area path is extracted from the solid processing area.

[0032] In one embodiment, based on the established topological hierarchy, paths with a depth of 1 and not contained by other paths are selected as outer contour paths, resulting in the identification of 5 outer contour paths. The total area enclosed by all outer contour paths is calculated to be 6,500 mm². Solid processing regions are constructed using the outer contour paths as boundaries. Within each solid processing region, its direct sub-paths (paths with a depth of 2) are retrieved as inner filling region paths, resulting in the extraction of 23 inner filling paths. The area and minimum enclosing rectangle size of each inner filling path are calculated, with the minimum filling unit area being 15 mm² and the maximum being 480 mm². The inner filling region paths are then used to generate a path sequence set. .

[0033] In another embodiment, it is assumed that there are 60 closed structural paths, of which the outermost 8 paths are identified as outer contour paths; the total area of ​​the corresponding solid processing region is assumed to be 9,800 mm²; 30 inner filling region paths are identified within each solid processing region, of which 20 are second-level nested paths and 10 are third-level nested paths; the minimum filling region area is assumed to be 10 mm² and the maximum filling region area is assumed to be 650 mm²; all inner filling region paths are sorted by area size, and their geometric center coordinates and perimeter parameters are recorded, for example, the average perimeter is 95 mm and the maximum perimeter is 210 mm; finally, the outer contour path set O and the inner filling region path set are generated.

[0034] The scanning layer units of the inner filling area path are divided according to the preset line spacing; a continuous curve trajectory is generated based on the outer contour path; and a laser scanning trajectory is generated based on the continuous curve trajectory and the scanning layer units.

[0035] In one embodiment, for two filling areas with areas of 420 mm² and 185 mm², equidistant parallel baselines are generated according to a preset line spacing of 0.06 mm; the intersection points of the baselines and the boundaries of the filling areas are calculated and trimmed to generate effective scanning line segments, forming a total of 520 filling scanning layer units; the outer contour path is discretized with equal arc length and a sampling interval of 0.02 mm to generate 7,800 continuous curve trajectory points; the filling scanning layer units are numbered and their forward and backward directions are unified; the continuous curve trajectory and scanning layer units are spliced ​​according to the processing priority of "contour first, then filling", and finally, laser scanning trajectory data containing 18,500 coordinate points is generated.

[0036] In another embodiment, assuming the total area of ​​the three filling regions is 1,180 mm², and the preset line spacing is 0.08 mm; 1,240 filling scanning layer units are generated through a region clipping algorithm; the outer contour path is discretized at a sampling interval of 0.03 mm to obtain 10,500 continuous curve trajectory points; the filling path is optimized by serpentine arrangement to reduce idle travel, and the total number of effective scanning segments after optimization is 1,180 segments; after being spliced ​​according to a preset processing order, a complete laser scanning trajectory is generated, with a total of 32,000 trajectory points; the total trajectory length is approximately 3,450 mm.

[0037] Preferably, determining the target engraving depth using the material type and thickness parameters of the material to be laser engraved includes: Match the corresponding unit energy removal coefficient using the material type in the parameters of the material to be laser engraved; determine the upper limit of the engraving depth based on the unit energy removal coefficient and the material thickness. In one embodiment, a database corresponding to material types and unit energy removal coefficients is established, including 304 stainless steel (…). ), Aluminum alloy 6061 ( ), Brass H62 ( Material parameters such as ) are used; when the material to be laser-engraved is 304 stainless steel with a thickness of 1.2mm, the energy removal coefficient is obtained. Based on the equipment's maximum output energy density of 15J / mm², and combined with the unit energy removal coefficient, the maximum removal volume per unit area is calculated to be 0.24mm³ / mm². Further, based on the material thickness and the thermal influence coefficient (set to 0.85), the upper limit of the engraving depth is calculated to be 0.30mm. If the material thickness is less than 0.5mm, the upper limit of the depth is limited to 60% of the thickness to avoid penetration.

[0038] In another embodiment, assuming the material type is aluminum alloy 7075 and the material thickness is 0.8mm, the unit energy removal coefficient matched in the database is 0.025mm³ / J; assuming the maximum energy density of the equipment is 18J / mm², the maximum removal volume per unit area is 0.45mm³ / mm²; combined with a safety correction factor of 0.75, the upper limit of the engraving depth is calculated to be 0.27mm; if the material thickness is 0.6mm, then it is limited by 50% of the thickness, and the upper limit of the engraving depth is adjusted to the smaller value between 0.30mm and 0.30mm, i.e., 0.27mm; if the material thickness is 1.5mm, then the upper limit of the engraving depth is limited to 0.35mm.

[0039] The theoretical carving depth is calculated based on the preset carving ratio coefficient and material thickness. When the theoretical carving depth is less than or equal to the upper limit of the carving depth, the theoretical carving depth is taken as the first carving depth. When the theoretical carving depth is greater than the upper limit of the carving depth, the upper limit of the carving depth is taken as the second carving depth. The target carving depth is determined based on the first carving depth and the second carving depth.

[0040] In one embodiment, if the preset engraving ratio coefficient is 0.4 and the material thickness is 1.2mm, then the theoretical engraving depth is 0.48mm. This is compared with the upper limit of the engraving depth of 0.30mm determined in step S1. Since 0.48mm is greater than 0.30mm, 0.30mm is taken as the second engraving depth. The final target engraving depth is determined to be 0.30mm. If the material thickness is 0.6mm and the engraving ratio coefficient is 0.3, then the theoretical engraving depth is 0.18mm, which is less than the upper limit of the engraving depth of 0.25mm. Therefore, 0.18mm is taken as the first engraving depth, and the target engraving depth is determined to be 0.18mm.

[0041] In another embodiment, assuming the material thickness is 0.8mm and the preset engraving ratio is 0.6, the theoretical engraving depth is 0.48mm; the upper limit of the engraving depth is 0.27mm, so 0.27mm is used as the second engraving depth, and the target engraving depth is 0.27mm; if the material thickness is 1.0mm and the engraving ratio is 0.25, the theoretical engraving depth is 0.25mm, which is less than the upper limit of the engraving depth of 0.32mm, so 0.25mm is used as the first engraving depth, and the target engraving depth is 0.25mm; if the material thickness is 1.5mm and the engraving ratio is 0.5, the theoretical engraving depth is 0.75mm, which is greater than the upper limit of the engraving depth of 0.35mm, so the target engraving depth is limited to 0.35mm.

[0042] Preferably, generating the laser scanning trajectory based on the continuous curve trajectory and scanning hierarchy units includes: The start and end points of the continuous curve trajectory are sorted to generate a contour processing sequence; the scanning layer units are numbered and their directions are unified to generate a filling processing sequence. In one embodiment, the continuous curve trajectory of the outer contour is discretized with equal arc length, and the sampling interval is set to 0.02 mm, resulting in a total of 8,200 contour trajectory points. Based on the shortest path principle, the start and end points of each contour segment are sorted, and a neighboring point distance threshold of 0.05 mm is used for splicing judgment to eliminate 3 breakpoints, forming a single closed contour processing sequence. For the inner filling area, 540 scanning layer units are generated with a line spacing of 0.06 mm. Each scanning line is numbered (F1 to F540), and a "reciprocating serpentine" method is used to unify the scanning direction, so that the starting point spacing of adjacent scanning lines is controlled within 0.08 mm. Finally, one contour processing sequence and 540 filling processing sequences are generated.

[0043] In another embodiment, assuming the outer contour is a complex multi-segment spline curve with a total length of 310.5 mm, 10,350 trajectory points are generated at a sampling interval of 0.03 mm. The multi-segment contour is sorted using a minimum spanning tree algorithm, reducing the idle travel distance by approximately 18%, and the original 7 separate contour segments are integrated into 2 continuous contour processing sequences. The inner filling area is 1,250 mm², and 1,420 scanning layer units are generated at a line spacing of 0.08 mm. The scanning lines are processed by odd and even numbering, with odd numbers being scanned in the forward direction and even numbers in the reverse direction, reducing the average reversal time from 12 ms to 5 ms. Finally, 2 contour processing sequences and 1,420 filling processing sequences are formed.

[0044] The contour processing sequence and the filling processing sequence are spliced ​​together according to the preset processing priority, and the spliced ​​coordinate sequence is recorded; a laser scanning trajectory is generated based on the spliced ​​coordinate sequence.

[0045] In one embodiment, the processing priority is set to "outer contour first, then inner fill", and a 50ms delay is set after the contour processing is completed to stabilize the power. The 8,200 coordinate points of the contour processing sequence are sequentially spliced ​​with 540 fill processing sequences to generate a complete spliced ​​coordinate sequence with a total of 24,600 trajectory points. The spliced ​​coordinate sequence is subjected to speed calibration processing, with the contour segment scanning speed set to 150mm / s and the fill segment scanning speed set to 300mm / s. A laser scanning trajectory file (G-code format) is generated based on the spliced ​​coordinate sequence, with a total trajectory length of approximately 2,980mm.

[0046] In another embodiment, assuming the processing priority is adjusted to "inner contour first, then outer contour, then filling", and 15 transition empty stroke segments are inserted between different regions, each with an average length of 3.5mm; the total number of coordinate points after splicing is 36,800, including 12,000 contour trajectory points and 24,000 filling trajectory points; the scanning speed is set to 120mm / s for the contour region and 280mm / s for the filling region; after trajectory smoothing algorithm processing, the peak acceleration at the inflection point is reduced from 1.8m / s² to 1.2m / s²; finally, a laser scanning trajectory is generated with a total length of approximately 4,150mm.

[0047] Preferably, in step S3, calculating the positional deviation value between the laser-engraved edge contour and the laser scanning trajectory includes: The coordinate discretization process is performed based on the laser-engraved edge contour to extract the set of contour feature points; the equal arc resampling is performed based on the laser scanning trajectory to record the set of trajectory reference points; In one embodiment, the laser-engraved edge contour obtained by visual acquisition is denoised and smoothed, and a continuous contour curve is reconstructed using a cubic spline curve fitting method; the contour is discretized and sampled at equal arc length intervals of 0.01 mm to obtain a set of contour feature points, totaling 6,500 discrete points; the original laser scanning trajectory is resampled at equal arc lengths with a resampling step size of 0.01 mm to generate a set of trajectory reference points, totaling 6,480 reference points; to ensure a one-to-one correspondence, the trajectory reference points are sequentially numbered (T1~T6480), the contour feature points are sequentially numbered (C1~C6500), and the two-dimensional coordinate values ​​(x,y) of each point are recorded.

[0048] In another embodiment, assuming the laser-engraved pattern is a complex curved surface projection contour with a total length of 420.6 mm, the laser-engraved edge contour is discretized at 0.02 mm arc length intervals to obtain a contour feature point set of 10,530; the laser scanning trajectory is resampled at 0.02 mm arc lengths to generate a trajectory reference point set of 10,500; high curvature regions with a contour curvature greater than 0.8 mm⁻¹ are sampled more densely to add an additional 1,200 feature points, bringing the total number of contour feature points to 11,730; the trajectory reference point set remains at 10,500.

[0049] Match corresponding points in the contour feature point set and the trajectory reference point set; calculate the lateral and longitudinal offsets of the corresponding points; calculate the position deviation value based on the lateral and longitudinal offsets.

[0050] In one embodiment, a nearest neighbor matching algorithm is used to search for contour feature points Ci within a radius of 0.03 mm at each trajectory reference point Ti, and establish corresponding point pairs; 6,420 point pairs are successfully matched, with a matching success rate of 99.1%; the lateral offset is calculated for each pair of matched points. Vertical offset Further calculate the positional deviation value. The average lateral offset was 0.012 mm, the average longitudinal offset was 0.009 mm, and the maximum positional deviation was 0.038 mm. Areas with a positional deviation greater than 0.03 mm were marked as high-deviation areas, totaling 85 areas.

[0051] In another embodiment, assuming that 10,200 pairs of corresponding points are obtained after matching, and the matching radius is set to 0.05mm; the range of horizontal offset is [-0.045mm, 0.052mm], and the range of vertical offset is [-0.040mm, 0.048mm]; the average position deviation is calculated to be 0.021mm, and the standard deviation is 0.008mm; among them, there are a total of 320 points with a position deviation greater than 0.04mm, accounting for 3.14% of the total number of matched points; the maximum deviation is 0.067mm, which appears in the sharp bend area with a curvature radius of less than 1.5mm; the comprehensive deviation vector is calculated based on the horizontal and vertical offsets.

[0052] Preferably, in step S3, the zoning accuracy control is performed based on the laser power parameters and the laser engraving pattern, and the compensation for laser engraving accuracy is recorded, including: The laser-engraved graphic is divided into a fine outline region and a filled region; a fine scanning control strategy is used for the fine outline region using laser power parameters; and a fast scanning control strategy is used for the filled region using laser power parameters. In one embodiment, curvature analysis and linewidth detection are performed on the laser-engraved pattern, and a curvature threshold is set as follows: The fine line width threshold is 0.15mm. A total of 48 abruptly changing arc segments and 35 narrow line segments were identified. The areas containing these arc segments were marked as the fine contour region, with a total area of ​​approximately 120mm². The remaining closed contour areas were marked as the filled region, with a total area of ​​approximately 860mm². In the fine contour region, the laser power parameters were set to 30% of the rated power, corresponding to an output power of 12W, a single pulse energy of 0.12mJ, and a scanning speed of 120mm / s, with three repeated scans. In the filled region, the laser power parameters were set to 65% of the rated power, corresponding to an output power of 26W, a single pulse energy of 0.55mJ, and a scanning speed of 300mm / s, using a single round-trip scanning strategy to complete the processing.

[0053] In another embodiment, assuming the total area of ​​the laser-engraved pattern is 1,500 mm², the area of ​​the fine contour region after curvature and line width calculation is 210 mm², including 72 sharp bends and 54 narrow line segments, with the remaining 1,290 mm² being the filling area; in the fine contour region, the laser power is set to 25% of the rated power, with an output power of 10 W, a single pulse energy of 0.08 mJ, a scanning speed of 100 mm / s, and 4 repeated scans; in the filling region, the laser power is set to 75% of the rated power, with an output power of 30 W, a single pulse energy of 0.70 mJ, a scanning speed of 320 mm / s, and a pulse interval of 0.05 mm for rapid filling scanning; a power transition time of 30 ms is set between the contour region and the filling region.

[0054] The accuracy of laser engraving is recorded based on the fine scanning control strategy and the fast scanning control strategy.

[0055] In one embodiment, the actual edge contour coordinates are obtained and matched with the target contour. The average edge offset is 0.014 mm, and the maximum offset is 0.032 mm. After contour compensation displacement vector correction, the average offset is reduced to 0.006 mm. In the filled area, the average engraving depth is calculated to be 0.178 mm based on the depth detection data, and the deviation from the target depth of 0.180 mm is 0.002 mm. The contour area compensation accuracy improvement rate is recorded to be approximately 57%, and the filling area depth error is controlled within ±0.005 mm.

[0056] In another embodiment, assuming the initial average offset of the fine contour area is 0.025mm and the maximum offset is 0.061mm, after power and trajectory compensation, the average offset is reduced to 0.009mm and the maximum offset is reduced to 0.028mm; the target engraving depth of the filling area is 0.250mm, the initial average processing depth is 0.232mm, which is increased to 0.247mm after dynamic power adjustment, and the depth error is reduced from 0.018mm to 0.003mm; the overall laser engraving accuracy compensation value is recorded as 0.016mm, and the overall processing accuracy is improved by approximately 64%.

[0057] Preferably, dividing the laser-engraved graphic into a fine outline area and a filled area includes: The line width and radius of curvature parameters of each vector segment are extracted based on the laser engraving pattern; the curvature value is calculated based on the radius of curvature parameter. In one embodiment, path parsing is performed on the input vector graphics, splitting the overall path into several continuous vector segments, extracting a total of 320 vector segments; the nominal line width parameter is calculated for each vector segment, with a line width range of 0.08mm to 0.60mm; simultaneously, three-point fitting or circular arc fitting is performed on the curve segments, and the radius of curvature R is calculated, with a radius range of 0.30mm to 15mm; according to the curvature formula... Calculate the curvature value, and obtain the range of curvature values. ~ The line width parameter and curvature value are stored in the vector segment attribute table respectively, forming a line width-curvature parameter mapping set.

[0058] In another embodiment, assuming the laser-engraved pattern contains 500 vector segments, including 280 straight line segments, 160 arc segments, and 60 Bézier curve segments; the curve segments are discretely sampled, with 20-50 sampling points per segment, and the fitted curvature radius R is distributed between 0.20mm and 20mm; the corresponding curvature values Distributed in ~ Between; the line width parameter statistics show that the minimum line width is 0.05mm, the maximum line width is 0.80mm, and the average line width is 0.32mm; normalize all parameters to the [0,1] interval.

[0059] If the curvature value is greater than the preset curvature threshold, the vector segment corresponding to the curvature value is marked as an abrupt turning arc segment; if the line width parameter is less than or equal to the preset fine line width threshold, the vector segment corresponding to the line width parameter is marked as a narrow line arc segment. In one embodiment, a preset curvature threshold is set. for The corresponding radius of curvature is approximately 0.83mm; a preset fine linewidth threshold is set. The curvature value is 0.15mm. After traversing all 320 vector segments, 42 vector segments with a curvature value greater than 1.20mm⁻¹ are selected and marked as abruptly turning arc segments. 38 vector segments with a line width less than or equal to 0.15mm are selected and marked as narrow line arc segments. Among them, 15 vector segments meet both conditions and are double-marked.

[0060] In another embodiment, it is assumed that a preset curvature threshold is used. Set as The fine line width threshold w0 was set to 0.12mm; from 500 vector segments, 75 abruptly turning arc segments were identified, accounting for 15%; 60 narrow line arc segments were identified, accounting for 12%; and 20 overlapping segments were identified; a marker array was generated for all vector segments that met the conditions. ,when or hour, ,otherwise Generate a set of indexes for the marked vector segments.

[0061] The areas containing abruptly turning arcs and narrow line arcs are marked as fine outline areas, and the remaining areas in the laser-engraved graphic that are inside the closed outline are marked as filled areas.

[0062] In one embodiment, based on the tag array The spatial coordinate range of the corresponding vector segments was extracted, and adjacent vector segments that met the conditions were merged to form 28 continuous contour fine regions, with a total path length of approximately 95 mm and a total area of ​​approximately [missing information]. Topological analysis was performed on the remaining unlabeled closed contour regions to confirm that the filled area was approximately [missing information]. Generate the fine contour region mask matrix and the filling region mask matrix respectively.

[0063] In another embodiment, it is assumed that 45 fine contour regions are finally identified out of 500 vector segments, with a total path length of 180mm, accounting for 22% of the overall path length; the corresponding area is 260mm², accounting for 17.3% of the total graphic area of ​​1,500mm²; the remaining 1,240mm² area is marked as a filled area; a priority processing flag Flag=2 is set for the fine contour regions, and a processing flag Flag=1 is set for the filled areas; after completing the region division, a region number table and a coordinate boundary data table are output.

[0064] Preferably, the fine scanning control strategy for the fine contour region using laser power parameters is as follows: In the fine contour area, the laser power parameters are adjusted to a low power output state, specifically the laser output power is set to 20% to 40% of the rated power, and the single pulse energy is controlled at 0.05mJ to 0.20mJ; in the low power output state, the fine contour area is scanned according to the preset number of repeated scans, and the scan edge position data is recorded simultaneously. In one embodiment, the rated power of the laser device is set to 50W, and the output power in the fine contour area is set to 30% of the rated power, i.e., 15W; the single pulse energy is controlled at 0.12mJ, the pulse frequency is set to 80kHz, and the scanning speed is 110mm / s; the preset number of repeated scans is 3, and the interval between adjacent scans is 20ms; during each scan, edge position data is collected by an online visual inspection module at a resolution of 5μm, and an average of 450 edge sampling points are collected for each contour path; after completing 3 scans, a total of 1,350 edge position data points are recorded, and a corresponding data table of the number of scans and edge position deviations is established.

[0065] In another embodiment, assuming the laser's rated power is 60W, the output power is set to 25% of the rated power, i.e., 15W, in the fine contour area; the single pulse energy is set to 0.08mJ, the pulse frequency to 100kHz, and the scanning speed to 90mm / s; the preset number of repeated scans is 4; assuming the total contour path length is 180mm and the number of sampling points per millimeter is 6, then a single scan records 1,080 edge position data points, and 4 scans cumulatively record 4,320 edge sampling points; the initial average edge burr width is statistically obtained to be 0.018mm, which is reduced to 0.009mm after multiple low-power scans.

[0066] The edge coordinate sequence is extracted based on the scan edge position data; the edge coordinate sequence is matched and aligned with the corresponding contour coordinate sequence in the fine contour region, and the edge offset is calculated; the contour compensation displacement vector is generated based on the edge offset, and the scan is performed using the contour compensation displacement vector to complete the fine scan control strategy.

[0067] In one embodiment, an edge coordinate sequence is generated from the collected edge position data according to the scanning order. Where n=1,350; this is compared with the target contour coordinate sequence. Nearest neighbor matching is performed, and rigid alignment is achieved using the least squares method. The lateral offset of each corresponding point is calculated. and longitudinal offset The average edge offset was found to be 0.016 mm, and the maximum offset was 0.038 mm. According to... , Constructing the compensation displacement vector The compensation displacement vector is superimposed on the original scan trajectory to generate the corrected scan trajectory; after one compensation scan, the average offset is reduced to 0.006 mm and the maximum offset is reduced to 0.015 mm.

[0068] In another embodiment, assuming the edge coordinate sequence has 4,320 points, an offset data set is obtained by matching each point with the target contour sequence; assuming the lateral offset range is -0.030mm to 0.028mm and the longitudinal offset range is -0.022mm to 0.025mm; the calculated average overall positional deviation is 0.021mm; a two-dimensional compensation matrix is ​​constructed based on the offset, and a corresponding set of compensation displacement vectors is generated. After compensation scanning, assuming the average edge offset decreases to 0.008mm and the standard deviation of offset decreases from 0.012mm to 0.004mm, the compensation parameters are stored in the control system database for subsequent adaptive precision control of the fine contour area.

[0069] Preferably, the fast scanning control strategy for the filling area using laser power parameters is as follows: In the filling area, the laser power parameters are adjusted to a medium-high power output value, specifically, the laser output power is set to 50% to 80% of the rated power, and the single pulse energy is controlled at 0.30mJ to 0.80mJ; the pulse spacing parameter is set using the medium-high power output value; the filling area is scanned according to the pulse spacing parameter, and the engraving depth data is recorded; In one embodiment, the rated power of the laser device is set to 50W, and the output power in the filling area is set to 70% of the rated power, i.e., 35W; the single pulse energy is controlled at 0.60mJ, and the pulse frequency is set to 60kHz; the optimal pulse spacing is calculated to be 0.06mm based on the material removal characteristics, corresponding to a scanning speed of 360mm / s; a unidirectional reciprocating scan is performed on the filling area of ​​approximately 900mm², forming a filling scan path length of 1,800mm; the engraving depth data is recorded with an online confocal displacement sensor at a sampling accuracy of 10μm, collecting 25 depth sampling points per square millimeter, for a total of 22,500 depth data points; the initial average engraving depth is calculated to be 0.185mm.

[0070] In another embodiment, assuming the laser's rated power is 60W, the output power in the filling area is set to 75% of the rated power, i.e., 45W; the single pulse energy is set to 0.75mJ, and the pulse frequency is 80kHz; assuming the pulse spacing is set to 0.05mm, and the scanning speed is 400mm / s; the filling area is 1,200mm², and 30 depth points are collected per square millimeter, resulting in a cumulative collection of 36,000 depth data points; assuming the target engraving depth is 0.250mm, the average engraving depth measured after the first scan is 0.228mm, the maximum depth is 0.260mm, and the minimum depth is 0.210mm.

[0071] The actual removal amount is calculated based on the engraving depth data; the depth deviation value is determined based on the actual removal amount; laser power adjustment parameters are generated based on the depth deviation value, and scanning control commands are generated using the laser power adjustment parameters; fast scanning control is executed according to the scanning control commands to complete the fast scanning control strategy.

[0072] In one embodiment, the target engraving depth is set to 0.200 mm, and compared with the measured average engraving depth of 0.185 mm, the actual removal amount is calculated to be 0.185 mm, and the depth deviation value is... Based on the material unit energy removal coefficient of 0.004mm / mJ, the required compensation energy is calculated to be 3.75mJ. Accordingly, the laser output power is increased by 5%, adjusted to 75% of the rated power, and the single pulse energy is increased to 0.65mJ. A compensation scan control command is generated to execute a second rapid scan. After compensation, the average engraving depth is measured to be 0.198mm, and the depth error is controlled within ±0.003mm.

[0073] In another embodiment, assuming the target engraving depth is 0.250 mm and the average depth of the first scan is 0.228 mm, then the depth deviation value... Assuming the material unit energy removal coefficient is 0.005 mm / mJ, then an increase of 4.4 mJ of energy per unit area is required. Based on this, the system increases the laser output power from 75% to 80%, the single-pulse energy from 0.75 mJ to 0.82 mJ, and simultaneously reduces the pulse spacing from 0.05 mm to 0.045 mm. Updated scanning control commands are generated and a second rapid scan is executed. Assuming the average engraving depth reaches 0.247 mm after compensation, the maximum deviation is reduced to 0.006 mm, and the overall depth uniformity standard deviation decreases from 0.014 mm to 0.005 mm, the power adjustment parameters and depth deviation data are stored in the control database.

[0074] Therefore, the embodiments should be considered as exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of the equivalents of the application be incorporated into the invention.

[0075] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A method for controlling the precision of laser engraving, characterized in that, Includes the following steps: Step S1: Obtain the parameters of the material to be laser-engraved and the laser engraving pattern; generate a laser scanning trajectory based on the parameters of the material to be laser-engraved and the laser engraving pattern; Step S2: Perform laser engraving simulation according to the laser scanning trajectory, and simultaneously acquire the actual coordinates of the laser focus; generate the laser engraving edge contour based on the actual coordinates of the laser focus; Step S3: Calculate the positional deviation value between the laser-engraved edge contour and the laser scanning trajectory; obtain the corresponding laser power parameters based on the positional deviation value; perform zonal precision control based on the laser power parameters and the laser-engraved graphic, and record the compensated laser engraving precision.

2. The laser engraving precision control method according to claim 1, characterized in that, Step S1, which generates the laser scanning trajectory based on the parameters of the material to be laser-engraved and the laser-engraved pattern, includes: Analyze the laser engraving graphic to extract the outer contour path and the inner filling area path; determine the target engraving depth using the material type and material thickness parameters of the material to be laser engraved. The scanning layer units of the inner filling area path are divided according to the preset line spacing; a continuous curve trajectory is generated based on the outer contour path; and a laser scanning trajectory is generated based on the continuous curve trajectory and the scanning layer units.

3. The laser engraving precision control method according to claim 2, characterized in that, Determining the target engraving depth using the material type and thickness parameters of the material to be laser engraved includes: Match the corresponding unit energy removal coefficient using the material type in the parameters of the material to be laser engraved; determine the upper limit of the engraving depth based on the unit energy removal coefficient and the material thickness. The theoretical carving depth is calculated based on the preset carving ratio coefficient and material thickness. When the theoretical carving depth is less than or equal to the upper limit of the carving depth, the theoretical carving depth is taken as the first carving depth. When the theoretical carving depth is greater than the upper limit of the carving depth, the upper limit of the carving depth is taken as the second carving depth. The target carving depth is determined based on the first carving depth and the second carving depth.

4. The laser engraving precision control method according to claim 2, characterized in that, The laser scanning trajectory is generated based on continuous curve trajectories and scanning hierarchy units, including: The start and end points of the continuous curve trajectory are sorted to generate a contour processing sequence; the scanning layer units are numbered and their directions are unified to generate a filling processing sequence. The contour processing sequence and the filling processing sequence are spliced ​​together according to the preset processing priority, and the spliced ​​coordinate sequence is recorded; a laser scanning trajectory is generated based on the spliced ​​coordinate sequence.

5. The laser engraving precision control method according to claim 1, characterized in that, Step S3, calculating the positional deviation value between the laser-engraved edge contour and the laser scanning trajectory, includes: The coordinate discretization process is performed based on the laser-engraved edge contour to extract the set of contour feature points; the equal arc resampling is performed based on the laser scanning trajectory to record the set of trajectory reference points; Match corresponding points in the contour feature point set and the trajectory reference point set; calculate the lateral and longitudinal offsets of the corresponding points; calculate the position deviation value based on the lateral and longitudinal offsets.

6. The laser engraving precision control method according to claim 1, characterized in that, In step S3, based on the laser power parameters and the laser engraving pattern, zoning accuracy control is performed, and the compensation laser engraving accuracy is recorded, including: The laser-engraved graphic is divided into a fine outline region and a filled region; a fine scanning control strategy is used for the fine outline region using laser power parameters; and a fast scanning control strategy is used for the filled region using laser power parameters. The accuracy of laser engraving is recorded based on the fine scanning control strategy and the fast scanning control strategy.

7. The laser engraving precision control method according to claim 6, characterized in that, The laser-engraved graphic is divided into a fine outline area and a filled area, including: The line width and radius of curvature parameters of each vector segment are extracted based on the laser engraving pattern; the curvature value is calculated based on the radius of curvature parameter. If the curvature value is greater than the preset curvature threshold, the vector segment corresponding to the curvature value is marked as an abrupt turning arc segment; if the line width parameter is less than or equal to the preset fine line width threshold, the vector segment corresponding to the line width parameter is marked as a narrow line arc segment. The areas containing abruptly turning arcs and narrow line arcs are marked as fine outline areas, and the remaining areas in the laser-engraved graphic that are inside the closed outline are marked as filled areas.

8. The laser engraving precision control method according to claim 6, characterized in that, The specific strategy for fine-scanning control of the contour region using laser power parameters is as follows: In the fine contour area, the laser power parameters are adjusted to a low power output state, specifically the laser output power is set to 20% to 40% of the rated power, and the single pulse energy is controlled at 0.05mJ to 0.20mJ; in the low power output state, the fine contour area is scanned according to the preset number of repeated scans, and the scan edge position data is recorded simultaneously. The edge coordinate sequence is extracted based on the scan edge position data; the edge coordinate sequence is matched and aligned with the corresponding contour coordinate sequence in the fine contour region, and the edge offset is calculated; the contour compensation displacement vector is generated based on the edge offset, and the scan is performed using the contour compensation displacement vector to complete the fine scan control strategy.

9. The laser engraving precision control method according to claim 6, characterized in that, The specific method for using laser power parameters to employ a rapid scanning control strategy for the filling area is as follows: In the filling area, the laser power parameters are adjusted to a medium-high power output value, specifically, the laser output power is set to 50% to 80% of the rated power, and the single pulse energy is controlled at 0.30mJ to 0.80mJ; the pulse spacing parameter is set using the medium-high power output value; the filling area is scanned according to the pulse spacing parameter, and the engraving depth data is recorded; The actual removal amount is calculated based on the engraving depth data; the depth deviation value is determined based on the actual removal amount; laser power adjustment parameters are generated based on the depth deviation value, and scanning control commands are generated using the laser power adjustment parameters; fast scanning control is executed according to the scanning control commands to complete the fast scanning control strategy.

10. A laser engraving precision control system, characterized in that, For performing the laser engraving precision control method as described in claim 1, the laser engraving precision control system includes: The trajectory generation module is used to acquire the parameters of the material to be laser-engraved and the laser engraving pattern; and to generate a laser scanning trajectory based on the parameters of the material to be laser-engraved and the laser engraving pattern. The laser engraving simulation module is used to perform laser engraving simulation according to the laser scanning trajectory and simultaneously acquire the actual coordinates of the laser focus; it also generates the laser engraving edge contour based on the actual coordinates of the laser focus. The precision control module is used to calculate the positional deviation value between the laser-engraved edge contour and the laser scanning trajectory; obtain the corresponding laser power parameters based on the positional deviation value; perform zoned precision control based on the laser power parameters and the laser-engraved graphic, and record the compensation laser engraving precision.

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