An online monitoring and adjustment system for laser processing

Abstract

The present invention relates to the field of laser processing technology, and more specifically to an online monitoring and adjustment system for laser processing. The system includes a data acquisition module, a parameter adjustment prejudgment module, an importance acquisition module, and a related parameter adjustment module. The modules cooperate with each other to obtain relevant data during the laser processing process to determine whether the parameter adjustment prejudgment conditions are met. If the parameter adjustment prejudgment conditions are met, an importance correction value for the parameter adjustment is determined. Then, based on the difference between the actual ambient temperature data and the theoretical ambient temperature data at the current processing position, and in combination with the importance correction value for the parameter adjustment, the laser processing-related parameters are adjusted. The present invention determines the importance correction value for the parameter adjustment by considering the influence of the heat-affected zone, and then adjusts the laser processing-related parameters, thereby effectively improving the accuracy of laser processing control.

Description

Technical Field

[0001] The present invention relates to the technical field of laser processing, and in particular to an online monitoring and regulating system for laser processing. Background Art

[0002] Laser processing is a technology that uses high-energy-density laser beams to process materials, including cutting, welding, marking, drilling, and other processes. This processing method has the advantages of high precision, high efficiency, and non-contact, which can reduce material waste and lower costs. It is also highly adaptable and can process a variety of materials, including those with high hardness, high brittleness, and high melting points.

[0003] In the prior art, parameters in laser processing are primarily determined through theoretical models. These models determine relevant parameters, such as the laser cutting speed and spot size, based on the laser intensity and the properties of the material being processed. Laser processing is then completed based on these parameters. However, this laser processing process presents the following problems: First, because the quality of actual laser processing is affected not only by the parameters but also by factors such as ambient temperature, humidity, and material properties, discrepancies arise between the processing model obtained under theoretical laser processing parameters and the actual processing model. Second, because actual laser processing generates heat, forming a heat-affected zone (HAZ), the presence of the HAZ can interfere with processing quality, precision, and efficiency. Therefore, how to monitor and adjust the relevant parameters in the laser processing process in real time to improve the accuracy of laser processing control, rather than simply controlling the parameters of the laser processing using determined theoretical parameters, has become an urgent issue in laser processing. Summary of the Invention

[0004] The purpose of the present invention is to provide an online monitoring and adjustment system for laser processing, which is used to solve the problem that the existing laser processing parameter control is directly performed using determined theoretical parameters, resulting in poor laser processing control accuracy.

[0005] To solve the above technical problems, in a first aspect, the present invention provides an online monitoring and adjustment system for laser processing, the system comprising:

[0006] A data acquisition module is used to acquire relevant data during the laser processing process, wherein the relevant data includes theoretical processing parameters and actual processing parameters at different processing positions on the processing path, actual historical temperature data and theoretical historical temperature data, and actual ambient temperature data and theoretical ambient temperature data;

[0007] The parameter adjustment prediction module is used to determine whether the parameter adjustment prediction conditions are met based on the difference between the actual processing parameters and the theoretical processing parameters of the current processing position;

[0008] The importance acquisition module is configured to: if the parameter adjustment pre-judgment condition is met, determine the importance of the parameter adjustment based on the difference between the theoretical and actual processing parameters at the current processing position, and in combination with the difference between the actual and theoretical historical temperature data of the heat-affected zone at the current processing position; determine a correction value of the importance of the parameter adjustment based on the importance of the parameter adjustment and in combination with changes in the processing path near the current processing position;

[0009] The relevant parameter adjustment module is used to adjust the laser processing related parameters according to the difference between the actual ambient temperature data and the theoretical ambient temperature data of the current processing position and in combination with the importance correction value of the parameter adjustment.

[0010] In conjunction with the first aspect above, in some possible implementations, the parameter adjustment prediction module is configured to:

[0011] Obtaining a theoretical processing parameter vector composed of different types of theoretical processing parameters of the current processing position, and an actual processing parameter vector composed of different types of actual processing parameters of the current processing position;

[0012] determining the necessity of parameter adjustment according to the difference between the theoretical processing parameter vector and the actual processing parameter vector;

[0013] The parameter adjustment necessity is compared with a set necessity threshold. If the parameter adjustment necessity is greater than the set necessity threshold, it is determined that the parameter adjustment prejudgment condition is met; otherwise, it is determined that the parameter adjustment prejudgment condition is not met.

[0014] In conjunction with the first aspect above, in some possible implementations, the importance acquisition module is configured to:

[0015] Dividing all temperature values ​​in the actual historical temperature data of the current processing position according to each set temperature range to obtain first temperature groups affected by the heat-affected zone, and dividing all temperature values ​​in the theoretical historical temperature data of the current processing position to obtain second temperature groups affected by the heat-affected zone, each first temperature group corresponding to one second temperature group;

[0016] The first temperature group with the largest temperature value among the first temperature groups is selected as the target first temperature group. The importance of parameter adjustment is determined based on the necessity of parameter adjustment, combined with the difference in heat-affected zone impact time between each first temperature group and its corresponding second temperature group, and the difference between the temperature value in the target first temperature group and the theoretical laser processing temperature.

[0017] In conjunction with the first aspect above, in some possible implementations, the importance acquisition module is configured to:

[0018] Determine a reference weight corresponding to each first temperature group according to the temperature values ​​in each first temperature group, wherein a larger temperature value in the first temperature group corresponds to a larger reference weight;

[0019] performing weighted addition of the heat-affected zone impact time differences between each of the first temperature groups and its corresponding second temperature group according to the reference weight to obtain a possibility of machining abnormality;

[0020] Determine the absolute value of the difference between the average temperature of the target first temperature group and the theoretical laser processing temperature, determine the necessity of parameter adjustment and the product of the absolute value of the difference, and obtain the difference between actual processing and theoretical processing;

[0021] The product of the machining abnormality possibility and the difference between the actual machining and the theoretical machining is normalized to obtain the importance of parameter adjustment.

[0022] In conjunction with the first aspect above, in some possible implementations, the importance acquisition module is configured to:

[0023] Each of the first temperature groups and each of the second temperature groups is regarded as a temperature group to be analyzed, a time interval between a maximum temperature value and a minimum temperature value in the temperature group to be analyzed is determined, and the time interval is regarded as a heat affected zone impact time of the temperature group to be analyzed.

[0024] In conjunction with the first aspect above, in some possible implementations, the importance acquisition module is configured to:

[0025] Determining a neighboring area of ​​a current processing position, and determining a path length of a local path segment of a processing path after the current processing position that is located in the neighboring area;

[0026] The importance of the parameter adjustment is corrected according to the path length and whether the processing path after the current processing position undergoes a path change in the adjacent area to obtain a parameter adjustment importance correction value.

[0027] In conjunction with the first aspect above, in some possible implementations, the importance acquisition module is configured to:

[0028] If the machining path after the current machining position does not undergo a path change in the adjacent area, the significance level of the heat-affected zone superposition effect is set to a fixed value; if the machining path after the current machining position undergoes a path change in the adjacent area, the significance level of the heat-affected zone superposition effect greater than the fixed value is determined based on the angle of change in the extension direction of the machining path before and after the path change;

[0029] The product value of the path length, the significance of the superposition effect of the heat-affected zone, and the importance of the parameter adjustment is determined, and the product value is normalized to obtain a correction value of the importance of the parameter adjustment.

[0030] In conjunction with the first aspect above, in some possible implementations, the importance acquisition module is configured to:

[0031] The fixed value is 1, and the extension direction change angle of the processing path after the current processing position before and after the path changes for the first time in the adjacent area is used as the exponent of the exponential function to map the extension direction change angle, and the function value of the exponential function is used as the significance degree of the superposition effect of the heat affected zone greater than the fixed value.

[0032] In conjunction with the first aspect above, in some possible implementations, the relevant parameter adjustment module is configured to:

[0033] Dividing all temperature values ​​in the actual ambient temperature data of the current processing position according to each set temperature range to obtain each third temperature group affected by the heat-affected zone, and dividing all temperature values ​​in the theoretical ambient temperature data of the current processing position to obtain each fourth temperature group affected by the heat-affected zone;

[0034] Select the third temperature group with the largest temperature value among all third temperature groups as the target third temperature group, and select the fourth temperature group with the largest temperature value among all fourth temperature groups as the target fourth temperature group;

[0035] determining an error in the proportion of the affected surrounding area according to a difference in area between an actual affected surrounding area of ​​the current processing position corresponding to the target third temperature group and a theoretical affected surrounding area of ​​the current processing position corresponding to the target fourth temperature group;

[0036] Determining a parameter adjustment characteristic value according to the error in the proportion of the affected surrounding area and the correction value of the importance of the parameter adjustment;

[0037] Laser processing related parameters are adjusted based on the error in the proportion of the affected surrounding area and the parameter adjustment characteristic value, and combined with the area difference between the actual affected surrounding area of ​​the current processing position corresponding to the target third temperature group and the theoretical affected surrounding area of ​​the current processing position corresponding to the target fourth temperature group.

[0038] In conjunction with the first aspect above, in some possible implementations, the relevant parameter adjustment module is configured to:

[0039] If the error in the proportion of the affected surrounding area is greater than the set proportion error threshold, and the difference between the area of ​​the actual affected surrounding area of ​​the current processing position corresponding to the target third temperature group and the area of ​​the theoretical affected surrounding area of ​​the current processing position corresponding to the target fourth temperature group is greater than the first set difference threshold, and the first set difference threshold is greater than 0, then according to the parameter adjustment characteristic value, the laser aperture and the laser movement speed are controlled to be reduced, and the emission of the cooling gas is increased. The larger the parameter adjustment characteristic value, the greater the adjustment of the laser aperture, the laser movement speed, and the emission of the cooling gas;

[0040] If the error in the proportion of the affected surrounding area is greater than the set proportion error threshold, and the difference between the area of ​​the actual affected surrounding area of ​​the current processing position corresponding to the target third temperature group and the area of ​​the theoretical affected surrounding area of ​​the current processing position corresponding to the target fourth temperature group is less than the second set difference threshold, and the second set difference threshold is less than 0, then the parameter adjustment characteristic value is adjusted according to the control to increase the laser aperture and the laser movement speed. The larger the parameter adjustment characteristic value, the greater the adjustment amount of the laser aperture and the laser movement speed.

[0041] To solve the above technical problems, in a second aspect, the present invention further provides an online monitoring and adjustment method for laser processing, the method comprising:

[0042] Acquiring relevant data during the laser processing process, the relevant data including theoretical processing parameters and actual processing parameters at different processing positions on the processing path, actual historical temperature data and theoretical historical temperature data, and actual ambient temperature data and theoretical ambient temperature data;

[0043] According to the difference between the actual processing parameters and the theoretical processing parameters of the current processing position, it is judged whether the parameter adjustment pre-judgment conditions are met;

[0044] If the parameter adjustment pre-judgment condition is met, the importance of the parameter adjustment is determined based on the difference between the theoretical processing parameters and the actual processing parameters at the current processing position, and in combination with the difference between the actual historical temperature data affected by the heat-affected zone at the current processing position and the theoretical historical temperature data; based on the importance of the parameter adjustment and in combination with the change of the processing path near the current processing position, a correction value of the importance of the parameter adjustment is determined;

[0045] According to the difference between the actual ambient temperature data and the theoretical ambient temperature data of the current processing position, and in combination with the importance correction value of the parameter adjustment, the laser processing related parameters are adjusted.

[0046] To address the above technical issues, in a third aspect, the present invention further provides an online monitoring and adjustment device for laser processing, comprising a memory and a processor. The memory is configured to store executable program code, and the processor is configured to retrieve and execute the executable program code from the memory, causing the device to execute the module implementation steps of the above-mentioned first aspect or any possible implementation of the first aspect.

[0047] In order to solve the above technical problems, in the fourth aspect, the present invention also provides a computer program product, which includes: computer program code, when the computer program code is run on a computer, it enables the computer to execute the module implementation steps in the above first aspect or any possible implementation method of the first aspect.

[0048] In order to solve the above technical problems, in the fifth aspect, the present invention also provides a computer-readable storage medium, which stores computer program code. When the computer program code is run on a computer, the computer executes the module implementation steps in the above-mentioned first aspect or any possible implementation method of the first aspect.

[0049] The present invention has the following beneficial effects: by comparing actual processing parameters with theoretical processing parameters, it is possible to predict whether it is necessary to adjust the parameters related to laser processing, and when it is necessary to adjust the parameters related to laser processing, the importance of the parameter adjustment is determined by considering the influence of the heat-affected zone and the difference between the actual influence and the theoretical influence. At the same time, the different influences of the heat-affected zone on the laser processing of different processing paths are taken into consideration, and then the importance correction value of the parameter adjustment is determined according to the importance of the parameter adjustment and the changes in the processing path near the current processing position. Finally, according to the difference between the actual ambient temperature data and the theoretical ambient temperature data of the current processing position and the importance correction value of the parameter adjustment, the laser processing-related parameters are adjusted, thereby minimizing the adverse effects of the heat-affected zone as much as possible, achieving the adjustment of the laser processing parameters, and effectively improving the accuracy of laser processing control. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] Figure 1 Schematic diagram of the structure of an online monitoring and adjustment system for laser processing according to an embodiment of the present invention;

[0052] Figure 2 This is a flowchart of the steps of an online monitoring and adjustment method for laser processing according to an embodiment of the present invention;

[0053] Figure 3 Schematic diagrams of several processing paths in the laser cutting process according to an embodiment of the present invention;

[0054] Figure 4 A schematic diagram of a machining path change according to an embodiment of the present invention;

[0055] Figure 5 The figure is a structural diagram of an online monitoring and adjustment device for laser processing according to an embodiment of the present invention. DETAILED DESCRIPTION

[0056] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0057] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0058] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0059] As used herein, the term "including" and its variations are open-ended, i.e., "including but not limited to." The term "based on" means "based, at least in part, on." The term "one embodiment" means "at least one embodiment," the term "another embodiment" means "at least one additional embodiment," and the term "some embodiments" means "at least some embodiments." Other terms are defined in the following description.

[0060] It should be noted that the concepts of "first" and "second" mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0061] Although operations or steps are described in a particular order in the drawings in the embodiments of the present invention, this should not be understood as requiring that these operations or steps be performed in the particular order shown or in a serial order, or that all of the operations or steps shown be performed to obtain a desired result. In the embodiments of the present invention, these operations or steps may be performed serially; they may also be performed in parallel; or a portion of these operations or steps may be performed.

[0062] At the same time, it is understood that the data involved in the technical solutions of the present invention (including but not limited to the data itself, the acquisition or use of the data) must comply with the requirements of relevant laws, regulations and relevant provisions. Unless otherwise defined, all technical and scientific terms used in this invention have the same meanings as those commonly understood by those skilled in the art to which this invention belongs, and all parameters or indicators in the formulas involved in this invention are normalized values ​​to eliminate dimension effects.

[0063] In order to solve the problem that the existing laser processing parameter control directly uses the determined theoretical parameters to control the laser processing, resulting in poor laser processing control accuracy, the embodiment of the present invention provides an online monitoring and adjustment system for laser processing. The system is essentially a software system. The software system is composed of modules that realize corresponding functions. The corresponding structural diagram is shown in FIG. Figure 1 The core of the system is to realize an online monitoring and adjustment method for laser processing. Each module in the system corresponds to each step in the method. The corresponding flowchart of the method is as follows: Figure 2 The following is a detailed introduction to each module of the system in combination with the specific steps in this method.

[0064] The data acquisition module is used to obtain relevant data during the laser processing process, including theoretical processing parameters and actual processing parameters of different processing positions on the processing path, actual historical temperature data and theoretical historical temperature data, and actual ambient temperature data and theoretical ambient temperature data.

[0065] During laser processing, the material to be processed is first selected. This embodiment uses the material to be cut as an example, and the laser cutting equipment and cutting tools are selected based on the material. A three-dimensional theoretical model of the part to be processed is then imported using computer-aided design (CAD). The laser processing path is then determined based on the theoretical model. CNC programming is then performed to obtain the processing parameters corresponding to each processing path, along with the associated graphical data. This graphical data is then transmitted to the laser machine. The laser processing device is activated, and the laser machine performs the laser processing of the material based on the graphical data. It should be understood that during CNC programming, since the same processing path corresponds to the same processing parameters, processing parameters can be obtained for different processing positions along that path. Processing parameters refer to the relevant parameters used during the laser processing of the material, including laser processing information such as processing depth and width. To distinguish them from the processing parameters for different processing positions along the processing path collected during the actual laser process, the processing parameters for different processing positions along each processing path, obtained through CNC programming based on the theoretical model, are referred to as theoretical processing parameters.

[0066] During the laser processing of materials based on the graphic data, the laser machine utilizes relevant sensors to collect processing parameters, including processing depth, processing width, and other laser processing information, at different processing locations along each processing path. These collected processing parameters are referred to as actual processing parameters. Furthermore, to facilitate subsequent adjustment of laser processing parameters, the temperature of different processing locations along each processing path is collected throughout the entire laser processing process. This allows for the acquisition of historical temperature data for each processing location along each processing path. This historical temperature data represents all temperature values ​​collected at each processing location from the start of laser processing until the laser processing reaches each processing location. Each temperature value corresponds to a specific time point, and these collected historical temperature data are referred to as actual historical temperature data. During the processing of different processing locations along each processing path, it is also necessary to obtain ambient temperature data for each processing location during the processing process. This ambient temperature data refers to the temperature value of each location within a set circular area centered on each processing location during the processing process. This temperature value reflects the overall temperature level of the surrounding locations at that processing location during the processing process. Correspondingly, based on various relevant data such as the characteristics of the cutting material, processing depth, processing width, processing path, laser temperature, etc., the laser cutting process of the material is modeled and simulated, and combined with the temperature diffusion model, the theoretical historical temperature data and theoretical ambient temperature data of each processing position on each processing path during the simulation process are obtained. The theoretical historical temperature data refers to all temperature values ​​of the processing position during the period from the start of laser processing to the processing of each processing position during the simulation process. Similarly, each temperature value corresponds to a time point. The theoretical ambient temperature data refers to the temperature value of each position point in the set circular area centered on the processing position during the processing of each processing position during the simulation process.

[0067] The parameter adjustment prediction module is used to determine whether the parameter adjustment prediction conditions are met based on the difference between the theoretical processing parameters and the actual processing parameters of the current processing position.

[0068] During the laser processing process, the heat-affected zone is an area with a higher temperature formed by the temperature influence of the laser cutting process on the surrounding area of ​​the cutting material. It is an inevitable influence in the laser processing and cutting process. At the same time, the laser processing and cutting process is also easily affected by many factors such as ambient temperature, humidity, and material properties. As a result, the optimal laser processing parameters obtained based on the three-dimensional theoretical model are not the optimal operating parameters in the actual processing process. Therefore, the parameters in the laser processing process need to be adjusted to improve the accuracy of laser processing control.

[0069] To determine whether laser processing parameters need to be adjusted, the actual processing data collected during the laser processing process is compared with the theoretical processing parameters. If the actual processing data is equal to or very close to the theoretical processing parameters, it means that the current laser processing situation meets the requirements of the three-dimensional theoretical model, and no adjustment of the laser processing parameters is required. Therefore, for any processing position currently being processed on the processing path, referred to as the current processing position, by analyzing the difference between the actual processing parameters and the theoretical processing parameters at that current processing position, it can be determined whether the parameter adjustment pre-judgment conditions are met.

[0070] Preferably, the parameter adjustment prediction module is used to: obtain a theoretical processing parameter vector composed of different types of theoretical processing parameters of the current processing position, and an actual processing parameter vector composed of different types of actual processing parameters of the current processing position; determine the necessity of parameter adjustment based on the difference between the theoretical processing parameter vector and the actual processing parameter vector; compare the necessity of parameter adjustment with a set necessity threshold, if the necessity of parameter adjustment is greater than the set necessity threshold, it is determined that the parameter adjustment prediction condition is met, otherwise it is determined that the parameter adjustment prediction condition is not met.

[0071] As an example, different types of theoretical processing parameters (i.e., theoretical processing depth, processing width, etc.) of the current processing position are arranged in the set order to obtain a theoretical processing parameter vector And arrange the different types of actual processing parameters of the current processing position (i.e. the actual collected processing depth, processing width and other parameters) according to the set arrangement order, so as to obtain an actual processing parameter vector The order of the settings can be set arbitrarily and is not limited here. For example, when different types of processing parameters are processing depth and processing width, the order of the settings can be: processing depth, processing width, or: processing width, processing depth. and the actual machining parameter vector Compare and determine the necessity of parameter adjustment:

[0072] ;

[0073] Where, Indicates the necessity of parameter adjustment; represents the actual processing parameter vector; represents the theoretical processing parameter vector; represents the standard normalization function; || || represents the vector modulus length symbol.

[0074] In the above formula, by calculating the actual processing parameter vector and theoretical processing parameter vector The modulus of the vector difference characterizes the difference between different types of theoretical processing parameters and actual processing parameters at the current processing position. By normalizing the modulus of the vector difference, the necessity of parameter adjustment is obtained. , the necessity of adjusting this parameter It reflects the difference between the theoretical processing effect and the actual processing effect. The greater the difference, the more necessary it is to adjust the relevant parameters of laser processing such as laser aperture, cutting speed, cooling gas emission and other parameters. Conversely, it means that the necessity of adjusting the relevant parameters of the laser is low.

[0075] Pre-set necessity threshold , the necessity threshold is set The specific value of can be reasonably set according to needs. In the embodiment of the present invention, the necessity threshold is set. During the laser processing of the material by the laser machine, the necessity of parameter adjustment corresponding to different processing positions on the processing path is obtained in real time. When the necessity of parameter adjustment is less than or equal to the set necessity threshold When the laser processing parameters such as laser aperture, cutting speed, cooling gas emission and other parameters do not need to be adjusted, the laser machine's initial parameters are maintained to cut the material. When the necessity of adjusting the parameters of a certain processing position during the cutting process is greater than the set necessity threshold, When , it means that there is a big difference between the current cutting effect and the desired cutting effect, and the cutting effect is not ideal, so the relevant parameters of laser processing need to be adjusted.

[0076] Therefore, for any processing position currently being processed on the processing path, that is, the current processing position, the necessity of adjusting the calculated parameters and setting a threshold of necessity Compare and see if the parameter adjustment is necessary Greater than the set necessity threshold , indicating that the relevant parameters of the laser processing may need to be adjusted, then it is determined that the parameter adjustment pre-judgment conditions are met; otherwise, it indicates that the relevant parameters of the laser processing do not need to be adjusted at present, then it is determined that the parameter adjustment pre-judgment conditions are not met.

[0077] The importance acquisition module is used to: if the parameter adjustment pre-judgment conditions are met, determine the importance of the parameter adjustment based on the difference between the theoretical processing parameters and the actual processing parameters at the current processing position, and in combination with the difference between the actual historical temperature data affected by the heat-affected zone at the current processing position and the theoretical historical temperature data; determine the importance correction value of the parameter adjustment based on the importance of the parameter adjustment and in combination with the changes in the processing path near the current processing position.

[0078] When it is determined that the parameter adjustment pre-judgment conditions are met, that is, the relevant parameters of the laser processing may need to be adjusted, it is considered that the heat-affected zone is an inevitable influence in the laser processing process, and the heat generated during the cutting process will definitely affect the non-processing area around the material. However, due to the influence of material and distance, the degree of influence on different positions of the heat-affected zone is different. Therefore, it is not possible to rely solely on the processing effect to determine whether the relevant parameters of the laser processing need to be adjusted.

[0079] During the laser cutting movement, since the laser cutting of each processing position will have a temperature impact on the position within its heat-affected zone, for the processing position to be analyzed that is in the heat-affected zone of other processing positions, the temperature of the processing position to be analyzed will gradually increase with time. Therefore, by analyzing the temperature data of the processing position to be analyzed, the heat-affected zone impact time of the processing position to be analyzed in different temperature ranges is obtained. The heat-affected zone impact time reflects the duration of the temperature impact of the heat-affected zone of the processing position to be analyzed on the processing position to be analyzed. Although the heat-affected zone will interfere with laser processing, the heat-affected zone impact time of the heat-affected zone needs to be reduced as much as possible. However, the smaller the heat-affected zone impact time is, the better. Too small a heat-affected zone impact time will affect cutting quality and cutting efficiency. This is because when there is insufficient heat, the cutting ability of the material will be significantly weakened. Therefore, the heat-affected zone impact time needs to be controlled within an appropriate range. To this end, based on the theoretical temperature data of the current processing position, the theoretical heat-affected zone impact time in different temperature ranges is obtained, and the difference between the actual heat-affected zone impact time of the processing position to be analyzed and the theoretical heat-affected zone impact time is compared. At the same time, the difference between the actual temperature data and the theoretical temperature data in the highest temperature range is compared, and the necessity of parameter adjustment is combined. , analyze the importance of adjusting the relevant parameters of laser processing to determine whether the relevant parameters of the laser machine need to be adjusted, so as to reduce the interference of the heat affected zone on the actual processing process, and at the same time ensure the quality and efficiency of laser processing.

[0080] Preferably, the importance acquisition module is used to:

[0081] Dividing all temperature values ​​in the actual historical temperature data of the current processing position according to each set temperature range to obtain first temperature groups affected by the heat-affected zone, and dividing all temperature values ​​in the theoretical historical temperature data of the current processing position to obtain second temperature groups affected by the heat-affected zone, each first temperature group corresponding to one second temperature group;

[0082] The first temperature group with the largest temperature value among the first temperature groups is selected as the target first temperature group. The importance of parameter adjustment is determined based on the necessity of parameter adjustment, combined with the difference in heat-affected zone impact time between each first temperature group and its corresponding second temperature group, and the difference between the temperature value in the target first temperature group and the theoretical laser processing temperature.

[0083] As an example, according to the temperature effect of laser cutting on the heat affected zone, various set temperature ranges are pre-set. The specific range of each set temperature range can be reasonably set according to needs, and this solution does not limit it. In the embodiment of the present invention, 、 、 、 As each set temperature range. Based on the determined set temperature ranges, all temperature values ​​in the actual historical temperature data of the current processing position are divided. Specifically, the temperature values ​​within the same set temperature range are grouped as a first temperature group. This allows for the generation of first temperature groups affected by the heat-affected zone corresponding to each set temperature range, with each set temperature range corresponding to a first temperature group. Because all temperature values ​​in the actual historical temperature data of the current processing position exhibit a gradually increasing trend, the minimum temperature value in each first temperature group corresponds to the earliest time point, while the maximum temperature value corresponds to the latest time point. Similarly, based on the determined set temperature ranges, all temperature values ​​in the theoretical historical temperature data of the current processing position are divided. This allows for the generation of second temperature groups affected by the heat-affected zone corresponding to each set temperature range, with each set temperature range corresponding to a second temperature group. Similarly, because all temperature values ​​in the theoretical historical temperature data of the current processing position exhibit a gradually increasing trend, the minimum temperature value in each second temperature group corresponds to the earliest time point, while the maximum temperature value corresponds to the latest time point. Since each set temperature range corresponds to both a first temperature group and a second temperature group, each first temperature group corresponds to a second temperature group.

[0084] The first temperature group with the largest temperature value is determined, and this first temperature group with the largest temperature value is used as the target first temperature group. Furthermore, the importance of parameter adjustment is determined based on the necessity of parameter adjustment, the difference in heat-affected zone impact time between each first temperature group and its corresponding second temperature group, and the difference between the temperature values ​​in the target first temperature group and the theoretical laser processing temperature. The greater the necessity of parameter adjustment, the greater the difference in heat-affected zone impact time between each first temperature group and its corresponding second temperature group, and the greater the difference between the temperature values ​​in the target first temperature group and the theoretical laser processing temperature, the greater the importance of the corresponding parameter adjustment.

[0085] Preferably, the importance acquisition module is used to:

[0086] Determine a reference weight corresponding to each first temperature group according to the temperature values ​​in each first temperature group, wherein a larger temperature value in the first temperature group corresponds to a larger reference weight;

[0087] performing weighted addition of the heat-affected zone impact time differences between each of the first temperature groups and its corresponding second temperature group according to the reference weight to obtain a possibility of machining abnormality;

[0088] Determine the absolute value of the difference between the average temperature of the target first temperature group and the theoretical laser processing temperature, determine the necessity of parameter adjustment and the product of the absolute value of the difference, and obtain the difference between actual processing and theoretical processing;

[0089] The product of the machining abnormality possibility and the difference between the actual machining and the theoretical machining is normalized to obtain the importance of parameter adjustment.

[0090] Specifically, the reference weight corresponding to each first temperature group is determined based on the temperature values ​​in each first temperature group. The larger the temperature value in the first temperature group, the larger the corresponding reference weight. In this embodiment, the first temperature groups are sorted in descending order of the temperature values ​​in each first temperature group to obtain a first temperature group sequence, and the reciprocal of the sequence number of each first temperature group in the first temperature group sequence is used as the reference weight corresponding to the first temperature group. At the same time, since each temperature value in each first temperature group and second temperature group corresponds to a time point, and the minimum temperature value in each temperature group corresponds to the earliest time point, and the maximum temperature value corresponds to the latest time point, each first temperature group and each second temperature group can be used as a temperature group to be analyzed, and the time interval between the maximum temperature value and the minimum temperature value in the temperature group to be analyzed can be determined. The time interval is the difference between the time points corresponding to the maximum temperature value and the minimum temperature value, and the time interval is used as the heat affected zone impact time of the temperature group to be analyzed.

[0091] Using the above method, the heat-affected zone impact time of each first temperature group and the second temperature group can be determined. Based on the reference weight, the difference in the heat-affected zone impact time between each first temperature group and its corresponding second temperature group is weighted and added to obtain the probability of processing anomaly. Based on the necessity of parameter adjustment and the probability of processing anomaly, and in combination with the difference between the average temperature of the target first temperature group and the theoretical laser processing temperature, the importance of parameter adjustment is determined:

[0092] ;

[0093] ;

[0094] ;

[0095] Where, Indicates the possibility of processing abnormality; Indicates the The heat affected zone impact time of each first temperature group; Indicates the Impact time of the heat-affected zone of the second temperature group corresponding to the first temperature group; Indicates the Reference weights corresponding to the first temperature groups; Indicates the total number of the first temperature group. In the embodiment of the present invention, ; Indicates the necessity of parameter adjustment; Indicates the average temperature of the target first temperature group; Indicates the theoretical laser processing temperature; Indicates the difference between actual processing and theoretical processing; represents the standard normalization function; Indicates the importance of parameter adjustment.

[0096] In the above formula, Indicates the The reference weight corresponding to each first temperature group is determined by arranging each first temperature group in descending order according to the temperature value in each first temperature group, and taking the inverse of the serial number of each first temperature group obtained after arrangement. The smaller the serial number, the closer the current processing position is to the laser cutting area, the higher its temperature value, and the higher its importance in the heat-affected zone. Therefore, the weight of the corresponding heat-affected zone impact time difference is greater. If the difference in the heat-affected zone impact time between the most important target first temperature group and its corresponding second temperature group in the heat-affected zone is greater, it means that the possibility of cutting abnormality in the current laser processing process is greater. On the contrary, if the first temperature group is at the edge of the heat-affected zone (that is, the first temperature group corresponding to the minimum temperature value), although there is a large difference between the heat-affected zone impact time of the first temperature group and its corresponding second temperature group, the impact on actual laser cutting is small, and the corresponding weight is smaller. The weighted addition of the heat-affected zone impact time difference between each first temperature group and its corresponding second temperature group is performed to obtain the possibility of abnormality in the current cutting, that is, the possibility of processing abnormality. , the possibility of abnormal processing The difference in the heat affected zone impact time of the first temperature group in the heat affected zone is reflected. The average temperature of the first temperature group with the highest temperature in the laser cutting process is used. and theoretical laser processing temperature Comparison shows that the difference between the two reflects the accuracy of the processing. The greater the difference, the smaller the accuracy, and the greater the difference between the actual processing model and the theoretical model. At the same time, combined with the necessity of parameter adjustment, the difference between the actual processing and the theoretical processing is obtained. , the difference between actual processing and theoretical processing It reflects the difference between the laser processing process and the theoretical model. Finally, by calculating the difference between the actual processing and the theoretical processing and the possibility of processing abnormalities The product is normalized and the difference between actual processing and theoretical processing is used to and the possibility of processing abnormalities To jointly reflect the importance of laser processing parameter adjustment .

[0097] Through the above steps, the influence of the heat affected zone generated at the cutting position on the laser processing is determined, and the importance of the corresponding parameter adjustment is obtained. However, during the laser processing, due to the different processing paths, Figure 3Schematic diagrams of several processing paths during the laser cutting process are shown, which result in different degrees of influence of the heat-affected zone on the laser processing at different processing positions. For example, if the processing path as a whole is curved or has a vertex formed by a clear path direction change, the heat-affected zone will have a longer impact on that position, while the heat-affected zone will have a shorter impact on the processing position on the straight line. As a result, the difference in the heat-affected zone impact time obtained above cannot well describe the superposition phenomenon caused by the heat-affected zone, which in turn leads to inaccurate importance. Therefore, the importance of the parameter adjustment calculated above cannot be directly used to adjust the relevant parameters of the laser processing. Otherwise, the heat-affected zone generated by the previous processing process will interfere with the subsequent processing position. The superposition effect of the heat-affected zone on the straight laser processing path is not obvious, but it has a significant superposition effect on the processing position with obvious vertex features.

[0098] Therefore, based on the changes in the machining path near the current machining position, the calculated parameter adjustment importance is corrected to obtain a parameter adjustment importance correction value. If the machining path does not change near the current machining position, the corresponding heat-affected zone has a relatively small superposition effect at the subsequent machining position. If the machining path changes near the current machining position, the superposition phenomenon of the heat-affected zone at the subsequent machining position is relatively more serious, and the need for adjusting the laser machining parameters is relatively higher, that is, the corrected importance should be greater.

[0099] Preferably, the importance acquisition module is used to:

[0100] Determining a neighboring area of ​​a current processing position, and determining a path length of a local path segment of a processing path after the current processing position that is located in the neighboring area;

[0101] The importance of the parameter adjustment is corrected according to the path length and whether the processing path after the current processing position undergoes a path change in the adjacent area to obtain a parameter adjustment importance correction value.

[0102] As an example, a circle is drawn with the current processing position as the center. The radius R of the circle can be selected as needed and is not limited here. The determined circular area is used as the adjacent area of ​​the current processing position. The path length of the local path segment of the processing path after the current processing position located in this adjacent area can be determined. Then, based on the path length and whether the processing path after the current processing position has undergone path changes within this adjacent area, the importance of the parameter adjustment is corrected to obtain a parameter adjustment importance correction value.

[0103] Preferably, the importance acquisition module is used to:

[0104] If the machining path after the current machining position does not undergo a path change in the adjacent area, the significance level of the heat-affected zone superposition effect is set to a fixed value; if the machining path after the current machining position undergoes a path change in the adjacent area, the significance level of the heat-affected zone superposition effect greater than the fixed value is determined based on the angle of change in the extension direction of the machining path before and after the path change;

[0105] The product value of the path length, the significance of the superposition effect of the heat-affected zone, and the importance of the parameter adjustment is determined, and the product value is normalized to obtain a correction value of the importance of the parameter adjustment.

[0106] Specifically, if there is no change in the processing path after the current processing position in the adjacent area of ​​the current processing position, that is, the direction of the processing path has not changed, and the superposition effect of the heat-affected zone of the current processing position on the subsequent processing position is relatively small, then the significance of the superposition effect of the heat-affected zone is set to a fixed value of 1. If there is a change in the processing path after the current processing position in the adjacent area of ​​the current processing position, that is, the direction of the processing path has changed, as the angle of change in the extension direction of the processing path before and after the internal path changes increases, the superposition effect of the subsequent processing path affected by the heat-affected zone is more significant. Therefore, the greater the importance of adjusting the relevant parameters, the significance of the heat-affected zone superposition effect greater than the fixed value 1 is determined based on the angle of change in the extension direction of the processing path before and after the path changes after the current processing position in the adjacent area, and the greater the angle of change in the extension direction, the greater the significance of the heat-affected zone superposition effect should be. As Figure 4 As shown, in the vicinity of the current processing position P, the extension direction of the processing path after the current processing position P changes from the direction indicated by the arrow of line segment l1 to the direction indicated by the arrow of line segment l2. The angle of change of the extension direction of the processing path in the vicinity of the processing position P is It should be understood that if the processing path after the current processing position P undergoes two or more path changes in the adjacent area, the extension direction change angle at this time should be the extension direction change angle of the processing path corresponding to the first path change of the processing path after the current processing position.

[0107] In the embodiment of the present invention, the importance of parameter adjustment is corrected based on the path length and the significance of the superposition effect of the heat-affected zone, and a correction value of the importance of parameter adjustment is obtained:

[0108] ;

[0109] Where, Indicates the importance correction value of parameter adjustment; Indicates the significance of the superposition effect in the heat affected zone. Indicates the angle of change in the extension direction of the machining path after the current machining position before and after the path changes in the adjacent area. represents an exponential function with the natural constant e as the base; Indicates the importance of parameter adjustment; The path length of the local path segment of the machining path after the current machining position that is located in the adjacent area; represents the standard normalization function;

[0110] In the above formula, the significance of the heat-affected zone superposition effect is determined by the angle of change in the extension direction of the machining path before and after the path changes in the adjacent area of ​​the current machining position. When the subsequent processing path does not change in the adjacent area of ​​the current processing position, the extension direction change angle of the processing path can be regarded as 0. At this time, the significance of the superposition effect of the heat affected zone is fixed at 1. The path length of the local path segment of the machining path after the current machining position that is located in the vicinity of the current machining position The importance of parameter adjustment is corrected to obtain the correction value of the importance of parameter adjustment. The larger the value, the longer the path length of the local path segment of the machining path after the current machining position is in the vicinity of the current machining position. The larger it is, the more obvious the superposition effect of the heat-affected zone is, the greater the temperature impact of the processing path before the path change on the processing path after the path change, and the greater the value of the correction value of the importance of parameter adjustment should be.

[0111] The relevant parameter adjustment module is used to adjust the laser processing related parameters according to the difference between the actual ambient temperature data and the theoretical ambient temperature data of the current processing position and in combination with the importance correction value of the parameter adjustment.

[0112] Based on the actual ambient temperature data of the current processing position, the actual area of ​​the area where the temperature is higher in the heat-affected zone of the processing position is formed on the processing material can be obtained. At the same time, based on the theoretical ambient temperature data of the current processing position, the theoretical area of ​​the area where the temperature is higher in the heat-affected zone of the processing position is formed on the processing material can be obtained. According to the difference between the two area sizes, it can be judged whether the scope of the actual processing area is too large or too small, so as to determine whether it is necessary to adjust the laser processing related parameters. When it is necessary to adjust the laser processing related parameters, the amplitude of the laser processing related parameter adjustment can be determined in combination with the importance correction value of the parameter adjustment.

[0113] Preferably, the relevant parameter adjustment module is used to:

[0114] Dividing all temperature values ​​in the actual ambient temperature data of the current processing position according to each set temperature range to obtain each third temperature group affected by the heat-affected zone, and dividing all temperature values ​​in the theoretical ambient temperature data of the current processing position to obtain each fourth temperature group affected by the heat-affected zone;

[0115] Select the third temperature group with the largest temperature value among all third temperature groups as the target third temperature group, and select the fourth temperature group with the largest temperature value among all fourth temperature groups as the target fourth temperature group;

[0116] determining an error in the proportion of the affected surrounding area according to a difference in area between an actual affected surrounding area of ​​the current processing position corresponding to the target third temperature group and a theoretical affected surrounding area of ​​the current processing position corresponding to the target fourth temperature group;

[0117] Determining a parameter adjustment characteristic value according to the error in the proportion of the affected surrounding area and the correction value of the importance of the parameter adjustment;

[0118] Laser processing related parameters are adjusted based on the error in the proportion of the affected surrounding area and the parameter adjustment characteristic value, and combined with the area difference between the actual affected surrounding area of ​​the current processing position corresponding to the target third temperature group and the theoretical affected surrounding area of ​​the current processing position corresponding to the target fourth temperature group.

[0119] As an example, according to the various set temperature ranges determined above, that is, 、 、 、 , all temperature values ​​in the actual ambient temperature data of the current processing position are divided to obtain third temperature groups affected by the heat-affected zone, and all temperature values ​​in the theoretical ambient temperature data of the current processing position are divided to obtain fourth temperature groups affected by the heat-affected zone. Since the steps of obtaining the third and fourth temperature groups are identical to the steps of obtaining the first and second temperature groups described above, they will not be repeated here. The third temperature group with the largest temperature value among the third temperature groups is selected as the target third temperature group, and the fourth temperature group with the largest temperature value among the fourth temperature groups is selected as the target fourth temperature group. Since each temperature value in the actual ambient temperature data corresponds to a point within a set circular area centered on the current processing position, an area formed by the points corresponding to all temperature values ​​in the target third temperature group can be determined, and this area can be used as the actual affected area of ​​the current processing position corresponding to the target third temperature group. Similarly, an area formed by the points corresponding to all temperature values ​​in the target fourth temperature group can be determined, and this area can be used as the theoretical affected area of ​​the current processing position corresponding to the target fourth temperature group.

[0120] The error in the percentage of the affected surrounding area is determined based on the difference in area between the actual affected surrounding area of ​​the current processing position corresponding to the third target temperature group and the theoretical affected surrounding area of ​​the current processing position corresponding to the fourth target temperature group:

[0121] ;

[0122] Where, Indicates the error in the proportion of the surrounding area affected; Indicates the area of ​​the surrounding area actually affected by the current processing position corresponding to the third target temperature group; Indicates the area of ​​the surrounding region theoretically affected by the current processing position corresponding to the fourth target temperature group.

[0123] Then, according to the error affecting the proportion of the surrounding area and the correction value of the importance of the parameter adjustment, the parameter adjustment characteristic value is determined:

[0124] ;

[0125] Where, represents the parameter adjustment eigenvalue; Indicates the error in the proportion of the surrounding area affected; Indicates the importance correction value of parameter adjustment.

[0126] On this basis, according to the error in the proportion of the affected surrounding area and the parameter adjustment characteristic value, and combined with the area difference between the actual affected surrounding area of ​​the current processing position corresponding to the third target temperature group and the theoretical affected surrounding area of ​​the current processing position corresponding to the fourth target temperature group, the laser processing related parameters are adjusted.

[0127] Preferably, the relevant parameter adjustment module is used to:

[0128] If the error in the proportion of the affected surrounding area is greater than the set proportion error threshold, and the difference between the area of ​​the actual affected surrounding area of ​​the current processing position corresponding to the target third temperature group and the area of ​​the theoretical affected surrounding area of ​​the current processing position corresponding to the target fourth temperature group is greater than the first set difference threshold, and the first set difference threshold is greater than 0, then according to the parameter adjustment characteristic value, the laser aperture and the laser movement speed are controlled to be reduced, and the emission of the cooling gas is increased. The larger the parameter adjustment characteristic value, the greater the adjustment of the laser aperture, the laser movement speed, and the emission of the cooling gas;

[0129] If the error in the proportion of the affected surrounding area is greater than the set proportion error threshold, and the difference between the area of ​​the actual affected surrounding area of ​​the current processing position corresponding to the target third temperature group and the area of ​​the theoretical affected surrounding area of ​​the current processing position corresponding to the target fourth temperature group is less than the second set difference threshold, and the second set difference threshold is less than 0, then the parameter adjustment characteristic value is adjusted according to the control to increase the laser aperture and the laser movement speed. The larger the parameter adjustment characteristic value, the greater the adjustment amount of the laser aperture and the laser movement speed.

[0130] Specifically, a ratio error threshold is preset, and a specific value of the ratio error threshold can be reasonably set as needed. In the embodiment of the present invention, the value of the ratio error threshold is set to 0.05.

[0131] Will affect the error of the surrounding area ratio Compared with the set error threshold of 0.05, there are two situations:

[0132] 1. If it affects the error of the surrounding area Less than or equal to the set error threshold of 0.05, that is, , which means that when considering the influence of the heat-affected zone, the difference between the actual laser processing of the material and the theoretical model is small, and the temperature meets the processing requirements, so there is no need to adjust the parameters related to the operation of the laser processing.

[0133] 2. If it affects the error of the surrounding area Greater than the set error threshold of 0.05, that is, , it means that there is a big difference between the actual laser processing of the material and the theoretical model, and the relevant parameters in the laser processing process need to be adjusted as follows:

[0134] If the actual area of ​​the surrounding area affected by the current processing position corresponding to the third target temperature group The area of ​​the surrounding area theoretically affected by the current processing position corresponding to the fourth target temperature group The difference is greater than the first set difference threshold, that is, the actual area of ​​the surrounding area affected by the current processing position corresponding to the target third temperature group The area of ​​the surrounding area of ​​the theoretical impact of the current processing position corresponding to the fourth target temperature group is significantly larger than that of the target temperature group , it means that the actual processing area is too large and needs to be reduced. Therefore, the laser aperture is controlled to be reduced. The reduction of the laser aperture leads to a decrease in energy. At the same time, the laser movement speed is reduced to maintain balance. The adjustment amount of the laser aperture is equal to the difference between the current laser aperture and the minimum limit of the laser aperture and the parameter adjustment characteristic value. The adjustment amount of the laser moving speed is equal to the difference between the current laser moving speed and the minimum limit of the laser moving speed and the parameter adjustment characteristic value. At the same time, due to the large processing range, the heat affected zone is too large, so the heat affected zone should be reduced at this time, so the cooling gas discharge volume is controlled to increase, thereby reducing the interference of the heat affected zone and reducing the influence range of the heat affected zone. The adjustment amount of the cooling gas discharge volume, that is, the increase in the change amount, is equal to the difference between the maximum limit of the cooling gas discharge volume and the current cooling gas discharge volume and the parameter adjustment characteristic value. It should be understood that the first set difference threshold value is used to measure the area of ​​the surrounding area actually affected by the current processing position corresponding to the target third temperature group. Is it significantly larger than the theoretical impact area surrounding the current processing position corresponding to the target fourth temperature group? , while ensuring that the first set difference threshold is greater than 0, its specific value can be reasonably selected according to needs and is not specifically limited here.

[0135] If the actual area of ​​the surrounding area affected by the current processing position corresponding to the third target temperature group The area of ​​the surrounding area theoretically affected by the current processing position corresponding to the fourth target temperature group The difference is less than the second set difference threshold, that is, the actual area of ​​the surrounding area affected by the current processing position corresponding to the target third temperature group The area of ​​the surrounding area of ​​the theoretical impact of the current processing position corresponding to the target fourth temperature group is significantly smaller than that of the target fourth temperature group. , it means that the actual processing area is obviously too small, the heat affected zone is too small, and the processing of the material is not obvious. At this time, it is necessary to appropriately increase the heat affected zone for better processing. Therefore, the laser aperture is controlled to increase. The increase in the laser aperture causes the energy to rise and fall. At the same time, the laser movement speed is increased to maintain balance. The adjustment amount of the laser aperture, that is, the increase in the change amount, is equal to the difference between the maximum limit of the laser aperture and the current laser aperture and the parameter adjustment characteristic value. The adjustment amount of the laser moving speed is equal to the difference between the maximum limit of the laser moving speed and the current laser moving speed and the parameter adjustment characteristic value. It should be understood that the second set difference threshold value is used to measure the area of ​​the surrounding area actually affected by the current processing position corresponding to the target third temperature group. Is it significantly smaller than the area of ​​the theoretically affected area surrounding the current processing position corresponding to the target fourth temperature group? , while ensuring that the second set difference threshold is less than 0, its specific value can be reasonably selected according to needs and is not specifically limited here.

[0136] Continue laser processing according to the adjusted parameters, and repeat the above steps of determining whether the laser processing parameters need to be adjusted, and adjusting the parameters when necessary, for each processing position on the processing path during the processing until the laser processing process is completed.

[0137] Based on the same inventive concept, an embodiment of the present invention also provides an online monitoring and adjustment method for laser processing, such as Figure 2 As shown, the method includes:

[0138] Acquiring relevant data during the laser processing process, the relevant data including theoretical processing parameters and actual processing parameters at different processing positions on the processing path, actual historical temperature data and theoretical historical temperature data, and actual ambient temperature data and theoretical ambient temperature data;

[0139] According to the difference between the actual processing parameters and the theoretical processing parameters of the current processing position, it is judged whether the parameter adjustment pre-judgment conditions are met;

[0140] If the parameter adjustment pre-judgment condition is met, the importance of the parameter adjustment is determined based on the difference between the theoretical processing parameters and the actual processing parameters at the current processing position, and in combination with the difference between the actual historical temperature data affected by the heat-affected zone at the current processing position and the theoretical historical temperature data; based on the importance of the parameter adjustment and in combination with the change of the processing path near the current processing position, a correction value of the importance of the parameter adjustment is determined;

[0141] According to the difference between the actual ambient temperature data and the theoretical ambient temperature data of the current processing position, and in combination with the importance correction value of the parameter adjustment, the laser processing related parameters are adjusted.

[0142] Based on the same inventive concept, the embodiment of the present invention also provides an online monitoring and adjustment device for laser processing, such as Figure 5 As shown, the device includes: a memory 501, a processor 502, and a computer program 503 stored in the memory 501 and running on the processor 502, wherein when the processor 502 executes the computer program 503, the device can execute any of the module implementation steps in the online monitoring and adjustment system for laser processing introduced above.

[0143] In embodiments of the present invention, the functional modules of the device can be divided according to the exemplary module implementation steps in the above-mentioned system. For example, these modules can correspond to individual functional modules, or two or more functions can be integrated into a single processing module. The integrated modules can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and represents only a logical functional division. In actual implementation, other division methods may be used.

[0144] Based on the same inventive concept, an embodiment of the present invention also provides a computer program product, which includes: computer program code, which, when running on a computer, enables the computer to execute the module implementation steps in any one of the online monitoring and adjustment systems for laser processing introduced above.

[0145] Based on the same inventive concept, an embodiment of the present invention also provides a computer-readable storage medium, which stores computer program code. When the computer program code runs on a computer, the computer executes the module implementation steps in any one of the online monitoring and adjustment systems for laser processing introduced above.

[0146] It should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An online monitoring and adjustment system for laser processing, characterized in that: The system comprises: A data acquisition module is used to acquire relevant data during the laser processing process, wherein the relevant data includes theoretical processing parameters and actual processing parameters at different processing positions on the processing path, actual historical temperature data and theoretical historical temperature data, and actual ambient temperature data and theoretical ambient temperature data; The parameter adjustment prediction module is used to determine whether the parameter adjustment prediction conditions are met based on the difference between the actual processing parameters and the theoretical processing parameters of the current processing position; The importance acquisition module is configured to: if the parameter adjustment pre-judgment condition is met, determine the importance of the parameter adjustment based on the difference between the theoretical and actual processing parameters at the current processing position, and in combination with the difference between the actual and theoretical historical temperature data of the heat-affected zone at the current processing position; determine a correction value of the importance of the parameter adjustment based on the importance of the parameter adjustment and in combination with changes in the processing path near the current processing position; The relevant parameter adjustment module is used to adjust the laser processing related parameters according to the difference between the actual ambient temperature data and the theoretical ambient temperature data of the current processing position and in combination with the importance correction value of the parameter adjustment.

2. The online monitoring and adjustment system for laser processing according to claim 1, characterized in that: The parameter adjustment prediction module is used to: Obtaining a theoretical processing parameter vector composed of different types of theoretical processing parameters of the current processing position, and an actual processing parameter vector composed of different types of actual processing parameters of the current processing position; determining the necessity of parameter adjustment according to the difference between the theoretical processing parameter vector and the actual processing parameter vector; The parameter adjustment necessity is compared with a set necessity threshold. If the parameter adjustment necessity is greater than the set necessity threshold, it is determined that the parameter adjustment prejudgment condition is met; otherwise, it is determined that the parameter adjustment prejudgment condition is not met.

3. The online monitoring and adjustment system for laser processing according to claim 2, characterized in that: The importance acquisition module is used to: Dividing all temperature values ​​in the actual historical temperature data of the current processing position according to each set temperature range to obtain first temperature groups affected by the heat-affected zone, and dividing all temperature values ​​in the theoretical historical temperature data of the current processing position to obtain second temperature groups affected by the heat-affected zone, each first temperature group corresponding to one second temperature group; The first temperature group with the largest temperature value among the first temperature groups is selected as the target first temperature group. The importance of parameter adjustment is determined based on the necessity of parameter adjustment, combined with the difference in heat-affected zone impact time between each first temperature group and its corresponding second temperature group, and the difference between the temperature value in the target first temperature group and the theoretical laser processing temperature.

4. The online monitoring and adjustment system for laser processing according to claim 3, characterized in that: The importance acquisition module is used to: Determine a reference weight corresponding to each first temperature group according to the temperature values ​​in each first temperature group, wherein a larger temperature value in the first temperature group corresponds to a larger reference weight; performing weighted addition of the heat-affected zone impact time differences between each of the first temperature groups and its corresponding second temperature group according to the reference weight to obtain a possibility of machining abnormality; Determine the absolute value of the difference between the average temperature of the target first temperature group and the theoretical laser processing temperature, determine the necessity of parameter adjustment and the product of the absolute value of the difference, and obtain the difference between actual processing and theoretical processing; The product of the machining abnormality possibility and the difference between the actual machining and the theoretical machining is normalized to obtain the importance of parameter adjustment.

5. An online monitoring and adjustment system for laser processing according to claim 3 or 4, characterized in that: The importance acquisition module is used to: Each of the first temperature groups and each of the second temperature groups is regarded as a temperature group to be analyzed, a time interval between a maximum temperature value and a minimum temperature value in the temperature group to be analyzed is determined, and the time interval is regarded as a heat affected zone impact time of the temperature group to be analyzed.

6. The online monitoring and adjustment system for laser processing according to claim 1, characterized in that: The importance acquisition module is used to: Determining a neighboring area of ​​a current processing position, and determining a path length of a local path segment of a processing path after the current processing position that is located in the neighboring area; The importance of the parameter adjustment is corrected according to the path length and whether the processing path after the current processing position undergoes a path change in the adjacent area to obtain a parameter adjustment importance correction value.

7. The online monitoring and adjustment system for laser processing according to claim 6, characterized in that: The importance acquisition module is used to: If the machining path after the current machining position does not undergo a path change in the adjacent area, the significance level of the heat-affected zone superposition effect is set to a fixed value; if the machining path after the current machining position undergoes a path change in the adjacent area, the significance level of the heat-affected zone superposition effect greater than the fixed value is determined based on the angle of change in the extension direction of the machining path before and after the path change; The product value of the path length, the significance of the superposition effect of the heat-affected zone, and the importance of the parameter adjustment is determined, and the product value is normalized to obtain a correction value of the importance of the parameter adjustment.

8. The online monitoring and adjustment system for laser processing according to claim 7, characterized in that: The importance acquisition module is used to: The fixed value is 1, and the extension direction change angle of the processing path after the current processing position before and after the path changes for the first time in the adjacent area is used as the exponent of the exponential function to map the extension direction change angle, and the function value of the exponential function is used as the significance degree of the superposition effect of the heat affected zone greater than the fixed value.

9. The online monitoring and adjustment system for laser processing according to claim 3, characterized in that: The relevant parameter adjustment module is used to: Dividing all temperature values ​​in the actual ambient temperature data of the current processing position according to each set temperature range to obtain each third temperature group affected by the heat-affected zone, and dividing all temperature values ​​in the theoretical ambient temperature data of the current processing position to obtain each fourth temperature group affected by the heat-affected zone; Select the third temperature group with the largest temperature value among all third temperature groups as the target third temperature group, and select the fourth temperature group with the largest temperature value among all fourth temperature groups as the target fourth temperature group; determining an error in the proportion of the affected surrounding area according to a difference in area between an actual affected surrounding area of ​​the current processing position corresponding to the target third temperature group and a theoretical affected surrounding area of ​​the current processing position corresponding to the target fourth temperature group; Determining a parameter adjustment characteristic value according to the error in the proportion of the affected surrounding area and the correction value of the importance of the parameter adjustment; Laser processing related parameters are adjusted based on the error in the proportion of the affected surrounding area and the parameter adjustment characteristic value, and combined with the area difference between the actual affected surrounding area of ​​the current processing position corresponding to the target third temperature group and the theoretical affected surrounding area of ​​the current processing position corresponding to the target fourth temperature group.

10. The online monitoring and adjustment system for laser processing according to claim 9, characterized in that: The relevant parameter adjustment module is used to: If the error in the proportion of the affected surrounding area is greater than the set proportion error threshold, and the difference between the area of ​​the actual affected surrounding area of ​​the current processing position corresponding to the target third temperature group and the area of ​​the theoretical affected surrounding area of ​​the current processing position corresponding to the target fourth temperature group is greater than the first set difference threshold, and the first set difference threshold is greater than 0, then according to the parameter adjustment characteristic value, the laser aperture and the laser movement speed are controlled to be reduced, and the emission of the cooling gas is increased. The larger the parameter adjustment characteristic value, the greater the adjustment of the laser aperture, the laser movement speed, and the emission of the cooling gas; If the error in the proportion of the affected surrounding area is greater than the set proportion error threshold, and the difference between the area of ​​the actual affected surrounding area of ​​the current processing position corresponding to the target third temperature group and the area of ​​the theoretical affected surrounding area of ​​the current processing position corresponding to the target fourth temperature group is less than the second set difference threshold, and the second set difference threshold is less than 0, then the parameter adjustment characteristic value is adjusted according to the control to increase the laser aperture and the laser movement speed. The larger the parameter adjustment characteristic value, the greater the adjustment amount of the laser aperture and the laser movement speed.

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