Laser cutting monitoring method and system based on operation box

Abstract

The present invention belongs to the field of laser cutting technology. The present invention provides a laser cutting monitoring method and system based on an operation box, including: comparing the cutting temperature of a cutting machine received in real time with the cutting set temperature of the cutting machine through a processor to obtain an analysis signal, judging the type of change in the cutting temperature of the laser cutting machine, and obtaining the operation out-of-range time of the cutting temperature. If the operation out-of-range time is greater than or equal to the cutting processing time, the cutting is continued until completion. If the operation out-of-range time is less than the cutting processing time, the cutting is stopped before the end of the operation out-of-range time. The present invention ensures that the change in cutting temperature will not cause cutting damage, realizes comprehensive monitoring of each cutting temperature during the laser cutting process, and ensures the quality of laser cutting.

Description

Technical Field

[0001] The invention belongs to the technical field of laser cutting, and in particular relates to a laser cutting monitoring method and system based on an operation box. Background Art

[0002] Laser cutting technology is widely used in the manufacturing industry due to its high precision, high efficiency and flexibility. However, traditional laser cutting monitoring systems often have problems such as incomplete data collection, untimely processing, and complex operation, making it difficult to achieve comprehensive and real-time monitoring of laser cutting machines. Therefore, it is particularly important to develop a new and efficient laser cutting monitoring method.

[0003] In the production and processing of the operating box, the existing technology has the following problems when monitoring laser cutting: when the operating parameters of the laser cutting machine are abnormal, it will cause cutting abnormality, and its monitoring is not timely and it is impossible to intervene in advance, resulting in a high probability of cutting damage. There is a lack of analysis of its operating change trend, and it is impossible to obtain the out-of-range time of the operating parameter change, so that the laser cutting cannot be accurately controlled according to the operating out-of-range time corresponding to the operating parameters.

[0004] To this end, the present invention provides a laser cutting monitoring method and system based on an operation box. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a laser cutting monitoring method based on an operation box, comprising:

[0007] A sensor for collecting operating parameters is installed on the laser cutting machine, and the real-time operating parameters of the laser cutting machine are collected by the sensor and sent to the processor;

[0008] Among them, the operating parameters include cutting temperature;

[0009] The processor compares the cutting temperature of the cutting machine received in real time with the cutting setting temperature of the cutting machine to obtain an analysis signal;

[0010] Based on the analysis signal, the deviation performance data of the cutting temperature of the laser cutting machine is obtained, wherein the deviation performance data includes a deviation change performance value, and the change type of the cutting temperature of the laser cutting machine is judged based on the deviation change performance value, wherein the change type includes a sudden change and a non-sudden change, if the change type is a sudden change, a cutting stop signal is generated, and if the change type is a non-sudden change, the operation out-of-range time of the cutting temperature is obtained;

[0011] Compare the operation out-of-range time with the remaining time for cutting processing. If the operation out-of-range time is greater than or equal to the cutting processing time, continue cutting until completion. If the operation out-of-range time is less than the cutting processing time, it is necessary to stop cutting before the target out-of-range time ends.

[0012] As a further technical solution of the present invention, the analysis signal is generated in the following manner:

[0013] Compare the cutting temperature of the laser cutting machine collected in real time with the cutting set temperature;

[0014] If the cutting temperature is not equal to the cutting set temperature, it means that the cutting temperature of the laser cutting machine deviates from the cutting set temperature, and a deviation signal is generated;

[0015] Based on the deviation signal, the cutting temperature of the laser cutting machine acquired in real time is compared with the cutting temperature deviation range;

[0016] If the cutting temperature is within the cutting temperature deviation range, it means that although the cutting temperature deviates from the cutting set temperature, it does not exceed the allowable deviation range of the cutting temperature, and a deviation normal signal is generated;

[0017] Based on the deviation from the normal signal, the cutting temperature of the laser cutting machine collected in real time is processed with the adjacent and nearest cutting temperature deviation range endpoint value, and the difference is processed by taking the absolute value to obtain the cutting temperature proximity value, and the cutting temperature proximity value is compared with the cutting temperature proximity threshold value;

[0018] If the cutting temperature proximity value is less than or equal to the cutting temperature proximity threshold, it means that the current cutting temperature of the laser cutting machine deviates from the cutting set temperature and is close to the end point value of the cutting temperature deviation range. Control analysis is required to prevent the cutting temperature of the laser cutting machine from exceeding the cutting temperature deviation range, thereby causing cutting damage to the operating box, and then an analysis signal is generated.

[0019] As a further technical solution of the present invention, the method for obtaining the deviation change performance value is:

[0020] The operation deviation time characterization value Sk and the operation deviation degree characterization value Sd are processed by the formula: The deviation change performance value BH is obtained, wherein a1 and a2 are both preset proportional coefficients.

[0021] As a further technical solution of the present invention, the operation deviation time characterization value Sk is obtained in the following manner:

[0022] The time point when the cutting temperature deviates from the cutting set temperature and the time point when the analysis signal appears are obtained, and the period between the time point when the cutting temperature deviates from the cutting set temperature and the time point when the analysis signal appears is marked as the operation deviation period. The duration of the operation deviation period is obtained, and it is ratio-processed with the cutting standard duration to obtain the operation deviation time characterization value, and it is marked as Sk.

[0023] As a further technical solution of the present invention, the operation deviation degree characterization value Sd is obtained in the following manner:

[0024] Obtain all cutting temperatures within the running deviation period and mark them in an XY coordinate system, where the X-axis represents time and the Y-axis represents cutting temperature, and connect the cutting temperature data points marked after to obtain a cutting temperature change curve;

[0025] According to the cutting temperature variation curve, determining the slope value at the start time point of the operation deviation period and the slope value at the end time point of the operation deviation period;

[0026] The slope change value is obtained by calculating the difference between the slope value at the end time point of the operation deviation period and the slope value at the start time point of the operation deviation period. The slope change value is compared with the slope value at the start time point of the operation deviation period to obtain the operation deviation degree characterization value, which is marked as Sd.

[0027] As a further technical solution of the present invention, the deviation change performance value is compared with the deviation change performance threshold;

[0028] If the deviation change performance value is greater than or equal to the deviation change performance threshold, it means that the change type of the cutting temperature in the operation deviation period presents a sudden change;

[0029] If the deviation change performance value is less than the deviation change performance threshold, it means that the change type of the cutting temperature in the operation deviation period presents a non-mutational change.

[0030] As a further technical solution of the present invention, the method for obtaining the operation out-of-range time is:

[0031] Based on the processing and analysis of the operation deviation period, the deviation from the same direction sub-period and the deviation from the same direction value PLx are obtained;

[0032] Processing and analyzing based on the deviation from the same direction sub-period, obtaining the deviation from synchronization sub-period and the deviation from synchronization value PLd;

[0033] Based on the processing and analysis of the deviated synchronization sub-period, a deviation from linearity value PLc is obtained;

[0034] The deviation from the same direction value PLx, the deviation from the synchronization value PLd and the deviation from the linear deviation value PLc are processed by the formula: Obtain a linear change performance value Xx, where s1, s2 and s3 are all preset proportional coefficients;

[0035] comparing the linear change performance value Xx with the linear change performance threshold;

[0036] If the linear change performance value Xx is greater than or equal to the linear change performance threshold, it means that the cutting temperature in the operation deviation period presents a linear change under the non-sudden change type, and a linear signal is generated;

[0037] If the linear change performance value Xx is less than the linear change performance threshold, it means that the cutting temperature in the operation deviation period presents a nonlinear change under the non-sudden change type, and a nonlinear signal is generated;

[0038] Based on the linear signal, in the coordinate system where the cutting temperature change curve is located, the cutting temperature deviation range endpoint value closest to the cutting temperature is taken as the reference value, marked on the Y axis, and a straight line parallel to the X axis is drawn through the marked point, and it is marked as the critical line. Several cutting temperature data points are collected on the cutting temperature change curve, and fitted by the least squares method to obtain a fitting straight line. The fitting straight line is extended to intersect with the critical line, and the time point corresponding to the intersection is obtained, and it is marked as the cutting temperature change critical time point. According to the cutting temperature change critical time point and the time point when the analysis signal appears, the operation out-of-range time is obtained by difference calculation;

[0039] Based on the nonlinear signal, the maximum cutting temperature change value in all sub-periods that deviate from the same direction is selected, and the ratio is processed with the time length corresponding to the sub-period that deviates from the same direction to obtain the historical maximum change rate of the cutting temperature; the cutting temperature adjacent value is ratio processed with the historical maximum change rate of the cutting temperature to obtain the operation out-of-range time.

[0040] As a further technical solution of the present invention, the method for obtaining the deviation from the same direction value PLx is:

[0041] The operation deviation period is divided into several sub-periods, the cutting temperature at the initial time point of the sub-period and the cutting temperature at the end time point are obtained, and the difference is calculated to obtain the cutting temperature change value within the sub-period, the cutting temperature change value within the sub-period is compared with 0, and the cutting temperature change deviation trend type within the sub-period is judged according to the comparison result. At the same time, the cutting temperature when the analysis signal appears is obtained, and it is compared with the cutting set temperature, and the cutting temperature change deviation trend type within the operation deviation period is judged according to the comparison result. If the cutting temperature change deviation trend type within the sub-period is the same as the cutting temperature change deviation trend type within the operation deviation period, then the sub-period is marked as a deviation from the same direction sub-period, the number of deviation from the same direction sub-periods is counted, and the ratio is processed with the number of sub-periods to obtain the deviation from the same direction value, and it is marked as PLx.

[0042] As a further technical solution of the present invention, the synchronization deviation value PLd is obtained in the following manner:

[0043] Obtain all cutting temperature change values ​​in the sub-periods that deviate from the same direction, sum and average them to obtain the cutting temperature change mean, perform difference processing on the cutting temperature change value in the sub-period that deviates from the same direction and the cutting temperature change mean, and take the absolute value of the difference to obtain the cutting temperature change deviation value in the sub-period that deviates from the same direction, sum and average all cutting temperature change deviation values ​​in the sub-periods that deviate from the same direction to obtain the cutting temperature change deviation mean, and compare the cutting temperature change deviation value in the sub-period that deviates from the same direction with the cutting temperature change deviation mean;

[0044] If the cutting temperature variation deviation value within the deviation from the same direction sub-period is less than or equal to the cutting temperature variation deviation mean value, the deviation from the same direction sub-period is marked as a deviation from the synchronous sub-period;

[0045] The number of deviated synchronization sub-periods is obtained, and the deviated synchronization value is obtained by comparing the deviated synchronization sub-period with the number of deviated co-directional sub-periods, and the deviated synchronization value is marked as PLd.

[0046] The method for obtaining the deviation from linearity value PLc is as follows:

[0047] Obtain all cutting temperature change values ​​that deviate from the synchronization sub-period, sum and average them to obtain the mean cutting temperature change value of the sub-period that deviates from the synchronization, obtain the cutting temperature change value within the operation deviation period, and ratio it with the number of sub-periods to obtain a cutting temperature change reference value, perform difference processing on the mean cutting temperature change value of the sub-period that deviates from the synchronization and the cutting temperature change reference value, take the absolute value of the difference, and ratio the result with the cutting temperature change reference value to obtain a deviation from linearity, and mark it as PLc, wherein the cutting temperature change reference value is obtained by dividing the cutting temperature change value within the operation deviation period by the number of sub-periods.

[0048] A laser cutting monitoring system based on an operation box, comprising:

[0049] Data acquisition module: A sensor for collecting operating parameters is installed on the laser cutting machine. The sensor is used to collect the real-time operating parameters of the laser cutting machine and send them to the processor;

[0050] Among them, the operating parameters include cutting temperature;

[0051] Comparison and analysis module: the processor compares the cutting temperature of the cutting machine received in real time with the cutting setting temperature of the cutting machine to obtain an analysis signal;

[0052] Time acquisition module: based on the analysis signal, the deviation performance data of the cutting temperature of the laser cutting machine is obtained, wherein the deviation performance data includes the deviation change performance value, and the change type of the cutting temperature of the laser cutting machine is judged based on the deviation change performance value, wherein the change type includes a sudden change and a non-sudden change. If the change type is a sudden change, a cutting stop signal is generated, and if the change type is a non-sudden change, the operation out-of-range time of the cutting temperature is obtained;

[0053] Control analysis module: compare the operation out-of-range time with the remaining cutting processing time. If the operation out-of-range time is greater than or equal to the cutting processing time, continue cutting until completion. If the operation out-of-range time is less than the cutting processing time, it is necessary to stop cutting before the target out-of-range time ends.

[0054] The beneficial effects of the present invention are as follows:

[0055] The processor compares the cutting temperature of the cutting machine received in real time with the cutting set temperature of the cutting machine to obtain an analysis signal, and based on the analysis signal, obtains the deviation performance data of the cutting temperature of the laser cutting machine, wherein the deviation performance data includes a deviation change performance value, and the change type of the cutting temperature of the laser cutting machine is judged based on the deviation change performance value, wherein the change type includes a sudden change and a non-sudden change, and if the change type is a sudden change, a cutting stop signal is generated, and if the change type is a non-sudden change, the operation out-of-range time of the cutting temperature is obtained, and if the operation out-of-range time is greater than or equal to the remaining time of the cutting process, the cutting is continued until it is completed, and if the operation out-of-range time is less than the remaining time of the cutting process, it is necessary to stop cutting before the end of the target out-of-range time, thereby improving the comprehensiveness of laser cutting monitoring and greatly reducing the probability of damage to laser cutting, and better ensuring the laser cutting quality of the operating box. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The present invention will be further described below in conjunction with the accompanying drawings.

[0057] Figure 1 is a flowchart of the steps of a laser cutting monitoring method based on an operation box according to Embodiment 1 of the present invention;

[0058] Figure 2 It is a flowchart of a laser cutting monitoring system based on an operation box described in Example 2 of the present invention. DETAILED DESCRIPTION

[0059] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0060] Example 1

[0061] A laser cutting monitoring method based on an operation box according to an embodiment of the present invention includes:

[0062] Step 1: Install a sensor for collecting operating parameters on the laser cutting machine, use the sensor to collect the real-time operating parameters of the laser cutting machine, and send them to the processor;

[0063] Among them, the operating parameters include but are not limited to cutting temperature;

[0064] Step 2: The processor compares the cutting temperature of the cutting machine received in real time with the cutting setting temperature of the cutting machine to obtain an analysis signal;

[0065] It should be noted that the cutting setting temperature is set in advance by the technicians according to the laser cutting requirements;

[0066] In some embodiments, the cutting temperature of the laser cutting machine acquired in real time is compared with the cutting set temperature;

[0067] If the cutting temperature is equal to the cutting set temperature, it means that the cutting temperature of the laser cutting machine is normal;

[0068] If the cutting temperature is not equal to the cutting set temperature, it means that the cutting temperature of the laser cutting machine deviates from the cutting set temperature, and a deviation signal is generated;

[0069] Based on the deviation signal, the cutting temperature of the laser cutting machine acquired in real time is compared with the cutting temperature deviation range;

[0070] If the cutting temperature is within the cutting temperature deviation range, it means that although the cutting temperature deviates from the cutting set temperature, it does not exceed the allowable deviation range of the cutting temperature, and a deviation normal signal is generated;

[0071] If the cutting temperature is not within the cutting temperature deviation range, it means that the cutting temperature not only deviates from the cutting set temperature, but also exceeds the allowable deviation range of the cutting temperature, and a cutting stop signal is generated. Based on the cutting stop signal, the laser cutting machine is controlled to stop cutting to prevent continued cutting from seriously affecting the production cutting quality of the operating box and causing cutting damage to the operating box;

[0072] It should also be noted that the cutting temperature deviation range indicates the parameter range within which the cutting temperature of the laser cutting machine is allowed to deviate and fluctuate during the laser cutting process;

[0073] Based on the deviation from the normal signal, the cutting temperature of the laser cutting machine collected in real time is processed with the adjacent and nearest cutting temperature deviation range endpoint value, and the difference is processed by taking the absolute value to obtain the cutting temperature proximity value, and the cutting temperature proximity value is compared with the cutting temperature proximity threshold value;

[0074] If the cutting temperature proximity value is less than or equal to the cutting temperature proximity threshold, it means that the current cutting temperature of the laser cutting machine deviates from the cutting set temperature and is close to the end value of the cutting temperature deviation range. Control analysis is required to prevent the cutting temperature of the laser cutting machine from exceeding the cutting temperature deviation range, thereby causing cutting damage to the operating box, and an analysis signal is generated;

[0075] If the cutting temperature proximity value is greater than the cutting temperature proximity threshold, it means that the current cutting temperature of the laser cutting machine deviates from the cutting set temperature but is not close to the cutting temperature deviation range endpoint value, and no control analysis is required, and no operation is performed;

[0076] Step 3: Based on the analysis signal, the deviation performance data of the cutting temperature of the laser cutting machine is obtained, wherein the deviation performance data includes a deviation change performance value, and the change type of the cutting temperature of the laser cutting machine is judged based on the deviation change performance value, wherein the change type includes a sudden change and a non-sudden change. If the change type is a sudden change, a cutting stop signal is generated, and if the change type is a non-sudden change, the operation out-of-range time of the cutting temperature is obtained;

[0077] In some embodiments, the time point when the cutting temperature deviates from the cutting set temperature and the time point when the analysis signal appears are obtained, and the period between the time point when the cutting temperature deviates from the cutting set temperature and the time point when the analysis signal appears is marked as the operation deviation period, and the duration of the operation deviation period is obtained, and the ratio is processed with the cutting standard duration to obtain the operation deviation time characterization value, and it is marked as Sk;

[0078] Among them, the standard cutting time indicates the average time it takes for a laser cutting machine to complete the same type of cutting at the cutting set temperature in the past;

[0079] Obtain all cutting temperatures within the running deviation period and mark them in an XY coordinate system, where the X-axis represents time and the Y-axis represents cutting temperature, and connect the cutting temperature data points marked after to obtain a cutting temperature change curve;

[0080] According to the cutting temperature variation curve, determining the slope value at the start time point of the operation deviation period and the slope value at the end time point of the operation deviation period;

[0081] The slope value at the end time point of the operation deviation period and the slope value at the start time point of the operation deviation period are calculated to obtain a slope change value, and the slope change value is processed by ratio with the slope value at the start time point of the operation deviation period to obtain an operation deviation degree characterization value, which is marked as Sd;

[0082] The obtained operation deviation time characterization value Sk and operation deviation degree characterization value Sd are processed by data, and the formula is: Obtain the deviation change performance value BH, where a1 and a2 are both preset proportional coefficients;

[0083] It should be noted that the meaning of the deviation change performance value is: the deviation change performance value is obtained by combining the operation deviation time representation value Sk and the operation deviation degree representation value Sd, which reflects the change duration and degree of the cutting temperature. The larger the deviation change performance value, the higher the degree of mutation change of the cutting temperature.

[0084] In some embodiments, the deviation change performance value is compared to a deviation change performance threshold;

[0085] If the deviation change performance value is greater than or equal to the deviation change performance threshold, it means that the change type of the cutting temperature in the operation deviation period presents a sudden change;

[0086] If the deviation change performance value is less than the deviation change performance threshold, it means that the change type of the cutting temperature in the operation deviation period presents a non-mutational change;

[0087] Based on the non-mutational change of the cutting temperature, the operation deviation period is divided into several sub-periods, the cutting temperature at the initial time point of the sub-period and the cutting temperature at the end time point are obtained, and the difference is calculated to obtain the cutting temperature change value in the sub-period, and the cutting temperature change value in the sub-period is compared with 0. According to the comparison result, the deviation trend type of the cutting temperature change in the sub-period is judged, wherein the deviation trend types of the cutting temperature change in the sub-period include growth deviation, decline deviation and invariance deviation. The specific judgment process is as follows:

[0088] If the cutting temperature change value in the sub-period is greater than 0, it means that the cutting temperature change trend type in the sub-period is an increasing deviation;

[0089] If the cutting temperature change value in the sub-period is less than 0, it means that the cutting temperature change trend type in the sub-period is a downward deviation;

[0090] If the cutting temperature change value in the sub-period is equal to 0, it means that the cutting temperature change trend type in the sub-period is invariance deviation;

[0091] After determining the deviation trend type of the cutting temperature change in the sub-period, obtain the cutting temperature when the analysis signal appears, and compare it with the cutting set temperature. According to the comparison result, determine the deviation trend type of the cutting temperature change in the operation deviation period. The deviation trend type of the cutting temperature change in the operation deviation period includes an increasing deviation and a decreasing deviation. The specific determination process is as follows:

[0092] If the cutting temperature when the analysis signal appears is greater than the cutting set temperature, it means that the overall change of the cutting temperature during the operation deviation period shows an increasing deviation;

[0093] If the cutting temperature when the analysis signal appears is lower than the cutting set temperature, it means that the overall change of the cutting temperature during the operation deviation period shows a downward deviation;

[0094] After the deviation trend type of the cutting temperature change in the sub-period and the deviation trend type of the cutting temperature change in the running deviation period are determined, the deviation trend types are compared:

[0095] If the deviation trend type of the cutting temperature change in the sub-period is the same as the deviation trend type of the cutting temperature change in the running deviation period, then the sub-period is marked as a deviation-in-the-same-direction sub-period;

[0096] If the deviation trend type of the cutting temperature change in the sub-period is different from the deviation trend type of the cutting temperature change in the running deviation period, then the sub-period is marked as a non-deviation same-direction sub-period;

[0097] It should be noted that the deviation from the same direction sub-period means that within the deviation from the same direction sub-period, the direction of the deviation change of the cutting temperature is consistent with the direction of the overall deviation change of the cutting temperature;

[0098] The number of sub-periods that deviate from the same direction is counted, and the ratio is processed with the number of sub-periods to obtain the deviation from the same direction value, which is marked as PLx;

[0099] Obtain all cutting temperature change values ​​in the sub-periods that deviate from the same direction, sum and average them to obtain the cutting temperature change mean, perform difference processing on the cutting temperature change value in the sub-period that deviates from the same direction and the cutting temperature change mean, and take the absolute value of the difference to obtain the cutting temperature change deviation value in the sub-period that deviates from the same direction, sum and average all cutting temperature change deviation values ​​in the sub-periods that deviate from the same direction to obtain the cutting temperature change deviation mean, and compare the cutting temperature change deviation value in the sub-period that deviates from the same direction with the cutting temperature change deviation mean;

[0100] If the cutting temperature variation deviation value within the deviation from the same direction sub-period is greater than the cutting temperature variation deviation mean value, the deviation from the same direction sub-period is marked as a deviation from the asynchronous sub-period;

[0101] If the cutting temperature variation deviation value within the deviation from the same direction sub-period is less than or equal to the cutting temperature variation deviation mean value, the deviation from the same direction sub-period is marked as a deviation from the synchronous sub-period;

[0102] The number of deviated synchronization sub-periods is obtained, and the deviated synchronization value is obtained by comparing the deviated synchronization sub-period with the number of deviated co-directional sub-periods, and the deviated synchronization value is marked as PLd.

[0103] Obtain all cutting temperature change values ​​of the sub-periods that deviate from the synchronization, and sum and average them to obtain the mean cutting temperature change value of the sub-periods that deviate from the synchronization, obtain the cutting temperature change value in the running deviation period, and perform ratio processing on it with the number of sub-periods to obtain the cutting temperature change reference value, perform difference processing on the cutting temperature change mean value of the sub-period that deviates from the synchronization and the cutting temperature change reference value, and take the absolute value of the difference, and perform ratio processing on the result with the cutting temperature change reference value to obtain the deviation from linearity value, and mark it as PLc, wherein the cutting temperature change reference value is obtained by dividing the cutting temperature change value in the running deviation period by the number of sub-periods;

[0104] It should be noted that the deviation from linearity deviation value PLc means that the smaller the deviation between the mean value of cutting temperature change in the deviating synchronous sub-period and the reference value of cutting temperature change, the closer the cutting temperature change in the deviating synchronous sub-period is to linear change. The reason is that the reference value of cutting temperature change is obtained by dividing the cutting temperature change value in the running deviation period by the number of sub-periods to obtain the mean value of cutting temperature change that should change in the sub-period under the condition of linear growth. If it is equal to the mean value of cutting temperature change in the deviating synchronous sub-period, it means that the cutting temperature change in the deviating synchronous sub-period is closer to linear change.

[0105] The obtained deviation from the same direction value PLx, deviation from synchronization value PLd and deviation from linear deviation value PLc are processed by the formula: Obtain a linear change performance value Xx, where s1, s2 and s3 are all preset proportional coefficients;

[0106] In some embodiments, the linear change performance value Xx is compared with a linear change performance threshold;

[0107] If the linear change performance value Xx is greater than or equal to the linear change performance threshold, it means that the cutting temperature in the operation deviation period presents a linear change under the non-sudden change type, and a linear signal is generated;

[0108] If the linear change performance value Xx is less than the linear change performance threshold, it means that the cutting temperature in the operation deviation period presents a nonlinear change under the non-sudden change type, and a nonlinear signal is generated;

[0109] Based on the linear signal, in the coordinate system where the cutting temperature change curve is located, the cutting temperature deviation range endpoint value closest to the cutting temperature is taken as the reference value, marked on the Y axis, and a straight line parallel to the X axis is drawn through the marked point, and it is marked as the critical line. Several cutting temperature data points are collected on the cutting temperature change curve, and fitted by the least squares method to obtain a fitting straight line. The fitting straight line is extended to intersect with the critical line, and the time point corresponding to the intersection is obtained, and it is marked as the cutting temperature change critical time point. According to the cutting temperature change critical time point and the time point when the analysis signal appears, the operation out-of-range time is obtained by difference calculation;

[0110] Based on the nonlinear signal, the maximum cutting temperature change value in all the sub-periods that deviate from the same direction is selected, and the ratio is processed with the time length corresponding to the sub-period that deviates from the same direction to obtain the historical maximum change rate of the cutting temperature; the cutting temperature adjacent value is processed with the historical maximum change rate of the cutting temperature to obtain the operation out-of-range time;

[0111] Step 4: Compare the operation out-of-range time with the remaining time for cutting processing. If the operation out-of-range time is greater than or equal to the cutting processing time, continue cutting until it is completed. If the operation out-of-range time is less than the cutting processing time, it is necessary to stop cutting before the target out-of-range time ends.

[0112] Specifically, the laser cutting duration is obtained according to the current time point and the time point when the laser cutting starts, and the laser cutting duration is subjected to difference processing with the cutting standard duration to obtain the remaining time of the laser cutting;

[0113] In some embodiments, the run out of range time is compared to the laser cutting remaining time;

[0114] If the operation out-of-range time is greater than or equal to the remaining laser cutting time, it means that the cutting temperature will not exceed the cutting temperature deviation range before the laser cutting is completed, and laser cutting can continue;

[0115] If the operation out-of-range time is less than the remaining time of laser cutting, it means that the cutting temperature will exceed the cutting temperature deviation range before the laser cutting is completed. To ensure the cutting quality, it is necessary to stop cutting before the operation out-of-range time ends. The processor sends the target out-of-range time to the display system and displays a countdown warning.

[0116] The technical solution of the embodiment of the present invention is: the cutting temperature of the cutting machine received in real time is compared with the cutting set temperature of the cutting machine by a processor to obtain an analysis signal, and based on the analysis signal, the deviation performance data of the cutting temperature of the laser cutting machine is obtained, wherein the deviation performance data includes a deviation change performance value, and the change type of the cutting temperature of the laser cutting machine is judged based on the deviation change performance value, wherein the change type includes a sudden change and a non-sudden change. If the change type is a sudden change, a cutting stop signal is generated, and if the change type is a non-sudden change, the operation out-of-range time of the cutting temperature is obtained, and if the operation out-of-range time is greater than or equal to the remaining time of the cutting process, the cutting is continued until completion, and if the operation out-of-range time is less than the remaining time of the cutting process, it is necessary to stop cutting before the end of the target out-of-range time, thereby improving the comprehensiveness of laser cutting monitoring and greatly reducing the probability of damage to laser cutting, and better ensuring the laser cutting quality of the operating box.

[0117] Example 2

[0118] like Figure 2 As shown, a laser cutting monitoring system based on an operation box according to an embodiment of the present invention includes:

[0119] Data acquisition module: A sensor for collecting operating parameters is installed on the laser cutting machine. The sensor is used to collect the real-time operating parameters of the laser cutting machine and send them to the processor;

[0120] Among them, the operating parameters include cutting temperature;

[0121] Comparison and analysis module: the processor compares the cutting temperature of the cutting machine received in real time with the cutting setting temperature of the cutting machine to obtain an analysis signal;

[0122] Time acquisition module: based on the analysis signal, the deviation performance data of the cutting temperature of the laser cutting machine is obtained, wherein the deviation performance data includes the deviation change performance value, and the change type of the cutting temperature of the laser cutting machine is judged based on the deviation change performance value, wherein the change type includes a sudden change and a non-sudden change. If the change type is a sudden change, a cutting stop signal is generated, and if the change type is a non-sudden change, the operation out-of-range time of the cutting temperature is obtained;

[0123] Control analysis module: compare the operation out-of-range time with the remaining cutting processing time. If the operation out-of-range time is greater than or equal to the cutting processing time, continue cutting until completion. If the operation out-of-range time is less than the cutting processing time, it is necessary to stop cutting before the target out-of-range time ends.

[0124] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A laser cutting monitoring method based on an operation box, characterized in that: include: A sensor for collecting operating parameters is installed on the laser cutting machine, and the real-time operating parameters of the laser cutting machine are collected by the sensor and sent to the processor; Among them, the operating parameters include cutting temperature; The processor compares the cutting temperature of the cutting machine received in real time with the cutting setting temperature of the cutting machine to obtain an analysis signal; The analysis signal is generated in the following manner: Compare the cutting temperature of the laser cutting machine collected in real time with the cutting set temperature; If the cutting temperature is not equal to the cutting set temperature, it means that the cutting temperature of the laser cutting machine deviates from the cutting set temperature, and a deviation signal is generated; Based on the deviation signal, the cutting temperature of the laser cutting machine acquired in real time is compared with the cutting temperature deviation range; If the cutting temperature is within the cutting temperature deviation range, it means that although the cutting temperature deviates from the cutting set temperature, it does not exceed the allowable deviation range of the cutting temperature, and a deviation normal signal is generated; Based on the deviation from the normal signal, the cutting temperature of the laser cutting machine collected in real time is processed with the adjacent and nearest cutting temperature deviation range endpoint value, and the difference is processed by taking the absolute value to obtain the cutting temperature proximity value, and the cutting temperature proximity value is compared with the cutting temperature proximity threshold value; If the cutting temperature proximity value is less than or equal to the cutting temperature proximity threshold, it means that the current cutting temperature of the laser cutting machine deviates from the cutting set temperature and is close to the end value of the cutting temperature deviation range. Control analysis is required to prevent the cutting temperature of the laser cutting machine from exceeding the cutting temperature deviation range, thereby causing cutting damage to the operating box, and an analysis signal is generated; Based on the analysis signal, the deviation performance data of the cutting temperature of the laser cutting machine is obtained, wherein the deviation performance data includes a deviation change performance value, and the change type of the cutting temperature of the laser cutting machine is judged based on the deviation change performance value, wherein the change type includes a sudden change and a non-sudden change, if the change type is a sudden change, a cutting stop signal is generated, and if the change type is a non-sudden change, the operation out-of-range time of the cutting temperature is obtained; The deviation change performance value is obtained in the following manner: The operation deviation time characterization value Sk and the operation deviation degree characterization value Sd are processed by the formula: Obtain the deviation change performance value BH, where a1 and a2 are both preset proportional coefficients; comparing the deviation change performance value to a deviation change performance threshold; If the deviation change performance value is greater than or equal to the deviation change performance threshold, it means that the change type of the cutting temperature in the operation deviation period presents a sudden change; If the deviation change performance value is less than the deviation change performance threshold, it means that the change type of the cutting temperature in the operation deviation period presents a non-mutational change; Compare the operation out-of-range time with the remaining time for cutting processing. If the operation out-of-range time is greater than or equal to the cutting processing time, continue cutting until completion. If the operation out-of-range time is less than the cutting processing time, it is necessary to stop cutting before the target out-of-range time ends.

2. The laser cutting monitoring method based on the operation box according to claim 1 is characterized in that: The operation deviation time characterization value Sk is obtained in the following manner: The time point when the cutting temperature deviates from the cutting set temperature and the time point when the analysis signal appears are obtained, and the period between the time point when the cutting temperature deviates from the cutting set temperature and the time point when the analysis signal appears is marked as the operation deviation period. The duration of the operation deviation period is obtained, and it is ratio-processed with the cutting standard duration to obtain the operation deviation time characterization value, and it is marked as Sk.

3. The laser cutting monitoring method based on the operation box according to claim 1 is characterized in that: The operation deviation degree characterization value Sd is obtained in the following manner: Obtain all cutting temperatures within the running deviation period and mark them in an XY coordinate system, where the X-axis represents time and the Y-axis represents cutting temperature, and connect the cutting temperature data points marked after to obtain a cutting temperature change curve; According to the cutting temperature variation curve, determining the slope value at the start time point of the operation deviation period and the slope value at the end time point of the operation deviation period; The slope change value is obtained by calculating the difference between the slope value at the end time point of the operation deviation period and the slope value at the start time point of the operation deviation period. The slope change value is compared with the slope value at the start time point of the operation deviation period to obtain the operation deviation degree characterization value, which is marked as Sd.

4. The laser cutting monitoring method based on the operation box according to claim 1 is characterized in that: The method for obtaining the operation out-of-range time is as follows: Based on the processing and analysis of the operation deviation period, the deviation from the same direction sub-period and the deviation from the same direction value PLx are obtained; Processing and analyzing based on the deviation from the same direction sub-period, obtaining the deviation from synchronization sub-period and the deviation from synchronization value PLd; Based on the processing and analysis of the deviated synchronization sub-period, a deviation from linearity value PLc is obtained; The deviation from the same direction value PLx, the deviation from the synchronization value PLd and the deviation from the linear deviation value PLc are processed by the formula: Obtain a linear change performance value Xx, where s1, s2 and s3 are all preset proportional coefficients; comparing the linear change performance value Xx with the linear change performance threshold; If the linear change performance value Xx is greater than or equal to the linear change performance threshold, it means that the cutting temperature in the operation deviation period presents a linear change under the non-sudden change type, and a linear signal is generated; If the linear change performance value Xx is less than the linear change performance threshold, it means that the cutting temperature in the operation deviation period presents a nonlinear change under the non-sudden change type, and a nonlinear signal is generated; Based on the linear signal, in the coordinate system where the cutting temperature change curve is located, the cutting temperature deviation range endpoint value closest to the cutting temperature is taken as the reference value, marked on the Y axis, and a straight line parallel to the X axis is drawn through the marked point, and it is marked as the critical line. Several cutting temperature data points are collected on the cutting temperature change curve, and fitted by the least squares method to obtain a fitting straight line. The fitting straight line is extended to intersect with the critical line, and the time point corresponding to the intersection is obtained, and it is marked as the cutting temperature change critical time point. According to the cutting temperature change critical time point and the time point when the analysis signal appears, the operation out-of-range time is obtained by difference calculation; Based on the nonlinear signal, the maximum cutting temperature change value in all sub-periods that deviate from the same direction is selected, and the ratio is processed with the time length corresponding to the sub-period that deviates from the same direction to obtain the historical maximum change rate of the cutting temperature; the cutting temperature adjacent value is ratio processed with the historical maximum change rate of the cutting temperature to obtain the operation out-of-range time.

5. The laser cutting monitoring method based on the operation box according to claim 4 is characterized in that: The method for obtaining the deviation from the same direction value PLx is as follows: The operation deviation period is divided into several sub-periods, the cutting temperature at the initial time point of the sub-period and the cutting temperature at the end time point are obtained, and the difference is calculated to obtain the cutting temperature change value within the sub-period, the cutting temperature change value within the sub-period is compared with 0, and the cutting temperature change deviation trend type within the sub-period is judged according to the comparison result. At the same time, the cutting temperature when the analysis signal appears is obtained, and it is compared with the cutting set temperature, and the cutting temperature change deviation trend type within the operation deviation period is judged according to the comparison result. If the cutting temperature change deviation trend type within the sub-period is the same as the cutting temperature change deviation trend type within the operation deviation period, then the sub-period is marked as a deviation from the same direction sub-period, the number of deviation from the same direction sub-periods is counted, and the ratio is processed with the number of sub-periods to obtain the deviation from the same direction value, and it is marked as PLx.

6. The laser cutting monitoring method based on the operation box according to claim 4 is characterized in that: The synchronization deviation value PLd is obtained in the following manner: Obtain all cutting temperature change values ​​in the sub-periods that deviate from the same direction, sum and average them to obtain the cutting temperature change mean, perform difference processing on the cutting temperature change value in the sub-period that deviates from the same direction and the cutting temperature change mean, and take the absolute value of the difference to obtain the cutting temperature change deviation value in the sub-period that deviates from the same direction, sum and average all cutting temperature change deviation values ​​in the sub-periods that deviate from the same direction to obtain the cutting temperature change deviation mean, and compare the cutting temperature change deviation value in the sub-period that deviates from the same direction with the cutting temperature change deviation mean; If the cutting temperature variation deviation value within the deviation from the same direction sub-period is less than or equal to the cutting temperature variation deviation mean value, the deviation from the same direction sub-period is marked as a deviation from the synchronous sub-period; The number of deviated synchronization sub-periods is obtained, and the deviated synchronization value is obtained by comparing the deviated synchronization sub-period with the number of deviated co-directional sub-periods, and the deviated synchronization value is marked as PLd. The method for obtaining the deviation from linearity value PLc is as follows: Obtain all cutting temperature change values ​​that deviate from the synchronization sub-period, sum and average them to obtain the mean cutting temperature change value of the sub-period that deviates from the synchronization, obtain the cutting temperature change value within the operation deviation period, and ratio it with the number of sub-periods to obtain a cutting temperature change reference value, perform difference processing on the mean cutting temperature change value of the sub-period that deviates from the synchronization and the cutting temperature change reference value, take the absolute value of the difference, and ratio the result with the cutting temperature change reference value to obtain a deviation from linearity, and mark it as PLc, wherein the cutting temperature change reference value is obtained by dividing the cutting temperature change value within the operation deviation period by the number of sub-periods.

7. A laser cutting monitoring system based on an operation box, the system being used to implement the monitoring method according to any one of claims 1 to 6, characterized in that: include: Data acquisition module: A sensor for collecting operating parameters is installed on the laser cutting machine. The sensor is used to collect the real-time operating parameters of the laser cutting machine and send them to the processor; Among them, the operating parameters include cutting temperature; Comparison and analysis module: the processor compares the cutting temperature of the cutting machine received in real time with the cutting setting temperature of the cutting machine to obtain an analysis signal; Time acquisition module: based on the analysis signal, the deviation performance data of the cutting temperature of the laser cutting machine is obtained, wherein the deviation performance data includes the deviation change performance value, and the change type of the cutting temperature of the laser cutting machine is judged based on the deviation change performance value, wherein the change type includes a sudden change and a non-sudden change. If the change type is a sudden change, a cutting stop signal is generated, and if the change type is a non-sudden change, the operation out-of-range time of the cutting temperature is obtained; Control analysis module: compare the operation out-of-range time with the remaining cutting processing time. If the operation out-of-range time is greater than or equal to the cutting processing time, continue cutting until completion. If the operation out-of-range time is less than the cutting processing time, it is necessary to stop cutting before the target out-of-range time ends.

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