A laser cutting method based on adaptive control

Abstract

The present invention belongs to the technical field of laser cutting, and discloses a laser cutting method based on adaptive control; marking the cutting position of the current laser cutting head on the cutting path as the first position, and acquiring the thickness of the second position on the cutting path at the same time, wherein the second position is located in front of the first position, that is, the second position is an uncut position; collecting cutting condition data of the workpiece to be cut, wherein the cutting condition data includes a melting point, a standard thickness and an ambient temperature; dividing the cutting path into n sub-cutting areas according to the second position thickness acquired in real time, wherein n is an integer greater than 1, and the sub-cutting areas use the same cutting power; calculating the standard thickness of the workpiece to be cut in the sub-cutting area according to the second position thickness in the sub-cutting area, and using the same cutting power to complete the cutting of the workpiece to be cut in the sub-cutting area; compared with the prior art, the cutting operation process is simplified, and the cutting efficiency is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cutting, and more specifically, to a laser cutting method based on adaptive control. Background Art

[0002] Laser cutting is to use a focused high-power density laser beam to irradiate the workpiece, so that the irradiated material quickly melts, vaporizes, ablates or reaches the ignition point, and at the same time, the molten material is blown away by a high-speed airflow coaxial with the beam, so as to achieve the cutting of the workpiece. Prior art, such as the patent with the authorization announcement number CN114682907B discloses a high-power laser cutting optical path system, a laser cutting head and a method of using the same, the high-power laser cutting optical path system includes: a laser beam spot adjustment component and a laser beam temperature drift measurement component; the laser beam spot adjustment component determines the position on the light-emitting optical path according to the thickness of the plate to be cut, so as to adjust the spot size of the laser beam, the divergence angle of the laser beam and / or the focal position of the laser beam; the laser beam temperature drift measurement component is used to measure the focal position and the temperature drift information of the focal position in real time, and the laser beam spot adjustment component re-determines its position on the light-emitting optical path according to the temperature drift information, so that the focal position of the laser beam coincides with the preset focal position, and the preset focal position is the focal position determined according to the thickness of the plate. The high-power laser cutting optical path system can obtain a light spot size, a divergence angle of the laser beam and / or a focal position that matches the thickness of the plate.

[0003] However, the prior art still has the following problems:

[0004] In the actual laser cutting process, not only one size type of workpiece is cut. If the existing technology is used, it is necessary to first measure the thickness of the workpiece on the preset cutting path, and then set the corresponding cutting power to ensure that the workpiece can be completely cut off. During the measurement process, a measuring tool is used to walk along the preset cutting path. After obtaining the thickness data, the cutting area is divided. The cutting operation process is not simplified, resulting in a decrease in laser cutting efficiency.

[0005] In view of this, the present invention proposes a laser cutting method based on adaptive control to solve the above problems. Summary of the invention

[0006] In order to overcome the above-mentioned defects of the prior art and achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0007] A laser cutting method based on adaptive control, comprising:

[0008] Mark the current cutting position of the laser cutting head on the cutting path as the first position, and simultaneously obtain the thickness of the second position on the cutting path, wherein the second position is located in front of the first position, that is, the second position is an uncut position;

[0009] Collect cutting condition data of the workpiece to be cut, including melting point, standard thickness and ambient temperature;

[0010] According to the second position thickness continuously acquired in real time, the cutting path is divided into n sub-cutting areas, where n is an integer greater than 1, and the sub-cutting areas use the same cutting power; the standard thickness of the workpiece to be cut in the sub-cutting area is calculated according to the second position thickness in the sub-cutting area, and the workpiece to be cut in the sub-cutting area can be cut using the same cutting power;

[0011] The cutting condition data is input into the trained power identification model to obtain the cutting power of the sub-cutting area, and the cutting power is used as the cutting power when the laser cutting head moves to the sub-cutting area to cut the workpiece to be cut in the sub-cutting area.

[0012] Further, the thickness at the second position is obtained by a laser thickness gauge, and the obtaining method includes:

[0013] The laser thickness gauge is arranged in front of the laser cutting head through a connecting rod assembly. When the laser cutting head moves, the laser cutting head drives the laser thickness gauge to move on the cutting path through the connecting rod assembly, and continuously obtains the thickness at the second position in real time;

[0014] The second position thickness acquisition method includes:

[0015] The height of the laser thickness gauge from the laser cutting table is marked as H1, and the height of the laser thickness gauge from the surface of the workpiece to be cut is marked as H2. H3=H1-H2, where H3 is the thickness at the second position.

[0016] Furthermore, the method of dividing the cutting path into n sub-cutting areas includes:

[0017] Step S1, subtracting the second thickness obtained successively from the second thickness obtained successively, and continuously obtaining the absolute value of the difference between the second thickness at different positions on the cutting path and the second thickness obtained initially;

[0018] Step S2, if the absolute value of the difference is greater than a preset difference threshold, the position of the second thickness corresponding to the absolute value of the difference on the cutting path is taken as the end node, the position of the second position thickness obtained for the first time on the cutting path is taken as the start node, and the cutting path between the start node and the end node is taken as a sub-cutting area; in this way, it can be ensured that the thickness is divided into a sub-cutting area at the same time as laser cutting, and the same cutting power can be used to complete the cutting of the workpiece to be cut in the sub-cutting area;

[0019] Step S3: The end node in step S2 is used as the start node of the next sub-cutting area, and the thickness at the second position is obtained again;

[0020] Step S4, repeat steps S1-S3.

[0021] Furthermore, the training method of the power identification model includes:

[0022] Collect i groups of historical cutting condition data and the cutting power corresponding to the historical cutting condition data; use the historical cutting condition data and the cutting power corresponding to the historical cutting condition data as a sample set, divide the sample set into a training set and a test set, use the historical cutting condition data in the training set as the input of a power identification model, use the cutting power in the training set as the output of the power identification model, train the power identification model, and output a power identification model that meets a preset accuracy. The power identification model is preferably a naive Bayes model or a support vector machine model.

[0023] Furthermore, it also includes:

[0024] Establish a plane coordinate system in the cutting area of ​​the laser cutting table;

[0025] Map the preset cutting path to the plane coordinate system, obtain the coordinates of any position on the preset cutting path in the plane coordinate system, and obtain the coordinates of the laser emission end of the laser thickness gauge in real time;

[0026] If the coordinates of the laser emission end of the laser thickness gauge are inconsistent with the coordinates of any position on the preset cutting path in the plane coordinate system, a position correction instruction is generated;

[0027] The position of the laser emitting end of the laser thickness gauge is corrected according to the position correction instruction so that the position of the laser emitting end of the laser thickness gauge is located on the preset cutting path.

[0028] Furthermore, the method of establishing a plane coordinate system includes:

[0029] Take the position of any corner point of the laser cutting table as the coordinate origin, take the length direction of the laser cutting table as the horizontal axis, and take the width direction of the laser cutting table as the vertical axis to establish a plane coordinate system;

[0030] The method of obtaining the coordinates of the laser emission end of the laser thickness gauge in real time includes:

[0031] A position sensor is set just above the laser thickness gauge. The position sensor obtains the position of the laser emitting end of the laser thickness gauge in real time, and maps the position of the laser emitting end of the laser thickness gauge to the plane coordinate system in real time to obtain the position coordinates of the laser emitting end of the laser thickness gauge in the plane coordinate system.

[0032] Furthermore, the connecting rod assembly includes an adjustment motor, a first horizontal bar and a second horizontal bar, one end of the first horizontal bar is vertically fixed to the laser cutting head, the adjustment motor is fixed to the other end of the first horizontal bar, the rotating end of the adjustment motor is fixed to one end of the second horizontal bar, the second horizontal bar is located below the first horizontal bar, and the other end of the second horizontal bar is fixed to the laser thickness gauge.

[0033] Furthermore, the method of correcting the position of the laser emitting end of the laser thickness gauge according to the position correction instruction so that the position of the laser emitting end of the laser thickness gauge is located on the preset cutting path includes:

[0034] A circle is drawn with the rotating end of the adjustment motor as the center and the vertical distance from the center to the laser emission end of the laser thickness gauge as the radius to obtain a circular line. The laser cutting head drives the circular line to move on the preset cutting path to obtain the intersection of the circular line and the preset cutting path;

[0035] If there is only one intersection point, the intersection point is taken as the target intersection point. If the ordinate value of the laser emission end of the laser thickness gauge is less than the ordinate value of the target intersection point, it is located below the preset cutting path S. The control adjustment motor rotates counterclockwise in the direction of the longitudinal axis extension to adjust the coordinates of the laser emission end of the laser thickness gauge to the coordinate position of the target intersection point.

[0036] If there is only one intersection point, the intersection point is taken as the target intersection point. If the ordinate value of the laser emission end of the laser thickness gauge is greater than the ordinate value of the target intersection point, it is located above the preset cutting path S. The motor is controlled to rotate clockwise in the opposite direction of the longitudinal axis to adjust the coordinates of the laser emission end of the laser thickness gauge to the coordinate position of the target intersection point.

[0037] If there is only one intersection point, the intersection point is taken as the target intersection point. If the ordinate value of the laser emission end of the laser thickness gauge is equal to the ordinate value of the target intersection point, it is located on the preset cutting path S, and the control adjustment motor is not started;

[0038] If there are two intersecting points, the intersection point on the preset cutting path with the shortest distance to the end point of the preset cutting path is selected as the target intersection point. If the ordinate value of the laser emission end of the laser thickness gauge is less than the ordinate value of the target intersection point, the control adjustment motor is controlled to rotate counterclockwise in the direction of the longitudinal axis extension, and the coordinates of the laser emission end of the laser thickness gauge are adjusted to the coordinate position of the target intersection point;

[0039] If there are two intersecting points, the intersection point on the preset cutting path with the shortest distance to the end point of the preset cutting path is selected as the target intersection point. If the ordinate value of the laser emission end of the laser thickness gauge is greater than the ordinate value of the target intersection point, the control adjustment motor is controlled to rotate clockwise in the opposite direction of the longitudinal axis, and the coordinates of the laser emission end of the laser thickness gauge are adjusted to the coordinate position of the target intersection point;

[0040] If there are two intersecting points, the intersection point on the preset cutting path with the shortest distance to the preset cutting path end point is selected as the target intersection point. If the ordinate value of the laser emission end of the laser thickness gauge is equal to the ordinate value of the target intersection point, the control adjustment motor is not started.

[0041] Technical effects and advantages of a laser cutting method based on adaptive control of the present invention:

[0042] During the laser cutting process, the cutting path can be continuously divided, and at the same time, the thickness of a sub-cutting area can be divided during laser cutting, and the same cutting power can be used to complete the cutting of the workpiece to be cut in the sub-cutting area; compared with the existing technology, the cutting operation process is simplified, time is saved, and the cutting efficiency is higher; at the same time, based on the divided sub-cutting areas, the cutting power adjusted by the laser cutting head is more accurate, and the cutting quality is higher while ensuring the cutting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of a laser cutting system based on adaptive control in Example 1 of the present invention;

[0044] Figure 2 is a schematic diagram of a method for dividing sub-cutting regions in Embodiment 1 of the present invention;

[0045] Figure 3 Schematic diagram of the structure of the connecting rod assembly in Example 2 of the present invention;

[0046] Figure 4 Schematic diagram of a laser cutting system based on adaptive control in Embodiment 2 of the present invention;

[0047] Figure 5 Schematic diagram of the plane coordinate system in Embodiment 2 of the present invention;

[0048] Figure 6 A schematic diagram of a laser cutting method based on adaptive control according to the present invention;

[0049] Figure 7 The figure is a schematic diagram of an electronic device of the present invention.

[0050] Reference numerals:

[0051] 101, first horizontal bar; 102, adjustment motor; 103, second horizontal bar. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Example 1

[0054] See also Figure 1 As shown, this embodiment discloses a laser cutting system based on adaptive control, and the system is used to implement the steps in a laser cutting method based on adaptive control disclosed in the present application. The system includes a first data acquisition module, an area division module, a second data acquisition module and a power setting module, and each module is connected by wire and / or wireless means.

[0055] The first data acquisition module marks the current cutting position of the laser cutting head on the cutting path as the first position, and simultaneously obtains the thickness of the second position on the cutting path, wherein the second position is located in front of the first position in the cutting path direction, that is, the second position is an uncut position.

[0056] The thickness at the second position is obtained by a laser thickness gauge, and the obtaining method includes:

[0057] See also Figure 3 As shown, the laser thickness gauge is arranged in front of the laser cutting head through a connecting rod assembly. When the laser cutting head moves, the laser cutting head drives the laser thickness gauge to move on the cutting path through the connecting rod assembly, and continuously obtains the thickness of the second position in real time.

[0058] The second position thickness acquisition method includes:

[0059] See also Figure 3 As shown, the height of the laser thickness gauge from the laser cutting table is marked as H1, the height of the laser thickness gauge from the surface of the workpiece to be cut is marked as H2, H3=H1-H2, H3 is the thickness at the second position;

[0060] The area division module divides the cutting path into n sub-cutting areas according to the second position thickness continuously acquired in real time, where n is an integer greater than 1, and the sub-cutting areas use the same cutting power; the standard thickness of the workpiece to be cut in the sub-cutting area is calculated according to the second position thickness in the sub-cutting area, and the workpiece to be cut in the sub-cutting area can be cut using the same cutting power.

[0061] See also Figure 2As shown, specifically, the method of dividing the cutting path into n sub-cutting areas includes:

[0062] Step S1, subtract the second thickness obtained successively from the second thickness obtained initially, and continuously obtain the absolute value of the difference between the second thickness at different positions on the cutting path and the second thickness obtained initially.

[0063] Step S2, if the absolute value of the difference is greater than a preset difference threshold, the position of the second thickness corresponding to the absolute value of the difference on the cutting path is taken as the end node, the position of the second position thickness obtained for the first time on the cutting path is taken as the start node, and the cutting path between the start node and the end node is taken as a sub-cutting area; in this way, the thickness within a sub-cutting area can be divided while laser cutting, and the same cutting power can be used to complete the cutting of the workpiece to be cut in the sub-cutting area.

[0064] Step S3: The end node in step S2 is used as the start node of the next sub-cutting area, and the second position thickness is re-acquired as the first acquired second position thickness.

[0065] Step S4, repeat steps S1-S3;

[0066] In this way, during the laser cutting process, the cutting path can be continuously divided. Compared with the existing technology, the cutting operation process is simplified, time is saved, and the cutting efficiency is higher.

[0067] The preset difference threshold is set according to the melting point of the material of the workpiece to be cut. The higher the melting point, the smaller the corresponding preset difference threshold, and vice versa. It is specifically set by technical personnel according to actual conditions and no specific numerical limit is made here.

[0068] The second data acquisition module is used to collect cutting condition data of the workpiece to be cut, and the cutting condition data includes melting point, standard thickness and ambient temperature.

[0069] The power setting module inputs the cutting condition data into the trained power recognition model, obtains the cutting power of the sub-cutting area, and uses the cutting power as the cutting power when the laser cutting head moves to the sub-cutting area.

[0070] The training method of the power identification model includes:

[0071] Collect i groups of historical cutting condition data and the cutting power corresponding to the historical cutting condition data; use the historical cutting condition data and the cutting power corresponding to the historical cutting condition data as a sample set, divide the sample set into a training set and a test set, use the historical cutting condition data in the training set as the input of a power identification model, use the cutting power in the training set as the output of the power identification model, train the power identification model, and output a power identification model that meets a preset accuracy. The power identification model is preferably a naive Bayes model or a support vector machine model.

[0072] The historical cutting condition data are collected in an experimental environment. Multiple sets of cutting condition data are used in turn, and then multiple cutting powers are obtained by multiple cutting. The technicians select an optimal cutting power to correspond to it. The optimal cutting power corresponds to the best cutting quality. The cutting condition data in multiple groups are constantly changing, so that i sets of historical cutting condition data can be obtained.

[0073] In the laser cutting process, the present embodiment can continuously divide the cutting path, and at the same time can ensure that the thickness within a sub-cutting area is divided during laser cutting, and the same cutting power can be used to complete the cutting of the workpiece to be cut in the sub-cutting area; compared with the prior art, the cutting operation process is simplified, time is saved, and the cutting efficiency is higher; at the same time, based on the divided sub-cutting areas, the cutting power adjusted by the cutting system is more accurate, and the cutting quality is higher while ensuring the cutting efficiency.

[0074] Example 2

[0075] When the preset cutting path is a wavy line, such as Figure 5 As shown in the preset cutting path S, the second position thickness obtained by the laser thickness gauge will deviate from the preset cutting path, resulting in inaccurate acquisition of the second position thickness, which will cause the cutting power to not be well matched with the divided sub-cutting area, resulting in incomplete cutting or over-cutting; please refer to Figure 4 As shown, the laser cutting system based on adaptive control in this embodiment also includes a coordinate establishment module, a positioning module and a position correction module;

[0076] The coordinate establishment module is used to establish a plane coordinate system in the cutting area of ​​the laser cutting table; the method for establishing the plane coordinate system includes:

[0077] See also Figure 5 As shown, take the position of any corner point of the laser cutting table as the coordinate origin, take the length direction of the laser cutting table as the horizontal axis, that is, the x-axis; take the width direction of the laser cutting table as the vertical axis, that is, the y-axis, to establish a plane coordinate system;

[0078] The positioning module maps the preset cutting path to the plane coordinate system, obtains the coordinates of any position on the preset cutting path in the plane coordinate system, and obtains the coordinates of the laser emission end of the laser thickness gauge in real time;

[0079] The method of obtaining the coordinates of the laser emission end of the laser thickness gauge in real time includes:

[0080] A position sensor is arranged directly above the laser thickness gauge, and the position sensor obtains the position of the laser emitting end of the laser thickness gauge in real time, and maps the position of the laser thickness gauge to a plane coordinate system in real time, and obtains the position coordinates of the laser emitting end of the laser thickness gauge in the plane coordinate system;

[0081] A position correction module generates a position correction instruction if the coordinates of the laser emission end of the laser thickness gauge are inconsistent with the coordinates of any position on the preset cutting path in the plane coordinate system;

[0082] The connecting rod assembly corrects the position of the laser emitting end of the laser thickness gauge according to the position correction instruction so that the position of the laser emitting end of the laser thickness gauge is located on the preset cutting path;

[0083] See also Figure 3 As shown, the connecting rod assembly includes an adjustment motor 102, a first horizontal bar 101 and a second horizontal bar 103. One end of the first horizontal bar 101 is vertically fixed to the laser cutting head, the adjustment motor 102 is fixed to the other end of the first horizontal bar 101, the rotating end of the adjustment motor 102 is fixed to one end of the second horizontal bar 103, the second horizontal bar 103 is located below the first horizontal bar 101, and the other end of the second horizontal bar 103 is fixed to the laser thickness gauge;

[0084] The method for correcting the position of the laser emitting end of the laser thickness gauge according to the position correction instruction so that the position of the laser emitting end of the laser thickness gauge is located on the preset cutting path includes:

[0085] With the rotating end of the adjustment motor 102 as the center, draw a circle with the vertical distance from the center to the laser emission end of the laser thickness gauge as the radius to obtain a circular line. The circular line is as follows: Figure 5 In A, B, and C, the laser cutting head drives the circular line to move on the preset cutting path to obtain the intersection point where the circular line intersects the preset cutting path.

[0086] If there is only one intersection point, the intersection point is taken as the target intersection point. If the ordinate value of the laser thickness gauge is less than the ordinate value of the target intersection point, it is located below the preset cutting path S. The control adjustment motor 102 is controlled to rotate counterclockwise in the Y-axis extension direction to adjust the coordinates of the laser emitting end of the laser thickness gauge to the coordinate position of the target intersection point.

[0087] If there is only one intersection point, the intersection point is taken as the target intersection point. If the ordinate value of the laser thickness gauge is greater than the ordinate value of the target intersection point, it is located above the preset cutting path S. The control adjustment motor 102 is controlled to rotate clockwise in the opposite direction of the Y-axis to adjust the coordinates of the laser emitting end of the laser thickness gauge to the coordinate position of the target intersection point.

[0088] If there is only one intersection point, the intersection point is taken as the target intersection point. If the ordinate value of the laser thickness gauge is equal to the ordinate value of the target intersection point, it is located on the preset cutting path S, and the control adjustment motor 102 is not started. At this time, the laser cutting head drives the laser thickness gauge to adjust the coordinates of the laser emission end of the laser thickness gauge to the coordinate position of the target intersection point.

[0089] If there are two intersection points, such as Figure 5 As shown in point c1 and point c2, the intersection point with the shortest distance from the end point of the preset cutting path along the preset cutting path is selected as the target intersection point, that is, point c1 is used as the target intersection point. If the ordinate value of the laser thickness gauge is less than the ordinate value of the target intersection point, the control adjustment motor 102 is rotated counterclockwise in the direction of the Y-axis extension, and the coordinates of the laser emission end of the laser thickness gauge are adjusted to the coordinate position of the target intersection point;

[0090] If there are two intersecting points, the intersection point with the shortest distance from the end point of the preset cutting path along the preset cutting path is selected as the target intersection point. If the ordinate value of the laser thickness gauge is greater than the ordinate value of the target intersection point, the adjustment motor 102 is controlled to rotate clockwise in the opposite direction of the Y-axis extension, and the coordinates of the laser emission end of the laser thickness gauge are adjusted to the coordinate position of the target intersection point;

[0091] If there are two intersecting points, the intersection point with the shortest distance from the end point of the preset cutting path along the preset cutting path is selected as the target intersection point. If the ordinate value of the laser thickness gauge is equal to the ordinate value of the target intersection point, the control adjustment motor 102 is not started, and the coordinates of the laser emission end of the laser thickness gauge are adjusted to the coordinate position of the target intersection point;

[0092] In this embodiment, a circle is drawn with the rotating end of the adjustment motor 102 as the center and the vertical distance from the center to the laser emitting end of the laser thickness gauge as the radius to obtain a circular line. The laser cutting head drives the circular line to move on the preset cutting path to obtain the intersection of the circular line and the preset cutting path. According to the number of intersections, one intersection is selected as the target intersection. According to the relationship between the ordinate value of the laser emitting end of the laser thickness gauge and the ordinate value of the target intersection, the rotation direction of the adjustment motor 102 is controlled to adjust the coordinates of the laser emitting end of the laser thickness gauge to the coordinate position of the target intersection. When the laser emitting end of the laser thickness gauge is located at the same coordinate position as the target intersection, the laser thickness gauge is controlled to obtain the thickness at the second position, so that the thickness at the second position is the actual thickness on the preset cutting path on the piece to be cut, so that the cutting power can be well matched with the divided sub-cutting area, avoid the occurrence of incomplete cutting or over-cutting, improve the cutting quality of laser cutting, and save a set of XY two-axis positioning components, thereby reducing the manufacturing cost of the laser cutting machine.

[0093] Example 3

[0094] See also Figure 6 As shown, the part not described in detail in this embodiment can be seen in the description of embodiment 1, which provides a laser cutting method based on adaptive control, including:

[0095] Mark the current cutting position of the laser cutting head on the cutting path as the first position, and simultaneously obtain the thickness of the second position on the cutting path, wherein the second position is located in front of the first position, that is, the second position is an uncut position;

[0096] Collect cutting condition data of the workpiece to be cut, including melting point, standard thickness and ambient temperature;

[0097] According to the second position thickness continuously acquired in real time, the cutting path is divided into n sub-cutting areas, where n is an integer greater than 1, and the sub-cutting areas use the same cutting power; the standard thickness of the workpiece to be cut in the sub-cutting area is calculated according to the second position thickness in the sub-cutting area, and the workpiece to be cut in the sub-cutting area can be cut using the same cutting power;

[0098] The cutting condition data is input into the trained power identification model to obtain the cutting power of the sub-cutting area, and the cutting power is used as the cutting power when the laser cutting head moves to the sub-cutting area.

[0099] Example 4

[0100] See also Figure 7As shown, this embodiment discloses an electronic device 500. The electronic device 500 may include one or more processors and one or more memories. The memories store computer readable codes, and when the computer readable codes are executed by one or more processors, the method or system of the embodiment of the present application may also be used to Figure 7 The electronic device architecture shown in FIG. Figure 7 As shown, the electronic device 500 may include a bus 501, one or more CPUs 502, ROM 503, RAM 504, a communication port 505 connected to a network, an input / output 506, a hard disk 507, etc. The CPU is a central processing unit, the ROM is a read-only memory, and the RAM is a random access memory. The storage device in the electronic device 500, such as ROM 503 or hard disk 507, can store a laser cutting method based on adaptive control provided by the present application. Furthermore, the electronic device 500 may also include a user interface 508. Of course, Figure 7 The architecture shown is only exemplary and can be omitted according to actual needs when implementing different devices. Figure 7 One or more components of an electronic device are shown.

[0101] Example 5

[0102] This embodiment discloses a computer-readable storage medium, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, any one of the laser cutting methods based on adaptive control provided by the above methods is implemented.

[0103] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

[0104] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser cutting method based on adaptive control, characterized in that: include: Mark the current cutting position of the laser cutting head on the cutting path as the first position, and simultaneously obtain the thickness of the second position on the cutting path, wherein the second position is located in front of the first position, that is, the second position is an uncut position; Collect cutting condition data of the workpiece to be cut, including melting point, standard thickness and ambient temperature; According to the second position thickness continuously acquired in real time, the cutting path is divided into n sub-cutting areas, where n is an integer greater than 1, the sub-cutting areas use the same cutting power, and the standard thickness of the workpiece to be cut in the sub-cutting area is calculated according to the second position thickness in the sub-cutting area, and the workpiece to be cut in the sub-cutting area can be cut using the same cutting power; Inputting the cutting condition data into the trained power recognition model, obtaining the cutting power of the sub-cutting area, and using the cutting power as the cutting power when the laser cutting head moves to the sub-cutting area, cutting the workpiece to be cut in the sub-cutting area; The method further comprises: Establish a plane coordinate system in the cutting area of ​​the laser cutting table; Map the preset cutting path to the plane coordinate system, obtain the coordinates of any position on the preset cutting path in the plane coordinate system, and obtain the coordinates of the laser emission end of the laser thickness gauge in real time; If the coordinates of the laser emission end of the laser thickness gauge are inconsistent with the coordinates of any position on the preset cutting path in the plane coordinate system, a position correction instruction is generated; Correct the position of the laser emitting end of the laser thickness gauge according to the position correction instruction so that the position of the laser emitting end of the laser thickness gauge is located on the preset cutting path; Methods for establishing a plane coordinate system include: Take the position of any corner point of the laser cutting table as the coordinate origin, take the length direction of the laser cutting table as the horizontal axis, and take the width direction of the laser cutting table as the vertical axis to establish a plane coordinate system; The method of obtaining the coordinates of the laser emission end of the laser thickness gauge in real time includes: A position sensor is arranged directly above the laser thickness gauge, and the position sensor obtains the position of the laser emitting end of the laser thickness gauge in real time, and maps the position of the laser emitting end of the laser thickness gauge to a plane coordinate system in real time, and obtains the position coordinates of the laser emitting end of the laser thickness gauge in the plane coordinate system; The connecting rod assembly comprises an adjustment motor (102), a first horizontal bar (101) and a second horizontal bar (103); one end of the first horizontal bar (101) is vertically fixed to the laser cutting head; the adjustment motor (102) is fixed to the other end of the first horizontal bar (101); the rotation end of the adjustment motor (102) is fixed to one end of the second horizontal bar (103); the second horizontal bar (103) is located below the first horizontal bar (101); and the other end of the second horizontal bar (103) is fixed to the laser thickness gauge; The method for correcting the position of the laser emitting end of the laser thickness gauge according to the position correction instruction so that the position of the laser emitting end of the laser thickness gauge is located on the preset cutting path includes: A circle is drawn with the rotating end of the adjustment motor (102) as the center and the vertical distance from the center to the laser emission end of the laser thickness gauge as the radius to obtain a circular line, and the laser cutting head drives the circular line to move on a preset cutting path to obtain an intersection point where the circular line intersects with the preset cutting path; If there is only one intersection point, the intersection point is taken as the target intersection point. If the ordinate value of the laser emission end of the laser thickness gauge is less than the ordinate value of the target intersection point, it is located below the preset cutting path S, and the adjustment motor (102) is controlled to rotate counterclockwise in the direction of the longitudinal axis extension to adjust the coordinates of the laser emission end of the laser thickness gauge to the coordinate position of the target intersection point. If there is only one intersection point, the intersection point is taken as the target intersection point. If the ordinate value of the laser emission end of the laser thickness gauge is greater than the ordinate value of the target intersection point, it is located above the preset cutting path S, and the adjustment motor (102) is controlled to rotate clockwise in the opposite direction of the longitudinal axis extension, so as to adjust the coordinates of the laser emission end of the laser thickness gauge to the coordinate position of the target intersection point; If there is only one intersection point, the intersection point is taken as the target intersection point. If the ordinate value of the laser emission end of the laser thickness gauge is equal to the ordinate value of the target intersection point, it is located on the preset cutting path S, and the control adjustment motor (102) is not started; If there are two intersecting intersections, the intersection on the preset cutting path that is the shortest distance from the end point of the preset cutting path is selected as the target intersection; if the longitudinal coordinate value of the laser emitting end of the laser thickness gauge is less than the longitudinal coordinate value of the target intersection, the adjustment motor (102) is controlled to rotate counterclockwise in the longitudinal axis extension direction to adjust the coordinates of the laser emitting end of the laser thickness gauge to the coordinate position of the target intersection; If there are two intersecting intersections, the intersection on the preset cutting path that is the shortest distance from the end point of the preset cutting path is selected as the target intersection. If the longitudinal coordinate value of the laser emitting end of the laser thickness gauge is greater than the longitudinal coordinate value of the target intersection, the adjustment motor (102) is controlled to rotate clockwise in the opposite direction of the longitudinal axis extension, and the coordinate of the laser emitting end of the laser thickness gauge is adjusted to the coordinate position of the target intersection. If there are two intersecting intersections, the intersection on the preset cutting path with the shortest distance from the end point of the preset cutting path is selected as the target intersection. If the ordinate value of the laser emission end of the laser thickness gauge is equal to the ordinate value of the target intersection, the control adjustment motor (102) is not started.

2. The laser cutting method based on adaptive control according to claim 1, characterized in that: The thickness at the second position is obtained by a laser thickness gauge, and the obtaining method includes: The laser thickness gauge is arranged in front of the laser cutting head through a connecting rod assembly. When the laser cutting head moves, the laser cutting head drives the laser thickness gauge to move on the cutting path through the connecting rod assembly, and continuously obtains the thickness at the second position in real time; The second position thickness acquisition method includes: The height of the laser thickness gauge from the laser cutting table is marked as H1, and the height of the laser thickness gauge from the surface of the workpiece to be cut is marked as H2. H3=H1-H2, where H3 is the thickness at the second position.

3. The laser cutting method based on adaptive control according to claim 2, characterized in that: The method of dividing the cutting path into n sub-cutting areas includes: Step S1, subtracting the second thickness obtained successively from the second thickness obtained successively, and continuously obtaining the absolute value of the difference between the second thickness at different positions on the cutting path and the second thickness obtained initially; Step S2, if the absolute value of the difference is greater than a preset difference threshold, the position of the second thickness corresponding to the absolute value of the difference on the cutting path is taken as the end node, the position of the second position thickness obtained for the first time on the cutting path is taken as the start node, and the cutting path between the start node and the end node is taken as a sub-cutting area; Step S3: The end node in step S2 is used as the start node of the next sub-cutting area, and the thickness at the second position is obtained again; Step S4, repeat steps S1-S3.

4. The laser cutting method based on adaptive control according to claim 3, characterized in that: The training method of the power identification model includes: Collect i groups of historical cutting condition data and the cutting power corresponding to the historical cutting condition data; use the historical cutting condition data and the cutting power corresponding to the historical cutting condition data as a sample set, divide the sample set into a training set and a test set, use the historical cutting condition data in the training set as the input of the power identification model, use the cutting power in the training set as the output of the power identification model, train the power identification model, and output a power identification model that meets the preset accuracy, wherein the power identification model is either a naive Bayes model or a support vector machine model.

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