Laser cutting knife collection method and system

Abstract

The present invention relates to the technical field of laser cutting, and specifically discloses a laser cutting knife retracting method, comprising: starting laser cutting, performing laser cutting work based on a cutting signal, and obtaining cutting data of a cut piece; at the same time, obtaining real-time travel data of a laser cutting tool; the real-time travel data includes a laser cutting travel distance value; and obtaining a knife retracting signal; adjusting the laser cutting data; after the knife retracting is completed, obtaining the knife retracting cutting data in the remaining length of the cutting target, including a knife retracting cutting width value and a knife retracting cutting roughness value; judging whether the knife retracting cutting width value is within a cutting width value range, and at the same time, comparing the knife retracting cutting roughness value with the cut roughness value; and generating a knife retracting signal, which can effectively ensure that the cutting width and cutting roughness will not have abnormal problems during the knife retracting process, ensure the cutting stability during the laser cutting knife retracting process, and at the same time ensure the cutting quality during the laser cutting knife retracting process.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cutting, and in particular to a laser cutting knife retracting method and system. Background Art

[0002] Laser cutting refers to the use of a high-power density laser beam to irradiate the material to be cut, so that the material is quickly heated to the vaporization temperature, evaporated to form holes, and as the beam moves across the material, the holes continuously form a very narrow slit, completing the cutting of the material.

[0003] When laser cutting thick plates, affected by the weight of the workpiece, the workpiece will fall before the cutting track is completed. At this time, the laser is still emitting light, which will cause the surface and end face integrity of the cut workpiece to be destroyed. Therefore, in the laser cutting process, the control of the knife retraction is extremely important;

[0004] When the laser cutting knife is unstable, it is easy to cause abnormalities in cutting width and cutting surface roughness, affecting the qualified rate and accuracy of cutting knife. Summary of the invention

[0005] The object of the present invention is to provide a laser cutting knife retracting method and system to solve the above-mentioned background problems.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A laser cutting knife collection method, comprising:

[0008] Start laser cutting, perform laser cutting based on the cutting signal, and obtain cutting data of the cut piece, including a target length value BQc and a target width value BQk of the cut piece;

[0009] At the same time, the real-time travel data of the laser cutting tool is obtained; the real-time travel data includes the laser cutting travel distance value JQx;

[0010] The travel distance value JQx is calculated by ratio with the target length value BQc to obtain the laser cutting completion ratio xjb; and the knife closing signal is obtained;

[0011] Based on the knife-retracting signal, the laser cutting data at the current moment and the completed cutting data are obtained at the same time; the knife-retracting gas pressure value JSqy and the knife-retracting power value JSg are calculated and obtained;

[0012] Based on the knife-retracting signal, the laser cutting data is adjusted. Specifically, the cutting gas pressure value JQqy is adjusted to the gas pressure value JSqy, and the cutting power value JQg is adjusted to the knife-retracting cutting power value JSg. Then, the cutting speed is reduced from the cutting speed value JQs, and the reduction rate is the knife-retracting cutting speed value JSa, until the cutting speed becomes zero; and the knife-retracting cutting is performed on the cutting target remaining length value qsy; wherein, qsy=BQc-JQx;

[0013] After the knife is retracted, the knife-retracted cutting data in the remaining length of the cutting target is obtained, including the knife-retracted cutting width value Sk and the knife-retracted cutting roughness value Sc;

[0014] Determine whether the knife-retracting cutting width value Sk is within the cutting width value range [Ki n, Kax], and at the same time, compare the knife-retracting cutting roughness value Sc with the cut roughness value Yc; and generate a knife-retracting signal, wherein the knife-retracting signal includes a knife-retracting qualified signal, a power adjustment signal, an air pressure adjustment signal and a dual adjustment signal.

[0015] As a further solution of the present invention: judging whether the laser cutting completion ratio xjb reaches the preset cutting knife closing ratio sdb;

[0016] When the laser cutting completion ratio xjb is less than the preset cutting knife closing ratio sdb, the cutting signal is maintained;

[0017] When the laser cutting completion ratio xjb is equal to the cutting knife retraction preset ratio sdb, the cutting signal becomes the knife retraction signal.

[0018] As a further solution of the present invention: the cutting data includes a cutting power value JQg, a cutting speed value JQs and a cutting gas pressure value JQqy; the completed cutting data includes a cut width value Yk and a cut roughness value Yc.

[0019] As a further solution of the present invention: the calculation method of the knife-closing gas pressure value JSqy and the knife-closing power value JSg is:

[0020] A1: Calculate and obtain the cutting speed value JSa;

[0021] A2: Based on the cutting speed value JSa and the cut width value Yk, the cutting gas pressure value JSqy is calculated based on the width cutting model;

[0022] A3: Based on the cutting speed value JSa, the cutting gas pressure value JSqy and the cut roughness value Yc, based on the roughness cutting model, through the roughness cutting model.

[0023] The calculation method of the knife cutting speed value JSa is:

[0024] A11: Obtain the preset data of the cutting efficiency during the production process, that is, the total value T of the cutting time, and based on the travel distance value JQx and the cutting speed value JQs;

[0025] Calculate and obtain the knife closing time t;

[0026] A12: Based on the knife retraction time t, travel distance value JQx and target length value BQc

[0027] The cutting speed value JSa is calculated.

[0028] The training method of the width knife collection model is:

[0029] Obtain a test data set, including a knife retracting test speed value CSsa, a knife retracting test gas pressure value CSqy, and a knife retracting test width value CSk;

[0030] By training the test data set, the pressure reduction width influence coefficient a, the speed reduction width influence coefficient b and the width correction coefficient c are calculated;

[0031] The width cutting model is further obtained.

[0032] The training method of the roughness cutter model is:

[0033] Acquire a test data set, including a knife-closing test speed value CSsa, a knife-closing test gas pressure value CSqy, a knife-closing test power value CSg, and a knife-closing test roughness value CSc;

[0034] The roughness cutting model is further obtained.

[0035] As a further solution of the present invention: if the knife closing cutting width value Sk is within the cutting width value range [Ki n, Kax], and the knife closing cutting roughness value Sc is less than or equal to the cut roughness value Yc; a knife closing qualified signal is generated;

[0036] If the knife-retracted cutting width value Sk is within the cutting width value range [Ki n, Kax], and the knife-retracted cutting roughness value Sc is greater than the cut roughness value Yc; a power adjustment signal is generated;

[0037] If the knife-retracting cutting width value Sk is not within the cutting width value range [Ki n, Kax], and the knife-retracting cutting roughness value Sc is less than or equal to the cut roughness value Yc; generate an air pressure adjustment signal;

[0038] If the cutting width value Sk of the knife-retracting cutting is not in the cutting width value range [Ki n, Kax], and the roughness value Sc of the knife-retracting cutting is greater than the roughness value Yc of the cutting, a dual adjustment signal is generated.

[0039] As a further solution of the present invention: based on the power adjustment signal, the knife closing cutting power value JSg is adjusted to reduce the knife closing cutting roughness value Sc to the cut roughness value Yc, and at the same time, the updated knife closing cutting power value XSg after adjustment is obtained;

[0040] In the subsequent knife closing process, the knife closing power value XSg is updated to perform cutting and knife closing;

[0041] Based on the air pressure regulation signal or the dual regulation signal, the knife-closing gas pressure value JSqy is adjusted to make the knife-closing cutting width value Sk within the cutting width value range [Ki n, Kax], and the updated knife-closing gas pressure value XSqy after adjustment is obtained;

[0042] When the updated knife-closing gas pressure value XSqy is introduced into the roughness knife-closing model, the updated knife-closing cutting power value XSg is calculated, and the knife-closing cutting is performed with the updated knife-closing gas pressure value XSqy and the updated knife-closing cutting power value XSg.

[0043] As a further solution of the present invention: a laser cutting knife collection system, comprising:

[0044] Data acquisition module: used to start laser cutting, perform laser cutting based on cutting signals, and obtain cutting data of the cut piece, including a target length value BQc and a target width value BQk of the cut piece;

[0045] Signal generation module: used to obtain the real-time travel data of the laser cutting tool; the real-time travel data includes the laser cutting travel distance value JQx;

[0046] The travel distance value JQx is calculated by ratio with the target length value BQc to obtain the laser cutting completion ratio xjb; and the knife closing signal is obtained;

[0047] Signal processing module: Based on the knife-retracting signal, it obtains the laser cutting data at the current moment and the completed cutting data; calculates and obtains the knife-retracting gas pressure value JSqy and the knife-retracting power value JSg;

[0048] Knife retraction module: Based on the knife retraction signal, the laser cutting data is adjusted. Specifically, the cutting gas pressure value JQqy is adjusted to the gas pressure value JSqy, and the cutting power value JQg is adjusted to the knife retraction cutting power value JSg. Then, the cutting speed is reduced from the cutting speed value JQs, and the reduction rate is the knife retraction cutting speed value JSa, until the cutting speed becomes zero; and the knife retraction cutting is performed on the cutting target remaining length value qsy; wherein, qsy=BQc-JQx;

[0049] Feedback execution module: After the knife is retracted, the knife retracting cutting data in the remaining length of the cutting target is obtained, including the knife retracting cutting width value Sk and the knife retracting cutting roughness value Sc;

[0050] Determine whether the knife-retracting cutting width value Sk is within the cutting width value range [Ki n, Kax], and at the same time, compare the knife-retracting cutting roughness value Sc with the cut roughness value Yc; and generate a knife-retracting signal, wherein the knife-retracting signal includes a knife-retracting qualified signal, a power adjustment signal, an air pressure adjustment signal and a dual adjustment signal.

[0051] Beneficial effects of the present invention:

[0052] In the present invention, during the laser cutting process, when the cutting is about to be completed, it is necessary to control the laser cutting to retract the knife. At this time, it is necessary to control the cutting data during the retracting process to ensure that the cutting part during the retracting process will not have problems of abnormal cutting width or excessive roughness of the cutting plane. By monitoring the cutting width and cutting roughness during the laser cutting process, and adjusting the cutting power value and the cutting gas pressure value during the cutting process based on the retracting cutting data, it can be effectively ensured that the cutting width and cutting roughness during the retracting process will not have abnormal problems while ensuring the cutting efficiency remains unchanged, thereby ensuring the cutting stability during the laser cutting process and ensuring the cutting quality during the laser cutting process.

[0053] The width knife retraction model and the roughness knife retraction model are trained through the test data set. During the laser cutting process, the cutting power value and the cutting gas pressure value are calculated and obtained based on the cutting width value and the cutting roughness value in the cutting process. In this way, the cutting power value and the cutting gas pressure value that need to be adjusted can be quickly and effectively calculated based on the cutting speed value during the knife retraction process, thereby ensuring the accuracy of the cutting width value and the cutting roughness value during the knife retraction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The present invention will be further described below in conjunction with the accompanying drawings.

[0055] Figure 1 It is a schematic flow chart of the method of the present invention;

[0056] Figure 2 It is a system block diagram of the present invention. DETAILED DESCRIPTION

[0057] 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.

[0058] Embodiment 1

[0059] See also Figure 1 As shown, the present invention is a laser cutting knife collection method, comprising:

[0060] Step 01: Start laser cutting, perform laser cutting based on cutting signals, and obtain cutting data of the workpiece to be cut, including a target length value BQc and a target width value BQk of the workpiece to be cut;

[0061] At the same time, obtain the real-time travel data of the laser cutting tool;

[0062] Among them, the real-time travel data includes the laser cutting travel distance value JQx;

[0063] Step 02: Calculate the ratio of the travel distance value JQx to the target length value BQc to obtain the laser cutting completion ratio xjb;

[0064] Determine whether the laser cutting completion ratio xjb reaches the preset cutting knife closing ratio sdb;

[0065] When the laser cutting completion ratio xjb is less than the preset cutting knife closing ratio sdb, the cutting signal is maintained;

[0066] When the laser cutting completion ratio xjb is equal to the preset cutting knife closing ratio sdb, the cutting signal becomes the knife closing signal;

[0067] Step 03: Based on the knife retraction signal, the laser cutting data at the current moment and the completed cutting data are obtained at the same time;

[0068] The cutting data includes the cutting power value JQg, the cutting speed value JQs and the cutting gas pressure value JQqy; the completed cutting data includes the cut width value Yk and the cut roughness value Yc;

[0069] Calculate and obtain the knife closing gas pressure value JSqy and the knife closing power value JSg;

[0070] The specific steps include:

[0071] A1: Calculate and obtain the cutting speed value JSa;

[0072] include:

[0073] A11: Obtain the preset data of the cutting efficiency during the production process, that is, the total value T of the cutting time, and based on the travel distance value JQx and the cutting speed value JQs;

[0074] pass Calculate and obtain the knife closing time t;

[0075] A12: Based on the knife retraction time t, travel distance value JQx and target length value BQc

[0076] pass The cutting speed value JSa is calculated.

[0077] It should be noted that, because it is laser cutting, the cutting speed value JSa is a negative value;

[0078] A2: Based on the cutting speed value JSa and the cut width value Yk, based on the width cutting model pass The knife closing gas pressure value JSqy is calculated; wherein a is the influence coefficient of the closing pressure width, b is the influence coefficient of the closing speed width, and c is the width correction coefficient;

[0079] A3: Based on the cutting speed value JSa, the gas pressure value JSqy and the cut roughness value Yc, based on the roughness cutting model Cutting model by roughness The cutting power value JSg of the knife closing is calculated; among which, d is the roughness influence coefficient of the closing speed, e is the roughness influence coefficient of the closing pressure, f is the roughness influence coefficient of the closing power, and g is the roughness correction coefficient;

[0080] Step 04: Based on the knife-retracting signal, the laser cutting data is adjusted. Specifically, the cutting gas pressure value JQqy is adjusted to the gas pressure value JSqy, and the cutting power value JQg is adjusted to the knife-retracting cutting power value JSg. Then, the cutting speed is reduced from the cutting speed value JQs, and the reduction rate is the knife-retracting cutting speed value JSa, until the cutting speed becomes zero; and the knife-retracting cutting is performed on the cutting target remaining length value qsy; wherein, qsy=BQc-JQx;

[0081] Step 05: After the knife is retracted, the knife retracting cutting data in the remaining length of the cutting target is obtained, including the knife retracting cutting width value Sk and the knife retracting cutting roughness value Sc;

[0082] Determine whether the cut width Sk is within the cut width range [Ki n, Kax], and compare the cut roughness Sc with the cut roughness Yc;

[0083] and generating a knife-closing signal, wherein the knife-closing signal includes a knife-closing qualified signal, a power adjustment signal, an air pressure adjustment signal and a dual adjustment signal;

[0084] If the knife closing cutting width value Sk is within the cutting width value range [Ki n, Kax], and the knife closing cutting roughness value Sc is less than or equal to the cut roughness value Yc; a knife closing qualified signal is generated;

[0085] If the knife-retracted cutting width value Sk is within the cutting width value range [Ki n, Kax], and the knife-retracted cutting roughness value Sc is greater than the cut roughness value Yc; generate a power adjustment signal; execute step 06;

[0086] If the knife-retracting cutting width value Sk is not within the cutting width value range [Ki n, Kax], and the knife-retracting cutting roughness value Sc is less than or equal to the cut roughness value Yc; generate an air pressure adjustment signal; and execute step 07;

[0087] If the knife-retracted cutting width value Sk is not within the cutting width value range [Ki n, Kax], and the knife-retracted cutting roughness value Sc is greater than the cut roughness value Yc; generate a dual adjustment signal; and execute step 08;

[0088] Step 06: Based on the power adjustment signal, adjust the knife closing cutting power value JSg, so that the knife closing cutting roughness value Sc is reduced to the cut roughness value Yc, and at the same time obtain the adjusted updated knife closing cutting power value XSg;

[0089] In the subsequent knife closing process, the knife closing power value XSg is updated to perform cutting and knife closing;

[0090] Step 07: Based on the air pressure adjustment signal, adjust the knife closing gas pressure value JSqy so that the knife closing cutting width value Sk is within the cutting width value range [Ki n, Kax], and obtain the adjusted updated knife closing gas pressure value XSqy;

[0091] The updated knife closing gas pressure value XSqy is brought into the roughness knife closing model, and the updated knife closing cutting power value XSg is calculated and obtained, and the knife closing cutting is performed with the updated knife closing gas pressure value XSqy and the updated knife closing cutting power value XSg, and then step 05 is executed;

[0092] Step 08: Based on the dual adjustment signal, adjust the knife closing gas pressure value JSqy so that the knife closing cutting width value Sk is within the cutting width value range [Ki n, Kax], and obtain the updated knife closing gas pressure value XSqy after adjustment;

[0093] After the updated knife-closing gas pressure value XSqy is introduced into the roughness knife-closing model, the updated knife-closing cutting power value XSg is calculated, and the knife-closing cutting is performed with the updated knife-closing gas pressure value XSqy and the updated knife-closing cutting power value XSg, and then step 05 is executed.

[0094] During the laser cutting process, when the cutting is about to be completed, it is necessary to control the laser cutting to retract the knife. At this time, it is necessary to control the cutting data during the retracting process to ensure that the cutting part during the retracting process will not have abnormal cutting width or excessive cutting surface roughness problems. By monitoring the cutting width and cutting roughness during the laser cutting process, and adjusting the cutting power value and cutting gas pressure value during the cutting process based on the retracting cutting data, while ensuring the cutting efficiency remains unchanged, it can effectively ensure that the cutting width and cutting roughness during the retracting process will not have abnormal problems, thereby ensuring the cutting stability during the laser cutting process and ensuring the cutting quality during the laser cutting process.

[0095] Embodiment 2

[0096] The present invention is a laser cutting knife collection method, comprising:

[0097] The training methods of the width cutter model and the roughness cutter model are as follows:

[0098] Acquire a test data set, including a knife retracting test speed value CSsa, a knife retracting test gas pressure value CSqy, a knife retracting test power value CSg, a knife retracting test width value CSk, and a knife retracting test roughness value CSc;

[0099] By training on the test data set and The influence coefficient a of the contraction width, the influence coefficient b of the contraction speed width and the width correction coefficient c are calculated;

[0100] Further obtain the width cutting model

[0101] By training on the test data set and The roughness influence coefficient d of the speed collection, the roughness influence coefficient e of the pressure collection, the roughness influence coefficient f of the power collection and the roughness correction coefficient g are calculated;

[0102] Further obtain the roughness cutting model

[0103] The width knife retraction model and the roughness knife retraction model are trained through the test data set. During the laser cutting process, the cutting power value and the cutting gas pressure value are calculated and obtained based on the cutting width value and the cutting roughness value in the cutting process. In this way, the cutting power value and the cutting gas pressure value that need to be adjusted can be quickly and effectively calculated based on the cutting speed value during the knife retraction process, thereby ensuring the accuracy of the cutting width value and the cutting roughness value during the knife retraction process.

[0104] Embodiment 3

[0105] The present invention is a laser cutting knife collection method, comprising:

[0106] The width cut-off model and the roughness cut-off model are updated and trained, including the following steps:

[0107] Based on the updated knife-closing cutting power value XSg adjusted by the power regulation signal, the corresponding knife-closing cutting roughness value Yc, knife-closing cutting speed value JSa and knife-closing gas pressure value JSqy are obtained at the same time, and are introduced into the roughness knife-closing model and combined with the test data set, the roughness influence coefficient d of the closing speed, the roughness influence coefficient e of the closing pressure, the roughness influence coefficient f of the closing power and the roughness correction coefficient g are updated and trained; and the updated roughness knife-closing model is further obtained;

[0108] Based on the updated knife-closing gas pressure value XSqy and the updated knife-closing cutting power value XSg under the air pressure regulation signal or the dual regulation signal, the corresponding knife-closing cutting roughness value Yc, the knife-closing cutting speed change value JSa and the knife-closing cutting width value Sk are obtained at the same time, and in conjunction with the test data set, the pressure-closing width influence coefficient a, the speed-closing width influence coefficient b, the width correction coefficient c, the speed-closing roughness influence coefficient d, the pressure-closing roughness influence coefficient e, the power-closing roughness influence coefficient f and the roughness correction coefficient g are updated and trained to further obtain the updated width knife-closing model and the roughness knife-closing model.

[0109] When an abnormality occurs in the cutting process, the data in the laser cutting process can be quickly adjusted, and based on the adjustment results, new laser cutting data can be obtained. At the same time, the width cutting model and the roughness cutting model are updated and trained to further ensure the stability of the cutting process in the subsequent laser cutting process.

[0110] Embodiment 4

[0111] Reference Figure 2 As shown, a laser cutting knife collection system includes:

[0112] Data acquisition module: used to start laser cutting, perform laser cutting based on cutting signals, and obtain cutting data of the cut piece, including a target length value BQc and a target width value BQk of the cut piece;

[0113] Signal generation module: used to obtain the real-time travel data of the laser cutting tool; the real-time travel data includes the laser cutting travel distance value JQx;

[0114] The travel distance value JQx is calculated by ratio with the target length value BQc to obtain the laser cutting completion ratio xjb; and the knife closing signal is obtained;

[0115] Signal processing module: Based on the knife-retracting signal, it obtains the laser cutting data at the current moment and the completed cutting data; calculates and obtains the knife-retracting gas pressure value JSqy and the knife-retracting power value JSg;

[0116] Knife retraction module: Based on the knife retraction signal, the laser cutting data is adjusted. Specifically, the cutting gas pressure value JQqy is adjusted to the gas pressure value JSqy, and the cutting power value JQg is adjusted to the knife retraction cutting power value JSg. Then, the cutting speed is reduced from the cutting speed value JQs, and the reduction rate is the knife retraction cutting speed value JSa, until the cutting speed becomes zero; and the knife retraction cutting is performed on the cutting target remaining length value qsy; wherein, qsy=BQc-JQx;

[0117] Feedback execution module: After the knife is retracted, the knife retracting cutting data in the remaining length of the cutting target is obtained, including the knife retracting cutting width value Sk and the knife retracting cutting roughness value Sc;

[0118] Determine whether the knife-retracting cutting width value Sk is within the cutting width value range [Ki n, Kax], and at the same time, compare the knife-retracting cutting roughness value Sc with the cut roughness value Yc; and generate a knife-retracting signal, wherein the knife-retracting signal includes a knife-retracting qualified signal, a power adjustment signal, an air pressure adjustment signal and a dual adjustment signal.

[0119] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A laser cutting knife collection method, characterized in that: include: Start laser cutting, perform laser cutting based on the cutting signal, and obtain cutting data of the cut piece, including a target length value BQc and a target width value BQk of the cut piece; At the same time, the real-time travel data of the laser cutting tool is obtained; the real-time travel data includes the laser cutting travel distance value JQx; The travel distance value JQx is calculated by ratio with the target length value BQc to obtain the laser cutting completion ratio xjb; and the knife closing signal is obtained; Based on the knife-retracting signal, the laser cutting data at the current moment and the completed cutting data are simultaneously obtained; the knife-retracting gas pressure value JSqy and the knife-retracting power value JSg are calculated and obtained; Based on the knife-retracting signal, the laser cutting data is adjusted. Specifically, the cutting gas pressure value JQqy is adjusted to the knife-retracting gas pressure value JSqy, and the cutting power value JQg is adjusted to the knife-retracting power value JSg. Then, the cutting speed is reduced from the cutting speed value JQs, and the reduction rate is the knife-retracting cutting speed value JSa, until the cutting speed becomes zero; and the knife-retracting cutting is performed on the remaining cutting length value qsy; After the knife is retracted, the knife-retracted cutting data in the remaining length of the cutting target is obtained, including the knife-retracted cutting width value Sk and the knife-retracted cutting roughness value Sc; Determine whether the knife-retracting cutting width value Sk is within the cutting width value range [Kin, Kax], and at the same time, compare the knife-retracting cutting roughness value Sc with the cut roughness value Yc; and generate a knife-retracting signal, wherein the knife-retracting signal includes a knife-retracting qualified signal, a power adjustment signal, an air pressure adjustment signal and a dual adjustment signal.

2. A laser cutting knife collection method according to claim 1, characterized in that: Determine whether the laser cutting completion ratio xjb reaches the preset cutting knife retraction ratio sdb; when the laser cutting completion ratio xjb is less than the preset cutting knife retraction ratio sdb, maintain the cutting signal; when the laser cutting completion ratio xjb is equal to the preset cutting knife retraction ratio sdb, the cutting signal becomes the cutting knife retraction signal.

3. A laser cutting knife collection method according to claim 1, characterized in that: The cutting data includes a cutting power value JQg, a cutting speed value JQs and a cutting gas pressure value JQqy; the completed cutting data includes a cut width value Yk and a cut roughness value Yc.

4. The laser cutting knife collection method according to claim 1, characterized in that: The calculation method of the knife closing gas pressure value JSqy and the knife closing power value JSg is: A1: Calculate and obtain the cutting speed value JSa; A2: Based on the cutting speed value JSa and the cut width value Yk, the cutting gas pressure value JSqy is calculated based on the width cutting model; A3: Based on the cutting speed value JSa, the gas pressure value JSqy and the cut roughness value Yc, based on the roughness cutting model Cutting model by roughness The knife closing power value JSg is calculated and obtained; among them, d is the rough influence coefficient of closing speed, e is the rough influence coefficient of closing pressure, f is the rough influence coefficient of closing power, and g is the rough correction coefficient.

5. The laser cutting knife collection method according to claim 1, characterized in that: The calculation method of the knife cutting speed value JSa is: A11: Obtain the preset data of the cutting efficiency during the production process, that is, the total value T of the cutting time, and based on the travel distance value JQx and the cutting speed value JQs; Calculate and obtain the knife closing time t; A12: Based on the knife retraction time t, the travel distance value JQx and the target length value BQc; The cutting speed value JSa is calculated.

6. A laser cutting knife collection method according to claim 4, characterized in that: The training method of the width knife collection model is: Obtain a test data set, including a knife retracting test speed value CSsa, a knife retracting test gas pressure value CSqy, and a knife retracting test width value CSk; By training the test data set, the pressure reduction width influence coefficient a, the speed reduction width influence coefficient b and the width correction coefficient c are calculated; The width cutting model is further obtained.

7. A laser cutting knife collection method according to claim 4, characterized in that: The training method of the roughness cutter model is: Obtain a test data set, including a knife-closing test speed value CSsa, a knife-closing test gas pressure value CSqy, a knife-closing test power value CSg, and a knife-closing test roughness value CSc; The roughness cutting model is further obtained.

8. The laser cutting knife collection method according to claim 1, characterized in that: If the knife closing cutting width value Sk is within the cutting width value range [Kin, Kax], and the knife closing cutting roughness value Sc is less than or equal to the cut roughness value Yc; a knife closing qualified signal is generated; If the knife-retracted cutting width value Sk is within the cutting width value range [Kin, Kax], and the knife-retracted cutting roughness value Sc is greater than the cut roughness value Yc; a power adjustment signal is generated; If the knife-retracting cutting width value Sk is not within the cutting width value range [Kin, Kax], and the knife-retracting cutting roughness value Sc is less than or equal to the cut roughness value Yc; generate an air pressure adjustment signal; If the cutting width value Sk of the knife-retracting cutting is not in the cutting width value range [Kin, Kax], and the roughness value Sc of the knife-retracting cutting is greater than the roughness value Yc of the cutting, a dual adjustment signal is generated.

9. The laser cutting knife collection method according to claim 1, characterized in that: Based on the power adjustment signal, adjust the knife-retracting power value JSg to reduce the knife-retracting cutting roughness value Sc to the cut roughness value Yc, and at the same time obtain the adjusted updated knife-retracting cutting power value XSg; In the subsequent knife closing process, the knife closing is performed by updating the knife closing cutting power value XSg; Based on the air pressure adjustment signal or the dual adjustment signal, the knife-closing gas pressure value JSqy is adjusted to make the knife-closing cutting width value Sk within the cutting width value range [Kin, Kax], and the updated knife-closing gas pressure value XSqy after adjustment is obtained; Then, the updated knife-closing gas pressure value XSqy is brought into the roughness knife-closing model, and the updated knife-closing cutting power value XSg is calculated and obtained, and the knife-closing cutting is performed with the updated knife-closing gas pressure value XSqy and the updated knife-closing cutting power value XSg.

10. A knife collection system for laser cutting, the knife collection system being used to execute the knife collection method as described in any one of claims 1 to 9, comprising: Data acquisition module: used to start laser cutting, perform laser cutting based on cutting signals, and obtain cutting data of the cut piece, including a target length value BQc and a target width value BQk of the cut piece; Signal generation module: used to obtain the real-time travel data of the laser cutting tool; the real-time travel data includes the laser cutting travel distance value JQx; The travel distance value JQx is calculated by ratio with the target length value BQc to obtain the laser cutting completion ratio xjb; and the knife closing signal is obtained; Signal processing module: Based on the knife-retracting signal, it obtains the laser cutting data at the current moment and the completed cutting data; calculates and obtains the knife-retracting gas pressure value JSqy and the knife-retracting power value JSg; Cutting module: Based on the cutting signal, the laser cutting data is adjusted. Specifically, the cutting gas pressure value JQqy is adjusted to the cutting gas pressure value JSqy, and the cutting power value JQg is adjusted to the cutting power value JSg. Then, the cutting speed is reduced from the cutting speed value JQs, and the reduction rate is the cutting speed change value JSa until the cutting speed becomes zero; and the cutting target remaining length value qsy is cut; wherein, qsy=BQc-JQx; Feedback execution module: After the knife is retracted, the knife retracting cutting data in the remaining length of the cutting target is obtained, including the knife retracting cutting width value Sk and the knife retracting cutting roughness value Sc; Determine whether the knife-retracting cutting width value Sk is within the cutting width value range [Kin, Kax], and at the same time, compare the knife-retracting cutting roughness value Sc with the cut roughness value Yc; and generate a knife-retracting signal, wherein the knife-retracting signal includes a knife-retracting qualified signal, a power adjustment signal, an air pressure adjustment signal and a dual adjustment signal.

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