CN114654105A - Method, apparatus, system, device and medium for controlling laser cutting state - Google Patents
Method, apparatus, system, device and medium for controlling laser cutting state Download PDFInfo
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- CN114654105A CN114654105A CN202210165249.2A CN202210165249A CN114654105A CN 114654105 A CN114654105 A CN 114654105A CN 202210165249 A CN202210165249 A CN 202210165249A CN 114654105 A CN114654105 A CN 114654105A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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Abstract
The invention provides a method for controlling a laser cutting state, which is used for detecting the cutting process of a tool retracting section of a closed graph to be cut of a workpiece to be cut so as to determine the cutting state of laser cutting, and comprises the following steps: detecting original reflected light data of the workpiece to be cut in a cutting process in real time; processing the original reflected light data to obtain processed reflected light data, wherein the processed reflected light data is characterized by the intensity of reflected light of the workpiece to be cut in the cutting process; determining whether the closed figure has been cut based on the processed reflected light data; if the closed graph is cut off, stopping cutting; and if the closed graph is not cut off, returning to the step of detecting the original reflected light data of the workpiece to be cut in the cutting process in real time.
Description
Technical Field
The present invention relates to the field of laser cutting, and in particular, to a method, an apparatus, a system, a device, and a medium for controlling a laser cutting state.
Background
Laser cutting refers to irradiating a cut material by using a high-power-density laser beam, so that the material is quickly heated to a vaporization temperature, and holes are formed by evaporation. And along with the movement of the light beam to the material, the hole continuously forms a slit with a narrow width, and the cutting of the material is completed.
In the laser cutting process, the end point inner die of cutting is easy to hang a tumor when oxygen is used for cutting, the subsequent process of inserting the inner die into a pipe is seriously influenced, the pipe cannot be inserted, the secondary polishing is required to be carried out by using a special tool, and the production efficiency is seriously influenced.
In addition, when the cutting track is not completed, the workpiece to be cut can fall off, and laser still emits light at the moment, so that the workpiece to be cut can be damaged.
Disclosure of Invention
The invention provides a method, a device, a system, equipment and a medium for controlling a laser cutting state, which aim to solve the problems that a workpiece to be cut is easy to hang burrs and be damaged.
According to a first aspect of the present invention, there is provided a method for controlling a laser cutting state, for detecting a cutting progress of a tool retracting segment of a closed figure to be cut of a workpiece to be cut, so as to determine a cutting state of laser cutting, including:
s1: detecting original reflected light data of the workpiece to be cut in a cutting process in real time;
s2: processing the original reflected light data to obtain processed reflected light data, wherein the processed reflected light data is characterized by the intensity of reflected light of the workpiece to be cut in the cutting process;
s3: determining whether the closed figure has been cut based on the processed reflected light data;
if the closed graph is cut off, stopping cutting; if the closed figure is not cut, the flow returns to S1.
Optionally, in S2, the data processing on the original reflected light data includes:
s21: carrying out smooth filtering processing on the original reflected light data to obtain first reflected light data;
s22: carrying out mean value filtering processing on the first reflected light data to obtain second reflected light data;
s23: and carrying out differential processing on the second reflected light data to obtain the processed reflected light data.
Optionally, the determining whether the closed graph has been cut based on the processed reflected light data in S3 includes:
s31: judging whether the processed reflected light data is within a preset threshold interval or not; if not, returning to S1; if yes, go to S32;
s32: and confirming that the closed graph is cut off, and stopping cutting.
Optionally, the S31 specifically includes:
s311: judging whether the threshold value of the processed reflected light data is larger than a first preset threshold value or not; if yes, go to S312; if not, returning to S1;
s312: judging whether the threshold value of the processed reflected light data is smaller than a second preset threshold value or not; if yes, go to S32; if not, the process returns to S1.
Optionally, a value of the first preset threshold is 1.
Optionally, a value of the second preset threshold is 2.
Optionally, the stopping cutting comprises turning off the laser and turning off the assist gas.
Optionally, the S1 further includes before the step of:
s01, judging whether the cutting edge enters the closing section of the closed graph; if yes, go to S1; if not, waiting.
According to a second aspect of the present invention, there is provided a laser cutting state control device for controlling a cutting state of a laser cutting device at a cutting edge retracting section of a closed figure to be cut of a workpiece to be cut, the device comprising: a photoelectric sensor, a cutting head controller and a cutting system controller;
the photoelectric sensor is used for detecting the original reflected light data of the workpiece to be cut in the cutting process in real time;
the cutting head controller is used for carrying out data processing on the original reflected light data to obtain processed reflected light data, and the processed reflected light data is characterized by the intensity of reflected light of the workpiece to be cut in the cutting process;
the cutting system controller is used for determining whether the closed graph is cut off or not based on the processed reflected light data;
if the closed graph is cut off, controlling the laser cutting device to stop cutting; and if the closed graph is not cut off, controlling the photoelectric sensor to continuously detect the original reflected light data.
According to a third aspect of the present invention, there is provided a laser cutting system, comprising the laser cutting state control device described above, and a laser cutting device.
Optionally, the laser cutting device includes a laser and a laser cutting head.
According to a fourth aspect of the invention, there is provided an electronic device comprising a memory and a processor,
the memory is used for storing codes;
the processor is configured to execute the code in the memory to implement the method described above.
According to a fifth aspect of the invention there is provided a storage medium having stored thereon a program which, when executed by a processor, carries out the method described above.
According to the method, the device, the system, the equipment and the medium for controlling the laser cutting state, the cutting process of the cutter receiving section of the closed graph to be cut of the workpiece to be cut is detected, and if the closed graph is determined to be cut, cutting is stopped, so that the problem that the cutter receiving section of the workpiece to be cut is easy to hang a tumor is solved; and further, cutting is stopped when the closed graph is cut off, so that the problem that the workpiece to be cut is finally damaged due to the fact that the workpiece to be cut falls off and the laser continues to emit light is solved.
In addition, the cutting state of the workpiece to be cut is judged by detecting the original reflected light data of the workpiece to be cut in the cutting process, so that whether the workpiece to be cut is cut off can be judged more accurately, and light emission is stopped.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a first flowchart illustrating a method for controlling a laser cutting status according to an embodiment of the present invention;
FIG. 2 is a second flowchart illustrating a method for controlling a laser cutting status according to an embodiment of the present invention;
FIG. 3 is a third flowchart illustrating a method for controlling a laser cutting status according to an embodiment of the present invention;
FIG. 4 is a fourth flowchart illustrating a method for controlling a laser cutting status according to an embodiment of the present invention;
FIG. 5 is a block diagram of a laser cutting status control apparatus according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a laser cutting status control system according to an embodiment of the present invention;
FIG. 7 is a waveform diagram of signals after data processing in a method for controlling a laser cutting status according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an electronic device in an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Referring to fig. 1 and 7, the method for controlling a laser cutting state according to the present invention is used for detecting a cutting process of a cutting edge segment 61 of a closed pattern to be cut of a workpiece to be cut, so as to determine a cutting state of laser cutting, and the method includes:
s1: detecting original reflected light data of the workpiece to be cut in a cutting process in real time;
s2: processing the original reflected light data to obtain processed reflected light data, wherein the processed reflected light data is characterized by the intensity of reflected light of the workpiece to be cut in the cutting process;
s3: determining whether the closed figure has been cut based on the processed reflected light data;
if the closed graph is cut off, stopping cutting; if the closed figure is not cut, the process returns to S1.
Wherein, the retracting section 61 is characterized by a fixed distance of the tail end of the cutting track, and the cutting stopping comprises turning off the laser and turning off the auxiliary gas.
Specifically, the step S1 further includes:
s01, judging whether the cutting edge enters the closing section of the closed graph; if yes, go to S1; if not, waiting.
In one embodiment, the workpiece to be cut is carbon steel, and the auxiliary gas may be oxygen gas when the auxiliary gas is used to cut the carbon steel in the whole laser cutting process. Of course, the present invention is not so limited and other gases requiring other materials for the workpiece to be cut and additional gases are within the scope of the present invention.
In other embodiments, the workpiece to be cut includes an inner mold portion and/or an outer mold portion, and in an example application scenario, when the workpiece to be cut is a circular ring, the workpiece to be cut includes the inner mold portion and the outer mold portion.
In particular, the inner mould portion may be characterised by an inner diameter portion of a ring; the outer mold portion may be characterized as the outer diameter portion of a circular ring.
Of course, the present invention is not limited thereto, and it is within the scope of the present invention as long as the shape of the workpiece to be cut is a closed hollow shape, for example, a polygonal hollow shape.
Aiming at the problems that when carbon steel is cut by using oxygen, burrs are easily hung at the cutter retracting position of the inner mold part, a pipe cannot penetrate through the cutter retracting position, a special tool is needed for secondary grinding, the subsequent process of inserting the pipe into the inner mold is influenced, and the production efficiency is reduced, the method for controlling the laser cutting state is adopted for the cutter retracting section of the inner mold part, the cutting-off state of the workpiece to be cut is accurately judged, the cutting is stopped, the burrs are prevented from being hung at the cutter retracting position of the inner mold part, and the accuracy of the workpiece is ensured.
In addition, the method also aims at the problems that when the cutting track is not cut, the workpiece to be cut may fall due to the influence of gravity, the laser emits light at the moment, the integrity of the workpiece is damaged when the laser strikes the workpiece, and the qualification rate of the workpiece is influenced.
Referring to fig. 2, fig. 6 and fig. 7, regarding the procedure of the reflected light data processing, in step S2, the data processing on the raw reflected light data includes:
s21: carrying out smooth filtering processing on the original reflected light data to obtain first reflected light data;
s22: carrying out mean value filtering processing on the first reflected light data to obtain second reflected light data;
s23: and carrying out differential processing on the second reflected light data to obtain the processed reflected light data.
The original reflection data refers to an optical signal which is acquired by the photoelectric sensor 41 and reflected by the workpiece to be cut in the cutting process.
Wherein the smoothing filter is to filter out noise frequencies in the signal, and in an example, the smoothing filter further includes smoothing out outliers.
Specifically, after the cutting enters the last cutting interval (i.e. the cutting segment), the photoelectric sensor 41 samples the reflected light of the workpiece to be cut during cutting to obtain original reflected light data and a corresponding signal waveform diagram 62, and the cutting head controller 42 performs smooth filtering on the original reflected light data and removes abnormal points to obtain first reflected light data and a corresponding signal waveform diagram 63; the cutting head controller 42 performs an average filtering process on the first reflected light data to obtain second reflected light data and a corresponding signal waveform diagram 64; the cutting head controller 42 performs a differential process on the second reflected light data to obtain the processed reflected light data and a corresponding signal waveform diagram 65.
In one embodiment, referring to fig. 3, the step S3 of determining whether the closed graph has been cut based on the processed reflected light data includes:
s31: judging whether the processed reflected light data is within a preset threshold interval or not; if not, returning to S1; if yes, go to S32;
s32: and confirming that the closed graph is cut off, and stopping cutting.
In one embodiment, please refer to fig. 4, wherein the step S31 specifically includes:
s311: judging whether the threshold value of the processed reflected light data is larger than a first preset threshold value or not; if yes, go to S312; if not, returning to S1;
s312: judging whether the threshold value of the processed reflected light data is smaller than a second preset threshold value or not; if yes, go to S32; if not, return is made to S1.
In one example, the first preset threshold value is 1, and the second preset threshold value is 2.
Of course, the present invention is not limited thereto, and other values of the first preset threshold and the second preset threshold are within the protection scope of the present invention.
In a specific embodiment, the present invention may pre-adjust a set of cutting parameters (e.g., cutting speed and air pressure) for the thickness data or the thickness data interval of each workpiece to be cut, and then, when executing a cutting command, may read a set of process parameters adjusted for the actual thickness or the thickness interval where the actual thickness is located as the cutting parameters based on the actual thickness of the middle portion of the workpiece to be cut.
The thickness data can be represented as the thickness of part or all parts of the current workpiece to be cut, and can be understood as the size of the workpiece to be cut, which is perpendicular to the light emitting direction of the corresponding laser. As an implementation mode, the method further comprises the step of obtaining the drawing of the workpiece to be cut before cutting, after the drawing of the workpiece to be cut is obtained, the cutting technological parameters of the workpiece to be cut are set based on the drawing of the workpiece to be cut and the thickness data, and the cutting technological parameters of the workpiece to be cut comprise cutting air pressure and cutting speed.
Therefore, the method for controlling the laser cutting state provided by the invention can realize the process universality among different thicknesses of the workpiece to be cut and avoid the problem of repeated debugging.
Referring to fig. 5, the present invention further provides a laser cutting state control device 4, for controlling a cutting state of a laser cutting device in a cutting segment of a closed figure to be cut of a workpiece to be cut, including: a photoelectric sensor 41, a cutting head controller 42, and a cutting system controller 43;
the photoelectric sensor 41 is used for detecting the original reflected light data of the workpiece to be cut in the cutting process in real time;
and the cutting head controller 42 is configured to perform data processing on the original reflected light data to obtain processed reflected light data, where the processed reflected light data represents intensity of reflected light of the workpiece to be cut in a cutting process.
As a specific embodiment, the raw reflected light data is subjected to data processing by:
carrying out smooth filtering processing on the original reflected light data to obtain first reflected light data;
carrying out mean value filtering processing on the first reflected light data to obtain second reflected light data;
and carrying out differential processing on the second reflected light data to obtain the processed reflected light data.
The smoothing filtering, the mean filtering, and the differential processing are common data processing methods, and are not described herein again.
A cutting system controller 43 for determining whether the closed figure has been cut based on the processed reflected light data;
if the closed graph is cut off, controlling the laser cutting device to stop cutting; and if the closed graph is not cut off, controlling the photoelectric sensor to continuously detect the original reflected light data.
As a specific embodiment, whether the closed figure has been cut is determined by the following determination results:
judging whether the threshold value of the processed reflected light data is larger than a first preset threshold value or not;
and judging whether the threshold value of the processed reflected light data is smaller than a second preset threshold value.
Referring to fig. 6, the present invention further provides a laser cutting system, which includes the laser cutting status control device and the laser cutting device.
Optionally, the laser cutting device includes a laser 51 and a laser cutting head 52.
In a specific embodiment, when the laser cuts the workpiece 53 to be cut, the laser acts on the workpiece to be cut, and the photoelectric sensor 41 samples the reflected light of the workpiece 53 to be cut. The cutting head controller 42 performs filtering processing on the raw reflected light data sampled by the photosensor 41, and sends the processed reflected light data (i.e., the first reflected light data, the second reflected light data, and the processed reflected light data) to the cutting system controller 43. The cutting system controller 43 determines whether the closed pattern (i.e. the workpiece 53 to be cut) has been cut by detecting that the reflected light in the cutting process of the closed pattern (i.e. the workpiece 53 to be cut) and the reflected light when the cutting of the closed pattern (i.e. the workpiece 53 to be cut) is finished present different characteristic quantities.
Referring to fig. 8, an electronic device 7 is provided, which includes:
a processor 71; and the number of the first and second groups,
a memory 72 for storing executable instructions of the processor;
wherein the processor 71 is configured to perform the above-mentioned method via execution of the executable instructions.
The processor 71 is capable of communicating with the memory 72 via a bus 73.
Embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the above-mentioned method.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (13)
1. A method for controlling the laser cutting state is characterized in that the method is used for detecting the cutting progress of a tool retracting section of a closed graph to be cut of a workpiece to be cut so as to determine the cutting state of laser cutting, and comprises the following steps:
s1: detecting original reflected light data of the workpiece to be cut in a cutting process in real time;
s2: processing the original reflected light data to obtain processed reflected light data, wherein the processed reflected light data is characterized by the intensity of reflected light of the workpiece to be cut in the cutting process;
s3: determining whether the closed graph has been cut based on the processed reflected light data;
if the closed graph is cut off, stopping cutting; if the closed figure is not cut, the process returns to S1.
2. The method of controlling a laser cutting status as set forth in claim 1, wherein the data processing of the raw reflected light data in S2 includes:
s21: carrying out smooth filtering processing on the original reflected light data to obtain first reflected light data;
s22: carrying out mean value filtering processing on the first reflected light data to obtain second reflected light data;
s23: and carrying out differential processing on the second reflected light data to obtain the processed reflected light data.
3. The method for controlling a laser cutting state according to claim 2, wherein the determining whether the closed figure has been cut based on the processed reflected light data in S3 includes:
s31: judging whether the processed reflected light data is within a preset threshold interval or not; if not, returning to S1; if yes, go to S32;
s32: and confirming that the closed graph is cut off, and stopping cutting.
4. The method for controlling the laser cutting state according to claim 3, wherein the step S31 specifically comprises:
s311: judging whether the threshold value of the processed reflected light data is larger than a first preset threshold value or not; if yes, go to S312; if not, returning to S1;
s312: judging whether the threshold value of the processed reflected light data is smaller than a second preset threshold value or not; if yes, go to S32; if not, return is made to S1.
5. The method of claim 4, wherein the first predetermined threshold is 1.
6. The method of claim 4, wherein the second predetermined threshold value is 2.
7. The method of controlling the state of laser cutting according to any of claims 1-4, wherein stopping cutting includes turning off the laser and turning off the assist gas.
8. The method for controlling a laser cutting status according to any one of claims 1 to 4, wherein the S1 is preceded by:
s01, judging whether the cutting edge enters the closing section of the closed graph; if yes, go to S1; if not, waiting.
9. The utility model provides a laser cutting state controlling means for to the laser cutting device need cut the closed figure of work piece the cutting state of the receipts sword section of cutting control, its characterized in that includes: a photoelectric sensor, a cutting head controller and a cutting system controller;
the photoelectric sensor is used for detecting the original reflected light data of the workpiece to be cut in the cutting process in real time;
the cutting head controller is used for carrying out data processing on the original reflected light data to obtain processed reflected light data, and the processed reflected light data is characterized by the intensity of reflected light of the workpiece to be cut in the cutting process;
the cutting system controller is used for determining whether the closed graph is cut off or not based on the processed reflected light data;
if the closed graph is cut off, controlling the laser cutting device to stop cutting; and if the closed graph is not cut off, controlling the photoelectric sensor to continuously detect the original reflected light data.
10. A laser cutting system comprising the laser cutting state control device according to claim 10, and a laser cutting device.
11. The laser cutting system of claim 10, wherein the laser cutting device comprises a laser and a laser cutting head.
12. An electronic device, comprising a memory and a processor,
the memory is used for storing codes;
the processor configured to execute the code in the memory to implement the method of any one of claims 1 to 8.
13. A storage medium having a program stored thereon, the program being characterized in that it implements the method of any one of claims 1 to 8 when executed by a processor.
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| CN202210165249.2A CN114654105A (en) | 2022-02-16 | 2022-02-16 | Method, apparatus, system, device and medium for controlling laser cutting state |
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| CN103370164A (en) * | 2011-02-15 | 2013-10-23 | 通快激光与系统工程有限公司 | Method for monitoring cutting machining on a workpiece |
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Address after: 200241 No. 1000, Lanxiang Hunan Road, Minhang District, Shanghai Applicant after: SHANGHAI FRIENDESS ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 200241, room 1033, building B, 555 Dongchuan Road, Shanghai, Minhang District Applicant before: SHANGHAI FRIENDESS ELECTRONIC TECHNOLOGY Co.,Ltd. |