Method for laser cutting workpiece part from workpiece and laser cutting machine

Abstract

The invention relates to a method (100) for laser cutting a workpiece part (44) from at least one workpiece (40) by means of a laser beam (1) of a laser cutting machine (10), said method (100) comprising the following steps (102, 108, 110): ascertaining at least one material quality parameter (2) of the material quality of the at least one workpiece (40); determining at least one laser cutting parameter (2) for laser cutting the workpiece part (44), the at least one laser cutting parameter (5) being determined on the basis of the determined at least one material quality parameter (2); and laser cutting a workpiece part (44) from at least one workpiece (40) by means of a laser beam (1) of the laser cutting machine (10), the determined at least one laser cutting parameter (5) being used for the laser cutting process.

Description

Technical Field

[0001] The invention relates to a method and a laser cutting machine for laser cutting workpiece components from at least one workpiece by means of a laser beam. Background Art

[0002] It is known that the quality of laser-cut workpieces depends substantially on the quality of the raw material used and on the cut image (Schnittbild) produced during the laser cutting process. The cut image itself depends on the material quality, in particular on the material selection and the state of the workpiece used. This state can also change due to the type and duration of storage of the workpiece, for example due to corrosion. It has been found that due to these changes in the quality of the workpiece used, a cut image is often produced which itself can have specific quality defects, in particular with regard to the length of burrs, the roughness of the surface, the color of the cut (discoloration, ) or uncontrolled burning (in the case of oxygen cutting). Summary of the invention

[0003] The object of the present invention is to at least partially alleviate the above-mentioned quality defects of workpiece parts cut out during a laser cutting process in a laser cutting machine.

[0004] This object is achieved by a method according to claim 1. Therefore, a method for laser cutting a workpiece component from at least one workpiece by means of a laser beam of a laser cutting machine is proposed, wherein the method comprises the following steps:

[0005] - determining at least one material quality parameter of the material quality of the at least one workpiece;

[0006] - determining at least one laser cutting parameter for laser cutting a workpiece part, wherein the at least one laser cutting parameter is determined as a function of the at least one material quality parameter ascertained; and

[0007] Laser cutting a workpiece component from the at least one workpiece by means of a laser beam of a laser cutting machine, wherein the at least one determined laser cutting parameter is used for the laser cutting process.

[0008] According to the present invention, the material quality of one or more workpieces provided for laser processing is first determined, wherein one or more material quality parameters are determined, by which the material quality can be described in order to establish comparability between different material qualities. Then, one or more laser cutting parameters for the laser cutting process are determined according to the one or more material quality parameters. Of course, the determination of the laser cutting parameters does not have to be carried out only based on the at least one material quality parameter, but can also be based on other influencing factors, such as the working range of the laser cutting machine. More importantly, when determining the laser cutting parameters, the one or more material quality parameters are taken into account. Here, for the laser cutting process, the laser cutting process adapted to the material quality is implemented using the at least one laser cutting parameter previously determined. Therefore, the laser cutting process is adapted to the quality of the material of the one or more workpieces used by the method according to the present invention, so as to avoid quality defects in the manufactured workpiece parts. Here, the laser cutting process itself can be carried out according to a nesting plan, which predetermines (presets) the geometry of the workpiece parts to be cut out and can predetermine the positioning on the workpiece.

[0009] Different application methods can be used to determine the laser cutting parameters according to the material quality parameters so that the high quality or at least the required quality of the workpiece part is achieved. For example, a database can be used to determine the at least one laser cutting parameter, in which the optimal laser cutting parameters are provided in relation to the material quality parameters (and, if necessary, in relation to other correlations mentioned later for determining the laser cutting parameters). For example, such a database can be based on empirical values ​​and / or experiments. However, such a database can also be based on simulations. It is also possible to perform simulations of different laser cutting parameters for determined material quality parameters, in particular combinations of material quality parameters, and determine one or more laser cutting parameters, in particular a set of laser cutting parameters, based on the simulation results related to the quality of the cut workpiece part. Additionally or alternatively, artificial intelligence, in particular machine learning, can be used, for example, when determining the at least one laser cutting parameter.

[0010] In the present case, a workpiece is understood in particular to be a workpiece sheet or workpiece plate, which has its maximum extension in a horizontal plane and has a thickness in a vertical plane orthogonal to the horizontal plane. The workpiece can in particular be a workpiece metal plate. When a workpiece component connected to the workpiece by a preset breaking point has been machined in the workpiece, such a workpiece can also be referred to as a machined workpiece. Such a preset breaking point can in particular be designed in the form of a bridge between a workpiece component and the workpiece or with the remaining grid of the workpiece. Therefore, the preset breaking point ensures on the one hand that the workpiece and all workpiece components can be safely removed from the laser cutting machine, and on the other hand ensures that the workpiece component can be easily detached from the workpiece, and thus the workpiece component can be removed from the laser cutting machine.

[0011] The laser cutting process can be at least partially automated, in particular fully automated. The laser cutting machine used can be designed in particular as a flatbed machine (Flachbettwerkzeugmaschine), in particular a 2D laser flatbed machine. By means of the flatbed machine, the workpiece part is separated from the remaining part of the workpiece by means of laser cutting, and the shape of the workpiece part can be predetermined by the nesting plan of the flatbed machine. Therefore, in particular, the workpiece part is cut out from the workpiece by means of a laser beam. However, a preset breaking point that connects the workpiece part to the remaining part of the workpiece (also referred to as the remaining grid and forms reusable waste in some cases) can be left. Here, there can also be multiple preset breaking points between each workpiece part and the workpiece. Here, the workpiece processed in this way can be fed to a sorting process in or beside the laser cutting machine, because the workpiece part is still fastened to the remaining grid of the workpiece by means of the preset breaking point. The breaking of the preset breaking point or the detachment of the workpiece part from the remaining grid of the workpiece can be carried out manually, semi-automatically or fully automatically. For sorting, tools such as a shaker, a so-called vibration hammer or a drill can be used. The vibrator or vibrating hammer is used to periodically and repeatedly vibrate or impact the workpiece by means of vibration, so that the workpiece part is detached from the workpiece. The predetermined breaking point can be broken by drilling at the predetermined breaking point or, if necessary, at a drilling point provided next to the workpiece part, in particular a so-called micro joint.

[0012] It can be provided that the method further comprises a step of predetermining a target quality of the workpiece part, wherein the determination of the at least one laser cutting parameter is carried out in such a way that the predetermined target quality of the workpiece part is achieved during the laser cutting process. In other words, it can be provided that the required quality of the workpiece part is predetermined in the method. The target quality of the workpiece part itself can be made quantifiable by means of the workpiece quality parameter in order to establish comparability and evaluability. In this case, one or more laser cutting parameters can be determined in such a way that, in relation to the material quality parameter, it can be ensured that, in particular with a predefined expected value, the required quality of the workpiece part is (at least) achieved during the laser cutting process. This makes the method particularly efficient, since the pursuit of the maximum achievable workpiece part quality (which may not be necessary for the subsequent processing or use of the workpiece part) does not bring about other disadvantages, such as slow laser cutting, high wear or high energy and cutting gas consumption, which would occur in laser cutting processes with the highest quality requirements.

[0013] It can also be provided that at least one machine state parameter of the machine state of the laser cutting machine is also determined, and the at least one laser cutting parameter is also determined as a function of the at least one machine state parameter determined. As a result, further parameters that are determined to be relevant to the workpiece component quality can be incorporated into the method according to the invention in order to ensure the production of workpiece components of high workpiece component quality, in particular of the required workpiece component quality.

[0014] It can be provided that at least one machine state parameter describes at least one maintenance state and / or operating state of the laser cutting machine. The maintenance state and the operating state provide information about the reliability or error-free degree of the subsequent work of the laser cutting machine. Based on this, targeted control can be performed by determining the one or more laser cutting parameters. For example, the high tolerance of the laser cutting machine caused by insufficient maintenance or overdue maintenance can be targetedly controlled by low laser cutting speed and low laser cutting intensity as possible laser cutting parameters to reduce the tolerance. On the contrary, in the case of the best or most recently maintained laser cutting machine, the laser cutting parameters can be determined more based on one or more material quality parameters, because the negative impact of the machine state can be largely excluded. The same applies to the operating state. The operating state can, for example, explain: how long the laser cutting machine has been running in general or in the ongoing production cycle, whether the laser cutting machine has been preheated or whether a cold start is required for the laser cutting process, whether there is possible contamination, such as contamination of the protective glass of the laser cutting machine or whether there are defects, and / or the state of the various components of the laser cutting machine, such as the nozzle. The machine state parameters can be obtained using different modules or units of the laser cutting machine. For example, a maintenance recording module, a control unit, a sensor and / or a camera device can be used to determine the maintenance status and / or the operating status. A possible example of a sensor is a scattered light sensor, which can detect thermal excursions of the laser beam, for example due to contamination of the protective glass, by means of a scattered light analysis. Depending on the degree of contamination determined based on the scattered light analysis, a machine state parameter can be determined accordingly and used to determine the at least one laser cutting parameter. A focus position control that is dependent on the laser power and the beam on time can also be used to calculate the thermal excursion. In this case, for example, a low laser cutting speed can be selected as a laser cutting parameter in order to thereby compensate for contamination that is relevant to the quality of the workpiece part produced until the contamination has been eliminated.

[0015] It can also be provided that the at least one material quality parameter is determined based on workpiece data from the manufacturer and / or based on measurement data from a measurement of the at least one workpiece by means of at least one sensor and / or at least one camera device. It is particularly advantageous to use both workpiece data from the manufacturer and measurement data in order to be able to determine material quality parameters that are as realistic and diverse as possible, which advantageously provides a large amount of data for determining one or more laser cutting parameters. In this case, the workpiece data from the manufacturer may sometimes provide material quality parameters that differ from the measurement data. It is also possible to verify and check the workpiece data from the manufacturer by means of measurement data. In this way, confusion of the workpiece, erroneous information in the workpiece data, or outdated information, such as the workpiece is no longer rust-free after long-term storage or transportation defects, can be discovered and taken into account in the method. This ensures that the material quality is correctly determined and the required target workpiece quality is guaranteed by appropriately selecting one or more laser cutting parameters.

[0016] It can also be provided that the at least one material quality parameter indicates at least one of the following: material composition, material grain size Surface quality and / or material condition. It has been shown that the above-mentioned material quality parameters, in conjunction with the determined laser cutting parameters, are of high importance for the subsequent workpiece component quality.

[0017] It can also be provided that the at least one laser cutting parameter specifies at least one of the following: laser cutting power, laser cutting feed, focus position, focus diameter, nozzle position and / or laser cutting gas pressure. It has been shown that the above laser cutting parameters are particularly suitable for regulating the laser cutting process, on the one hand, in order to achieve the desired target workpiece quality and, on the other hand, to avoid disadvantages in the laser cutting process.

[0018] In particular, it can be provided that the method can also have the following further steps:

[0019] - generating measurement data relating to the workpiece component, the at least one workpiece and / or the laser cutting process by means of at least one sensor and / or at least one camera device;

[0020] - analyzing the measurement data to determine the actual quality of the workpiece component; and

[0021] - Based on the analyzed actual quality of the workpiece component, in particular in comparison with a predefined target quality of the workpiece component, the at least one laser cutting parameter is adapted.

[0022] By measuring the workpiece part and / or the at least one workpiece and / or by monitoring the laser cutting process, a check of the achieved workpiece part quality can be provided during or between the laser cutting processes, wherein during the laser cutting process, in particular in the case where the workpiece part quality determined by analyzing the measurement data is below a predetermined workpiece part target quality, a targeted control can also be performed by adapting one or more laser cutting parameters. In order to generate the measurement data, for example, a light cross section can be recorded to measure the burr height and / or a bright field image of the cutting edge can be recorded to determine the grain map and discoloration. The analysis of the measurement data for determining the actual quality of the workpiece part can also be assisted by artificial intelligence, in particular machine learning. As a result, the analysis of, for example, sensor images and / or camera device images can become increasingly better, so that the actual quality of the workpiece part can be determined faster and more accurately. It is also possible that if the workpiece part quality is (significantly) higher than the predetermined workpiece quality, one or more laser cutting parameters are adapted, for example to speed up the laser cutting process. As already mentioned, high quality is also accompanied by disadvantages in terms of process guidance, in particular in terms of process duration and costs associated with laser cutting. If a specific high quality is not desired, the above-described method can ensure that the desired workpiece component quality is produced essentially exactly. Therefore, the one or more laser cutting parameters determined at the beginning represent only an initial configuration for the start or initial laser cutting process of the laser cutting process. This initial configuration with one or more laser cutting parameters can be adapted as described above to a processing configuration determined for further laser cutting processes to achieve a predetermined workpiece component target quality.

[0023] It can be provided that the steps of generating (in particular by measuring and / or monitoring), analyzing and adapting are repeated, in particular until the actual workpiece component quality corresponds at least to a predefined workpiece component quality. The laser cutting parameters can thus be adapted step by step and continuously until the required workpiece component target quality is achieved. Of course, measurement data can also be generated by measuring and / or monitoring, and these measurement data can be analyzed to determine the actual workpiece component quality in order to ensure that the achieved actual workpiece component quality can be maintained during the further laser cutting process.

[0024] It can also be provided that the at least one sensor and / or the at least one camera device comprises at least one of the following: a deslagging unit for detecting the jet beam (Sprühstrahl) during laser cutting, a spark detection unit for detecting the spark size and / or spark brightness during laser cutting, a line spectrum sensor for detecting spectral lines during laser cutting, and a hyperspectral camera device for detecting the temperature trend during laser cutting. The above-mentioned detectors have proven to be particularly advantageous because they enable the precise determination of the actual quality of the workpiece part. In addition, the laser cutting process can also be advantageously monitored by them. For example, an evaluation of the sparks during the start of cutting (Anschnitt) / penetration into the workpiece can be performed, which evaluation enables the number and size of the sparks to be determined. The determination of the viscosity of the melt or the appearance of the jet beam can also be used to analyze the melt discharge and thus the actual quality of the workpiece part. In addition to the advantageous evaluation of the line spectra, slag removal and thus the cutting quality and workpiece component quality can also be detected by using a hyperspectral camera which offers the possibility of measuring in a larger wavelength range, for example measuring heat traces.

[0025] In particular, it can be provided that the at least one sensor and / or the at least one camera is a multiple detection system having at least two sensors and / or at least two cameras and / or at least one sensor and at least one camera. Such a multiple detection system can improve the measurement data situation by increasing the amount of available data. This also provides a higher monitoring reliability for situations where the detection units fail or do not provide usable measurement data. The increased amount of measurement data can ensure a more reliable and more precise analysis of the measurement data in order to determine the actual quality of the workpiece component.

[0026] The object mentioned at the outset is also achieved by a laser cutting machine according to claim 12. The laser cutting machine is configured for laser cutting workpiece parts from at least one workpiece by means of a laser beam from a laser cutting head of the laser cutting machine, wherein the laser cutting machine has:

[0027] a determination module for determining at least one material quality parameter of the material quality of the at least one workpiece;

[0028] a determination module for determining at least one laser cutting parameter for laser cutting a workpiece component, wherein the at least one laser cutting parameter is determined as a function of the at least one material quality parameter ascertained; and

[0029] - A control module for controlling laser cutting of a workpiece component from the at least one workpiece by means of a laser beam from a laser cutting head under use of the at least one laser cutting parameter determined.

[0030] Features described in this text with regard to the method also apply to the laser cutting machine, and vice versa.

[0031] The laser cutting machine according to the invention thus has the same advantages as have been explained in detail with reference to the method according to the invention. In particular, the laser cutting machine can be designed or configured for carrying out the method according to the invention.

[0032] Here, the modules of the laser cutting machine can be implemented, for example, by separate computer program codes or by a common computer program code, by separate functional units of a computer or by a common functional unit and / or a control unit and / or other units. For example, the acquisition module can be designed as a reading unit, for example, a reading program code, a memory of a computer and / or a sensor and / or a camera device of a laser cutting machine. It is also possible that the individual modules are partially or completely implemented in a common module, for example, the acquisition module and the determination module can be such. For example, these modules of the laser cutting machine can be implemented in a control device of the laser cutting machine.

[0033] It may be provided that the laser cutting machine further comprises a further ascertainment module for ascertaining a machine state parameter of a machine state of the laser cutting machine, and the determination module is configured to also determine the at least one laser cutting parameter as a function of the at least one ascertained machine state parameter.

[0034] In this case, it can be provided that the further ascertainment module is a machine recording module or has a machine recording module, by means of which the machine state parameter is recorded.

[0035] In particular, the laser cutting machine can be set to:

[0036] at least one sensor and / or at least one camera device for generating measurement data relating to a workpiece component, the at least one workpiece and / or the laser cutting process;

[0037] an analysis module for analyzing the measurement data to determine the actual quality of the workpiece component; and

[0038] An adaptation module for adapting the at least one laser cutting parameter based on the ascertained actual quality of the workpiece part, in particular in comparison with a predefined target quality of the workpiece part.

[0039] In addition to the modules mentioned, the laser cutting machine can of course have other modules and components, such as the previously mentioned database, an artificial intelligence and / or simulation module for determining one or more laser cutting parameters, and a pre-determined module for pre-determining the quality of a workpiece component, etc.

[0040] Further details and advantageous configurations of the invention can be gathered from the following description, according to which embodiments of the invention are described and explained in more detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In the attached picture:

[0042] Figure 1 A perspective view of a laser cutting machine according to an embodiment of the present invention is shown;

[0043] Figure 2 Shown as Figure 1 A schematic diagram of a laser cutting device of a part of a laser cutting machine;

[0044] Figure 3 Shows Figure 2 A schematic diagram of a control device for a laser cutting device;

[0045] Figure 4 The first embodiment of the present invention is shown. Figure 1 Schematic diagram of the laser cutting process implemented by the laser cutting machine;

[0046] Figure 5 The second embodiment of the present invention is shown. Figure 1 A schematic diagram of a laser cutting process implemented by a laser cutting machine; and

[0047] Figure 6 The third embodiment of the present invention is shown. Figure 1 Schematic diagram of the laser cutting process implemented by the laser cutting machine.

[0048] In the following description and in the drawings, the same reference numerals are used for features that are identical or correspond to one another. DETAILED DESCRIPTION

[0049] Figure 1 A laser cutting machine 10 in the form of a laser cutting flatbed machine having a laser cutting device 20 is shown, in which a laser beam 1 (see Figure 2 ) performs the laser cutting process. In particular, the control device 50 (see Figure 2 ) guides the focal point of the laser beam 1 along a predetermined cutting contour 42 arranged in the cutting area on a plate-like workpiece 40, in particular a metal plate extending substantially two-dimensionally, so as to cut a workpiece part 44 having a specific shape predetermined according to a nesting plan from the plate-like workpiece. Here, the nesting plan can be predetermined by a control plan for the control device 50.

[0050] Here, exemplarily, the laser cutting machine 10 further includes a removal device 30. For better illustration, the removal device 30 is shown as open here, but alternatively can be like Figure 1 The removal device 30 is partially or completely enclosed, like the laser cutting device 20 in FIG. 1 . Here, the removal device 30 comprises, for example, a pallet changer 32. The pallet changer 32 is designed to accommodate one or more pallets 38 during production. The workpiece 40 to be cut (as raw material or starting material), in particular a workpiece sheet, can be placed and supported on the pallet 38 and introduced into the housing of the laser cutting device 20 for the laser cutting process. After the cutting process is completed, the removal device 30 is removed. Figure 1 As shown, the pallet 38 can be removed from the laser cutting device 20 together with the processed workpiece 40 , so that the workpiece parts 44 cut according to the control plan can be sorted from the workpiece remainder remaining from the workpiece 40 and removed from the laser cutting machine 10 .

[0051] Figure 2 The laser cutting process in the laser cutting device 20 is shown. The laser cutting head 24, which is controlled by the control device 50 and emits a laser beam 1 for cutting a workpiece component 44 from the workpiece 40 onto the workpiece 40, can be freely positioned in the cutting area, so that the laser beam 1 can be guided along essentially any two-dimensional cutting contour 42 on the workpiece 40 to be cut. In this case, the cutting contour 42 for the laser beam 1 is predetermined in each case according to a nesting plan in the control device 50 in order to cut the workpiece component 44 from the workpiece 40. The nesting plan describes the arrangement of the individual workpiece components 44 in the workpiece 40, such as Figure 1 Furthermore, the nesting plan can include specifications for the penetration point and the predetermined starting cut for penetrating the laser beam 1 and for guiding the laser beam 1 along the starting cut to the cutting contour 42 (not shown).

[0052] During laser cutting, the laser beam 1 heats the metal of the workpiece 40 along a predetermined cutting contour 42 until the metal melts. A cutting gas jet, in particular consisting of nitrogen or oxygen, can leave the laser cutting head 24 in the region of the laser beam 1 and push the molten material of the workpiece 40 downward and out of the resulting gap. As a result, the workpiece 40 is completely cut through by the laser beam 1 during cutting.

[0053] To cut out the workpiece part 44, the laser beam 1 is moved along a predetermined cutting contour 42 of the respective workpiece 40. This starts at one of the aforementioned penetration points outside the workpiece 40 and then approaches the contour of the workpiece 40, in particular with an arc-shaped start cut.

[0054] In the illustrated embodiment, the pallet 38 has a workpiece support. The workpiece support has a plurality of support bars 34 which extend transversely, in particular perpendicularly, to the insertion direction of the workpiece 40 into the laser cutting device 20 and are oriented parallel to one another. The support bars 34 form a support area 36 on which the workpiece 40 rests or is supported. The support area 36 thus forms a grid of areas that can influence the laser cutting process and the removal of the workpiece parts 44 cut therefrom.

[0055] Figure 1 Also shown is a camera device 22 of the laser cutting machine 10, which is arranged by way of example on the laser cutting device 20 or its housing. The camera device 22 can be part of the determination module 51 of the control device 50 of the laser cutting machine or can be connected to the determination module. The camera device 22 is shown here purely by way of example and, for better illustration, is directed toward the removal device 30 and can alternatively or additionally also be directed toward the laser cutting device 20, in particular arranged in the housing of the laser cutting device 20. Furthermore, alternatively or in addition to the camera device 22, a sensor can also be used.

[0056] Figure 3 The control device 50 and its individual modules of the laser cutting device 20 of the laser cutting machine 10 are shown in an exemplary and schematic manner. In the present example, these modules are an ascertainment module 51, a further ascertainment module 52, a presetting module 53, a determination module 54, an analysis module 55, an adaptation module 56 and a control module 57. Alternatively, however, fewer modules can also be used, as is shown in the exemplary embodiment of the method 100 according to the invention described below.

[0057] Figure 4 Schematically shows the use of Figure 1 A first exemplary embodiment of a method 100 for laser cutting a workpiece component 44 from at least one workpiece 40 using a laser beam 1 of a laser cutting head 24 of a laser cutting device 20 of a laser cutting machine 10 .

[0058] In a first step 102 of the method 100, material quality parameters 2 of the material quality of a workpiece 40 are determined by means of a determination module 51, from which workpieces 44 are to be cut according to a predetermined nesting plan. This can preferably be performed based on workpiece data from the manufacturer and based on measurement data from a measurement of the at least one workpiece 40 by means of a sensor and / or camera device 22, which sends its measurement data to the determination module 51. The measurement data can be detected when the workpiece 40 is in the laser cutting machine 10, for example, on the removal device 30 or in the laser cutting device 20. The determination module 51 determines the material quality parameters 2 based on the measurement data and the workpiece data from the manufacturer. The different material quality parameters 2 determined in this way can, for example, indicate the material composition, the grain size of the material, the surface quality and / or the material state. These material quality parameters 2 can describe the material quality of the workpiece 40 very accurately, from which the workpiece parts 44 are to be cut from the workpiece 40 by the laser cutting machine 10 according to the nesting plan.

[0059] In parallel with step 102 or before or after step 102, step 104 of method 100 is performed, in which a machine state parameter 3 is determined by a further determination module 52, which machine state parameter can, for example, describe a maintenance state and / or an operating state of the laser cutting machine 10, in particular the laser cutting device 20. The further determination module 52 can, for example, be a machine recording module or include a machine recording module, in particular for recording maintenance of the laser cutting machine 10, with the aid of which the machine state parameter 3 is recorded.

[0060] The determined material quality parameters 2 and machine state parameters 3 are transmitted to the determination module 54, which determines, in step 108 of the method 100, a plurality of laser cutting parameters 5 for a laser cutting process for laser cutting a workpiece part 44 from a workpiece 40, which are adapted to the previously determined material quality parameters 2 and machine state parameters 3. The different laser cutting parameters 5 determined in this way can specify, for example, laser cutting power, laser cutting feed, focal position, focal diameter, nozzle position and laser cutting gas pressure, so as to be implemented by the control module 57 of the control device 50 of the laser cutting device 20.

[0061] In step 110 of the method 100, the control module 57 uses the previously determined laser cutting parameters 5 to control the laser cutting process of laser cutting a workpiece part 44 from the workpiece 40 by means of the laser beam 1. This ensures that during the laser cutting, the laser cutting parameters 5 are adapted to the material quality of the workpiece 40 and the machine state of the laser cutting machine 10, so that a high workpiece part quality of the produced workpiece part 44 is achieved.

[0062] In method 100 according to Figure 5 In the second embodiment of the present invention, a presetting module 53 of the control device 50 is also used. In step 106, the presetting module 53 presets the required workpiece part target quality 4. The presetting workpiece part target quality 4 is transmitted to the determination module 54. The determination module 54 also adapts the laser cutting parameters 5 to the required workpiece part target quality 4 in order to ensure that the workpiece part target quality is achieved on the manufactured workpiece part 44 under the conditions of the determined material quality parameters 2 and the determined machine state parameters 3.

[0063] Figure 6 The third embodiment of the method 100 is embodied, and the third embodiment also uses the analysis module 55 and the adaptation module 56 of the control device 50. Here, first, according to Figure 5 The second embodiment of the present invention performs the method 100 in steps 102, 104, 106, 108 and 110. However, Figure 5 In contrast, only an initial configuration of the determined laser cutting parameters 5 for the initial laser cutting process carried out in step 110 is determined in this way.

[0064] In a further step 112, the initial laser cutting process is monitored by the at least one camera device 22 and / or the at least one sensor. In this case, measurement data 6 are recorded or generated. These measurement data 6 are transmitted to an analysis module 55, which analyzes these measurement data in order to determine the actual workpiece part quality 7 of the workpiece parts 44 cut so far. Based on the comparison of the actual workpiece part quality 7 with the predetermined workpiece part target quality 4, it is determined whether the initially configured laser cutting parameters 5 should be adapted. If the actual workpiece part quality 7 does not yet correspond to or does not yet exceed the predetermined workpiece part target quality 4, the adaptation is performed by the adaptation module 56 in step 116 of the method 100. The laser cutting parameters 5 adapted in this way are fed back to step 110, i.e., to the laser cutting process, in order to continue the interrupted laser cutting process with the adapted laser cutting parameters 5, or to continue the ongoing laser cutting process with the adapted laser cutting parameters 5. Steps 112, 114, 116 can also be repeated until the actual workpiece part quality 7 corresponds at least to the predetermined workpiece part target quality 4. If the actual workpiece part quality 7 already corresponds at least to the predefined workpiece part target quality 4 , the laser cutting machine 10 has already adopted its processing configuration with the following laser cutting parameters 5 , which are optimally matched to the material quality and the machine state to produce an actual workpiece part quality 7 that substantially corresponds to the workpiece part target quality 4 .

Claims

1. A method (100) for laser cutting a workpiece component (44) from at least one workpiece (40) by means of a laser beam (1) of a laser cutting machine (10), wherein: The method (100) comprises the following steps (102, 108, 110): - determining at least one material quality parameter (2) of the material quality of the at least one workpiece (40); - determining at least one laser cutting parameter (2) for laser cutting of the workpiece part (44), wherein the at least one laser cutting parameter (5) is determined as a function of the at least one determined material quality parameter (2); and - laser cutting the workpiece component (44) from the at least one workpiece (40) by means of the laser beam (1) of the laser cutting machine (10), wherein the at least one determined laser cutting parameter (5) is used for the laser cutting process.

2. The method (100) according to claim 1, wherein: The method (100) further comprises a step (106) of predefining a target workpiece part quality (4), wherein the determination of the at least one laser cutting parameter (5) is carried out in such a way that the predefinable target workpiece part quality (4) is achieved during the laser cutting process.

3. The method (100) according to claim 1 or 2, wherein: At least one machine state parameter (3) of the machine state of the laser cutting machine (10) is also determined, and the at least one laser cutting parameter (5) is also determined based on the at least one determined machine state parameter (3).

4. The method (100) according to claim 3, wherein: The at least one machine status parameter (3) describes at least one maintenance status and / or operating status of the laser cutting machine (10).

5. The method (100) according to any one of the preceding claims, wherein: The at least one material quality parameter (2) is determined based on manufacturer-side workpiece data and / or based on measurement data resulting from measurements of the at least one workpiece (40) by means of at least one sensor and / or at least one camera device (22).

6. The method (100) according to any one of the preceding claims, wherein: The at least one material quality parameter (2) describes at least one of the following: material composition, material grain size, surface quality and / or material state.

7. The method (100) according to any one of the preceding claims, wherein: The at least one laser cutting parameter (5) specifies at least one of: laser cutting power, laser cutting feed, focus position, focus diameter, nozzle position and / or laser cutting gas pressure.

8. The method (100) according to any one of the preceding claims, wherein: The method (100) further comprises the following additional steps (112, 114, 116): - generating measurement data (6) relating to the workpiece component (44), the at least one workpiece (40) and / or the laser cutting process by means of at least one sensor and / or at least one camera device (22); - analyzing the measurement data (6) to determine the actual workpiece component quality (7) of the workpiece component (44); and - adapting the at least one laser cutting parameter (5) based on the ascertained actual workpiece part quality (7), in particular in comparison with a predefined workpiece part target quality (4).

9. The method (100) according to claim 8, wherein: The steps of generating, analyzing and adapting are repeated, in particular until the actual workpiece component quality (7) corresponds at least to the predefined workpiece component quality (4).

10. The method (100) according to claim 8 or 9, wherein: The at least one sensor and / or the at least one camera device (22) comprises at least one of the following: a slag removal unit for detecting a jet beam during laser cutting, a spark detection unit for detecting spark size and / or spark brightness during laser cutting, a line spectrum sensor for detecting spectral lines during laser cutting, and a hyperspectral camera device for detecting temperature trends during laser cutting.

11. The method (100) according to any one of claims 8 to 10, wherein: The at least one sensor and / or the at least one camera (22) is a multi-detection system having at least two sensors and / or camera devices (22).

12. A laser cutting machine (10) for laser cutting a workpiece component (44) from at least one workpiece (40) by means of a laser beam (1) from a laser cutting head (24) of the laser cutting machine (10), wherein: The laser cutting machine (10) has: - a determination module (51) for determining at least one material quality parameter (2) of the material quality of the at least one workpiece (40); a determination module (54) for determining at least one laser cutting parameter (5) for laser cutting of the workpiece component (44), wherein the at least one laser cutting parameter (5) is determined as a function of the at least one material quality parameter (2) determined; and - a control module (57) for controlling the laser cutting of the workpiece component (44) from the at least one workpiece (40) by means of the laser beam (1) from the laser cutting head (24) using the determined at least one laser cutting parameter (5).

13. The laser cutting machine (10) according to claim 12, wherein: The laser cutting machine (10) also has a further determination module (52) for determining a machine state parameter (3) of a machine state of the laser cutting machine (10), and the determination module (54) is configured to determine the at least one laser cutting parameter (5) also based on the at least one determined machine state parameter (3).

14. The laser cutting machine (10) according to claim 13, wherein: The further ascertainment module (52) is a machine recording module or has a machine recording module, by which the machine state parameter (3) is recorded.

15. The laser cutting machine (10) according to any one of claims 12 to 14, wherein: The laser cutting machine (10) further comprises: at least one sensor and / or at least one camera device (22) for generating measurement data (6) related to the workpiece component (44), the at least one workpiece (40) and / or the laser cutting process; - an analysis module (55) for analyzing the measurement data (6) to determine the actual workpiece component quality (7) of the workpiece component (44); and An adaptation module (56) for adapting the at least one laser cutting parameter (5) based on the ascertained actual workpiece part quality (7), in particular in comparison with a predefined workpiece part target quality (4).

Images