Method for piercing laser beam of laser cutting machine into plate-shaped workpiece in order to cut workpiece part from workpiece along predetermined cutting contour on workpiece

Abstract

The invention relates to a method (100) for penetrating a laser beam (40) of a laser cutting machine (10) into a plate-shaped workpiece (30) in order to cut a workpiece part (32) from the workpiece (30) along a predetermined cutting contour (42) on the workpiece (30), the workpiece (30) resting on a workpiece support (20) having a plurality of support regions (24) and the relative position of the support regions (24) with respect to the workpiece (30) being known, according to the invention, a predetermined surface region (50) on the workpiece (30) is assigned to the bearing region (24) on the basis of the known relative position, and a damage-free piercing point (44, 46) for piercing the laser beam (40) into the workpiece (30) in order to cut the workpiece part (32) is selected, the piercing point being located outside the predetermined surface region (50) such that the laser beam (40) does not penetrate any of the bearing regions (24).

Description

Technical Field

[0001] The invention relates to a method and a laser cutting machine according to the preamble of claim 1 . Background Art

[0002] For example, a method according to the preamble of claim 1 is known from DE 10 2018 126 077 A1, which shows a method for laser cutting, in which the position of a workpiece sheet relative to a support plate of a workpiece support is determined and the position of the support tip of the support plate is calculated. The support space on the support tip and the space around the support are defined, wherein a comparison is made with programmed contours and penetration points. Based on the comparison result, the layout of the workpiece parts to be cut is optimized in the control program for the cutting process, i.e. the position of the contour / workpiece parts to be cut is shifted on the workpiece sheet in order to prevent the cutting contour or the penetration point from being located exactly on the sheet tip and thus causing damage to the sheet tip by the laser beam.

[0003] This known method reliably prevents damage to the workpiece supports. However, the method is complicated because the nesting must be optimized for additional constraints. There are other constraints, such as minimizing the waste of remaining workpieces, and optimization under multiple constraints is therefore challenging. It is difficult to provide a nesting that optimally meets all constraints, for example, completely preventing damage to the support sheet and at the same time enabling minimal waste of remaining workpieces, where these are just two of many possible other constraints. Summary of the invention

[0004] It is therefore an object of the present invention to provide a method which is improved compared to the prior art and which reliably prevents damage during laser cutting of workpiece components from plate-like workpieces in a simple manner and with the fewest possible constraints.

[0005] This object is achieved by a method according to claim 1. Therefore, a method is proposed for penetrating a laser beam of a laser cutting machine into a plate-shaped workpiece to cut a workpiece component from the workpiece along a cutting contour predetermined on the workpiece, wherein the workpiece is placed in a workpiece support having a plurality of support areas, and the relative positions of the support areas with respect to the workpiece are known (or determined). Based on the known relative positions, predefined surface areas on the workpiece are assigned (or are to be assigned) to the support areas. In addition, a non-destructive penetration point is selected for penetrating the laser beam into the workpiece to cut out the workpiece component, the position of which is located outside the predefined surface area, so that the laser beam does not penetrate any of the support areas.

[0006] Thus, the method according to the present invention solves the above-mentioned task in the following manner, the method selects a penetration point for the laser beam to penetrate into the workpiece before cutting the workpiece part itself, the penetration point or its position is not located in the support area of ​​the workpiece support, so that the workpiece support will not be damaged by the penetration. This penetration point is referred to as a non-damaging penetration point in this article. The surface area is here predefined in the following position by the known relative position of the workpiece relative to the support area of ​​the workpiece support (or vice versa), in which damage to the workpiece support will occur during penetration. Since the penetration into the support area requires a lot of energy and time, the method according to the present invention not only prevents damage to the workpiece support, but also saves time and energy. By aligning the relative position of the workpiece relative to the support area with the penetration point, it is achieved that the layout planning (Schachtelungsplan) does not need to be tediously changed according to the position of the workpiece on the support area.

[0007] The method only relates to workpiece parts on a workpiece. However, a large number of workpiece parts are usually cut from a workpiece. The method can accordingly be applied to a plurality of workpiece parts or all workpiece parts of a workpiece, whereby a non-damaging penetration point is selected for each of the workpiece parts.

[0008] The penetration point is the point into which the laser beam penetrates in order to trace the cutting contour and thus the workpiece part in the workpiece. The penetration is therefore part of the cutting process, which however precedes the actual cutting of the workpiece part from the workpiece. The penetration point can be located outside the actual cutting contour. The penetration point can approach the cutting contour of the workpiece part in a predefined path or cutting start point, in particular in an arcuate path or arcuate cutting start point.

[0009] Selecting the puncture point especially means selecting or determining the position of the puncture point on the workpiece. For example, the puncture point can be freely selected in its position or selected from a puncture point that is predetermined and therefore predefined in its position, as will be described in more detail later.

[0010] "Plate-shaped workpiece" is currently understood to be a workpiece plate or workpiece sheet, which has its maximum extension in a horizontal plane and is provided with a thickness in a vertical plane orthogonal thereto. Such a workpiece sheet can be a workpiece plate in particular. Workpiece parts are cut out from such a workpiece sheet (hereinafter also referred to only as "workpiece") by means of laser cutting. It can be provided that the workpiece part also remains connected to the workpiece through one or more set breaking points, and then the workpiece part can be loosened from the set breaking points. This set breaking point can be configured in particular in the form of a splice between the workpiece part and the workpiece or the remaining workpiece.

[0011] The laser cutting machine for laser cutting a workpiece can be in particular a flatbed machine tool, i.e. a laser cutting flatbed machine tool, in particular a two-dimensional laser flatbed machine. The flatbed machine tool can also be a composite machine that can perform other separation processes and / or other processing steps (e.g. deburring, bending, folding, welding, drilling, thread cutting, etc.). By means of the laser cutting machine, workpiece parts are cut out from the workpiece or the remaining workpiece by means of laser cutting, and the workpiece parts are predetermined for the laser cutting machine in terms of their shape. The cutting contour can be predetermined here according to the nesting plan, which can be predetermined, for example, by the control device of the laser cutting machine. Then, the corresponding laser processing head of the laser cutting machine outlines the predetermined cutting contour with a laser beam.

[0012] In the method, the relative position of the support region relative to the workpiece is known. Of course, the method according to the invention can include the previous step of detecting the relative position of the support region relative to the workpiece. In this case, the geometry or arrangement of the support regions relative to one another can be known, since they are usually rigid and do not move. However, the corresponding position of the workpiece on the workpiece support and thus the support region can change. How the detection of the workpiece relative to the workpiece support can be carried out, for example by ascertaining it by means of a sensor, will be explained in more detail later on by way of example.

[0013] The workpiece support can include a pallet or the like, for example. The workpiece support can also have a plurality of support sheets. The support sheets can extend in particular parallel to each other. On the support sheet, the support area can be arranged along the support sheet respectively. The support area can be a support riser in particular, in the form of a support tip in particular. The workpiece can be placed on the support area of ​​the support sheet at a defined distance between the support area of ​​the same support sheet and the support area of ​​different support sheets. The support sheet can be a part of a pallet, can be arranged on a pallet or between the edges of a pallet, and can be firmly connected to a laser cutting machine, in particular its pallet changer. The support area can provide a point-shaped or preferably surface-shaped support area to the workpiece. The support riser, in particular the support tip, in particular the support riser with a surface-shaped support area for the workpiece can be constructed by a sawtooth section on the support sheet, wherein each sawtooth section constructs the support riser. Accordingly, the support area, in particular the support tip of the support sheet, can now be protected from damage and wear. Accordingly, for the pre-definition of the surface area, only the support area, in particular the support tip, can be considered. This improves the quality of the workpiece component, since the undamaged support tip always enables the same accurately positioned support and thus the relative position of the workpiece relative to the workpiece support. It also avoids having to replace the support sheet, so that the method can be implemented cost-effectively.

[0014] Advantageously, two penetration points for the workpiece parts are predefined (or predefined) in the layout planning of the laser cutting machine, and the non-damaging penetration point is selected from the two predefined penetration points by comparing the predefined penetration points with the predefined surface area. The layout planning therefore does not have to take into account the coincidence of the penetration points and the support area. Instead, only two penetration points are defined in the layout planning. The layout planning here gives the so-called layout or distribution of the workpiece parts on the workpiece, and therefore the cutting contour and the penetration points.

[0015] Preferably, the two penetration points are predefined at a predefined penetration point distance from each other on the workpiece plane of the workpiece, wherein the predefined penetration point distance is selected such that at most one of the two penetration points falls into one of the predefined surface areas in the workpiece plane in the known geometry of the support area. This ensures that a respective one of the two penetration points provided for the workpiece part according to the nesting plan can always be used for non-destructive penetration by the laser beam. For this purpose, it is required that the geometry of the support area is known. The geometry refers in particular to the arrangement and / or size of the support area in the workpiece plane.

[0016] For this purpose, the distance between the penetration points in a first extension direction of the workpiece plane, which are spaced apart from one another along the first extension direction, can differ from the distance between the supporting regions in each case between two supporting regions.

[0017] To this end, the support area can also be arranged on a support plate of the workpiece support, wherein the support plates are arranged parallel to each other in a second extension direction of the workpiece plane extending perpendicularly to the first extension direction, and the penetration point distance in the second extension direction is different from the support plate distance between each two support plates.

[0018] Finally, it can also be provided that the puncture point distance in the first extension direction is also greater than the length of the surface area in the first extension direction and / or the puncture point distance in the second extension direction is also greater than the length of the surface area in the second extension direction.

[0019] Preferably, the predefined surface area is larger in area than the support area. This has the advantage that damage to the workpiece support in the area surrounding the support area, in particular at the side of the support tip of the support blade, can be easily prevented.

[0020] It is advantageous if the predefined surface area is circular. This is an advantageous geometry of the surface area, since it is thereby possible to ensure that the peripheral area around the support area is protected from damage to a high degree. A diameter of at least 5 mm, at least 6 mm or at least 7 mm of the circular surface area has proven to be particularly advantageous.

[0021] It is also advantageous if the relative position of the support region relative to the workpiece is predetermined by at least one stop for the workpiece. The stop can be located, for example, on the workpiece support itself and / or on a pallet for the workpiece. A plurality of stops can also be provided. This ensures that the workpiece is always in a defined position relative to the workpiece support. The stop can also be used for an improved sensor determination of the relative position and / or for a double determination of the relative position.

[0022] Alternatively or additionally, the relative position of the support area with respect to the workpiece is determined by measuring the workpiece and / or the workpiece support, in particular at least one reference element on the workpiece support. Since the geometry of the workpiece support, in particular the arrangement of the support areas relative to each other, is known, it may be sufficient to measure the workpiece relative to the reference element of the workpiece support. The measurement may be performed by one or more sensors and / or one or more cameras. The relative position of the workpiece support, in particular the relative position of the support area, may be determined in a simple manner, for example during operation. The measurement may be performed, for example, using a sensor device of a laser cutting machine, in particular a capacitive distance sensor device for detecting the distance between a laser processing head of the laser cutting machine and the workpiece. Typically, at least a subset of the support sheets and / or sheet tips may be detected, and optionally, the positions of the undetected support sheets and / or sheet tips may be calculated by interpolation. Other possible measurement possibilities are based, for example, on optical sensor devices and / or on ultrasonic sensor devices, wherein the optical sensor device is based on at least one of the following methods: an image processing method based on area image recording, a laser light section method, a strip light projection method, a light field camera, a 3D camera such as a time-of-flight (TOF) camera, which is particularly used to detect the distance and / or depth of the sheet depressions, detect the state of the geometric shape for parallel evaluation of the wear of the support sheet and / or the support tip, and the ultrasonic sensor device, in particular, uses an ultrasonic sensor on the cutting head of a flatbed machine tool.

[0023] The object mentioned at the outset is also achieved by a laser cutting machine according to claim 11. The laser cutting machine is equipped with a workpiece support for supporting the workpiece thereon, a laser processing head for emitting a laser beam, and a control device for selecting a penetration point for penetrating the laser beam, wherein the laser cutting machine is configured to carry out the method according to the invention.

[0024] Features described in this text for the method according to the invention also apply for the laser cutting machine, and vice versa.

[0025] The method according to the invention can be controlled in particular by controlling the laser cutting machine accordingly (via a control device). The control device can have a memory on which a computer program is stored, which is executed by the CPU of the control device in order to carry out the method according to the invention on the laser cutting machine. The piercing point is selected or the position of the piercing point on the workpiece is predetermined by the control device or the computer program. Of course, the control device can also perform other tasks, such as measuring relative positions, planning the arrangement of workpiece parts on the workpiece, controlling the cutting of workpiece parts from the workpiece, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Further details and advantageous configurations of the invention can be found in the following description, on the basis of which exemplary embodiments of the invention are described and explained in more detail.

[0027] It schematically shows:

[0028] Figure 1 A perspective view of a laser cutting machine according to an embodiment of the present invention;

[0029] Figure 2 Figure 1 A perspective view of a support sheet of a workpiece support of a laser cutting machine;

[0030] Figure 3 Figure 1 A schematic view of a main housing of a laser cutting machine;

[0031] Figure 4 According to an embodiment of the present invention, Figure 1 A schematic diagram of a method for laser cutting a workpiece component from a plate-shaped workpiece by a laser cutting machine;

[0032] Figure 5 Schematic top view of a workpiece to be machined having a support region and a predefined surface region. DETAILED DESCRIPTION

[0033] In the following description and in the drawings, the same reference numerals are used respectively for identical or corresponding features.

[0034] Figure 1 The laser cutting machine 10 is shown in the form of a laser cutting flatbed machine tool having a main housing 12 in which a laser beam 40 (see Figure 3 ) performs the laser cutting process. In particular, the focus of the laser beam 40 is controlled by the control device 11 (see Figure 3 ) is guided along a predetermined cutting contour 42 arranged in the processing area on a plate-like workpiece 30, in particular a plate extending essentially two-dimensionally, so as to cut out a workpiece part 30 having a predetermined specific shape according to the layout planning.

[0035] The laser cutting machine 10 also includes a pallet changer 14. The pallet changer 14 is configured to accommodate one or more pallets 18 during production. Workpieces 30 to be cut (as raw materials or starting materials), in particular workpiece sheets, can be placed and stored on the pallets 18 and installed in the main housing 12 for the laser cutting process. After the cutting process is completed, the pallet changer 14 can be replaced with a pallet 18. Figure 1 As shown, the pallet 18 along with the cut workpieces 30 may be moved out of the main housing 12 so that the cut workpiece parts 32 may be picked out from the remaining workpieces retained by the workpieces 30 .

[0036] Figure 3 The laser cutting process in the main housing 12 is shown. The laser processing head 13, which emits a laser beam 40 for cutting a workpiece component 32 from the workpiece 30 onto the workpiece 30, can be freely positioned in the processing area so that the laser beam 40 can be guided along essentially any two-dimensional cutting contour on the workpiece 30 to be cut. In this case, a cutting contour 42 for the laser beam 40 is accordingly predetermined according to the layout planning in the control device 11 in order to cut the workpiece component 32 from the workpiece 30. The layout planning specifies the arrangement of the individual workpiece components 32 in the workpiece 30, such as Figure 1 In addition, the layout planning includes the provision of the piercing points 44, 46 and the predetermined cutting starting point 48 for piercing the laser beam 40 and guiding the laser beam along the cutting starting point 48 to the cutting contour 42 (see Figure 5 ).

[0037] During laser cutting, the laser beam 40 heats the metal of the workpiece 30 along a predetermined cutting contour 42 until the metal melts. A gas jet, usually nitrogen or oxygen, usually leaves the laser processing head 13 in the region of the laser beam 40 and presses the molten material of the workpiece 30 downward and out of the formed gap. The workpiece 30 is thus completely severed by the laser beam 40 during cutting.

[0038] To cut out workpiece parts 32, laser beam 40 is moved along a predetermined cutting contour 42 of the respective workpiece 32. This starts at one of penetration points 44, 46 located outside workpiece 30 and then approaches the contour of workpiece 30, in particular at arc-shaped cutting start point 48.

[0039] In the exemplary embodiment shown, the pallet 18 has a workpiece support 20. The workpiece support 20 has a plurality of support webs 22 which extend transversely, in particular perpendicularly, to the feed direction of the workpiece 30 into the main housing 12 and are oriented parallel to one another.

[0040] exist Figure 2, a portion of the support sheet 22 is shown in perspective form. For example, the support sheets 22 have a distance of 20 mm to 100 mm from each other. The support sheet 22 forms a support area 24, on which the workpiece 30 is placed or supported. The support area 24 usually forms grid points, which can have a distance of, for example, 5 mm to 50 mm along the support sheet 22, wherein the support sheet 22 can have a thickness of, for example, 1 mm to 5 mm. Thus, the support area 24 forms a regional grid that can influence the cutting process of the workpiece 30 located thereon. The area of ​​the support sheet 22 that influences the cutting process can also extend to an area that directly connects to the support area 24 that is in contact with the workpiece 30, for example, the side of the support sheet 22 that leads to the support area 24. As shown, the support area 24 here is the tip of the repeated sawtooth section 26 of the support sheet 22.

[0041] Figure 1 Also shown is a camera 16 of the laser cutting system 10, which is arranged, for example, on the main housing 12. The camera 16 can be designed in particular to record images of the pallet 18, the support sheet 22 and the support area 24 and the relative position of the workpiece 30 relative to the pallet 18 (and possibly the support sheet 22 and the support area 24), and is connected to an image evaluation unit of the control device 11. The control device 11 can thus at least determine the relative position of the workpiece 30 relative to the support area 24 or the relative position of the support area 24 relative to the workpiece 30. In this case, due to the geometric structure of the support area 24, the arrangement of the support area is known. It is therefore sufficient to identify the relative position of the workpiece 30 relative to a reference element (not shown), in particular a reference element on the workpiece support 20. The control device 11 can predefine these support areas 24 as follows: Figure 5 , or defines an enlarged surface area 50 around the support area 24, in particular a circular surface area 50, as is also and merely exemplarily shown in Figure 5 The surface area 50 of the support disc 22 is shown in the lower center.

[0042] As reference Figures 1 to 3 As explained, with the aid of the laser cutting system 10, now the Figure 4 1 . As described above, in this case, in a first method step 102, the relative position of the workpiece 30 relative to the support area 24 is determined. In a second method step 104, a surface area 50 is defined based on the support area 24. The surface area 50 includes at least the area where the workpiece 30 rests on the support area 24, and preferably also includes an adjacent area in which the side surface of the support sheet 22 branches off from the support area 24.

[0043] Subsequently, in a third method step 106, one of the two predefined puncture points 44, 46 is selected based on a comparison of the predefined puncture points 44, 46 with the predefined surface area 50. In this case, the puncture point 44, 46 arranged outside the predefined surface area is selected as the non-damaging puncture point 44, 46, and the laser beam 40 is pierced at the position of this non-damaging puncture point. This prevents the support plate 22 from being damaged by the laser beam 40 at its support area 24.

[0044] In a fourth method step 108 of method 100 , a workpiece part 32 is finally cut from the workpiece 30 along a predetermined cutting contour 42 , wherein the laser beam 40 , after penetrating into the non-destructive penetration points 44 , 46 , reaches the cutting contour 42 via the cutting start point 48 and traces the cutting contour in order to cut out the workpiece part 32 .

[0045] Figure 5 A schematic top view of a workpiece 30 with a highly simplified nesting plan is shown, in which only one workpiece part 32 is present or observed for cutting, which workpiece part also has an exemplary simple rectangular geometry. Here, the workpiece 30 and the workpiece support 20 are observed in a common workpiece plane 34, in which the workpiece 30 lies flat on the workpiece support 20, i.e., the two are in direct contact with each other.

[0046] The support region 24, in particular the support tip, of the support blade 22 of the workpiece support 20 lies below the workpiece 30. The surface of the support region 24 is predefined as the surface regions 50 described above. Along the two surface regions 50, a cutting contour 42 for cutting a workpiece part 32 from the workpiece 30 is predefined.

[0047] exist Figure 5 , now two previously mentioned puncture points 44, 46 are shown, which are predefined for puncture according to the pattern planning in the control device 11. Here, the two puncture points 44, 46 are located at a predefined puncture point distance A from each other. In the first extension direction Y in the workpiece plane 34, the puncture point distance A is less than the support area distance B between adjacent support areas 24 in the first extension direction Y. At the same time, the puncture point distance A in the first extension direction Y is greater than the length of the surface area 50 in the first extension direction Y. In addition, the puncture point distance A in the second extension direction X on the workpiece plane 34, which is perpendicular to the first extension direction Y, is less than the support sheet distance C between adjacent support sheets 22 in the second extension direction X. At the same time, the puncture point distance A in the second extension direction X is greater than the length of the surface area 50 in the second extension direction X.

[0048] The above-mentioned selection of the puncture point distance A between each two puncture points 44, 46 in the pattern planning in the first extension direction Y and the second extension direction X ensures that at least one of the two predefined puncture points 44, 46 of the workpiece part 34 is always located outside the predefined surface area 50 and can be selected as a non-destructive puncture point 44, 46.

[0049] For example, in Figure 5 In the embodiment of the present invention, the predefined puncture point 44 is located in the workpiece plane 34 above the support plate 22. What is not visible due to the workpiece 30 is that the puncture point 44 is actually located on the predefined surface area 50 or the support area 24. Therefore, this puncture point 44 cannot be selected without avoiding damage to the support area 24. However, due to the selected puncture point distance A, the predefined puncture point 46 is arranged outside the predefined surface area 50, as shown in FIG. Figure 5 Therefore, the penetration point 46 is a non-destructive penetration point 46 through which the laser beam 40 can penetrate into the workpiece 30, can move along its cutting start point 48 to the cutting contour 42, and can trace the cutting contour 42 in order to cut the workpiece part 32 from the workpiece 30.

Claims

1. A method (100) for causing a laser beam (40) of a laser cutting machine (10) to penetrate into a plate-shaped workpiece (30) in order to cut a workpiece part (32) from the workpiece (30) along a cutting contour (42) predetermined on the workpiece (30), wherein: The workpiece (30) is placed on a workpiece support (20) having a plurality of support areas (24), and the relative position of the support areas (24) relative to the workpiece (30) is known, characterized in that predefined surface areas (50) on the workpiece (30) are assigned to the support areas (24) based on the known relative positions, and non-destructive penetration points (44, 46) are selected for penetrating the laser beam (40) into the workpiece (30) to cut out the workpiece component (32), the position of the penetration point being located outside the predefined surface area (50) so that the laser beam (40) does not penetrate any of the support areas (24).

2. The method (100) according to claim 1, wherein: Two piercing points (44, 46) for the workpiece part (32) are predefined in the layout planning of the laser cutting machine (10), and the non-damaging piercing point (44, 46) is selected from the two predefined piercing points (44, 46) by comparing the predefined piercing points (44, 46) with the predefined surface area (50).

3. The method (100) according to claim 2, wherein: The two puncture points (44, 46) are predetermined to have a predetermined puncture point distance (A) from one another in a workpiece plane (34) of the workpiece (30), wherein the predetermined puncture point distance (A) is selected such that at most one of the two puncture points (44, 46) falls into one of the predetermined surface areas (50) in the workpiece plane (34) in the known geometry of the support area (24).

4. The method (100) according to claim 3, wherein: The penetration point distance (A) in a first extension direction (Y) of the workpiece plane (34) is different from the support area distance (B) between each two support areas (24), the support areas (24) being spaced apart from each other along the first extension direction.

5. The method (100) according to claim 4, wherein: The support area (24) is arranged on a support sheet (22) of the workpiece support (20), wherein the support sheets (22) are arranged parallel to each other in a second extension direction (X) of the workpiece plane (34) extending perpendicularly to the first extension direction (Y), and the penetration point distance (A) in the second extension direction (X) is different from the support sheet distance (C) between every two support sheets (22).

6. The method (100) according to claim 5, wherein: The insertion point distance (A) in the first extension direction (Y) is also greater than the length of the surface area (50) in the first extension direction (Y), and / or the insertion point distance (A) in the second extension direction (X) is also greater than the length of the surface area (50) in the second extension direction (X).

7. The method (100) according to any one of the preceding claims, wherein: The predefined surface area (50) is larger in area than the support area (24).

8. The method (100) according to claim 6, wherein: The predefined surface area (50) is circular.

9. The method (100) according to any one of the preceding claims, wherein: The relative position of the support region (24) with respect to the workpiece (30) is predetermined by at least one stop element for the workpiece (30).

10. The method (100) according to any one of the preceding claims, wherein: The relative position of the support region (24) relative to the workpiece (30) is determined by measuring the workpiece (30) and / or the workpiece support (20), in particular at least one reference element on the workpiece support (20).

11. A laser cutting machine (10) comprising a workpiece support (20) for supporting a workpiece (30) thereon, a laser processing head (13) for emitting a laser beam (40), and a control device (11) for selecting a penetration point (44, 46) for penetrating the laser beam (40), wherein: The laser cutting machine (10) is configured to perform the method (100) according to any one of the preceding claims.

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