Laser cutting machine and control method

Abstract

The invention discloses a laser cutting machine and a control method. The laser cutting machine comprises a cutting device, the cutting device comprises a cutting head and an adjusting part used for adjusting the height of the cutting head in the vertical direction, and the adjusting part comprises a driving assembly for driving the cutting head to move in the vertical direction and a limiting piece for limiting the moving stroke of the driving assembly and the cutting head; and the moving distance of the cutting head is limited by the limiting piece with the same thickness as the to-be-processed plate. According to the scheme, the limiting piece is arranged to be matched with the driving assembly to replace a conventional height adjuster to limit up-down movement of the cutting head, the limiting piece with the same thickness as the plate is selected to be assembled to the adjusting part, the cutting head descends to the position tmm away from the working platform before cutting, the cutting head descends to the position of the to-be-machined plate, and therefore the cutting efficiency is improved. The height of the cutting head is controlled through the limiting piece, the adverse effect on z-axis positioning calibration signals caused by a height adjuster is avoided, the machining stability of equipment is enhanced, and the production efficiency of the laser gas cutting machine is improved.

Description

Technical Field

[0001] The present application belongs to the field of laser cutting technology, and specifically relates to a laser cutting machine and a control method. Background Art

[0002] When the laser cutting machine is in use, the cutting head will move according to the set cutting trajectory. However, in the case of different materials, different thicknesses, and different cutting methods, the height of the laser cutting head needs to be adjusted and controlled. The distance between the cutting nozzle and the surface of the workpiece is one of the main factors that determine the incision quality and cutting speed.

[0003] However, due to the high speed of the laser cutting machine, manual adjustment is obviously not feasible. Therefore, the existing technology usually uses a cutting head height adjuster to dynamically adjust the height of the laser cutting head. The z-axis CNC axis is responsible for controlling the movement of the cutting head in the vertical direction, that is, the up and down movement of the cutting head (usually called z-axis movement), and the height adjuster is responsible for real-time monitoring and adjusting the distance between the cutting head and the workpiece. The height adjuster in the existing technology is close to the z-axis CNC axis and is easily disturbed by cutting, resulting in poor z-axis positioning and calibration signals. At the same time, due to the complex structure of the z-axis, it is prone to cutting jitter and poor cutting accuracy. These problems are usually solved by lowering the servo parameters and reducing the dynamic performance, resulting in reduced production efficiency of the laser cutting machine. Summary of the invention

[0004] The present application provides a laser cutting machine and a control method, which avoids the influence of the height adjuster on the z-axis positioning of the cutting head in the prior art and improves the production efficiency of the laser cutting machine.

[0005] The technical solution adopted in this application is:

[0006] A laser cutting machine and a control method, the laser cutting machine comprising:

[0007] A work platform for placing the plate to be processed, a moving device arranged on the work platform and a cutting device connected to the moving device, the moving device drives the cutting device to move along the work platform to achieve cutting of the plate to be processed, the cutting device comprises a cutting head and an adjusting part for adjusting the height of the cutting head in the vertical direction, the adjusting part comprises a driving component for driving the cutting head to move vertically and a limiting member for limiting the driving component and the moving stroke of the cutting head;

[0008] The control method is applied to the vertical movement of the cutting head, and the control method includes:

[0009] S1: Start the machine, and the driving assembly drives the cutting head to move vertically to the L1 position, so that the cutting head is vertically away from the working platform; wherein the L1 position is the highest position of the cutting head in the vertical direction;

[0010] S2: Place the plate to be processed on the working platform, and assume that the thickness of the plate to be processed is tmm;

[0011] S3: Select a limiter with a thickness of tmm and assemble it to the adjustment part, so that when the driving assembly drives the cutting head to move down to the L2 position, the distance between the cutting head and the working platform is tmm, wherein the L2 position is the lowest position of the cutting head in the z-axis direction;

[0012] S4: According to the material and thickness of the plate to be processed, query the system parameters and move the cutting head to the corresponding focal length according to the corresponding parameters;

[0013] S5: The moving device drives the cutting device to move along the working platform to the cutting position; and at the cutting position, the driving assembly drives the cutting head to move down to the L2 position;

[0014] S6: The fiber laser is started and the cutting process is carried out according to the computer program graphics at the cutting position;

[0015] S7: The graphic cutting of the cutting position is completed.

[0016] Preferably, the driving assembly includes a multi-stage cylinder, and S5 further includes: the cutting head moves downward to the L2 position, the air inlet of the multi-stage cylinder is connected to the atmosphere, and the multi-stage cylinder is depressurized.

[0017] Preferably, the cutting device includes a supporting frame, the driving assembly is provided with a slide plate for fixing the cutting head, the slide plate is connected to the telescopic shaft of the multi-stage cylinder, the supporting frame is provided with a sliding rod connected to the slide plate, the sliding rod is arranged parallel to the telescopic shaft, the supporting frame is provided with a telescopic opening for allowing the telescopic shaft to pass through, and the multi-stage cylinder drives the slide plate connected to it to move along the sliding rod so that the cutting head located on the slide plate moves vertically along the supporting frame.

[0018] Preferably, the driving assembly also includes a connecting plate abutting the limit plate, the connecting plate is located above the supporting frame, and the connecting plate includes a first assembly hole for fixing the telescopic shaft and a second assembly hole for allowing the sliding rod to pass through, the telescopic shaft drives the connecting plate to move downward to abut against the limit plate so that the cutting head reaches the L2 position.

[0019] Preferably, the adjustment part also includes a positioning assembly for assembling a limit plate, the positioning assembly includes a positioning rod located between the connecting plate and the supporting frame, the connecting plate is provided with a third assembly hole for the positioning rod to pass through, the third assembly hole is located between the first assembly hole and the second assembly hole, the connecting plate moves downward to allow the positioning rod to pass through the third assembly hole to abut against the limit plate located on the positioning rod.

[0020] Preferably, the positioning assembly also includes a placement rod arranged on one side of the connecting plate, the placement rod is used to accommodate an idle limit plate, and the limit plate is provided with a limit opening that allows it to be sleeved on the positioning rod and the placement rod, so that the limit plate can achieve position interaction between the positioning rod and the placement rod.

[0021] Preferably, the positioning rod includes a first positioning section fixed to the top of the supporting frame and a second positioning section extending upwardly along the first positioning section for assembling the limiting plate, and the first positioning section is fixed to the supporting frame by a fastener.

[0022] Preferably, the support frame further comprises a limiting rod parallel to the slide rod, the slide rod and the limiting rod are provided with slide rails, and a slider adapted to the slide rails is fixedly provided on the back of the slide plate so that the slide plate moves along the slide rod and the limiting rod.

[0023] Preferably, a plurality of limiting plates are provided, and / or the limiting plates have a plurality of thicknesses.

[0024] Preferably, the plate to be processed is provided with a plurality of cutting positions. When switching between the cutting positions, the driving assembly drives the cutting head to move to the L3 position, and steps S5-S7 are repeated until the entire plate to be cut completes the graphic cutting of all the cutting positions;

[0025] Among them, the L3 position is located between the L1 position and the L2 position.

[0026] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0027] (1) The present application scheme limits the up and down movement of the cutting head by setting a limiter in conjunction with a driving assembly instead of a conventional height adjuster. A limiter with the same thickness as the plate is selected and assembled to the adjustment part. Before cutting, the cutting head is lowered to a distance of tmm from the working platform. The cutting head is lowered to the plate to be processed, and the height of the cutting head is controlled by the limiter. This avoids the adverse effects of the height adjuster on the z-axis positioning calibration signal, enhances the processing stability of the equipment, and improves the production efficiency of the laser gas cutting machine.

[0028] (2) By setting a slide to connect the multi-stage cylinder, the multi-stage cylinder is extended and retracted to drive the slide and the cutting head fixed to the slide to move vertically. The fixing method of the cutting head on the slide can be realized with the help of existing technology. When the machine is turned on, the multi-stage cylinder is extended to the maximum length to drive the cutting head to move upward to the highest point to avoid interference or damage to the cutting head caused by other components.

[0029] (3) A multi-stage cylinder is set up and when the cutting head descends to the L2 position, that is, the cutting position, the multi-stage cylinder is depressurized so that it cannot continue to act on the cutting head during the cutting process. Therefore, during the cutting process, if the thickness of a certain cutting position of the plate to be processed is greater than tmm, the cutting head will not be forced to position by the multi-stage cylinder, and it can float adaptively following the slight deformation of the plate. When the surface of the plate to be processed is uneven, the cutting head can be lifted up to protect the cutting head from damage.

[0030] (4) The relative distance between the telescopic shaft and the slide bar is stabilized by positioning the telescopic shaft through the first assembly hole of the connecting plate and limiting the slide bar in the radial direction through the second assembly hole, thereby ensuring that the sliding plate connected to the telescopic shaft and the slide bar can drive the cutting head to move stably without the phenomenon of movement jamming or force change causing the cutting head to move out of position. The third assembly hole is located between the first assembly hole and the second assembly hole, that is, the positioning rod is located between the telescopic shaft and the slide bar, and the connecting plate is also limited by the telescopic shaft and the slide bar. When the connecting plate moves, it is double limited by the telescopic shaft and the slide bar, which is conducive to ensuring that the connecting plate will not be offset during the movement, so that it can accurately move and cooperate with the positioning rod, so that the top of the positioning rod passes through the third assembly hole, and then the connecting plate is abutted against the limiting plate located on the positioning rod, so as to drive the cutting head into position. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0032] Figure 1 This is a schematic diagram of the structure of a laser cutting machine in one embodiment of the present invention;

[0033] Figure 2 It is a schematic structural diagram of a cutting device in one embodiment of the present invention;

[0034] Figure 3 It is a structural schematic diagram of a working platform in one embodiment of the present invention;

[0035] Figure 4 FIG. 4 is a schematic diagram of the structure of a mobile device in an embodiment of the present invention.

[0036] Description of reference numerals:

[0037] 100-working platform, 110-ruler, 120-y-axis guide rail, 130-y-axis rack;

[0038] 200-moving device, 210-crossbeam, 211-motor, 212-gear, 213-x-axis guide rail, 214-x-axis rack;

[0039] 300-cutting device, 310-support frame, 311-slide rod, 312-limit rod, 313-slide rail, 314-slider, 315-slide plate, 320-cutting head, 330-multi-stage cylinder, 331-telescopic shaft, 340-connecting plate, 341-first assembly hole, 342 second assembly hole, 343-third assembly hole, 350-positioning rod, 351-first positioning section, 352-second positioning section, 360-placing rod, 370-limiting block, 380-servo motor, 390-transmission wheel. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features in each embodiment may be combined with each other without conflict.

[0042] In addition, in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0045] The present application provides a laser cutting machine and a control method, such as Figures 1 to 4 As shown, the laser cutting machine includes:

[0046] A work platform 100 for placing a plate to be processed, a mobile device 200 arranged on the work platform 100, and a cutting device 300 connected to the mobile device 200, wherein the mobile device 200 drives the cutting device 300 to move along the work platform 100 to achieve cutting of the plate to be processed, and the cutting device 300 comprises a cutting head 320 and an adjusting part for adjusting the height of the cutting head 320 in the vertical direction, wherein the adjusting part comprises a driving component for driving the cutting head 320 to move vertically and a limiting member for limiting the driving component and the moving stroke of the cutting head 320;

[0047] The control method is applied to the vertical movement of the cutting head, and the control method includes:

[0048] S1: Start the machine, and the driving assembly drives the cutting head 320 to move vertically to the L1 position, so that the cutting head 320 is vertically away from the working platform 100; wherein the L1 position is the highest position of the cutting head 320 in the vertical direction;

[0049] S2: placing the plate to be processed on the working platform 100, assuming that the thickness of the plate to be processed is tmm;

[0050] S3: Select a limiter with a thickness of tmm and assemble it to the adjustment part, so that when the driving assembly drives the cutting head 320 to move down to the L2 position, the distance between the cutting head 320 and the working platform 100 is tmm, wherein the L2 position is the lowest position of the cutting head 320 in the z-axis direction;

[0051] S4: querying system parameters according to the material and thickness of the plate to be processed, and moving the cutting head 320 to the corresponding focal length according to the corresponding parameters;

[0052] S5: The moving device drives the cutting device 300 to move along the working platform 100 to the cutting position; and at the cutting position, the driving assembly drives the cutting head 320 to move down to the L2 position;

[0053] S6: The fiber laser is started and the cutting process is carried out according to the computer program graphics at the cutting position;

[0054] S7: The graphic cutting of the cutting position is completed.

[0055] The present application scheme limits the up and down movement of the cutting head 320 by setting a limiter in conjunction with a driving assembly instead of a conventional height adjuster, selects a limiter with the same thickness as the plate to be assembled to the adjustment part, and before cutting, the cutting head 320 is lowered to a distance of tmm from the working platform 100, and the cutting head 320 is lowered to the plate to be processed. The limiter is used to control the height of the cutting head 320, avoiding the adverse effects of the height adjuster on the z-axis positioning calibration signal, enhancing the processing stability of the equipment, and improving the production efficiency of the laser gas cutting machine.

[0056] It can be understood that the distance between the cutting head 320 and the working platform 100 when the driving assembly drives the cutting head 320 to move downward to the L2 position refers to the distance between the working platform 100 and the position where the plate to be processed is installed.

[0057] As a preferred embodiment, Figure 2 As shown, the driving assembly includes a multi-stage cylinder 330, and S5 also includes: the cutting head 320 moves down to the L2 position, the air inlet of the multi-stage cylinder 330 is connected to the atmosphere, and the multi-stage cylinder 330 is depressurized.

[0058] A multi-stage cylinder 330 is set and when the cutting head 320 descends to the L2 position, that is, the cutting position, the multi-stage cylinder 330 is depressurized so that it cannot continue to act on the cutting head 320 during the cutting process. Therefore, during the cutting process, if the thickness of a certain cutting position of the plate to be processed is greater than tmm, the cutting head 320 will not be forced to be positioned by the multi-stage cylinder 330, and it can adaptively float following the slight deformation of the plate. When the surface of the plate to be processed is uneven, the cutting head 320 can be lifted up to protect the cutting head 320 from damage.

[0059] It should be noted that the multi-stage cylinder 330 adopts a center-sealed electromagnetic valve, which ensures that the piston of the multi-stage cylinder 330 is not retracted regardless of power failure or gas failure, thereby achieving safe locking of the position of the cutting head 320.

[0060] Furthermore, the cutting device 300 includes a supporting frame 310, and the driving assembly is provided with a slide plate 315 for fixing the cutting head 320, the slide plate 315 is connected to the telescopic shaft 331 of the multi-stage cylinder 330, the supporting frame 310 is provided with a sliding rod 311 connected to the slide plate 315, the sliding rod 311 is arranged parallel to the telescopic shaft 331, and the supporting frame 310 is provided with a telescopic opening for allowing the telescopic shaft 331 to pass through, and the multi-stage cylinder 330 drives the slide plate 315 connected thereto to move along the sliding rod 311, so that the cutting head 320 located on the slide plate 315 moves vertically along the supporting frame 310.

[0061] In addition, the support frame 310 also includes a limiting rod 312 parallel to the sliding rod 311. The sliding rod 311 and the limiting rod 312 are provided with a sliding rail 313. A sliding block 314 adapted to the sliding rail 313 is fixed on the back of the sliding plate 315 so that the sliding plate 315 can move along the sliding rod 311 and the limiting rod 312.

[0062] By setting the slide plate 315 to connect the multi-stage cylinder 330, the multi-stage cylinder 330 is extended to drive the slide plate 315 and the cutting head 320 fixed to the slide plate 315 to move vertically, and the cutting head 320 can be fixed to the slide plate 315 by means of existing technology. When the machine is turned on, the multi-stage cylinder 330 is extended to the maximum length, driving the cutting head 320 to move upward to the highest point to avoid interference or damage to the cutting head 320 by other components.

[0063] In a preferred embodiment, Figure 2 As shown, the driving assembly also includes a connecting plate 340 abutting against the limit plate, the connecting plate 340 is located above the supporting frame 310, and the connecting plate 340 includes a first assembly hole 341 for fixing the telescopic shaft 331 and a second assembly hole 342 for allowing the slide rod 311 to pass through, the telescopic shaft 331 drives the connecting plate 340 to move downward to abut against the limit plate, so that the cutting head 320 reaches the L2 position.

[0064] The first assembly hole 341 of the connecting plate 340 is used to position the telescopic shaft 331, and the second assembly hole 342 is used to limit the radial direction of the slide bar 311 to ensure that the relative distance between the telescopic shaft 331 and the slide bar 311 is stable, thereby ensuring that the slide plate 315 connected to the telescopic shaft 331 and the slide bar 311 can drive the cutting head 320 to move stably without movement jamming or force changes causing the cutting head 320 to move out of position.

[0065] In one embodiment, the adjustment part also includes a positioning assembly for assembling a limit plate, the positioning assembly includes a positioning rod 350 located between the connecting plate 340 and the support frame 310, the connecting plate 340 is provided with a third assembly hole 343 for the positioning rod 350 to pass through, the third assembly hole 343 is located between the first assembly hole 341 and the second assembly hole 342, the connecting plate 340 moves downward to allow the positioning rod 350 to pass through the third assembly hole 343 to abut against the limit plate located on the positioning rod 350.

[0066] The third assembly hole 343 is located between the first assembly hole 341 and the second assembly hole 342, that is, the positioning rod 350 is located between the telescopic shaft 331 and the sliding rod 311, and the connecting plate 340 is also limited by the telescopic shaft 331 and the sliding rod 311. When moving, the connecting plate 340 is doubly limited by the telescopic shaft 331 and the sliding rod 311, which is beneficial to ensure that the connecting plate 340 will not deviate during the movement, so that it can accurately move and cooperate with the positioning rod 350, so that the top end of the positioning rod 350 passes through the third assembly hole 343, thereby realizing the abutment between the connecting plate 340 and the limiting plate located on the positioning rod 350, and realizing the driving of the cutting head 320 into place.

[0067] Preferably, the positioning assembly also includes a placement rod 360 arranged on one side of the connecting plate 340, and the placement rod 360 is used to accommodate an idle limiting plate. The limiting plate is provided with a limiting opening that allows it to be sleeved on the positioning rod 350 and the placement rod 360, so that the limiting plate can achieve position interaction between the positioning rod 350 and the placement rod 360.

[0068] The limiting plate is annular in shape by setting the limiting opening, and can be directly sleeved on the positioning rod 350 when in use. The limiting plate can be stacked and placed on the placement rod 360 when idle, and can be easily and quickly removed when used again, and can avoid being lost due to being placed casually.

[0069] In one embodiment, a plurality of limiting plates are provided, and / or the thickness of the limiting plates are provided in a plurality of ways.

[0070] Preferably, there are multiple limit plates, and the unused limit plates can be placed on the placement rod 360 so that the limit plates can be collected and replaced. At the same time, multiple limit plates are set with multiple thicknesses to facilitate the processing requirements of plates of different thicknesses. Multiple limit plates can be selected according to actual conditions to obtain a combination of thicknesses corresponding to the plate to be processed.

[0071] In a preferred embodiment, Figure 2 As shown, the positioning rod 350 includes a first positioning section 351 fixed to the top of the support frame 310 and a second positioning section 352 extending upward along the first positioning section 351 for assembling the limiting plate. The first positioning section 351 is fixed to the support frame 310 by fasteners.

[0072] Specifically, the diameter of the first positioning section 351 is greater than the diameter of the second positioning section 352, and the limiting opening of the limiting plate is adapted to the second positioning section 352. It is understandable that the third assembly hole 343 of the connecting plate 340 is also adapted to the diameter of the second positioning section 352, so that the second positioning section 352 can pass through but the limiting plate cannot. Since the thickness of the limiting plate is usually an integer, such as 1mm, 2mm, 5mm, 10mm, etc., if there is a slight difference with the thickness of the plate to be processed but it is not convenient to adjust it by the thickness of the limiting plate, the first positioning section 351 can be adjusted by adjusting the height exposed from the support frame 310 to make an adaptation setting, so as to further improve the limiting accuracy.

[0073] In a preferred embodiment, the plate to be processed is provided with a plurality of cutting positions. When switching between the cutting positions, the driving assembly drives the cutting head 320 to move to the L3 position, and repeats steps S5-S7 until the entire plate to be cut completes the graphic cutting of all cutting positions; wherein the L3 position is located between the L1 position and the L2 position.

[0074] When the cutting head 320 switches between different cutting positions, the cutting head 320 is first lifted a certain distance relative to the plate. Specifically, when the cutting is completed at the next cutting position, the solenoid valve is energized, and the multi-stage cylinder 330 extends and drives the cutting head 320 to move to the L3 position to avoid damage to the plate or damage to the cutting head 320 during the process of changing the cutting position, and to facilitate the cutting head 320 to move quickly to the next cutting position.

[0075] It can be understood that the L3 position can be selected at a suitable position between L1 and L2 according to actual conditions, and as a multi-stage cylinder 330, multiple positions can be set between L1 and L2, and the position corresponding to the height to be lifted can be selected for movement according to actual processing requirements.

[0076] In addition, if Figure 3 As shown, the two adjacent side walls of the working platform 100 in the present application are respectively provided with a ruler 110 for limiting the position of the plate to be processed. When the plate to be processed is placed on the working platform 100, its two sides are against the ruler 110 on the corresponding side to limit the position of the plate to be processed on the working platform 100.

[0077] The work platform 100 is provided with a y-axis guide rail 120 and a y-axis rack 130 in the forward and backward movement direction of the laser head (usually regarded as the y-axis movement direction). The moving device 200 includes a beam 210 that moves along the guide rail. The two ends of the beam 210 respectively use a motor 211 and a gear 212 that cooperate with the y-axis rack 130 on the corresponding side, so that the beam 210 moves along the guide rail to drive the cutting device 300 to move in the y-axis direction. At the same time, Figure 4 As shown, the x-axis guide rail 120 is installed on the upper side and the front side of the beam 210 respectively, and the x-axis rack 130 is installed on the upper side, the cutting device 300 is provided with a servo motor 380 and a transmission wheel 390 cooperating with the x-axis rack 130 on the upper side, and the slide plate 315 is provided with a slider 314 cooperating with the front x-axis guide rail 120 to realize the movement of the cutting device 300 along the beam 210 in the x-axis direction.

[0078] The above method further includes:

[0079] After the plate processing is completed, the multi-stage cylinder 330 drives the cutting head 320 to move to the L1 position;

[0080] The x-axis servo motor 380 and the y-axis servo motor 380 are started, and the x-axis and y-axis encoders are started at the same time. The x-axis servo motor 380 and the y-axis servo motor 380 drive the cutting head 320 to move to the first cutting position of the next plate to be cut according to the encoder feedback value.

[0081] The above steps are repeated to process the next metal sheet.

[0082] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0083] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0084] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A laser cutting machine and a control method, characterized in that: The laser cutting machine comprises: A work platform for placing a plate to be processed, a moving device arranged on the work platform, and a cutting device connected to the moving device, wherein the moving device drives the cutting device to move along the work platform to achieve cutting of the plate to be processed, wherein the cutting device comprises a cutting head and an adjusting part for adjusting the height of the cutting head in a vertical direction, wherein the adjusting part comprises a driving component for driving the cutting head to move vertically and a limiting member for limiting the moving stroke of the driving component and the cutting head; The control method is applied to the vertical movement of the cutting head, and includes: S1: Start the machine, the driving assembly drives the cutting head to move vertically to the L1 position, so that the cutting head is vertically away from the working platform; wherein the L1 position is the highest position of the cutting head in the vertical direction; S2: placing the plate to be processed on the working platform, assuming that the thickness of the plate to be processed is tmm; S3: Select the limiter with a thickness of tmm and assemble it to the adjustment part, so that when the driving assembly drives the cutting head to move down to the L2 position, the distance between the cutting head and the working platform is tmm, wherein the L2 position is the lowest position of the cutting head in the z-axis direction; S4: According to the material and thickness of the plate to be processed, query the system parameters and move the cutting head to the corresponding focal length according to the corresponding parameters; S5: the moving device drives the cutting device to move along the working platform to the cutting position; and at the cutting position, the driving assembly drives the cutting head to move down to the L2 position; S6: The fiber laser is started and the cutting process is carried out according to the computer program graphics at the cutting position; S7: The graphic cutting of the cutting position is completed.

2. The laser cutting machine and control method according to claim 1, characterized in that: The driving assembly includes a multi-stage cylinder, and S5 further includes: the cutting head moves downward to the L2 position, the air inlet of the multi-stage cylinder is connected to the atmosphere, and the multi-stage cylinder is depressurized.

3. The laser cutting machine and control method according to claim 2, characterized in that: The cutting device includes a supporting frame, the driving assembly is provided with a slide plate for fixing the cutting head, the slide plate is connected to the telescopic shaft of the multi-stage cylinder, the supporting frame is provided with a sliding rod connected to the slide plate, the sliding rod is arranged parallel to the telescopic shaft, the supporting frame is provided with a telescopic opening for the telescopic shaft to pass through, the multi-stage cylinder drives the slide plate connected thereto to move along the sliding rod, so that the cutting head located on the slide plate moves vertically along the supporting frame.

4. The laser cutting machine and control method according to claim 3, characterized in that: The driving assembly also includes a connecting plate abutting against the limit plate, the connecting plate is located above the supporting frame, and the connecting plate includes a first assembly hole for fixing the telescopic shaft and a second assembly hole for allowing the sliding rod to pass through, the telescopic shaft drives the connecting plate to move downward to abut against the limit plate, so that the cutting head reaches the L2 position.

5. The laser cutting machine and control method according to claim 4, characterized in that: The adjustment part also includes a positioning assembly for assembling the limit plate, the positioning assembly includes a positioning rod located between the connecting plate and the supporting frame, the connecting plate is provided with a third assembly hole for the positioning rod to pass through, the third assembly hole is located between the first assembly hole and the second assembly hole, the connecting plate moves down to allow the positioning rod to pass through the third assembly hole to abut against the limit plate located on the positioning rod.

6. The laser cutting machine and control method according to claim 5, characterized in that: The positioning assembly also includes a placement rod arranged on one side of the connecting plate, the placement rod is used to accommodate the idle limit plate, and the limit plate is provided with a limit opening that allows it to be sleeved on the positioning rod and the placement rod, so that the limit plate can achieve position interaction between the positioning rod and the placement rod.

7. The laser cutting machine and control method according to claim 5, characterized in that: The positioning rod includes a first positioning section fixed to the top of the support frame and a second positioning section extending upwardly along the first positioning section for assembling the limit plate. The first positioning section is fixed to the support frame by a fastener.

8. The laser cutting machine and control method according to claim 3, characterized in that: The support frame also includes a limiting rod parallel to the sliding rod, the sliding rod and the limiting rod are provided with a sliding rail, and a sliding block adapted to the sliding rail is fixedly provided on the back of the sliding plate so that the sliding plate moves along the sliding rod and the limiting rod.

9. The laser cutting machine and control method according to claim 1, characterized in that: There are multiple limit plates, and / or the limit plates have multiple thicknesses.

10. The laser cutting machine and control method according to claim 1, characterized in that: The plate to be processed is provided with a plurality of cutting positions. When switching between the cutting positions, the driving assembly drives the cutting head to move to the L3 position, and steps S5-S7 are repeated until the entire plate to be processed completes the graphic cutting of all the cutting positions; Wherein, the L3 position is located between the L1 position and the L2 position.

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