A laser cutting method and cutting device for metal woven mesh tubes

Abstract

The application discloses a metal woven mesh tube laser cutting method and a cutting device, and belongs to the technical field of laser cutting processing. The intersection points of the woven mesh tube are determined by using a visual positioning mode, and the laser cutting position is set according to the positions of the intersection points, so that the intersection points of the woven mesh tube can be avoided, the metal woven mesh tube is cut according to the structure of the metal woven mesh tube, the processing efficiency is effectively improved, the problem of scattered silk at the cutting edge caused by poor cutting of the metal woven mesh tube is solved, and the cutting yield and the processing efficiency are high.

Description

Technical Field

[0001] This invention relates to the field of laser cutting technology, specifically to a laser cutting method and cutting device for metal braided mesh tubes. Background Technology

[0002] Metal braided sleeving is produced as a single long strip. During use, it needs to be cut to the required length. However, manual cutting can result in loose threads at the edges, affecting subsequent normal use.

[0003] Traditionally, the ends of the braided mesh tube are secured with tape or sleeves before manual or machine cutting. While this method effectively addresses edge cutting defects, it has significant drawbacks: it's time-consuming and labor-intensive, and the use of tape or sleeves increases processing costs. Although some specialized cutting equipment automates sleeve fixing, improving efficiency to some extent, the required materials still result in higher cutting costs. Furthermore, the flexibility of the metal mesh tube means that even when secured to the sleeve, slight deviations in the position of each intersection point can occur, making accurate control of the cutting position and leading to problems like loose threads. Summary of the Invention

[0004] Technical objective: To address the shortcomings of existing metal braided mesh tube cutting methods, this invention discloses a laser cutting method and device for metal braided mesh tubes that can locate intersections and ensure accurate cutting positions.

[0005] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution: A method for laser cutting metal braided mesh tubes, comprising the following steps: S01. Secure the metal braided mesh tube; S02. Use a camera to scan along the circumference of the metal braided mesh tube to acquire images of the surface of the metal braided mesh tube. S03. Confirm the location of the intersection of the metal braided mesh tube based on the scanned image from the camera; S04. Perform laser cutting based on the confirmed intersection position, so that the laser cutting position is offset from the intersection.

[0006] Preferably, in step S01 of the present invention, the metal braided mesh tube is fixed by a sleeve, the metal braided mesh tube is sleeved on the sleeve, and the metal braided mesh tube is rotated by the sleeve.

[0007] Preferably, in step S02 of the present invention, the camera includes a first camera and a second camera. The first camera is used to coarsely locate the intersection points in the circumferential direction within the cutting area to confirm the target intersection points. The second camera is set along the direction directly facing the surface of the metal braided mesh tube. After confirming the target intersection points, the target intersection points are moved to the position of the center point of the second camera's view. The position of the target intersection points is accurately located by the center point of the second camera's view. Then, the positioning of all target intersection points in the circumferential direction of the metal braided mesh tube is carried out step by step in the same manner.

[0008] Preferably, the process of confirming target intersections through the first camera image of the present invention includes: during the initial scan, taking the intersection in the central region of the first camera image as the first target intersection, and when identifying the next target intersection, removing intersections that are connected to the first target intersection to obtain a new set of intersections, determining the spatial distance of each intersection in the new set of intersections in the first camera image relative to the first target intersection, and taking the intersection with the smallest spatial distance as the next target intersection. The determination of the next target intersection is based on its positional relationship with the confirmed adjacent intersections, and the coarse positioning of each target intersection is completed in sequence.

[0009] Preferably, the process of accurately locating the target intersection point by means of the center point of the second camera view includes: after the first camera confirms the target intersection point and performs coarse positioning, the distance from the target intersection point to the center point of the second camera view is calculated, and then, according to the calculation result, the metal braided mesh tube is moved as a whole to bring the target intersection point closer to the center area of ​​the second camera view, and then the movement continues until the target intersection point coincides with the center of the second camera view.

[0010] Preferably, in step S04 of the present invention, the corresponding laser cutting position is determined according to the center position of the view of the second camera, and the corresponding target intersection point is moved to the center position of the view of the second camera to cut with laser.

[0011] Preferably, in step S04 of the present invention, the laser cutting position and the intersection position are offset by 1-1.5mm.

[0012] This invention provides a metal braided mesh tube cutting device for implementing the above-mentioned cutting method. It includes a sleeve for positioning and fixing the metal braided mesh tube, a rotary chuck for clamping the sleeve and rotating the sleeve and the metal braided mesh tube, the rotary chuck being mounted on a rotating mounting base of a machine tool, a motion platform for moving the rotating mounting base as a whole in a plane being provided below the rotating mounting base, a camera for identifying and positioning the intersection points on the surface of the metal braided mesh tube being provided on one side of the sleeve, and a laser cutting head for cutting the metal braided mesh tube.

[0013] Preferably, the camera of the present invention includes a first camera and a second camera. The second camera is disposed on one side of the sleeve along an axis perpendicular to the sleeve. The first camera identifies the target intersection point for laser cutting and performs coarse positioning, while the second camera performs fine positioning of the target intersection point.

[0014] Preferably, the diameter of the sleeve of the present invention is 0.75D≤d≤0.85D, where D is the diameter of the metal braided mesh tube.

[0015] Beneficial effects: The laser cutting method and cutting device for metal braided mesh tubes provided by the present invention have the following beneficial effects: 1. This invention uses laser to cut metal braided mesh tubes, which solves the problems of high cutting efficiency and high cutting cost compared with manual or mechanical cutting methods.

[0016] 2. This invention uses a camera to locate the intersections of the braided mesh tube, which can avoid the intersections during cutting and solve the problem of fraying caused by cutting.

[0017] 3. This invention uses a first camera for coarse positioning of the target intersection point and a second camera for precise positioning of the target intersection point, which can ensure the accuracy of laser cutting and effectively avoid omissions in the cutting process.

[0018] 4. The position of the second camera in this invention remains unchanged. Each time the target intersection is located, the metal braided mesh tube is moved by the motion platform so that the target intersection corresponds to the center of the second camera view. When laser cutting is performed, the position of the laser cutting head is located by the second camera. During cutting, the axial position of the laser cutting head is kept still. It is only necessary to move the metal braided mesh tube by the motion platform, which reduces the difficulty of operation and facilitates the assembly of the device. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0020] Figure 1 This is a schematic diagram of the metal braided mesh tube structure of the present invention; Figure 2 This is a structural diagram of the processing device of the present invention; Among them, 1-metal diamond braided mesh tube, 2-sleeve, 3-rotary chuck, 4-rotary mounting base, 5-motion platform, 6-first camera, 7-second camera. Implementation

[0021] The present invention will now be described more clearly and completely by way of a preferred embodiment in conjunction with the accompanying drawings, but this does not limit the invention to the scope of the described embodiment.

[0022] This invention discloses a laser cutting method for metal braided mesh tubes, comprising the following steps: S01. Secure the metal braided mesh tube; In this invention, the metal braided mesh tube is fixed by a sleeve, and the metal braided mesh tube is sleeved on the sleeve, which drives the metal braided mesh tube to rotate and move.

[0023] S02. Then, use a camera to scan along the circumference of the metal braided mesh tube to acquire images of the surface of the metal braided mesh tube. Specifically, the sleeve drives the metal braided mesh tube to rotate one revolution, and the camera performs image acquisition and intersection positioning. The sleeve rotates once at a specific angle, accumulating a rotation of 360°. In this embodiment of the invention, for the diamond-shaped mesh, the single rotation angle A is set according to the diameter D of the metal braided mesh tube and the mesh size L. The single rotation angle A = 2 × L / (K × D), where K is set to 0.1, and L represents the axial dimension of the mesh.

[0024] The camera system includes a first camera and a second camera. The first camera is used to coarsely locate the intersections in the circumferential direction within the cutting area to confirm the target intersections. The second camera is set along the direction directly facing the surface of the metal braided mesh tube. After confirming the target intersections, the target intersections are moved to the center point of the second camera's view. The center point of the second camera's view is used to accurately locate the target intersections. Then, the sleeve drives the metal braided mesh tube to rotate by a certain angle. The same method is used to gradually locate all target intersections in the circumferential direction of the metal braided mesh tube. The rotation angle of the sleeve driving the metal braided mesh tube is set according to the braided mesh size to ensure that after each rotation, the corresponding intersection is close to the top of the sleeve.

[0025] S03. Confirm the location of the intersection of the metal braided mesh tube based on the scanned image from the camera; The process of confirming the target intersection point through the first camera image of the present invention includes: during the initial scan, the first camera has a large field of view and can observe one or more intersection points. The view coordinates of the intersection point are compared with the center coordinates of the view window of the first camera, and the intersection point with the smallest absolute value of the X coordinate difference is taken as the first target intersection point. The first target intersection point is precisely located using a second camera. Based on the view coordinates of the first target intersection point in the first camera view after precise location, the position of the intersection points connected to it is pre-estimated. The range of view coordinates of the intersection points connected to the current intersection point after rotation is calculated based on the first camera coordinate system, mesh size, and rotation angle. When identifying the next target intersection point, it is determined whether the view coordinates of the intersection points in the image are within the estimated view coordinate range. Intersection points within the view coordinate range are connected to the first target intersection point and need to be eliminated. After eliminating the intersection points connected to the first target intersection point, a new set of intersection points is obtained. The spatial distance between the intersection points in the new set of intersection points in the first camera image and the first target intersection point is determined, and the intersection point with the smallest spatial distance is selected as the next target intersection point. Then, following the same steps, intersection points connected to the previous target intersection point are eliminated in the image during subsequent target intersection point identification. The coarse location of each target intersection point is completed sequentially each time the sleeve rotates.

[0026] The process of accurately locating the target intersection point using the center point of the second camera view includes: after the first camera confirms the target intersection point and performs coarse positioning, the distance from the target intersection point to the center point of the second camera view is calculated. Then, based on the calculation result, the entire metal braided mesh tube is moved to bring the target intersection point closer to the center area of ​​the second camera view. The second camera image acquisition is initiated, the image content is analyzed, and the intersection point information in the image is captured. Then, the movement continues until the target intersection point coincides with the center of the second camera view. The view coordinates of the intersection point are converted into XY coordinates, and the XY coordinates and the corresponding rotation platform position are recorded so that the position of the target intersection point can be adjusted during cutting, thereby enabling accurate control of the cutting position on the metal braided mesh tube.

[0027] S04. Perform laser cutting based on the confirmed intersection position, so that the laser cutting position is offset from the intersection.

[0028] First, edit the cutting head trajectory file, setting the cutting line size to the mesh size; Set laser processing parameters, including laser power, laser frequency, processing speed, and number of processing cycles, to achieve control parameters for a single laser processing operation; Edit the platform motion trajectory file based on the XY coordinates of the intersection point and the corresponding rotation platform coordinates; confirm the corresponding laser cutting position according to the center position of the second camera's view; offset the axial position of the laser cutting head from the intersection point position outward by 1-1.5mm; then move the corresponding target intersection point to the center position of the second camera's view and use the laser to cut.

[0029] like Figure 1 and Figure 2 As shown, the present invention also provides a metal braided mesh tube cutting device for implementing the above-mentioned cutting method, including a sleeve 2 for positioning and fixing the metal braided mesh tube 1, a rotary chuck 3 for clamping the sleeve 2 and driving the sleeve 2 and the metal braided mesh tube 1 to rotate, the diameter of the sleeve 2 being 0.75D≤d≤0.85D, where D is the diameter of the metal braided mesh tube; the rotary chuck 3 is mounted on a rotating mounting base 4 of a machine tool, a motion platform 5 is provided below the rotating mounting base 4 for driving the rotating mounting base 4 to move in a plane, a camera is provided on one side of the sleeve 2 for identifying and positioning the intersection points on the surface of the metal braided mesh tube 1, and a laser cutting head for cutting the metal braided mesh tube 1.

[0030] The camera of the present invention includes a first camera 6 and a second camera 7. The second camera 7 is disposed on one side of the sleeve 2 along the axis perpendicular to the sleeve 2. The first camera 6 identifies the target intersection point for laser cutting and performs coarse positioning, and the second camera 7 performs fine positioning of the target intersection point.

[0031] like Figure 1As shown, when using the cutting device of the present invention to cut metal braided mesh tubes, the corresponding sleeve 2 is selected according to the diameter of the metal braided mesh tube. After fixing the metal braided mesh tube, the sleeve 2 is clamped by the rotating chuck 3, and a coordinate system is established with the coordinate origin of the machine tool where the motion platform is located to confirm the coordinate position of the current motion platform. The position of the intersection point of the metal braided mesh tube on the horizontal plane is located directly through the coordinates of the motion platform 5. First, the target intersection point at the initial position is confirmed by the first camera, and the target intersection point at the initial position is moved to the center of the second camera window by the motion platform, and the corresponding coordinate position of the motion platform at this time is recorded. Then, the sleeve 2 is rotated by the rotating chuck 3 according to the set rotation angle, and the position of the next target intersection point is confirmed by the first camera 6 and the second camera 7. After one rotation, it returns to the starting position. After the origin, the intersection points of each target in the circumferential direction are confirmed. The coordinates of each motion platform correspond to one target intersection point. Since the metal braided mesh tube is moved by the motion platform 5, its intersection point can be accurately located at the center of the second camera 7 window. Therefore, it is only necessary to set the laser cutting head at a positive offset of 1-1.5mm from the center of the second camera window. Then, the cutting process of the metal braided mesh tube is started. Whenever the rotating chuck 3 drives the metal braided mesh tube to rotate to the corresponding angle through the sleeve 1, and the motion platform 5 moves the target intersection point according to the corresponding coordinates, the laser cuts in a straight line along the direction perpendicular to the sleeve axis. The cutting power and other parameters of the laser can be set according to the specifications of the metal braided mesh tube. This can be obtained by those skilled in the art in combination with common knowledge in the field, and will not be described in detail here.

[0032] By using the cutting device and cutting method provided by this invention, metal braided mesh tubes can be accurately cut, avoiding intersections and thus preventing fraying, ensuring processing quality while reducing processing costs.

[0033] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for laser cutting metal braided mesh tubes, characterized in that, Including the following steps: S01. Secure the metal braided mesh tube; S02. Use a camera to scan along the circumference of the metal braided mesh tube to acquire images of the surface of the metal braided mesh tube. S03. Confirm the location of the intersection of the metal braided mesh tube based on the scanned image from the camera; S04. Perform laser cutting based on the confirmed intersection position, so that the laser cutting position is offset from the intersection; In step S02, the camera includes a first camera and a second camera. The first camera is used to coarsely locate the intersection points in the circumferential direction within the cutting area to confirm the target intersection points. The second camera is set along the direction facing the surface of the metal braided mesh tube. After confirming the target intersection points, the target intersection points are moved to the position of the center point of the second camera's view. The position of the target intersection points is accurately located by the center point of the second camera's view. Then, the same method is used to gradually locate all target intersection points in the circumferential direction of the metal braided mesh tube. The process of accurately locating the target intersection point by using the center point of the second camera view includes: after the first camera confirms the target intersection point and performs coarse positioning, the distance from the target intersection point to the center point of the second camera view is calculated. Then, based on the calculation result, the metal braided mesh tube is moved as a whole to bring the target intersection point closer to the center area of ​​the second camera view. Then, the movement continues until the target intersection point coincides with the center of the second camera view. In step S04, the corresponding laser cutting position is determined according to the center position of the second camera's view, and the corresponding target intersection point is moved to the center position of the second camera's view to cut with a laser.

2. The laser cutting method for a metal braided mesh tube according to claim 1, characterized in that, In step S01, the metal braided mesh tube is fixed with a sleeve, and the metal braided mesh tube is sleeved on the sleeve, which drives the metal braided mesh tube to rotate.

3. The laser cutting method for a metal braided mesh tube according to claim 1, characterized in that, The process of confirming target intersections using the first camera image includes: during the initial scan, the intersection located in the center region of the first camera image is taken as the first target intersection. When identifying the next target intersection, intersections connected to the first target intersection are removed to obtain a new set of intersections. The spatial distance between the intersections in the new set of intersections in the first camera image and the first target intersection is determined, and the intersection with the smallest spatial distance is taken as the next target intersection. The determination of the next target intersection is based on its positional relationship with the confirmed adjacent intersections, and the coarse localization of each target intersection is completed in sequence.

4. The method for laser cutting a metal braided mesh tube according to claim 1, characterized in that, In step S04, the laser cutting position is offset from the intersection position by 1-1.5mm.

5. The laser cutting method for a metal braided mesh tube according to claim 1, characterized in that, The method employs a cutting device, which includes a sleeve (2) for positioning and fixing the metal braided mesh tube (1), a rotary chuck (3) for clamping the sleeve (2) and driving the sleeve (2) and the metal braided mesh tube (1) to rotate, the rotary chuck (3) being mounted on a rotating mounting base (4) of the machine tool, a motion platform (5) for driving the rotating mounting base (4) to move in a plane below the rotating mounting base (4), a camera for identifying and positioning the intersection points on the surface of the metal braided mesh tube (1) being mounted on one side of the sleeve (2), and a laser cutting head for cutting the metal braided mesh tube (1), the camera including a first camera (6) and a second camera (7).

6. The method for laser cutting a metal braided mesh tube according to claim 5, characterized in that, The second camera (7) is set on one side of the sleeve (2) along the axis perpendicular to the sleeve (2). The first camera (6) identifies the target intersection for laser cutting and performs coarse positioning, and the second camera (7) performs fine positioning of the target intersection.

7. The method for laser cutting a metal braided mesh tube according to claim 5, characterized in that, The diameter of the sleeve (2) is 0.75D≤d≤0.85D, where D is the diameter of the metal braided mesh tube.

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