Galvanometer marking and laser cutting integrated machine based on capacitive sensing and processing method thereof

Abstract

The present invention discloses a galvanometer marking and laser cutting integrated machine based on capacitance sensing and a processing method thereof, which comprises a workbench, a mounting plate located above the workbench and moving in the XYZ axis direction, a laser cutting head fixed on the mounting plate and provided with a metal nozzle at the bottom, a galvanometer marking unit fixed on the mounting plate, and a capacitance amplifier for measuring the capacitance between the surface of a metal workpiece placed on the workbench and the metal nozzle. The present invention uses a capacitance amplifier to sense the capacitance between the laser cutting head and the workpiece surface to measure the distance between the two, and by setting the laser cutting head and the galvanometer marking component on the same motion module, the height of the laser cutting head and the galvanometer marking component is adjusted according to the corresponding relationship between capacitance and height, and the focal length of the galvanometer, so as to ensure the accuracy of the marking height and improve the marking effect.

Description

[Technical field]

[0001] The present invention relates to the technical field of marking and cutting processing, and in particular to a galvanometer marking and laser cutting integrated machine based on capacitive sensing and a processing method thereof. [Background technology]

[0002] Lasers play an important role in more and more fields, the most common of which are laser marking and laser cutting. However, the most common operation mode is to separate laser cutting and marking into two different working areas, which results in low processing efficiency. If marking and cutting can be integrated together, processing efficiency can be greatly improved, further realizing industrial automation.

[0003] However, there is a problem that needs to be solved when using a galvanometer for laser marking on a cutting machine: galvanometer marking has high requirements for marking height, and the marking must be done at the focal position of the galvanometer to achieve the ideal effect. Metal sheets usually have a certain degree of unevenness on the needle bed. Therefore, if you want to add a galvanometer marking function to the cutting machine, you must ensure that the marking height is accurate.

[0004] Therefore, it is necessary to provide a new galvanometer marking and laser cutting integrated machine based on capacitive sensing and a processing method thereof to solve the above problems. [Summary of the invention]

[0005] One of the main purposes of the present invention is to provide a galvanometer marking and laser cutting integrated machine based on capacitive sensing, which measures the height of the metal workpiece by detecting the capacitance value between the surface of the metal workpiece and the metal nozzle at the bottom of the laser cutting head, thereby adjusting the height of the laser cutting head to achieve precise marking and cutting operations.

[0006] The present invention achieves the above-mentioned purpose through the following technical scheme: a galvanometer marking and laser cutting integrated machine based on capacitive sensing, which includes a workbench, a mounting plate located above the workbench and moving in the XYZ axis direction, a laser cutting head fixed on the mounting plate and provided with a metal nozzle at the bottom, a galvanometer marking unit fixed on the mounting plate, and a capacitive amplifier for measuring the capacitance between the surface of a metal workpiece placed on the workbench and the metal nozzle.

[0007] Furthermore, it also includes a laser controller that controls the laser cutting head to emit laser, a marking controller that controls the galvanometer marking unit to output laser, and a drive controller that controls the mounting plate to move in the Z axis. The laser controller is electrically connected to the capacitor amplifier, the marking controller, and the drive controller.

[0008] Furthermore, the laser controller receives the capacitance value transmitted back by the capacitance amplifier, obtains the distance that the Z axis needs to move according to the pre-implanted capacitance and distance relationship table, and then adjusts the height of the Z axis through the drive controller so that the focal length of the cutting laser emitted by the laser cutting head is concentrated on the surface of the workpiece and the distance between the galvanometer in the galvanometer marking unit and the workpiece surface is equal to the focal length of the galvanometer.

[0009] Furthermore, the workbench is made of conductive material.

[0010] Another object of the present invention is to provide a processing method of a galvanometer marking and laser cutting integrated machine based on capacitive sensing, which comprises the following steps:

[0011] 1) The laser cutting head and the galvanometer marking unit are moved as a whole to a set marking center point position, and the capacitance value C between the metal nozzle at the bottom of the laser cutting head and the workpiece surface is sensed by the capacitance amplifier;

[0012] 2) According to the measured capacitance value C, the capacitance and distance table is searched to obtain the corresponding distance value d2;

[0013] 3) Add the distance value d2 to the height difference d1 between the laser cutting head and the galvanometer marking unit to obtain a marking height value D1, and determine whether the marking height value D1 is equal to the galvanometer focal length D0 of the galvanometer marking unit. If they are equal, perform step 4; if they are not equal, adjust the overall height of the laser cutting head and the galvanometer marking unit to the focal length position;

[0014] 4) starting the galvanometer marking unit to perform marking;

[0015] 5) After the marking is completed, the laser cutting head is moved to the processing position to complete the cutting process.

[0016] Compared with the prior art, the beneficial effects of the capacitance sensing-based galvanometer marking and laser cutting integrated machine and its processing method of the present invention are: a capacitance amplifier is used to sense the capacitance between the laser cutting head and the workpiece surface to measure the distance between the two, and the laser cutting head and the galvanometer marking component are set on the same motion module, and the height of the laser cutting head and the galvanometer marking component are adjusted according to the corresponding relationship between capacitance and height, as well as the galvanometer focal length, so as to ensure the accuracy of the marking height and improve the marking effect.

Brief Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the structure of a galvanometer marking and laser cutting integrated machine based on capacitive sensing in an embodiment of the present invention;

[0018] Figure 2A processing method of a galvanometer marking and laser cutting integrated machine based on capacitive sensing according to an embodiment of the present invention;

[0019] The numbers in the figure represent:

[0020] 100 Galvanometer marking and laser cutting integrated machine based on capacitive sensing; 101 workpiece;

[0021] 1 workbench; 2 mounting plate; 3 laser cutting head, 31 metal nozzle; 4 galvanometer marking unit; 5 capacitor amplifier; 6 laser controller; 7 marking controller; 8 drive controller. [Specific implementation method]

[0022] Example:

[0023] Please refer to Figure 1-Figure 2 The present embodiment is a galvanometer marking and laser cutting integrated machine 100 based on capacitive sensing, which includes a workbench 1, a mounting plate 2 located above the workbench 1 and moving in the XYZ axis direction, a laser cutting head 3 fixed on the mounting plate 2 and provided with a metal nozzle 31 at the bottom, a galvanometer marking unit 4 fixed on the mounting plate 2, and a capacitance detection module 5 for measuring the capacitance between the surface of a metal workpiece 101 placed on the workbench 1 and the metal nozzle 31.

[0024] This embodiment also includes a laser controller 6 for controlling the laser cutting head 3 to emit laser, a marking controller 7 for controlling the galvanometer marking unit 4 to output laser, and a drive controller 8 for controlling the Z-axis movement of the mounting plate 2. The laser controller 6 is electrically connected to the capacitance detection module 5, the marking controller 7, and the drive controller 8.

[0025] The laser controller 6 receives the capacitance value sent back by the capacitance detection module 5, obtains the distance that the Z axis needs to move according to the pre-implanted capacitance and distance relationship table, and then adjusts the height of the Z axis through the driving controller 8, so that the focal length of the cutting laser emitted by the laser cutting head 3 is concentrated on the surface of the workpiece and the height difference between the galvanometer in the galvanometer marking unit 4 and the surface of the workpiece is exactly the focal length, thereby ensuring the marking effect.

[0026] The galvanometer marking unit 4 and the laser cutting head 3 are fixedly mounted on the same mounting plate 2, and their relative heights are fixed. The height between the two can be obtained by sensing the capacitance value between the metal nozzle 31 at the bottom of the laser cutting head 3 and the surface of the workpiece, and then the Z-axis height of the mounting plate 2 is adjusted according to the actual height obtained and the set height, thereby ensuring the accuracy of cutting processing and laser marking, and effectively solving the technical problem that the marking effect does not meet the requirements due to the uneven surface of the workbench 1 or the warping and uneven surface of the plate workpiece.

[0027] The workbench 1 is made of conductive material.

[0028] The capacitance detection module 5 may adopt a capacitance amplifier, a capacitance detection circuit module, etc., which can be directly purchased from the market. Therefore, how to detect the capacitance size will not be described in detail in this embodiment.

[0029] The galvanometer marking unit 4 can be obtained by combining a laser and a galvanometer system in the prior art, or by directly purchasing a laser galvanometer marking module.

[0030] This embodiment also provides a processing method of a galvanometer marking and laser cutting integrated machine based on capacitive sensing, which includes the following steps:

[0031] 1) The laser cutting head 3 and the galvanometer marking unit 4 are moved as a whole to the set marking center point position, and the capacitance value C between the metal nozzle 31 at the bottom of the laser cutting head 3 and the surface of the workpiece is sensed by the capacitance detection module 5;

[0032] 2) According to the measured capacitance value C, the capacitance and distance table is searched to obtain the corresponding distance value d2;

[0033] 3) Add the distance value d2 to the height difference d1 between the laser cutting head 3 and the galvanometer marking unit 4 to obtain the marking height value D1, and determine whether the marking height value D1 is equal to the galvanometer focal length D0 of the galvanometer marking unit 4. If they are equal, execute step 4; if they are not equal, adjust the overall height of the laser cutting head 3 and the galvanometer marking unit 4 to the focal length position;

[0034] 4) Start the galvanometer marking unit 4 to perform marking;

[0035] 5) After the marking is completed, the laser cutting head 3 is moved to the processing position to complete the cutting process.

[0036] In order to ensure that the galvanometer marking is at a fixed focal length position, it is required that the sum of the height difference d1 between the bottom surface of the galvanometer marking unit 4 and the bottom surface of the laser cutting head 3 and the distance d2 obtained by sensing the capacitance value between the bottom surface of the laser cutting head 3 and the workpiece surface by the capacitance detection module 5 is a fixed value and equal to the galvanometer focal length D0; during actual processing, there will be some warping on the workpiece surface or the surface of the worktable 1 will be uneven, which will cause the distance between the galvanometer and the workpiece surface to be unequal to the galvanometer focal length D0. At this time, the height of the mounting plate 2 is adjusted so that the marking height value D1 is equal to the galvanometer focal length D0, ensuring that the galvanometer height is at the focal position during marking, thereby achieving a better marking effect.

[0037] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. Galvanometer marking and laser cutting machine based on capacitive sensing, characterized by: It includes a workbench, a mounting plate located above the workbench and moving in the XYZ axis direction, a laser cutting head fixed on the mounting plate and provided with a metal nozzle at the bottom, a galvanometer marking unit fixed on the mounting plate, and a capacitance amplifier for measuring the capacitance between the surface of a metal workpiece placed on the workbench and the metal nozzle; The capacitive sensing-based galvanometer marking and laser cutting integrated machine further includes a laser controller for controlling the laser cutting head to emit laser light, a marking controller for controlling the galvanometer marking unit to output laser light, and a drive controller for controlling the mounting plate to move along the Z axis, wherein the laser controller is electrically connected to the capacitive amplifier, the marking controller, and the drive controller; The laser controller receives the capacitance value sent back by the capacitance amplifier, obtains the distance that the Z axis needs to move according to the capacitance and distance relationship table implanted in advance, and then adjusts the height of the Z axis through the driving controller, so that the focal length of the cutting laser emitted by the laser cutting head is concentrated on the surface of the workpiece and the distance between the galvanometer in the galvanometer marking unit and the surface of the workpiece is equal to the focal length of the galvanometer; the workbench is made of conductive material; The processing method of the galvanometer marking and laser cutting integrated machine based on capacitive sensing comprises the following steps: 1) The laser cutting head and the galvanometer marking unit are moved as a whole to a set marking center point position, and the capacitance value C between the metal nozzle at the bottom of the laser cutting head and the workpiece surface is sensed by the capacitance amplifier; 2) According to the measured capacitance value C, the capacitance and distance table is searched to obtain the corresponding distance value d2; 3) Add the distance value d2 to the height difference d1 between the laser cutting head and the galvanometer marking unit to obtain a marking height value D1, and determine whether the marking height value D1 is equal to the galvanometer focal length D0 of the galvanometer marking unit. If they are equal, execute step 4; if they are not equal, adjust the overall height of the laser cutting head and the galvanometer marking unit to the focal length position; 4) starting the galvanometer marking unit to perform marking; 5) After the marking is completed, the laser cutting head is moved to the processing position to complete the cutting process.

Images