Two-dimensional laser cleaning method based on phase modulation

Abstract

This invention proposes a laser cleaning device, including a laser, an X-axis motor, an X-axis galvanometer, a Y-axis motor, a Y-axis galvanometer, a field mirror, and a workpiece. The laser beam from the laser passes through the X-axis and Y-axis galvanometers and then through the field mirror before illuminating the workpiece. The output shaft of the X-axis motor is connected to the X-axis galvanometer, and the output shaft of the Y-axis motor is connected to the Y-axis galvanometer. This invention also proposes a two-dimensional laser cleaning method based on phase modulation, including the laser cleaning device and the following steps: S1: placing the workpiece to be cleaned on a cleaning table; S2: adjusting the laser, generating a laser beam, which is then transmitted to the field mirror through the X-axis and Y-axis galvanometers, and illuminating the surface of the workpiece. The laser beam is focused on the area to be cleaned on the workpiece. This two-dimensional laser cleaning method based on phase modulation does not require additional performance from the galvanometer and motor, and can achieve a uniform, fully filled cleaning effect without increasing costs.

Description

Technical Field

[0001] This invention relates to the field of laser processing technology, and more specifically to a two-dimensional laser cleaning method based on phase modulation. Background Technology

[0002] The laser light generated by the laser enters a two-dimensional galvanometer, and after reflection by the X-axis and Y-axis galvanometers, it strikes the workpiece. The movement of the X-axis galvanometer causes the laser to move along the X-axis on the workpiece, while the Y-axis galvanometer causes movement along the Y-axis. The combined action of the two galvanometers creates a two-dimensional planar cleaning effect. The galvanometer is driven by a galvanometer motor, and the movement of the galvanometer motor is controlled by an input control signal.

[0003] Current two-dimensional cleaning solutions commonly employ a method of inputting regular control signals, such as triangular or sine waves, to the X and Y axes respectively. The drawback of this method is that the fixed input signals for both axes result in a relatively fixed cleaning trajectory, making it prone to missed areas or excessive ablation. Summary of the Invention

[0004] This invention proposes a two-dimensional laser cleaning method based on phase modulation, which solves the problems mentioned in the background section.

[0005] The technical solution of this invention is implemented as follows:

[0006] A laser cleaning device includes a laser, an X-axis motor, an X-axis galvanometer, a Y-axis motor, a Y-axis galvanometer, a field mirror, and a workpiece. The laser beam from the laser passes through the X-axis and Y-axis galvanometers and then through the field mirror before shining onto the workpiece. The output shaft of the X-axis motor is connected to the X-axis galvanometer, and the output shaft of the Y-axis motor is connected to the Y-axis galvanometer.

[0007] Furthermore, the X-axis and Y-axis galvanometers are used to apply the laser beam to the workpiece.

[0008] Furthermore, a collimating mirror is provided between the laser and the X-axis galvanometer, and the laser beam is emitted in front of the X-axis galvanometer and passes through the collimating mirror.

[0009] A two-dimensional laser cleaning method based on phase modulation includes a laser cleaning apparatus and further includes the following steps:

[0010] S1: Place the workpiece to be cleaned on the cleaning table;

[0011] S2: Adjust the laser. After the laser beam is generated, it is transmitted to the field mirror through the X-axis and Y-axis galvanometers and then irradiates the surface of the workpiece to be cleaned through the field mirror. The laser beam focus of the laser is focused on the part of the workpiece to be cleaned.

[0012] S3: The X-axis and Y-axis galvanometers are controlled by calling the program algorithm to match the laser beam and output laser. One of the control signals of the X-axis motor and the Y-axis motor adopts a phase modulation signal, and the other adopts a regular signal such as a triangular wave or a sine wave.

[0013] S4: Because the phase of the phase modulation signal is constantly changing, the cleaning trajectory of the laser beam can fill the entire area of ​​the workpiece being processed, and the filling method is approximately uniformly distributed.

[0014] Furthermore, one of the control signals for the X-axis motor and the Y-axis motor adopts a regular signal. Taking a standard sine wave signal as an example, the formula is: 1)

[0015] In Equation 1): It is the signal amplitude. It is angular frequency. It's time.

[0016] Furthermore, the other control signal in the X-axis motor and Y-axis motor adopts a phase modulation signal. Taking a sinusoidal phase modulation signal as an example, the formula is: 3)

[0017] In formula 3): It is the signal amplitude. It is angular frequency. It is time. It is the phase that changes over time.

[0018] The beneficial effects of the technical solution provided in this application are as follows:

[0019] 1. This phase modulation-based two-dimensional laser cleaning method overcomes the omission and excessive ablation problems of traditional cleaning schemes without increasing the performance requirements of the galvanometer, resulting in a uniform cleaning effect in the cleaning area. The phase modulation method does not require additional performance of the galvanometer motor and can achieve a uniform cleaning effect with full filling without increasing costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram illustrating the working principle of the present invention;

[0022] Figure 2 This is a schematic diagram of the cleaning trajectory in Embodiment 1 of the present invention;

[0023] Figure 3 This is a schematic diagram of the cleaning trajectory for Comparative Examples 1 and 2 of the present invention.

[0024] In the diagram: 1. Laser, 2. X-axis motor, 3. X-axis galvanometer, 4. Y-axis motor, 5. Y-axis galvanometer, 6. Field mirror, 7. Workpiece. Detailed Implementation

[0025] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example

[0026] A laser cleaning device includes a laser 1, an X-axis motor 2, an X-axis galvanometer 3, a Y-axis motor 4, a Y-axis galvanometer 5, a field mirror 6, and a workpiece 7. The laser beam from the laser 1 passes through the X-axis galvanometer 3 and the Y-axis galvanometer 5 and then through the field mirror 6 before shining onto the workpiece 7. The output shaft of the X-axis motor 2 is connected to the X-axis galvanometer 3, and the output shaft of the Y-axis motor 4 is connected to the Y-axis galvanometer 5.

[0027] In this embodiment, the X-axis galvanometer 3 and the Y-axis galvanometer 5 are used to apply the laser beam to the workpiece 7.

[0028] In this embodiment, a collimating lens 8 is still provided between the laser 1 and the X-axis galvanometer 3, and the laser beam is emitted in front of the X-axis galvanometer 3 and passes through the collimating lens 8.

[0029] A two-dimensional laser cleaning method based on phase modulation includes a laser cleaning apparatus and further includes the following steps:

[0030] S1: Place the workpiece 7 to be cleaned on the cleaning table;

[0031] S2: Adjust laser 1. After the laser beam is generated, it is transmitted to field mirror 6 through X-axis galvanometer 3 and Y-axis galvanometer 5, and then irradiates the surface of workpiece 7 to be cleaned through field mirror 6. The laser beam focus of laser 1 is focused on the part of workpiece 7 to be cleaned.

[0032] S3: The X-axis galvanometer 3 and Y-axis galvanometer 5 are controlled by calling the program algorithm to match the laser beam and output laser. One of the control signals of the X-axis motor 2 and the Y-axis motor 4 adopts a phase modulation signal, and the other adopts a regular signal such as a triangular wave or a sine wave.

[0033] S4: Because the phase of the phase modulation signal is constantly changing, the cleaning trajectory of the laser beam can fill the entire area of ​​the workpiece being processed, and the filling method is approximately uniformly distributed.

[0034] In this embodiment, one of the control signals of the X-axis motor 2 and the Y-axis motor 4 adopts a regular signal. Taking a standard sine wave signal as an example, the formula is: 1)

[0035] In Equation 1): It is the signal amplitude. It is angular frequency. It's time.

[0036] In this embodiment, the other control signal in the X-axis motor 2 and Y-axis motor 4 adopts a phase modulation signal. Taking a sinusoidal phase modulation signal as an example, the formula is: 3)

[0037] In formula 3): It is the signal amplitude. It is angular frequency. It is time. It is the phase that changes over time.

[0038] The method and apparatus are the same as in Embodiment 1, except that the other control signal in X-axis motor 2 and Y-axis motor 4 adopts a sinusoidal regular signal with the formula: 2) .

[0039] In Equation 2): It is the signal amplitude. It is angular frequency. It is time. It is a phase that remains constant over time.

[0040] The method and apparatus are the same as in Embodiment 1, except that the two control signals of the X-axis motor 2 and the Y-axis motor 4 are both sinusoidal regular signals, and the formula is: 1)

[0041] In Equation 1): It is the signal amplitude. It is angular frequency. It's time.

[0042] The cleaning trajectories of Example 1 and Comparative Examples 1-2 were compared. A schematic diagram of the cleaning trajectories is shown below. Figure 2 and Figure 3 :

[0043] The cleaning trajectory diagrams for Comparative Example 1 and Comparative Example 2 are shown below. Figure 2As shown, similar to the situation with triangular waves or other regular signals, the cleaning frequency on the edges of the cleaning area increases excessively and tends to be dense. Besides the edge cleaning areas, the cleaning spacing increases towards the center. Using regular signals like triangular waves and sine waves leads to uneven cleaning, making it easy for cleaning areas to be missed or excessively ablated. A schematic diagram of the cleaning trajectory in Example 1 is shown below. Figure 3 As shown, since the phase of the phase modulation signal is constantly changing, the macroscopic cleaning trajectory can fill the entire area, and the filling method is approximately uniformly distributed, avoiding the phenomenon of omission or excessive ablation in the traditional method. The phase modulation method does not have additional performance requirements for the galvanometer motor and can achieve a uniform cleaning effect of full filling without increasing costs.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A two-dimensional laser cleaning method based on phase modulation, applied to a laser cleaning device, the device comprising a laser (1), an X-axis motor (2), an X-axis galvanometer (3), a Y-axis motor (4), a Y-axis galvanometer (5), a field lens (6) and a workpiece (7); the laser beam of the laser (1) is irradiated on the workpiece (7) after penetrating the field lens (6) through the X-axis galvanometer (3) and the Y-axis galvanometer (5), wherein the output shaft of the X-axis motor (2) is connected to the X-axis galvanometer (3), and the output shaft of the Y-axis motor (4) is connected to the Y-axis galvanometer (5); characterized in that, Further comprising the following steps: S1: placing the workpiece to be cleaned (7) on the cleaning table; S2: adjusting the laser (1), after the laser beam is generated, it is transmitted to the field lens (6) through the X-axis galvanometer (3) and the Y-axis galvanometer (5), and is irradiated to the surface of the workpiece to be cleaned (7) through the field lens (6), and the focal point of the laser beam of the laser (1) is focused on the part to be cleaned of the workpiece to be cleaned (7); S3: control the movement of the X-axis galvanometer (3) and the Y-axis galvanometer (5) to match the laser beam by calling the program algorithm to output the laser, one of the control signals of the X-axis motor (2) and the Y-axis motor (4) adopts a phase modulation signal, and the other adopts a regular signal such as a triangular wave and a standard sine wave; S4: due to the fact that the phase of the phase modulation signal is constantly changing, the cleaning track of the laser beam can fill the entire area of the processed object, and the filling mode is approximately uniformly distributed; The rule signal is a standard sinusoidal signal, and the formula is: 1) In formula 1): is a signal amplitude, is an angular frequency, is time; wherein the phase modulation signal is a sinusoidal phase modulation signal, the formula being:3) , in formula 3): is the signal amplitude, is the angular frequency, is the time, is the phase as a function of time.

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