KR20230108725A - Automatic real-time GV value detection and compensation method and system - Google Patents

Abstract

In the automatic real-time GV value detection and compensation method and system disclosed by the present invention, the method comprises the steps of constructing a relationship curve between rotation angle and GV value, wherein the rotation angle corresponds to the energy of the laser incident on the marking point. , Acquiring the image of the marking point at the same time as laser marking, and obtaining the actual GV value of the marking point based on the acquired image, if the actual GV value of the marking point exceeds the preset range, the configured rotation angle and GV value Determining an angle required for rotation according to the relationship curve, and matching the laser energy incident on the marking point with the actual GV value by adjusting the rotation angle. The present invention constructs a controllable parameter variable having a function relationship with the GV value through the construction of a rotation angle and GV value relationship curve, thereby solving the problem of a large amount of products being discarded due to a change in the GV value.

Description

Automatic real-time GV value detection and compensation method and system

The present invention relates to the field of laser marking and sensing technology, and more particularly to a system for automatic real-time sensing and compensation of GV values.

With the development of technology, the laser marking machine, which uses a laser beam to focus and burn the workpiece surface to realize marking processing, has already become a common equipment for engraving and marking processing, and its high speed and precision have gained popularity in the industry. However, in the process of automatic processing, the GV value of the marking point changes due to other uncontrollable factors such as laser power attenuation, component aging, etc. If these changes are not detected or treated in a timely manner, it will lead to mass discard of processed products. It is easy to break, and has a serious impact on production processing efficiency and product yield.

According to the search, in the laser marking method of Japanese Patent Publication No. JP5589318B2 published on September 17, 2014, the method changes the peak power of pulsed light by changing the pulse duration, and furthermore, marking in a situation where the processing speed is not changed Changes the gray level of the pattern. In the laser marking method of European Patent Publication No. EP3088200B1 published on November 3, 2021, the method calculates the output power of the marking point according to the gray level of the marking point, and outputs the laser with the calculated output power. In the case manufacturing method of Chinese Patent Publication No. CN112872603A published on June 1, 2021, the method sets the laser energy of laser engraving through the gray level of the target pattern, and performs laser engraving processing according to the set laser energy . The above-mentioned patent uses the relationship between the gray level of the marking pattern and the laser energy to change the gray level of the marking pattern, or to obtain the laser marking output corresponding to the gray level using the relationship. Therefore, since only the effect of the real-time GV value of the marking point on the marking effect was considered during the laser marking process, the problem of mass discarding of products due to the change in real-time GV was not solved.

Currently, a related technology capable of preventing mass discard of products due to changes in GV values in the automatic processing process has not yet been developed. Therefore, in order to effectively prevent this risk, it is essential to provide a method for detecting and compensating for a GV value in real time.

In order to solve the above-mentioned conventional technical disadvantages, the present invention provides an automatic real-time GV value detection and compensation method and system that solves at least one of the above-mentioned technical problems.

According to one aspect of the present specification, the automatic real-time GV value detection and compensation method includes the following steps.

Forming a relationship curve between the rotation angle and the GV value, wherein the rotation angle corresponds to the energy of the laser incident on the marking point.

Acquiring an image of the marking point simultaneously with laser marking, and obtaining an actual GV value of the marking point based on the acquired image.

When the actual GV value of the marking point exceeds the preset range, the required rotation angle is determined according to the relationship curve between the configured rotation angle and the GV value, and the laser energy incident on the marking point and the actual GV value are measured by adjusting the rotation angle. matching step.

In the above technical solution, by constructing a controllable parameter variable having a function relationship with the GV value through the construction of a relationship curve between the rotation angle and the GV value, the actual GV value of the marking point is obtained at the same time as laser marking, and the actual GV When the value exceeds the preset range, the value of the controllable parameter variable is determined through the relationship curve between the configured rotation angle and the GV value, and the value of the parameter variable is changed to control the actual GV value within the standard range. As a result, the problem of discarding a large amount of products due to the change in GV value is solved.

As a further technical solution, the method builds a polarization state adjustment component on the laser marking optical path, the polarization state adjustment component has an adjustable angle, and when the angle adjustment of the polarization state adjustment component is changed, and also changing the intensity and direction of light incident on the marking point through the polarization state adjusting component.

The technical solution uses a polarization state adjusting component on the laser marking optical path to adjust the output intensity of the laser light, so that the laser energy incident to the marking point through the polarization state adjusting component is also changed according to the angle change, and the angle is adjusted. As this controllable variable called , can provide the GV value of the marking point that meets the product quality requirements when marking, as the adjusted laser energy implements the adjustment of the laser energy incident on the marking point, the change in the GV value This avoids product disposal problems.

As a further technical solution, the polarization state adjusting component includes a movable polarizer and a fixed polarizer sequentially provided along a laser marking optical path, and the movable polarizer can rotate relative to the fixed polarizer.

The technical solution uses the asymmetric principle of the polarizer to change the polarization state of light passing through the fixed polarizer through the angle control of the movable polarizer, so that the characteristics of light waves incident on the product surface through the polarization state adjusting component are changed, Changes in light wave characteristics also lead to changes in the processing effect of beams on the product surface. That is, the GV value of the marking point is changed. Accordingly, the GV value of the marking point may be changed by adjusting the rotation angle of the movable polarizer relative to the fixed polarizer. Similarly, when the GV value of the marking point is changed, the amount of change in the GV value may be compensated for by adjusting the rotation angle of the movable polarizer relative to the fixed polarizer.

As an additional technical solution, the configuration of the rotation angle and GV value relationship curve is to set the rotation start point and the single rotation angle of the movable polarizer, rotate the movable polarizer clockwise or counterclockwise, and rotate the single rotation angle. Recording the actual angle of the movable polarizer and the GV value of the corresponding marking point each time, according to the recorded actual angle of the plurality of movable polarizers and the GV value of the corresponding marking point, constructing a rotation angle and GV value relationship curve Include more steps.

The technical solution uses the principle that the GV value of the marking point is related to the laser energy incident on the marking point, and makes the change of the marking point GV value and the change of the laser energy incident on the marking point correspond to each other, and the incident incident on the marking point. Corresponds the change of laser energy to be incident to the change of light intensity incident on the marking point, the change of light intensity incident to the marking point and the change of the angle of the movable polarizer relative to the fixed polarizer, and finally, the relationship between the rotation angle and the GV value By constructing a curve, the relationship between the GV value of the marking point and the controllable angular variable is established, and the amount of change in the GV value is compensated for by adjusting the angular variable, and the GV due to laser power attenuation, component aging, and other uncontrollable factors Compensate for value changes.

As a further technical solution, when the movable polarizer is rotated parallel to the polarization direction of the stationary polarizer, the intensity of light passing through the polarization state adjusting component is maximized. When the movable polarizer is rotated perpendicular to the polarization direction of the stationary polarizer, the intensity of light passing through the polarization conditioning component is minimized.

In the technical scheme, the laser light is converted to one-way polarization after passing through a movable polarizer (the polarization direction can be changed through the rotation angle), and the polarized light directly passes through a fixed polarizer, and the polarizer changes the polarization direction and polarization direction. Since only parallel vibrations pass through and at the same time filter out light vibrating perpendicular to that direction, the intensity of light passing through the fixed polarizer is maximized when the polarization directions of the movable polarizer and the fixed polarizer are completely parallel, and minimized when perpendicular to the polarization direction. .

As a further technical solution, the method calculates the difference between the actual GV value and the GV value when the actual GV value of the marking point exceeds the preset range, and based on the difference and the relationship curve between the configured rotation angle and the GV value. determining a rotation angle necessary to compensate for the difference, and rotating the movable polarizer at the rotation angle to match laser energy incident on the marking point to an actual GV value.

In the technical scheme, first determine the standard GV value according to the equipment or product, and determine the preset range of the allowable GV value based on the standard GV value, and then, in the automatic processing process, the GV value of the product marking point in real time , and calculate whether the GV value is within a preset range. If it is within the set range, the difference between the GV value and the standard GV value is substituted into the configured rotation angle and GV value relationship curve to obtain the angle required for rotation of the movable polarizer, and the movable polarizer rotates at the corresponding angle By changing the laser energy incident on the marking point, the GV value in the preset range can be compensated within the normal range.

According to one aspect of the present specification, an automatic real-time GV value detection and compensation system includes an emission component, a marking component, an imaging component, a control component, and a polarization state adjusting component, wherein the emission component, the polarization component The conditioning component and the marking component are provided on the laser marking optical path, the imaging component is provided on the GV value sensing optical path, and the emission component, marking component, imaging component and polarization conditioning component are provided on the GV value detection optical path. Each is connected to a control component. The emitting component is used for laser emission. The marking component is used for marking on products. The imaging component is used to acquire and transmit an image of the marking point to the control component while marking. The control component analyzes the actual GV value of the marking point according to the marking point image, and when the actual GV value exceeds the preset range, determines the rotation angle to be adjusted according to the configured rotation angle and the relationship curve of the GV value. and output the rotation angle command to the polarization conditioning component. The polarization state adjusting component is used to rotate the angle according to the rotation angle command so that the laser energy passing through the polarization state rotation component and incident on the marking point matches the actual GV value.

In the above technical scheme, the control component controls the emission component and the marking component to realize laser marking on the product surface, while controlling the imaging component to obtain an image of the marking point at the same time as the laser marking; Based on the acquired image, the actual GV value of the marking point is obtained. When the actual GV value exceeds the preset range, the rotation angle is output to the polarization state adjusting component, and the polarization state is substituted into the laser energy incident on the marking point. By controlling the regulating component to compensate for the change in the actual GV value, the finally marked product can meet the processing quality requirements, and the problem of discarding large quantities of products due to the change in GV value is solved.

As a further technical solution, the polarization state adjusting component is composed of a movable polarizer and a fixed polarizer, and the movable polarizer can rotate a preset angle relative to the fixed polarizer. The technical solution is an implementation means provided to adjust the controllable variable of the amount of laser energy incident on the marking point, and changes the polarization state of light passing through the fixed polarizer by controlling the angle of the movable polarizer using the asymmetric principle of the polarizer. and further, as the laser energy incident on the marking point is changed, the purpose of realizing the change of laser energy through the change of the rotation angle of the polarizer and further compensating for the change of the GV value through the change of the laser energy is achieved.

As an additional technical solution, a driving component is connected to the movable polarizer. The drive component is connected to the control component and used to rotate the movable polarizer by a preset angle under the control of the control component. The technical solution implements automatic rotation of the movable polarizer through matching of a control component and a drive component, and the drive component can be implemented through a stepping motor or other driving device capable of rotating the movable polarizer at a rotational angle. there is.

As a further technical solution, the system further includes a return component used to direct the emitted laser to the marking element and direct the light reflected from the marking point to the imaging element. The technical solution realizes the close arrangement of the emission component, the marking component, the imaging component and the polarization state adjusting component through the return component, so as to achieve high integration of the entire equipment and reduce the occupied volume of the equipment. Also, the control component may be integrated with other components or may be provided separately.

Compared with the prior art, the beneficial effects of the present invention are as follows.

(1) In the method provided by the present invention, as the method constructs a controllable parameter variable having a functional relationship with the GV value through the construction of a relationship curve between the rotation angle and the GV value, the laser marking and the marking point at the same time Acquire the actual GV value, when the actual GV value exceeds the preset range, determine the value of this controllable parameter variable through the relationship curve of the configured rotation angle and GV value, and change the value of the parameter variable to As the actual GV value is controlled within the standard range, the problem of discarding a large amount of products due to the change in GV value is solved.

(2) In the system provided by the present invention, the control component controls the emission component and the marking component to realize the laser marking process on the product surface, while the imaging component controls the laser marking and marking simultaneously. Control to acquire the image of the point, obtain the actual GV value of the marking point based on the acquired image, output the rotation angle to the polarization conditioning component when the actual GV value exceeds the preset range, By controlling the polarization state adjusting component to adjust the incident laser energy, compensating for the amount of change in the actual GV value, the finally marked product can meet the processing quality requirements, resulting in the scrapping of mass products due to the change in GV value. The problem is solved.

(3) The present invention implements the controllable adjustment of laser energy through two polarizers by using the asymmetric principle of polarization, establishes a correlation between the relative rotation angle between the two polarizers and the marking point GV value, By changing the laser energy incident on the marking point through the change and further compensating for the amount of change in the marking point GV value, the problem of GV value change due to other uncontrollable factors such as laser output attenuation, component aging, etc. is solved, Furthermore, the problem of discarding mass products due to changes in the marking point GV value is solved.

(4) The present invention detects the GV value of the marking point at the same time as laser marking, and sets controllable variables related to the GV value to compensate for the real-time change of the GV value, thereby real-time detection of the GV value of the marking point in the automated processing process, and Adjustment is implemented to improve processing efficiency and at the same time ensure processing quality.

1 is a perspective view of a system used in an automatic real-time GV value detection and compensation method according to an embodiment of the present invention;
2 is a flowchart of an automatic real-time GV value detection and compensation method according to an embodiment of the present invention;
3 is a perspective view of adjusting a polarization rotation angle according to an embodiment of the present invention;
4 is a perspective view of a rotation angle and GV value relationship curve according to an embodiment of the present invention;
5 is a perspective view of an automatic real-time GV value detection and compensation system according to an embodiment of the present invention.

The technical solutions provided by the embodiments of the present invention are clearly and completely described in the following in conjunction with the drawings. Apparently, the disclosed embodiments are only some examples, not all of the embodiments provided by the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.

Example 1.

In the automatic real-time GV value detection and compensation method provided by this embodiment, the method is implemented using a system for synchronously implementing laser marking processing and GV value detection as shown in FIG. , a marking head, an imaging system, and a polarization conditioning component (not shown).

As shown in FIG. 2 , the method specifically includes the following steps.

S1. Configuring a GV value relationship, configuring a rotation angle and GV value relationship curve, wherein the rotation angle corresponds to laser energy incident on the marking point.

As shown in Fig. 3, the polarization state adjusting component is composed of a movable polarizer and a fixed polarizer, the movable polarizer is set as polarizer P1, the fixed polarizer is set as polarizer P2, and the laser light emitted by the laser is It is incident on the product surface through sequentially polarizer P1, polarizer P2, and marking head.

Specifically, the configuration of the rotation angle and GV value relationship curve is the step of setting the rotation start point and the single rotation angle of the movable polarizer, rotating the movable polarizer clockwise or counterclockwise, each time the single rotation angle is rotated. Recording the actual angle of the movable polarizer and the GV value of the corresponding marking point, constructing a rotation angle and GV value relationship curve according to the recorded actual angle of the plurality of movable polarizers and the GV value of the corresponding marking point include In the configuration, under the assumption that the laser energy incident on the movable polarizer does not change, the laser energy incident on the marking point is changed only by changing the rotation angle of the movable polarizer relative to the fixed polarizer, and at this time, the GV value of the corresponding marking point Record.

Depending on the facility or product, different rotation angles and GV value relationship curves can be configured. As shown in FIG. 4, the table at the bottom of the drawing shows a plurality of rotation angles and GV values obtained by this embodiment, and the curve at the top of the drawing shows the changing trend of these data. When the movable polarizer rotates parallel to the polarization direction of the fixed polarizer, the intensity of light passing through the fixed polarizer is maximized. When the movable polarizer rotates perpendicularly to the polarization direction of the fixed polarizer, the intensity of light passing through the fixed polarizer is minimized.

S2. In the step of detecting the GV value online, an image of the marking point is acquired simultaneously with laser marking, and an actual GV value of the marking point is obtained based on the acquired image. At the same time as laser marking, when the light reflected from the product surface marking point reaches the imaging component, the imaging component acquires a real-time image of the current marking point and sends it to the control component, which controls the image based on the identification. Get the actual GV value of the marking point.

The imaging element can be provided on the reflective optical path, and the light reflected from the marking point on the product surface enters the marking head and enters the imaging element through the marking head, so that laser marking and GV value detection can be realized simultaneously.

Alternatively, by providing an imaging component on top of the product and simultaneously controlling the marking head and the imaging component through a control component, laser marking and GV value detection may be simultaneously implemented.

S3. Automatically compensating the GV value, when the actual GV value of the marking point exceeds the preset range, the angle required for rotation is determined according to the configured rotation angle and GV value relationship curve, and the angle incident on the marking point is adjusted through rotation angle adjustment. Match the laser energy to the actual GV value.

In the automatic processing process, through real-time monitoring of the marking point GV value of the product under the marking head, when the actual GV value of the marking point exceeds the preset range, it calculates the difference between the actual GV value and the standard GV value, and calculates the difference between the actual GV value and the standard GV value. And determining a rotation angle necessary to compensate for the difference based on the relationship curve between the configured rotation angle and the GV value, rotating the movable polarizer at the rotation angle, matching the laser energy incident on the marking point to the actual GV value, The amount of change in the GV value is compensated.

As shown in FIG. 4, when the normal GV value is 120, the corresponding angle is -60° or 60°, and when the GV value is reduced to 100 (i.e., the difference value is 20), the system operates from 50° to 60°. If we call the trend section between and calculate the 55° turn at this time, we can adjust the GV value to 120. At the same time, the curve to the left of 0° moves 5° to the right, and the curve to the right of 0° moves 5° to the left.

In addition, in the trend section call between 50° and 60°, where 50° corresponds to a GV value of 162 and 60° corresponds to a GV value of 123, in this range, the angle is X and the GV value is Y. is set Since the trend interval can be regarded as a linear relationship through the constructed relationship curve, Y=aX+b, and by substituting the above two data sets, Y=-3.9X+357, |50<=X<=60| .

At this time, if Y suddenly drops to 20 and Y1 is set to a reduced GV function, Y1 = Y-20, Y1 = -3.9X + 357-20.

Since the GV value needs to be restored to 120, that is, if X=55.6° is obtained from Y1=120, 120=-3.9X+337, the angle to be rotated can be calculated at this time. Considering the convenience of actual operation, the amount of change in the GV value can be compensated for by performing 55° angular rotation under the premise that the effectiveness of GV compensation is not affected.

Example 2.

As shown in FIG. 5 , the automatic real-time GV value detection and compensation system provided by this embodiment includes an emission component, a marking component, an imaging component, a control component, a return component, and a polarization state adjusting component. wherein the emitting element, the polarization state adjusting element and the marking element are provided on a laser marking optical path, the imaging element is provided on a GV value sensing optical path, the emitting element, the marking element, The imaging component and the polarization conditioning component are each connected to the control component. The return component includes at least one reflector to implement return of an optical path in a laser marking optical path and/or a GV value sensing optical path.

The emitting component is used for laser emission. The marking component is used for marking on products. The imaging component is used to acquire and transmit an image of the marking point to the control component while marking. The control component analyzes the actual GV value of the marking point according to the marking point image, and when the actual GV value exceeds the preset range, determines the rotation angle to be adjusted according to the configured rotation angle and the relationship curve of the GV value. and output the rotation angle command to the polarization conditioning component. The polarization state adjusting component is used to rotate the angle according to the rotation angle command so that the laser energy passing through the polarization state rotation component and incident on the marking point matches the actual GV value. The return element is used to direct the emitted laser to the marking element and to direct the light reflected from the marking point to the imaging element.

The polarization state adjusting component is composed of a movable polarizer and a fixed polarizer, and the movable polarizer can rotate a preset angle relative to the fixed polarizer. In this embodiment, the polarization state of light passing through the fixed polarizer is changed by controlling the angle of the movable polarizer using the asymmetric principle of the polarizer, and furthermore, as the laser energy incident on the marking point is changed, the change in the rotation angle of the polarizer is reduced. The purpose of realizing a change in laser energy through a change in laser energy and further compensating for a change in a GV value through a change in laser energy is achieved.

A driving component is connected to the movable polarizer. The drive component is connected to the control component and used to rotate the movable polarizer by a preset angle under the control of the control component. The driving component may be implemented through a stepping motor or other driving device capable of rotating the movable polarizer at a rotational angle.

In this embodiment, the control component controls the emission component and the marking component to implement the laser marking process on the product surface, and the imaging component controls the laser marking and simultaneously acquires the image of the marking point. Obtain the actual GV value of the marking point based on the image, and if the actual GV value exceeds the preset range, output the rotation angle to the polarization conditioning component, configure polarization conditioning to substitute the laser energy incident on the marking point By controlling the factors to compensate for the change in the actual GV value, the finally marked product can meet the processing quality requirements, solving the problem of discarding large quantities of products due to the change in GV value.

Finally, the above embodiments are not intended to limit the technical solution of the present invention, but only to illustrate it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that it can still be modified according to the technical solutions described in the foregoing embodiments, or some or all of its technical features can be equally replaced. can However, such modification or substitution does not deviate the essence of the technical solution from the technical solution of the embodiment of the present invention.

Claims (10)

In the automatic real-time GV value detection and compensation method,
Forming a relationship curve between the rotation angle and the GV value, wherein the rotation angle corresponds to the energy of the laser incident on the marking point;
Acquiring an image of a marking point simultaneously with laser marking, and obtaining an actual GV value of the marking point based on the acquired image;
When the actual GV value of the marking point exceeds the preset range, the required rotation angle is determined according to the relationship curve between the configured rotation angle and the GV value, and the laser energy incident on the marking point and the actual GV value are measured by adjusting the rotation angle. An automatic real-time GV value detection and compensation method comprising the step of matching. According to claim 1,
The method,
A polarization control element is built on the laser marking optical path, the polarization control element has an adjustable angle, and when the angle adjustment of the polarization control element is changed, the polarization control element is used to mark the marking point. Automatic real-time GV value detection and compensation method further comprising the step of changing the intensity and direction of the incident light. According to claim 2,
The automatic real-time GV value detection and compensation method according to claim 1 , wherein the polarization state adjusting component comprises a movable polarizer and a fixed polarizer provided sequentially along the laser marking optical path, and wherein the movable polarizer is rotatable relative to the fixed polarizer. . According to claim 3,
The configuration of the rotation angle and GV value relationship curve is,
Setting the rotation start point and single rotation angle of the movable polarizer;
Rotating the movable polarizer clockwise or counterclockwise, and recording the actual angle of the movable polarizer and the GV value of the corresponding marking point each time a single rotation angle is rotated;
The automatic real-time GV value detection and compensation method further comprising the step of constructing a rotation angle and GV value relationship curve according to the recorded actual angles of the plurality of movable polarizers and the GV values of the corresponding marking points. According to claim 3,
When the movable polarizer is rotated parallel to the polarization direction of the stationary polarizer, the intensity of light passing through the polarization conditioning component is maximized;
When the movable polarizer is rotated perpendicular to the polarization direction of the fixed polarizer, the intensity of light passing through the polarization state adjusting component is minimized. According to claim 3,
The method,
When the actual GV value of the marking point exceeds the preset range, calculate the difference between the actual GV value and the standard GV value, and the rotation required to compensate for the difference based on the difference and the relationship curve between the configured rotation angle and the GV value. The automatic real-time GV value detection and compensation method further comprising determining an angle and rotating the movable polarizer at the rotation angle to match the laser energy incident on the marking point to the actual GV value. In the automatic real-time GV value detection and compensation system,
It includes an emission component, a marking component, an imaging component, a control component and a polarization state adjusting component, wherein the emission component, the polarization state adjustment component and the marking component are provided on a laser marking optical path, and wherein the imaging component is provided on a laser marking optical path. Components are provided on the GV value sensing optical path, and the emission component, marking component, imaging component, and polarization state adjusting component are each connected to a control component;
the emitting component is used for laser emission;
The marking component is used for marking products,
The imaging component is used for marking and at the same time acquiring an image of the marking point and transmitting it to the control component;
The control component analyzes the actual GV value of the marking point according to the marking point image, and when the actual GV value exceeds the preset range, determines the rotation angle to be adjusted according to the relationship curve between the configured rotation angle and the GV value. and used to output the rotation angle command to the polarization conditioning component;
The automatic real-time GV value, characterized in that the polarization state adjustment component rotates the angle according to the rotation angle command, and is used to match the laser energy incident to the marking point through the polarization state rotation component with the actual GV value. detection and compensation system. According to claim 7,
The automatic real-time GV value detection and compensation system, characterized in that the polarization state adjusting component consists of a movable polarizer and a stationary polarizer, wherein the movable polarizer is capable of rotating a preset angle relative to the stationary polarizer. According to claim 8,
A driving component is connected to the movable polarizer,
The automatic real-time GV value detection and compensation system, characterized in that the drive component is connected to the control component and used to rotate the movable polarizer by a preset angle under the control of the control component. According to claim 7,
The automatic real-time GV value detection and compensation system of claim 1 , wherein the system further comprises a return component used to direct the emitted laser to the marking component and direct the light reflected from the marking point to the imaging component.