阅读说明：本技术 一种激光切割机精度保持性的评估方法 (Method for evaluating precision retentivity of laser cutting machine ) 是由 吴智恒 梁澜之 毛璐瑶 施维 李智婷 李佳仪 于 2020-06-03 设计创作，主要内容包括：本发明涉及一种激光切割机精度保持性的评估方法,包括如下步骤：首先设计FPCB评估板,尺寸能够覆盖多个振镜加工区域,每个方形的振镜加工区域上设有相同的加工图形；其次校正激光切割机的加工精度；然后使用激光切割机对多张FPCB评估板进行加工,并采集每张FPCB评估板加工是的曲线及圆心坐标,最后将所获取的圆心坐标进行收集整理,计算三者与预设圆心坐标的偏差并做图,从而可以评估出激光切割机随时间变化的精度保持性。本发明操作简单,能在激光切割机精度校准后进行精度保持性的评估,且能及时发现激光切割机的设计、安装、人员操作、环境参数设置等环节是否有不当情况出现,避免激光切割机加工精度出现非预期下降的情况。(The invention relates to an evaluation method for precision retentivity of a laser cutting machine, which comprises the following steps: firstly, designing an FPCB evaluation board, wherein the size of the FPCB evaluation board can cover a plurality of galvanometer processing areas, and the same processing pattern is arranged on each square galvanometer processing area; secondly, correcting the processing precision of the laser cutting machine; and then, processing the plurality of FPCB evaluation plates by using a laser cutting machine, collecting the processed curve and the circle center coordinate of each FPCB evaluation plate, collecting and arranging the obtained circle center coordinate, calculating the deviation of the three and the preset circle center coordinate, and drawing, thereby evaluating the accuracy retentivity of the laser cutting machine along with the time change. The method is simple to operate, can evaluate the precision retentivity after the precision of the laser cutting machine is calibrated, can timely find whether the links such as design, installation, personnel operation, environmental parameter setting and the like of the laser cutting machine have improper conditions, and avoids the condition that the machining precision of the laser cutting machine is unexpectedly reduced.)

1. A method for evaluating the precision retentivity of a laser cutting machine is characterized by comprising the following steps: the method comprises the following steps:

designing an FPCB evaluation board, wherein the size of the FPCB evaluation board can cover a plurality of galvanometer processing areas, and the same processing pattern is arranged on each square galvanometer processing area;

step two, standardizing the environment of the calibration process, and operating to finish the precision calibration of the laser cutting machine;

after the precision calibration is finished, placing the FPCB evaluation board in the first step in a processing plane, processing all processing graphs on the FPCB evaluation board for one time by using a laser cutting machine, changing the first FPCB evaluation board after the processing is finished, and finding and recording the center coordinates of the processing curve by using an optical method;

step four, replacing a second FPCB evaluation board, repeatedly processing the processing graphs on the FPCB evaluation board for a plurality of times, and replacing the second FPCB evaluation board after the processing is finished;

replacing a third FPCB evaluation board, performing primary processing by using the graph in the first step, replacing the third FPCB evaluation board after the processing is finished, and finding and recording the center coordinates of the processing curve by using an optical method;

step six, replacing a fourth FPCB evaluation board, using the graph in the step one to perform repeated processing for many times, and replacing the fourth FPCB evaluation board after finishing processing;

step seven, replacing a fifth FPCB evaluation board, carrying out primary processing by using the graph in the step one, replacing the fifth FPCB evaluation board after the processing is finished, and finding and recording the center coordinates of the processing curve by using an optical method;

step eight, collecting and sorting the circle center coordinates obtained in the step three, the step five and the step seven, calculating the deviation between the three and the preset circle center coordinates, and drawing, wherein the preset circle center coordinates refer to the circle center coordinates of all circles in the FPCB evaluation board designed in the step one, so that the precision retentivity of the laser cutting machine along with the change of time is evaluated, and when the deviation value between the curve coordinates in the first, the third and the fifth FPCB evaluation boards and the preset circle center coordinates is increased, the precision retentivity is shown to be deteriorated along with the increase of time; if the deviation value is not obviously increased, the precision can be ensured under the condition of long-time processing.

2. The method of evaluating the accuracy retentivity of a laser cutter according to claim 1, characterized in that: the step two of performing the standardized operation of the calibration process environment includes:

starting up and preheating, wherein the preheating time must be set according to the regulations;

the situation that an operator touches the machining equipment in the calibration process is avoided;

the shielding shield needs to be closed when in operation;

the temperature of the workshop is ensured to be stabilized within a certain range.

3. The method of evaluating the accuracy retentivity of a laser cutter according to claim 1, characterized in that: the operation process of the precision calibration of the laser cutting machine in the second step is as follows: continuously placing a plurality of FPCB calibration plates in a processing plane of a laser cutting machine, wherein the size of one FPCB calibration plate is a galvanometer processing area; then operating the machine to position the FPCB calibration plate, performing a calibration procedure to ensure that the difference between the predicted value and the measured position of the drilling hole in one working area is minimized through compensation calculation, and after moving to the next working area, the difference of the measured position becomes the basis of the next compensation of the next working area again; and finally, opening software in the operating system of the laser cutting machine to perform automatic compensation.

4. The method of evaluating the accuracy retentivity of a laser cutter according to claim 1, characterized in that: the operation process of finding and recording the center coordinates of the machining curve by using an optical method comprises the following steps: and measuring by using an image, taking three points on the curve as vertical lines, recording the intersection points as the coordinates of the circle center of the curve, and recording the coordinates of the circle center.

5. The method of evaluating accuracy retentivity of a laser cutter according to any one of claims 1 to 4, characterized in that: the processing graph in the first step comprises a plurality of circular patterns in the galvanometer processing area, a semicircular pattern with the diameter on the side line of the galvanometer processing area and a quarter circular pattern with the center on the corner.

Technical Field

The invention relates to the field of reliability evaluation, in particular to a method for evaluating precision retentivity of a precision laser cutting machine.

Background

The precision laser cutting machine is a novel high-efficiency cutting device, realizes the cutting function by utilizing the heat energy of laser beams, and cuts the co-building into required shapes or patterns. The laser has the characteristics of good directivity, high brightness, good monochromaticity, high energy density and the like, and is widely applied to industrial processing. The laser cutting is that the energy released when the laser beam irradiates the surface of the workpiece is used for melting and evaporating the workpiece so as to achieve the purposes of cutting and carving.

In the precision manufacturing field, the laser cutting machine can guarantee the machining precision after the calibration usually, but through the processing of a period of time, its machining precision appears the gliding, can't guarantee the work piece and require the precision, need calibrate again, and it is hard and time-consuming, greatly reduced machining efficiency increases the processing cost. Therefore, it is necessary to perform accuracy retentivity evaluation, positioning of the laser processing equipment, and movement of components, unreasonable calibration, environment setting, parameter setting, etc., which cause accuracy degradation of the processing equipment, so as to ensure that the laser processing equipment does not suffer unexpected accuracy degradation during production processing. The traditional laser cutting machine uses an adaptive calibration plate or calibration plate, combines the compensation of software in an operating system, but only can ensure that the precision after calibration meets the requirement, but cannot check the precision maintenance state of the laser cutting machine during normal processing, and cannot help to determine whether the processing precision of the laser cutting machine is unexpectedly reduced due to improper conditions in the links of design, installation, personnel operation, environmental parameter setting and the like of the laser cutting machine.

Disclosure of Invention

The invention aims to provide a method for evaluating the precision retentivity of a precision laser cutting machine, which is simple to operate and can evaluate the precision retentivity after the precision of the laser cutting machine is calibrated.

In order to achieve the purpose, the invention adopts the technical scheme that: a method for evaluating the precision retentivity of a laser cutting machine is characterized by comprising the following steps: the method comprises the following steps:

designing an FPCB evaluation board, wherein the size of the FPCB evaluation board can cover a plurality of galvanometer processing areas, and the same processing pattern is arranged on each square galvanometer processing area;

step two, standardizing the environment of the calibration process, and operating to finish the precision calibration of the laser cutting machine;

after the precision calibration is finished, placing the FPCB evaluation board in the first step in a processing plane, processing all processing graphs on the FPCB evaluation board for one time by using a laser cutting machine, changing the first FPCB evaluation board after the processing is finished, and finding and recording the center coordinates of the processing curve by using an optical method;

step four, replacing a second FPCB evaluation board, repeatedly processing the processing graphs on the FPCB evaluation board for a plurality of times, and replacing the second FPCB evaluation board after the processing is finished;

replacing a third FPCB evaluation board, performing primary processing by using the graph in the first step, replacing the third FPCB evaluation board after the processing is finished, and finding and recording the center coordinates of the processing curve by using an optical method;

step six, replacing a fourth FPCB evaluation board, using the graph in the step one to perform repeated processing for many times, and replacing the fourth FPCB evaluation board after finishing processing;

step seven, replacing a fifth FPCB evaluation board, carrying out primary processing by using the graph in the step one, replacing the fifth FPCB evaluation board after the processing is finished, and finding and recording the center coordinates of the processing curve by using an optical method;

step eight, collecting and sorting the circle center coordinates obtained in the step three, the step five and the step seven, calculating the deviation between the three and the preset circle center coordinates, and drawing, wherein the preset circle center coordinates refer to the circle center coordinates of all circles in the FPCB evaluation board designed in the step one, so that the precision retentivity of the laser cutting machine along with the change of time is evaluated, and when the deviation value between the curve coordinates in the first, the third and the fifth FPCB evaluation boards and the preset circle center coordinates is increased, the precision retentivity is shown to be deteriorated along with the increase of time; if the deviation value is not obviously increased, the precision can be ensured under the condition of long-time processing.

Further, the step two of performing the operation of normalizing the process environment includes: (1) starting up and preheating, wherein the preheating time must be set according to the regulations; (2) the situation that an operator touches the machining equipment in the calibration process is avoided; (3) the shielding shield needs to be closed when in operation; (4) the temperature of the workshop is ensured to be stabilized within a certain range.

Further, the operation process of the precision calibration of the laser cutting machine in the second step is as follows: continuously placing a plurality of FPCB calibration plates in a processing plane of a laser cutting machine, wherein the size of one FPCB calibration plate is a galvanometer processing area; then operating the machine to position the FPCB calibration plate, performing a calibration procedure to ensure that the difference between the predicted value and the measured position of the drilling hole in one working area is minimized through compensation calculation, and after moving to the next working area, the difference of the measured position becomes the basis of the next compensation of the next working area again; and finally, opening software in the operating system of the laser cutting machine to perform automatic compensation.

Further, the operation process of finding and recording the center coordinates of the machining curve by using an optical method is as follows: and measuring by using an image, taking three points on the curve as vertical lines, recording the intersection points as the coordinates of the circle center of the curve, and recording the coordinates of the circle center.

Further, the processing pattern in the first step includes a plurality of circular patterns in the galvanometer processing area, a semicircular pattern with a diameter on a side line of the galvanometer processing area, and a quarter circular pattern with a center on a corner.

The invention has the beneficial effects that: the method is simple to operate, and can evaluate the precision retentivity after the precision of the laser cutting machine is calibrated, namely the precision retentivity state of the laser cutting machine during normal processing can be checked. Meanwhile, the standardized operation of the calibration environment can help to find and determine whether the links of design, installation, personnel operation, environment parameter setting and the like of the laser cutting machine have improper conditions. Therefore, timely correction can be performed on pertinence, and the situation that the machining precision of the laser cutting machine is unexpectedly reduced is avoided.

Drawings

Fig. 1 is a flowchart of the method for evaluating the accuracy retention of a laser cutting machine according to the present invention.

FIG. 2 is a schematic diagram of a processing pattern on a galvanometer processing area in accordance with the present invention.

FIG. 3 is a diagram illustrating the difference between the center coordinates of the first processed FPCB evaluation board curve (the corners of the processing area).

FIG. 4 is a diagram illustrating the difference between the center coordinates of the first processed FPCB according to the present invention (the middle of the side line of the processing area).

FIG. 5 is a view showing a coordinate difference (processing area corner) of the center of a curve of a third FPCB in accordance with the present invention

FIG. 6 is a diagram illustrating the coordinate difference of the center of a curve (the middle of the side line of the processing area) of the third FPCB in accordance with the present invention.

Detailed Description

The technical scheme of the invention is described in the following by combining the attached drawings of the invention.

The invention relates to an evaluation method for the precision retentivity of a laser cutting machine, which comprises the following steps:

step one, designing a FPCB assessment board, wherein the size of the FPCB assessment board can cover a plurality of galvanometer processing areas, and the same processing pattern is arranged on each square galvanometer processing area. Specifically, the processing pattern may be a pattern including a plurality of circular patterns in the galvanometer processing area, a semicircular pattern having a diameter on a side line of the galvanometer processing area, and a quarter-circle pattern having a center on a corner.

And step two, standardizing the environment of the calibration process, including the stable preheating time of the machine, the isolation of personnel and the machine and the stability of the temperature and the humidity of the environment. And the precision calibration of the laser cutting machine is completed by operation, and the calibrated precision is ensured to be within the precision error range manually.

And step three, after the precision calibration is finished, placing the FPCB evaluation board in the first step in a processing plane, processing all processing graphs on the FPCB evaluation board for one time by using a laser cutting machine, replacing the first FPCB evaluation board after the processing is finished, and finding and recording the center coordinates of the processing curve by using an optical method.

And step four, replacing the second FPCB evaluation board, repeatedly processing the processing graphs on the FPCB evaluation board for a plurality of times, and replacing the second FPCB evaluation board after the processing is finished. Therefore, repeated processing is carried out within a certain time by using the same pattern, the stress of the cutting machine in the testing stage can be guaranteed to be consistent, and the testing precision is guaranteed.

And fifthly, replacing a third FPCB evaluation board, performing primary processing by using the graph in the first step, replacing the third FPCB evaluation board after the processing is finished, and finding and recording the center coordinates of the processing curve by using an optical method.

And sixthly, replacing a fourth FPCB evaluation board, using the graph in the step one to repeatedly process for multiple times, and replacing the fourth FPCB evaluation board after finishing.

And step seven, replacing a fifth FPCB evaluation board, carrying out primary processing by using the graph in the step one, replacing the fifth FPCB evaluation board after the processing is finished, and finding and recording the center coordinates of the processing curve by using an optical method.

Step eight, collecting and sorting the circle center coordinates obtained in the step three, the step five and the step seven, calculating the deviation between the three and the preset circle center coordinates, and drawing, wherein the preset circle center coordinates refer to the circle center coordinates of all circles in the FPCB evaluation board designed in the step one, so that the precision retentivity of the laser cutting machine along with the change of time is evaluated, and when the deviation value between the curve coordinates in the first, the third and the fifth FPCB evaluation boards and the preset circle center coordinates is increased, the precision retentivity is shown to be deteriorated along with the increase of time; if the deviation value is not obviously increased, the precision can be ensured under the condition of long-time processing.

Preferably, the step two of performing the operation of normalizing the process environment includes: (1) starting up and preheating, wherein the preheating time must be set according to the regulations; (2) the situation that an operator touches the machining equipment in the calibration process is avoided; (3) the shielding shield needs to be closed when in operation; (4) the temperature of the workshop is ensured to be stabilized within a certain range.

The operation process of the precision calibration of the laser cutting machine in the second step is as follows: continuously placing a plurality of FPCB calibration plates in a processing plane of a laser cutting machine, wherein the size of one FPCB calibration plate is a galvanometer processing area; then operating the machine to position the FPCB calibration plate, performing a calibration procedure to ensure that the difference between the predicted value and the measured position of the drilling hole in one working area is minimized through compensation calculation, and after moving to the next working area, the difference of the measured position becomes the basis of the next compensation of the next working area again; and finally, opening software in the operating system of the laser cutting machine to perform automatic compensation.

Further, the operation process of finding and recording the center coordinates of the machining curve by using an optical method is as follows: and measuring by using an image, taking three points on the curve as vertical lines, recording the intersection points as the coordinates of the circle center of the curve, and recording the coordinates of the circle center.

The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the scope of the present invention, and those skilled in the art can make simple modifications or equivalent substitutions on the technical solutions of the present invention without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.