CN119129615B

CN119129615B - Method for configuring coding position of workpiece

Info

Publication number: CN119129615B
Application number: CN202411118544.8A
Authority: CN
Inventors: 赵佳峰; 赵欣; 陈忠; 张艺
Original assignee: Tianjin Puda Software Technology Co Ltd
Current assignee: Tianjin Puda Software Technology Co Ltd
Priority date: 2024-08-15
Filing date: 2024-08-15
Publication date: 2025-09-19
Anticipated expiration: 2044-08-15
Also published as: CN119129615A

Abstract

The invention relates to a method for configuring a coding position of a workpiece, which comprises the following steps of configuring coding parameters according to coding requirements of clients, establishing a workpiece coordinate system, establishing a plate coordinate system if a plate workpiece is coded before plate cutting, analyzing a workpiece drawing, acquiring a coding frame area according to a coding display mode, calculating a coding area of a standard workpiece, calculating an optimal coding position of the standard workpiece in the coding area of the standard workpiece, and calculating the optimal coding position of the plate workpiece if the plate workpiece is coded before plate cutting.

Description

Method for configuring coding position of workpiece

Technical Field

The invention is oriented to the field of intelligent manufacturing, relates to a digital processing technology of workpiece coding, and provides a novel method for automatically and rapidly configuring a workpiece coding position.

Background

When the work piece is required to be traced back, the production line of the modern factory is an effective mode for coding and identifying the work piece by scanning. The coding process is performed before the plate is cut, and after the individual workpieces are sanded or leveled. The code content can be plain code, graphic code or both. The coding mode can be laser coding or ink-jet coding. In order to improve coding efficiency and reduce manual intervention, the method can be used for automatically configuring a relatively optimal coding position according to the pose and the size of each workpiece, and providing technical support for automatic coding through coding equipment.

Disclosure of Invention

The invention aims at the intelligent manufacturing field and provides a method for automatically and rapidly configuring a workpiece coding position. The technical scheme of the invention is as follows:

A method for configuring a workpiece coding position, comprising the steps of:

Step 1, configuring coding parameters according to coding requirements of clients;

Step 2, establishing a workpiece coordinate system;

Step 3, if the plate workpiece is coded before the plate is cut, a plate coordinate system is established;

step 4, analyzing a workpiece drawing;

step 5, acquiring a code frame printing area according to a code printing display mode;

step 6, calculating a code-bearable area of the standard workpiece, wherein the method comprises the following steps:

(1) According to the coding safety distance, the outer outline of the coding frame area is expanded outwards at equal distance to obtain a new area formed after the coding frame is expanded outwards;

(2) Calculating the radius R of a circumscribed circle of a new area formed after the code printing frame is expanded;

(3) The outer contours of the standard workpiece are contracted inwards at equal intervals, all the inner contours of the standard workpiece are expanded outwards at equal intervals, and the inward contraction and outward expansion distances are the radius R of the circumscribed circle obtained in the last step;

(4) Redundancy processing is carried out on the new outline of the standard workpiece after the outer outline is contracted and the new outline of the standard workpiece after the inner outline is expanded, so that a code-bearable area of the standard workpiece is obtained;

Step 7, calculating the optimal coding position of the standard workpiece in the coding region of the standard workpiece;

Step 8, if the plate workpiece is coded before the plate is cut, calculating the optimal coding position of the plate workpiece

(1) According to the coding sequence of the plate workpieces and the setting value of the coding machine in the preferential axial direction, sequencing all the plate workpieces needing to be configured with coding positions according to the positions;

(2) Circularly traversing the ordered plate workpiece list, executing the following steps (3) - (5), and configuring the optimal coding position for each plate workpiece in sequence;

(3) Calculating the rotation angle of the coding machine according to the rotation angle of the plate workpiece;

(4) If the rotation angle of the coding machine of the plate workpiece is in the rotatable range of the coding machine, indicating that the coding position configuration of the standard workpiece is suitable for the current plate workpiece, and calculating the coding position coordinates of the plate workpiece based on the plate coordinate system according to the coding position coordinates of the standard workpiece;

(5) If the rotation angle of the coding machine of the plate workpiece is not in the rotatable range of the coding machine, the coding position needs to be reconfigured for the current plate workpiece;

And 8, automatically coding the workpiece.

Further, in step 1, the coding parameters mainly include:

(1) The selectable items comprise graphic codes, plain codes, up-and-down typesetting of the graphic codes and the plain codes, and left-and-right typesetting of the graphic codes and the plain codes;

(2) Configuring the graphic code size, wherein the configuration items comprise graphic code length and graphic code width, and the graphic code length and the graphic code width are preferably used for attempting to configure the workpiece coding position by using the large graphic code size;

(3) Configuring the size of the plain code, wherein the configuration items comprise a plain code length and a plain code width, and preferentially attempting to configure the coding position of the workpiece by using the large plain code size;

(4) The method comprises the following steps of searching a starting point of a workpiece coding position, wherein selectable items comprise a center point, an upper left corner, a lower left corner, an upper right corner and a lower right corner;

(5) Configuring a coding safety distance;

(6) If coding is carried out on the plate workpiece before cutting the plate, configuring a rotatable range of a coding machine;

(7) If the plate workpiece is coded before the plate is cut, configuring coding sequence of each workpiece;

(8) If the plate workpiece is coded before the plate is cut, the preferential axial direction is configured.

Further, step 4, analyzing the workpiece drawing, including:

If the plate workpiece is coded before cutting, a nesting chart needs to be analyzed, a workpiece nesting filling chart including a standard workpiece, coordinates and rotation angles of the workpiece on the plate are generated, and the length and width of the nesting workpiece, the size type of the workpiece and the gravity center information are calculated;

if the plate workpiece is coded after the plate is cut, a single workpiece diagram needs to be analyzed, a standard workpiece filling diagram is generated, and the length and width of the workpiece, the size type of the workpiece and the gravity center information are calculated.

Further, in step 7, the mode of searching the best coding position from the "center point" of the standard workpiece is as follows:

(1) Calculating the coordinate of the center point of the minimum circumscribed rectangle of the standard workpiece;

(2) Setting an angle step length, namely drawing a ray at intervals of the angle step length from 0 DEG by taking a center point of a standard workpiece as a circle center;

(3) Acquiring intersection points of each ray and a code-ready area of a standard workpiece:

If the 'center point' of the standard workpiece is above or outside the new outer contour of the code-ready area of the standard workpiece, all intersection points of each ray and the new outer contour of the code-ready area of the standard workpiece are obtained;

If the 'center point' of the standard workpiece is on or in the new inner outline of the code-ready area of the standard workpiece, all intersection points of each ray and the new inner outline of the code-ready area of the standard workpiece are obtained;

(4) And calculating the distance between all the intersection points and the center point of the standard workpiece, and sequencing from small to large, wherein the intersection point with the smallest distance is the optimal coding position of the standard workpiece.

Further, in step 8, the method for calculating the rotation angle of the coding machine according to the rotation angle of the plate workpiece

The following are provided:

① Acquiring a rotatable range of a coding machine;

② If the rotatable range of the coding machine is-180 degrees, adjusting according to the rotation angle of the plate workpiece:

If the rotation angle range of the plate workpiece is 0-180 degrees and does not contain 180 degrees, the rotation angle of the coding machine is the rotation angle of the plate workpiece, namely the rotation angle range of 0-180 degrees;

If the rotation angle range of the plate workpiece is 180-360 degrees and 180 degrees are included, the rotation angle of the coding machine is obtained by subtracting 360 degrees from the rotation angle of the plate workpiece, namely the rotation angle is-180-0 degrees;

③ If the rotatable range of the coding machine is-90 degrees to 90 degrees, adjusting according to the rotation angle of the plate workpiece:

If the rotation angle range of the plate workpiece is 0-90 degrees and does not contain 90 degrees, the rotation angle of the coding machine is the rotation angle of the plate workpiece, namely the rotation angle range of 0-90 degrees;

if the rotation angle range of the plate workpiece is 90-270 degrees and 270 degrees are not included, subtracting 180 degrees from the rotation angle of the plate workpiece, namely-90 degrees;

If the rotation angle range of the plate workpiece is 270-360 degrees and 270 degrees are included, the rotation angle of the coding machine is the rotation angle of the plate workpiece minus 360 degrees, namely the rotation angle is minus 90-0 degrees.

Further, in step 8, a method for calculating the coding position coordinates of the plate workpiece based on the plate coordinate system

The method is as follows:

① Obtaining coding position coordinates of a standard workpiece;

② Calculating coordinates of coding positions when the standard workpiece rotates around the gravity center by a specified angle, namely the coding machine rotation angle of the plate workpiece is overlapped with the gravity center of the plate workpiece;

③ Acquiring the barycenter coordinates of the plate workpiece based on a plate coordinate system;

④ When the center of gravity of the standard workpiece is calculated to be coincident with the center of gravity of the plate workpiece, the coding position is based on the coordinates of the plate coordinate system.

Further, in the case of requiring a spray assembly line on the board, in the processing of the step (4) and the step (5) in the step 8, it is necessary to increase the judgment of whether the coding position intersects with the assembly line, and if so, it is necessary to find a new position again.

Drawings

FIG. 1 is a diagram of an example of a graphic code;

FIG. 2 illustrates an example diagram;

FIG. 3 is a diagram of an example of an up-down layout of graphic codes and plain codes;

FIG. 4 is a diagram of an example left-right typesetting of graphic codes and plain codes;

FIG. 5 is a diagram of an example of the size of a graphic code;

FIG. 6 illustrates an example of a size of a code;

FIG. 7 is a diagram illustrating an example of a starting point for finding a workpiece coding position;

FIG. 8 is an exemplary diagram of a workpiece coordinate system;

FIG. 9 is an exemplary diagram of a sheet coordinate system;

FIG. 10 is a diagram of an example of a framed area with a top-bottom typeset of graphic codes and plain codes;

FIG. 11 is a diagram of an example of a framed area of a left-right typeset of graphic codes and plain codes;

FIG. 12 is a diagram of an example of a new region formed after frame expansion;

FIG. 13 is a graph illustrating the radius of the circumscribed circle of the new region formed after the expansion of the code frame;

FIG. 14 is a diagram of an exemplary new profile after the standard workpiece profile is scaled in and out;

FIG. 15 is a diagram of an example after a new profile redundancy process after a standard workpiece profile is scaled in and out;

FIG. 16 is a diagram of an exemplary center point of a master workpiece;

FIG. 17 illustrates an example of all intersections of rays with redundant processed outer contours

FIG. 18 illustrates an example of all intersections of rays with redundant processed inner contours

FIG. 19 is an example of an optimal code location for a standard workpiece

FIG. 20 is an exemplary diagram of automatic coding of a sheet workpiece

Detailed Description

The invention will be described with reference to examples.

1. Configuring coding parameters

And configuring coding parameters according to coding requirements of clients. The coding parameters mainly comprise:

(1) And (5) coding display mode. As shown in figures 1-4, the selectable items comprise graphic codes, plain codes, up-and-down typesetting of the graphic codes and the plain codes, and left-and-right typesetting of the graphic codes and the plain codes.

(2) Graphic code size. As shown in fig. 5, the configuration items include a graphic code length and a graphic code width. The large, medium and small graphic code sizes can be configured according to the requirements, and the workpiece coding position is preferably configured by using the large graphic code size.

(3) The size of the plain code. As shown in fig. 6, the configuration items include a plaintext length and a plaintext width. The large, medium and small size can be configured according to the requirement, and the workpiece coding position is configured by preferentially attempting to use the large size.

(4) Searching for a starting point of a coding position of the workpiece. The alternatives shown in fig. 7 include a center point (most commonly used), an upper left corner, a lower left corner, an upper right corner, and a lower right corner.

(5) Coding a safe distance. And allowing the minimum distance between the outer contour of the code printing frame and the inner contour and the outer contour of the workpiece. The proper coding safety distance can be configured according to the mechanical precision.

(6) The encoder can rotate the range. The parameter is only suitable for coding scenes of the plate workpiece before plate cutting.

(7) Coding sequence. The parameter is only suitable for coding scenes of the plate workpiece before plate cutting. The selectable items include top to bottom and left to right, left to right and top to bottom, bottom to top and left to right, left to right and bottom to top, right to left and top to bottom, right to left and bottom to top, finding the next nearest workpiece, Y-direction increment.

(8) Preferably axial. The parameter is only suitable for coding scenes of the plate workpiece before plate cutting. The X-axis and Y-axis of the coding machine have very different moving speeds, and in order to improve coding efficiency, the coding machine moves along the axial direction with high moving speed as much as possible. The selectable items include none, preferential X-axis parallel movement coding and preferential Y-axis parallel movement coding.

2. And establishing a workpiece coordinate system. The workpiece coordinate system takes the lower left corner of the minimum circumscribed rectangle of the workpiece as an original point, the horizontal right direction is the X-axis forward direction, and the vertical upward direction is the Y-axis forward direction.

An example of a workpiece coordinate system is shown in fig. 8.

3. And establishing a plate coordinate system. The plate coordinate system takes the lower left corner of the plate as an origin, the horizontal right direction is the X-axis forward direction, and the vertical upward direction is the Y-axis forward direction.

An example of a plate coordinate system is shown in fig. 9.

4. Analyzing workpiece drawing

Analyzing the workpiece drawing is the basis for configuring the coding position of the workpiece.

For the scene of coding before cutting the plate, the overprinting graph needs to be analyzed. The analysis result can generate a workpiece jacking filling map, coordinates and rotation angles of the workpiece on the plate (if the workpiece jacking map is analyzed), and information such as the length and width of the workpiece jacking, the size type of the workpiece, the gravity center and the like is calculated.

For the scenario where the coding is performed after the workpiece is sanded or leveled, it is necessary to resolve a single workpiece map. And the analysis result can generate a standard workpiece filling diagram, and calculate the length and width of the workpiece, the size type and the gravity center of the workpiece and other information.

The workpiece sleeve filling pattern and the workpiece filling pattern are black backgrounds, and the surface of the workpiece is filled with white.

The drawing parsing algorithm is complex and is not described in this document. See patent CN202310276738.X for an analytical method for a sheet-like workpiece nesting drawing.

5. And acquiring a code frame printing area.

(1) If the code display mode is the graphic code, the rectangular area framed by the length and the width of the graphic code is taken as the code frame area.

(2) If the coding display mode is 'clear', the rectangular area framed by 'clear length and width' is taken as 'coding frame area'.

(3) If the code printing display mode is the pattern code and the plain code up-and-down typesetting, the rectangular area framed by the pattern code length and width and the rectangular area framed by the plain code length and width are subjected to up-and-down seamless connection and left alignment to form a new area which is used as the code printing frame area. As shown in fig. 10.

(4) If the coding display mode is the typesetting of the graphic code and the plain code left and right, the rectangular area framed by the length and the width of the graphic code and the rectangular area framed by the length and the width of the plain code are subjected to left and right seamless connection and top alignment to form a new area which is used as the coding frame area. As shown in fig. 11.

6. And (3) expanding the outer outline of the code frame region equidistantly, wherein the expansion distance is the code safety distance, and a new region formed after the code frame is expanded is obtained. As shown in fig. 12.

7. And calculating the radius R of the circumscribed circle of the new area formed after the code frame is expanded. As shown in fig. 13.

8. The outer contours of the standard workpiece are contracted inwards at equal intervals, and then all the inner contours of the standard workpiece are expanded outwards at equal intervals, wherein the inward contraction and outward expansion distances are the circumscribed circle radius R obtained in the last step. As shown in fig. 14.

9. And carrying out redundancy treatment on the new profile after the outer profile of the standard workpiece is contracted and the inner profile is expanded, wherein the steps are as follows:

and removing all redundant contours except the new contour after the outer contour is retracted.

And removing all redundant contours inside the new contour after the inner contour is expanded.

According to practical experience, the workpiece size is far larger than the code frame size, and the method for calculating the code-bearable area of the standard workpiece is improved in order to save calculation time. Firstly, the code frame is subjected to outward expansion according to the code safety distance, the circumcircle radius R of a new area formed after the code frame is subjected to outward expansion is calculated, all contours of a standard workpiece are subjected to equidistant outward expansion or inward contraction distance according to the circumcircle radius R, and then the new contours formed after the inward contraction and outward expansion are subjected to redundancy treatment. As shown in fig. 15.

10. And calculating the optimal coding position of the standard workpiece.

Taking the case of searching the optimal coding position from the center point of the standard workpiece, other implementations of searching the starting point of the coding position of the workpiece are similar, and the center point in the following steps is replaced by the upper left corner, the lower left corner, the upper right corner or the lower right corner. The method comprises the following specific steps:

(1) The standard workpiece "center point" coordinates are calculated. The "center point" of the standard workpiece is the intersection of the minimum bounding rectangle diagonals of the standard workpiece. As shown in fig. 16.

(2) Setting the angle step length to be 10 degrees, taking the center point of a standard workpiece as the center of a circle, and drawing a ray every 10 degrees from 0 degrees clockwise, wherein 36 rays are drawn in total.

(3) And acquiring the intersection points of the 36 rays and the redundant processed outer contour or inner contour.

① If the standard workpiece "center point" is on or off the redundant "outer contour", all the intersections of the 36 rays with the redundant "outer contour" are taken. If no intersection point exists, the best coding position of the standard workpiece is not found. As shown in fig. 17.

② If the standard workpiece "center point" is on or within the redundant "inner contour," all the intersections of the 36 rays with the redundant "inner contour" are taken. If no intersection point exists, the best coding position of the standard workpiece is not found. As shown in fig. 18.

(4) And calculating the distance between all the intersection points and the center point of the standard workpiece, and sequencing from small to large, wherein the intersection point with the smallest distance is the optimal coding position of the standard workpiece. As shown in fig. 19.

11. Calculating the optimal coding position of the plate workpiece

(1) And sorting all the plate workpieces needing to be configured with the coding positions according to the coding sequence of the plate workpieces and the setting value of the coding machine in the preferential axial direction.

(2) And circularly traversing the ordered plate workpiece list, and carrying out the following steps to configure the optimal coding position for each plate workpiece in turn.

(3) And calculating the rotation angle of the coding machine according to the rotation angle of the plate workpiece.

① A rotatable range of the code printer is acquired.

If the rotation angle range of the plate workpiece is 0-180 degrees and does not contain 180 degrees, the rotation angle of the coding machine is the rotation angle of the plate workpiece, namely, the rotation angle range of 0-180 degrees.

If the rotation angle range of the plate workpiece is 180-360 degrees and 180 degrees are included, the rotation angle of the coding machine is the rotation angle of the plate workpiece minus 360 degrees, namely the rotation angle is minus 180-0 degrees.

If the rotation angle range of the plate workpiece is 0-90 degrees and does not contain 90 degrees, the rotation angle of the coding machine is the rotation angle of the plate workpiece, namely, the rotation angle range of 0-90 degrees.

If the rotation angle range of the plate workpiece is 90-270 degrees and 270 degrees are not included, the rotation angle of the coding machine is 180 degrees subtracted from the rotation angle of the plate workpiece, namely the rotation angle is-90 degrees.

(4) If the rotation angle of the coding machine of the plate workpiece is within the rotatable range of the coding machine, the coding position configuration of the standard workpiece is indicated to be suitable for the current plate workpiece. According to the coding position coordinates of the standard workpiece, calculating the coding position coordinates of the plate workpiece based on the plate coordinate system:

① And obtaining the coding position coordinates of the standard workpiece.

② And calculating coordinates of the coding position when the standard workpiece rotates around the gravity center by a specified angle (namely the coding machine rotation angle of the plate workpiece) and the gravity center of the plate workpiece is overlapped.

③ And acquiring the barycenter coordinates of the plate workpiece based on the plate coordinate system.

(5) If the plaiting machine rotation angle of the sheet workpiece is not within the rotatable range of the plaiting machine, the plaiting position needs to be reconfigured for the current sheet workpiece.

(6) In the case where the spray assembly line is required on the sheet material, in the above processing in the steps (4) and (5), judgment as to whether the coding position intersects the assembly line is added. If so, a new location needs to be found again.

12. Automatic coding of workpieces

And generating a template file of the outline of the single workpiece according to the drawing analysis result, and identifying the workpiece according to the workpiece template by machine vision. And the manipulator provided with the coding head codes the workpiece according to the optimal coding position coordinates of the workpiece. As shown in fig. 20.

Claims

1. A method for configuring a workpiece coding position, comprising the following steps:

Step 1: Configure the coding parameters according to the customer's coding requirements;

Step 2, establish the workpiece coordinate system;

Step 3: If the sheet workpiece is coded before cutting, establish the sheet coordinate system;

Step 4, parsing the workpiece drawing;

Step 5: Get the coding frame area according to the coding display mode;

Step 6: Calculate the printable area of the standard workpiece as follows:

(1) According to the coding safety distance, the outer contour of the coding frame area is expanded at equal distances to obtain a new area formed by the expansion of the coding frame;

(2) Calculate the radius R of the circumscribed circle of the new area formed after the coding frame is expanded;

(3) The outer contour of the standard workpiece is retracted at equal distances; all the inner contours of the standard workpiece are expanded at equal distances, and the retraction and expansion distances are both the circumscribed circle radius R obtained in the previous step;

(4) Redundant processing is performed on the new contour after the outer contour of the standard workpiece is shrunk inward and the new contour after the inner contour is expanded outward to obtain the coding area of the standard workpiece;

Step 7: Find the best coding position starting from the center point of the standard workpiece within the coding area of the standard workpiece. The specific steps are as follows:

(1) Calculate the coordinates of the “center point” of the minimum circumscribed rectangle of the standard workpiece;

(2) Set the angle step, take the "center point" of the standard workpiece as the center of the circle, start from 0°, and draw a ray every angle step;

(3) Obtain the intersection of each ray and the coding area of the standard workpiece:

If the "center point" of the standard workpiece is above or outside the outer contour of the codeable area of the standard workpiece, all intersection points of each ray with the new outer contour of the codeable area of the standard workpiece are obtained; if there is no intersection point, it means that the optimal coding position of the standard workpiece has not been found;

If the "center point" of the standard workpiece is above or within the inner contour of the codeable area of the standard workpiece, all intersections of each ray and the new inner contour of the codeable area of the standard workpiece are obtained; if there is no intersection, it means that the optimal coding position of the standard workpiece has not been found;

(4) Calculate the distance between all intersection points and the “center point” of the standard workpiece and sort them from small to large. The intersection point with the smallest distance is the best coding position for the standard workpiece;

Step 8: If the sheet metal workpiece is coded before cutting, calculate the optimal coding position for the sheet metal workpiece as follows:

(1) According to the "coding order" of the plate workpiece and the "priority axis" setting value of the coding machine, all the plate workpieces that need to be configured with coding positions are sorted by position;

(2) Loop through the sorted sheet workpiece list and execute the following steps (3)-(5) to configure the best coding position for each sheet workpiece in turn;

(3) Calculate the rotation angle of the coding machine according to the rotation angle of the plate workpiece;

(4) If the rotation angle of the coding machine of the plate workpiece is within the rotation range of the coding machine, it means that the coding position configuration of the standard workpiece is applicable to the current plate workpiece. According to the coding position coordinates of the standard workpiece, the coding position coordinates of the plate workpiece based on the plate coordinate system are calculated;

(5) If the rotation angle of the coding machine of the plate workpiece is not within the rotation range of the coding machine, it is necessary to reconfigure the coding position for the current plate workpiece;

Step 9: Automatically code the workpiece.

2. The method for configuring the coding position of a workpiece according to claim 1, wherein in step 1, the coding parameters mainly include:

(1) Select the code display mode: the options include: graphic code, plain code, graphic code and plain code arranged top to bottom, graphic code and plain code arranged left to right;

(2) Configure the graphic code size: Configuration items include: graphic code length, graphic code width;

(3) Configure the size of the plain code: Configuration items include: plain code length and plain code width;

(4) Find the starting point of the workpiece coding position: the options include: center point, upper left corner, lower left corner, upper right corner, lower right corner;

(5) Configure the coding safety distance;

(6) If the sheet metal workpiece is to be coded before cutting, the coding machine should be configured with a rotation range;

(7) If the sheet metal workpieces are coded before cutting, configure the coding order for each workpiece;

(8) If the sheet metal workpiece is coded before cutting, the axial direction shall be given priority.

3. The method for configuring a workpiece coding position according to claim 1, wherein step 4 of parsing the workpiece drawing comprises:

If the sheet metal workpiece is to be coded before cutting, it is necessary to analyze the nesting diagram, generate the workpiece nesting filling diagram including the standard workpiece, the coordinates and rotation angle of the workpiece on the sheet metal, and calculate the length and width of the nested workpiece, the size type and center of gravity information of the workpiece;

If the sheet metal workpiece is to be coded after cutting, it is necessary to parse the single workpiece image, generate a standard workpiece filling image, and calculate the length and width of the workpiece, the size type and center of gravity information of the workpiece.

4. The method for configuring a workpiece coding position according to claim 1, wherein in step 8 (3), the method for calculating the rotation angle of the coding machine according to the rotation angle of the plate workpiece is as follows:

1) Obtain the rotation range of the coding machine;

2) If the rotation range of the coding machine is -180°~180°, make adjustments based on the rotation angle of the plate workpiece:

If the rotation angle range of the plate workpiece is 0~180°, excluding 180°, the rotation angle of the coding machine is the rotation angle of the plate workpiece, that is, the range of 0°~180°;

If the rotation angle range of the plate workpiece is 180~360°, including 180°, the rotation angle of the coding machine is the rotation angle of the plate workpiece minus 360°, that is, the range of -180°~0°;

3) If the printer's rotation range is -90° to 90°, adjust it according to the rotation angle of the workpiece:

If the rotation angle range of the plate workpiece is 0~90°, excluding 90°, the rotation angle of the coding machine is the rotation angle of the plate workpiece, that is, the range of 0°~90°;

If the rotation angle range of the plate workpiece is 90°~270°, excluding 270°, the rotation angle of the coding machine is the rotation angle of the plate workpiece minus 180°, that is, the range of -90°~90°;

If the rotation angle range of the plate workpiece is 270°~360°, including 270°, the rotation angle of the coding machine is the rotation angle of the plate workpiece minus 360°, that is, the range of -90°~0°.

5. The method for configuring the coding position of a workpiece according to claim 1, wherein in step 8 (4), the method for calculating the coding position coordinates of the plate workpiece based on the plate coordinate system is as follows:

1) Obtain the coding position coordinates of the standard workpiece;

2) Calculate the coordinates of the coding position when the standard workpiece rotates around the center of gravity by a specified angle, that is, the rotation angle of the coding machine of the plate workpiece coincides with the center of gravity of the plate workpiece;

3) Obtain the coordinates of the center of gravity of the plate workpiece based on the plate coordinate system;

4) When the center of gravity of the standard workpiece is calculated to coincide with the center of gravity of the plate workpiece, the coding position is based on the coordinates of the plate coordinate system.

6. The method for configuring the coding position of a workpiece according to claim 1 is characterized in that, in the case where a spray assembly line is required on the plate, in the processing of steps (4) and (5) of step 8, it is necessary to add a judgment on whether the coding position intersects with the assembly line; if so, a new position needs to be found again.