Curved surface screen printing control method and system and electronic equipment

Abstract

The invention provides a curved surface screen printing control method and system and electronic equipment. According to the technical scheme, the corresponding relation between the curved surface rotation angle and the curved surface arc length is obtained according to the pre-obtained corresponding relation between the curved surface rotation angle and the curved surface radius; according to the corresponding relation, the maximum height of the to-be-printed curved surface under different rotation angles is determined, the corresponding curved surface rotation angle is determined by restraining the maximum height value, and then the optimal contact angle of the silk screen and the to-be-printed curved surface is determined; determining the horizontal and vertical coordinates of the corresponding optimal contact point according to the optimal contact angle; according to the horizontal and vertical coordinates, determining a four-axis position relation based on a corresponding relation between a curved surface rotation angle and a curved surface arc length; according to the four-axis position relation, the difference value between the abscissa of the screen and the abscissa of the optimal contact point serves as a constant control quantity, four-axis movement is simulated to obtain a four-axis movement curve, and then four axes of the curved surface screen printing machine are controlled to conduct corresponding movement. According to the method and the device, the problems that the efficiency of an acquisition mode of an existing curved surface silk-screen printing control scheme is low and the printing quality of the obtained curved surface silk-screen printing control scheme is relatively low can be solved.

Description

Technical Field

[0001] The present invention belongs to the field of curved surface screen printing, and more specifically, relates to a curved surface screen printing control method, system and electronic equipment. Background Art

[0002] Generally, printing can only be done on a flat surface, but screen printing can not only be done on a flat surface but also on specially shaped objects such as spherical surfaces. Anything with a shape can be printed using screen printing.

[0003] The existing curved screen printing is mainly realized based on a four-axis curved screen printer. At present, after obtaining a substrate with a curved surface to be printed, it is necessary to first determine the optimal contact point between the screen and the substrate, and then debug the four-axis motion trajectory of the curved screen printer based on the optimal contact point to obtain the final printing control solution. However, the acquisition of the above curved screen printing control solution mainly relies on manual operation, which is not only time-consuming and labor-intensive, but also the printing quality cannot be guaranteed. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing method for acquiring a curved surface screen printing control solution is inefficient and the printing quality of the obtained curved surface screen printing control solution is low.

[0005] In order to achieve the above-mentioned object, the present invention provides a curved surface screen printing control method, system and electronic equipment.

[0006] According to a first aspect of the present invention, a curved screen printing control method is provided, which is used to realize screen printing on a curved surface of a bottle body, and the method comprises the following steps:

[0007] Get the corresponding relationship between the surface rotation angle and the surface radius;

[0008] According to the corresponding relationship between the rotation angle of the curved surface and the radius of the curved surface, the corresponding relationship between the rotation angle of the curved surface and the arc length of the curved surface is obtained;

[0009] According to the correspondence between the surface rotation angle and the surface radius, the maximum height of the surface to be printed at different rotation angles is determined, the corresponding surface rotation angle is determined by constraining the maximum height, and the surface rotation angle is used as the optimal contact angle between the screen and the surface to be printed;

[0010] Determine the horizontal coordinate and the vertical coordinate of the optimal contact point between the screen and the curved surface to be printed according to the optimal contact angle;

[0011] Determine the four-axis position relationship of the curved screen printer according to the horizontal coordinate and the vertical coordinate of the optimal contact point and based on the corresponding relationship between the curved surface rotation angle and the curved surface arc length;

[0012] According to the four-axis position relationship, the difference between the horizontal coordinate of the screen and the horizontal coordinate of the optimal contact point is used as a constant control quantity, and the four-axis motion of the curved screen printing machine is simulated to obtain a four-axis motion curve;

[0013] The four axes of the curved screen printing machine are controlled to perform corresponding movements according to the four-axis motion curves.

[0014] Optionally, the method for obtaining the corresponding relationship between the curved surface rotation angle and the curved surface radius includes:

[0015] Rotate the printed surface at the set sampling resolution;

[0016] During the process of the printed surface rotating one circle, the distance measuring sensor is controlled to scan the printed surface at the same frequency;

[0017] The data returned by the distance measuring sensor is filtered to obtain the corresponding relationship between the rotation angle of the curved surface and the radius of the curved surface.

[0018] Optionally, the distance measuring sensor is a laser displacement sensor.

[0019] Optionally, the corresponding relationship between the surface rotation angle and the surface arc length is obtained based on the following integral formula:

[0020]

[0021] In the above formula, s is the arc length of the surface, θ is the rotation angle of the surface, and r(θ) is the corresponding relationship between the rotation angle of the surface and the radius of the surface.

[0022] Optionally, the abscissa and ordinate of the optimal contact point between the screen and the curved surface to be printed are determined according to the optimal contact angle as follows:

[0023] According to the optimal contact angle, the abscissa and ordinate of the optimal contact point between the screen and the curved surface to be printed are determined by solving trigonometric functions.

[0024] According to a second aspect of the present invention, a curved screen printing control system is provided, the system comprising the following functional modules:

[0025] A first corresponding relationship acquisition module is used to acquire the corresponding relationship between the surface rotation angle and the surface radius;

[0026] A second corresponding relationship acquisition module, used to acquire the corresponding relationship between the surface rotation angle and the surface arc length according to the corresponding relationship between the surface rotation angle and the surface radius;

[0027] An optimal contact angle determination module is used to determine the maximum height of the to-be-printed curved surface at different rotation angles according to the corresponding relationship between the curved surface rotation angle and the curved surface radius, determine the corresponding curved surface rotation angle by constraining the maximum height, and use the curved surface rotation angle as the optimal contact angle between the screen and the to-be-printed curved surface;

[0028] An optimal contact point determination module, used to determine the abscissa and ordinate of the optimal contact point between the screen and the surface to be printed according to the optimal contact angle;

[0029] A four-axis position relationship determination module, used to determine the four-axis position relationship of the curved screen printing machine according to the horizontal coordinate and the vertical coordinate of the optimal contact point and based on the corresponding relationship between the curved surface rotation angle and the curved surface arc length;

[0030] A four-axis motion curve acquisition module is used to simulate the four-axis motion of the curved screen printing machine to obtain a four-axis motion curve by taking the difference between the horizontal coordinate of the screen and the horizontal coordinate of the optimal contact point as a constant control quantity according to the four-axis position relationship;

[0031] The four-axis driving module is used to control the four axes of the curved screen printing machine to perform corresponding movements according to the four-axis motion curves.

[0032] Optionally, the corresponding relationship between the surface rotation angle and the surface arc length is obtained based on the following integral formula:

[0033]

[0034] In the above formula, s is the arc length of the surface, θ is the rotation angle of the surface, and r(θ) is the corresponding relationship between the rotation angle of the surface and the radius of the surface.

[0035] Optionally, the abscissa and ordinate of the optimal contact point between the screen and the curved surface to be printed are determined according to the optimal contact angle as follows:

[0036] According to the optimal contact angle, the abscissa and ordinate of the optimal contact point between the screen and the curved surface to be printed are determined by solving trigonometric functions.

[0037] According to a third aspect of the present invention, there is provided an electronic device, the device comprising a processor and a memory, wherein the processor implements any one of the above-mentioned curved screen printing control methods when executing a computer program stored in the memory.

[0038] The beneficial effects of the present invention are:

[0039] The curved screen printing control method of the present invention comprises the following steps: first, obtaining the corresponding relationship between the curved surface rotation angle and the curved surface radius; second, obtaining the corresponding relationship between the curved surface rotation angle and the curved surface arc length according to the corresponding relationship between the curved surface rotation angle and the curved surface radius; third, determining the maximum height of the to-be-printed curved surface at different rotation angles according to the corresponding relationship between the curved surface rotation angle and the curved surface radius, determining the corresponding curved surface rotation angle by constraining the maximum height value, and using the curved surface rotation angle as the optimal contact angle between the screen and the to-be-printed curved surface; fourth, determining the maximum height of the to-be-printed curved surface at different rotation angles according to the corresponding relationship between the curved surface rotation angle and the curved surface radius, and using the optimal contact angle between the screen and the to-be-printed curved surface; and fifth, determining the maximum height of the to-be-printed curved surface at different rotation angles according to the optimal contact angle. The fifth step is to determine the horizontal and vertical coordinates of the best contact point between the screen and the surface to be printed according to the horizontal and vertical coordinates of the best contact point and the corresponding relationship between the surface rotation angle and the surface arc length of the curved surface. The sixth step is to simulate the four-axis motion of the curved screen printer according to the four-axis position relationship, taking the difference between the horizontal coordinate of the screen and the horizontal coordinate of the best contact point as a constant control quantity to obtain a four-axis motion curve. Finally, the four axes of the curved screen printer are controlled to perform corresponding movements according to the four-axis motion curve.

[0040] The curved screen printing control method of the present invention first obtains the bottle body curved surface data, that is, the corresponding relationship between the curved surface rotation angle and the curved surface radius, and then determines the relationship between the arc length of the bottle body and the contact point and the rotation angle through integration and constraint algorithms, and controls the displacement difference generated during the contact point and the screen movement process to control the movement of the upper and lower axes, the screen lateral movement axis, and the scraper lateral movement axis of the curved screen printer, so as to achieve a constant speed during the printing process, thereby ensuring the printing quality. At the same time, the curved screen printing control method of the present invention can be automatically implemented, which saves time and effort and is more efficient than the acquisition method of the existing curved screen printing control solution.

[0041] The curved screen printing control system and electronic device of the present invention belong to a general inventive concept as well as the curved screen printing control method described above, and have at least the same beneficial effects as the curved screen printing control method described above, and the beneficial effects will not be repeated here.

[0042] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present invention may be better understood by referring to the following description taken in conjunction with the accompanying drawings, in which the same or similar reference numerals are used throughout the drawings to represent the same or similar components.

[0044] Figure 1 A flowchart of a method for controlling curved screen printing according to an embodiment of the present invention is shown;

[0045] Figure 2A schematic diagram showing the structural relationship of four axes of a curved screen printing machine according to an embodiment of the present invention is shown;

[0046] Figure 3 A structural block diagram of a curved screen printing control system according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to more fully understand the technical solution of the present invention, the exemplary embodiments of the present invention will be described in more comprehensive and detailed in conjunction with the accompanying drawings below. Obviously, the one or more embodiments of the present invention described below are only one or more of the specific ways in which the technical solution of the present invention can be implemented, and are not exhaustive. It should be understood that other ways belonging to a general inventive concept can be used to implement the technical solution of the present invention, and should not be limited by the exemplary embodiments described. Based on one or more embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work should fall within the scope of protection of the present invention.

[0048] Example: Figure 1 The following is a flowchart showing the implementation of the curved screen printing control method according to an embodiment of the present invention. Figure 1 The curved screen printing control method of the embodiment of the present invention comprises the following steps:

[0049] Step S100, obtaining the corresponding relationship between the surface rotation angle and the surface radius;

[0050] Step S200, obtaining a corresponding relationship between the rotation angle of the curved surface and the arc length of the curved surface according to the corresponding relationship between the rotation angle of the curved surface and the radius of the curved surface;

[0051] Step S300, determining the maximum height of the to-be-printed curved surface at different rotation angles according to the correspondence between the curved surface rotation angle and the curved surface radius, determining the corresponding curved surface rotation angle by constraining the maximum height value, and using the curved surface rotation angle as the optimal contact angle between the screen and the to-be-printed curved surface;

[0052] Step S400, determining the abscissa and ordinate of the best contact point between the screen and the curved surface to be printed according to the best contact angle;

[0053] Step S500, determining the four-axis position relationship of the curved screen printer according to the horizontal coordinate and the vertical coordinate of the optimal contact point and based on the corresponding relationship between the curved surface rotation angle and the curved surface arc length;

[0054] Step S600, according to the four-axis position relationship, taking the difference between the horizontal coordinate of the screen and the horizontal coordinate of the optimal contact point as a constant control quantity, simulating the four-axis motion of the curved screen printing machine to obtain a four-axis motion curve;

[0055] Step S700: controlling the four axes of the curved screen printing machine to perform corresponding movements according to the four-axis motion curves.

[0056] Furthermore, in step S100 of the embodiment of the present invention, the method for obtaining the corresponding relationship between the curved surface rotation angle and the curved surface radius includes:

[0057] Rotate the printed surface at the set sampling resolution;

[0058] During the process of the printed surface rotating one circle, the distance measuring sensor is controlled to scan the printed surface at the same frequency;

[0059] The data returned by the distance measuring sensor is filtered to obtain the corresponding relationship between the rotation angle of the curved surface and the radius of the curved surface.

[0060] Furthermore, in an embodiment of the present invention, the distance measuring sensor is a laser displacement sensor.

[0061] Specifically, in an embodiment of the present invention, under the condition of setting the sampling resolution, the entire curved surface is rotated, the laser displacement sensor vertically illuminates the curved surface, and the data returned by the laser displacement sensor is saved. When the curved surface rotates 360 degrees, the bottle body measurement is completed. After filtering the data, a bottle body curved surface data table is obtained, that is, the correspondence between the curved surface rotation angle and the curved surface radius.

[0062] Furthermore, in step S200 of the embodiment of the present invention, the corresponding relationship between the surface rotation angle and the surface arc length is obtained based on the following integral formula:

[0063]

[0064] In the above formula, s is the arc length of the surface, θ is the rotation angle of the surface, and r(θ) is the corresponding relationship between the rotation angle of the surface and the radius of the surface.

[0065] Specifically, in an embodiment of the present invention, the integration method adopted is the integration of the surface radius over the surface rotation angle. Based on this method, the correspondence between the surface rotation angle and the surface arc length can be obtained, and this correspondence is the correspondence between the moving distance of the screen in contact with the surface and the surface rotation angle.

[0066] Furthermore, in step S400 of the embodiment of the present invention, the abscissa and ordinate of the optimal contact point between the screen and the surface to be printed are determined according to the optimal contact angle as follows:

[0067] According to the optimal contact angle, the abscissa and ordinate of the optimal contact point between the screen and the curved surface to be printed are determined by solving trigonometric functions.

[0068] Specifically, Figure 2 The schematic diagram of the four-axis structure relationship of the curved screen printing machine according to the embodiment of the present invention is shown. Figure 2 The four axes of the curved screen printer are the rotation axis, the up-down axis, the screen lateral axis and the scraper lateral axis. The rotation axis is also called the θ axis, the up-down axis is also called the Z axis, the screen lateral axis is also called the X2 axis, and the scraper lateral axis is also called the X axis. Among them, the displacement of the up-down axis is determined by ZL, that is, the longitudinal distance from the printing contact point to the rotation center; the displacement of the screen lateral axis is determined by XL, that is, the lateral distance from the printing contact point to the rotation center; the displacement of the scraper lateral axis is jointly determined by the lateral distance from the printing contact point to the rotation center and the distance from the printing contact point to the printing starting point. During the printing process, the linear velocity of the printing point is consistent with the linear velocity of the screen lateral axis.

[0069] The curved screen printing control method of the embodiment of the present invention obtains the complete curved surface data of the bottle body by rotating the curved surface bottle and scanning the entire bottle body with a laser rangefinder; obtains the optimal contact position between the screen and the bottle body by algorithm integral constraint processing of the data; and obtains the trajectory diagram of the movement of the other three axes except the rotation axis by analyzing the contact position. For the trajectory diagram of the four axes, the relative distance between the contact point and the screen is controlled to be constant, so as to control the constant speed during the printing process, thereby ensuring the integrity of the printed image.

[0070] The embodiment of the present invention sets an algorithm for measuring surface data for self-learning to complete curved screen printing. Compared with the existing design, the operation process is simpler, the accuracy is higher, and the cost is lower. Specifically: by setting the sampling frequency, the curved surface data of the bottle body can be directly sampled, and the arc length of the bottle body and the relationship between the contact point and the rotation angle can be judged through integration and constraint algorithms. The displacement difference generated during the movement of the contact point and the screen is controlled to control the movement of the other axes, so as to achieve a constant speed in the printing process and thus ensure the printing quality. At the same time, the above functions can be achieved by combining a laser ranging sensor with the control algorithm. The design is more reasonable and simple, and the system coordination is stronger and the cost is lower. The curved screen printing control method of the embodiment of the present invention greatly simplifies the preparation work caused by changing the type of bottle body. The 2-3 hours required for changing the model on the market can be shortened to less than 0.5 hours, and the operation is simpler, which greatly reduces the threshold for users.

[0071] Accordingly, based on the curved surface screen printing control method of the embodiment of the present invention, the embodiment of the present invention further proposes a curved surface screen printing control system.

[0072] Figure 3FIG. 1 is a block diagram showing a curved screen printing control system according to an embodiment of the present invention. Figure 3 The curved screen printing control system of the embodiment of the present invention includes the following functional modules:

[0073] A first corresponding relationship acquisition module is used to acquire the corresponding relationship between the surface rotation angle and the surface radius;

[0074] A second corresponding relationship acquisition module, used to acquire the corresponding relationship between the surface rotation angle and the surface arc length according to the corresponding relationship between the surface rotation angle and the surface radius;

[0075] An optimal contact angle determination module is used to determine the maximum height of the to-be-printed curved surface at different rotation angles according to the corresponding relationship between the curved surface rotation angle and the curved surface radius, determine the corresponding curved surface rotation angle by constraining the maximum height, and use the curved surface rotation angle as the optimal contact angle between the screen and the to-be-printed curved surface;

[0076] An optimal contact point determination module, used to determine the abscissa and ordinate of the optimal contact point between the screen and the surface to be printed according to the optimal contact angle;

[0077] A four-axis position relationship determination module, used to determine the four-axis position relationship of the curved screen printing machine according to the horizontal coordinate and the vertical coordinate of the optimal contact point and based on the corresponding relationship between the curved surface rotation angle and the curved surface arc length;

[0078] A four-axis motion curve acquisition module is used to simulate the four-axis motion of the curved screen printing machine to obtain a four-axis motion curve by taking the difference between the horizontal coordinate of the screen and the horizontal coordinate of the optimal contact point as a constant control quantity according to the four-axis position relationship;

[0079] The four-axis driving module is used to control the four axes of the curved screen printing machine to perform corresponding movements according to the four-axis motion curves.

[0080] Accordingly, based on the curved screen printing control method of the embodiment of the present invention, the embodiment of the present invention also proposes an electronic device, which includes a processor and a memory, and the processor implements the curved screen printing control method of the embodiment of the present invention when executing the computer program stored in the memory.

[0081] Although one or more embodiments of the present invention are described above, it should be known to those skilled in the art that the present invention can be implemented in any other form without departing from its subject matter and scope. Therefore, the embodiments described above are illustrative rather than restrictive, and many modifications and substitutions are obvious to those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A curved screen printing control method, characterized in that: include: Get the corresponding relationship between the surface rotation angle and the surface radius; According to the corresponding relationship between the rotation angle of the curved surface and the radius of the curved surface, the corresponding relationship between the rotation angle of the curved surface and the arc length of the curved surface is obtained; According to the correspondence between the surface rotation angle and the surface radius, the maximum height of the surface to be printed at different rotation angles is determined, the corresponding surface rotation angle is determined by constraining the maximum height, and the surface rotation angle is used as the optimal contact angle between the screen and the surface to be printed; Determine the horizontal coordinate and the vertical coordinate of the optimal contact point between the screen and the curved surface to be printed according to the optimal contact angle; Determine the four-axis position relationship of the curved screen printer according to the horizontal coordinate and the vertical coordinate of the optimal contact point and based on the corresponding relationship between the curved surface rotation angle and the curved surface arc length; According to the four-axis position relationship, the difference between the horizontal coordinate of the screen and the horizontal coordinate of the optimal contact point is used as a constant control quantity, and the four-axis motion of the curved screen printing machine is simulated to obtain a four-axis motion curve; The four axes of the curved screen printing machine are controlled to perform corresponding movements according to the four-axis motion curves.

2. The curved screen printing control method according to claim 1, characterized in that: The method for obtaining the corresponding relationship between the curved surface rotation angle and the curved surface radius includes: Rotate the printed surface at the set sampling resolution; During the process of the printed surface rotating one circle, the distance measuring sensor is controlled to scan the printed surface at the same frequency; The data returned by the distance measuring sensor is filtered to obtain the corresponding relationship between the rotation angle of the curved surface and the radius of the curved surface.

3. The curved surface screen printing control method according to claim 2, characterized in that: The distance measuring sensor is a laser displacement sensor.

4. The curved screen printing control method according to claim 1, characterized in that: The corresponding relationship between the surface rotation angle and the surface arc length is obtained based on the following integral formula: In the above formula, s is the arc length of the surface, θ is the rotation angle of the surface, and r(θ) is the corresponding relationship between the rotation angle of the surface and the radius of the surface.

5. The curved screen printing control method according to claim 1, characterized in that: The abscissa and ordinate of the optimal contact point between the screen and the surface to be printed are determined according to the optimal contact angle as follows: According to the optimal contact angle, the abscissa and ordinate of the optimal contact point between the screen and the curved surface to be printed are determined by solving trigonometric functions.

6. A curved screen printing control system, characterized in that: include: A first corresponding relationship acquisition module is used to acquire the corresponding relationship between the surface rotation angle and the surface radius; A second corresponding relationship acquisition module, used to acquire the corresponding relationship between the surface rotation angle and the surface arc length according to the corresponding relationship between the surface rotation angle and the surface radius; An optimal contact angle determination module is used to determine the maximum height of the to-be-printed curved surface at different rotation angles according to the corresponding relationship between the curved surface rotation angle and the curved surface radius, determine the corresponding curved surface rotation angle by constraining the maximum height, and use the curved surface rotation angle as the optimal contact angle between the screen and the to-be-printed curved surface; An optimal contact point determination module, used to determine the abscissa and ordinate of the optimal contact point between the screen and the surface to be printed according to the optimal contact angle; A four-axis position relationship determination module, used to determine the four-axis position relationship of the curved screen printing machine according to the horizontal coordinate and the vertical coordinate of the optimal contact point and based on the corresponding relationship between the curved surface rotation angle and the curved surface arc length; A four-axis motion curve acquisition module is used to simulate the four-axis motion of the curved screen printing machine to obtain a four-axis motion curve by taking the difference between the horizontal coordinate of the screen and the horizontal coordinate of the optimal contact point as a constant control quantity according to the four-axis position relationship; The four-axis driving module is used to control the four axes of the curved screen printing machine to perform corresponding movements according to the four-axis motion curves.

7. The curved screen printing control system according to claim 6, characterized in that: The corresponding relationship between the surface rotation angle and the surface arc length is obtained based on the following integral formula: In the above formula, s is the arc length of the surface, θ is the rotation angle of the surface, and r(θ) is the corresponding relationship between the rotation angle of the surface and the radius of the surface.

8. The curved screen printing control system according to claim 6, characterized in that: The abscissa and ordinate of the optimal contact point between the screen and the surface to be printed are determined according to the optimal contact angle as follows: According to the optimal contact angle, the abscissa and ordinate of the optimal contact point between the screen and the curved surface to be printed are determined by solving trigonometric functions.

9. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the processor implements the curved screen printing control method according to any one of claims 1 to 5 when executing the computer program stored in the memory.

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