Calculation method and calculation system for gravure ink cell volume carving

Abstract

The invention relates to a calculation method and system for gravure ink cell volume carving, and the method specifically comprises the steps: S1, firstly delineating the contour of an ink cell, dispersing the contour into a plurality of contour points, and enabling the distance between the adjacent contour points to be within a first preset range; s2, establishing a coordinate system at the center of the contour, and measuring coordinates of contour points by using an automatic measurement camera according to an original point of the coordinate system; s3, dividing the contour into a plurality of areas in a second preset range; s4, according to the coordinate fitting equation of the contour points in the same region, the area of the region is obtained through integration, and the volume in the region is obtained according to the depth; and S5, accumulating the volumes of different areas of the ink cell to finally obtain the volume of the ink cell, and the system adopts the method. The ink cell pattern is irregular, the contour is discretized into a plurality of contour points, so that an equation is fitted for integral operation, the area is firstly calculated, the volume is finally calculated, and the calculation is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of gravure cell volume calculation, and in particular to a calculation method and a calculation system for gravure cell volume engraving. Background Art

[0002] An electronic engraving machine is a high-precision CNC machine primarily used for producing gravure printing plates. Using an electronic control system and mechanical actuators, it carves tiny cells onto the surface of a copper roller. These cells store ink and transfer it to the substrate through pressure. The amount of ink transferred is a key factor affecting print quality. This depends on the size of the engraved cells, which is governed by factors such as engraving process parameters, screen ruling, cell angle, and needle angle. Currently, cell engraving is primarily based on screen value engraving, which maintains a fixed value during the engraving process.

[0003] Patent publication number CN111016476A discloses a method for predicting ink usage for a solid gravure pillow-shaped cell structure. The method first sets the pillow-shaped shape of the printed dots and the size of the exposed dots, and calculates the dot area ratio. During etching, the reserved size of the exposed dots increased due to corrosion is calculated based on the cell depth and the corrosion ratio of the cell wall sidewalls, and the actual size of the exposed dots is determined. The etched cells are then chrome-plated, and the dot area ratio of the chrome-plated cells is calculated. This patent does not accurately calculate the depth and volume of each cell.

[0004] Therefore, providing a calculation method that can accurately calculate the depth and volume of each cell is an issue that needs to be solved urgently. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a method and system for calculating the volume of intaglio cell engraving.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to one aspect of the present invention, a method for calculating the volume of intaglio cell engraving is provided, the method specifically comprising:

[0008] S1. First, outline the cell contour and discretize the contour into a plurality of contour points, with adjacent contour points being spaced within a first preset range;

[0009] S2. Establish a coordinate system at the center of the contour, and use an automatic measurement camera to measure the coordinates of the contour points based on the origin of the coordinate system;

[0010] S3, dividing the outline into multiple areas within a second preset range;

[0011] S4. Fitting the coordinates of the contour points in the same area into an equation, integrating to calculate the area of the area, and calculating the volume of the area based on the depth;

[0012] S5. Add the volumes of different areas of the cell to finally obtain the cell volume.

[0013] As a preferred technical solution, the equation adopts polynomial fitting, and the formula is as follows:

[0014] ya n x n +a n-1 x n-1 +…+a1x+a0

[0015] n is the degree of the polynomial, a n is the coefficient, x is the horizontal coordinate of the contour point, and y is the fitting equation of the contour in the area.

[0016] As a preferred technical solution, the least squares method is used to construct the error square sum function for the coordinates of the contour points and determine the coefficient a of the polynomial by taking its partial derivative. n .

[0017] As a preferred technical solution, the cell outline is a symmetrical figure.

[0018] As a preferred technical solution, the first preset range is smaller than the second preset range.

[0019] As a preferred technical solution, the first preset range is 1 mm, and the second preset range is 10 mm.

[0020] As a preferred technical solution, the difference between the vertical coordinates of the outermost contour points is equal to a second preset range value.

[0021] As a preferred technical solution, the area S is represented by the following formula:

[0022]

[0023] c is the ordinate of the starting point of the region, b is the ordinate of the end point of the region, x is the abscissa of the contour point, and y is the fitting equation of the contour in the region.

[0024] As a preferred technical solution, the magnifying glass of the automatic measurement camera is of M10 / 0.25 specification.

[0025] According to another aspect of the present invention, there is provided an engraving system for engraving the volume of intaglio cells as described above, comprising a host, a PCI_E serial port card, a signal controller, a bus terminal, a contact memory, and an engraving head, wherein the host, PCI_E serial port card, signal controller, bus terminal, contact memory, and engraving head are connected in sequence, the host is communicatively connected to an automatic measurement camera, the contact memory stores parameters of the cell profile, and the host transmits control signals in sequence through the PCI_E serial port card, signal controller, bus terminal, and contact memory to control the engraving head to engrave the cells.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The cell pattern of the present invention is irregular. By discretizing the contour into multiple contour points, an equation is fitted and integrated. The area is calculated first and the volume is finally calculated, which makes the calculation more accurate.

[0028] 2. The cell division area of the present invention can be adjusted to divide the curve into several line segments. The smaller the area division, the less affected by the irregular curve, so the calculation result is more accurate.

[0029] 3. In the present invention, the difference between the ordinates of the outermost contour points in the same region is equal to the second preset range value, indicating that the fitted equation can better represent the curve and the calculation result is more accurate.

[0030] 4. The more discrete contour points there are in the present invention, the smaller the distance between adjacent contour points is, and the more coordinates are used in equation fitting, which better represents the overall situation of the curve and makes the calculation more accurate.

[0031] 5. The present invention newly incorporates a PCI-E serial port card, a signal controller, a bus terminal, a contact memory, an engraving head, and an automatic measuring camera. The volume of each cell is first calculated, and then the engraving head is controlled to perform engraving, thereby precisely controlling the volume of each cell to ensure that the ink content between cells remains consistent.

[0032] 6. The present invention is provided with a contact memory for storing various parameters when calculating cells, and performs data interaction through physical contact to ensure the security and reliability of data.

[0033] 7. The PCI-E serial port card of the present invention provides a high-speed data transmission channel to ensure real-time transmission of engraving data; the signal controller is responsible for receiving engraving instructions from the computer and converting them into control signals to control the movement trajectory, engraving depth and speed of the engraving head; the signal controller acts as a relay node for signal transmission to ensure stable transmission of signals throughout the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1It is a schematic diagram of the process of the present invention;

[0035] Figure 2 This is a rendering of the recognition process of the present invention;

[0036] Figure 3 Schematic diagram of the system workflow of the present invention;

[0037] Figure 4 Schematic diagram of the connection of the camera interface of the present invention. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0039] "Cells" refer to tiny depressions on the surface of a printing plate. These recesses store ink, which is then transferred to the substrate during printing, forming images or text. The depth and shape of the cells affect the printing quality. Currently, cell engraving primarily relies on screen value engraving, where the value remains fixed during the engraving process. These cells are typically circular and monotonous, making it difficult to achieve complex dot structures. Controlling cell depth is also challenging, leading to uneven depth in actual engraving.

[0040] To address the above issues, the present invention provides a method and system for calculating the volume of intaglio cell engraving. The cell pattern of the present invention is irregular. By discretizing the contour into multiple contour points, an equation is fitted and integrated, first calculating the area and ultimately the volume, resulting in more accurate calculations. The cell division area of the present invention can be adjusted, dividing the curve into several line segments. The smaller the area division, the less affected by the irregular curve, resulting in more accurate calculation results. The difference between the ordinates of the outermost contour points within the same area of the present invention is equal to a second preset range value, indicating that the fitted equation better represents the curve and the calculation result is more accurate. The more discrete contour points of the present invention and the smaller the spacing between adjacent contour points, the more coordinates are used in the equation fitting, which better represents the overall situation of the curve and achieves more accurate calculations. The present invention adds a PCI-E serial port card, a signal controller, a bus terminal, a contact memory, an engraving head, and an automatic measurement camera. The cell volume is first calculated, and then the engraving head is controlled to perform engraving, precisely controlling the cell volume to ensure consistent ink content between cells. The present invention incorporates a contact memory to store various parameters used for cell calculations, enabling data exchange through physical contact, ensuring data security and reliability. The PCI-E serial port card provides a high-speed data transmission channel, ensuring real-time transmission of engraving data. The signal controller receives engraving instructions from the computer and converts them into control signals, controlling the engraving head's trajectory, engraving depth, and speed. The signal controller acts as a relay node for signal transmission, ensuring stable signal transmission throughout the entire system.

[0041] Example 1

[0042] like Figure 1 and Figure 2 As shown, a method for calculating the volume of intaglio cell engraving includes:

[0043] S1. First, outline the cell contour and discretize the contour into a plurality of contour points, with adjacent contour points being spaced within a first preset range;

[0044] S2. Establish a coordinate system at the center of the contour, and use an automatic measurement camera to measure the coordinates of the contour points based on the origin of the coordinate system;

[0045] S3, dividing the outline into multiple areas within a second preset range;

[0046] S4. Fitting the coordinates of the contour points in the same area into an equation, integrating to calculate the area of the area, and calculating the volume of the area based on the depth;

[0047] S5. Add the volumes of different areas of the cell to finally obtain the cell volume.

[0048] The equation adopts polynomial fitting, and the formula is as follows:

[0049] ya n x n +a n-1 x n-1 +…+a1x+a0

[0050] n is the degree of the polynomial, a n is the coefficient, x is the horizontal coordinate of the contour point, and y is the fitting equation of the contour in the area.

[0051] Using the least squares method, the coefficient a of the polynomial is determined by constructing the error square sum function for the coordinates of the contour points and taking its partial derivatives. n .

[0052] The area S has the following formula:

[0053]

[0054] c is the ordinate of the starting point of the region, b is the ordinate of the end point of the region, x is the abscissa of the contour point, and y is the fitting equation of the contour in the region.

[0055] The magnifying glass of the automatic measuring camera is of M10 / 0.25 specification.

[0056] In this embodiment, an automatic measurement camera is used to capture the cells and outline the cell contours, ensuring the accuracy of the contours for accurate subsequent calculations.

[0057] Since the cell patterns are symmetrical, only one side of the equation needs to be calculated for integration, and the overall volume can then be calculated by multiplying by 2. The origin of the coordinate system is set at the center of the cell, with x- and y-axes established horizontally and vertically, respectively. After outlining the contour, the contour curve is discretized into several contour points. An automatic measurement camera measures the distance between the contour points and the x- and y-axes to obtain the coordinates of the contour points. Because the contour curve is irregular and affected by its curvature, it cannot be accurately calculated. Dividing the contour curve into multiple segments facilitates fitting the equation while improving accuracy. By adjusting the first and second preset ranges, the accuracy of the equation can be changed to better reflect the contour curve. The area of each region is then calculated separately, and the volume of that region is calculated based on the preset depth. The volume of each region is added together to obtain the cell volume.

[0058] In order to improve the calculation accuracy, the size of each area and the number of contour points in the area are adjusted. The smaller the range of a single area and the more contour points there are, the more it can reflect the changing trend of the curve, the better it can restore the contour of the cell, and fit the actual contour, so that the calculation results can better reflect the actual situation.

[0059] The cell contour is a symmetrical figure. The first preset range is smaller than the second preset range. The first preset range is 1 mm, and the second preset range is 10 mm. The difference between the vertical coordinates of the outermost contour points is equal to the second preset range value.

[0060] In this embodiment, the cell contour is a symmetrical figure. If the first preset range is smaller than the second preset range, multiple contour points can be fitted in the same area. The more contour points there are, the more realistic the fitting equation is. At the same time, the difference between the ordinates of the outermost contour points is equal to the second preset range value, which means that both the starting point and the end point in the same area have contour points involved in the fitting, which can better reflect the curve.

[0061] Example 2

[0062] like Figure 3 As shown, an engraving system for engraving the volume of intaglio cells is characterized in that it includes an automatic measuring camera, a host, a PCI_E serial port card, a signal controller, a bus terminal, a contact memory and an engraving head, wherein the host, PCI_E serial port card, signal controller, bus terminal, contact memory and engraving head are connected in sequence, the host is communicatively connected to the automatic measuring camera, the contact memory stores the parameters of the cell contour, and the host controls the engraving head to engrave the cells by transmitting control signals in sequence through the PCI_E serial port card, signal controller, bus terminal and contact memory.

[0063] The system further comprises a camera interface, which is communicatively connected with the automatic measurement camera, the contact memory and the bus terminal respectively.

[0064] The camera interface comprises an image receiving port, and the image receiving port is communicatively connected to the automatic measurement camera.

[0065] The camera interface device further includes an image output port, and the camera is communicatively connected to the host via the image receiving port.

[0066] The camera interface further comprises an illumination light port and an illumination light, wherein the illumination light port is connected to the illumination light.

[0067] The camera interface device further includes a power supply interface, which is connected to the automatic measurement camera.

[0068] The camera interface device further includes a bus terminal control port, and the bus terminal is communicatively connected to the host via the bus terminal control port.

[0069] The camera interface further includes a contact memory communication port, and the contact memory communication port is communicatively connected to the contact memory.

[0070] The system further comprises a contact reader / writer, and the contact memory communication port is connected to the contact reader / writer through contact memory communication.

[0071] The engraving head comprises a motor and an engraving needle.

[0072] In this embodiment, the PCI_E serial port card is used to connect the computer and the control system of the electronic engraving machine, provide a high-speed data transmission channel, and ensure the real-time transmission of the engraving data.

[0073] Signal controller: responsible for receiving engraving instructions from the computer and converting them into control signals to control the movement trajectory, engraving depth and speed of the engraving head.

[0074] Bus terminal: As a relay node for signal transmission, it ensures stable transmission of signals throughout the system and connects the signal controller, Touch Memory module and engraving head.

[0075] Touch Memory: used to store engraving parameters (such as cell size, depth, engraving path, etc.); it interacts with the reader / writer through physical contact to ensure data security and reliability.

[0076] High-precision engraving head: uses high-precision motor and engraving needle to ensure the engraving accuracy of the mesh cells, can achieve uniform engraving of tiny mesh cells, and ensure consistent ink content.

[0077] High-precision engraving: Through high-precision engraving heads and precise control systems, the size and depth of each cell are ensured to be consistent.

[0078] Data security: Touch Memory uses physical contact to exchange data, preventing data from being tampered with or stolen.

[0079] Easy to operate: Engraving parameters are stored in Touch Memory for quick call and switching.

[0080] Strong adaptability: The system can flexibly adjust engraving parameters according to different printing requirements.

[0081] Traceability: The parameters and results of each engraving can be recorded and stored to facilitate quality traceability and process optimization.

[0082] The camera interface is connected as follows Figure 4As shown, USB in receives images from the high-speed camera and transmits them to the engraving control software via USB A. LED power X11 illuminates the high-speed camera. L-X1 and L+X1 power the high-speed camera motor. Trig+ and trig- power the limit switches that move the high-speed camera closer to the object being measured. A130 is the bus terminal control signal. Trigger X10 is the high-speed camera signal line. Touch memory X12 is the signal line for the contact memory chip in the height engraving head. Camera interface is the camera interface, and TM stands for Touch Memory.

[0083] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for calculating the volume of intaglio cell engraving, characterized in that: The method specifically includes: S1. First, outline the cell contour and discretize the contour into a plurality of contour points, with adjacent contour points being spaced within a first preset range; S2. Establish a coordinate system at the center of the contour, and use an automatic measurement camera to measure the coordinates of the contour points based on the origin of the coordinate system; S3, dividing the outline into multiple areas within a second preset range; S4. Fitting the coordinates of the contour points in the same area into an equation, integrating to calculate the area of the area, and calculating the volume of the area based on the depth; S5. Add the volumes of different areas of the cell to finally obtain the cell volume.

2. The method for calculating the volume of intaglio cell engraving according to claim 1, characterized in that: The equation adopts polynomial fitting, and the formula is as follows: y=a n x n +a n-1 x n-1 +…+a1x+a0 n is the degree of the polynomial, a n is the coefficient, x is the horizontal coordinate of the contour point, and y is the fitting equation of the contour in the area.

3. The method for calculating the volume of intaglio cell engraving according to claim 2, characterized in that: Using the least squares method, the coefficient a of the polynomial is determined by constructing the error square sum function for the coordinates of the contour points and taking its partial derivatives. n .

4. The method for calculating the volume of intaglio cell engraving according to claim 1, characterized in that: The cell outline is a symmetrical figure.

5. The method for calculating the volume of intaglio cell engraving according to claim 1, characterized in that: The first preset range is smaller than the second preset range.

6. The method for calculating the volume of intaglio cell engraving according to claim 5, characterized in that: The first preset range is 1 mm, and the second preset range is 10 mm.

7. The method for calculating the volume of intaglio cell engraving according to claim 1, characterized in that: The difference between the ordinates of the outermost contour points is equal to a second preset range value.

8. The method for calculating the volume of intaglio cell engraving according to claim 1, characterized in that: The area S has the following formula: S=∫ c b y dx c is the ordinate of the starting point of the region, b is the ordinate of the end point of the region, x is the abscissa of the contour point, and y is the fitting equation of the contour in the region.

9. A method for calculating the volume of intaglio cell engraving according to claim 1, characterized in that: The magnifying glass of the automatic measuring camera is of M10 / 0.25 specification.

10. An engraving system for gravure cell volume engraving according to any one of claims 1 to 9, characterized in that: The invention comprises a host, a PCI_E serial port card, a signal controller, a bus terminal, a contact memory and an engraving head, wherein the host, the PCI_E serial port card, the signal controller, the bus terminal, the contact memory and the engraving head are connected in sequence, the host is communicatively connected to an automatic measuring camera, the contact memory stores parameters of a cell contour, and the host transmits a control signal in sequence through the PCI_E serial port card, the signal controller, the bus terminal and the contact memory to control the engraving head to engrave cells.

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