A method of laser cutting a multi-layer full open steel plate

Abstract

The present application belongs to the technical field of silk screen, and in particular to a method for laser cutting a multi-layer full-opening steel screen, comprising the following steps: selecting suitable polyimide film and solid steel screen, preparing one of picosecond and femtosecond laser cutting equipment, ensuring that the cutting equipment can adjust the focal point position, cutting power and cutting frequency parameters; designing the pattern of the multi-layer full-opening screen, ensuring that each layer of the pattern meets the cutting requirements, and performing reasonable layout and alignment design; adjusting the parameters of the laser cutting equipment in turn, cutting each pattern layer by layer, preparing the polyimide film, and uniformly pressing the polyimide film onto the multi-layer full-opening screen. The present application solves the problem that the size change of the screen pattern cannot be accurately aligned to the pattern opening area for cutting the polyimide film, and can independently select the thickness of each layer of the multi-layer steel screen, thereby improving the yield of the multi-layer full-opening screen and effectively improving the problems of screen broken grid and edge slurry leakage.

Description

Technical Field

[0001] This invention relates to the field of screen printing technology, specifically a method for laser cutting multi-layered, fully open steel plates. Background Technology

[0002] Currently, the multi-layer, fully-opening steel plates used in the domestic photovoltaic industry are mainly made using electroplated multi-layer steel plates. Due to the high technical barriers of precision electroplating, the cost of the steel plates is very high. Furthermore, the steel plates are formed by electroplating different opening layers multiple times, which causes the steel plates to be stretched under tension when laminated onto the dummy frame, resulting in changes in dimensions and a decrease in the straightness of the steel plates. During printing, the friction of the squeegee can easily cause the multi-layer electroplated materials to separate, leading to printing leakage and incomplete printing. The electroplating process is prone to forming residue that clogs the screen, and the multi-layer structure is unstable, resulting in broken printing grids. It is difficult to control the size of the plate, resulting in a high plate defect rate, low production efficiency, and short screen printing life.

[0003] The existing technology has the following defects or problems: As mentioned above, existing electroplated multi-layer fully open steel plates, after being laminated onto polyester screens with different tensions, exhibit varying dimensional changes, making it difficult to control the graphic dimensions. Then, a polyimide film is pressed onto the multi-layer fully open steel plate, and picosecond or femtosecond laser cutting equipment is used to cut printing grooves in the graphic opening area. During cutting, due to the variation in the screen graphic dimensions, it is impossible to accurately align the polyimide film with the graphic opening area. This plate-making process has a high defect rate, is prone to inaccurate cutting alignment leading to printed grid breaks, and is difficult to manufacture, resulting in a short screen printing lifespan.

[0004] It should be noted that the above content falls within the inventor's technical knowledge and does not necessarily constitute prior art. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for laser cutting multi-layer fully open steel plates, which solves the current problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for laser cutting multi-layer fully open steel plates, comprising the following steps: Step 1: Select suitable polyimide film and solid steel plate to ensure that the materials meet the design requirements; Step 2: Prepare one of the picosecond or femtosecond laser cutting equipment and perform the necessary adjustments to ensure that the cutting equipment can adjust the focal position, cutting power, and cutting times. Step 3: Design the pattern for the multi-layered, fully open screen, ensuring that each layer meets the cutting requirements, and perform reasonable layout and alignment design; Step 4: Adjust the focal position of the laser cutting equipment according to the material of the steel plate and the thickness of the polyimide film to ensure the cutting accuracy. At the same time, set appropriate cutting power, number of cuts and cutting offset parameters. Preliminary testing is usually required to ensure that the cutting effect meets the requirements. Step 5: Use laser cutting equipment to cut the first layer of pattern on the steel plate, ensuring cutting precision and position accuracy. During the cutting process, record the focal point position, cutting power, and number of cuts to facilitate subsequent process adjustments and optimizations. Based on the effect of the first layer of cutting, adjust the focal position, cutting power, and number of cutting times of the laser cutting equipment to ensure that the cutting of the second layer of pattern is not affected by the first layer of pattern; Step 6: On the first layer pattern, use the adjusted cutting parameters to continue cutting out the second layer pattern. At this time, ensure that the cutting position is accurately aligned with the opening position of the first layer pattern. Record the process parameters during the second layer cutting process for subsequent layer adjustments and improvements. Step 7: Adjust the parameters of the laser cutting equipment in sequence and cut each pattern layer by layer until the required multi-layer opening pattern is completed. Each layer of cutting needs to be precisely aligned with the cutting position of the previous layer. After cutting each layer, check the alignment of the pattern to ensure that the openings of the patterns between different layers can be completely aligned to avoid deviations. Step 8: On the cut multi-layer steel plate, prepare a polyimide film, ensuring that it matches the size of the screen and steel plate. Press the polyimide film evenly onto the multi-layer fully open screen, ensuring that the film layer is in complete contact with the steel plate, without bubbles or other unevenness. Step 9: Based on the structure of the multi-layered opening screen, fine-tune the cutting parameters to ensure that accurate printing grooves are cut through the multi-layered opening pattern of the steel plate. Using the adjusted cutting parameters, accurately cut the printing grooves through the multi-layered opening pattern of the steel plate to ensure that the groove depth and width meet the design requirements. Step 10: After cutting, inspect and correct the finished product, and perform post-processing.

[0007] In some embodiments, the laser power of the laser cutting device is controlled between 10-50W, the pulse frequency is controlled between 20kHz and 50kHz, and the cutting speed is controlled between 30-60mm / s.

[0008] In some embodiments, the laser focus is set on the material surface, the cutting power is 30W, the cutting speed is 30mm / s, and the pulse frequency is 25kHz.

[0009] In some embodiments, the laser focus position needs to be adjusted to a suitable position to ensure that it can cut the polyimide film without damaging the previous layers, and the cutting power is specifically 30W, the cutting speed is specifically 35mm / s, and the pulse frequency is 30kHz.

[0010] In some embodiments, the focus needs to be readjusted when cutting each layer of the pattern to avoid cross-interference between the layers. The cutting power of each pattern is controlled at 30W, the cutting speed is 40mm / s, and the laser pulse frequency is 30kHz.

[0011] In some embodiments, the pressing operation is performed by a pressing device, with the pressure set between 500-1000 kPa and the pressing time controlled between 30-60 seconds to ensure uniform film adhesion.

[0012] In some embodiments, the sheet inspection is performed by using a microscope to check the alignment accuracy. If inaccurate alignment or uneven cutting is detected, the cutting speed, power and focal position are adjusted. The post-processing steps of the finished product are carried out by ultrasonic cleaning equipment to remove the residue generated during the cutting process.

[0013] In some embodiments, the first layer cutting opening area is larger than the second layer cutting opening area, and the size of the graphic printing opening area is the same as that of the second layer cutting opening area, for the paste to pass through during printing.

[0014] Compared with the prior art, the present invention provides a method for laser cutting multi-layer fully open steel plates, which has the following beneficial effects: This method of laser cutting multi-layer fully open steel plate solves the problem of inaccurate alignment of polyimide film to the opening area of ​​the pattern due to changes in the size of the pattern. It allows for independent selection of the thickness of each layer of the multi-layer steel plate, improving the yield of multi-layer fully open screen plates and effectively improving the problems of screen plate breakage and edge leakage. This method optimizes the problem of non-compliant graphic dimensions in the fully open steel plate manufacturing process, greatly improving the yield of finished products, increasing the strength of the screen, extending the printing life, and reducing production costs. After the steel plate pattern size is cut, it is aligned with the printed graphic size of the cut polyimide film, improving the overall strength of the screen, resisting scraper friction, thus preventing the steel plate from delaminating, cracking, and leaking ink, and extending the screen life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the laser-cut multi-layer fully open steel plate opening structure of the present invention. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] It should be understood that the step numbers used in the text are for ease of description only and are not intended to limit the order in which the steps are performed.

[0018] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0019] The terms “comprising” and “including” indicate the presence of the described feature, whole, step, operation, element and / or component, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0020] The term “and / or” refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes these combinations.

[0021] Please see Figure 1 In this embodiment: a method for laser cutting multi-layer fully open steel plates includes the following steps: Step 1: Select suitable polyimide film and solid steel plate to ensure that the materials meet the design requirements; Step 2: Prepare one of the picosecond or femtosecond laser cutting equipment and perform the necessary adjustments to ensure that the cutting equipment can adjust the focal position, cutting power, and cutting times. The laser power of the laser cutting equipment should be controlled between 10-50W, the pulse frequency should be controlled between 20kHz and 50kHz, and the cutting speed should be controlled between 30-60mm / s. Step 3: Design the pattern for the multi-layered, fully open screen, ensuring that each layer meets the cutting requirements, and perform reasonable layout and alignment design; Step 4: Adjust the focal position of the laser cutting equipment according to the material of the steel plate and the thickness of the polyimide film to ensure the cutting accuracy. At the same time, set appropriate cutting power, number of cuts and cutting offset parameters. Preliminary testing is usually required to ensure that the cutting effect meets the requirements. Step 5: Use laser cutting equipment to cut the first layer of pattern on the steel plate, ensuring cutting precision and position accuracy. During the cutting process, record the focal point position, cutting power, and number of cuts to facilitate subsequent process adjustments and optimizations. Based on the effect of the first layer of cutting, adjust the focal position, cutting power, and number of cutting times of the laser cutting equipment to ensure that the cutting of the second layer of pattern is not affected by the first layer of pattern; During the first layer of pattern processing, the laser focus is set on the material surface, the cutting power is 30W, the cutting speed is 30mm / s, and the pulse frequency is 25kHz. Step 6: On the first layer pattern, use the adjusted cutting parameters to continue cutting out the second layer pattern. At this time, ensure that the cutting position is accurately aligned with the opening position of the first layer pattern. Record the process parameters during the second layer cutting process for subsequent layer adjustments and improvements. During the second layer pattern processing, the laser focus position needs to be adjusted to a suitable position to ensure that it can cut the polyimide film without damaging the previous layer. The specific cutting power is 30W, the specific cutting speed is 35mm / s, and the pulse frequency is 30kHz. Step 7: Adjust the parameters of the laser cutting equipment in sequence and cut each pattern layer by layer until the required multi-layer opening pattern is completed. Each layer of cutting needs to be precisely aligned with the cutting position of the previous layer. After cutting each layer, check the alignment of the pattern to ensure that the openings of the patterns between different layers can be completely aligned to avoid deviations. Each subsequent pattern cutting requires refocusing to avoid cross-interference between layers. The cutting power of each pattern is controlled at 30W, the cutting speed is 40mm / s, and the laser pulse frequency is 30kHz. Step 8: On the cut multi-layer steel plate, prepare a polyimide film, ensuring that it matches the size of the screen and steel plate. Press the polyimide film evenly onto the multi-layer fully open screen, ensuring that the film layer is in complete contact with the steel plate, without bubbles or other unevenness. The pressing operation is carried out by a pressing device, the pressure of which needs to be set between 500-1000 kPa, and the pressing time controlled between 30-60 seconds to ensure uniform film adhesion; Step 9: Based on the structure of the multi-layered opening screen, fine-tune the cutting parameters to ensure that accurate printing grooves are cut through the multi-layered opening pattern of the steel plate. Using the adjusted cutting parameters, accurately cut the printing grooves through the multi-layered opening pattern of the steel plate to ensure that the groove depth and width meet the design requirements. Step 10: After cutting, inspect and correct the finished product, and perform post-processing. The alignment accuracy is checked using a microscope during the final inspection. If inaccurate alignment or uneven cutting is detected, the cutting speed, power, and focal point are adjusted.

[0022] It should be noted that the first layer cutting opening area is larger than the second layer cutting opening area, and the size of the graphic printing opening area is the same as that of the second layer cutting opening area, which is used for the paste to pass through during printing.

[0023] The post-processing steps of the finished product are carried out by ultrasonic cleaning equipment to remove the residue generated during the cutting process.

[0024] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0025] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for laser cutting multi-layer fully open steel plates, characterized in that, Includes the following steps: Step 1: Select suitable polyimide film and solid steel plate to ensure that the materials meet the design requirements; Step 2: Prepare one of the picosecond or femtosecond laser cutting equipment and perform the necessary adjustments to ensure that the cutting equipment can adjust the focal position, cutting power, and cutting times. Step 3: Design the pattern for the multi-layered, fully open screen, ensuring that each layer meets the cutting requirements, and perform reasonable layout and alignment design; Step 4: Adjust the focal position of the laser cutting equipment according to the material of the steel plate and the thickness of the polyimide film to ensure the cutting accuracy. At the same time, set appropriate cutting power, number of cuts and cutting offset parameters. Preliminary testing is usually required to ensure that the cutting effect meets the requirements. Step 5: Use laser cutting equipment to cut the first layer of pattern on the steel plate, ensuring cutting precision and position accuracy. During the cutting process, record the focal point position, cutting power, and number of cuts to facilitate subsequent process adjustments and optimizations. Based on the effect of the first layer of cutting, adjust the focal position, cutting power, and number of cutting times of the laser cutting equipment to ensure that the cutting of the second layer of pattern is not affected by the first layer of pattern; Step 6: On the first layer pattern, use the adjusted cutting parameters to continue cutting out the second layer pattern. At this time, ensure that the cutting position is accurately aligned with the opening position of the first layer pattern. Record the process parameters during the second layer cutting process for subsequent layer adjustments and improvements. Step 7: Adjust the parameters of the laser cutting equipment in sequence and cut each pattern layer by layer until the required multi-layer opening pattern is completed. Each layer of cutting needs to be precisely aligned with the cutting position of the previous layer. After cutting each layer, check the alignment of the pattern to ensure that the openings of the patterns between different layers can be perfectly aligned to avoid deviations. Step 8: On the cut multi-layer steel plate, prepare a polyimide film, ensuring that it matches the size of the screen and steel plate. Press the polyimide film evenly onto the multi-layer fully open screen, ensuring that the film layer is in complete contact with the steel plate without bubbles or other unevenness. Step 9: Based on the structure of the multi-layered opening screen, fine-tune the cutting parameters to ensure that accurate printing grooves are cut through the multi-layered opening pattern of the steel plate. Using the adjusted cutting parameters, accurately cut the printing grooves through the multi-layered opening pattern of the steel plate to ensure that the groove depth and width meet the design requirements. Step 10: After cutting, inspect and correct the finished product, and perform post-processing.

2. The method for laser cutting multi-layer fully open steel plates according to claim 1, characterized in that: In step two, the laser power of the laser cutting equipment is controlled between 10-50W, the pulse frequency is controlled between 20kHz and 50kHz, and the cutting speed is controlled between 30-60mm / s.

3. The method for laser cutting multi-layer fully open steel plates according to claim 2, characterized in that: In step five, the laser focus is set on the material surface, the cutting power is 30W, the cutting speed is 30mm / s, and the pulse frequency is 25kHz.

4. The method for laser cutting multi-layer fully open steel plates according to claim 1, characterized in that: In step seven, the focus needs to be readjusted for each layer of pattern cutting to avoid cross-interference between layers. The cutting power of each pattern is controlled at 30W, the cutting speed is 40mm / s, and the laser pulse frequency is 30kHz.

5. The method for laser cutting multi-layer fully open steel plates according to claim 1, characterized in that: The pressing operation described in step eight is carried out by a pressing device. The pressure should be set between 500-1000 kPa and the pressing time should be controlled between 30-60 seconds to ensure uniform film adhesion.

6. The method for laser cutting multi-layer fully open steel plates according to claim 1, characterized in that: In step ten, the finished product is inspected using a microscope to check the alignment accuracy. If inaccurate alignment or uneven cutting is detected, the cutting speed, power, and focal point are adjusted. The post-processing steps of the finished product are carried out by ultrasonic cleaning equipment to remove the residue generated during the cutting process.

7. The method for laser cutting multi-layer fully open steel plates according to claim 1, characterized in that: The first layer cutting opening area is larger than the second layer cutting opening area. The size of the graphic printing opening area is the same as that of the second layer cutting opening area, which is used for the paste to pass through during printing.

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