Cutting method for metal plate with oil

Abstract

The invention discloses a method for cutting a metal plate with oil, which belongs to the field of plate processing, and comprises the following steps of: uncoiling a coiled material, balancing an oil film, detecting the thickness of the oil film, adjusting a balancing roller, determining cutting parameters, dynamically adjusting and supplementing oil, adjusting the pressure of the balancing roller according to the thickness of the oil film detected in real time, and when the pressure of the balancing roller reaches a proper value, adjusting the pressure of the balancing roller. Then cutting parameters are determined according to the oil film thickness detected in real time, single finished products are formed through cutting, finally, oil is supplemented to the single finished products, and through the design, the influence of uneven oil film thickness on metal plate machining is reduced.

Description

Technical Field

[0001] This invention relates to sheet metal processing, and more particularly to a method for cutting oily metal sheets. Background Technology

[0002] To prevent rust from forming on the surface of cold-rolled metal coils during storage and transportation, which could affect product performance and quality, an oil coating is applied to the surface of the metal sheet to block water and oxygen contact and prevent electrochemical corrosion. The metal sheet is oiled according to different customer needs and standards before being rolled into a coil for easy storage and transportation.

[0003] During storage and transportation, the oil film on the surface of the metal coil is affected by gravity, resulting in a thinner top and a thicker bottom, leading to uneven oil film thickness on the surface of the metal coil.

[0004] Because the oil film reduces the friction coefficient between the rolls and the sheet metal during the cutting process, uneven oil film thickness on the metal surface has a significant impact on sheet metal forming and processing, affecting cutting accuracy and burr formation. While existing technologies exist for measuring oil film thickness, they all treat the oil film thickness on the metal sheet surface as a fixed value, without considering the impact of uneven oil film thickness on sheet metal forming and processing. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, one of the objectives of the present invention is to provide a method for cutting oily metal sheets by adjusting the cutting parameters according to the real-time detected oil film thickness.

[0006] One of the objectives of this invention is achieved through the following technical solution: A method for cutting oily metal sheets includes the following steps: Uncoiling: Uncoiling a rolled metal sheet to form a horizontal metal sheet, which moves along the conveying direction to facilitate cutting; Oil film equalization: An equalization roller is provided, which is located between the unwinding structure and the oil film thickness detection structure. The equalization roller contacts the metal sheet to make the oil film on the surface of the metal sheet uniform. Oil film thickness detection: The emitter of the oil film thickness detection structure emits infrared light to illuminate the metal plate. After passing through the oil film, part of the infrared light is absorbed and part is reflected back. The thickness of the oil film is measured by the change in infrared intensity, i.e., absorbance. There are multiple detection points along the width direction of the metal plate. These multiple detection points along the width direction of the metal plate form a detection line. The detection line has the same shape as the cutting path of the tool. The standard deviation and average value of the oil film thickness are calculated based on the oil film thickness at multiple detection points. Adjusting the equalizing roller: When the standard deviation of the oil film thickness is greater than the threshold or the average value of the oil film thickness is less than the threshold, the detection line is the first detection line. Adjust the pressure of the equalizing roller and repeat the oil film thickness detection until the standard deviation of the oil film thickness is less than the threshold and the average value of the oil film thickness is greater than the threshold. Cutting parameters are determined as follows: When the standard deviation of the oil film thickness is less than the threshold and the average value of the oil film thickness is greater than the threshold, the detection line is the second detection line. The tool pressure and tool angle are determined according to the average value of the oil film thickness on the second detection line. The tool cuts along the position of the second detection line on the metal sheet to form the end material. Dynamic adjustment: Continue to detect the oil film thickness on the metal sheet to form multiple second detection lines. The distance between two adjacent second detection lines is the length of a single finished product after the metal sheet is cut. Calculate the average oil film thickness of each second detection line. The pressure and angle of the cutter for each cut are calculated based on the average oil film thickness of the corresponding second detection line. Oil replenishment: Apply oil to the cut areas on both sides of the multiple individual finished products.

[0007] Furthermore, along the length of the metal sheet, there are multiple first detection lines, and the distance between the first and last two first detection lines is less than the single length of the metal sheet after it has been cut.

[0008] Furthermore, the oil film thickness detection structure is located between the equalizing roller and the cutting structure, and the oil film thickness detection structure is close to the equalizing roller to reduce the distance between two adjacent first detection lines.

[0009] Furthermore, when the individual finished product is rectangular or right-angled trapezoidal, in the cutting parameter determination step, when the standard deviation of the oil film thickness is less than the threshold and the average value of the oil film thickness is greater than the threshold, the distance L between the end of the metal sheet and the detection line is calculated according to the feeding speed of the metal sheet. Based on the distance L and the length of the individual finished product, the next detection line is set. At this time, the next detection line is the second detection line, so that the length of the end material is the same as the length of the individual finished product. In the oil replenishment step, oil is replenished on the upper and lower surfaces of the end material and the cut position to form an individual finished product.

[0010] Furthermore, when the individual finished product is triangular or parallelogram-shaped, in the cutting parameter determination step, when the standard deviation of the oil film thickness is less than the threshold and the average value of the oil film thickness is greater than the threshold, the detection line is the second detection line, and the end material is waste material.

[0011] Furthermore, in the step of determining the cutting parameters, the tool pressure P = P0(1 + 0.15H), where P0 is the base pressure, which is the cutting pressure of the tool when the metal sheet is not coated with oil, and H is the average oil film thickness in μm; the angle of the tool is the deflection α = A * H; where A is the deflection coefficient.

[0012] Furthermore, the oil-coated metal sheet cutting method also includes quality inspection. The quality inspection step is located between the cutting parameter determination step and the dynamic adjustment step. Specifically, the quality inspection step involves: acquiring an image of the cutting edge using an industrial camera, analyzing the edge burrs and cutting accuracy of the cutting edge based on the image, and adjusting the deflection coefficient based on the edge burrs and cutting accuracy.

[0013] Furthermore, in the step of adjusting the deflection coefficient based on the edge burrs and the cutting accuracy, the weight of the cutting accuracy is greater than the weight of the edge burrs.

[0014] Furthermore, in the step of adjusting the equalizing roller, when the standard deviation of the oil film thickness is greater than the threshold, the pressure of the equalizing roller is increased; when the average value of the oil film thickness is less than the threshold, the pressure of the equalizing roller is decreased.

[0015] Furthermore, in the oil film thickness detection step, the plurality of detection points on the detection line are uniformly distributed along the width direction of the metal sheet.

[0016] Compared with existing technologies, the oil-coated metal sheet cutting method of the present invention involves the following steps: unwinding of the roll, equalizing the oil film, detecting the oil film thickness, adjusting the equalizing roller, determining cutting parameters, dynamic adjustment, and oil replenishment. The pressure of the equalizing roller is adjusted according to the real-time detected oil film thickness. When the pressure of the equalizing roller reaches a suitable level, the cutting parameters are determined again based on the real-time detected oil film thickness, and the sheet is cut into individual finished products. Finally, oil is replenished to each individual finished product. Through the above design, the impact of uneven oil film thickness on the processing of metal sheets is reduced. Attached Figure Description

[0017] Figure 1 This is a flowchart of the oil-coated metal sheet cutting method of the present invention; Figure 2 This is a schematic diagram of the oil-coated metal sheet cutting method of the present invention; Figure 3 This is a schematic diagram of oil film thickness detection when a single finished product is rectangular. Figure 4 This is a schematic diagram for detecting the oil film thickness when a single finished product is a parallelogram.

[0018] In the diagram: 10, metal coil; 20, uncoiling structure; 30, metal sheet; 40, equalizing roller; 50, oil film thickness detection structure; 60, cutting tool; 70, industrial camera. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the 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.

[0020] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or it can be fixed through another intermediate component. When a component is said to be "connected to" another component, it can be directly connected to the other component or it may be fixed through another intermediate component. When a component is said to be "set on" another component, it can be set directly on the other component or it may be set through another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] like Figures 1 to 2 As shown, the method for cutting oily metal sheets according to the present invention includes the following steps: Uncoiling: Uncoiling a rolled metal sheet to form a horizontal metal sheet, which moves along the conveying direction to facilitate cutting; Oil film equalization: An equalization roller is set up between the unwinding structure and the oil film thickness detection structure. The equalization roller contacts the metal sheet to make the oil film on the surface of the metal sheet uniform. Oil film thickness detection: The emitter of the oil film thickness detection structure emits infrared light to illuminate the metal plate. After passing through the oil film, part of the infrared light is absorbed and part is reflected back. The thickness of the oil film is measured by the change in infrared intensity, i.e., absorbance. There are multiple detection points along the width direction of the metal plate. These multiple detection points along the width direction of the metal plate form a detection line. The detection line has the same shape as the cutting path of the tool. The standard deviation and average value of the oil film thickness are calculated based on the oil film thickness at multiple detection points. Adjusting the equalizing roller: When the standard deviation of the oil film thickness is greater than the threshold or the average value of the oil film thickness is less than the threshold, the detection line is the first detection line. Adjust the pressure of the equalizing roller and repeat the oil film thickness detection until the standard deviation of the oil film thickness is less than the threshold and the average value of the oil film thickness is greater than the threshold. Cutting parameters are determined as follows: When the standard deviation of the oil film thickness is less than the threshold and the average value of the oil film thickness is greater than the threshold, the detection line is the second detection line. The tool pressure and tool angle are determined according to the average value of the oil film thickness on the second detection line. The tool cuts along the position of the second detection line on the metal sheet to form the end material. Dynamic adjustment: Continue to detect the oil film thickness on the metal sheet to form multiple second detection lines. The distance between two adjacent second detection lines is the length of a single finished product after the metal sheet is cut. Calculate the average oil film thickness of each second detection line. The pressure and angle of the cutter for each cut are calculated based on the average oil film thickness of the corresponding second detection line. Oil replenishment: Apply oil to the cut areas on both sides of multiple individual finished products.

[0023] In the oil-coated metal sheet cutting method of the present invention, the initial material is a metal coil 10, which is metal stored in a roll. To prevent oxidation and rust during storage, the metal surface is coated with oil. However, during the storage of the metal coil 10, due to gravity, the distribution of oil on the metal surface will change. Specifically, the oil layer on the top of the metal surface becomes thinner, while the oil layer on the bottom of the metal surface becomes thicker, resulting in an uneven oil layer on the metal surface.

[0024] The uncoiling step specifically involves: the wound metal coil 10 is passed through the uncoiling structure 20 to form a straight metal sheet 30. The metal sheet 30 moves along the conveying structure... Figure 2 Move in the direction of the arrow.

[0025] The purpose of the oil film equalization step is to mitigate the unevenness of the oil layer caused by the storage of the metal coil 10, reducing the difference in oil film thickness at different locations. Simultaneously, it prevents the oil film from being wiped away in parts of the metal sheet 30 due to handling and uncoiling, reducing errors in subsequent oil film thickness measurements. Specifically, the equalization roller 40 is located between the uncoiling structure 20 and the oil film thickness detection structure 50. The equalization roller 40 contacts the metal sheet 30 to ensure a uniform oil film on its surface. The initial pressure of the equalization roller 40 in contact with the metal sheet 30 is an empirical value, which is subsequently adjusted based on the standard deviation and average oil film thickness of the oil film thickness detection structure 50. During the pressure adjustment of the equalization roller 40, the line connecting the detection points of the oil film thickness detection structure 50 forms the first detection line. When the pressure of the equalization roller 40 is too high, it will cause the oil film thickness to decrease. Therefore, when the average oil film thickness is less than a threshold, the pressure of the equalization roller 40 is reduced. When the pressure of the equalizing roller 40 is too low, it cannot weaken the unevenness of the oil layer, or the adjustment amount is too small. At this time, the standard deviation of the oil film thickness is large. Therefore, when the standard deviation of the oil film thickness is greater than the threshold, the pressure of the equalizing roller is increased.

[0026] The purpose of the oil film thickness detection step is to detect the surface oil film thickness of the metal sheet 30 in real time, so as to adjust the pressure of the equalizing roller 40 and the cutting parameters of the cutter 60. The oil film thickness detection is performed along the width direction of the metal sheet 30, with multiple detection points evenly spaced. When adjusting the pressure of the equalizing roller 40, the detection line formed by the multiple detection points only needs to be along the width direction of the metal sheet 30; when adjusting the cutting parameters of the cutter 60, the detection line formed by the multiple detection points not only needs to be along the width direction of the metal sheet 30, but also needs to be the same as the cutting path of the cutter 60 (the cutting direction of the cutter). In this embodiment, since the oil film thickness measurement for adjusting the pressure of the equalizing roller 40 and the cutting parameters of the cutter 60 uses the same set of structures, the connection line of the multiple detection points of the oil film thickness detection structure 50 is uniformly arranged along the width direction of the metal sheet 30 and is the same as the cutting path of the cutter 60 (the cutting direction of the cutter).

[0027] In this embodiment, infrared light measurement technology is used. The emitter emits infrared light to illuminate the metal plate 30. After passing through the oil film, part of the infrared light is absorbed and part is reflected back. The thickness of the oil film is measured by the change in infrared intensity, i.e., absorbance. The standard deviation and average value of the oil film thickness are calculated based on the oil film thickness at multiple detection points.

[0028] The adjustment steps for the equalizing roller are as follows: When the standard deviation of the oil film thickness is greater than the threshold or the average oil film thickness is less than the threshold, the detection line is the first detection line. When the standard deviation of the oil film thickness is greater than the threshold, the pressure of the equalizing roller 40 is increased; when the average oil film thickness is less than the threshold, the pressure of the equalizing roller 40 is decreased. After adjusting the pressure of the equalizing roller 40 once, the oil film thickness detection is repeated, and the first detection line is formed again. The standard deviation of the oil film thickness and the average oil film thickness after the equalizing roller 40 is adjusted are calculated until the standard deviation of the oil film thickness is less than the threshold and the average oil film thickness is greater than the threshold. During this process, multiple first detection lines will be formed, and the distance between the first and last two first detection lines is less than the length of a single finished product. Therefore, the oil film thickness detection structure 50 is located between the equalizing roller 40 and the cutter 60, and the oil film thickness detection structure 50 is close to the equalizing roller 40 to reduce the distance between adjacent first detection lines.

[0029] like Figure 3 As shown, when a single finished product is rectangular or right-angled trapezoidal, in the step of determining cutting parameters, when the standard deviation of the oil film thickness is less than the threshold and the average value of the oil film thickness is greater than the threshold, the corresponding first detection line has completed the adjustment of the equalizing roller 40. However, in order to make the end of the metal sheet 30 (the material head, the part where the standard deviation of the oil film thickness is greater than the threshold or the average value of the oil film thickness is greater than the threshold) usable for manufacturing a single finished product, the distance L between the end of the metal sheet 30 and the detection line is calculated according to the feeding speed of the metal sheet 30. Based on the distance L and the length of the single finished product, the next detection line is set. At this time, the next detection line is the second detection line, so that the length of the end material is the same as the length of the single finished product. In the oil replenishment step, the upper and lower surfaces of the end material and the cut position are replenished with oil to form a single finished product.

[0030] like Figure 4 As shown, when a single finished product is triangular or parallelogram-shaped, in the step of determining cutting parameters, when the standard deviation of the oil film thickness is less than the threshold and the average value of the oil film thickness is greater than the threshold, the detection line is the second detection line, and the end material is scrap.

[0031] The specific steps for determining the cutting parameters are as follows: When the standard deviation of the oil film thickness is less than the threshold and the average oil film thickness is greater than the threshold, the detection line is designated as the second detection line. The tool pressure and tool angle are determined based on the average oil film thickness on the second detection line. The tool 60 cuts along the second detection line on the metal sheet 30 to form the end piece. The tool pressure P = P0(1 + 0.15H), where P0 is the base pressure (the cutting pressure of the tool 60 when the metal sheet 30 is not coated with oil), and H is the average oil film thickness in μm. The tool angle is deflection α = A * H, where A is the deflection coefficient. The initial deflection coefficient is 1, which is adjusted in subsequent quality inspection steps.

[0032] The quality inspection step is located between the cutting parameter determination step and the dynamic adjustment step. Specifically, the quality inspection step involves: acquiring an image of the cut edge using an industrial camera; analyzing the edge burrs and cutting accuracy based on the image; and adjusting the deflection coefficient based on the edge burrs and cutting accuracy. In the step of adjusting the deflection coefficient based on edge burrs and cutting accuracy, the weight of cutting accuracy is greater than the weight of edge burrs.

[0033] Compared with existing technologies, the oil-coated metal sheet cutting method of the present invention involves the following steps: unwinding of the roll, equalizing the oil film, detecting the oil film thickness, adjusting the equalizing roller, determining cutting parameters, dynamic adjustment, and oil replenishment. The pressure of the equalizing roller 40 is adjusted according to the real-time detected oil film thickness. When the pressure of the equalizing roller 40 reaches a suitable level, the cutting parameters are determined again based on the real-time detected oil film thickness, and the sheet is cut into individual finished products. Finally, the individual finished products are replenished with oil. Through the above design, the impact of uneven oil film thickness on the processing of the metal sheet 30 is reduced.

[0034] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of these fall within the protection scope of the present invention.

Claims

1. A method for cutting oily metal sheets, characterized in that, Includes the following steps: Uncoiling: Uncoiling a rolled metal sheet to form a horizontal metal sheet, which moves along the conveying direction to facilitate cutting; Oil film equalization: An equalization roller is provided, which is located between the unwinding structure and the oil film thickness detection structure. The equalization roller contacts the metal sheet to make the oil film on the surface of the metal sheet uniform. Oil film thickness detection: The emitter of the oil film thickness detection structure emits infrared light to illuminate the metal plate. After passing through the oil film, part of the infrared light is absorbed and part is reflected back. The thickness of the oil film is measured by the change in infrared intensity, i.e., absorbance. There are multiple detection points along the width direction of the metal plate. These multiple detection points along the width direction of the metal plate form a detection line. The detection line has the same shape as the cutting path of the tool. The standard deviation and average value of the oil film thickness are calculated based on the oil film thickness at multiple detection points. Adjusting the equalizing roller: When the standard deviation of the oil film thickness is greater than the threshold or the average value of the oil film thickness is less than the threshold, the detection line is the first detection line. Adjust the pressure of the equalizing roller and repeat the oil film thickness detection until the standard deviation of the oil film thickness is less than the threshold and the average value of the oil film thickness is greater than the threshold. Cutting parameters are determined as follows: When the standard deviation of the oil film thickness is less than the threshold and the average value of the oil film thickness is greater than the threshold, the detection line is the second detection line. The tool pressure and tool angle are determined according to the average value of the oil film thickness on the second detection line. The tool cuts along the position of the second detection line on the metal sheet to form the end material. Dynamic adjustment: Continue to detect the oil film thickness on the metal sheet to form multiple second detection lines. The distance between two adjacent second detection lines is the length of a single finished product after the metal sheet is cut. Calculate the average oil film thickness of each second detection line. The pressure and angle of the cutter for each cut are calculated based on the average oil film thickness of the corresponding second detection line. Oil replenishment: Apply oil to the cut areas on both sides of the multiple individual finished products.

2. The method for cutting oily metal sheets according to claim 1, characterized in that: Along the length of the metal sheet, there are multiple first detection lines, and the distance between the first and last two first detection lines is less than the single length of the metal sheet after it has been cut.

3. The method for cutting oily metal sheets according to claim 2, characterized in that: The oil film thickness detection structure is located between the equalizing roller and the cutting structure, and the oil film thickness detection structure is close to the equalizing roller to reduce the distance between two adjacent first detection lines.

4. The method for cutting oily metal sheets according to claim 2, characterized in that: When the single finished product is rectangular or right-angled trapezoidal, in the cutting parameter determination step, when the standard deviation of the oil film thickness is less than the threshold and the average value of the oil film thickness is greater than the threshold, the distance L between the end of the metal sheet and the detection line is calculated according to the feeding speed of the metal sheet. Based on the distance L and the length of the single finished product, the next detection line is set. At this time, the next detection line is the second detection line, so that the length of the end material is the same as the length of the single finished product. In the oil replenishment step, the upper and lower surfaces of the end material and the cut position are replenished with oil to form a single finished product.

5. The method for cutting oily metal sheets according to claim 2, characterized in that: When the individual finished product is triangular or parallelogram-shaped, in the cutting parameter determination step, when the standard deviation of the oil film thickness is less than the threshold and the average value of the oil film thickness is greater than the threshold, the detection line is the second detection line and the end material is waste material.

6. The method for cutting oily metal sheets according to claim 1, characterized in that: In the step of determining the cutting parameters, the tool pressure P = P0(1 + 0.15H), where P0 is the base pressure, which is the cutting pressure of the tool when the metal sheet is not coated with oil, and H is the average oil film thickness in μm; the angle of the tool is the deflection α = A * H; where A is the deflection coefficient.

7. The method for cutting oily metal sheets according to claim 6, characterized in that: The method for cutting oily metal sheets also includes quality inspection. The quality inspection step is located between the cutting parameter determination step and the dynamic adjustment step. Specifically, the quality inspection step involves: acquiring an image of the cutting edge using an industrial camera, analyzing edge burrs and cutting accuracy based on the image, and adjusting the deflection coefficient based on the edge burrs and cutting accuracy.

8. The method for cutting oily metal sheets according to claim 7, characterized in that: In the step of adjusting the deflection coefficient based on the edge burrs and the cutting accuracy, the weight of the cutting accuracy is greater than the weight of the edge burrs.

9. The method for cutting oily metal sheets according to claim 1, characterized in that: In the step of adjusting the equalizing roller, when the standard deviation of the oil film thickness is greater than the threshold, the pressure of the equalizing roller is increased; when the average value of the oil film thickness is less than the threshold, the pressure of the equalizing roller is decreased.

10. The method for cutting oily metal sheets according to claim 1, characterized in that: In the oil film thickness detection step, the plurality of detection points on the detection line are evenly distributed along the width direction of the metal sheet.

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