Method for cutting an oil-coated metal sheet

Abstract

The application discloses a cutting method for metal plate with oil, and belongs to the field of plate processing. The method comprises the following steps: coiling, uncoiling, balancing oil film, detecting oil film thickness, adjusting balancing roller, determining cutting parameters, dynamically adjusting and supplementing oil. The pressure of the balancing roller is adjusted according to the real-time detected oil film thickness. When the pressure of the balancing roller reaches the appropriate value, the cutting parameters are determined according to the real-time detected oil film thickness, and a single finished product is formed. Finally, the single finished product is supplemented with oil. Through the above design, the influence of uneven oil film thickness on metal plate processing is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to plate processing, in particular to a method for cutting oil-coated metal plate. BACKGROUND

[0002] In order to prevent the surface of the cold-rolled metal coil from rusting during storage and transportation, which affects the performance and quality of the product, oiling treatment needs to be performed on the surface of the metal plate to block the contact between water and oxygen and prevent electrochemical corrosion. According to the oiling operation of the metal plate required by different customers and standards, the metal plate is then wound to form a coil for storage and transportation.

[0003] During storage and transportation, the oil film on the surface of the metal coil will be affected by gravity, resulting in a phenomenon of thinning at the top and accumulation at the bottom, which leads to uneven thickness of the oil film on the surface of the metal coil.

[0004] Since the oil film reduces the friction coefficient between the roller and the plate during cutting, uneven thickness of the oil film on the metal surface has a great influence on plate forming processing, affecting the cutting accuracy of the plate and the generation of burrs. Although there are methods for measuring the thickness of the oil film in the prior art, the oil film on the surface of the metal plate is treated as a fixed value after measurement, without considering the influence of uneven thickness of the oil film on plate forming processing. SUMMARY

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

[0006] One of the purposes of the present application is achieved by adopting the following technical solutions:

[0007] A method for cutting oil-coated metal plate, comprising the following steps:

[0008] Unwinding the coil: unwinding the wound metal plate to form a horizontal metal plate, and moving the metal plate along the conveying direction to facilitate cutting;

[0009] Balancing the oil film: setting a balancing roller between the unwinding structure and the oil film thickness detection structure, the balancing roller being in contact with the metal plate to make the oil film on the surface of the metal plate uniform;

[0010] Detecting the thickness of the oil film: the light emitter of the oil film thickness detection structure emits infrared light to irradiate the metal plate, after passing through the oil film, part of the infrared light is absorbed and part of it is reflected back, the thickness of the oil film is measured by the change of the intensity of the infrared light, i.e. the absorbance, the detection points of the thickness of the oil film are multiple along the width direction of the metal plate, the 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 cutter, and the standard deviation of the oil film thickness and the average value of the oil film thickness are calculated according to the oil film thickness of the multiple detection points;

[0011]

[0011] Adjusting the equalizing roller: when the oil film thickness standard deviation is greater than a threshold value or the oil film thickness average value is less than a threshold value, at this time the detection line is the first detection line, adjusting the pressure of the equalizing roller, and repeating the oil film thickness detection until the oil film thickness standard deviation is less than a threshold value and the oil film thickness average value is greater than a threshold value;

[0012] Cutting parameter determination: when the oil film thickness standard deviation is less than a threshold value and the oil film thickness average value is greater than a threshold value, at this time the detection line is the second detection line, determining the cutter pressure and the cutter angle according to the oil film thickness average value on the second detection line, and the cutter cuts the metal plate along the position of the second detection line to form an end material;

[0013] Dynamic adjustment: continuing to detect the oil film thickness on the metal plate to form a plurality of second detection lines, the distance between adjacent two second detection lines is the length of a single finished product after being cut, calculating the oil film thickness average value of each second detection line, and the pressure and the cutter angle of each cutting of the cutter are calculated according to the oil film thickness average value of the corresponding second detection line;

[0014] Oil supplementing: supplementing oil to the cutting positions on both sides of a plurality of single finished products.

[0015] Further, the number of first detection lines is a plurality along the length direction of the metal plate, and the distance between the first and last first detection lines is less than the length of a single product after being cut.

[0016] Further, 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 adjacent two first detection lines.

[0017] Further, when the single finished product is a rectangle or a right trapezoid, in the cutting parameter determination step, when the oil film thickness standard deviation is less than a threshold value and the oil film thickness average value is greater than a threshold value, calculating the distance L between the end of the metal plate and the detection line according to the feeding speed of the metal plate, setting the next detection line according to the distance L and the length of the single finished product, at this time the next detection line is the second detection line, making the length of the end material the same as the length of the single finished product, and in the oil supplementing step, supplementing oil to the upper and lower surfaces and the cutting positions of the end material to form a single finished product.

[0018] Further, when the single finished product is a triangle or a parallelogram, in the cutting parameter determination step, when the oil film thickness standard deviation is less than a threshold value and the oil film thickness average value is greater than a threshold value, the detection line is the second detection line, and the end material is waste.

[0019] Further, in the cutting parameter determining step, the tool pressure P=P0(1+0.15H), wherein P0 is a basic pressure, the basic pressure is the tool cutting pressure when the metal plate is not oiled, H is the average value of the oil film thickness, the unit is μm; the angle of the tool is deflection a=A*H; wherein A is the deflection coefficient.

[0020] Further, the oiled metal plate cutting method further comprises a quality detection, the quality detection step is located between the cutting parameter determining step and the dynamic adjustment step, and the quality detection step specifically comprises: an industrial camera acquires an image of a cutting edge, analyzes edge burrs and cutting accuracy of the cutting edge according to the image, and adjusts the deflection coefficient according to the edge burrs and the cutting accuracy.

[0021] Further, in the step of adjusting the deflection coefficient according to the edge burrs and the cutting accuracy, the weight of the cutting accuracy is greater than the weight of the edge burrs.

[0022] Further, in the step of adjusting the equalizing roller, when the standard deviation of the oil film thickness is greater than a threshold value, the pressure of the equalizing roller is increased; and when the average value of the oil film thickness is less than a threshold value, the pressure of the equalizing roller is reduced.

[0023] Further, in the oil film thickness detection step, a plurality of detection points on the detection line are uniformly distributed along the width direction of the metal plate.

[0024] Compared with the prior art, the oiled metal plate cutting method of the present application comprises the steps of coiling, equalizing the oil film, detecting the oil film thickness, adjusting the equalizing roller, determining the cutting parameter, dynamically adjusting, and supplementing oil, the pressure of the equalizing roller is adjusted according to the real-time detected oil film thickness, when the pressure of the equalizing roller is appropriate, the cutting parameter is determined according to the real-time detected oil film thickness, a single finished product is formed by cutting, and finally the single finished product is supplemented with oil, through the above design, the influence of uneven oil film thickness on metal plate processing is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The flowchart of the oiled metal plate cutting method of the present application;

[0026] Figure 2 The schematic diagram of the oiled metal plate cutting method of the present application;

[0027] Figure 3 The oil film thickness detection schematic diagram when the single finished product is a rectangle;

[0028] Figure 4 The oil film thickness detection schematic diagram when the single finished product is a parallelogram.

[0029] 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

[0030] 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.

[0031] 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.

[0032] 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.

[0033] like Figures 1 to 2 As shown, the method for cutting oily metal sheets according to the present invention includes the following steps:

[0034] Uncoiling: Uncoiling a rolled metal sheet to form a horizontal metal sheet, which moves along the conveying direction to facilitate cutting;

[0035] 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.

[0036] Oil film thickness detection: the light emitter of the oil film thickness detection structure emits infrared light to the metal plate, after the infrared light passes through the oil film, part of it is absorbed and part of it is reflected back, the thickness of the oil film is measured by the change of infrared intensity, i.e. absorbance, the detection points of the oil film thickness are multiple along the width direction of the metal plate, the multiple detection points along the width direction of the metal plate form a detection line, the detection line is the same as the cutting path shape of the cutter, and the oil film thickness standard deviation and the oil film thickness average value are calculated according to the oil film thickness of the multiple detection points;

[0037] Adjusting the equalizing roller: when the oil film thickness standard deviation is greater than the threshold value or the oil film thickness average value is less than the threshold value, at this time the detection line is the first detection line, the pressure of the equalizing roller is adjusted, and the oil film thickness detection is repeated until the oil film thickness standard deviation is less than the threshold value and the oil film thickness average value is greater than the threshold value;

[0038] Cutting parameter determination: when the oil film thickness standard deviation is less than the threshold value and the oil film thickness average value is greater than the threshold value, at this time the detection line is the second detection line, the cutter pressure and the cutter angle are determined according to the oil film thickness average value on the second detection line, and the cutter cuts along the second detection line on the metal plate to form an end material;

[0039] Dynamic adjustment: the oil film thickness detection is continued on the metal plate to form multiple second detection lines, the distance between adjacent two second detection lines is the length of a single finished product after being cut, the oil film thickness average value of each second detection line is calculated, and the pressure and the angle of the cutter for each cutting are calculated according to the oil film thickness average value of the corresponding second detection line;

[0040] Oil supplement: the cutting positions on both sides of multiple single finished products are supplemented with oil.

[0041] In the cutting method of the metal plate with oil, the initial material is a metal coil 10, the metal coil 10 is a metal stored in a roll, and oil is coated on the surface of the metal to avoid oxidation and rust during storage. However, due to gravity, the distribution of the oil on the surface of the metal changes during storage, specifically, the oil layer on the top surface of the metal becomes thin, and the oil layer on the bottom surface of the metal becomes thick, resulting in uneven oil layer on the surface of the metal.

[0042] The unwinding step of the coil is specifically: the wound metal coil 10 is unwound into a straight metal plate 30 through an unwinding structure 20. The metal plate 30 moves along the arrow direction on the conveying structure. Figure 2

[0043] ​The role of the equalizing oil film step is to weaken the uneven condition of the oil layer caused by the storage of the metal coil 10 and reduce the thickness difference of the oil film at different positions. At the same time, it prevents the oil film at some positions of the metal plate 30 from being erased due to handling and uncoiling, thereby reducing the error of subsequent oil film thickness measurement. Specifically, the equalizing roller 40 is located between the uncoiling structure 20 and the oil film thickness detection structure 50, and the equalizing roller 40 contacts the metal plate 30 to make the oil film on the surface of the metal plate 30 uniform. The initial pressure of the equalizing roller 40 in contact with the metal plate 30 is an empirical value, and the subsequent adjustment is based on the oil film thickness standard deviation and the oil film thickness average value of the oil film thickness detection structure 50. During the pressure adjustment of the equalizing roller 40, the connecting line of the detection points of the oil film thickness detection structure 50 is the first detection line. When the pressure of the equalizing roller 40 is too large, it will cause the oil film thickness to decrease, so when the oil film thickness average value is less than a threshold value, the pressure of the equalizing roller 40 is reduced. When the pressure of the equalizing roller 40 is too small, it cannot weaken the uneven condition of the oil layer or the adjustment amount is too small, so the oil film thickness standard deviation is large at this time, and therefore when the oil film thickness standard deviation is greater than a threshold value, the pressure of the equalizing roller is increased.

[0044] The purpose of the oil film thickness detection step is to detect the surface oil film thickness of the metal plate 30 in real time in order to adjust the pressure of the equalizing roller 40 and the cutting parameters of the cutter 60. The oil film thickness detection is along the width direction of the metal plate 30, and the detection points are multiple, which are uniformly 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 plate 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 plate 30, but also needs to be the same as the cutting path of the cutter 60 (the extension 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 is the same group of structures, the connecting line of the multiple detection points of the oil film thickness detection structure 50 is uniformly along the width direction of the metal plate 30 and the same as the cutting path of the cutter 60 (the extension direction of the cutter).

[0045] In this embodiment, the infrared light measurement technology is used, the light emitter emits infrared light to irradiate the metal plate 30, and the infrared light, after passing through the oil film, part of it is absorbed and part of it is reflected back. The thickness of the oil film is measured by the change of the infrared intensity, i.e. the absorbance. The oil film thickness standard deviation and the oil film thickness average value are calculated according to the oil film thickness of the multiple detection points.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The quality detection step is between the cutting parameter determination step and the dynamic adjustment step, and the quality detection step specifically comprises: an industrial camera acquires an image of the cutting edge, analyzes the edge burr and cutting accuracy of the cutting edge according to the image, and adjusts the deflection coefficient according to the edge burr and cutting accuracy. In the step of adjusting the deflection coefficient according to the edge burr and cutting accuracy, the weight of the cutting accuracy is greater than the weight of the edge burr.

[0051] Compared with the prior art, the oil-coated metal plate cutting method of the present application comprises the steps of coiling, balancing the oil film, detecting the oil film thickness, adjusting the balancing roller, determining the cutting parameters, dynamically adjusting, and oiling, the pressure of the balancing roller 40 is adjusted according to the real-time detected oil film thickness, when the pressure of the balancing roller 40 reaches the appropriate value, the cutting parameters are determined according to the real-time detected oil film thickness, the single finished product is cut, and finally the single finished product is oiled, through the above design, the influence of the uneven oil film thickness on the metal plate 30 processing is reduced.

[0052] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are equivalent modifications and evolutions of the above embodiments according to the essential technical of the present application, and these all belong to the protection scope of the present application.

Claims

1. An oil-coated metal sheet cutting method characterized by comprising: The method comprises the following steps: coiling: the coiled metal plate is uncoiled to form a horizontal metal plate, which moves in the conveying direction to facilitate cutting; equalizing the oil film: an equalizing roller is arranged between the uncoiling structure and the oil film thickness detection structure, and the equalizing roller is in contact with the metal plate to make the oil film on the surface of the metal plate uniform; oil film thickness detection: the light emitter of the oil film thickness detection structure emits infrared light to irradiate the metal plate, a part of the infrared light is absorbed and a part is reflected back after passing through the oil film, the thickness of the oil film is measured by the change of the infrared intensity, i.e. the absorbance, the detection points of the oil film thickness are multiple along the width direction of the metal plate, the 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 cutter, the standard deviation of the oil film thickness and the average value of the oil film thickness are calculated according to the multiple detection points; adjusting the equalizing roller: when the standard deviation of the oil film thickness is greater than a threshold value or the average value of the oil film thickness is less than a threshold value, at this time the detection line is a first detection line, the pressure of the equalizing roller is adjusted, and the oil film thickness detection is repeated until the standard deviation of the oil film thickness is less than a threshold value and the average value of the oil film thickness is greater than a threshold value; cutting parameter determination: when the standard deviation of the oil film thickness is less than a threshold value and the average value of the oil film thickness is greater than a threshold value, at this time the detection line is a second detection line, the cutter pressure and the cutter angle are determined according to the average value of the oil film thickness on the second detection line, the cutter cuts along the position of the second detection line on the metal plate to form an end material; dynamic adjustment: the oil film thickness detection continues on the metal plate to form multiple second detection lines, the distance between two adjacent second detection lines is the length of a single finished product after cutting, the average value of the oil film thickness of each second detection line is calculated, and the pressure and the angle of the cutter for each cutting are calculated according to the average value of the oil film thickness of the corresponding second detection line; oil supplement: the cutting positions on both sides of multiple single finished products are supplemented with oil.

2. The method of claim 1, wherein: The number of first detection lines is multiple along the length direction of the metal plate, and the distance between the first detection line at the head and the first detection line at the tail is less than the length of a single product after cutting.

3. The method according to claim 2, wherein: The oil film thickness detection structure is located between the equalizing roller and the cutting structure and is close to the equalizing roller to reduce the distance between two adjacent first detection lines.

4. The method of claim 2, wherein: When the single finished product is rectangular or right trapezoidal, in the cutting parameter determination step, when the standard deviation of the oil film thickness is less than a threshold value and the average value of the oil film thickness is greater than a threshold value, the distance L between the end of the metal plate and the detection line is calculated according to the feeding speed of the metal plate, the next detection line is set according to the distance L and the length of the single finished product, at this time the next detection line is a second detection line, the length of the end material is the same as the length of the single finished product, and in the oil supplement step, the upper and lower surfaces of the end material and the cutting positions are supplemented with oil to form a single finished product.

5. The method of claim 2 wherein: When the single finished product is a triangle or parallelogram, in the cutting parameter determination step, when the oil film thickness standard deviation is less than a threshold value and the oil film thickness average value is greater than a threshold value, the detection line is a second detection line, and the end material is waste.

6. The method of claim 1 wherein: In the cutting parameter determination step, the cutter pressure P = P0(1 + 0.15H), wherein P0 is a basic pressure, the basic pressure being the cutter cutting pressure when the metal plate is not oiled, and H is the oil film thickness average value, in units of μm; the angle of the cutter is deflection α = A*H; wherein A is a deflection coefficient.

7. The method according to claim 6, wherein: The strip-oiled metal plate cutting method further comprises a quality detection step, which is located between the cutting parameter determination step and the dynamic adjustment step, and specifically comprises: an industrial camera acquiring an image of a cutting edge, analyzing edge burrs and cutting accuracy according to the image, and adjusting the deflection coefficient according to the edge burrs and cutting accuracy.

8. The method according to claim 7, wherein: In the step of adjusting the deflection coefficient according to the edge burrs and cutting accuracy, the weight of the cutting accuracy is greater than the weight of the edge burrs.

9. The method of claim 1 wherein: In the step of adjusting the equalizing roller, when the oil film thickness standard deviation is greater than a threshold value, the pressure of the equalizing roller is increased; and when the oil film thickness average value is less than a threshold value, the pressure of the equalizing roller is decreased.

10. The method of claim 1 wherein: In the oil film thickness detection step, a plurality of detection points on the detection line are uniformly distributed along the width direction of the metal plate.

Images