A method for continuous production of multiple oil-coated metal coils

Abstract

This invention discloses a method for continuous production of multiple oil-coated metal coils, belonging to the field of sheet metal processing. Through steps such as uncoiling and straightening, cutting position planning, waste removal, splicing and welding, and cutting metal sheets, adjacent coils are connected, enabling continuous processing of the coils. Furthermore, there are no weld seams on the semi-finished metal sheets, maximizing the utilization of raw materials.

Description

TECHNICAL FIELD

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

[0002] To prevent rusting on the surface of cold-rolled metal coils during storage and transportation, which affects product performance and quality, oiling treatment is required on the surface of the metal plate to block water and oxygen contact and prevent electrochemical corrosion. The metal plate is oiled according to different customer requirements and standards, and then wound to form a coil for easy storage and transportation.

[0003] When the coil is processed, the coil material is first unwound to form a plate, and a layout diagram is designed according to the size of the plate and the size of the semi-finished metal plate. The semi-finished metal plate is punched from the plate according to the layout diagram. After the coil material is unwound to form a plate, the head and tail of the plate will be deformed more severely than the middle part of the plate due to winding, so the head and tail of the plate will still not meet the processing requirements after correction by a flattening machine, and need to be cut off.

[0004] In the prior art, the tail of the first plate and the head of the second plate are cut along a direction perpendicular to the edge of the material strip, the tail of the first plate after cutting is welded to the head of the next plate after cutting, and the plate is then cut to form a semi-finished metal plate to ensure the continuity and efficiency of production.

[0005] However, when the semi-finished metal plate is in the shape of a parallelogram, this cutting method will result in a weld on the semi-finished metal plate, which needs to be removed, or a long section around the weld will not be laid out, resulting in waste of raw materials. In addition, the oil on the surface of the oil-coated plate will vaporize under the action of laser during laser welding, resulting in an increase in the amount of metal particles flying and contaminating the surface of the plate and reducing the quality of the weld. SUMMARY

[0006] 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 plates, which can continuously process multiple oil-coated metal coils without welds on the semi-finished metal plates and save raw materials.

[0007] One of the purposes of the present application is achieved by using the following technical solutions:

[0008] A method for continuously producing multiple oil-coated metal coils, comprising the following steps:

[0009] Uncoiling and straightening: The rolled metal sheet is uncoiled and straightened by a leveling machine to form a horizontal metal sheet. The flatness of the sheet after straightening is measured, and the flatness of the tail area of ​​the first adjacent roll and the head area of ​​the second roll are obtained, thereby obtaining the location of the discarded area where the flatness does not meet the requirements.

[0010] Cutting position planning: The metal sheet to be cut is a parallelogram structure. Obtain the edge tilt angle of the metal sheet to be cut. Obtain the x-coordinate X of the position of the waste area of ​​the first roll closest to the cutter. The x-coordinate is along the length of the sheet. When the metal sheet to be cut is tilted towards the cutter, the first cutting line is formed at the bottom X of the first roll with the tilt angle of the metal sheet to be cut. When the metal sheet to be cut is tilted against the cutter, the first cutting line is formed at the top X of the first roll with the tilt angle of the metal sheet to be cut. Obtain the x-coordinate Y of the position of the waste area of ​​the second roll furthest from the cutter. When the metal sheet to be cut is tilted towards the cutter, the second cutting line is formed at the top Y of the second roll with the tilt angle of the metal sheet to be cut. When the metal sheet to be cut is tilted against the cutter, the second cutting line is formed at the bottom Y of the second roll with the tilt angle of the metal sheet to be cut.

[0011] Waste removal: The first cut line of the first roll is degreased, and the cutting head of the laser welding device cuts along the planned first cut line; the second cut line of the second roll is degreased, and the cutting head of the laser welding device cuts along the planned second cut line.

[0012] Joining and welding: The first cut line of the first roll and the second cut line of the second roll are joined to form a seam, and the cutting head of the laser welding device welds the seam;

[0013] Cutting metal sheets: Cut according to the preset layout diagram. When the area to be cut of the metal sheet includes the weld, add the preset allowance along the weld away from the cutter to form a new cutting line and cut the sheet with the weld to form the connecting waste.

[0014] Furthermore, in the assembly and welding step, the camera captures infrared images during welding, and the thermometer captures temperature signals during welding. The state of the molten pool during welding is determined based on the infrared images and temperature signals. When the molten pool temperature is lower than the preset temperature range, the output power of the laser welder is increased and / or the moving speed of the laser welder is decreased. When the molten pool temperature is higher than the preset temperature range, the output power of the laser welder is decreased and / or the moving speed of the laser welder is increased. When the molten pool temperature is within the preset temperature range, the current output power and the moving speed of the laser welder are maintained.

[0015] Furthermore, in the step of cutting the metal sheet, when cutting according to the preset layout diagram, firstly, a uniform roller is used to contact the metal sheet to make the oil film on the surface of the metal sheet uniform, then the thickness of the oil film is detected, and the cutting pressure and cutting angle are determined according to the thickness of the oil film.

[0016] Furthermore, the cutting according to the preset layout diagram also includes the step of adjusting the equalizing roller. The step of adjusting the equalizing roller specifically involves: there are multiple oil film thickness detection points, and the multiple oil film thickness detection points form a first detection line. When the standard deviation of the detected multiple oil film thicknesses is greater than a threshold or the average oil film thickness is less than a threshold, 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 the threshold and the average oil film thickness is greater than the threshold.

[0017] 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.

[0018] Furthermore, in the step of cutting the metal sheet, a allowance of 5mm-10mm is provided.

[0019] Furthermore, in the waste removal step, the degreasing treatment specifically involves removing the surface oil film using plasma cleaning or chemical degreasing, with the residual oil content controlled to <5mg / m².

[0020] Furthermore, the method for cutting oiled metal sheets also includes an oil replenishment step, which specifically involves replenishing oil on both sides of the cut positions of the multiple individual finished products.

[0021] Furthermore, in the splicing and welding step, after the first cutting line and the second cutting line are spliced ​​together, both the first roll and the second roll are pressed together by a pressure plate, and the melting point of the pressure plate is higher than that of the metal plate.

[0022] Furthermore, in the steps of removing waste and cutting metal sheets, the waste area and the connecting waste are pushed out by a pusher plate disposed on the side of the conveyor belt, and the pushing direction of the pusher plate is perpendicular to the conveying direction of the metal sheet.

[0023] Compared with the prior art, the oil-coated metal sheet cutting method of the present invention connects two adjacent rolls through steps such as uncoiling and straightening, cutting position planning, waste removal, splicing and welding, and cutting metal sheets, so that the rolls can be processed continuously and there are no welds on the semi-finished metal sheets, maximizing the utilization of raw materials. Attached Figure Description

[0024] Figure 1 This is a flowchart of the oil-coated metal sheet cutting method of the present invention;

[0025] Figure 2 This is a schematic diagram of the cutting of the first roll of material when the metal sheet is tilted towards the cutter.

[0026] Figure 3 This is a schematic diagram of the cutting of the first roll of material when the reverse cutter is tilted.

[0027] Figure 4 This is a schematic diagram of the cutting of the second roll of material when the metal sheet is tilted toward the cutter.

[0028] Figure 5 This is a schematic diagram of the cutting of the second roll of material when the metal sheet is tilted in the reverse direction. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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.

[0032] like Figure 1 As shown, the present invention provides a method for continuous production of multiple oil-coated metal coils, comprising the following steps:

[0033] Uncoiling and straightening: The rolled metal sheet is uncoiled and straightened by a leveling machine to form a horizontal metal sheet. The flatness of the sheet after straightening is measured, and the flatness of the tail area of ​​the first adjacent roll and the head area of ​​the second roll are obtained, thereby obtaining the location of the discarded area where the flatness does not meet the requirements.

[0034] Cutting position planning: The metal sheet to be cut is a parallelogram structure. Obtain the edge tilt angle of the metal sheet to be cut. Obtain the x-coordinate X of the position of the waste area of ​​the first roll closest to the cutter. The x-coordinate is along the length of the sheet. When the metal sheet to be cut is tilted towards the cutter, the first cutting line is formed at the bottom X of the first roll with the tilt angle of the metal sheet to be cut. When the metal sheet to be cut is tilted against the cutter, the first cutting line is formed at the top X of the first roll with the tilt angle of the metal sheet to be cut. Obtain the x-coordinate Y of the position of the waste area of ​​the second roll furthest from the cutter. When the metal sheet to be cut is tilted towards the cutter, the second cutting line is formed at the top Y of the second roll with the tilt angle of the metal sheet to be cut. When the metal sheet to be cut is tilted against the cutter, the second cutting line is formed at the bottom Y of the second roll with the tilt angle of the metal sheet to be cut.

[0035] Waste removal: The first cut line of the first roll is degreased, and the cutting head of the laser welding device cuts along the planned first cut line; the second cut line of the second roll is degreased, and the cutting head of the laser welding device cuts along the planned second cut line.

[0036] Joining and welding: The first cut line of the first roll and the second cut line of the second roll are joined to form a seam, and the cutting head of the laser welding device welds the seam;

[0037] Cutting metal sheets: Cut according to the preset layout diagram. When the area to be cut of the metal sheet includes the weld, add the preset allowance along the weld away from the cutter to form a new cutting line and cut the sheet with the weld to form the connecting waste.

[0038] The specific steps for correcting unread books are as follows:

[0039] The rolled metal sheet is unwound to form a horizontal sheet, which moves along the conveyor direction for cutting. After the roll is unwound to form a sheet, the head and tail of the sheet are deformed more severely than the middle due to the winding process. Therefore, even after being straightened by a leveling machine, the head and tail of the sheet may still have flatness that does not meet processing requirements and need to be cut off. The location of areas with flatness that does not meet processing requirements is determined by flatness measurement. In this embodiment, the sheet formed by two rolls along the sheet conveyor direction is designated as the first roll (closer to the cutter) and the sheet (farther from the cutter) (second sheet). Figure 2 as well asFigure 4 As shown, the end of the first roll is a waste area, and the beginning of the second roll is a waste area.

[0040] The specific steps for planning the cutting position are as follows:

[0041] The cut metal sheet has a parallelogram structure, therefore the cutter is angled, and the cutting line formed by the cutter is a diagonal line. Depending on the direction of the parallelogram's inclination, the cutting line can be either angled towards the cutter or angled away from the cutter. For example... Figure 2 As shown, the waste area of ​​the first roll is the tail section on the left. The metal sheet to be cut is tilted towards the cutter. The position of the waste area closest to the cutter is the dot shown in the diagram, with the horizontal coordinate of the dot being X. This X represents the distance from the tail end to the dot in the direction of sheet movement. At the bottom X of the first roll, a first cutting line is formed at the angle of the metal sheet to be cut. This allows the entire waste area to be removed, and the first cutting line to be parallel to the edge of the cut metal sheet, minimizing the area of ​​subsequent discarded connecting waste and effectively utilizing the raw materials. Figure 3 As shown, when the metal sheet to be cut is tilted away from the cutter, the location of the waste area closest to the cutter is the dot indicated in the figure. The horizontal coordinate of the dot is X, which is the distance from the end to the dot in the direction of sheet movement. At the top X of the first roll, a first cutting line is formed with the tilt angle of the metal sheet to be cut. This allows the entire waste area to be removed and makes the first cutting line parallel to the edge of the cut metal sheet, minimizing the area of ​​subsequent discarded connecting waste and effectively utilizing the raw materials.

[0042] Please continue reading. Figure 4 as well as Figure 5 The discarded area of ​​the second roll is the head area on the right end. For example... Figure 4 As shown, the metal sheet to be cut is tilted towards the cutter. The point furthest from the cutter in the waste area is the dot indicated in the diagram, with the horizontal coordinate of the dot being Y. This Y represents the distance from the beginning of the sheet to the dot in the direction of sheet movement. At the top Y of the second roll, a second cutting line is formed at the tilt angle of the metal sheet. This ensures that the entire waste area is removed and that the second cutting line is parallel to the edge of the cut metal sheet, minimizing the area of ​​subsequent discarded connecting waste and effectively utilizing the raw materials. Figure 5 As shown, when the metal sheet to be cut is tilted away from the cutter, the location of the waste area furthest from the cutter is the dot indicated in the figure. The horizontal coordinate of the dot is Y, which represents the distance from the beginning to the dot in the direction of sheet movement. At the bottom Y of the second roll, a second cutting line is formed at the tilt angle of the metal sheet to be cut. This allows the entire waste area to be removed, and the second cutting line to be parallel to the edge of the cut metal sheet, minimizing the area of ​​subsequent discarded connecting waste and effectively utilizing the raw materials.

[0043] The specific steps for removing waste are as follows:

[0044] The degreasing process involves removing the surface oil film using plasma cleaning or chemical degreasing, with the residual oil level controlled to <5mg / m². The cut waste material is ejected via push plates located on the side of the conveyor belt, with the push plate's ejection direction perpendicular to the conveying direction of the metal sheet.

[0045] The specific steps for assembly and welding are as follows:

[0046] After the first and second cutting lines are joined, both the first and second rolls of material are pressed together by a pressure plate, the melting point of which is higher than that of the metal sheet. During welding, a camera captures infrared images of the welding process, and a thermometer collects temperature signals. The state of the molten pool is determined based on the infrared images and temperature signals. When the molten pool temperature is lower than the preset temperature range, the output power of the laser welder is increased and / or the moving speed of the laser welder is decreased. When the molten pool temperature is higher than the preset temperature range, the output power of the laser welder is decreased and / or the moving speed of the laser welder is increased. When the molten pool temperature is within the preset temperature range, the current output power and the moving speed of the laser welder are maintained.

[0047] The specific steps for cutting metal sheets are as follows:

[0048] When cutting according to the preset layout, a leveling roller is first used to contact the metal sheet to make the oil film on the surface of the metal sheet uniform, and then the oil film thickness is measured. The purpose of leveling the oil film is to mitigate the unevenness of the oil layer caused by the storage of the metal coil, and reduce the difference in oil film thickness at different locations. At the same time, it prevents the oil film from being wiped off in some areas of the metal sheet due to handling and uncoiling, reducing the error of subsequent oil film thickness measurement. Specifically, the leveling roller is located between the uncoiling structure and the oil film thickness detection structure, and the contact between the leveling roller and the metal sheet makes the oil film on the surface of the metal sheet uniform. The initial pressure of the leveling roller in contact with the metal sheet is an empirical value, which is subsequently adjusted according to the standard deviation and average value of the oil film thickness of the oil film thickness detection structure. During the adjustment of the leveling roller pressure, the line connecting the detection points of the oil film thickness detection structure is the detection line. When the leveling roller pressure is too high, it will cause the oil film thickness to decrease. Therefore, when the average oil film thickness is less than the threshold, the leveling roller pressure is reduced. When the pressure of the equalizing roller 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.

[0049] In this embodiment, infrared light measurement technology is used. The emitter emits infrared light to illuminate 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 in the intensity of the infrared light, i.e., the absorbance.

[0050] The tool pressure and tool angle are determined based on the oil film thickness as follows: Tool pressure P = P0(1 + 0.15H), where P0 is the base pressure, which is the pressure applied by the tool when cutting the metal sheet without 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.

[0051] When the area to be cut in the metal sheet includes the weld seam, a new cutting line is formed along the weld seam away from the cutter, with a pre-set allowance. This new cutting line is diagonal and has the same angle as the cut metal sheet, forming the edge of the cut metal sheet. The allowance is 5mm-10mm to prevent the weld seam edge from affecting the quality of the cut metal sheet. The area with the weld seam after cutting is called connecting scrap, which is a parallelogram-shaped area with a width smaller than the width of the cut metal sheet. The connecting scrap is pushed out by a pusher plate located on the side of the conveyor belt, with the pusher plate's pushing direction perpendicular to the metal sheet's conveying direction.

[0052] The continuous production method for multiple oil-coated metal coils also includes an oil replenishment step, which specifically involves replenishing oil on both sides of the cut positions of multiple individual finished products.

[0053] Compared with the prior art, the continuous production method of multiple oily metal coils of the present invention connects two adjacent coils through steps such as uncoiling and straightening, cutting position planning, waste removal, splicing and welding, and cutting metal plates, so that the coils can be processed continuously and there are no welds on the semi-finished metal plates, maximizing the utilization of raw materials.

[0054] 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 of continuously producing a plurality of metal strips with oil, characterized by, The method comprises the following steps: Uncoiling and correcting: Uncoiling the coiled metal plate, correcting the coiled metal plate through a leveler to form a horizontal metal plate, measuring the flatness of the plate corrected by the leveler, obtaining the flatness of the tail area of the adjacent first coil and the flatness of the head area of the second coil, and obtaining the position of the waste area with non-conforming flatness; Cutting position planning: the to-be-cut metal plate is a parallelogram structure, the edge inclination angle of the to-be-cut metal plate is obtained, the horizontal coordinate X of the position closest to the cutter of the waste area position of the first coil is obtained, the horizontal coordinate is along the length direction of the plate, when the to-be-cut metal plate is inclined towards the cutter, a first cutting line is formed at the bottom X of the first coil at the inclination angle of the to-be-cut metal plate; when the to-be-cut metal plate is inclined away from the cutter, a second cutting line is formed at the top Y of the second coil at the inclination angle of the to-be-cut metal plate; Removing waste: performing oil removal treatment at the first cutting line of the first coil, and the cutting head of the laser welding device cuts according to the planned first cutting line; performing oil removal treatment at the second cutting line of the second coil, and the cutting head of the laser welding device cuts according to the planned second cutting line; Splicing and welding: splicing the first cutting line of the first coil and the second cutting line of the second coil to form a splicing seam, and the cutting head of the laser welding device welds the splicing seam; Cutting the metal plate: cutting according to the preset layout drawing, when the to-be-cut area of the metal plate to be formed includes a weld, a new cutting line is formed in the direction away from the cutter along the weld with a preset allowance, and the plate with the weld is cut down to form a connection waste.

2. The method of claim 1 wherein: In the splicing and welding step, the camera collects an infrared image during welding, the temperature measuring instrument collects a temperature signal during welding, the state of the molten pool during welding is judged according to the infrared image and the temperature signal; when the temperature of the molten pool is less than a preset temperature range, the output power of the laser welding device is increased and / or the moving speed of the laser welding device is reduced; when the temperature of the molten pool is greater than the preset temperature range, the output power of the laser welding device is reduced and / or the moving speed of the laser welding device is increased; when the temperature of the molten pool is within the preset temperature range, the current output power and the moving speed of the laser welding device are maintained.

3. The method of claim 1 wherein: In the cutting metal plate step, when cutting according to the preset layout drawing, the oil film on the surface of the metal plate is first made uniform by using the equalizing roller to contact the metal plate, then the oil film thickness is detected, and the tool pressure and tool angle are determined according to the oil film thickness.

4. The method of claim 3, wherein: The cutting according to the preset layout further comprises an adjusting equalizing roller step, specifically, the number of oil film thickness detection points is multiple, the multiple oil film thickness detection points form a first detection line, when the standard deviation of the detected multiple oil film thicknesses is greater than a threshold value or the average value of the oil film thickness is less than a threshold value, 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.

5. The method of claim 4, wherein: In the step of determining the cutter pressure and the cutter angle according to the oil film thickness, the cutter pressure P=P0(1+0.15H), wherein P0 is the basic pressure, the basic pressure is the cutter cutting pressure when the metal plate is not oiled, H is the average value of the oil film thickness, and the unit is μm; the angle of the cutter is deflection α=A*H; wherein A is the deflection coefficient.

6. The method of claim 1 wherein: In the cutting metal plate step, the reserved amount is 5mm-10mm.

7. The method of claim 1 wherein: In the waste removal step, the oil removal treatment specifically comprises: removing the surface oil film by plasma cleaning or chemical degreasing, and the residual oil amount needs to be controlled to be <5mg / m².

8. The method of claim 1 wherein: The multiple strip metal coil continuous production method further comprises an oil supplementing step, specifically, the two sides of the cut position of the multiple metal plates are oiled.

9. The method of claim 1 wherein: In the splicing welding step, after the first cutting line and the second cutting line are spliced, the first coil and the second coil are pressed by a pressing plate, and the melting point of the pressing plate is higher than the melting point of the metal plate.

10. The method of claim 1 wherein: In the waste removal and the cutting metal plate step, the waste area and the connecting waste are pushed out by a push plate arranged on the side of the conveying belt, and the pushing direction of the push plate is perpendicular to the conveying direction of the metal plate.

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