Side Trimmer Device, Method for Side Trimming a Metal Strip, and Method for Manufacturing a Metal Strip

Abstract

To more stably suppress the fluttering of a plate in a case of cutting with a trimmer blade.SOLUTION: A side trimmer device that continuously cuts an end in the width direction of a steel plate 40 with a rotary blade 1 includes: an edge grasping tool 2 which grasps a plate end part by sandwiching a width direction end of the steel plate 40 with pressure rolls that form a pair in the plate thickness direction at the upstream side position in the cutting direction relative to the rotary blade 1; and a width direction position adjustment mechanism which adjusts the position of grasping by the edge grasping tool 2 by displacing the plate width position of at least one of the pressure rolls 2A, 2B constituting the edge grasping tool 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a side trimmer device, a method for side trimming a metal strip, and a method for manufacturing a metal strip, which enable a side trimmer with higher precision.

Background Art

[0002] For example, in a steel plate manufacturing line or the like, both ends (edge portions) of a steel plate (metal strip) conveyed along a pass line are continuously trimmed by a side trimmer device. By this trimming, the steel plate is manufactured as a product having a required dimensional width, for example. Also, trimming may be performed for shaping the ends.

[0003] At this time, there is also a case where a high-tensile steel plate (high-tensile steel) having a tensile strength of 590 MPa or more is used as a target material, and its ends are continuously trimmed to manufacture a steel plate as a product. In this case, if simply trying to trim with a trimmer blade, fluttering occurs in the continuously conveyed plate. Also, due to the friction between the trimmer blade and the shearing portion of the steel plate, chipping is likely to occur on the trimmer blade. Continuing cutting with a trimmer blade having chipping will result in a defective steel plate width. This leads to the problem that sudden blade replacement of the trimmer blade becomes necessary.

[0004] As a countermeasure against the above problems, for example, there are the methods described in Patent Document 1 and Patent Document ②. Patent Document 1 describes providing a plurality of sets of pressing roll sets including an upper pressing roll and a lower pressing roll between a pair of knives arranged to face each other in the plate width direction. Patent Document 1 describes that with this configuration, warping and deflection of the plate in the plate width direction occurring during cutting can be prevented, and the plate width accuracy after trimming can be significantly improved.

[0005] In Patent Document 2, a plate pressing roll for pressing the steel plate edge portion at a position inward in the plate width direction of the knife is directly provided on the side trimmer. In Patent Document 2, it is possible to hold the steel plate near the cutting portion by the above pressing roll so that the plate does not flutter.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0007] Patent Document 1 shows a plate pressing device independent of the side trimmer for the side trimmer section. However, it is not possible to make all three upper pressing rolls provided between the left and right knives variable in the width direction. Specifically, in Patent Document 1, when trimming a narrow steel plate, the two rolls on both sides are not used, and only the center pressing roll is used. Therefore, in Patent Document 1, it is not possible to press the steel plate edge portion during trimming of a narrow steel plate, and there is a high risk of chipping due to fluttering.

[0008] Further, in Patent Document 2, a roll for pressing the plate is arranged inside the trimmer, but the trim portion of the steel plate cannot be completely pressed. In addition, the plate pressing roll is directly installed on the trimmer body, and the plate pressing roll is not an independent mechanism from the trimmer body. Therefore, in Patent Document 2, there is no space for installing an oiling device for directly reducing the friction coefficient between the blade and the steel plate as well as the fluttering of the plate, and chipping cannot be completely eliminated.

[0009] The present invention has been made paying attention to the above points, and an object thereof is to more stably suppress the fluttering of the plate during cutting by the trimmer blade.

Means for Solving the Problem

[0010] To solve the problem, one aspect of the present invention is a side trimmer device for continuously cutting the widthwise end of a metal strip with a trimmer blade. An edge gripper that grips the plate end by sandwiching the widthwise end of the metal strip with a pair of pressing rolls in the plate thickness direction at a position upstream of the trimmer blade in the cutting direction, and at least one of the pressing rolls constituting the edge gripper. A widthwise position adjustment mechanism that adjusts the gripping position by the edge gripper by displacing the plate width position of the pressing roll.

Advantages of the Invention

[0011] According to an aspect of the present invention, it is gripped by an edge gripper that sandwiches the upstream position of the cutting position. Therefore, even if the plate width of the target metal strip changes, the distance from the cutting position to the edge gripper does not change, and it is possible to stably suppress the fluttering of the plate. In addition, the gripping position by the edge gripper can be adjusted according to the plate width. As a result, according to an aspect of the present invention, it is possible to surely grip the appropriate position of the plate end. Therefore, it is possible to more surely suppress the fluttering of the plate during cutting with the trimmer blade. And by suppressing the fluttering of the plate, chipping of the trimmer blade can be suppressed.

[0012] Also, when lubricating oil is directly applied to the edge portion of the metal strip upstream of the cutting position, it becomes possible to more surely supply lubricating oil to the trimmer blade. In this case, it is possible to further reduce the friction between the blade and the metal strip such as a steel plate, and chipping of the trimmer blade can be further suppressed.

Brief Description of the Drawings

[0013] [Figure 1] It is a schematic side view illustrating a side trimmer device according to an embodiment based on the present invention. [Figure 2] It is a top view for explaining the arrangement configuration of each part. [Figure 3]This is a diagram for explaining a width direction position adjustment mechanism for adjusting the gripping position.

Embodiments for Carrying Out the Invention

[0014] Next, embodiments of the present invention will be described with reference to the drawings. In this embodiment, a steel plate is exemplified as the metal strip. The metal strip is not limited to a steel plate. Further, in this embodiment, the side trimmer equipment on the surface treatment steel plate production line in steel plate production will be described as an example. The present invention can also be applied to a rolling steel plate manufacturing factory such as a cold-rolled steel plate or a hot-rolled steel plate. The present invention is applicable to, for example, a steel plate production line.

[0015] "Regarding the steel plate to be processed" The metal strip targeted by the present invention is not particularly limited. This embodiment is also applicable when the steel plate to be processed is a high-tensile steel plate, particularly a high-tensile steel plate with a tensile strength of 590 MPa or more and a plate thickness of 0.4 mm or more. This embodiment may be applied to, for example, a high-tensile steel plate with a plate thickness of 4.0 mm or less.

[0016] Examples of steel plates cut by the rotary blade constituting the trimmer blade include GI, GA, EG, CRS, tin-plated steel plates, Zn-based plated steel plates, Al-based plated steel plates, etc. However, the steel plate is not limited thereto and is applicable to any steel plate. This embodiment is also applicable to, for example, a steel plate with a solid lubricating film applied to GI or GA or a steel plate with an organic coating.

[0017] Here, when the inventors investigated, it was also found that when cutting a high-tensile steel plate with a tensile strength of 1180 MPa or more, there is a new problem that trim defective materials due to chipping occur at a high frequency. In this case, offline re-trimming of the defective materials is required. In response to this problem, when the present disclosure is applied, it was confirmed that the occurrence rate of trim defects can be significantly reduced even in high-tensile steel plates of 1180 MPa grade or 1470 MPa grade and steel plates with a plate thickness of 0.4 mm or more, where significant occurrence of trim defects due to chipping had occurred conventionally.

[0018] (Configuration) Figures 1 and 2 are diagrams for explaining the configuration of a side trimmer device provided in a steel plate manufacturing apparatus. As shown in FIGS. 1 and 2, in this embodiment, for example, a steel plate 40 subjected to plating or other surface treatment is conveyed to the side trimmer device along a conveyance line (pass line), and trimming processing is continuously executed on the edge portions in the plate width direction of the steel plate 40 being conveyed. In this embodiment, it is assumed that both end portions in the plate width direction are cut simultaneously. The side trimming device of this embodiment includes a rotary blade 1, a plate pressing tool, and a lubricating oil adhesion device 6.

[0019] <Rotary blade 1> The rotary blade 1 constitutes a trimmer blade for cutting the edge portion in the width direction of the steel plate 40. As shown in FIGS. 1 and 2, the rotary blade 1 has a pair of rotary blades 1A and 1B (upper blade 2A and lower blade 2B) that can face each other with the steel plate 40 interposed therebetween. And it is configured to sandwich and cut the steel plate 40 from the plate thickness direction with the pair of rotary blades 1A and 1B. As shown in FIG. 2, the contact position between the cutting edges of the pair of rotary blades 1A and 1B becomes the cutting position.

[0020] Reference symbol L in FIG. 2 indicates the position of the steel plate 40 before cutting (upstream in the cutting direction) that is assumed to pass through the cutting position on the upstream side in the cutting direction. Also, reference symbol 30 in FIG. 2 exemplifies the position of the lubricating oil adhered to the steel plate 40 by the lubricating oil adhesion device 6.

[0021] The pair of rotary blades 1A and 1B are set, for example, in the forward direction in which the rotation direction at the cutting position is the same as the conveyance direction of the plate.

[0022] [Constituent materials of the rotary blade 1] The constituent material of the rotary blade 1 is not particularly defined. Examples of the constituent material of the rotary blade 1 include carbon tool steel, alloy tool steel, high-speed tool steel, etc. From the viewpoint of stably suppressing chipping during cutting of a high-tensile steel plate with a tensile strength of 1180 MPa or more, it is preferable to use alloy tool steel or high-speed tool steel as the constituent material of the rotary blade 1. Further, it is more preferable that the surface of the rotary blade 1 is subjected to surface hardening treatment such as quenching, nitriding / carburizing, TD treatment, etc., or surface coating treatment such as PVD, CVD, plating, thermal spraying, etc.

[0023] For example, before the outgoing inspection, the rotary blade 1 performs a trimming process of cutting the edge portion (end portion) of the steel plate 40 according to the product width.

[0024] [Clearance between the upper blade 2A and the lower blade 2B of the rotary blade 1] The clearance between the upper blade 2A and the lower blade 2B of the rotary blade 1 is preferably in the range of 5% or more and 19% or less with respect to the plate thickness of the steel plate 40. In the cutting of a high-tensile steel plate with a tensile strength of 590 MPa or more, chipping is likely to occur with a clearance of about 20% which was not a problem for conventional soft steel plates. By controlling the clearance between the upper blade 2A and the lower blade 2B of the rotary blade 1 in the range of 5% or more and 19% or less, even in the cutting of a high-tensile steel plate with a tensile strength of 590 MPa or more, trimming chipping and the resulting generation of iron powder are suppressed. As a result, pressing defects in the processes after cutting are suppressed. The clearance between the upper blade 2A and the lower blade 2B of the rotary blade 1 is more preferably in the range of 5% or more and 14% or less from the viewpoint of suppressing chipping of a high-tensile steel plate with a tensile strength of 980 MPa or more. Further, from the viewpoint of suppressing chipping of a high-tensile steel plate with a tensile strength of 1180 MPa or more, the range of 5% or more and 13% or less is more preferable.

[0025] [Vertical contact angle between the upper blade 1A of the rotary blade 1 and the steel plate 40 in the rotation direction of the rotary blade 1] The vertical contact angle between the upper blade 2A and the steel plate 40 in the rotational direction of the rotary blade 1 is preferably 3 degrees or more and 13 degrees or less. In the cutting of high-tensile steel plates with a tensile strength of 590 MPa or more, chipping is likely to occur at a contact angle of about 14 degrees, which was not a problem with conventional soft steel plates 40. When the contact angle exceeds 13 degrees, in addition to the decrease in the contact area between the rotary blade 1 and the steel plate 40, it becomes necessary to apply bending deformation to the cutting chips, increasing the deformation resistance. As a result, in the cutting of high-tensile steel plates, extremely high stress concentrates on the cutting edge of the rotary blade 1, and chipping becomes apparent. When the contact angle is less than 3 degrees, sufficient cutting depth cannot be ensured in the plate thickness direction, resulting in cutting defects. By controlling the contact angle within the range of 3 degrees or more and 13 degrees or less, chipping of the rotary blade 1 and the generation of iron powder due to it can be suppressed, and pressing marks can be suppressed even in the cutting of high-tensile steel plates with a tensile strength of 590 MPa or more.

[0026] [The angle formed by the rotational direction of the rotary blade 1 and the conveying direction of the steel plate 40] The angle formed by the rotational direction of the rotary blade 1 and the conveying direction of the steel plate 40 is preferably 0.01 degrees or more and 0.5 degrees or less in the direction of the opening angle on the rear side of the conveyance. In the cutting of high-tensile steel plates with a tensile strength of 590 MPa or more, high surface pressure is generated due to the re-contact of the cutting end face between the rotary blade 1 and the steel plate 40, and deposits of adherends are likely to occur on the cutting edge. When deposits of adherends occur on the cutting edge, large stress is applied to the cutting edge through the narrowing of the local clearance, inducing chipping. From the perspective of avoiding such a phenomenon, the angle formed by the rotational direction of the rotary blade 1 and the conveying direction of the steel plate 40 is preferably 0.01 degrees or more and 0.5 degrees or less in the direction of the opening angle on the rear side of the conveyance.

[0027] <Lubricating oil applying device 6> As shown in FIG. 1, the lubricating oil applying device 6 is arranged at a position upstream in the cutting direction from the installation position of the rotary blade 1 in the steel plate advancing direction, that is, at a position where it can face the surface of the steel plate 40 before cutting. As shown in FIG. 2, the lubricating oil applying device 6 is a device for pre-applying lubricating oil 30 to the region on the surface of the steel plate 40 including the position (position of symbol L) cut by the rotary blade 1.

[0028] In this embodiment, the case where the lubricating oil 30 adheres to the upper surface of the steel sheet 40 is illustrated, but the lubricating oil 30 may also adhere to the lower surface of the steel sheet 40.

[0029] The lubricating oil adhesion device 6 of this embodiment is composed of, for example, a spraying device (spray nozzle). The spraying device adheres the lubricating oil to the surface of the steel sheet 40 by spraying the lubricating oil toward the surface of the steel sheet 40. An oil tank (not shown) storing the lubricating oil and a compressor or other air supply device (not shown) for supplying air are connected to the spraying device. The spraying device mixes air with the lubricating oil at the tip of the nozzle, for example, in response to a command from a controller. As a result, the spraying device is configured to atomize the lubricating oil and spray the atomized lubricating oil toward the surface of the steel sheet 40.

[0030] [Water content of lubricating oil] The water content of the lubricating oil is preferably less than 3000 ppm. Here, the lubricating oil remains attached to the end of the steel sheet 40 after cutting by the rotary blade 1. When the water content of the attached lubricating oil is 3000 ppm or more and the water content is high, rust may occur on the flat surface or the cut surface of the steel sheet 40 due to the water contained in the lubricating oil from the cutting by the rotary blade 1 until the steel sheet 40 is processed into a product by an automobile manufacturer, a home appliance manufacturer, or the like. This leads to the difficulty of using this embodiment in the manufacture of steel sheets for automotive and home appliance applications.

[0031] On the other hand, by setting the water content of the lubricating oil to less than 3000 ppm, the generation of rust on the flat surface or the cut surface of the steel sheet 40 can be suppressed.

[0032] From the viewpoint of suppressing the generation of rust over a longer period, the water content of the lubricating oil is more preferably 2000 ppm or less. Also, the lower limit of the water content of the lubricating oil is 0 ppm. Considering the cost required for dehydration, the lower limit of the water content of the lubricating oil is preferably 20 ppm or more. Note that "ppm" in this specification represents weight ppm.

[0033] [Spray amount] The spray amount is synonymous with the adhesion amount of the lubricating oil 30 to the steel plate surface. In manufacturing manufacturers that process steel plates 40 such as the automobile manufacturing industry, for example, after subjecting the steel plate 40 or a blank material trimmed from the steel plate 40 to press working, before the chemical conversion treatment and electrodeposition coating processes, a cleaning process is provided to degrease the oil (press oil or rust preventive oil) adhering to the steel plate 40 with an alkaline cleaning liquid. At this time, the greater the amount of oil adhesion, the more significantly the degreasing property deteriorates in the degreasing process, and it has an adverse effect on the chemical conversion treatment property and the coating property. Therefore, when manufacturing steel plates 40 for such applications, in the conventional case, the following problems may occur. That is, in the method of directly applying oil to the rotary blade 1 and cutting the steel plate 40, supplying a larger amount of cutting oil may cause excessive transfer of oil from the rotary blade 1 to the steel plate 40, leading to poor degreasing.

[0034] On the other hand, as a result of various studies by the inventors, when adopting the method of directly applying (adhering) lubricating oil to the steel plate 40 before trimming and then cutting it, a new finding was obtained that the following effects can be obtained. That is, the inventors confirmed that even when the supply amount of the lubricating oil to the steel plate 40 is the same, compared with the case of directly applying oil to the rotary blade 1 for trimming, when directly supplying (adhering) the lubricating oil to the steel plate 40 and cutting it, the frequency of chipping is suppressed.

[0035] The reason for this is not necessarily clear, but it is considered that a new mechanism for retaining oil at the cutting edge occurs as shown below. That is, when directly applying as in the conventional case to the rotary blade 1, after the blade contacts the steel plate 40, no new supply of lubricating oil occurs. For this reason, in the process of deforming and cutting the steel plate 40 while the corner portion of the blade, that is, the cutting edge, slides on the steel plate 40, it is impossible to suppress oil drainage at the cutting edge. Therefore, in this process, it is presumed that a lateral force caused by the friction between the steel plate 40 and the blade strongly acts on the blade.

[0036] On the other hand, when directly applied (adhered) to the steel sheet 40 before trimming, even after the blade contacts the steel sheet 40, in the process of the blade tip sliding on the steel sheet surface for cutting, the lubricating oil applied (adhered) also exists in the area of the new steel sheet surface where the blade tip has slid. Therefore, the lubricating oil will continue to be supplied. As a result, oil depletion is suppressed, and the friction between the steel sheet 40 and the blade is also reduced. Thus, it is considered that chipping of the blade is significantly suppressed when directly applying (adhering) lubricating oil to the steel sheet 40. Also, the oil locally deposited between the blade tip and the steel sheet 40 during the sliding process is generated on the side of the chips to be trimmed away, so poor degreasing due to the deposited oil is less likely to occur.

[0037] From the above, compared with the case of directly applying oil to the rotary blade 1, when directly applying (adhering) lubricating oil to the steel sheet 40, it is possible to suppress the amount of lubricating oil supplied to the steel sheet 40 for trimming.

[0038] Note that if a large amount of oil is applied to the entire steel sheet 40, a large amount of lubricating oil needs to be removed in the degreasing line, and the frequency of chemical solution replacement increases significantly. Therefore, it is very difficult to actually implement from the perspectives of cost and line operability. Also, when applied to the entire steel sheet 40, the increase in the load on the global environment is also significant. In the cutting method of the present disclosure, a remarkable effect can be obtained by applying only to the area near the rotary blade 1, so such problems can also be solved.

[0039] That is, by applying this embodiment, a large amount of oil application (adhesion) is not required to obtain a remarkable effect of suppressing chipping. As a result, there is an advantage that the effect can be obtained with an amount of oil adhesion that does not impair the degreasing property required by automobile manufacturers and the like.

[0040] Thus, according to the present disclosure, compared with the method of directly applying oil to the rotary blade 1 to cut the steel sheet 40, the frequency of chipping is suppressed with a smaller amount of adhered lubricating oil. As a result, it has been found that according to the present disclosure, it has the advantage of being applicable to uses such as for automobile frame and body parts, and is also excellent in terms of environmental conservation. Also, according to the present disclosure, it is possible to prevent scattering and also limit the area of adhesion of the lubricating oil to the steel sheet 40.

[0041] Here, the spraying amount of the lubricating oil is adjusted in terms of the oil flow rate and the like so that it can be continuously and evenly applied (adhered) to the edge portion of the surface of the steel plate 40. For example, the spraying amount is set as in the following formula (1) in order to ensure an oil application density equal to or higher than a certain level with respect to the surface of the steel plate 40.

[0042] That is, the lower limit value of the spraying amount is set, for example, by the following formula (1) according to the conveying speed of the steel plate 40. More preferably, the lower limit value of the spraying amount is set by formula (2).

[0043] Lower limit value of spraying amount = 1.00 [mL / m 2 × 0.04 (: width of spraying area) [m] × conveying speed [mpm] × 60 [min / hr] ····(1) Lower limit value of spraying amount = 7.24 [mL / m 2 × 0.04 (: width of spraying area) [m] × conveying speed [mpm] × 60 [min / hr] ····(2)

[0044] By setting the spraying amount to be equal to or greater than the amount defined by formula (1) per side, a particularly excellent effect of suppressing chipping can be obtained. Note that the lower limit value of the spraying amount defined by formula (1) corresponds to an oil application density of 1.00 mL / m 2 . The oil application density is the amount of lubricating oil adhered to the surface of the steel plate per unit area. Furthermore, by setting the spraying amount to be equal to or greater than the amount defined by formula (2), an even more excellent effect of suppressing chipping can be obtained. Therefore, it is preferable that the lower limit value of the spraying amount is within this range. Note that the lower limit value of the spraying amount defined by formula (2) corresponds to an oil application density of 7.24 mL / m 2 . It is preferable that the above oil application density is set on the steel plate surface on the upper blade side (upper surface), which is the initial occurrence location of chipping. It is more preferable that the above oil application density is set on both steel plate surfaces of the upper blade side and the lower blade side.

[0045] ​​Here, the regulations in equations (1) and (2) are based on the premise that the width of the spraying area (adhesion area) is in the range of 0.04 m from the edge of the steel plate. When the width is different, the spraying amount can be obtained by substituting that value instead of 0.04 m. [mpm] is the passing distance (m) of the steel plate 40 per minute.

[0046] When the width of the spraying area is 0.01 m and the conveying speed is 40 mpm, it is 0.02 L / hr according to equation (1) and 0.17 L / hr according to equation (2). These values can be considered as the lower limit of the spraying amount for suppressing excellent chipping, and the lower limit of the spraying amount for further suppressing chipping. The values in terms of the oiling density are as described above.

[0047] There is no specific regulation for the upper limit of the spraying amount. However, in the case of excessive oiling, there is a concern that the oil 30 adhering to the edge of the steel plate 40 will fall off the steel plate 40 and have an adverse effect on the subsequent line equipment. Therefore, it is desirable that the spraying amount be as small as possible. From this perspective, it is desirable that the spraying amount of the lubricating oil be less than 60 L / hr in total for both sides. The reason for taking the total spraying amount for both sides is that the oil flows out from both the upper and lower surfaces, and in the case of a coil, the oil on both sides integrates and flows out. A spraying amount of less than 60 L / hr in total for both sides corresponds to an oiling density of less than 15 mL / m per side when spraying on both sides. When spraying on only one side, it corresponds to an oiling density of less than 30 mL / m. Here, the width of the spraying area is 0.15 m and the conveying speed of the steel plate 40 is 230 mpm. This is a condition corresponding to the upper limit of the width of the spraying area and the conveying speed of the steel plate 40. 2 Here, the width of the spraying area is 0.15 m and the conveying speed of the steel plate 40 is 230 mpm. This is a condition corresponding to the upper limit of the width of the spraying area and the conveying speed of the steel plate 40. 2 Here, the width of the spraying area is 0.15 m and the conveying speed of the steel plate 40 is 230 mpm. This is a condition corresponding to the upper limit of the width of the spraying area and the conveying speed of the steel plate 40.

[0048] Also, from the perspective of ensuring the excellent degreasing property required for automotive steel plates, it is preferable that the oiling density be 10 mL / m or less. This is because the degreasing time is significantly affected by the oiling density. When the oiling density is 10 mL / m 2 or less. This is because the degreasing time is significantly affected by the oiling density. When the oiling density is 10 mL / m 2The following corresponds to a lubricating oil spraying amount of 20 L / hr or less in the case of single-sided spraying and 40 L / hr or less in the case of double-sided spraying. Here, the spraying amount of the lubricating oil is the spraying amount of the lubricating oil calculated with a width of the spraying area of 0.15 m and a conveying speed of the steel plate 40 of 230 mpm. From the viewpoint of ensuring more excellent degreasing properties, the oil coating density is 5 mL / m 2 It is more preferably as follows. This corresponds to a spraying amount of the lubricating oil of 10 L / hr or less in the case of single-sided spraying and 20 L / hr or less in the case of double-sided spraying. By controlling the oil coating density within this range, the time required for the degreasing process carried out by an automobile manufacturer or the like can be reduced.

[0049] In addition, in this embodiment, instead of spraying the lubricating oil as it is, it is supplied in a mist form. For this reason, the oil supply of the lubricating oil is naturally suppressed.

[0050] Here, when the application (adhesion) of the lubricating oil is carried out by dripping, the range of the dripping amount is the same as the range in the case of the above spraying. In the case of dripping, it may be calculated by replacing (the width of the spraying area) with (the width of the dripping area) in formula (1) or formula (2).

[0051] [Spraying pressure] The spraying pressure is, for example, 0.09 MPa or more and 0.12 MPa or less. The spraying pressure is not particularly limited as long as it is set so that uniform oil coating is possible in the specified spraying area.

[0052] [Spraying area] The spraying area preferably has a region of ±20 mm in the width direction of the steel plate 40 with reference to the position L which is the cutting position. When the width of the spraying area (spraying width) becomes a spraying width of 40 mm or less, a sufficient lubricating area cannot be secured at the cutting position, and there is a risk of blade chipping.

[0053] There is no particular regulation regarding the upper limit value of the width of the spraying area. However, in the case of excessive oil coating, there is a concern that the oil 30 adhering to the edge portion of the steel plate 40 may fall off from the steel plate 40 and affect the subsequent line equipment. Therefore, it is desirable that the width of the spraying area be as small as possible.

[0054] When applying the manufactured steel sheet 40 to automotive applications, excellent degreasing properties are required from the viewpoints of improving the degreasing speed, reducing degreasing defects, reducing the frequency of chemical liquid replacement, and reducing the environmental load. For this reason, it is desirable to reduce the width of the spraying area as much as possible. From such a viewpoint, it is desirable that the width of the coating area be ±100 mm (200 mm width) or less. Also, the width of the spraying area is preferably ±40 mm (80 mm width) or less by precisely controlling the lubricating oil coating density on the steel sheet 40. Further, the width of the spraying area is more preferably ±20 mm (40 mm width) or less, and even more preferably ±10 mm (20 mm width) or less.

[0055] [Distance between the injection part of the spraying device and the steel sheet 40] The distance between the injection part of the spraying device and the steel sheet 40 is preferably set at 40 mm or more. If it is less than 40 mm, when the steel sheet 40 with a bad shape passes, the nozzle part of the spraying device may interfere with the steel sheet 40.

[0056] There is no particular regulation regarding the upper limit value of the distance between the injection part of the spraying device and the steel sheet 40. The farther the distance, the lower the density of the lubricating oil (oil coating density) adhering to the surface of the steel sheet 40 and the wider the width of the spraying area. However, as long as the oil coating density and the spraying area can be ensured within the preset target range, there is no regulation on the upper limit value of the distance.

[0057] In this embodiment, the injection nozzles are arranged to face the upper and lower surfaces of the steel sheet 40, and are configured to adhere lubricating oil to the positions where the front and back surfaces of the steel sheet 40 are cut by the rotary blade 1.

[0058] [Viscosity of the lubricating oil] The viscosity of the lubricating oil is preferably 3 mm 2 / s or more and 130 mm 2 / s or less when the liquid temperature of the lubricating oil is 40°C. 3 mm 2When it is less than / s, the cutting surface of the rotary blade 1 and the steel plate 40 act with a high surface pressure. Therefore, there is a risk that the rotary blade 1 and the steel plate 40 will come into direct contact due to oil starvation. In the cutting of high-tensile steel plates with a strength of 1180 MPa or more, from the viewpoint of suppressing oil starvation even at a higher surface pressure, when the liquid temperature of the lubricating oil is 40 °C, the viscosity of the lubricating oil is 8 mm 2 / s or more is more preferable.

[0059] Also, when the viscosity of the lubricating oil is greater than 130 mm 2 / s, after the lubricating oil adheres to the steel plate surface, the diffusion and penetration on the steel plate surface are insufficient, and there is a risk of local lack of lubricating oil. Also, in the process of the rotary blade 1 cutting the steel plate 40, the supply of the lubricating oil to the side surface of the rotary blade 1 is insufficient, and there is a risk that the side surface of the rotary blade 1 and the steel plate 40 will come into direct contact. Therefore, the viscosity of the lubricating oil is preferably 130 mm 2 / s or less. Further, from the viewpoint of making the adhered oil more uniformly distributed, the viscosity of the lubricating oil is preferably 100 mm 2 / s or less when the liquid temperature of the lubricating oil is 40 °C. The measurement of viscosity is based on JIS Z8803. The viscosity can be measured, for example, with a rotational viscometer.

[0060] The type of lubricating oil is not particularly specified. For example, as the lubricating oil, press oil, rust preventive oil, cutting oil, etc. can be exemplified. Even when cutting high-tensile steel plates, from the viewpoint of stably suppressing chipping, extreme pressure additives can also be added to these lubricating oils.

[0061] The average diameter of the mist after spraying is, for example, in the range of 1 μm or more and 2000 μm or less. There is no particular restriction on the lower limit of the average diameter of the mist. However, if the particle size is too small, it will scatter to the surroundings and the adhesion rate to the steel plate 40 will decrease. Also, there are concerns such as the scattered oil splashing around and posing a risk from the viewpoint of disaster prevention. There is no particular restriction on the upper limit of the average diameter of the mist either. However, there is a concern that the adhesion amount will become non-uniform and chipping will easily occur. From the viewpoint of suppressing chipping, a more preferable range of the average diameter of the mist is 100 μm or less.

[0062] [Retention time from the adhesion of lubricating oil to the steel plate 40 until cutting starts] The retention time from the adhesion of lubricating oil to the steel plate 40 until cutting starts is not particularly specified. However, from the viewpoint of dispersing the oil particles adhering to the steel plate surface to achieve a uniform adhesion state, the retention time is preferably 1 second or more. When the diameter of the adhered lubricating oil particles is large, the time for the oil particles adhering to the steel plate surface to disperse on the steel plate surface and achieve a uniform adhesion state becomes longer. Therefore, when the particle size of the lubricating oil exceeds 2000 μm, the retention time is desirably 3 seconds or more.

[0063] [Modification example] In the above description, the case where the lubricating oil application device 6 is configured as a spraying device is exemplified. The lubricating oil application device 6 may have other configurations as long as it can apply lubricating oil to the steel plate surface. For example, the lubricating oil application device 6 may be configured as an oil dropping device or the like.

[0064] [Plate presser] The plate presser of this embodiment includes a center presser roll 5, a full-width presser roll 4, and an edge presser roll 2. One or both of the center presser roll 5 and the full-width presser roll 4 may not be provided.

[0065] [Center presser roll 5] As shown in FIG. 2, the center presser roll 5 is disposed at the center in the plate width direction in the region between the left and right rotary blades 1. The center presser roll 5 has an upper center presser roll and a lower center presser roll that are paired up and down. Then, the upper center presser roll and the lower center presser roll grip (pinch) the center in the plate width direction from above and below, thereby suppressing the flutter of the steel plate 40 in the trimmer section from the plate width direction.

[0066] [Full-width presser roll 4] As shown in FIGS. 1 and 2, the full-width pressing roll 4 is arranged upstream of the position of the rotary blade 1 in the cutting direction. In the present embodiment, the full-width pressing roll 4 is arranged upstream of the lubricating oil applying device 6 in the cutting direction and close to the lubricating oil applying device 6 in a plan view. In the steel plate traveling direction, the distance between the lubricating oil applying device 6 and the full-width pressing roll 4 is, for example, 50 mm or more and 500 mm or less.

[0067] The full-width pressing roll 4 has an upper full-width pressing roll and a lower full-width pressing roll that are paired up and down. The upper full-width pressing roll and the lower full-width pressing roll are, for example, longer than the plate width of the target steel plate 40. Then, by gripping (pinching) the entire area in the plate width direction from above and below with the upper full-width pressing roll and the lower full-width pressing roll, the behavior of the steel plate 40 toward the rotary blade 1 is stabilized, and the vibration of the steel plate 40 at the position where the lubricating oil is applied by the lubricating oil applying device 6 is suppressed.

[0068] The full-width pressing roll 4 may be arranged on the downstream side (rotary blade side) in the cutting direction of the lubricating oil applying device 6 in a plan view.

[0069] [Edge pressing roll 2] The edge pressing roll 2 constitutes an edge gripper. As shown in FIGS. 1 and 2, the edge pressing roll 2 is arranged upstream of the position of the rotary blade 1 in the cutting direction. In the present embodiment, the edge pressing roll 2 is arranged downstream of the lubricating oil applying device 6 in the cutting direction and close to the lubricating oil applying device 6 in a plan view.

[0070] In the steel plate traveling direction (cutting direction), in a plan view, the distance between the central axis of the rotary blade 1 and the edge pressing roll 2 is, for example, 500 mm or less. It is preferable to arrange the edge pressing roll 2 as close as possible to the rotary blade 1, but it is arranged at a position where it does not interfere with the rotary blade 1 to grip the position to be cut by the rotary blade 1.

[0071] The edge pressing roll 2 has an upper edge pressing roll 2A and a lower edge pressing roll 2B that are paired up and down. Then, the upper edge pressing roll 2A and the lower edge pressing roll 2B grip (pinch) the end portion in the plate width direction from above and below, thereby suppressing the flutter of the steel plate 40 in the trimmer section from the steel plate advancing direction.

[0072] Here, as shown in FIG. 2, the edge pressing roll 2 is disposed between the rotary blade 1 and the lubricating oil adhesion position, and presses the lubricating oil adhered to the steel plate surface against the steel plate surface side with a rotating roll, thereby also having the function of equalizing the film thickness of the lubricating oil adhered to the steel plate surface. That is, when the lubricating oil adhered by dropping or spraying is unevenly distributed, the edge pressing roll 2 also has the function of uniformly adjusting the adhesion amount in the lubricating oil adhesion region, particularly in the vicinity of the cutting portion (width of 10 to 100 mm).

[0073] Note that the edge pressing roll 2 may be disposed at a position upstream in the cutting direction from the lubricating oil adhesion device 6 in plan view. However, from the viewpoint of disposing the edge pressing roll 2 closer to the rotary blade 1, it is preferable that the edge pressing roll 2 be disposed on the downstream side (rotary blade side) in the cutting direction from the lubricating oil adhesion device 6 in plan view.

[0074] [Width direction position adjustment mechanism] Here, the edge pressing roll 2 of the present embodiment has the following configuration in the paired upper edge pressing roll 2A and lower edge pressing roll 2B. That is, as shown in FIG. 3, the length of the lower edge pressing roll 2B is set to be long, for example, 2000 mm in length, and has a length that can fully correspond to the length of the target steel plate 40 after cutting. On the other hand, the upper edge pressing roll 2A is configured to be displaceable in the plate width direction within a range where it can face the lower edge pressing roll 2B up and down by a width direction position adjustment mechanism. The mechanism for displacing it is the width direction position adjustment mechanism.

[0075] The width direction position adjustment mechanism includes, as shown in FIG. 3, a roll support 11, a slide shaft 8, a ball screw 7, a width variable motor 9, and an absolute position detector 10 such as an encoder.

[0076] The roll support 11 rotatably supports the upper edge pressing roll 2A. Note that the shape of the roll support 11 illustrated in FIG. 3 is schematically exemplified.

[0077] The slide shaft 8 is a shaft member extending in the plate width direction, and is a member that supports the roll support 11 and guides the roll support 11 so as to be displaceable in the plate width direction.

[0078] The ball screw 7 is arranged with its axis oriented in the plate width direction parallel to the slide shaft 8, and engages with a nut portion 11A formed with a female screw of the roll support 11 to constitute a linear motion guide mechanism together with the nut portion 11A. Then, according to the rotation and rotation direction of the ball screw 7, the roll support 11 is displaced in the plate width direction along the slide shaft 8. Note that the nut portions 11A of the left and right roll supports 11 have female screws with opposite directions.

[0079] In the present embodiment, as shown in FIG. 3, it includes a roll support 11 supported by the upper edge pressing roll 2A arranged on the right side of the plate, and a roll support 11 supported by the upper edge pressing roll 2A arranged on the left side of the plate. The left roll support 11 and the right roll support 11 are both guidable on a common slide shaft 8 and are configured to be displaceable in opposite directions by the axial rotation of a common ball screw 7. Also, the distance from the center portion in the plate width direction of the upper edge pressing roll 2A on the right side of the plate and the upper edge pressing roll 2A on the left side of the plate is set to be equal. Note that the rolling surface of the upper edge pressing roll 2A is more easily displaceable in the plate width direction by the adhesion of lubricating oil.

[0080] The width variable motor 9 is composed of a servo motor or the like and axially rotates the ball screw 7. Further, the absolute position detector 10 detects the amount of axial rotation of the ball screw 7. The absolute position detector 10 detects, for example, the amount of displacement from the initial position in the plate width direction of the upper edge pressing roll 2A.

[0081] The variable width (displaceable amount) of the upper edge pressing roll 2A in the plate width direction may be set, for example, in the range of 700 mm to 1850 mm. Thereby, it is possible to press, that is, grip, the edge portion of the steel plate 40 within this range. The edge pressing roll 2 can press the trim portion up and down at the front part immediately before the trimmer blade for steel plates 40 of any width.

[0082] Also, in the present embodiment, the lubricating oil adhering device 6 is also supported by the roll support 11. In a plan view, the position of the lubricating oil adhering device 6 in the plate width direction is set so as to overlap the position of the upper edge pressing roll 2A in the plate width direction.

[0083] Then, the width direction position adjusting mechanism adjusts the position of the upper edge pressing roll 2A in the plate width direction (the gripping position of the edge pressing roll 2). Then, in synchronization, the lubricating oil adhering position by the lubricating oil adhering device 6 is also adjusted to the upstream position in the cutting direction of the cutting position by the rotary blade 1 as shown in FIG. 2.

[0084] Note that it may be configured such that the position of the lubricating oil adhering device 6 in the plate width direction is adjusted by another width direction position adjusting mechanism. Also, individual width direction position adjusting mechanisms may be provided for each of the left and right upper edge pressing rolls 2A.

[0085] <Roll position control unit 21> The roll position control unit 21 is a control unit that adjusts the position of the upper edge pressing roll 2A in the plate width direction. Note that reference numeral 20 is an end position detector 20 that detects the position of the end portion in the width direction of the steel plate 40 before cutting.

[0086] The roll position control unit 21 determines the cutting position of the rotary blade 1 in the plate width direction based on the end position of the plate detected by the end position detector 20 and the trimming width by the rotary blade 1. When cutting the same steel plate 40, once the current cutting position is specified, the signal from the end position detector 20 is unnecessary, and the cutting position of the rotary blade 1 in the plate width direction can be determined only from the trimming width by the rotary blade 1.

[0087] Then, the roll position control unit 21 drives the width variable motor 9 while specifying the position of the upper edge pressing roll 2A in the plate width direction by the signal from the absolute position detector 10, and displaces the position of the upper edge pressing roll 2A in the plate width direction to the cutting position of the rotary blade 1 in the plate width direction.

[0088] For example, it is set so that the central portion in the longitudinal direction of the upper edge pressing roll 2A becomes the cutting position of the rotary blade 1 in the plate width direction.

[0089] (Operation) Here, in FIGS. 1 and 2, the steel plate 40 is conveyed from the right side to the left side of the paper surface, so that the end (edge portion) of the steel plate 40 is continuously cut from the left side to the right side of the paper surface. Therefore, in FIGS. 1 and 2, the right side of the paper surface is the upstream side in the cutting direction.

[0090] In this embodiment, the edge pressing roll 2 arranged in front of the cutting position by the rotary blade 1 (trimmer blade) presses the vicinity of the cutting portion to suppress the fluttering of the plate during cutting. In this embodiment, further, by pressing the central position in the plate width direction of the cutting position with the center pressing roll 5, the fluttering of the plate during cutting can be further suppressed.

[0091] In addition, in the present embodiment, the position of gripping the plate by the edge pressing roll 2 (the position of the upper edge pressing roll 2A in the plate width direction) is adjustable. As a result, even if the trim width (cutting amount) by the rotary blade 1 changes, the edge pressing roll 2 can surely grip the cutting position by the rotary blade 1 (trimmer blade) in the plate width direction, and it becomes possible to more surely suppress the fluttering of the plate during cutting. As a result, chipping of the rotary blade 1 is suppressed.

[0092] Here, in the present embodiment, since the front side of the cutting position is pressed by the edge pressing roll 2, regardless of the plate width, the distance between the cutting position and the position for suppressing fluttering can be set to be the same, and it becomes possible to stably suppress the fluttering of the plate.

[0093] Furthermore, in the present embodiment, lubricating oil is adhered (oil applied) to the upstream position in the cutting direction from the cutting position, thereby applying the lubricating oil 30 for cutting to the cutting position. As a result, the friction between the rotary blade 1 constituting the trimmer blade and the steel plate 40 can be reduced. And by suppressing the fluttering of the plate and reducing the friction between the rotary blade 1 and the steel plate 40, it becomes possible to more suppress the chipping of the rotary blade 1. That is, by directly applying (adhering) the lubricating oil 30 to the steel plate 40 before trimming, the shortage of oil supply at the cutting position is eliminated. As a result, in the present embodiment, by reducing the friction, the frequency of chipping of the trimmer is suppressed, and even if it is necessary to rotate the rotary blade 1 at a high speed to perform cutting, the yield of steel plate manufacturing is improved.

[0094] At this time, in the present embodiment, the lubricating oil adhering device 6 is supported by the roll support 11. As a result, in the plate width direction, when the position of gripping by the edge pressing roll 2 is changed, there is an effect that the width direction position of the lubricating oil adhering device 6 is automatically adjusted.

[0095] Also, in the present embodiment, in the cutting direction, the lubricating oil application device 6 is arranged upstream of the upper edge pressing roll 2A. Therefore, the rolling upper edge pressing roll 2A presses and stretches the lubricating oil 30 adhering to the steel sheet 40 against the surface of the steel sheet 40. As a result, the edge pressing roll 2 also serves to equalize the adhered lubricating oil 30 and increase the adhesion density of the lubricating oil 30 to the steel sheet 40. That is, by pressing the oil with the upper edge pressing roll 2A, it becomes possible to supply the oil to the cutting position more stably.

[0096] Note that the chipping of the rotary blade 1 depends on the steel sheet strength, setting conditions, etc., and is not strictly specified, but occurs within a cutting length of several hundred m to several tens of thousands of m. Therefore, from the viewpoint of improving productivity, it is also possible to create a region where oil application is not performed partially within a range of several hundred m in the longitudinal direction of the steel sheet 40. Even if there is a region where oil application is not performed partially, since there is a region that satisfies the requirements of the present disclosure, the effect of suppressing chipping, the effect of suppressing pressing flaws thereby, and further the effect of suppressing conveyance troubles, coil winding shape defects, and press dimensional accuracy defects can be obtained.

[0097] Here, when the lubricating oil is directly applied to the rotary blade 1, as described above, oil starvation is likely to occur at the blade tip, and as a result, a large frictional force is generated on the shear cross-section, causing a large plastic deformation. For this reason, the cut surface has a fracture surface shape with a high shear cross-section ratio. The cut surface with such a large plastic deformation has poor residual ductility. Therefore, exfoliation of iron powder from the end face is likely to occur in the processes after the cutting process, and the exfoliated iron powder causes pressing flaws and increases the occurrence rate of surface defects. Its effect is particularly prominent in high-tensile steel sheets of 980 MPa grade or higher, and even more prominent in high-tensile steel sheets of 1180 MPa grade or higher. On the other hand, based on the present disclosure, when cutting by directly applying the lubricating oil 30 to the steel sheet 40, the frictional force at the first cut surface is reduced in high-tensile steel sheets with a wide range of strengths of 590 MPa grade or higher.

[0098] In addition, metal strips such as rolled steel sheets, coil materials, and blank materials formed by the cutting method of the present disclosure have smooth end faces at the cut surfaces at the widthwise ends. Therefore, since the removal of iron powder after cutting is suppressed more than in the conventional case, it is possible to suppress the occurrence of pressing defects due to the removal of iron powder. That is, it becomes possible to provide rolled steel sheets, coil materials, and blank materials of good quality.

[0099] (Other) The present disclosure may also have the following configurations. (1) A side trimmer device that continuously cuts the widthwise ends of a metal strip with a trimmer blade, an edge gripper that grips the strip end by sandwiching the widthwise end of the metal strip with a pair of pressing rolls in the plate thickness direction at a position upstream of the trimmer blade in the cutting direction; a widthwise position adjustment mechanism that adjusts the gripping position by the edge gripper by displacing the plate width position of at least one of the pressing rolls constituting the edge gripper; A side trimmer device comprising the above. (2) It includes a control unit that adjusts the gripping position via the widthwise position adjustment mechanism according to the trim width by the trimmer blade. (3) It includes an absolute position detector that obtains the gripping position, and the control unit specifies the gripping position based on information from the absolute position detector. (4) It includes a lubricating oil adhesion device that adheres lubricating oil to the position on the metal strip surface where cutting is to be performed by the trimmer blade before cutting with the trimmer blade. (5) The gripping position is arranged downstream in the cutting direction with respect to the lubricating oil adhesion device. (6) It includes a synchronization mechanism that displaces the lubricating oil adhesion device in the plate width direction by the same distance in the same direction as the displacement of the pressing roll in synchronization with the displacement of the pressing roll by the widthwise position adjustment mechanism. (7) The edge gripper has a pair of pressing rolls, and among the pair of pressing rolls, one pressing roll is shorter than the other pressing roll. The above-mentioned width direction position adjustment mechanism is configured to adjust the gripping position by displacing the above-mentioned one pressing roll in the plate width direction. The above-mentioned width direction position adjustment mechanism includes a roll support for rotatably supporting the above-mentioned one pressing roll, a slide shaft for guiding the above-mentioned roll support in the plate width direction, and a ball screw for displacing the above-mentioned roll support in the plate width direction by axial rotation. It is provided with. (8) A lubricating oil adhesion device for adhering lubricating oil to the position on the surface of the metal strip before cutting with the above-mentioned trimmer blade, at the position where the above-mentioned trimmer blade cuts. The above-mentioned lubricating oil adhesion device is supported by the above-mentioned roll support. The side trimmer device described in the present disclosure. (9) A method for side trimming a metal strip in which the width direction end of the metal strip is continuously cut with a trimmer blade, at a position upstream in the cutting direction of the above-mentioned trimmer blade, gripping the width direction end of the above-mentioned metal strip by sandwiching it with a pair of pressing rolls, changing the width position of the metal strip in the gripping according to the trimmer width at the above-mentioned trimmer blade, A method for side trimming a metal strip. (10) Adhere lubricating oil to the position on the surface of the metal strip before cutting with the above-mentioned trimmer blade, at the position where the above-mentioned trimmer blade cuts. (11) Change the position in the width direction of the metal strip to which the above-mentioned lubricating oil is adhered in the same direction and by the same distance as the change of the gripping, in synchronization with the change of the gripping position. (12) A method for manufacturing a metal strip having the side trimming method of the present disclosure.

Embodiment

[0100] Next, an example based on the present embodiment will be described. (Configuration)

[0101] As a side trimmer device, the device configuration described in the embodiment as shown in FIGS. 1 and 2 was adopted. That is, an edge press roll 2 was provided immediately in front of the rotary blade 1 which is a trimming blade. Also, a full-width press roll 4 was provided. Further, center press rolls 5 were provided at the center portions in the plate width direction of the left and right rotary blades 1. Thus, a configuration was achieved that can suppress the flutter of the steel plate 40 in the trimmer section.

[0102] Furthermore, a configuration was achieved such that the friction between the rotary blade 1 and the steel plate 40 can be reduced by directly applying oil to the edge portion of the steel plate by means of the lubricating oil application device 6 attached to the roll support 11 of the upper edge press roll 2A. Here, as shown in FIG. 3, the roll support 11 of the upper edge press roll 2A has a structure that is variable in the plate width direction by means of a ball screw 7 and a slide shaft 8. The variation is made by driving a width variation motor 9, and the position of the upper edge press roll 2A (the position of gripping by the edge press roll 2) was specified by an absolute position detector 10. Then, according to the trim width, the position of the upper edge press roll 2A was adjusted in the plate width direction to the cutting position.

[0103] (Evaluation) With the side trimmer device having the above configuration, the operation of steel plate manufacturing was carried out using a high-tensile steel plate (high-tensile) of 590 MPa or more as the steel plate 40 to be cut. At this time, the number of operation stops due to chipping of the blade was confirmed between the case without plate pressing by the above-described edge press roll 2, full-width press roll 4, and center press roll 5 (without supply of lubricating oil) and the case with the above-described plate pressing (without supply of lubricating oil). As a result, it was confirmed that the number of operation stops due to chipping was reduced to 1 / 10 or less in the case with plate pressing compared to the case without plate pressing (without adhesion of lubricating oil).

[0104] Furthermore, when it was confirmed for the case where lubricating oil was also applied in a state with plate pressing, the following results were obtained. That is, the number of operation stops which was 4 times per month when there was no adhesion of lubricating oil became zero times per month when lubricating oil was also applied.

[0105] In addition, the load factor of the drive motor that drives the rotary blade 1 during its operation was evaluated. The steel plate 40 to be cut was a steel plate with a thickness of 1.0 mm made of a 980 MPa high-tensile material. As a result, it was confirmed that when both the plate presser and the lubricating oil were used, the motor load factor could be reduced by 15.8% compared to the case where neither the plate presser nor the lubricating oil was present.

[0106] In this way, due to the effects of the plate presser and the application of the lubricating oil based on the present disclosure, a reduction in the motor load factor of the rotary blade 1 was confirmed. That is, it was found that by being based on the present disclosure, it is possible to reduce the friction between the trimmer blade and the steel plate 40 and reduce the number of blade chippings.

Explanation of Reference Numerals

[0107] 1 Rotary blade (trimmer blade) 2 Edge presser roll 4 Full-width presser roll 5 Center presser roll 6 Lubricating oil application device 7 Ball screw 8 Slide shaft 9 Width variable motor 10 Absolute position detector 11 Roll support (synchronization mechanism) 11A Nut portion 20 End position detector 21 Roll position control unit 30 Lubricating oil 40 Steel plate

Claims

1. A side trimmer device for continuously cutting the widthwise ends of a metal strip with a trimmer blade, an edge gripper that grips the strip edge by sandwiching the widthwise end of the metal strip with a pair of pressing rolls that face each other in the thickness direction at a position upstream of the trimmer blade in the cutting direction; a widthwise position adjustment mechanism that adjusts the gripping position by the edge gripper by displacing the plate width position of at least one of the pressing rolls constituting the edge gripper; comprising; the edge gripper has a pair of pressing rolls that face each other, and of the pair of pressing rolls, one pressing roll is shorter than the other pressing roll; the widthwise position adjustment mechanism is configured to adjust the gripping position by displacing the one pressing roll in the plate width direction; the widthwise position adjustment mechanism; a roll support that rotatably supports the one pressing roll; a slide shaft that guides the roll support in the plate width direction; a ball screw that displaces the roll support in the plate width direction by axial rotation; comprising; a lubricating oil application device that applies lubricating oil to the position on the surface of the metal strip before cutting with the trimmer blade where cutting is performed with the trimmer blade; the lubricating oil application device is supported by the roll support; Side trimmer device.

2. comprising a control unit that adjusts the gripping position via the widthwise position adjustment mechanism according to the trim width by the trimmer blade; The side trimmer device according to claim 1.

3. comprising an absolute position detector that determines the gripping position; the control unit identifies the gripping position based on information from the absolute position detector; The side trimmer device according to claim 2.

4. comprising a lubricating oil application device that applies lubricating oil to the position on the surface of the metal strip before cutting with the trimmer blade where cutting is performed with the trimmer blade; The side trimmer device according to claim 1.

5. the gripping position is arranged downstream in the cutting direction with respect to the lubricating oil application device; The side trimmer device according to claim 4.

6. comprising a synchronization mechanism that displaces the lubricating oil application device in the plate width direction by the same distance in the same direction as the displacement of the pressing roll in synchronization with the displacement of the pressing roll by the widthwise position adjustment mechanism; The side trimmer device according to claim 4, characterized in that.

7. A method for side trimming a metal strip, which continuously cuts the widthwise ends of the metal strip with a trimmer blade, using the side trimmer device according to any one of claims 1 to 6, at a position upstream in the cutting direction of the trimmer blade, gripping the widthwise ends of the metal strip by sandwiching them with a pair of pressing rolls, changing the width position of the gripped metal strip according to the trimmer width at the trimmer blade, A method for side trimming a metal strip.

8. Applying lubricating oil to the position on the surface of the metal strip before cutting with the trimmer blade, at which position the metal strip is to be cut with the trimmer blade, The method for side trimming a metal strip according to claim 7.

9. Changing the position in the width direction of the metal strip to which the lubricating oil is applied in the same direction and by the same distance as the change in the gripping, in synchronization with the change in the gripping position, The method for side trimming a metal strip according to claim 8.

10. A method for manufacturing a metal strip, having the side trimming method according to claim 7.

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