Cutting equipment, cutting methods, and multilayer materials

Abstract

The invention relates to a cutting device, a cutting method, and a multilayer material. More specifically, the invention relates to a cutting device for cutting workpieces clamped in the first direction, wherein the first tool (110) and the second tool (120) are arranged in the first direction so that they are opposite each other, each cutting edge (110a) of the first tool and the cutting edge (120a) of the second tool have a clamping surface (S1) perpendicular to the first direction and the first vertical wall surface (S2) perpendicular to the clamping surface (S1), at least one of the cutting edge (110a) of the first tool and the cutting edge (120a) of the second tool has an inclined tool surface (S3) between the clamping surface (S1) and the first vertical wall surface (S2), the angle between the clamping surface (S1) and the inclined tool surface (S3) is obtuse, and the clearance C [mm] between the first tool (110) and the second tool (120) and the distance d [mm] between the pressed surfaces (S1) satisfies the formula (A) below: n < C / d < m ...(A) where n = 0.3 + (-0.15) x (1-cos4θ), m = 0.4, where θ [°] is the angle of inclination of the inclined surface of the instrument (S3) with respect to the first direction.

Description

Cutting device, cutting method and composite material

[0001] The present invention relates to a cutting device for cutting a workpiece, a cutting method, and a multi-layer material having a cut end surface.

[0002] Multilayer materials, such as plated steel sheets in which the surface of a steel sheet is plated or painted steel sheets in which the surface of a steel sheet is painted, are manufactured and used depending on the application. The reason for coating a base material with a coating material is to improve the corrosion resistance of the base material (steel sheet) compared to its raw state, for example, in the case of plated steel sheets used in building materials, automobiles, and home appliances. However, the manufacturing process for parts and the like made from multilayer materials includes a process of cutting necessary components from the base sheet, such as shearing or laser cutting. The cut edge formed by this cutting process includes a shear surface or a fracture surface that almost completely exposes the base material. The effect of the coating material is not exerted in the exposed portion of the cut edge. For example, when the multilayer material is a plated steel sheet, the corrosion resistance improvement effect of the plating cannot be obtained in the exposed portion of the base material at the cut edge, and there is a concern of red rust formation.

[0003] For this reason, even for parts made of multi-layer materials, in order to ensure that the effects of the coating material are exerted on the cut edge as well as on the front and back surfaces covered by the coating material, the cut edge generally requires post-processing (for example, applying a paint containing the main component of the plating in the case of plating). This requires time and cost. Therefore, technologies are being investigated that allow the coating material to wrap around the cut edge as much as possible when cutting multi-layer materials, thereby ensuring that the effects of the coating material are exerted on the cut edge as well as on the front and back surfaces.

[0004] For example, Patent Document 1 discloses a cutting device for cutting a multi-layer material sandwiched between a first tool and a second tool. In this cutting device, the first tool and the second tool are arranged with their respective blade portions facing each other in the pushing direction, and the blade portion of at least one of the first tool or the second tool has an inclined portion having a tool inclined surface inclined with respect to the pushing direction, a vertical wall surface extending from the tool inclined surface along the pushing direction, and a pressing surface perpendicular to the vertical wall surface, and a protrusion protruding from the inclined portion in the pushing direction, and the inclined portion overlaps with the opposing tool when viewed in the pushing direction.

[0005] International Publication No. 2023 / 058341

[0006] However, in the case of a composite material cut by the cutting device described in Patent Document 1, the fracture surface of the cut end surface appears along the plate thickness direction (FIGS. 10A and 10B of Patent Document 1). Therefore, when the cut end surface of the composite material is viewed from a direction perpendicular to the plate thickness direction, the fracture surface can be seen. The fracture surface is an exposed portion of the base metal that is not covered with a coating material, and is more susceptible to rust than other portions. In other words, if the fracture surface of the cut end surface appears along the plate thickness direction, it may be aesthetically undesirable.

[0007] Therefore, the present invention has been made in consideration of the above problems, and an object of the present invention is to provide a cutting device, a cutting method, and a multi-layer material that can achieve the same effect obtained by the coating material on the cut end surface as on the front and back surfaces, and can position the fracture surface of the cut end surface in a location that is difficult to see visually.

[0008] In order to solve the above-mentioned problems, according to one aspect of the present invention, there is provided a cutting device that cuts a workpiece sandwiched in a first direction between a first tool and a second tool, wherein the first tool and the second tool have their respective blade portions arranged facing each other in the first direction, the blade portion of the first tool and the blade portion of the second tool have a pressing surface perpendicular to the first direction and a first vertical wall surface perpendicular to the pressing surface, at least one of the blade portion of the first tool or the blade portion of the second tool has a tool inclined surface inclined with respect to the first direction between the pressing surface and the first vertical wall surface, and the angle formed by the pressing surface and the tool inclined surface is an obtuse angle, and the clearance C [mm] between the first tool and the second tool and the distance d [mm] between the pressing surfaces when the pressing surfaces of the first tool and the second tool abut against the workpiece to be cut satisfy the following formula (A). n<C / d<m (A) where n=0.3+(-0.15)×(1-cos 4θ) and m=0.4, and θ [°] is the inclination angle of the tool inclined surface with respect to the first direction.

[0009] The inclination angle θ may be greater than or equal to 15° and less than or equal to 45°.

[0010] The first tool and the second tool may each include a tool ramp.

[0011] The shape of the first tool and the shape of the second tool may be symmetrical.

[0012] At least one of the cutting edge of the first tool and the cutting edge of the second tool may have a second vertical wall surface between the pressing surface and the tool inclined surface that is perpendicular to the pressing surface, and may satisfy the above formula (A) where n = 0.3 + (0.0625x - 0.15) × (1 - cos 4θ) and m = 0.4, where x [mm] is the length of the second vertical wall surface in the first direction.

[0013] The length x of the second vertical wall surface may be 0.1 mm or more and 0.8 mm or less.

[0014] Further, in order to solve the above-mentioned problems, according to another aspect of the present invention, there is provided a cutting method for cutting a workpiece sandwiched in a first direction between a first tool and a second tool, wherein the blade portion of the first tool and the blade portion of the second tool have a pressing surface perpendicular to the first direction and a first vertical wall surface perpendicular to the pressing surface, at least one of the blade portion of the first tool or the blade portion of the second tool has a tool inclined surface inclined with respect to the first direction between the pressing surface and the first vertical wall surface, and the angle formed by the pressing surface and the tool inclined surface is an obtuse angle, and the cutting method clamps and cuts the workpiece between the first tool and the second tool so that a clearance C [mm] between the first tool and the second tool and a distance d [mm] between the pressing surfaces when the pressing surfaces of the first tool and the second tool abut against the workpiece to be cut satisfy the following formula (A): n<C / d<m (A) where n=0.3+(-0.15)×(1-cos 4θ) and m=0.4, and θ [°] is the inclination angle of the tool inclined surface with respect to the first direction.

[0015] At least one of the blades of the first tool and the second tool may have a second vertical wall surface between the pressing surface and the tool inclined surface, the second vertical wall surface being perpendicular to the pressing surface, and the workpiece may be sandwiched and cut between the first tool and the second tool so that the clearance C [mm] between the first tool and the second tool and the distance d [mm] between the pressing surfaces of the first tool and the second tool when they contact the workpiece to be cut satisfy the above formula (A) where n = 0.3 + (0.0625x - 0.15) × (1 - cos 4θ) and m = 0.4, where x [mm] is the length of the second vertical wall surface in the first direction.

[0016] Furthermore, in order to solve the above-mentioned problems, according to another aspect of the present invention, there is provided a multi-layer material in which the surface of a base material is coated with a coating material, and which has a cut end surface along the plate thickness direction from the first surface to the second surface, and the cut end surface has, in order, an inclined surface inclined from the first surface in the plate thickness direction, a vertical wall surface along the plate thickness direction that continues from the inclined surface, and a fracture surface connecting the vertical wall surface and the second surface, or has, in order, an inclined surface inclined from the first surface in the plate thickness direction and a fracture surface connecting the inclined surface and the second surface, and at least a portion of the inclined surface is coated with a coating material that continues from the first surface, and at least a portion of the fracture surface is along the second surface.

[0017] The length of the fracture surface in the plate width direction may be 30% or less of the plate thickness of the multilayer material.

[0018] The first surface may intersect with the inclined surface, and an internal angle between the first surface and the inclined surface may be an obtuse angle.

[0019] The fracture surface may be composed of a first fracture surface and a second fracture surface, and the first fracture surface and the second fracture surface may intersect.

[0020] The first fracture surface and the second fracture surface may intersect at an angle of less than 90°.

[0021] The coating material may be made of Zn, Al or an alloy thereof.

[0022] The base material may be a steel plate.

[0023] As described above, according to the present invention, the effect obtained by the coating material on the cut end surface can be exerted to the same extent as on the front and back surfaces, and the fracture surface of the cut end surface can be positioned in a part that is difficult to see visually.

[0024] 1 is a schematic diagram showing an example of the configuration of slitting equipment including a slitting device, which is an example of a cutting device according to an embodiment of the present invention, with a plan view on the upper side and a side view on the lower side.

[0023] FIG. 1 is a schematic diagram showing an example of the configuration of a slitting device according to the present embodiment.

[0024] FIG. 2 is a cross-sectional view taken along the line II of the slitting device shown in FIG. 2.

[0025] FIG. 3 is a partial enlarged view of an upper rotating unit and a lower rotating unit of the slitting device according to the embodiment, showing a case where a pair of slitting blades have different shapes.

[0026] FIG. 4 is a partial enlarged view of an upper rotating unit and a lower rotating unit of the slitting device according to the embodiment, showing a case where a pair of slitting blades have vertically symmetrical shapes.

[0027] FIG. 5 is a schematic diagram showing a cutting state when both the first slitting blade and the second slitting blade are right-angled blades.

[0028] FIG. 6 is a schematic diagram showing a cut end surface of a plated steel sheet after cutting with the pair of slitting blades shown in FIG. 6.

[0029] FIG. 7 is a schematic diagram showing a cutting state when the first slitting blade has blade portion configuration A and the second slitting blade has blade portion configuration A.

[0029] FIG. 8 is a schematic diagram showing an example of a cut end surface of a plated steel sheet after cutting with the pair of slitting blades shown in FIG. 8 or FIG. 12 or 13 。 FIG. 13 is a schematic diagram showing another example of the cut end surface of the plated steel sheet after cutting with the pair of slit blades shown in FIG. 8 or 9 . FIG. 14 is a schematic diagram showing a cutting state when the first slit blade has a blade portion of blade portion form B and the second slit blade is a right-angled blade. FIG. 15 is a schematic diagram showing a cutting state when the first slit blade and the second slit blade have blade portions of blade portion form B. FIG. 16 is a schematic diagram showing an example of the cut end surface of the plated steel sheet after cutting with the pair of slit blades shown in FIG. 12 or 13 . FIG. 17 is a schematic diagram showing another example of the cut end surface of the plated steel sheet after cutting with the pair of slit blades shown in FIG. 12 or 13 . FIG. 18 is a diagram showing simulation results of Example 5, Example 13, Comparative Example 3, and Comparative Example 6 as examples. FIG. 19 is a schematic diagram showing an example of the blade portion of a punch (tool) of a push die. FIG. 19 is a schematic diagram showing an example of the blade portion of a shear (tool) of a shear cutting machine.

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant explanations will be omitted.

[0026] [1. Cutting Device] First, the schematic configuration of a cutting device according to one embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a schematic diagram showing an example of the configuration of a slitting facility including a slitting device 100, which is an example of a cutting device according to this embodiment. The upper side shows a plan view, and the lower side shows a side view. FIG. 2 is a schematic diagram showing an example of the configuration of the slitting device 100 according to this embodiment. FIG. 3 is a cross-sectional view of the slitting device 100 taken along the line II shown in FIG. 2. FIG. 4 is a partial enlarged view of the upper rotating unit 50A and the lower rotating unit 50B of the slitting device 100 according to this embodiment, showing a case where the shapes of a pair of slitting blades are different. FIG. 5 is a partial enlarged view of the upper rotating unit 50A and the lower rotating unit 50B of the slitting device 100, showing a case where the shapes of a pair of slitting blades are symmetrical from top to bottom.

[0027] 4 and 5, only half of the upper rotating section 50A and the lower rotating section 50B are shown from the rotation center. In the following description, a plated steel sheet S, in which a base steel sheet is coated with a plating as a coating material, will be used as an example of a multi-layer material to be cut by the slitting device 100. In FIGS. 1 to 5, the plated steel sheet S will be described with the sheet length direction as the X direction, the plated steel sheet S's width direction as the Y direction, and the plate thickness direction as the Z direction. The Y direction is also the sheet passing direction of the plated steel sheet S. The Z direction is also the direction in which the plated steel sheet S is clamped by the tools (slitting blades). The direction in which the plated steel sheet S is clamped by the tools (slitting blades) is also referred to as the "first direction." The opposing direction of a pair of tools (slitting blades) is also referred to as the "second direction." The second direction is perpendicular to the first direction.

[0028] The slitting equipment is equipment that cuts a plated steel sheet S, which is a cutting target, using a slitting device 100 equipped with a pair of rotating blades. As shown in FIG. 1 , for example, the slitting equipment includes a payoff reel 10, a tension generator 20, a tension reel 30, and the slitting device 100. The plated steel sheet S wound in a coil shape is paid out from the payoff reel 10, and in a state where tension is applied between the payoff reel 10 and the tension generator 20, the plated steel sheet S is cut by shear force using the slitting device 100. The slitting device 100 shown in FIG. 1 divides the plated steel sheet S into three pieces in the width direction. The plated steel sheet S cut by the slitting device 100 is wound into a coil shape by the tension reel 30.

[0029] 2, the slitting device 100 includes four pairs of slitting blades 1, 2, 3, and 4. Note that the slitting device 100 may include at least one pair of slitting blades. Each pair of slitting blades 1, 2, 3, and 4 includes a first slitting blade 111, 112, 113, and 114, which is a first tool, and a second slitting blade 121, 122, 123, and 124, which is a second tool. As shown in FIG. 4, the pair of first slitting blades 111, 112, 113, and 114 and the pair of second slitting blades 121, 122, 123, and 124 are arranged to face each other in a first direction (Z direction), which is the direction in which the plated steel sheet S is sandwiched.

[0030] 2 and 4 are different in shape from the second slit blades 121, 122, 123, 124. In a front view, the blade portions 111a, 112a, 113a, 114a of the first slit blades 111, 112, 113, 114 have a pressing surface orthogonal to the first direction (Z direction), a first vertical wall surface orthogonal to the pressing surface, and a tool inclined surface inclined with respect to the first direction (Z direction) between the pressing surface and the first vertical wall surface. On the other hand, the blade portions 121a, 122a, 123a, and 124a of the second slit blades 121, 122, 123, and 124 are right-angle blades having corners that are approximately right angles and are composed of a pressing surface that is perpendicular to the first direction (Z direction) and a first vertical wall surface that is perpendicular to the pressing surface.

[0031] 2 and 4, the slitting device 100 is configured such that at least one of the first slitting blades 111, 112, 113, 114 and the second slitting blades 121, 122, 123, 124 has a blade portion having a pressing surface, a tool inclined surface, and a first vertical wall surface. For example, as shown in Fig. 5, the first slitting blades 111, 112, 113, 114 and the second slitting blades 121, 122, 123, 124 may each have a blade portion having a pressing surface, a tool inclined surface, and a first vertical wall surface. The shape of the blade portion of the slit blades will be described in detail later.

[0032] The first slit blades 111, 112, 113, and 114 are supported at the center of rotation by a first shaft 115. The second slit blades 121, 122, 123, and 124 are supported at the center of rotation by a second shaft 125. As shown in Fig. 3, the first shaft 115 is rotatably supported at both ends by a pair of supports 103a and 103b via chocks 105a and 105b, and the second shaft 125 is rotatably supported at both ends by chocks 107a and 107b (the chocks 105a and 107a on the far side of the page are not shown). The pair of supports 103a and 103b are provided on a stand 101 as shown in Fig. 2.

[0033] Sleeves 151 and 153 may be provided between the support portions 103a and 103b, along with the first slit blades 111, 112, 113, and 114 and the second slit blades 121, 122, 123, and 124. The sleeves 151 and 153 are members for adjusting the spacing between the first slit blades 111, 112, 113, and 114 and the spacing between the second slit blades 121, 122, 123, and 124 (i.e., clearances, which will be described later). Although the sleeves 151 and 153 in Fig. 2 have different widths, the spacing between the first slit blades 111, 112, 113, and 114 and the spacing between the second slit blades 121, 122, 123, and 124 may be adjusted using only sleeves of the same width.

[0034] Hereinafter, the first slit blades 111, 112, 113, 114 and sleeves 151, 153 supported by the first shaft portion 115 will also be referred to as an upper rotating portion 50A. In addition, the second slit blades 121, 122, 123, 124 and sleeves 151, 153 supported by the second shaft portion 125 will also be referred to as a lower rotating portion 50B. The upper rotating portion 50A rotates integrally with the first shaft portion 115. The lower rotating portion 50B rotates integrally with the second shaft portion 125.

[0035] The pair of support portions 103a, 103b can be moved in the plate width direction (X direction) by drive portions 104a, 104b, respectively. For example, as shown in Fig. 2, the pair of support portions 103a, 103b are threadedly engaged with threaded portions 102a, 102b that are installed parallel to the first shaft portion 115 and the second shaft portion 125. One end of the threaded portions 102a, 102b is connected to drive portions 104a, 104b. The support portions 103a, 103b move when the drive portions 104a, 104b are driven to rotate the threaded portions 102a, 102b.

[0036] By driving the driving units 104a, 104b and moving the support units 103a, 103b in the plate width direction so as to separate them, one end of the first shaft unit 115 and one end of the second shaft unit 125 are released from the chocks. This makes it possible to remove the sleeves 151, 153, the first slit blades 111, 112, 113, 114, and the second slit blades 121, 122, 123, 124 from the first shaft unit 115 and the second shaft unit 125, and to change the slit blades or the sleeves that adjust the spacing between them.

[0037] Furthermore, screw-down devices 109a and 109b are provided above the support portions 103a and 103b as gap adjustment units that adjust the gap between the first slit blades 111, 112, 113, and 114 and the second slit blades 121, 122, 123, and 124. By tightening the screw-down devices 109a and 109b, the gap between the first slit blades 111, 112, 113, and 114 and the second slit blades 121, 122, 123, and 124 can be narrowed.

[0038] In the slitting device 100 according to this embodiment, the screw down devices 109a and 109b adjust the distance between the first slitting blades 111, 112, 113, and 114 and the second slitting blades 121, 122, 123, and 124 in accordance with the thickness of the plated steel sheet S. Thereafter, the plated steel sheet S is passed between the upper rotating part 50A and the lower rotating part 50B while being rotated, thereby cutting the plated steel sheet S. When the plated steel sheet S passes between the upper rotating part 50A and the lower rotating part 50B, the pairs of slitting blades 1, 2, 3, and 4 are gradually pushed in a first direction (Z direction), and the plated steel sheet S is cut by shear force.

[0039] At this time, due to tensile forces generated between the cutting edges of the first slit blades 111, 112, 113, 114 and the cutting edges of the second slit blades 121, 122, 123, 124 and the plated steel sheet S, the plating layer on the surface of the plated steel sheet S penetrates into the cut end surface, covering the cut end surface. That is, the plating layer on the surface of the plated steel sheet S follows the movement of the blade portions 111a, 112a, 113a, 114a of the first slit blades 111, 112, 113, 114 and the blade portions 121a, 122a, 123a, 124a of the second slit blades 121, 122, 123, 124 relative to the plated steel sheet S when it passes between the upper rotating part 50A and the lower rotating part 50B, causing the plating layer to penetrate into the cut end surface. As a result, the cut end surface of the plated steel sheet S is covered with the plating layer.

[0040] The above has described one configuration of the slitting device 100 according to this embodiment and the slitting equipment including the same. In the following description, the first slitting blades 111, 112, 113, and 114, which are the first tool, will be referred to as the "first slitting blade 110," and the second slitting blades 121, 122, 123, and 124, which are the second tool, will be referred to as the "second slitting blade 120." Similarly, the blade portions 111a, 112a, 113a, and 114a of the first slitting blades, which are the blade portions of the first tool, will be referred to as the "blade portion 110a," and the blade portions 121a, 122a, 123a, and 124a of the second slitting blades, which are the blade portions of the second tool, will be referred to as the "blade portion 120a."

[0041] [2. Coating of Cut End Surfaces with Coating Material] Parts using a multi-layer material are manufactured, for example, by cutting the multi-layer material with a cutting device and then processing it. At this time, the state of the cut end surface of the multi-layer material varies depending on the shape of the blade of the cutting device used to cut the multi-layer material. Below, the state of the cut end surface when a plated steel sheet 5, which is an example of a multi-layer material, is cut will be described in detail.

[0042] For example, in the slitting device 100 shown in Fig. 2, suppose that the blade portion 11a of the first slitting blade 11 and the blade portion 12a of the second slitting blade 12 are both right-angle blades formed of a pressing surface and a first vertical wall surface, as shown in Fig. 6. In this case, when a plated steel sheet 5 having a base material 5a, which is a steel sheet, coated on its upper surface (first surface) and lower surface (second surface) with a plating layer 5b is sandwiched and pressed between the first slitting blade 11 and the second slitting blade 12, a shear force is applied to the plated steel sheet 5, causing it to be cut.

[0043] As shown in FIG. 7 , the cut end surface 5 s at this time has, from the top surface, a shear surface and a fracture surface. The shear surface is a smooth surface formed by the movement of the first slit blade 11 embedded in the plated steel sheet 5, and the fracture surface is a surface where the plated steel sheet 5 is fractured due to a crack that has occurred in the plated steel sheet 5. As shown in FIG. 7 , at the cut end surface 5 s of the plated steel sheet 5, almost no plating layer 5 b remains on the shear surface, and the base material 5 a is exposed at the fracture surface. Therefore, at such a cut end surface 5 s, the effect obtained by the plating as a coating material is not exhibited, and there is a concern that red rust may occur at the cut end surface 5 s. Furthermore, because the fracture surface is along the sheet thickness direction, when the cut end surface is viewed from a direction perpendicular to the sheet thickness direction, the rusted fracture surface can be seen, which may be aesthetically undesirable.

[0044] 6, the shear surface is small, and therefore the coating does not wrap around from the top and bottom surfaces to the cut edge of the plated steel sheet 5. Furthermore, stress is concentrated at the corners of the upper and lower tools, causing cracks to form connecting these corners, resulting in an early cutting time and a larger exposed area of ​​the base material 5a (i.e., fracture surface). Furthermore, because the fracture surface is located in a position that is easily visible, rust or other damage to the fracture surface is easily noticeable.

[0045] Therefore, after extensive research, the inventors of the present application came up with the idea of ​​providing at least one of the blade portion 110a of the first slit blade 110 and the blade portion 120a of the second slit blade 120 with a tapered inclined surface (tool inclined surface) and increasing the clearance between the blade portion 110a of the first slit blade 110 and the blade portion 120a of the second slit blade 120. By using such a tool, the plating coverage rate of the cut end surface 5s of the plated steel sheet 5 can be increased, and the fracture surface, which becomes the exposed base metal portion, can be aligned with the surface of the plated steel sheet 5. In other words, the fracture surface of the plated steel sheet 5 cut with such a tool is aligned not in the thickness direction but in a direction perpendicular to the thickness direction.

[0046] When the plated steel sheet 5 cut by such a slitting device 100 is made into a product, while the first surface is in a position where it can be seen, the fracture surface where the bare metal is exposed is located along the second surface and therefore is less noticeable. Furthermore, since the fracture surface is located along the second surface, the fracture surface is less likely to be exposed to a corrosive environment than when the fracture surface is located along the thickness direction of the sheet, and rust generation can be suppressed. Below, the configurations of the two blades and the shape of the plated steel sheet cut by a tool having those blades will be described.

[0047] [2-1. Blade Configuration A: Cutting by a Blade Having an Inclined Tool Surface] For example, as shown in FIG. 8 , the blade 110a of the first slit blade 110 has a shape (also referred to as “blade configuration A”) that includes a pressing surface S1, a first vertical wall surface S2 perpendicular to the pressing surface S1, and a tool inclined surface S3 inclined with respect to a first direction between the pressing surface S1 and the first vertical wall surface S2. In this case, the blade 120a of the second slit blade 120 may be a right-angle blade configured by the pressing surface S1 and the first vertical wall surface S2. Furthermore, for example, as shown in FIG. 9 , the blade 110a of the first slit blade 110 and the blade 120a of the second slit blade 120 may have blade configuration A that includes the pressing surface S1, the first vertical wall surface S2, and the tool inclined surface S3. Here, the tool inclined surface S3 is inclined by θ [°] with respect to the first direction (Z direction). The angle formed between the pressing surface S1 and the tool inclined surface S3 is an obtuse angle (90°+θ).

[0048] 8 and 9, the first slit blade 110 and the second slit blade 120 are arranged so as to satisfy the following formula (1), where n=0.3+(-0.15)×(1-cos4θ) and m=0.4.

[0049] n<C / d<m...(1)

[0050] C [mm] is the clearance between the blade portion 110a of the first slit blade 110 and the blade portion 120a of the second slit blade 120, and d [mm] is the distance between the pressing surfaces S1 of the first slit blade 110 and the pressing surface S1 of the second slit blade 120 when they abut against the plated steel sheet 5 to be cut. Clearance C is the distance between the cutting edge 110b of the blade portion 110a of the first slit blade 110 and the cutting edge 120b of the blade portion 120a of the second slit blade 120. Note that the cutting edges 110b, 120b are located at the end of the pressing surface S1 on the other tool side in the second direction in which the pair of first slit blades 110 and second slit blades 120 face each other. The distance d between the pressing surfaces corresponds to the sheet thickness t of the plated steel sheet 5 to be cut.

[0051] 10 and 11 show an example of a cut end surface 5s of a plated steel sheet 5 cut by the pair of slit blades shown in FIGS. 8 and 9. Note that FIGS. 10 and 11 show the cut end surface 5s on the side where the surface (upper surface, first surface) facing the tool inclined surface S3 of the first slit blade 110 shown in FIGS. 8 and 9 is pressed in by the tool inclined surface S3. FIG. 10 is a schematic diagram of the cut end surface when the clearance C is 5 to 10% of the distance d between the pressing surfaces S1. FIG. 11 is a schematic diagram of the cut end surface when the clearance C is 20% or more of the distance d between the pressing surfaces S1.

[0052] As shown in Figures 10 and 11, the cut end surface 5s has, from the upper surface (first surface), an inclined surface inclined with respect to the plate thickness direction, and a fracture surface connecting the inclined surface and the lower surface (second surface).

[0053] The inclined surface is a surface formed along the tool inclined surface S3 of the blade portion 110a of the first slit blade 110, and is inclined with respect to the sheet thickness direction. At least a portion of the inclined surface is covered with a plating layer 5b that continues from the upper surface (first surface). The fracture surface is a surface where the plated steel sheet 5 is fractured, with a crack occurring in the plated steel sheet 5 as the origin. The fracture surface is along a direction (i.e., second direction (X direction)) perpendicular to the sheet thickness direction (i.e., first direction (Z direction)). In other words, the fracture surface extends along the second surface.

[0054] By increasing the clearance C between the blade portion 110a of the first slit blade 110 and the blade portion 120a of the second slit blade 120 to 5% or more of the distance d between the pressing surfaces S1, the proportion of the inclined surface increases, delaying the start of cutting in the thickness direction of the plated steel sheet 5. Then, due to the load in the width direction generated as a component force by the tool inclined surface S3 of the slit blade, cutting progresses in the width direction before progressing in the thickness direction. As a result, as shown in Figures 10 and 11 , the fracture surface appears to extend along the second surface.

[0055] If the second surface is the back surface of the plate, the fracture surface, which is the exposed portion of the base metal, is exposed on the second surface and therefore difficult to see from the outside. Therefore, even if rust occurs on the fracture surface, it is not noticeable. Furthermore, if the second surface where the fracture surface is exposed can be joined to other components or placed indoors, the progression of corrosion on the fracture surface can be delayed, which is better from the perspective of corrosion resistance than when the fracture surface is along the plate thickness direction. Furthermore, since the fracture surface is along the second surface, no burrs protruding from the second surface are generated. Therefore, it is possible to prevent burrs from coming into contact with equipment that processes the plated steel sheet after cutting and damaging the equipment.

[0056] In the cut plated steel sheet 5, the upper surface (first surface) intersects with the inclined surface. At this time, the interior angle α between the upper surface and the inclined surface is an obtuse angle of approximately +90°, which is the inclination angle (taper angle) θ of the tool inclined surface (described later). Furthermore, the lower surface (second surface) intersects with the fracture surface. Since the plated steel sheet 5 is cut obliquely from the upper surface side to the lower surface side by the tool inclined surface S3 of the blade portion 110a of the first slit blade 110, an inclined surface that slopes in one direction from the upper surface side to the lower surface side is formed on the cut end surface 5s.

[0057] At least a portion of the inclined surface of the cut end surface 5s of the plated steel sheet 5 is covered with a coating material that continues from the upper surface (first surface). For example, in the cut end surface 5s of the plated steel sheet 5 shown in FIG. 10, the plating layer 5b on the upper surface wraps around and covers the inclined surface. Note that although the entire inclined surface in FIG. 10 is covered with the plating layer 5b that continues from the upper surface (first surface), depending on the cutting method, the plating layer 5b on the upper surface that wraps around the inclined surface may fade, resulting in the inclined surface being discontinuously covered with the plating layer 5b. Even in such cases, the effect of the plating, which is the coating material, can be obtained at the cut end surface 5s because there is a portion of the inclined surface covered by the plating layer 5b that continues from the upper surface (first surface).

[0058] On the other hand, as described above, the fracture surface appears in the sheet width direction, i.e., along the second surface. When the clearance C between the blade portion 110a of the first slitting blade 110 and the blade portion 120a of the second slitting blade 120 during cutting satisfies the above formula (1), as long as the clearance C is small, the fracture surface consists of two surfaces, the first fracture surface 5p and the second fracture surface 5q, as shown in Figure 10. The first fracture surface 5p and the second fracture surface 5q intersect, and the intersection angle γ is less than 90°. When the clearance C increases, the fracture surface becomes a single surface along the second surface, as shown in Figure 11.

[0059] Furthermore, the length of the fracture surface in the sheet width direction of the plated steel sheet 5 cut by the pair of slit blades according to this embodiment is desirably 30% or less of the sheet thickness of the plated steel sheet 5, which is a multi-layer material. This makes it possible to reduce the area in which the base material 5a is exposed.

[0060] 12, the blade portion 110a of the first slit blade 110 may have a shape (also referred to as "blade portion shape B") that includes a pressing surface S1, a first vertical wall surface S2 perpendicular to the pressing surface S1, a tool inclined surface S3 between the pressing surface S1 and the first vertical wall surface S2 that is inclined from the first vertical wall surface S2 in the first direction, and a second vertical wall surface S4 extending along the first direction between the tool inclined surface S3 and the pressing surface S1. The blade portion 120a of the second slit blade 120 may be a right-angle blade that includes the pressing surface S1 and the first vertical wall surface S2, as in FIG. 13, the blade portion 110a of the first slit blade 110 and the blade portion 120a of the second slit blade 120 may have a blade configuration B having a pressing surface S1, a first vertical wall surface S2, a tool inclined surface S3, and a second vertical wall surface S4. Here, the tool inclined surface S3 is inclined by θ [°] with respect to the first direction (Z direction). The angle between the pressing surface S1 and the tool inclined surface S3 is an obtuse angle (90° + θ).

[0061] 12 and 13, the first slit blade 110 and the second slit blade 120 are arranged to satisfy the above formula (1). When the slit blades 110, 120 have the second vertical wall surface S4, n = 0.3 + (0.0625x - 0.15) × (1 - cos 4θ), m = 0.4. x [mm] is the length of the second vertical wall surface in the first direction. When x = 0, the blade configuration A is used. By providing the second vertical wall surface S4 on the blade portions 110a, 120a, the plated steel sheet 5 can be cut reliably.

[0062] 14 and 15 show an example of a cut end surface 5s of a plated steel sheet 5 cut by the pair of slit blades shown in FIGS. 12 and 13. Note that FIGS. 14 and 15 show the cut end surface 5s on the side where the surface (upper surface, first surface) facing the tool inclined surface S3 of the first slit blade 110 shown in FIGS. 12 and 13 is pressed in by the tool inclined surface S3. FIG. 14 is a schematic diagram of the cut end surface when the clearance C is 5 to 10% of the distance d between the pressing surfaces S1. FIG. 15 is a schematic diagram of the cut end surface when the clearance C is 20% or more of the distance d between the pressing surfaces S1.

[0063] As shown in Figures 14 and 15, the cut end surface 5s has, in order from the top surface (first surface), an inclined surface inclined with respect to the plate thickness direction, a vertical wall surface extending along the plate thickness direction and continuing from the inclined surface, and a fracture surface connecting the vertical wall surface and the bottom surface (second surface).

[0064] The inclined surface is a surface formed along the tool inclined surface S3 of the blade portion 110a of the first slit blade 110 and is inclined with respect to the sheet thickness direction. At least a portion of the inclined surface is covered with a plating layer 5b that continues from the upper surface (first surface). The vertical wall surface is a surface formed along the second vertical wall surface S4 of the blade portion 110a of the first slit blade 110. The vertical wall surface is along the sheet thickness direction and is covered with a plating layer 5b that continues from the inclined surface. The fracture surface is a surface where the plated steel sheet 5 is fractured, originating from a crack that has occurred in the plated steel sheet 5. The fracture surface is along a direction (i.e., a second direction (X direction)) that is perpendicular to the sheet thickness direction (i.e., a first direction (Z direction)). In other words, the fracture surface extends along the second surface.

[0065] In this case, too, by increasing the clearance C between the blade portion 110a of the first slit blade 110 and the blade portion 120a of the second slit blade 120 to 5% or more of the distance d between the pressing surfaces S1, the proportion of the inclined surface increases, delaying the start of cutting in the thickness direction of the plated steel sheet 5. Then, due to the load in the width direction generated as a component force by the tool inclined surface S3 of the slit blade, cutting progresses in the width direction before progressing in the thickness direction. As a result, as in Figures 10 and 11, the fracture surface appears to extend along the second surface, as shown in Figures 14 and 15.

[0066] Therefore, if the second surface is the back surface of the plate, the fracture surface, which is the exposed portion of the base metal, is exposed on the second surface and is therefore difficult to see from the outside. Therefore, even if rust occurs on the fracture surface, it is not noticeable. Furthermore, if the second surface, where the fracture surface is exposed, can be joined to other components or placed indoors, the progression of corrosion on the fracture surface can be delayed, which is better from the perspective of corrosion resistance than when the fracture surface is along the plate thickness direction. Furthermore, since the fracture surface is along the second surface, no burrs protruding from the second surface are generated. Therefore, it is possible to prevent burrs from coming into contact with equipment that processes the plated steel sheet after cutting and damaging the equipment.

[0067] The shape of the cut plated steel sheet 5 shown in Figures 14 and 15 is the same as that shown in Figures 10 and 11 except for the presence of vertical wall surfaces. That is, the upper surface (first surface) intersects with the inclined surface. The interior angle α between the upper surface and the inclined surface is an obtuse angle of approximately +90°, which is the inclination angle (taper angle) θ of the tool inclined surface (described later). The lower surface (second surface) intersects with the fracture surface. The tool inclined surface S3 of the blade portion 110a of the first slit blade 110 cuts the plated steel sheet 5 obliquely from the upper surface side to the lower surface side, so that the cut end surface 5s forms an inclined surface that slopes in one direction from the upper surface side to the lower surface side.

[0068] At least a portion of the inclined surfaces and vertical wall surfaces of the cut end surface 5s of the plated steel sheet 5 is covered with a coating material that is continuous from the upper surface (first surface). For example, in the cut end surface 5s of the plated steel sheet 5 shown in FIG. 14, the plating layer 5b on the upper surface wraps around and covers the inclined surfaces and vertical wall surfaces. Note that although the inclined surfaces and vertical wall surfaces in FIG. 14 are all covered with the plating layer 5b that is continuous from the upper surface (first surface), depending on the cutting method, the plating layer 5b on the upper surface that wraps around the inclined surfaces may fade, resulting in discontinuous coverage of the inclined surfaces and vertical wall surfaces. Even in such cases, the effect of the plating, which is the coating material, can be obtained at the cut end surface 5s because the plating layer 5b that is continuous from the upper surface (first surface) covers portions of the inclined surfaces and vertical wall surfaces.

[0069] On the other hand, the fracture surface appears in the sheet width direction, i.e., along the second surface. When the clearance C between the blade portion 110a of the first slitting blade 110 and the blade portion 120a of the second slitting blade 120 during cutting satisfies the above formula (1), as long as the clearance C is small, the fracture surface consists of two surfaces, the first fracture surface 5p and the second fracture surface 5q, as shown in Figure 14. The first fracture surface 5p and the second fracture surface 5q intersect, and the intersection angle γ is less than 90°. When the clearance C increases, the fracture surface becomes a single surface along the second surface, as shown in Figure 11.

[0070] Furthermore, the length of the fracture surface in the sheet width direction of the plated steel sheet 5 cut by the pair of slit blades according to this embodiment is desirably 30% or less of the sheet thickness of the plated steel sheet 5, which is a multi-layer material. This makes it possible to reduce the area in which the base material 5a is exposed.

[0071] As shown in Figures 8 and 12, when the blade portion 110a of the first slit blade 110 has blade portion form A or blade portion form B and the blade portion 120a of the second slit blade 120 is a right-angle blade composed of a pressing surface S1 and a first vertical wall surface S2, one of the two pieces of the plated steel sheet 5 after cutting has a cut end surface 5s as shown in Figures 10, 11, 14, and 15 (the plated steel sheet Sa after cutting in Figure 4).

[0072] However, the cut end surface 5s of the other plated steel sheet 5 is not coated with plating and becomes scrap (the plated steel sheet Sb after cutting in FIG. 4 ). As shown in FIG. 9 or 13 , if the blade portion 110a of the first slitting blade 110 and the blade portion 120a of the second slitting blade 120 have the blade portion form A or the blade portion form B, both of the plated steel sheets 5 after cutting can have the cut end surfaces 5s as shown in FIG. 10 , 11 , 14 , and 15 (the plated steel sheet Sa after cutting in FIG. 5 ).

[0073] [3. Tool Configuration] The clearance C of the pair of slit blades 110, 120 according to this embodiment, as well as the blade configuration A or blade configuration B, will be described in detail below, as shown in Figures 8, 9, 12, and 13. While the blade configuration A and blade configuration B will be described for the first slit blade 110, the same applies to the second slit blade 120. Note that Figures 8, 9, 12, and 13 show the blade 110a when the first slit blade 110 cuts in a plane including the rotation axis of the first slit blade 110. In the following description, a plated steel sheet 5 will be taken as an example of a multi-layer material to be cut.

[0074] First, the clearance C between the pair of slit blades 110, 120 is set to satisfy the above formula (1). By cutting the plated steel sheet 5 using the pair of slit blades 110, 120 according to this embodiment, the fracture surface, which will become the bare metal exposed portion, can be exposed along the second surface, as shown in Figures 10, 11, 14, and 15. To achieve this, it is necessary to establish a relationship in which the blade penetration depth at which cutting begins in the sheet width direction (second direction) perpendicular to the sheet thickness direction (first direction) is smaller than the blade penetration depth at which cutting ends in the sheet thickness direction (first direction). The start of cutting in the sheet width direction (second direction) is delayed as the clearance C increases. In other words, increasing the clearance C delays the start of cutting in the first direction, which is the sheet thickness direction, and allows cutting in the second direction, which is the sheet width direction, to progress earlier.

[0075] On the other hand, the greater the clearance C, the more difficult it becomes to cut the workpiece. Even if the clearance C is increased, if the thickness t of the plated steel sheet 5 to be cut is small, the plated steel sheet 5 can be cut, but if the thickness t is large, there is a possibility that the plated steel sheet 5 cannot be cut. Therefore, by setting the ratio (C / d) of the clearance C to the distance d between the pressing surfaces S1, which corresponds to the thickness t of the plated steel sheet 5 to be cut, to satisfy the above formula (1), it is possible to expose the fracture surface of the cut plated steel sheet 5 along the second surface and to reliably cut the plated steel sheet 5.

[0076] By making the ratio (C / d) of the clearance C to the distance d between the pressing surfaces S1 larger than the coefficient n (= 0.3 + (0.0625x - 0.15) × (1 - cos 4θ)), the fracture surface of the cut plated steel sheet 5 can be exposed along the second surface. Furthermore, by making the ratio (C / d) of the clearance C to the distance d between the pressing surfaces S1 smaller than the coefficient m = 0.4, the plated steel sheet 5 to be cut can be reliably cut.

[0077] As for the shape of the blade portion, the blade portion 110a of the first slit blade 110 of blade portion form A shown in Figures 8 and 9 above has a pressing surface S1, a first vertical wall surface S2 perpendicular to the pressing surface S1, and a tool inclined surface S3 inclined with respect to the first direction between the pressing surface S1 and the first vertical wall surface S2. The blade portion 110a of the first slit blade 110 of blade portion form B shown in Figures 12 and 13 has a second vertical wall portion S4 between the tool inclined surface S3 of blade portion form A and the pressing surface S1. It is desirable that such a blade portion 110a satisfy the following shape.

[0078] (Inclination angle (taper angle) θ of tool inclined surface) The inclination angle (taper angle) θ of the tool inclined surface s1 relative to the pushing direction is preferably 15° or more and 45° or less. If the inclination angle θ is 15° or more, it is possible to ensure cutting timing that allows the plating of the plating layer 5b of the plated steel sheet 5 to sufficiently wrap around the inclined surface. If the inclination angle θ is around 5°, the cutting timing will be similar to that of a right-angle blade.

[0079] Meanwhile, the first slit blade 110 is subjected to a load not only in the clamping direction (first direction) of the plated steel sheet 5 but also in the axial direction (second direction). As the inclination angle θ increases, the axial load increases, resulting in excessive load on the equipment. If the inclination angle θ is 45° or less, the axial load on the first slit blade 110 does not become too large, and cutting can be performed within the load capacity of the equipment. If the inclination angle θ is greater than 45°, the increase in the coating wraparound effect obtained with respect to the increase in load is not as significant. For this reason, the inclination angle (taper angle) θ of the tool inclined surface S3 with respect to the first direction is preferably set to be 15° or more and 45° or less.

[0080] (Length x of Second Vertical Wall Surface) In blade portion configuration B, the length x of the second vertical wall surface S4 in the first direction is preferably 0.1 mm or more and 0.8 mm or less. The second vertical wall surface S4 is provided to securely grip the plated steel sheet 5. If the length x of the second vertical wall surface S4 is 0.1 mm or more, the cutting ability of the tool for the workpiece can be improved. Furthermore, if the length x of the second vertical wall surface S4 is 0.1 mm or more, the cutting of the blade portion 110a can be facilitated. Furthermore, the blade portion 110a of the slit blade 110 wears with use. If the length x of the second vertical wall surface S4 is 0.1 mm or more, the life of the slit blade 110 due to wear can be extended and replacement frequency can be reduced. On the other hand, if the length x of the second vertical wall surface S4 is 0.8 mm or less, cutting similar to that of a right-angle blade can be avoided. Thus, the length x of the second vertical wall surface S4 in the first direction is preferably 0.1 mm or more and 0.8 mm or less.

[0081] The radius of curvature of the cutting edge 110b of the blade portion 110a (i.e., the corner where the tool inclined surface S3 and the pressing surface S1 intersect, or the corner where the second vertical wall surface S4 and the pressing surface S1 intersect) is not particularly limited, but may be 0.1 mm or less. The radius of curvature of the cutting edge 110b does not depend on the thickness of the plated steel sheet 5 to be cut, and may be set appropriately depending on the material of the plated steel sheet 5, etc.

[0082] As described above, the clearance C between the pair of slit blades 110, 120 and the distance d between the pressing surfaces S1 are set to satisfy the above formula (1), and the blade shape of at least one of the slit blades 110 (120) is set to blade form A or blade form B. By using such slit blades 110, 120 to cut the plated steel sheet 5, the inclined portion P1 of the blade portion 110a compresses the plating of the plating layer 5b, including the base material 5a, in the pressing direction (sheet thickness direction), causing it to wrap around the inclined surface and vertical wall surface of the cut end surface, and exposing the fracture surface along the second surface. Furthermore, the plated steel sheet 5 can be reliably cut.

[0083] A simulation simulating slit cutting was conducted to verify the effects of the present invention. In this verification, a simulation of slit cutting was conducted using the slitting device 100 shown in Figure 2. The coating material to be cut was a Zn-plated steel sheet with a thickness of 4.0 mm. The upper and lower tools had the same shape, and the clearance C between the pair of slit blades, the inclination angle θ of the tool inclined surface of the slit blade, and the length x of the second vertical wall surface were varied to investigate whether the plated steel sheet could be cut, and the direction and shape of the fracture surface when cut. The results are shown in Table 1 below.

[0084]

[0085] In Examples 1 to 13, the shape of the slit blade was blade configuration A shown in FIG. 9 or blade configuration B shown in FIG. 13, and the clearance C satisfied the above formula (1). Therefore, when a plated steel sheet was cut with such a pair of slit blades, the fracture surface appeared along the sheet width direction. FIG. 16 shows the shapes of the cut end surfaces of Examples 5 and 13. In Example 5, the fracture surface shape consisted of a first fracture surface and a second fracture surface, as shown in FIG. 14. In Example 13, the clearance C was larger than in Example 5, and the fracture surface consisted of a single surface along the sheet width direction.

[0086] On the other hand, in Comparative Examples 1, 4-7, 9, and 12, the clearance C was large relative to the distance between the pressing surfaces of the pair of slit blades (i.e., the thickness of the plated steel sheet to be cut), and therefore the plated steel sheet could not be cut (e.g., Comparative Example 6 in FIG. 16 ). Also, in Comparative Examples 2, 3, 8, 10, and 11, although the plated steel sheet could be cut, the clearance C was small relative to the distance between the pressing surfaces of the pair of slit blades (i.e., the thickness of the plated steel sheet to be cut), and as a result, the fracture surface appeared in the plate thickness direction (e.g., Comparative Example 3 in FIG. 16 ).

[0087] Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art to which the present invention pertains can conceive of various modifications and alterations within the scope of the technical ideas set forth in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

[0088] For example, in the above embodiment, a slitting device having a pair of slit blades has been described as the cutting device, but the present invention is not limited to such an example. For example, the cutting device according to the present invention may have a first tool and a second tool, and the blade portion of at least one of the first tool or the second tool may have blade portion configuration A, which has a pressing surface, a first vertical wall surface, and a tool inclined surface, or blade portion configuration B, which has a pressing surface, a first vertical wall surface, a tool inclined surface, and a second vertical wall surface. In this case, the tools are positioned so that the tool clearance C satisfies the above formula (1). For example, the cutting device may be a stamping die or a shear cutting machine for punching.

[0089] The pressing die includes a punch and a die. In this case, for example, a punch 200 having a shape as shown in Fig. 17 is used. The punch 200 has a pressing surface S1, a first vertical wall surface S2, a tool inclined surface S3, and a second vertical wall surface S4. The cross-sectional shape passing through the central axis of the punch 200 is the same as that shown in Fig. 12. The shape of the punch 200 shown in Fig. 17 is blade portion form B, but it may also be blade portion form A, which does not have the second vertical wall surface S4.

[0090] The shear of the shear cutting machine may have the shape of a shear 300, for example, as shown in Fig. 18. The shear 300 has a pressing surface S1, a first vertical wall surface S2, a tool inclined surface S3, and a second vertical wall surface S4. The side shape of the shear 300 is the same as that shown in Fig. 12. The shape of the shear 300 shown in Fig. 18 is blade form B, but it may also be blade form A, which does not have the second vertical wall surface S4.

[0091] In this way, it is sufficient that the blade portion of at least one of the first tool and the second tool of the cutting device according to this embodiment has a cross-sectional shape as shown in Blade Form A or Blade Form B.

[0092] In addition, since it is common for only one of the cut multi-layer materials to be used as a product in an injection mold, it is sufficient for either the first tool or the second tool to have a blade with blade form A or blade form B. On the other hand, in a slitting device or a shear cutting machine, all of the cut multi-layer material may be used as a product, so both the first tool and the second tool may have a blade with blade form A or blade form B.

[0093] Furthermore, for example, in the above embodiment, the multilayer material was a plated steel sheet, but the multilayer material may be formed by coating the surface of a base material with a coating material. For example, the base material may be not only a steel sheet but also other metal materials, and the coating material may be a material made of Zn, Al, or an alloy thereof, an oxide coating, a paint material, a resin material, or the like. Additionally, the multilayer material may be a painted steel sheet in which the surface of the base metal material is painted, or a film-laminated steel sheet in which a film is laminated to a steel sheet. Alternatively, the coating material may be a clad material. For example, the multilayer material may be a Ni-clad copper material in which a Cu plate is used as the base material and a Ni plate is used as the coating material.

[0094] Furthermore, the coating material constituting the multi-layer material is not limited to a single layer, but may be multiple layers. For example, the surface of the above-mentioned plated steel sheet may be subjected to a chemical conversion treatment, painting, lamination, or the like.

[0095] Furthermore, the multi-layer material may be a multi-layer material in which a resin material such as plastic is used as the base material and a metal material such as Cu, Cr, Ag, Au, or Pt is used as the coating material. When a resin material such as plastic coated with a metal is cut, the electrical conductivity of the end surface is lost. Furthermore, if the ratio of exposed resin is high, it becomes more likely to become charged, which may cause concerns about sparks. Therefore, by making the cut end surface of such a resin material have the same shape as the cut end surface of the multi-layer material according to this embodiment, it is possible to improve the electrical conductivity of the cut end surface and prevent charging.

[0096] Furthermore, in the case of clad materials, the objectives required when cutting differ depending on the combination with the coating material and the application. However, by forming the cut end surface into a shape similar to that of the multilayer material according to this embodiment, the effect of the coating material can improve the corrosion resistance, chemical resistance, etc. of the base material at the cut end surface. Furthermore, the electrical conductivity, thermal conductivity, magnetism, etc. of a part or the entire cut end surface can be improved compared to conventional cutting methods.

[0097] In the case of a coating film or laminate, by making the cut end surface the same shape as the cut end surface of the multilayer material according to this embodiment, it is possible to realize not only the corrosion resistance of the base material at the cut end surface, but also the suppression of swelling under the coating film-film, the improvement of appearance by suppressing exposure of the base material, and the improvement of insulation properties of part or all of the cut end surface.

[0098] In this way, by making the shape of the cut end surface of the multilayer material the shape of the cut end surface according to this embodiment, it becomes possible to exert the effects obtained by the covering material on the top and bottom surfaces also on the cut end surface. Note that the effects obtained by the covering material are not limited to the above examples, and the effects can be exerted depending on the application of the covering material.

[0099] The following configurations are also included in the technical scope of the present invention. (1) A cutting device that cuts a workpiece sandwiched in a first direction between a first tool and a second tool, wherein the first tool and the second tool have blades arranged facing each other in the first direction, the blades of the first tool and the second tool have a pressing surface perpendicular to the first direction and a first vertical wall surface perpendicular to the pressing surface, at least one of the blades of the first tool or the second tool has a tool inclined surface inclined with respect to the first direction between the pressing surface and the first vertical wall surface, and the angle formed by the pressing surface and the tool inclined surface is an obtuse angle, and a clearance C [mm] between the first tool and the second tool and a distance d [mm] between the pressing surfaces of the first tool and the pressing surface of the second tool when they abut against the workpiece to be cut satisfy the following formula (A). n<C / d<m (A) where n=0.3+(-0.15)×(1-cos4θ) and m=0.4. θ [°] is the inclination angle of the tool inclined surface with respect to the first direction. (2) The cutting device according to (1) above, wherein the inclination angle θ is 15° or more and 45° or less. (3) The cutting device according to (1) or (2) above, wherein the first tool and the second tool each include the tool inclined surface. (4) The cutting device according to (3) above, wherein the shape of the first tool and the shape of the second tool are symmetrical. (5) The cutting device according to any one of (1) to (4) above, wherein at least one of the blade portion of the first tool or the blade portion of the second tool has a second vertical wall surface between the pressing surface and the tool inclined surface, the second vertical wall surface being perpendicular to the pressing surface, and wherein formula (A) is satisfied, where n = 0.3 + (0.0625x - 0.15) × (1 - cos 4θ) and m = 0.4. Here, x [mm] is the length of the second vertical wall surface in the first direction. (6) The cutting device according to (5) above, wherein the length x of the second vertical wall surface is 0.1 mm or more and 0.8 mm or less.(7) A cutting method for cutting a workpiece sandwiched in a first direction by a first tool and a second tool, wherein a blade portion of the first tool and a blade portion of the second tool have a pressing surface orthogonal to the first direction and a first vertical wall surface orthogonal to the pressing surface, at least one of the blade portion of the first tool or the blade portion of the second tool has a tool inclined surface inclined with respect to the first direction between the pressing surface and the first vertical wall surface, and the angle formed by the pressing surface and the tool inclined surface is an obtuse angle, and the workpiece is sandwiched and cut by the first tool and the second tool so that a clearance C [mm] between the first tool and the second tool and a distance d [mm] between the pressing surfaces when the pressing surfaces of the first tool and the second tool abut against the workpiece to be cut satisfy the following formula (A): n<C / d<m (A) where n=0.3+(-0.15)×(1-cos 4θ) and m=0.4, and θ [°] is the inclination angle of the tool inclined surface with respect to the first direction. (8) The cutting method according to (7) above, wherein at least one of the blade portion of the first tool or the blade portion of the second tool has a second vertical wall surface between the pressing surface and the tool inclined surface, the second vertical wall surface being perpendicular to the pressing surface, and the workpiece is sandwiched and cut between the first tool and the second tool so that a clearance C [mm] between the first tool and the second tool and a distance d [mm] between the pressing surfaces of the first tool and the second tool when the pressing surfaces of the first tool and the second tool abut against the workpiece to be cut satisfy the formula (A) where n = 0.3 + (0.0625x - 0.15) × (1 - cos 4 θ) and m = 0.4, where x [mm] is the length of the second vertical wall surface in the first direction.(9) A multi-layer material having a base material surface coated with a coating material, the multi-layer material having a cut end surface along the plate thickness direction from a first surface to a second surface, the cut end surface having, in order, an inclined surface inclined from the first surface in the plate thickness direction, a vertical wall surface along the plate thickness direction continuing from the inclined surface, and a fracture surface connecting the vertical wall surface and the second surface, or having, in order, an inclined surface inclined from the first surface in the plate thickness direction and a fracture surface connecting the inclined surface and the second surface, at least a part of the inclined surface is covered with a coating material continuing from the first surface, and at least a part of the fracture surface is along the second surface. (10) The multi-layer material according to (9) above, wherein the length of the fracture surface in the plate width direction is 30% or less of the plate thickness of the multi-layer material. (11) The multilayer material according to (9) or (10) above, wherein the first surface intersects with the inclined plane, and an interior angle between the first surface and the inclined plane is an obtuse angle. (12) The multilayer material according to any one of (9) to (11) above, wherein the fracture surface comprises a first fracture surface and a second fracture surface, and the first fracture surface intersects with the second fracture surface. (13) The multilayer material according to (12) above, wherein the intersection angle between the first fracture surface and the second fracture surface is less than 90°. (14) The multilayer material according to any one of (9) to (13) above, wherein the coating material is made of Zn, Al, or an alloy thereof. (15) The multilayer material according to any one of (9) to (14) above, wherein the base material is a steel plate.

[0100] 5 Plated steel sheet (multilayer material) 5a Base material 5b Plated layer (coating material) 5s Cutting end surface 10 Payoff reel 11 First slitting blade 11a Blade portion (of first slitting blade) 12 Second slitting blade 12a Blade portion (of second slitting blade) 20 Tension generating device 30 Tension reel 100 Slitting device 110 First slitting blade 110a Blade portion (of first slitting blade) 110b Blade tip 120 Second slitting blade 120a Blade portion (of second slitting blade) 120b Blade tip 200 Punch 300 Shear S1 Pressing surface S2 First vertical wall surface S3 Tool inclined surface S4 Second vertical wall surface

Claims

1. A cutting device that cuts a workpiece sandwiched in a first direction between a first tool and a second tool, wherein the first tool and the second tool have respective blades arranged facing each other in the first direction, the blade of the first tool and the blade of the second tool have a pressing surface perpendicular to the first direction and a first vertical wall surface perpendicular to the pressing surface, at least one of the blade of the first tool or the blade of the second tool has a tool inclined surface inclined with respect to the first direction between the pressing surface and the first vertical wall surface, and an angle formed between the pressing surface and the tool inclined surface is an obtuse angle, and a clearance C [mm] between the first tool and the second tool and a distance d [mm] between the pressing surfaces when the pressing surface of the first tool and the pressing surface of the second tool abut against the workpiece to be cut satisfy the following formula (A). n<C / d<m (A) where n=0.3+(-0.15)x(1-cos4θ) and m=0.4, and θ[°] is the inclination angle of the tool inclined surface with respect to the first direction.

2. The cutting device according to claim 1, wherein the inclination angle θ is greater than or equal to 15° and less than or equal to 45°.

3. The cutting device according to claim 1 or 2, wherein the first tool and the second tool each have a tool inclined surface.

4. The cutting device according to claim 3, wherein the shape of said first tool and the shape of said second tool are symmetrical.

5. The cutting device according to claim 1 or 2, wherein at least one of the blade of the first tool and the blade of the second tool has a second vertical wall surface between the pressing surface and the tool inclined surface, which is perpendicular to the pressing surface, and satisfies the formula (A) where n = 0.3 + (0.0625x - 0.15) x (1 - cos4θ) and m = 0.4, where x [mm] is the length of the second vertical wall surface in the first direction.

6. The cutting device according to claim 5, wherein the length x of the second vertical wall surface is not less than 0.1 mm and not more than 0.8 mm.

7. A cutting method for cutting a workpiece clamped in a first direction between a first tool and a second tool, wherein a blade portion of the first tool and a blade portion of the second tool have a pressing surface perpendicular to the first direction and a first vertical wall surface perpendicular to the pressing surface, at least one of the blade portion of the first tool or the blade portion of the second tool has a tool inclined surface inclined with respect to the first direction between the pressing surface and the first vertical wall surface, and an angle between the pressing surface and the tool inclined surface is an obtuse angle, and the workpiece is clamped and cut by the first tool and the second tool such that a clearance C [mm] between the first tool and the second tool and a distance d [mm] between the pressing surfaces when the pressing surfaces of the first tool and the pressing surfaces of the second tool come into contact with the workpiece to be cut satisfy the following formula (A). n<C / d<m (A) where n=0.3+(-0.15)x(1-cos4θ) and m=0.4, and θ[°] is the inclination angle of the tool inclined surface with respect to the first direction.

8. The cutting method according to claim 7, wherein at least one of the blade of the first tool or the blade of the second tool has a second vertical wall surface between the pressing surface and the tool inclined surface and perpendicular to the pressing surface, and the workpiece is sandwiched and cut by the first tool and the second tool such that the clearance C [mm] between the first tool and the second tool and the distance d [mm] between the pressing surfaces of the first tool and the pressing surface of the second tool when they contact the workpiece to be cut satisfy the formula (A) where n = 0.3 + (0.0625x - 0.15) x (1 - cos4θ) and m = 0.4, where x [mm] is the length of the second vertical wall surface in the first direction.

9. A composite material having a surface of a base material coated with a coating material, the composite material having a cut end surface along the plate thickness direction from a first surface to a second surface, the cut end surface having, in order, an inclined surface inclined from the first surface in the plate thickness direction, a vertical wall surface along the plate thickness direction continuing from the inclined surface, and a fracture surface connecting the vertical wall surface and the second surface, or having, in order, an inclined surface inclined from the first surface in the plate thickness direction, and a fracture surface connecting the inclined surface and the second surface, at least a portion of the inclined surface is coated with a coating material continuing from the first surface, and at least a portion of the fracture surface is along the second surface.

10. The composite material according to claim 9, wherein the length of the fracture surface in the plate width direction is 30% or less of the plate thickness of the composite material.

11. The composite material of claim 9, wherein said first surface intersects said inclined surface and an interior angle between said first surface and said inclined surface is an obtuse angle.

12. The composite material according to claim 9, wherein the fracture surface comprises a first fracture surface and a second fracture surface, and the first fracture surface and the second fracture surface intersect.

13. The composite material of claim 12, wherein the intersection angle between the first fracture surface and the second fracture surface is less than 90°.

14. The composite material according to claim 9, wherein the coating material is made of Zn, Al or an alloy thereof.

15. The composite material according to any one of claims 9 to 14, wherein the base material is a steel plate.

Images