JP2020032437A - Cut article - Google Patents

Abstract

To provide a cut article which has improved cut end surface corrosion resistance while maintaining flat surface corrosion resistance of multilayer material in the cut article formed by cutting the multilayer material.SOLUTION: In a cut article formed by cutting multilayer material made by covering a surface of base material with covering material, a cut end face of the cut article is composed of a first inclination face which is inclined toward a center from a first surface toward the center in the plate thickness direction, a second inclination face which is inclined toward the center from a second surface in the plate thickness direction and a fracture face formed between the first inclination face and the second inclination face, the first inclination face and the second inclination face are covered with covering material allowing the surface of base material to be covered with at least a part is covered of which at least a part thereof covers the surface of the base material and thicknesses T, Tof the inclination faces when looking at the cut end face satisfy the following relational expression (1); (T+T)<T...(1). Therein, Ais length of the first inclination face, Ais length of the second inclination face, θis inclination angle of the first inclination face, θis inclination angle of the second inclination face and T is plate thickness of the multilayer material.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a cut product formed by cutting a multilayer material obtained by covering a surface of a base material with a coating material.

  Depending on the application, a multi-layered material with the surface of the base material covered with a coating material, such as a plated steel sheet with a plating treatment applied to the surface of the steel sheet, or a coated steel sheet coated on the surface of the steel sheet, is manufactured depending on the application. I have. For example, plated steel sheets having excellent corrosion resistance are used for building materials, automobiles, and home electric appliances.

  A component using a plated steel sheet is manufactured by, for example, cutting a plated steel sheet and then processing it. The cutting of the plated steel sheet 5 can be performed by using, for example, a shearing tool 10 as shown in FIG. The shearing tool 10 includes a die 11, a punch 12, and a blank holder 13. For example, with one end of the plated steel sheet 5 constrained by the die 11 and the blank holder 13, the punch 12 placed with a clearance d from the die 11 is relatively moved to the die 11 side, and sheared to the plated steel sheet 5. Empower. Thereby, the plated steel sheet 5 is cut.

  The plated steel sheet 5 cut using the shearing tool 10 as shown in FIG. 9 has a cut end face as shown in FIG. The cut end face of the plated steel sheet 5 has a sag, a shear surface, and a fracture surface. When the punch 12 shown in FIG. 9 is pushed from the upper surface side of the plated steel sheet 5 to the lower surface side of the plated steel sheet 5 in which the plating 5b is coated on the surface of the base steel sheet 5a, This is the deformation caused by the tensile force acting on the upper surface of the. The sheared surface is a smooth surface formed by the movement of the punch 12 digging into the plated steel sheet 5, and the fractured surface is a surface where the plated steel sheet 5 breaks from a crack generated in the plated steel sheet 5 as a starting point. As shown in FIG. 10, on the cut end surface of the plated steel sheet 5, the plating 5 b remains only on the sag, and the steel sheet 5 a is exposed on the shear surface and the fracture surface.

  Here, the corrosion resistance of the sheared surface and the fracture surface where the steel plate 5a is exposed at the cut end surface of the plated steel plate 5 is low, and there is a concern that red rust may occur. As a countermeasure against rust on a cut end surface of a plated steel sheet, for example, sacrificial corrosion prevention or chemical formation by plating is generally used. For example, in Patent Literature 1, the size of the sag on the cut end surface is set to be in a range of 0.10 times or more of the plate thickness in the plate thickness direction and 0.45 times or more of the plate thickness in the plane direction. It is disclosed that a cutting process is performed. By such a cutting process, the tensile force and the shearing force applied to the steel sheet are increased, and the plated metal layer coated on the surface of the base steel sheet is wrapped around the cut end face, and at least a part of the sheared face of the cut end face is formed by the plated metal layer. Cover. Due to the sacrificial anticorrosion effect of the plated metal layer that has reached the cut end face, the generation of red rust on the cut end face is suppressed.

  Alternatively, Patent Literature 2 discloses a technique in which both upper and lower punches are moved to perform a punching process, thereby increasing a plating residual ratio of an end processed portion of a plated steel sheet and improving corrosion resistance. Further, as a method of cutting a steel slab using upper and lower blades, for example, Patent Document 3 discloses a method of cutting a steel slab by cutting a pair of V-shaped blades into the steel slab.

  Furthermore, Patent Literature 4 discloses a method in which a surface-treated steel sheet is cut with a rotating blade shifted vertically and then subjected to an end face treatment using a forming roll.

JP 2017-87294 A JP 2008-155219 A JP-A-60-62407 JP 2018-075600 A

  However, in Patent Literature 1, the plated metal layer on the surface of the base steel sheet only covers at least a part of the sheared surface among the cut end faces, and the base steel sheet remains exposed in the fractured surface. For this reason, the corrosion resistance of the cut end surface of the plated steel sheet is not sufficient. Generally, if an attempt is made to impart excessive sacrificial corrosion protection to the cut end face for the purpose of rust prevention, the plating on the surface of the plated steel sheet decreases, and the surface corrosion resistance (that is, planar corrosion resistance) of the surface of the plated steel sheet decreases.

  Further, in Patent Document 2, since the diameter of the upper and lower punches is not the same due to the structure of the tool, the plated steel sheet after cutting is not symmetrical, but has a narrowed cutting position. For this reason, there is a concern that water may accumulate in the constriction and the corrosion resistance of the cut end surface may decrease. In addition, the plating layer on the lower surface of the steel sheet extends once downward in a wide range by the upper punch, and then moves following the steel sheet extending upward after being compressed by being sandwiched by the lower punch. . At this time, a tensile force is applied to the plating layer, and there is a concern that the plating layer may be broken or the cut end face may not be sufficiently covered with the plating layer, and the corrosion resistance may not be exhibited.

  Patent Document 3 discloses a technique relating to cutting of a steel slab, particularly a thick slab, etc. There is no specific description regarding cutting of a relatively thin plated steel sheet or the like, and it cannot be easily diverted.

  In Patent Literature 4, the coating rate of plating is increased by performing two processes of cutting a surface-treated steel sheet and forming an end surface of the cut surface-treated steel sheet. However, after cutting the surface-treated steel sheet with the rotating blade shifted up and down, since the shape of the end face is adjusted, stress is applied in different directions in each step as in Patent Document 2 described above. Cracks and peeling are likely to occur. Further, as shown in FIG. 1 of Patent Document 4, the end face of the steel plate as the base material has an arc shape. Therefore, the surface area of the end face of the base material becomes larger than in the case of the end face shape defined by the straight line, and it is necessary to flow more plating layers from the front side to cover the end face. For this reason, there is a possibility that defects such as cracking of the surface layer or local thinning may occur, or poor adhesion of the plating may occur due to the plating flowing into the surface of the steel sheet on which the oxide film or the contamination has adhered. is there.

  Therefore, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a cut processed product formed by cutting a multilayer material, in which the function of the covering material in the plane of the base material is obtained. Another object of the present invention is to provide a new and improved cut product that can exhibit its function on the cut end face while maintaining the above-mentioned properties.

According to an aspect of the present invention, there is provided a cut product formed by cutting a multilayer material obtained by covering a surface of a base material with a coating material. A first inclined surface inclined from the first surface to the center in the plate thickness direction, a second inclined surface inclined from the second surface to the center in the plate thickness direction, And a fracture surface formed between the first inclined surface and the second inclined surface, wherein the first inclined surface and the second inclined surface are at least partially covered by a coating material covering the surface of the base material. A cut processed product is provided, in which the thickness of the coated inclined surface when the cut end face is viewed from the front satisfies the following relational expression (1).
(T ₁ + T ₂ ) <T (1)
T ₁ = A ₁ cos θ ₁ , T ₂ = A ₂ cos θ ₂
Here, T ₁ is the thickness of the first inclined surface when the cut end surface is viewed from the front, T ₂ is the thickness of the second inclined surface when the cut end surface is viewed from the front, and A ₁ is the cut end surface Is the length of the first inclined surface when viewed from the side, A ₂ is the length of the second inclined surface when the cut end surface is viewed from the side, θ ₁ is the inclination angle of the first inclined surface, θ ₂ is the inclination angle of the second inclined surface, and T is the thickness of the multilayer material.

  When the cut end surface is viewed from the side, the first inclined surface and the second inclined surface may be linear.

The thickness of the first inclined surface T ₁ and the ratio of the thickness T ₂ of the second inclined surface may satisfy the following equation (2).
0.6 ≦ (T ₁ / T ₂ ) ≦ 1.4 (2)

The thickness T ₃ of the fracture surface when viewed cut edge from the front, may satisfy the following equation (3).
0 <T ₃ ≦ 0.5T (3)

  The first inclined surface is at least partially covered by a covering material covering a first surface of the base material, and the second inclined surface is covered by a covering material at least partially covered by a second surface of the base material. Have been.

  In addition, the amount of the covering material that covers the first inclined surface and the second inclined surface decreases from the surface toward the center in the thickness direction.

  Regarding the first inclined surface and the second inclined surface, the covering ratio of the covering material represented by a ratio of the length of the portion where the covering material exists to the length of the inclined surface when the cut end surface is viewed from the side surface Is preferably at least 20%.

Further, cutting the workpiece, in more than 60% of the range of the plate width of the multi-layer material, the thickness of the first inclined surface T ₁ and the value of the sum and the ratio of the thickness T ₂ of the second inclined surface The variation is 30% or less, and the variation in the coverage of the coating material, which is represented by the ratio of the length of the portion where the coating material exists to the length of the inclined surface when the cut end face is viewed from the side surface, is 30%. It may be formed as follows.

  The thickness t of the base material may be 0.2 mm or more and 10 mm or less.

  As the coating material, a material made of Zn, Al, or an alloy thereof may be used.

  The base material may be a steel plate.

  The multilayer material may be a plated steel sheet.

  As described above, according to the present invention, in a cut product formed by cutting a multilayer material, the function of the covering material in the plane of the base material is maintained, and the function is also exerted on the cut end surface. Can be.

It is explanatory drawing which shows typically the cut end surface of the cut processed product which concerns on one Embodiment of this invention. It is explanatory drawing for demonstrating the shape of the cut processed product which concerns on the embodiment. It is explanatory drawing which shows the other example of the shape of the cut processed product which concerns on the embodiment. It is explanatory drawing which shows an example of the cutting and cutting processing tool which concerns on the embodiment, and shows the state before cutting of a plated steel plate. FIG. 5 is an explanatory view showing a state after cutting a plated steel sheet by the cutting tool shown in FIG. 4. FIG. 4 is an explanatory diagram showing a cut product of a clad material as an example of the cut product according to the embodiment. It is the front photograph and the side cross section photograph of the cut end surface of a cut processed product. It is explanatory drawing which shows the state of the cut end surface after a 50-day exposure test of the cut end surface after the cutting process of a cut processed product. It is explanatory drawing which shows an example of the conventional shearing tool. It is explanatory drawing which shows typically the cutting | disconnection end surface of the multilayer material cut | disconnected by the shearing tool of FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the specification and the drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

<1. Cutting products>
[1-1. Schematic configuration]
First, a configuration of a cut product 3 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is an explanatory view schematically showing a cut end face 3a of a cut product 3 according to the present embodiment, and shows a state where the cut end face 3a is viewed from a side surface. In the following description, as an example of the multilayer material, a plated steel sheet 5 in which a plating 5b as a coating material is coated on a surface of a steel sheet 5a as a base material will be described. The plated steel sheet 5 is, for example, a plated steel sheet specified in JIS G-3301, 3302, 3314, 3321, 3323, or the like. The plate length direction of the plated steel sheet 5 is defined as an X direction, the plate width direction is defined as a Y direction, and the thickness direction is defined as a Z direction. FIG. 1 shows a cut product 3 formed by cutting a plated steel plate 5 in a plate thickness direction (Z direction), and shows a state in which a cut end surface 3a is viewed from a plate width direction (Y direction).

  As shown in FIG. 1, the cut end surface 3a of the cut product 3 includes a first inclined surface s1, a second inclined surface s2, and a fractured surface s5.

  The first inclined surface s1 includes a sag s11 and an inclined portion s13. The second inclined surface s2 includes a sag s21 and an inclined portion s23. The sagging s11 and S21 are deformations caused by the tensile force acting on the surface of the plated steel sheet 5 when the plated steel sheet 5 is cut. The inclined portions s13 and s23 are surfaces continuous with the sagging s11 and s21, and are surfaces having a predetermined inclination angle with respect to the thickness direction of the plated steel sheet 5. At least a part of the first inclined surface s1 and the second inclined surface s2 is covered with a plating 5b that covers the surface of the steel plate 5a.

  The fracture surface s5 is a surface formed between the first inclined surface s1 and the second inclined surface s2. The fractured surface s5 is formed by breaking the plated steel sheet 5 starting from a crack generated in the plated steel sheet 5 during cutting. Therefore, the cut surface s5 is hardly covered with the plating 5b, and the steel plate 5a is exposed.

  As shown in FIG. 1, such a cut end surface 3a has a shape in which the fracture surface s5 projects more than the first inclined surface s1 and the second inclined surface s2 when viewed from the side. The shape of the steel plate 5a, which is the base material of the first inclined surface s1 and the second inclined surface s2, is substantially straight when the cut end surface 3a is viewed from the side. Hereinafter, the configuration of the cut product 3 according to the present embodiment will be described in detail with reference to FIGS. FIG. 2 is an explanatory diagram for explaining the shape of the cut product 3 according to the present embodiment. FIG. 3 is an explanatory diagram showing another example of the shape of the cut product 3 according to the present embodiment.

[1-2. Characteristic]
(Length of inclined surface and ratio of length of both inclined surfaces)
The cut product 3 has a cut end surface 3a including a first inclined surface s1, a second inclined surface s2, and a fracture surface s5. Here, the cut processed product 3 has the first inclined surface s1 and the second inclined surface s2 of the cut end surface 3a, and the thickness of each inclined surface s1, s2 when the cut end surface 3a is viewed from the front (X direction). Satisfy the following relational expression (1). In relation (1), the cut end face 3a of the cut workpiece 3 according to the present embodiment, the thickness T ₁ of the first inclined surface s1 when viewed cut edge 3a from the front _(i.e., in the thickness direction The length (A ₁ cos θ ₁ ) of the first inclined surface s1) and the thickness T ₂ of the second inclined surface s2 when the cut end surface 3a is viewed from the front (that is, the second inclination in the plate thickness direction). The sum with the length of the surface s2 (A ₂ cos θ ₂ )) is smaller than the thickness T of the plated steel sheet 5.

(T ₁ + T ₂ ) <T (1)
T ₁ = A ₁ cos θ ₁ , T ₂ = A ₂ cos θ ₂
A ₁ : length of the first inclined surface s1 when the cut end surface 3a is viewed from the side surface A ₂ : length of the second inclined surface s2 when the cut end surface 3a is viewed from the side surface θ ₁ : first The inclination angle of the inclined surface s1 θ ₂ : The inclination angle of the second inclined surface s2 T: The thickness of the plated steel sheet 5

Further, cutting the workpiece 3, a first ratio of the thickness _{T 2} of the thickness _{T 1} and the second inclined surface s2 of the inclined surface s1 _(T 1 / T ₂₎ is the following relationship of the cutting edge 3a ( 2) is satisfied. In the relational expression (2), the thickness (T ₁ = A ₁ cos θ ₁ ) of the _first inclined surface s1 and the thickness of the second inclined surface s2 of the cut end surface 3a of the cut product 3 according to the present embodiment. It shows that the ratio of (T ₂ = A ₂ cos θ ₂ ) is 0.6 or more and 1.4 or less. This means that the shape difference between the first inclined surface s1 and the second inclined surface s2 is small, that is, the symmetry of the cut end surface 3a is high. The ratio of the thickness _{T 1} of the first inclined surface s1 and thickness _{T 2} of the second inclined surface s2 _(T 1 / T ₂₎ is preferably 0.75 to 1.25, more desirably 0 0.85 or more and 1.15 or less.

0.6 ≦ (T ₁ / T ₂ ) ≦ 1.4 (2)

  By having this relational expression, a multilayer material having high symmetry of the cut end face 3a can be obtained. For example, at least a part of the cut end face 3a is covered with a covering material that covers the surface of the base material that moves following the blade when cutting the multilayer material. At this time, when the thicknesses of the coating materials covering both surfaces of the base material are substantially the same, the higher the symmetry of the cut end face 3a, the more the cut end face 3a becomes the first slope s1 and the second slope s2. The thickness of the covering material covering each becomes the same. As a result, the corrosion resistance of the cut end surface 3a can be stabilized.

Here, the length A ₁ of the first inclined surface s1, as shown in FIG. 2, the ends of the surface side of the plated steel sheet 5 sagging s11 (hereinafter to. As "inclination start position P _1") It refers to the linear length of the inclined portion s13 up to the end on the fracture surface s5 side (hereinafter referred to as “inclination end position P ₂ ”). The length A2 of the _second inclined surface s2 is from the end of the sag s21 on the surface side of the plated steel plate 5 (hereinafter referred to as “inclination start position P ₃ ”) to the end of the inclined portion s23 on the fracture surface s5 side. (Hereinafter referred to as “inclination end position P ₄ ”).

Further, depending on the shape of the cutting tool 100, the cut end face 3a of the cut product 3 has a shape such that the fractured surface s5 is torn, for example, as shown in FIG. Also in this case, the first sloping surface s1 and the second sloping surface s2 each include a sag and an inclined portion. One inclined surface (the first inclined surface s1 in FIG. 3) has substantially the same inclination as the fracture surface s5, and the other inclined surface (the second inclined surface s2 in FIG. 3) moves toward the fracture surface s5. It has a shape that warps after tilting. In this case, the thickness T ₂ of the thickness T ₁ and the second inclined surface s2 of the first inclined surface s1 can be defined as follows.

Inclination start position P ₃ of the inclined starting position P ₁ and the second inclined surface s2 of the first inclined surface s1, similar to FIG. 2, an end portion of the front surface of the plated steel sheet 5 sagging. The length A ₁ of the first inclined surface s1 from the inclined starting position P ₁ of the inclined surface s1, a straight length of an end portion of the fracture surface s5 side of the inclined surface s1 to the inclined end position P _2. Length A ₂ of the second inclined surface s2 from the inclined starting position P ₃ of the inclined surface s2, a linear length of the inclined end position P ₄ is an end of the fracture surface s5 side of the inclined surface s2. At this time, when the inclined surfaces s1 and s2 are depressed and curved toward the steel plate 5a, the length may be obtained by linear approximation. Further, the inclined surface s2 that warped as shown in FIG. 3, linearly approximated gradient between the end portion P ₅ and the inclined starting position P ₃ of the fracture surface s5 side portion where the plating 5b exists, the approximate line If the intersection point P ₆ with an extension in the horizontal direction through the tilt end position P _4, which is also the apex of the warping regarded as inclined end position P _4, may be as part of the length a ₂ of the second inclined surface s2 . The thickness T ₃ of the fracture surface s5 is a distance between the inclined end position P ₂ and the inclined end position P _4.

The inclination angle θ1 of the _first inclined surface s1 is the inclination of the inclined portion s13 with respect to a reference straight line extending in the thickness direction (Z direction), as shown in FIGS. The angle between the straight line and the reference straight line connecting the tilting start position P ₁ and the inclined end position P ₂ may be regarded as the inclination angle theta _1. Similarly, the inclination angle θ2 of the _second inclined surface s2 is the inclination of the inclined portion s23 with respect to the reference straight line. The angle between the straight line and the reference straight line connecting the tilting start position P ₃ and the inclined end position P ₄ may be regarded as the inclination angle theta _2.

As shown in FIGS. 2 and 3, the thickness T of the plated steel sheet 5 is the sum of the thickness t of the steel sheet 5a and the plating layer thicknesses t _a and t _b of the plating 5b formed on the surface of the steel sheet 5a. expressed. Note that, in FIGS. 1 to 3, and the plating layer thickness t _b and the plating layer thickness t _a, it is substantially the same, the present technology is not limited to this example, the plating layer thickness t _a plating layer thickness t _b The thickness may be different from.

Moreover, cutting the workpiece 3, the thickness T ₃ of the fracture surface s5 when viewed cut edge 3a from the front satisfies the following equation (3). The relational expression (3) indicates that the cut end face 3a of the cut product 3 according to the present embodiment has a fracture surface s5, which is a ductile fracture surface in the final stage of cutting, having a length of 50% or less of the plate thickness. Represents. Incidentally, the thickness _{T 3} are 0 fracture surface s5 is cut end face 3a is meant that consists of only the inclined surfaces s1, s2. Since the fractured surface s5 exists even in a state close to almost zero in the actual cut product, the thickness T3 of the fracture surface s5 of the cut product ₃ is assumed to be larger than zero. The thickness _{T 3} of the fracture surface s5 is preferably 0.4, more preferably 0.3 or less.

0 <T ₃ ≦ 0.5T (3)

  By having this relational expression, the inclined surfaces s1 and s2 (that is, the sag portions s11 and s21 and the inclined portions s13 and s23) increase, and as a result, the plating coverage is improved. That is, when sacrificial corrosion protection is performed on the base material, an effect of improving the corrosion resistance of the cut end surface is exhibited. This shape can be obtained by adjusting the shape or position of the cutting edge of the cutting tool.

(Plating coating on inclined surface)
At least a part of the first inclined surface s1 and the second inclined surface s2 is covered by plating. More specifically, as shown in FIG. 1, the first inclined surface s1 is covered with a plating 5b that covers the lower surface (first surface) of the steel plate 5a. The second inclined surface s2 is covered with a plating 5b that covers the upper surface (second surface) of the steel plate 5a. As described above, the first inclined surface s1 and the second inclined surface s2 are covered with the plating 5b continuous from the plating layer of the plated steel sheet 5, respectively. Thus, by covering with the same plating 5b from the surface of the steel plate 5a to the inclined surface, the oxidation of the steel plate 5a on the cut end surface 3a can be suppressed.

  For example, after cutting the plated steel sheet 5, it is possible to prevent the steel sheet 5a from being exposed at the cut end face 3a by plating or painting the cut end face 3a. However, it is difficult to cover the cut end face 3a with a material having the same composition as the plating 5b of the plated steel sheet 5, and the corrosion resistance of the cut end face 3a is lower than the surface of the steel sheet 5a. On the other hand, the cut end face 3a of the cut product 3 according to the present embodiment is covered with the same continuous plating 5b from the surface of the steel plate 5a to the inclined surfaces s1 and s2. The plating 5b moves from the surface of the steel plate 5a toward the inclined surfaces s1 and s2 while being pressed against the steel plate 5a following the movement of the blade portion of the cutting tool during the cutting process. For this reason, the adhesion force between the steel plate 5a and the plating 5b on the cut end face 3a becomes higher than when the surface treatment is performed on the cut end face 3a later, and the corrosion resistance of the cut end face 3a can be increased.

  Further, the amount of the plating 5b that covers the first inclined surface s1 and the second inclined surface s2 decreases from the surface of the steel plate 5a toward the center in the thickness direction (Z direction). That is, as shown in FIGS. 1 and 2, the first inclined surface s1 and the second inclined surface s2 have a greater width in the plate width direction than the plating layer thickness of the plating 5b covering the surface of the steel plate 5a. The thickness of the plating layer gradually decreases toward the center. The plating 5b covering the first inclined surface s1 and the second inclined surface s2 is obtained by moving the plating 5b of the plating layer forming the plated steel sheet 5. Therefore, when the plating layer thickness of the plating 5b on the first inclined surface s1 and the first inclined surface s2 is increased, the corrosion resistance of the cut end surface 3a is improved, but the plating layer thickness of the plating 5b on the surface of the steel plate 5a is small. Therefore, there is a possibility that the planar corrosion resistance is reduced. Therefore, the plating 5b is coated on the first inclined surface s1 and the second inclined surface s2 such that the amount of the plating 5b covering the inclined surface decreases from the surface of the steel plate 5a toward the center. The corrosion resistance of the cut end face 3a can be enhanced while maintaining the planar corrosion resistance of the cut product 3.

  Here, the shape of the steel plate 5a as a base material of the first inclined surface s1 and the second inclined surface s2 is substantially linear when the cut end surface 3a is viewed from the side as shown in FIGS. You may make it become. If the shape of the cut end surface 3a of the steel plate 5a is an arc shape when viewed from the side, the steel plate 5a of the first inclined surface s1 and the second inclined surface s2 is substantially linear as shown in FIGS. The surface area of the end face of the steel plate 5a is larger than the case of Then, in order to cover the cut end face 3a, it is necessary to flow more plating 5b of the plating layer from the front side to the cut end face 3a. Therefore, as shown in FIGS. 1 to 3, the shape of the steel plate 5a, which is the base material of the first inclined surface s1 and the second inclined surface s2, is substantially linear when the cut end surface 3a is viewed from the side. By doing so, it is possible to suppress the occurrence of problems such as cracking of the plating on the surface layer or local thinning.

  Further, the first inclined surface s1 and the second inclined surface s2 do not necessarily have to be entirely covered with the plating 5b, but may be at least partially covered with the plating 5b. If a part of the inclined surfaces s1 and s2 is covered, the progress of corrosion is suppressed by the sacrificial anticorrosion effect even in the part not covered by the plating 5b. In order to provide a sacrificial corrosion protection effect to the inclined surfaces s1, s2 and the fracture surface s5, the plating coverage X of the inclined surfaces s1, s2 is preferably 20% or more.

Here, the plating coverage X is such that the plating 5b is equal to the lengths A ₁ and A ₂ of the inclined surfaces s1 and s2 when the cut end surface 3a is viewed from the side surface (that is, the plate width direction (Y direction)). It is a ratio of the lengths B ₁ and B ₂ of the existing portions, and is represented by the following equation (4). In Formula (4), A is the sum of the length _{A 1} of the first inclined surface s1 and the length _{A 2} of the second inclined surface s2 _(i.e., A 1 + _{A 2).} Of B, the sum of the length _{B 2} of the portion where the plating 5b is present in the first inclined surface length of the portion where the plating 5b is present in s1 _{B 1} and the second inclined surface s2 _(i.e., B 1 + _{B 2} ).

X = 100 × (B / A) (4)
A (= A ₁ + A ₂ ): Length of inclined surface B (= B ₁ + B ₂ ): Length of portion where plating exists

The length B ₁ , B ₂ of the portion where the plating 5b exists is such that the plating layer thickness of the plating 5b on the inclined surfaces s1, s2 from the inclination start positions P ₁ , P ₃ is the plating layer of the plated steel sheet 5 before cutting. the thickness _t a, the length to the position 5 after% of _{t b.} This is because when considering the long-term use of a material that has been plated for corrosion resistance, the cut end face 3a needs to have the same level of corrosion resistance as the surface of the plated steel sheet 5. Considering the wraparound of the plating component that has melted from the plated steel sheet 5 to the cut end face, it is considered that if about 5% of the plating remains on the cut end face 3a, it will be expressed as initial corrosion resistance. The coefficient for specifying the position where the plating 5b remains may be set according to the thickness t of the steel plate 5a. If the plate thickness t of the steel plate 5a is small, the coefficient may be small. The thickness t of the steel plate 5a may be any thickness as long as the cut product 3 can be manufactured, and may be, for example, 0.2 mm or more and 10 mm or less.

Also, when the cut workpiece 3 has a cutting end face 3a, as shown in FIG. 3, the inclined surface s2 that warped is substantially exist once plating 5b in sagging side of the inclined end position P _4, which is also the apex of the warp Although no longer, sometimes plating remaining on the tip of the tool is attached to the vicinity of the inclined end position P _4. For attachment of the tilt end position P ₄ near the plating is uncertain, the inclined end position P ₄ near plating layer thickness t _a of the plating layer thickness is cut before the plated steel sheet _5, or about 5% of the t _b even it was, may be not considered as the length B ₂ of the portion where the plating 5b exists.

  As described above, according to the present embodiment, by setting the shape of the cut end face of the plated steel sheet 5 as described above, the cut end face corrosion resistance while maintaining the plane corrosion resistance of the plated steel sheet 5 by the plating 5b which is a multilayer material. Can be improved.

(How to observe the cut end face)
The shape of the cut product 3 can be specified by observing the cut end face 3a.

The thickness T ₂ of the thickness T ₁ and the second inclined surface s2 of the first inclined surface s1 when viewed cut edge 3a from the front, created a cut workpiece 3 by polishing embedded in a resin or the like It is measured by observing the sample from the side. That is, the sample is observed from the Y direction (board width direction) as shown in FIG. The observation is performed using, for example, a stereoscopic microscope or a scanning electron microscope (SEM). Specifically, for example, the sample may be equally divided in the width direction by the number of measurements, and each section may be measured. The measurement is preferably performed in at least three places. Then, the thickness of the average of the first inclined surface s1 in each cross section and a thickness T ₁ of the first inclined surface s1, the second inclined surface s2 in each cross-sectional thickness average value of the second of it may be the thickness _{T 2} of the inclined surface s2.

  When observing the covering rate of the covering material on the cut end surface, depending on the type of the covering material, only a smaller covering material than the actual covering rate may be observed. For this reason, for example, it is desirable to embed and polish in a resin or the like while the peripheral portion of the coating material is reinforced with a backing plate when preparing a sample. Also, it is desirable to use a polishing method according to the type or hardness of the coating material.

  As another method of observing the cut end face 3a of the cut processed product 3 other than the method of observing a sample formed by embedding the cut processed product 3 in a resin or the like, for example, the stereoscopic microscope or the SEM-EDS (Energy Dispersive X-ray Spectroscopy). When the covering material can be confirmed by color or gloss, the covering material on the cut end face 3a may be confirmed using a stereo microscope. On the other hand, when it is difficult to confirm the coating material based on color or gloss, the presence of the coating material may be confirmed using a reflection electron image (BSE image) of SEM or EDS.

From these methods, it is possible to presume to what extent the coating material actually exists on the cut end face 3a, so that it is possible to confirm whether polishing is being performed as intended. If the polishing of the sample is difficult, the cut product 3 is observed from the front (that is, from the X direction), and the length of the portion where the coating material is present on the cut end surface 3a is measured. the thickness T ₂ of the thickness T ₁ and the second inclined surface s2 of the inclined surface s1 may be identified. At this time, the length of the portion where the coating material exists at a plurality of positions in the plate width direction of the cut end surface 3a may be measured, and the average length thereof may be used as the thickness of the inclined surface.

Incidentally, the cutting workpiece 3 according to the present embodiment, in more than 60% of the range of the plate width of the multi-layer material, the thickness of the thickness of the first inclined surface s1 T ₁ and the second inclined surface s2 T ₂ If the variation of the sum and the ratio is not more than 30%, it is possible to improve the cut end face corrosion resistance while maintaining the plane corrosion resistance of the multilayer material of the cut end face 3a. At this time, in the range of 60% or more of the plate width of the multilayer material, the variation in the coverage of the coating material when the cut end face 3a is viewed from the side surface may be 30% or less. Regarding the variation of the coverage, the portion covered with the coating material is measured at a plurality of locations in the plate width direction using a stereoscopic microscope or SEM-EDS, and the average value is calculated as in the measurement of the coverage. Then, the variation may be calculated.

<3. Cutting process>
The cut product 3 according to the present embodiment can be manufactured by, for example, the cutting tool 100 shown in FIGS. 4 and 5. FIG. 4 is an explanatory diagram illustrating an example of the cutting tool 100 according to the present embodiment, and illustrates a state before cutting the plated steel sheet 5. FIG. 5 is an explanatory view showing a state after cutting the plated steel sheet 5 by the cutting tool 100 shown in FIG.

  As illustrated in FIG. 4, the cutting tool 100 according to the present embodiment includes a die 110 having a wedge-shaped first blade 113 on a base 111 and a base 121 with a wedge-shaped first blade 113 as viewed from the plate width direction (Y direction). And a punch 120 having a wedge-shaped second blade 123. The wedge-shaped first blade portion 113 and the second blade portion 123 extend in the plate width direction (Y direction), and are plated steel plates along the direction in which the first blade portion 113 and the second blade portion 123 extend. 5 is cut.

  The plated steel plate 5 cut by the first blade portion 113 of the die 110 and the second blade portion 123 of the punch 120 has both ends thereof held by blank holders (not shown) and the die 110 and the punch. 120. At this time, the die 110 and the punch 120 are installed with the first blade 113 and the second blade 123 facing each other. Then, by pressing the punch 120 relative to the die 110, the plated steel sheet 5 is cut as shown in FIG.

  The cutting tool 100 according to the present embodiment is configured such that when the punch 120 is pushed into the die 110, the tensile force generated between the first blade portion 113 and the second blade portion 123 and the plated steel plate 5 causes the plated steel plate 5 Is cut into the cut end face 3a so that the cut end face 3a is covered with the plating 5b as shown in FIGS. That is, the plating 5b on the surface of the plated steel sheet 5 follows the movement of the first blade portion 113 and the second blade portion 123 with respect to the plated steel sheet 5 when the punch 120 is pushed into the die 110, and the plated 5b is cut into the cut end surface 3a. Let go. Thereby, the cut end face 3a of the cut product 3 manufactured by cutting the plated steel sheet 5 can be covered with the plating 5b.

  The shape of the cut end face 3a of the plated steel sheet 5 cut by the cutting tool 100 according to the present embodiment is caused by the shapes of the first blade portion 113 and the second blade portion 123. Since the first blade portion 113 and the second blade portion 123 are wedge-shaped, the cut end surface 3a of the plated steel sheet 5 is not a vertical shear surface as shown in FIG. The shape has inclined surfaces s1 and s2 along the wedge-shaped inclined surface as shown. As a result, the cut end surface 3a of the cut product 3 manufactured by the cutting process has a shape protruding toward the center in the plate thickness direction.

  Also, by making the shape of the first blade portion 113 and the second blade portion 123 into a wedge shape as in the cutting tool 100 shown in FIGS. The plating 5b on the surface of the steel plate 5a along the slope easily follows the movement of the first blade portion 113 and the second blade portion 123. As a result, as shown in FIG. 1 and the like, the plating 5b on the surface of the steel plate 5a can follow not only the sags s11 and s21 of the cut end face 3a but also the inclined portions s13 and s23.

  Furthermore, by forming the first blade 113 of the die 110 and the second blade 123 of the punch 120 in a wedge shape as in the cutting tool 100 according to the present embodiment, for example, the tensile strength is 100 MPa or more. A material having strength or a material having a thickness can also be cut.

<4. Multi-layer material>
In the above description, the multilayer material is a plated steel sheet, but the present invention is not limited to such an example. The covering material may be formed by covering the surface of the base material with the covering material. For example, a metal material such as a steel plate may be used as a base material, and a material made of Zn, Al or an alloy thereof, an oxide film, a coating material, a resin material, or the like may be used as the coating material. In addition, the multilayer material may be a coated steel sheet in which the surface is coated on a base metal material, or a film-laminated steel sheet in which a film is laminated on a steel sheet. Alternatively, as shown in FIG. 6, the cut product 3 can be manufactured from a clad material 7 composed of a base material 7a and a coating material 7b. Examples of the clad material 7 include a Ni clad copper material using a Cu plate as a base material 7a and a Ni plate as a coating material 7b.

  Further, the coating material constituting the multilayer material is not limited to only one layer, and may be a plurality of layers. For example, the surface of the above-described plated steel sheet may be subjected to a treatment such as a chemical conversion treatment, painting, lamination, or the like. In this case, the above-mentioned relational expressions (1) to (3) may be considered with respect to the coating material coated immediately above the base material.

  Although the purpose is to improve the corrosion resistance of the cut end surface while maintaining the plane corrosion resistance of the multilayer material, a metal material such as Cu, Cr, Ag, Au, or Pt is used as a base material of a resin material such as plastic. A cut product of the multilayer material used as the covering material can be formed in the same manner.

  When a resin material such as plastic coated with metal is cut, the electrical conductivity of the end face is lost. In addition, when the ratio of exposing the resin is high, the resin is easily charged, and there is a concern that sparks may occur. Therefore, by setting the cut end face of such a resin material to have the same shape as the cut end face of the multilayer material according to the present embodiment, it is possible to improve the electrical conductivity of the cut end face and prevent charging. Become.

  Further, in the case of a clad material, the purpose required when the material is cut is different depending on the combination with the coating material and the application. However, by adopting the same shape as the cut end surface of the multilayer material according to the present embodiment, the corrosion resistance and chemical resistance of the base material of the cut end surface can be improved. Further, the electrical conductivity, thermal conductivity, magnetism, etc. of a part or the whole of the cut end face can be improved as compared with the conventional cutting method.

  In the case of a coating film or a laminate, the cut end face is formed in the same shape as the cut end face of the multilayer material according to the present embodiment, so that not only the corrosion resistance of the base material, but also the suppression of swelling under the coating film-film, The appearance can be improved by not exposing the material, and the insulation of a part or the whole of the cut end surface can be improved.

  As described above, by setting the shape of the cut end face of the multilayer material to the shape of the cut end face according to the present embodiment, the function of the covering material in a plane can also be provided to the cut end face. In addition, the function which a coating material has is not limited to the above-mentioned example, The function can be exhibited according to the use of a coating material.

(Example 1)
FIG. 7 shows a front photograph and a side cross-sectional photograph of the cut end face of the plated steel sheet cut by the working tool. As a comparative example, a front photograph and a side cross-sectional photograph of a cut end surface of a plated steel sheet when the plated steel sheet is cut using the conventional shearing tool 10 shown in FIG. 9 are shown. Further, as an example, a front photograph and a side cross-sectional photograph of a cut end surface of a plated steel sheet when the plated steel sheet is cut using the cutting tool 100 shown in FIG. 4 are shown. In the examples, the case where the tip radius R ₁ of the cutting edge of the die and the tip radius R ₂ of the cutting edge of the punch were set to 0.05 mm (Example 1) and 0.5 mm (Example 2) were examined.

  As shown in FIG. 7, in the comparative example, the cut end surface was formed with a sag, a shear surface, and a fracture surface, and the ratio of the fracture surface was large. Plating was abundant on the sagging, but was scarcely present on the sheared and fractured surfaces. The shear surface is formed when the cutting edge of the tool enters the steel plate and plating, and the fracture surface is formed by the development of a ductile fracture. For this reason, when the conventional shearing tool was used, the plating could not follow the shear surface and the fracture surface, and it is considered that the plating hardly existed.

  On the other hand, in Examples 1 and 2, the cut end faces were formed with sagging, inclined surfaces, and broken surfaces, and the ratio of the inclined surfaces was large. Plating remained on the inclined surface, and the amount of plating covering the inclined surface decreased from the steel sheet surface toward the center of the sheet thickness.

  FIG. 8 shows the state of the cut end surface when a 50-day exposure test was performed on the sheared product of the comparative example of FIG. 7 and the cut processed products of Examples 1 and 2. The plating coverage was calculated based on the above equation (4). In the 50-day exposure test, these processed products were left along the coast near the factory for 50 days, and the condition of the cut end face was examined thereafter. The appearance of each cut end face is shown on the left side of FIG. 8, and the state where each cut end face is embedded in resin and observed is shown on the right side of FIG.

  As shown in FIG. 8, in the sheared product of the comparative example, the plating coverage on the inclined surface of the cut end surface was about 10%. After a 50-day exposure test was performed on the sheared product of the comparative example, the occurrence rate of red rust on the cut end face was examined. As a result, red rust was generated on about 95% of the cut end face. The cut end face had red rust generated and flow, resulting in poor appearance. On the other hand, in the cut products of Examples 1 and 2, the plating coverage on the inclined surface of the cut end surface was about 50 to 80%. After performing a 50-day exposure test on the cut products of Examples 1 and 2, the occurrence of red rust on the cut end surface was examined. As a result, the occurrence of red rust was suppressed at about 30% of the cut end surface. In addition, the appearance of the cut end face was also good.

(Example 2)
(1) Verification of multilayer materials other than plated steel sheet For the four multilayer materials shown in Table 1 below, the shapes of processed products based on the above-mentioned relational expressions (1) to (3) and the performance required for each multilayer material The relationship was investigated.

  In Example A1 and Comparative Example A1, a multilayer material in which SUS was coated as a coating material on the surface of Al as a base material was processed to produce a processed product. In Example A2 and Comparative Example A2, a multilayer product in which Ni was coated as a coating material on the surface of Cu as a base material was processed to produce a processed product. In Example A3 and Comparative Example A3, a multilayer material in which the surface of an ABS resin as a base material was coated with Cu as a coating material was processed to manufacture a processed product. In Example A4 and Comparative Example A4, a multilayer material in which the surface of an ABS resin as a base material was coated with Cr as a coating material was processed to produce a processed product.

  For Examples A1 to A4, the multilayer material was processed by the above-described cutting method according to the present embodiment, and cut products satisfying the above relational expressions (1) to (3) were manufactured. On the other hand, for Comparative Examples A1 to A4, the multilayer material was processed by the conventional shearing method shown in FIG. 9 to produce a sheared product. Therefore, the sheared products of Comparative Examples A1 to A4 had end face shapes as shown in FIG. 10 and did not satisfy the above relational expressions (1) to (3).

  Table 1 shows the evaluation results for the sheared product and the cut product. The evaluation of the sheared product and the cut product was performed as follows because the required functions differ depending on the combination of the covering material and the base material.

In Examples A1 and A2 and Comparative Examples A1 and A2, in order to verify the corrosion resistance and chemical resistance of the base material of the cut end face, the sheared product and the cut product were used in an organic solvent system used for a lithium ion secondary battery. After being immersed in the electrolytic solution for 60 minutes, it was taken out, and its appearance was judged based on the following criteria, and the presence or absence of erosion was examined.
（(No erosion): 60% or less of the area where the appearance change occurs on the cut end surface x (with erosion): more than 60% of the area where the appearance change occurs on the cut end surface

In Examples A3 and A4 and Comparative Examples A3 and A4, in order to verify the electrical conductivity of the cut end face, the presence or absence of electricity between the cut end face and the surface of the coating material was examined based on the following criteria.
○ (Electrified): The energized area is 20% or more of the cut end face × (No energized): The energized area is less than 20% of the cut end face

  From Table 1, as a result of satisfying the above-mentioned relational expression (1), the cut products of Examples A1 to A4 were able to exhibit the functions required for each. Furthermore, since the cut products of Examples A1 to A4 satisfy the above-mentioned relational expressions (2) and (3), it is inferred that the functions required for each of them were more significantly expressed. On the other hand, since the sheared products of Comparative Examples A1 to A4 do not satisfy the above-mentioned relational expressions (1) and further do not satisfy the relational expressions (2) and (3), the required functions can be exhibited. Not the result.

  It should be noted that the multilayer material verified in the present embodiment is an example, and it goes without saying that similar results can be obtained with other multilayer materials. For example, a multi-layered material in which the surface of a base material as a metal material is coated with a coating material such as Al, Cu, Ti, Sn, or SUS, or a surface of a base material as a resin material such as a vinyl chloride resin or an ABS resin. The same results as described above can be obtained for the coated covering material.

(2) Verification of Plated Steel Sheet Next, for the coating materials A to H and the steel sheet I, which are the plated steel sheets shown in Table 2 below, the shapes of the processed products based on the above relational expressions (1) to (3) and the 50-day exposure test The relationship with the results of the above was examined. Table 3 shows the results. The corrosion resistance was evaluated based on the state of the evaluation surface after the sample was placed in a sunny environment on the beach with the cut end surface (evaluation surface) facing upward and exposed for 50 days. The state of the evaluation surface was classified as follows based on the ratio of the area where red rust occurred to the entire area of the evaluation surface (red rust occurrence area ratio).
◎ (Excellent): Area ratio of red rust occurrence less than 30% ○ (Good): Area ratio of red rust occurrence of 30% or more and less than 60% △ (Acceptable): Area ratio of red rust occurrence of 60% or more and less than 80% × (Not possible): Area of red rust occurrence 80% or more

  From Table 3, Examples B1 to B36 satisfy the relationship of the above formula (1), and as a result, the area ratio of red rust occurrence on the evaluation surface after the 50-day exposure test was less than 80%. In addition, about Example B11 and B12, the board | substrate thickness is thin compared with the cut processed product of other Examples. For this reason, if the plated steel sheet is not firmly suppressed at the time of cutting, the timing at which the blade portion hits is shifted, and distortion is likely to occur. However, the area ratio of red rust occurrence on the evaluation surface after the 50-day exposure test was less than 80%. Further, as shown in Examples B21 to B24, even if the shapes of the lower blade (the first blade portion 113 in FIG. 5) and the upper blade (the second blade portion 123 in FIG. 5) are different, cutting is performed. When the shape of the cut end face of the processed product satisfies the relationship of the above formula (1), the area ratio of red rust occurrence on the evaluation surface after the 50-day exposure test was all less than 80%. Further, since the cut products of Examples B1 to B36 satisfy the above-mentioned relational expressions (2) and (3), it is presumed that stable corrosion resistance of the cut end surface was exhibited.

  On the other hand, since Comparative Examples B1 to B11 and B14 to B18 do not satisfy the relations of the above formulas (1) to (3), the area ratio of red rust occurrence on the evaluation surface after the 50-day exposure test is 80% or more. Was. For Comparative Examples B12 and B13, a sheared product was evaluated based on the method of Patent Document 2 when shearing was performed. Also in this case, since the relationship of the above formulas (1) and (2) was not satisfied, the area ratio of red rust occurrence on the evaluation surface after the 50-day exposure test was 80% or more. Comparative Examples B20 and B21 are sheared products of a cold-rolled steel sheet having no plating layer, and have the same shape of the cut end surface as in the example, but have no corrosion resistance. Therefore, red rust is generated on the evaluation surface after the 50-day exposure test. All the area ratios were 80% or more.

  As described above, the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that those skilled in the art to which the present invention pertains can conceive various changes or modifications within the scope of the technical idea described in the claims. It is understood that these also belong to the technical scope of the present invention.

For example, although the cut product in the above embodiment has a vertically symmetric shape with respect to the center in the plate thickness direction, the present invention is not limited to this example, and may have a vertically asymmetric shape. For example, the length A1 of the _first inclined surface s1 may be shorter than the length A2 of the _second inclined surface s2. Further, the inclination angles θ ₁ and θ ₂ do not necessarily have to be the same.

Reference Signs List 3 cut product 3a cut end face 5 plated steel plate 5a steel plate 5b plating 7 clad material 7a base material 7b coating material 100 cutting tool 110 die 111, 121 base 113 first blade 120 punch 123 second blade

Claims (12)

A cut product formed by cutting a multilayer material obtained by coating the surface of the base material with a coating material,
The cut end face of the cut processed product,
A first inclined surface inclined from the first surface toward the center in the thickness direction,
A second inclined surface inclined from the second surface toward the center in the thickness direction,
A fractured surface formed between the first inclined surface and the second inclined surface;
Consisting of
The first slope and the second slope,
At least a portion is covered with the covering material that covers the surface of the base material,
A cut product in which the thickness of the inclined surface when the cut end surface is viewed from the front satisfies the following relational expression (1).
(T ₁ + T ₂ ) <T (1)
T ₁ = A ₁ cos θ ₁ , T ₂ = A ₂ cos θ ₂
Here, T ₁ is the thickness of the first inclined surface when the cut end surface is viewed from the front, T ₂ is the thickness of the second inclined surface when the cut end surface is viewed from the front, A ₁ the length of the first inclined surface when viewed from the side of the cutting edge, a ₂ is the length of the second inclined surface when viewed from the side of the cutting edge, theta ₁ wherein the the inclination angle of the first inclined surface, the theta ₂ inclination angle of the second inclined surface, T is a thickness of the multilayer material.   The cut product according to claim 1, wherein the first inclined surface and the second inclined surface are linear when the cut end surface is viewed from a side surface. The first ratio of the thickness of the inclined surface T ₁ and the thickness T ₂ of the second inclined surface, satisfies the following relation (2), according to claim 1 or cut the workpiece according to 2.
0.6 ≦ (T ₁ / T ₂ ) ≦ 1.4 (2) The thickness T ₃ of the fracture surface when the cut end face is viewed from the front, satisfy the following relation (3), cutting the workpiece according to any one of claims 1 to 3.
0 <T ₃ ≦ 0.5T (3) The first inclined surface is at least partially covered with a covering material that covers the first surface of the base material,
5. The cut product according to claim 1, wherein the second inclined surface is at least partially covered with a covering material that covers the second surface of the base material. 6.   The cutting process according to any one of claims 1 to 5, wherein an amount of the covering material that covers the first inclined surface and the second inclined surface decreases from the surface toward the center in a plate thickness direction. Goods.   Regarding the first inclined surface and the second inclined surface, a covering material represented by a ratio of a length of a portion where the covering material exists to a length of the inclined surface when the cut end surface is viewed from a side surface. The cut product according to any one of claims 1 to 6, wherein a coverage of each is 20% or more. In the range of 60% or more of the board width of the multilayer material,
Variations in the value of the sum and the ratio of the thickness T ₁ of the first inclined surface and the thickness T ₂ of the second inclined surface is 30% or less,
The variation in the coverage of the coating material, which is represented by the ratio of the length of the portion where the coating material exists to the length of the inclined surface when the cut end surface is viewed from the side, is 30% or less. 8. The cut product according to any one of items 7 to 7.   The cut product according to any one of claims 1 to 8, wherein a thickness t of the base material is 0.2 mm or more and 10 mm or less.   The cut product according to any one of claims 1 to 9, wherein the coating material is made of Zn, Al, or an alloy thereof.   The cut product according to any one of claims 1 to 10, wherein the base material is a steel plate. The cut product according to claim 11, wherein the multilayer material is a plated steel sheet.