JP2023037461A - Manufacturing method of thin strip - Google Patents

Abstract

To provide a manufacturing method of a thin strip which can suppress damage of a rotary die cutter.SOLUTION: A manufacturing method of a thin strip manufactures a thin strip from a thin strip-like material by use of a rotary die cutter which includes an anvil roll and a die roll. The anvil roll includes an anvil roll body. The die roll includes: a die roll body in which a cutting blade protrudes on an outer peripheral surface; and a die roll elastic layer which is arranged at both side of the cutting blade on the outer peripheral surface of the die roll body. When passing the thin strip-like material laid on the surface of an anvil side elastic layer through between the anvil roll and the die roll, the cutting blade of the die roll is pushed into a cutting position of the thin strip-like material so that the elastic force of the anvil side elastic layer applies tensile stress caused by bending to the cutting position of the thin strip-like material, and then, when the cutting blade of the die roll is separated from the cutting position of the thin strip-like material, the elastic force of the anvil side elastic layer and the die roll elastic layer applies tensile stress caused by bend restoration to the cutting position of the thin strip-like material.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a method of manufacturing a thin strip by punching out thin strips from a thin strip material using a rotary die cutter.

2. Description of the Related Art Conventionally, it is often required to manufacture a thin ribbon strip having a predetermined shape from a thin strip material such as a thin metal plate, a thin metal strip, or a metal foil made of a metal material or the like. This is because parts mounted in various machines and electronic devices are often formed from thin strips having such predetermined shapes. Specifically, for example, as described in Patent Document 1, a laminated core used for a motor core or the like is formed by laminating thin strips made of an amorphous alloy or the like. Furthermore, many of the electrodes provided in secondary batteries and fuel cells are formed from thin metal strips.

Conventionally, press punching has been applied as a processing method for manufacturing thin strip pieces of a predetermined shape from a thin strip material, but in recent years, from the viewpoint of improving productivity, etc., a processing method using a rotary die cutter has been adopted. It is supposed to apply.

As a processing method using a rotary die cutter, for example, Patent Document 2 discloses a processing method using a rotary cutter that punches out an extremely thin metal member (thin strip material) such as a thin metal plate or a metal foil into a predetermined shape by shearing. is described. This rotary cutter includes a first rotating member, a second rotating member, and an elastic body. In this rotary cutter, the first rotating member has at least one of a convex portion and a concave portion on its surface. The second rotating member is rotatable in a direction opposite to that of the first rotating member, and has at least one of a convex portion and a concave portion on its surface. The elastic body is attached to at least a portion of the stepped portion of the edge formed by the protrusion or recess of the first rotating member. Further, the elastic body is attached to at least a portion of the stepped portion of the edge formed by the projection or recess of the second rotating member. Then, the metal member is sheared between the edge of the first rotating member and the edge of the second rotating member.

Furthermore, as a processing method using a rotary die cutter, for example, Patent Literature 3 describes a processing method using a die-cutting device provided with a rotary die and an anvil roll. In this device, the rotary die has a die-cut roll and a cutting edge that protrudes radially outward from the die-cut roll, and the cutting edge protrudes from the outer peripheral surface of the die-cut roll along the circumferential direction. A pair of 1 blade parts are included spaced apart in the axial direction of the die cut roll. Furthermore, the rotary die has a sponge that sandwiches the first blade portion in the axial direction of the die-cut roll, and the sponge has a compression ratio of 40% or more at the point where the distance between the die-cut roll and the anvil roll is the shortest. ing. In this die cutting device, when the electrode intermediate is passed between the rotary die and the anvil roll, the cutting edge of the rotary die is caused to enter the thin strip material such as the electrode intermediate body, thereby cutting the thin strip material along the planned cutting line. By doing so, a ribbon piece having a predetermined shape is manufactured from the ribbon material.

WO2017/006868 Japanese Patent No. 6037690 JP 2017-132019 A

On the other hand, a thin strip material made of a metal material or the like has high hardness and low ductility, so it is not easy to cut. For this reason, when using a rotary die cutter such as the rotary cutter described in Patent Document 2 to punch a thin strip material with high hardness and low ductility by shearing, the rotary die cutter wears early. It is easy to damage because it progresses to

Further, when a rotary die cutter such as the die cutting device described in Patent Document 3 is used to cut the thin strip material with a cutting blade to punch out thin strip pieces from the thin strip material, the hardness of the thin strip material At high ductility and low ductility, rotary die cutters are susceptible to damage due to high loads on the cutting edge.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its object is to provide a method for manufacturing a thin strip by punching a thin strip from a thin strip material using a rotary die cutter. Another object of the present invention is to provide a thin strip manufacturing method that can suppress damage to a rotary die cutter.

In order to solve the above problems, the method for producing a thin strip according to the present invention is a method for producing a thin strip by punching a thin strip from a thin strip material using a rotary die cutter equipped with an anvil roll and a die roll. The anvil roll includes an anvil roll main body, and the die roll includes a die roll main body having a cutting edge having a shape corresponding to the peripheral edge of the thin strip piece protruding from the outer peripheral surface, and an outer peripheral surface of the die roll main body. and a die roll elastic layer provided on both sides of the cutting blade, and the method for manufacturing the thin strip piece includes placing the anvil side elastic layer on the die roll side surface of the anvil side elastic layer arranged on the outer peripheral surface of the anvil roll body a punching step of punching the ribbon piece from the ribbon material by cutting the ribbon material at a desired cutting position when the ribbon material is passed between the anvil roll and the die roll; In the punching step, when the cutting edge of the die roll is pushed into the cutting position of the thin strip material, the elastic force of the anvil-side elastic layer acts on both sides of the cutting position of the thin strip material, thereby punching the thin strip material. After applying a tensile stress by bending to the cutting position of the thin strip material, when the cutting edge of the die roll is pulled away from the cutting position of the thin strip material, the elastic force of the anvil-side elastic layer is applied to the cutting position of the thin strip material. The elastic force of the die roll elastic layer acts on both sides of the cut position of the thin strip material, thereby applying a tensile stress due to bending back to the cut position of the thin strip material. The material is cut at the cutting position.

According to the present invention, damage to the rotary die cutter can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows typically the punching apparatus which concerns on 1st Embodiment. FIG. 2 is a schematic plan view showing a ribbon piece punched out from a ribbon material using the method for manufacturing a ribbon piece according to the first embodiment; 3A to 3C are process cross-sectional views schematically showing a method for manufacturing a ribbon piece according to the first embodiment; 3A to 3C are process cross-sectional views schematically showing a method for manufacturing a ribbon piece according to the first embodiment; 3A to 3C are process cross-sectional views schematically showing a method for manufacturing a ribbon piece according to the first embodiment; 3A to 3C are process cross-sectional views schematically showing a method for manufacturing a ribbon piece according to the first embodiment; 4(a) to 4(c) are cross-sectional views schematically showing each stage of the cutting process at the cutting position of the thin strip material in the punching process of the thin strip manufacturing method according to the first embodiment. FIG. It is a side view which shows typically the punching apparatus which concerns on 2nd Embodiment. 4A to 4C are process cross-sectional views schematically showing main parts of a method for manufacturing a thin strip piece according to a second embodiment; (a) to (d) are cross-sectional images showing respective stages of the cutting process in the vicinity of the cutting position of the ribbon material observed when the method for manufacturing the ribbon piece according to the first embodiment is carried out on an actual machine. .

A method for manufacturing a ribbon piece according to an embodiment will be described below.
First, the outline of the method for manufacturing the thin strip according to the embodiment will be described by exemplifying the method for manufacturing the thin strip according to the first embodiment and the second embodiment.

(First embodiment)
FIG. 1 is a side view schematically showing the punching device according to the first embodiment. FIG. 2 is a schematic plan view showing a thin strip punched from a thin strip material using the thin strip manufacturing method according to the first embodiment. 3A to 3D are process cross-sectional views schematically showing the method for manufacturing the strip according to the first embodiment. 4(a) to 4(c) are cross-sectional views schematically showing each stage of the cutting process of the cutting position of the thin strip material in the punching process of the thin strip manufacturing method according to the first embodiment. .

As shown in FIG. 1, the punching device 1 according to the first embodiment includes a material supply section 10, a conveying section 20, a rotary die cutter 30, and a material recovery section 40. As shown in FIG. In the punching device 1 , an amorphous alloy ribbon is supplied as a ribbon material W from a material supply section 10 . The thin strip material W supplied from the material supply unit 10 is transported to the rotary die cutter 30 by the transport unit 20, and the thin strip piece M shown in FIG. The thin strip material W′ after punching is conveyed by the conveying section 20 to the material collecting section 40 and collected by the material collecting section 40 . The thin strips M are obtained by further dividing the thin strips forming each layer of the laminated stator core in the circumferential direction.

The material supply unit 10 has a rotating shaft 11 which is rotatable in the direction of the arrow so that the thin strip material W can be unwound and supplied to the rotary die cutter 30. The thin strip material W is wound around the rotating shaft 11. ing. The conveying section 20 has a pair of conveying rolls 21 that rotate with the thin strip material W therebetween. The pair of transport rolls 21 are arranged so that their rotation axes are parallel to each other, and rotate in opposite directions as indicated by arrows to transport the thin strip material W therebetween. The transport section 20 is arranged upstream and downstream of the rotary die cutter 30 . The material recovery unit 40 has a rotary shaft 41 that is rotatable in the direction of the arrow so that the thin strip material W' after punching can be taken up and recovered.

The rotary die cutter 30 includes an anvil roll 32 and a die roll 34, as shown in FIGS. 1 and 3A-3D. The anvil roll 32 includes an anvil roll body 32A and an anvil roll elastic layer (anvil side elastic layer) 32B. The anvil roll main body 32A is a columnar metal roll that is rotatable about the rotation axis A1. The anvil roll elastic layer 32B is fixed to the outer peripheral surface 32As of the anvil roll main body 32A. The anvil roll 32 rotates in the direction of the arrow about the rotation axis A1 of the anvil roll main body 32A while supporting the thin strip material W by the anvil roll elastic layer 32B. The die roll 34 includes a die roll body 34A and a die roll elastic layer 34B. The die roll main body 34A is a cylindrical metal roll provided rotatably about a rotation axis A2 parallel to the rotation axis A1 of the anvil roll main body 32A, and has a shape corresponding to the peripheral edge of the thin strip M. A blade 34Ac protrudes from the outer peripheral surface 34As. The die roll elastic layer 34B is fixed to both sides of the cutting edge 34Ac of the outer peripheral surface 34As of the die roll main body 34A (the part excluding the part where the cutting edge 34Ac is provided). The die roll 34 rotates in the direction of the arrow around the rotation axis A2 of the die roll main body 34A while supporting the thin strip material W by the die roll elastic layer 34B.

In the rotary die cutter 30, the cutting edge 34Ac of the die roll 34 contacts the outer peripheral surface 32As of the anvil roll body 32A, and in order to avoid damage to the cutting edge 34Ac, the outer peripheral surface 32As of the anvil roll body 32A and the die roll body The shortest distance between the outer peripheral surface 34As of 34A (hereinafter sometimes abbreviated as "shortest distance between roll bodies") d is longer than the height h of the cutting edge 34Ac. Also, in order to ensure that the cutting edge 34Ac of the die roll 34 can be pushed into the cutting position Wp of the thin strip material W in the punching process, the shortest distance d between the roll bodies is determined by the height h of the cutting edge 34Ac and the anvil roll elasticity. It is shorter than the sum of the thicknesses t1 of the layer 32B. Furthermore, when the cutting edge 34Ac of the die roll 34 is pushed into the cutting position Wp of the thin strip material W in the punching process, both sides of the cutting position Wp of the thin strip material W are reliably held between the anvil roll elastic layer 32B and the die roll elastic layer 34B. The thickness t2 of the die roll elastic layer 34B is longer than the height h of the cutting edge 34Ac of the die roll 34 so as to be able to do so.

In addition, in the rotary die cutter 30, the bending angle 180°-α of the thin strip W is controlled so that the magnitude of the tensile stress due to bending applied to the thin strip W is 2500 MPa or more in the punching process. Also, the cutting edge 34Ac of the die roll 34 is adjusted so that the unbending angle β-α of the thin strip W is controlled so that the magnitude of the tensile stress due to unbending applied to the thin strip W is 2500 MPa or more. Edge angle θ, shortest distance between roll bodies d, height h of cutting edge 34Ac of die roll 34, thickness t1 of anvil roll elastic layer 32B, hardness and Young's modulus, and thickness t2 of die roll elastic layer 34B , hardness, Young's modulus, etc. are set.

In the method for manufacturing the thin strip according to the first embodiment, the thin strip M is manufactured by punching the thin strip M from the thin strip material W using the punching device 1 according to the first embodiment. Specifically, as shown in FIGS. 3A to 3D, the thin strip material W placed on the outer peripheral surface 32Bs of the anvil roll elastic layer (anvil-side elastic layer) 32B on the die roll side is placed on the outer peripheral surface 32Bs of the anvil roll elastic layer 32B. and the outer peripheral surface 34Bs of the die roll elastic layer 34B, the anvil roll 32 and the die roll 34 are rotated in opposite directions as indicated by the arrows. As a result, the thin strip W is passed between the outer peripheral surface 32Bs of the anvil roll elastic layer 32B and the outer peripheral surface 34Bs of the die roll elastic layer 34B. At this time, while elastically deforming the anvil roll elastic layer 32B and the die roll elastic layer 34B in contact with the anvil roll side surface and the die roll side surface of the ribbon material W, respectively, the cutting edge 34Ac of the die roll 34 is moved to the die roll. By protruding from the outer peripheral surface 34Bs of the elastic layer 34B, the thin strip material W is pushed into the cutting position Wp, and then the cutting edge 34Ac of the die roll 34 is separated from the thin strip material W cutting position Wp. As a result, the thin strip material W is cut at the cutting position Wp, thereby punching out the thin strip piece M from the thin strip material W (punching step).

When cutting the thin strip material W at the cutting position Wp, the cutting edge 34Ac of the die roll 34 is brought into contact with the cutting position Wp of the thin strip material W as shown in FIG. 2, when the cutting edge 34Ac of the die roll 34 is pushed into the cutting position Wp of the thin strip material W, the pressing force of the cutting edge 34Ac is applied to the cutting position Wp of the thin strip material W, and at the same time the elasticity of the anvil roll elastic layer 32B is increased. By applying force to both sides of the cutting position Wp of the thin strip material W, tensile stress is applied to the anvil roll side of the cutting position Wp of the thin strip material W by bending. At this time, since the shortest distance d between the roll bodies, the height h of the cutting edge 34Ac, the thickness t1 of the anvil roll elastic layer 32B, the hardness, the Young's modulus, etc. are set as described above, the anvil The elastic force of the side elastic layer 32B is preferably set. In addition, by setting the cutting edge angle θ of the cutting edge 34Ac as described above, the bending angle 180°−α at the cutting position of the thin strip material W is preferably controlled, and the tensile stress due to bending is increased. is 2500 MPa or more.

Subsequently, as shown in FIG. 4C, when the cutting edge 34Ac of the die roll 34 is separated from the cutting position Wp of the thin strip material W, the elastic force of the anvil roll elastic layer 32B acts on the cutting position Wp of the thin strip material W. At the same time, the elastic force of the die roll elastic layer 34B is applied to both sides of the cutting position Wp of the thin strip W, thereby applying a tensile stress by bending back to the die roll side of the cutting position Wp of the thin strip W. At this time, the shortest distance d between the roll bodies, the height h of the cutting edge 34Ac, the thickness t1 of the anvil roll elastic layer 32B, hardness, Young's modulus, etc., and the thickness t2 of the die roll elastic layer 34B, hardness Since the thickness, Young's modulus, etc. are set as described above, the elastic force of the anvil roll elastic layer 32B and the elastic force of the die roll elastic layer 34B are preferably set. As a result, the unbent angle β-α at the cutting position of the thin strip material W is suitably controlled, and the magnitude of the tensile stress due to unbending becomes 2500 MPa or more. As described above, by continuously applying a tensile stress due to bending of 2500 MPa or more and a tensile stress due to unbending of 2500 MPa or more to the cutting position Wp of the thin strip W, the thin strip W is cut at the cutting position Wp. disconnect.

In the thin strip manufacturing method according to the first embodiment, the anvil roll 32 and the die roll 34 are continuously rotated to continuously cut the thin strip material W at the cutting positions Wp by the advancing process described above. , a thin strip M is punched out from the thin strip material W. Thus, the thin strip M is manufactured from the thin strip material W.

(Second embodiment)
FIG. 5 is a side view schematically showing a punching device according to the second embodiment. FIG. 6 is a process cross-sectional view schematically showing the main part of the method for manufacturing the ribbon piece according to the second embodiment.

As shown in FIG. 5 , a punching device 51 according to the second embodiment includes a material supply section 60 , a conveying section 70 , a rotary die cutter 80 and a material recovery section 90 . In the punching device 51 , a material sheet L including an elastic sheet (anvil-side elastic layer) E and a thin strip material W placed on the surface Es of the elastic sheet E on the die roll side is supplied from a material supply section 60 . The ribbon material W is an amorphous alloy ribbon. A material sheet L supplied from a material supply unit 60 is conveyed to a rotary die cutter 80 by a conveying unit 70, and the rotary die cutter 80 punches out a thin strip M shown in FIG. The material sheet L′ after punching is conveyed by the conveying section 70 to the material collecting section 90 and collected by the material collecting section 90 .

The material supply unit 60 has a rotating shaft 61 that is rotatable in the direction of the arrow so that the material sheet L can be supplied to the unwinding rotary die cutter 80, and the material sheet L is wound around the rotating shaft 61. . The transport unit 70 has a pair of transport rolls 71 that rotate with the material sheet L sandwiched therebetween. The pair of transport rolls 71 are arranged so that their rotation axes are parallel to each other, and rotate in opposite directions as indicated by arrows to sandwich and transport the material sheet L therebetween. The transport section 70 is arranged upstream and downstream of the rotary die cutter 80 . The material recovery unit 90 has a rotary shaft 91 that is rotatable in the direction of the arrow so that the material sheet L' after punching can be taken up and recovered.

The rotary die cutter 80 includes an anvil roll 82 and a die roll 84, as shown in FIGS. Anvil roll 82 includes anvil roll body 32A. The anvil roll body 32A is similar to the anvil roll body 32A shown in FIG. 3A. The anvil roll 82 rotates about the rotation axis A1 in the direction of the arrow while supporting the material sheet L from the elastic sheet side by the anvil roll main body 32A. The die roll 84 has the same configuration as the die roll 34 shown in FIG. 3A. The die roll 84 rotates in the direction of the arrow about the rotational axis A2 of the die roll main body 34A while supporting the material sheet L from the thin strip material side by the die roll elastic layer 34B.

In the rotary die cutter 80, like the rotary die cutter 30 shown in FIG. 3A, the shortest distance d between the roll bodies is longer than the height h of the cutting edge 34Ac. In addition, the shortest distance d between the roll bodies is the height h of the cutting blade 34Ac and the thickness of the elastic sheet E so that the cutting blade 34Ac of the die roll 84 can be pushed into the cutting position Wp of the thin strip material W in the punching process. is shorter than the sum of t3. Furthermore, the thickness t2 of the die roll elastic layer 34B is longer than the height h of the cutting edge 34Ac of the die roll 84, like the rotary die cutter 30 shown in FIG. 3A.

In addition, in the rotary die cutter 80, similarly to the rotary die cutter 30 shown in FIG. of the cutting edge 34Ac of the die roll 84, the shortest distance d between the roll bodies, the height h of the cutting edge 34Ac of the die roll 84, the thickness t3 of the elastic sheet E, the hardness, and Young's modulus, thickness t2, hardness, Young's modulus, etc. of the die roll elastic layer 34B are set.

In the thin strip manufacturing method according to the second embodiment, as shown in FIG. The anvil roll 82 and the die roll 84 are rotated in opposite directions as indicated by the arrows while sandwiching the thin strip material W between the outer peripheral surface 32As of the anvil roll main body 32A and the outer peripheral surface 34Bs of the die roll elastic layer 34B. As a result, the elastic sheet E and thin strip material W placed on the outer peripheral surface 32As of the anvil roll main body 32A are passed between the outer peripheral surface 32As of the anvil roll main body 32A and the outer peripheral surface 34Bs of the die roll elastic layer 34B. At this time, the elastic sheet E and the die roll elastic layer 34B are elastically deformed while being in contact with the anvil roll side surface and the die roll side surface of the thin strip material W, respectively, and the cutting edge 34Ac of the die roll 84 is moved with the die roll elasticity. By protruding from the outer peripheral surface 34Bs of the layer 34B, it is pushed into the cutting position Wp of the thin strip material W, and then the cutting edge 34Ac of the die roll 84 is separated from the cutting position Wp of the thin strip material W. As a result, the thin strip material W is cut at a desired cutting position Wp, thereby punching out the thin strip piece M from the thin strip material W (punching step).

When cutting the thin strip material W at the cutting position Wp, first, when the cutting blade 34Ac of the die roll 84 is pressed into contact with the cutting position Wp of the thin strip material W, the pressing force of the cutting blade 34Ac is applied to the thin strip material W. At the cutting position Wp, the elastic force of the elastic sheet E is applied to both sides of the cutting position Wp of the thin strip W, thereby applying tensile stress by bending to the anvil roll side of the cutting position Wp of the thin strip W. do. At this time, since the shortest distance d between the roll bodies, the height h of the cutting edge 34Ac, the thickness t3 of the elastic sheet E, the hardness, the Young's modulus, etc. are set as described above, the elastic body The elastic force of the sheet E is set appropriately. In addition, by setting the cutting edge angle θ of the cutting edge 34Ac as described above, the bending angle 180°−α at the cutting position of the thin strip material W is preferably controlled, and the tensile stress due to bending is increased. is 2500 MPa or more.

Subsequently, when the cutting edge 34Ac of the die roll 84 is separated from the cutting position Wp of the thin strip material W, the elastic force of the die roll elastic layer 34B is applied while the elastic force of the elastic sheet E is applied to the cutting position Wp of the thin strip material W. is applied to both sides of the cutting position Wp of the thin strip W, a tensile stress is applied to the die roll side of the cutting position Wp of the thin strip W by bending back. At this time, the shortest distance d between the roll bodies, the height h of the cutting edge 34Ac, the thickness t3, hardness, Young's modulus, etc. of the elastic sheet E, and the thickness t2 and hardness of the die roll elastic layer 34B , Young's modulus, etc. are set as described above, the elastic force of the elastic sheet E and the elastic force of the die roll elastic layer 34B are preferably set. As a result, the unbent angle β-α at the cutting position of the thin strip material W is suitably controlled, and the magnitude of the tensile stress due to unbending becomes 2500 MPa or more. As described above, by continuously applying a tensile stress due to bending of 2500 MPa or more and a tensile stress due to unbending of 2500 MPa or more to the cutting position Wp of the thin strip W, the thin strip W is cut at the cutting position Wp. disconnect.

In the method for manufacturing a thin strip piece according to the second embodiment, the anvil roll 82 and the die roll 84 are continuously rotated to continuously cut the thin strip material W at the cutting position Wp in the advancing process described above. , a thin strip M is punched out from the thin strip material W. Thus, the thin strip M is manufactured from the thin strip material W.

(Effect)
Therefore, according to the method for manufacturing a ribbon piece according to the embodiment, unlike the conventional method of punching the ribbon material by shearing or the conventional method of cutting the ribbon material with a cutting blade, the first And, as in the second embodiment, the thin strip material is cut at the cutting position by continuously applying a tensile stress due to bending and a tensile stress due to unbending to the cutting position of the thin strip material. A thin strip can be manufactured from the material. Therefore, damage to the rotary die cutter can be suppressed.

Next, the details of each configuration in the method for manufacturing the ribbon piece according to the embodiment will be described.

1. Rotary Die Cutter A rotary die cutter includes an anvil roll and a die roll. The anvil roll includes an anvil roll main body, and the die roll includes a die roll main body having a cutting edge having a shape corresponding to the peripheral edge of the thin strip piece protruding from the outer peripheral surface, and the cutting edge on the outer peripheral surface of the die roll main body. and die roll elastic layers on both sides of the blade.

The rotary die cutter includes an anvil roll and a die roll, and is not particularly limited as long as it can be used in the method for manufacturing the strip according to the embodiment. The anvil roll may further include the anvil roll elastic layer provided on the outer peripheral surface of the anvil roll main body, and the anvil roll elastic layer may be the anvil roll elastic layer. Moreover, as a rotary die cutter, for example, the anvil roll may not include an anvil roll elastic layer like the rotary die cutter according to the second embodiment. In such a cutter, the anvil-side elastic layer is an elastic sheet independent of the rotary die cutter.

The anvil roll main body of the anvil roll is a cylindrical member that is rotatable around a rotation axis. The outer peripheral surface of the anvil roll body is not particularly limited, and is usually a cylindrical surface. may be provided on the cylindrical surface. Although the constituent material of the anvil roll body is not particularly limited, it is usually metal. Materials constituting the anvil roll body include, for example, alloy tool steel (material symbol: SKD) and high-speed tool steel (material symbol: SKH) for cold dies specified in Japanese Industrial Standards JIS G 4403:2015. and metals such as high-speed tool steel (material symbol: HAP) manufactured by Hitachi Metals, Ltd.

The anvil roll elastic layer of the anvil roll is not particularly limited as long as it is provided on the outer peripheral surface of the anvil roll main body. It is provided by being fixed to the surface. The type of the anvil roll elastic layer is not particularly limited, but examples thereof include non-foamed resin sheets made of non-foamed resin such as urethane, rubber, and PET. Also, the type of elastic sheet independent from the rotary die cutter is the same as the type of the anvil roll elastic layer.

The die roll main body of the die roll is a cylindrical member that is rotatable about a rotation axis and has cutting edges protruding from its outer peripheral surface. Although the rotation axis of the die roll body is not particularly limited, it is usually parallel to the rotation axis of the anvil roll body. The outer peripheral surface of the die roll main body is not particularly limited, and is usually a cylindrical surface, and may be, for example, a smooth cylindrical surface without irregularities. The constituent material of the die roll main body is the same as the constituent material of the anvil roll main body, and thus the description thereof is omitted here. The cutting edge of the die roll body has a shape corresponding to the peripheral edge of the ribbon. Here, "having a shape corresponding to the peripheral edge of the thin strip" means that the shape of the edge of the cutting edge when the outer peripheral surface of the die roll body is developed on a plane is the same as the peripheral edge of the thin strip. . The cutting edge may be a part of the die roll main body, or may be a member made of a hard material such as a metal other than the die roll main body.

The die roll elastic layer of the die roll is not particularly limited as long as it is provided on both sides of the cutting edge on the outer peripheral surface of the die roll body. It is fixed to the outer peripheral surface. The type of the die roll elastic layer is not particularly limited, but examples thereof include foam sheets and sponge sheets made of foamed resin such as urethane and ethylene vinyl acetate (EVA).

In the rotary die cutter, the shortest distance between the roll bodies (the shortest distance between the outer peripheral surface of the anvil roll main body and the outer peripheral surface of the die roll main body) d is not particularly limited, but usually it is as in the first and second embodiments. In addition, it is longer than the height h of the cutting edge of the die roll. The shortest distance d between the roll bodies is not particularly limited, but is usually shorter than the sum of the height h of the cutting edge and the thicknesses t1 and t3 of the anvil-side elastic layers as in the first and second embodiments. Although the thickness t2 of the die roll elastic layer is not particularly limited, it is preferably longer than the height h of the cutting edge of the die roll as in the first and second embodiments.

The "shortest distance d between the roll bodies" is the distance between the outer peripheral surface of the anvil roll body and the outer peripheral surface of the die roll body on a straight line orthogonal to the rotation axis of the anvil roll body and the rotation axis of the die roll body. Point. The "height h of the cutting edge of the die roll" refers to the dimension from the base end of the cutting edge on the side of the outer peripheral surface of the die roll body to the cutting edge in the radial direction of the die roll body. The "thicknesses t1 and t3 of the anvil-side elastic layer" refer to the dimensions of the anvil-side elastic layer in the radial direction of the anvil roll main body when they are not elastically deformed. The “thickness t2 of the die roll elastic layer” refers to the dimension of the die roll elastic layer in the radial direction of the die roll main body when it is not elastically deformed.

The hardness of the anvil-side elastic layer is not particularly limited, but is preferably higher than the hardness of the die roll elastic layer, and more preferably at least 3 times the hardness of the die roll elastic layer. This is because the thin strip material is supported by the hard anvil-side elastic layer, so that the thin strip material can be prevented from being deformed or shifted, and the thin strip material can be given a sufficient elastic force by the soft die-roll elastic layer. Here, the hardness of the anvil-side elastic layer and the die roll elastic layer is measured by the method specified in Japanese Industrial Standards JIS K 6253-3:2012 or JIS K 7312:1996, for example. That is, the hardness of the anvil-side elastic layer and the die roll elastic layer is, for example, type A durometer hardness (Shore A).

2. Punching process In the punching process, the thin strip material placed on the die roll side surface of the anvil-side elastic layer arranged on the outer peripheral surface of the anvil roll body is cut by the anvil roll and the die roll using the rotary die cutter. The thin strip is punched out from the thin strip material by cutting the thin strip material at a desired cutting position when the thin strip material is passed through the gap.

When the anvil roll further includes the anvil roll elastic layer provided on the outer peripheral surface of the anvil roll body, and the anvil-side elastic layer is the anvil roll elastic layer, in the punching step, the anvil roll elastic By rotating the anvil roll and the die roll in opposite directions while sandwiching the thin strip material placed on the outer peripheral surface of the layer on the die roll side between the anvil roll elastic layer and the die roll elastic layer, the thin strip is formed. A material is passed between the anvil roll elastic layer and the die roll elastic layer.

When the anvil-side elastic layer is an elastic sheet independent of the rotary die cutter, in the punching step, the elastic sheet and the thin strip material placed on the surface of the elastic sheet on the die roll side are By rotating the anvil roll and the die roll in opposite directions while being sandwiched between the anvil roll body and the die roll elastic layer, the elastic sheet and the thin strip material are sandwiched between the anvil roll body and the die roll elastic layer. pass through.

In the punching step, when the cutting edge of the die roll is pushed into the cutting position of the thin strip material, the elastic force of the anvil-side elastic layer is applied to both sides of the cutting position of the thin strip material. After applying a tensile stress by bending to the cutting position of the thin strip material, when the cutting edge of the die roll is pulled away from the cutting position of the thin strip material, the elastic force of the anvil-side elastic layer is applied to the cutting position of the thin strip material. , the elastic force of the die roll elastic layer acts on both sides of the cut position of the thin strip material, thereby applying a tensile stress due to bending back to the cut position of the thin strip material. The strip material is cut at the cutting position.

In the punching process, when passing the thin strip material between the anvil roll and the die roll, as shown in FIG. The elastic force of the anvil-side elastic layer such as the anvil roll elastic layer and the elastic force of the die roll elastic layer may act on the ribbon material. Moreover, when the cutting edge of the die roll is pushed into the cutting position of the thin strip material as shown in FIG. The elastic force of the layer may act on both sides of the cutting position of the ribbon material. Furthermore, as shown in FIG. 4(c), when the cutting edge of the die roll is separated from the cutting position of the thin strip material, the elastic force of the anvil-side elastic layer may act on both sides of the cutting position of the thin strip material. These elastic forces of each elastic layer acting on each portion of the ribbon material at each timing also affect the magnitude of the tensile stress due to bending and the tensile stress due to unbending.

The magnitude of tensile stress due to bending is not particularly limited as long as the thin strip material can be cut at the cutting position, and varies depending on the type and thickness of the thin strip material. In the case of a belt, for example, it is preferably in the range of 2500 MPa or more. This is because the thin strip material can be reliably cut and the thin strip pieces can be punched out from the thin strip material. The magnitude of the tensile stress due to unbending is not particularly limited as long as the thin strip material can be cut at the cutting position, and varies depending on the type and thickness of the thin strip material. In the case of, for example, the range of 2500 MPa or more is preferable. This is because the thin strip material can be reliably cut and the thin strip pieces can be punched out from the thin strip material. Note that the "magnitude of tensile stress due to bending" refers to the magnitude of the maximum tensile stress among the tensile stresses due to bending applied to the cutting position of the ribbon material. The “magnitude of tensile stress due to unbending” refers to the magnitude of the maximum tensile stress among the tensile stresses due to unbending applied to the cutting position of the ribbon material.

The method for adjusting the magnitude of the tensile stress due to bending is not particularly limited. For example, a method for adjusting the size of Here, the “bending angle 180°−α” means the angle α on the die roll side among the angles formed by adjacent portions across the cutting position of the thin strip material when the bending of the cutting position of the thin strip material is maximized. refers to the angle obtained by subtracting from 180°. In this method, the magnitude of the tensile stress due to bending can be increased by increasing the bending angle 180°-α, and the magnitude of the tensile stress due to bending can be increased by decreasing the bending angle 180°-α. can be made smaller.

Conditions that can be set to control the bending angle 180°-α are not particularly limited, but the angle θ of the cutting edge of the die roll, the shortest distance between the roll bodies d, the height h of the die roll cutting edge, Also included are the thicknesses t1 and t3 of the anvil-side elastic layer, hardness, Young's modulus, and the like.

When setting the angle θ of the edge of the cutting edge, the strip material bends along the angle θ of the edge of the cutting edge. can be made larger, and the bending angle 180°-α can be made smaller by making the cutting edge angle θ larger. When setting the shortest distance d between the roll bodies, the height h of the cutting edge of the die roll, and the thicknesses t1 and t3 of the anvil-side elastic layers, the shortest distance d between the roll bodies is set to the height of the cutting edge h and the sum of the thicknesses t1 and t3 of the anvil-side elastic layers, the sum of the shortest distance d between the roll bodies and the sum of the height h of the cutting edge and the thicknesses t1 and t3 of the anvil-side elastic layers By increasing the difference, the bending angle 180°-α can be increased by increasing the elastic force of the anvil-side elastic layer. Furthermore, when setting the hardness or Young's modulus of the anvil-side elastic layer, the elastic force of the anvil-side elastic layer can be increased by increasing the hardness or Young's modulus.

The method for adjusting the magnitude of the tensile stress due to unbending is not particularly limited. A method of adjusting the magnitude of the tensile stress and the like can be mentioned. Here, the "bending back angle β-α" is the angle on the die roll side among the angles formed by adjacent portions across the cutting position of the ribbon material when the bending back of the cutting position of the ribbon material is maximized. Refers to the angle obtained by subtracting the angle α from β. In this method, the magnitude of the tensile stress due to unbending can be increased by increasing the unbending angle β-α, and the tensile stress due to unbending can be increased by decreasing the unbending angle β-α. size can be made smaller.

Conditions that can be set to control the bending back angle β-α are not particularly limited, but for example, the shortest distance d between the roll bodies, the height h of the cutting edge of the die roll, and the thickness t1 of the anvil-side elastic layer. , t3, hardness and Young's modulus, thickness t2 of the die roll elastic layer, hardness and Young's modulus, and the like.

When setting the shortest distance d between the roll bodies, the height h of the cutting edge of the die roll, and the thicknesses t1 and t3 of the anvil-side elastic layers, the shortest distance d between the roll bodies is determined by the height h of the cutting edge and When the thicknesses t1 and t3 of the anvil-side elastic layers are shorter than the sum of the thicknesses t1 and t3 of the anvil-side elastic layers, the difference between the shortest distance d between the roll bodies and the sum of the height h of the cutting edge and the thicknesses t1 and t3 of the anvil-side elastic layers is By making it larger, the elastic force of the anvil-side elastic layer is increased, so that the bendback angle β-α can be increased. Furthermore, when setting the hardness or Young's modulus of the anvil-side elastic layer, the elastic force of the anvil-side elastic layer can be increased by increasing the hardness or Young's modulus. Further, when setting the thickness t2 of the die roll elastic layer, the thickness t2 of the die roll elastic layer is increased to increase the elastic force of the die roll elastic layer, thereby increasing the bending return angle β-α. be able to. Furthermore, when setting the hardness or Young's modulus of the die roll elastic layer, the elastic force of the die roll elastic layer can be increased by increasing the hardness or Young's modulus.

3. Method for manufacturing ribbon A method for manufacturing a ribbon is a method for manufacturing a ribbon by punching a ribbon from a ribbon material using the above-described rotary die cutter, and includes the punching step.

The ribbon material is not particularly limited as long as it can be punched into ribbon pieces, but it preferably has a Vickers hardness in the range of 300 HV or more and 900 HV or less, and among these, an amorphous alloy ribbon is preferable. This is because damage to the rotary die cutter can be more effectively suppressed. The term "Vickers hardness" refers to the Vickers hardness of a strip material in a Vickers hardness test according to JIS Z2244 (2009), for example, with a test force of 0.01 kgf and a load holding time of 10 seconds.

The thickness of the ribbon material is not particularly limited as long as the ribbon piece can be punched, and varies depending on the type of the ribbon material. It is within the range of 0.030 mm or less.

Although the thin strip is not particularly limited, for example, a thin strip that forms each layer of a laminated core such as a stator core and a rotor core in a motor for vehicle use, etc., and a thin strip that is further divided in the circumferential direction. mentioned.

EXAMPLES Hereinafter, the method for manufacturing the thin strip according to the embodiment will be described more specifically with reference to examples and test examples.

[Example]
First, a CAE (Computer Aided Engineering) simulation was carried out on the method for manufacturing the strip according to the first embodiment. Specifically, first, a calculation model of a rotary die cutter was produced by modeling the following configuration. Further, a calculation model of the ribbon material was produced by modeling an actual amorphous alloy ribbon (thickness: predetermined value).

(Configuration of rotary die cutter)
Outer diameter of anvil roll body: predetermined value Thickness t1 of anvil roll elastic layer: predetermined value Hardness of anvil roll elastic layer (Shore A): predetermined value Young's modulus of anvil roll elastic layer: predetermined value Outer diameter of die roll body: Die roll elastic layer thickness t2: predetermined value Die roll elastic layer hardness (Shore A): predetermined value Young's modulus of die roll elastic layer: predetermined value Die roll cutting edge height h: predetermined value Cutting edge angle θ: specified value Shortest distance between roll bodies d: specified value

Next, using predetermined CAE software, using a rotary die cutter and a computational model of the ribbon material, the process of punching a ribbon piece from the ribbon material under predetermined punching conditions was analyzed (punching process).

FIGS. 4(a) to 4(c) show the stress distribution at each stage of the cutting process in the vicinity of the cutting position of the strip material obtained by the CAE simulation analysis of the embodiment. As shown in FIGS. 4(a) to 4(c), in the analysis results of the cutting process near the cutting position of the thin strip material, when the cutting edge of the die roll is pushed into the thin strip material cutting position, the thin strip material After the tensile stress due to bending is applied to the anvil roll side of the cutting position of the thin strip material, when the cutting edge of the die roll is pulled away from the cutting position of the thin strip material, the tensile stress due to bending back is applied to the die roll side of the cutting position of the thin strip material. applied. Further, according to the analysis results, the magnitude of the tensile stress due to bending was 2500 MPa or more on the anvil roll side surface, and the magnitude of the tensile stress due to bending back was 2500 MPa or more on the die roll side surface.

Subsequently, the thin strip manufacturing method according to the first embodiment was performed in an actual machine under the same conditions as the CAE simulation. Specifically, first, an actual rotary die cutter was prepared. The configuration of the actual rotary die cutter was the same as the configuration modeled in the calculation model of the rotary die cutter. Also, as the ribbon material, an actual amorphous alloy ribbon identical to that modeled in the computational model of the ribbon material was prepared.

Next, using an actual rotary die cutter, under the same punching conditions as in the CAE simulation, a test was conducted in which a strip piece was punched out from an actual amorphous alloy ribbon (punching step). As a result, the thin strip could be punched out from the thin strip material, and the thin strip could be manufactured.

FIGS. 7(a) to 7(d) show each stage of the cutting process in the vicinity of the cutting position of the thin strip material observed when the thin strip manufacturing method according to the first embodiment is carried out on an actual machine. It is a cross-sectional image. Note that these cross-sectional images were taken using a predetermined imaging method. As shown in FIGS. 7( a ) to 7 ( d ), when the thin strip manufacturing method of the embodiment is carried out on an actual machine, the cutting edge (not shown) of the die roll is positioned at the cutting position of the thin strip material. The ribbon bent at the cutting position when it was pushed into the die roll, and unbent at the cutting position of the ribbon when the cutting edge of the die roll was pulled away from the cutting position of the ribbon. When the thin strip material is bent at the cutting position, the thin strip material is not cut at the cutting position. entered and the strip material was cut at the cutting position.

Considering the above implementation results, when the method for manufacturing the thin strip according to the first embodiment is implemented on an actual machine, the tensile stress due to bending and the tensile stress due to unbending are continuous with respect to the cutting position of the thin strip. It is considered that the thin strip material was cut at the cutting position when the bending of the thin strip material was restored. It is considered that the continuous cutting at the cutting position of the thin strip material made it possible to punch out the thin strip pieces from the thin strip material. Furthermore, from the above implementation results, when the ribbon material is the actual product amorphous alloy ribbon, the magnitude of the tensile stress due to bending is 2500 MPa or more, and the magnitude of the tensile stress due to unbending is 2500 MPa or more. If it is 2500 MPa or more, it is considered that the thin strip material can be reliably cut at the cutting position and the thin strip pieces can be punched out from the thin strip material.

[Test Example 1-1]
As the rotary die cutter, the shape of the cutting edge protruding from the outer peripheral surface of the die roll body corresponds to the peripheral edge of the thin strip M shown in FIG. , an aluminum layer, and a polypropylene layer in this order were used. At that time, the conditions of the rotary die cutter were set as shown in Table 1 below.

[Test Example 1-2 and Test Example 1-3]
A thin strip was produced in the same manner as in Test Example 1-1, except that the conditions of the rotary die cutter were set as shown in Table 1 below.

[Test Examples 2-1 to 2-3]
Test Example 1-1 except that a thin strip material (thickness: 0.30 mm) made of an aluminum layer was used as the thin strip material, and the conditions of the rotary die cutter were set as shown in Table 1 below. A method for producing a thin strip was carried out in the same manner as in the above.

[Test Examples 3-1 to 3-3]
Test Example 1-1 except that a thin strip material (thickness: 0.015 mm) made of an aluminum layer was used as the thin strip material, and the conditions of the rotary die cutter were set as shown in Table 1 below. A method for producing a thin strip was carried out in the same manner as in the above.

[Test Examples 4-1 to 4-3]
Test Example 1-1 except that a thin strip material (thickness: 0.10 mm) made of a lead layer was used as the thin strip material, and the conditions of the rotary die cutter were set as shown in Table 1 below. A method for producing a thin strip was carried out in the same manner as in the above.

[Test Examples 5-1 to 5-3]
Test Example 1-1 except that a thin strip material (thickness: 0.05 mm) made of a lead layer was used as the thin strip material, and the conditions of the rotary die cutter were set as shown in Table 1 below. A method for producing a thin strip was carried out in the same manner as in the above.

[Test Example 6-1 and Test Example 6-2]
A thin strip was produced in the same manner as in Test Example 1-1, except that the conditions of the rotary die cutter were set as shown in Table 1 below.

[Test Example 7-1 and Test Example 7-2]
A thin strip was produced in the same manner as in Test Example 1-1, except that the conditions of the rotary die cutter were set as shown in Table 1 below.

[Test Example 8-1 and Test Example 8-2]
A thin strip was produced in the same manner as in Test Example 1-1, except that the conditions of the rotary die cutter were set as shown in Table 1 below.

[Test Example 9-1 and Test Example 9-2]
A thin strip was produced in the same manner as in Test Example 1-1, except that the conditions of the rotary die cutter were set as shown in Table 1 below.

[Test Example 10-1 and Test Example 10-2]
A thin strip was produced in the same manner as in Test Example 1-1, except that the conditions of the rotary die cutter were set as shown in Table 1 below.

[result]
The results of punching thin strips in the thin strip manufacturing method of each test example are shown in Table 1 below together with the type of thin strip material used in the thin strip manufacturing method of each test example.

As shown in Table 1 above, by changing the setting of the cutting edge angle θ of the die roll cutting edge, the hardness of the anvil roll elastic layer, and the thickness and Young's modulus of the die roll elastic layer, the thin strip was punched out. results have changed. From this, it is considered that by changing the setting of these conditions, the magnitude of the tensile stress due to bending and the magnitude of the tensile stress due to unbending are adjusted, and whether or not the thin strip material can be cut is changed.

Although the embodiments according to the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention described in the claims. Design changes can be made.

30 rotary die cutter 32 anvil roll 32A anvil roll main body 32As outer peripheral surface 32B anvil roll elastic layer 32Bs outer peripheral surface 34 die roll 34A die roll main body 34Ac cutting edge 34As outer peripheral surface 34B die roll elastic layer 34Bs outer peripheral surface W ribbon material Wp cutting position M ribbon piece 80 rotary die cutter 82 anvil roll 84 die roll L material sheet E elastic sheet Es surface on the die roll side

Claims (3)

A method for manufacturing a thin strip by punching a thin strip from a thin strip material using a rotary die cutter equipped with an anvil roll and a die roll, comprising:
The anvil roll includes an anvil roll main body, and the die roll includes a die roll main body having a cutting edge having a shape corresponding to the peripheral edge of the thin strip and protruding from the outer peripheral surface, and the cutting edge on the outer peripheral surface of the die roll main body. and a die roll elastic layer provided on both sides of the blade,
In the method for manufacturing the thin strip, the thin strip material placed on the die roll side surface of the anvil side elastic layer disposed on the outer peripheral surface of the anvil roll body is passed between the anvil roll and the die roll. a punching step of punching the thin strip piece from the thin strip material by cutting the thin strip material at a desired cutting position;
In the punching step, when the cutting edge of the die roll is pushed into the cutting position of the ribbon material, the elastic force of the anvil-side elastic layer is applied to both sides of the cutting position of the ribbon material, thereby cutting the ribbon. After applying a tensile stress by bending to the cut position of the thin strip material, when the cutting edge of the die roll is pulled away from the cut position of the thin strip material, the elastic force of the anvil-side elastic layer is applied to the cut position of the thin strip material. , the elastic force of the die roll elastic layer acts on both sides of the cutting position of the thin strip material, thereby applying a tensile stress due to bending back to the cutting position of the thin strip material. A method for manufacturing a thin strip, comprising cutting the strip at the cutting position. The anvil roll further includes the anvil roll elastic layer provided on the outer peripheral surface of the anvil roll main body,
The anvil-side elastic layer is the anvil roll elastic layer,
In the punching step, the thin strip material placed on the outer peripheral surface of the anvil roll elastic layer on the die roll side is sandwiched between the anvil roll elastic layer and the die roll elastic layer, and the anvil roll and the die roll are moved in opposite directions. 2. The method of manufacturing a thin strip piece according to claim 1, wherein the thin strip material is passed between the anvil roll elastic layer and the die roll elastic layer by rotating the thin strip material. The anvil-side elastic layer is an elastic sheet independent from the rotary die cutter,
In the punching step, the anvil roll and the die roll are sandwiched between the anvil roll main body and the die roll elastic layer while the elastic sheet and the thin strip material placed on the die roll side surface of the elastic sheet are sandwiched between the anvil roll and the die roll. 2. The method of manufacturing a ribbon piece according to claim 1, wherein the elastic sheet and the ribbon material are passed between the anvil roll main body and the die roll elastic layer by rotating in opposite directions.

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