JP2023008147A - rotary die cutter - Google Patents

Abstract

To provide a rotary die cutter that can improve cutting performance.SOLUTION: A rotary die cutter includes a die roll and an anvil roll. The die roll includes a die roll body having a cutting edge having a shape corresponding to the contour of a thin band piece provided on an outer peripheral surface. The anvil roll includes an anvil roll body having a groove into which the cutting edge of the die roll body can be fitted provided on an outer peripheral surface. The cutting edge includes a curved part curved so as to be protrude in an opposite direction to a rotation direction of the die roll body in plan view of the outer peripheral surface of the die roll body. The curved part of the cutting edge has a gradient that becomes higher in the opposite direction to the rotation direction of the die roll body. A thin band piece can be punched from a thin band material by fitting the cutting edge of the die roll body into the groove in the anvil roll body and pushing it into the thin band material, thus cutting the thin band material.SELECTED DRAWING: Figure 4B

Description

TECHNICAL FIELD The present disclosure relates to a rotary die cutter used for punching ribbon pieces from a ribbon material.

2. Description of the Related Art Conventionally, manufacturing has been carried out by punching out a thin strip piece of a predetermined shape from a thin strip material such as a thin metal strip, non-woven fabric, paper, cloth, resin, or the like. BACKGROUND ART In recent years, a rotary die cutter has been applied to a method of punching a ribbon piece from a ribbon material from the viewpoint of improving productivity. A rotary die cutter punches a thin strip material by a compressive force generated between a pair of rolls rotating in opposite directions to pass the thin strip material between the rolls.

As such a rotary die cutter, for example, one of the pair of rolls is provided with a concave portion having a contour substantially the same as the desired shape, and the other roll is provided with a contour that is one size larger than the concave portion. A convex part of the shape is provided, a pair of rolls are rotated while synchronizing, and the outline of the object to be cut sandwiched between them is cut using the overlapping part of the convex part and the concave part. A cutting device is known (Patent Document 1). With this cutter, the strip-like non-cut material is punched into a desired shape due to the proximity of the members of the two rolls, so chipping is extremely unlikely to occur.

In addition, as the rotary die cutter, one roll of the pair of rolls is a roll having a V-shaped cross section on the outer peripheral surface, and the other roll is a roll having a flat outer peripheral surface. It is known that the cutting edge of one roll contacts the flat outer peripheral surface of the other roll along the contour line of the cutting edge. For example, in Patent Document 2, as such a cutter, a convex portion is provided around the outer periphery of the cutting edge of the die cutter roll, a concave portion is provided at a position facing the convex portion on the cylindrical roll, and supplied between the rolls. A sheet to be cut is pushed into a concave portion by a convex portion.

Furthermore, the rotary die cutter includes an anvil roller that supports and rotates an object, a die cutter that rotates with a convex blade that cuts the object, and a die cutter that is arranged on the outer peripheral surface of the anvil roller to cut the object. A first elastic part that is elastically deformed in contact with the back surface of the object at times, and a second elastic part that is arranged on the outer peripheral surface of the die cutter and is elastically deformed in contact with the surface of the object when cutting the object. is known (Patent Document 3). In this cutter, wear of the convex blade can be suppressed by causing a tensile force to act on the object to develop a crack originating from the biting portion of the convex blade, thereby breaking the object. Further, as a rotary die cutter, for example, there is known one that applies tension in the width direction of the work by a predetermined mechanism at the time of cutting (Patent Document 4).

JP 2015-188964 A Japanese Utility Model Laid-Open No. 5-85599 JP 2020-116634 A Japanese Unexamined Patent Application Publication No. 2005-1012

In the cutter described in Patent Document 1, for example, the ribbon strip has a contour including a minute curved portion that tapers in the cutting direction from the ribbon material and that is convex at the tip in the cutting direction. In the case of punching , the material tends to lean toward the portion where the outline of the ribbon piece is slightly curved, and wrinkles may occur. Even with the cutter described in Patent Document 3, a similar problem may occur in this case. On the other hand, in the cutter disclosed in Patent Document 2, the thin strip material to be cut, which is supplied between the rolls, is pushed into the recessed portions with the convex portions so that the thin strip material is cut while being pulled. The effect of suppressing the generation of wrinkles in the strip material is obtained. Also, the cutter described in Patent Document 3 can also wrinkle the thin strip material by applying tension in the width direction of the thin strip material at the time of cutting by a predetermined mechanism. However, in the case of punching out a ribbon piece having a contour including a curved portion that is convex in the cutting direction from a ribbon material, as in Patent Documents 2 and 3, the ribbon material is cut in the planar direction. Even if an attempt is made to suppress the occurrence of wrinkles in the ribbon material by pulling it with tension, there is a possibility that the occurrence of wrinkles cannot be sufficiently suppressed. Therefore, there is a demand for a rotary die cutter that can sufficiently suppress the generation of wrinkles in the ribbon material and improve the cutting performance.

SUMMARY OF THE INVENTION The present invention has been made in view of these points, and an object of the present invention is to provide a rotary die cutter capable of improving cutting performance.

In order to solve the above problems, the rotary die cutter of the present invention includes a die roll and an anvil roll, and is a rotary die cutter used for punching a thin strip piece from a thin strip material, wherein the die roll comprises the thin strip A die roll body having a cutting edge having a shape corresponding to the contour of the piece is provided on the outer peripheral surface, and the anvil roll is provided with a groove on the outer peripheral surface in which the cutting edge of the die roll body can be fitted. Including a main body, the cutting edge includes a curved portion that is curved so as to be convex in a direction opposite to the rotational direction of the die roll body in a plan view of the front outer peripheral surface of the die roll body, The curved portion has a gradient whose height increases in a direction opposite to the direction of rotation of the die roll body, and by rotating the die roll body and the anvil roll body in opposite directions to each other, the ribbon material is When passing between the die roll and the anvil roll, the cutting edge of the die roll body is fitted into the groove of the anvil roll body and pushed into the thin strip material to cut the thin strip material. and punching the thin ribbon piece from the thin ribbon material.

According to the present invention, cuttability can be improved.

1 is a schematic side view showing a punching device including a rotary die cutter according to a first embodiment; FIG. FIG. 2 is a schematic plan view showing a ribbon piece punched out from a ribbon material using the rotary die cutter according to the first embodiment; 1 is a schematic perspective view showing a rotary die cutter according to a first embodiment; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic side view explaining the structure of the rotary die cutter which concerns on 1st Embodiment. A cross section perpendicular to the rotation axis A1 of the die roll body when the boundary between the curved portion of the cutting edge of the die roll body and other parts shown in FIG. 4A is on the straight line L, and includes the cutting edge of the cutting edge It is the figure which showed the projection drawing which looked at the cutting edge of the die-roll main body represented by the schematic sectional drawing and the schematic sectional drawing from the straight line L direction. It is a schematic side view explaining the structure of the rotary die cutter which concerns on 2nd Embodiment.

A rotary die cutter according to an embodiment of the present invention will be described below.
First, the outline of the rotary die cutter according to the embodiment will be described by exemplifying the first embodiment and the second embodiment.

(First embodiment)
FIG. 1 is a schematic side view showing a punching device including a rotary die cutter according to the first embodiment. FIG. 2 is a schematic plan view showing a ribbon piece punched from a ribbon material using the rotary die cutter according to the first embodiment.

As shown in FIG. 1, the punching device 1 includes a material supply device 10, a rotary die cutter 30 according to the first embodiment, and a material recovery device 40, which are sequentially arranged in the conveying direction indicated by the white arrow. are placed. The punching device 1 further comprises two material conveying devices 20 which are arranged respectively upstream and downstream of the rotary die cutter 30 in the conveying direction.

The material supply device 10 has a rotating shaft 11 which is rotatable in the direction indicated by the dashed arrow so that the thin strip material M can be unwound and supplied to the rotary die cutter 30 . is wrapped. The ribbon material M is an amorphous alloy ribbon. The material conveying device 20 has a pair of conveying rolls 21 that rotate with the thin strip M sandwiched therebetween. The pair of transport rolls 21 are arranged so that their rotation axes are parallel to each other, and rotate in mutually opposite directions as indicated by dashed arrows to sandwich and transport the thin strip material M therebetween. The material recovery device 40 has a rotating shaft 41 which is rotatable in the direction indicated by the dashed arrow so that the thin strip material M' after punching can be taken up and recovered.

In the punching device 1, first, the ribbon material M supplied from the material supply device 10 is transported to the rotary die cutter 30 by the material transport device 20 on the upstream side. Next, a rotary die cutter 30 is used to punch out a thin strip piece P shown in FIG. The thin strip P has a contour including a minute curved portion Pr that is curved to be convex outward. Next, the thin strip material M′ after punching is transported to the material recovery device 40 by the material transport device 20 on the downstream side, and recovered by the material recovery device 40 .

The rotary die cutter 30 according to the first embodiment will be described in detail below. FIG. 3 is a schematic perspective view showing the rotary die cutter according to the first embodiment. FIG. 4A is a schematic side view explaining the structure of the rotary die cutter according to the first embodiment;

The rotary die cutter 30 includes a die roll 32 and an anvil roll 34 as shown in FIGS. 1, 3 and 4A.

The die roll 32 includes a die roll body 32A, as shown in FIGS. 3 and 4A. The die roll main body 32A is a cylindrical mold, and is rotatable about its central axis parallel to the rotation axis of the transport roll 21 as the rotation axis A1. A cutting edge 32Ac is provided on the outer peripheral surface 32As of the die roll main body 32A. The cutting edge 32Ac of the die roll main body 32A has a shape corresponding to the outline of the strip P. As shown in FIG. That is, the shape of the cutting edge 32Ae of the cutting edge 32Ac is equal to the contour of the thin strip P in plan view of the outer peripheral surface 32As of the die roll main body 32A. The cutting edge 32Ac is a minute curved portion that is curved so as to be convex in a direction opposite to the direction of rotation of the die roll body 32A (the direction indicated by the dashed arrow) in a plan view of the outer peripheral surface 32As of the die roll body 32A. Contains 32Ar. The curved portion 32Ar of the cutting edge 32Ac is a portion that forms the curved portion Pr of the strip P. As shown in FIG. In the die roll 32, the die roll main body 32A rotates in the direction indicated by the dashed arrow while pressing the thin strip material M with the outer peripheral surface 32As of the die roll main body 32A about the rotation axis A1.

Anvil roll 34 includes an anvil roll body 34A, as shown in FIGS. 3 and 4A. The anvil roll main body 34A is a cylindrical mold, and is rotatable with its center axis parallel to the rotation axis A1 as the rotation axis A2. The outer peripheral surface 34As of the anvil roll main body 34A is provided with a groove 34Ac in which the cutting edge 32Ac of the die roll main body 32A can be fitted with a gap S therebetween. The shape of the groove 34Ac in plan view when the outer peripheral surface 34As of the anvil roll main body 34A is developed into a plane is substantially the same as the contour of the strip P. As shown in FIG. Further, the groove 34Ac has a shape that allows the cutting edge of the die roll body to be fitted with gaps in the width direction and the depth direction of the groove. In the anvil roll 34, the anvil roll main body 34A rotates in the direction indicated by the dashed arrow while supporting the thin strip material M by the outer peripheral surface 34As of the anvil roll main body 34A about the rotation axis A2.

Here, the main part of the die roll main body 32A will be explained in more detail. In addition, below, the rotation direction of 32 A of die-roll main bodies may be abbreviated as a "rotation direction." Also, a straight line L orthogonal to the rotation axis A1 and the rotation axis A2 may be abbreviated as "straight line L". 4B is a cross section perpendicular to the rotation axis A1 of the die roll body when the boundary between the curved portion of the cutting edge of the die roll body and other portions shown in FIG. 4A is on the straight line L, and the cutting edge of the cutting edge and a projection view of the cutting edge of the die roll main body shown in the schematic cross section viewed from the direction of the straight line L.

The curved portion 32Ar of the cutting edge 32Ac of the die roll main body 32A has a slope in which the height H increases in the direction opposite to the direction of rotation, as shown in the cross-sectional view of FIG. 4B. Specifically, the height H of the cutting edge 32Ac is H0 in the other portion (portion other than the curved portion) 32Ao on the rotational direction side of the curved portion 32Ar, and is H0 in the curved portion 32Ar from the rotational direction side. The height gradually increases from H0 toward the opposite direction. Furthermore, as shown in the cross-sectional view of FIG. 4B, when the boundary 32Ab between the curved portion 32Ar of the cutting edge 32Ac and the other portion 32Ao is on the straight line L, the cutting edge 32Ae at each site of the curved portion 32Ar of the cutting edge 32Ac , coincides with the position in the straight line L direction of the cutting edge 32Ae at the boundary 32Ab of the cutting edge 32Ac. At this time, the side E of the protruding portion 32Ars, which protrudes in the height direction from the other portion 32Ao of the curved portion 32Ar of the cutting edge 32Ac, is parallel to the straight line L in the direction opposite to the rotational direction. Then, as shown in FIG. 4B, the curvature radius of the curved shape of the cutting edge 32Ae of the curved portion 32Ar of the cutting edge 32Ac in the projection view of the cutting edge 32Ac viewed from the direction of the straight line L is defined as R1, and the central angle of the curved shape is 1 /2 is θ, the outer diameter of the die roll main body 32A is R2, and the height of the other portion 32Ao of the cutting edge 32Ac is H0. The dimension D is Da represented by the following formula (1), and the dimension (dimension of the side E) dL of the projecting portion 32Ars of the curved portion 32Ar in the direction of the straight line L is represented by the following formula (2). dLa.

ここで、式（２）中のＢは、下記式（３）で定義される。

Here, B in the formula (2) is defined by the following formula (3).

In addition, in the rotary die cutter 30, the width of the base end portion of the cutting edge 32Ac of the die roll body 32A is equal to or less than the width of the groove 34Ac of the anvil roll body 34A. The width of the groove 34Ac is set so that the clearance between the cutting edge 32Ae of the cutting edge 32Ac and the edge of the groove 34Ac is, for example, about five times the thickness of the thin strip M (about 20 μm to 30 μm). The height of the cutting edge 32Ac and the clearance between the roll bodies 32A and 34A are set so that the depth of the cutting edge 32Ac pushed into the groove 34Ac is, for example, about five times the thickness of the strip material M. ing.

When the thin strip P is punched out from the thin strip material M by the rotary die cutter 30 according to the first embodiment, as shown in FIGS. The thin strip material M is rotated between the die roll 32 and the anvil roll 34 by rotating the die roll body 32A and the anvil roll body 34A in opposite directions as indicated by the dashed arrows while being sandwiched between the outer peripheral surfaces 34As of the roll body 34A. pass through. At this time, the thin strip material M is placed between both sides in the width direction of the base ends of the cutting edges 32Ac of the outer peripheral surface 32As of the die roll main body 32A and both sides in the width direction of the grooves 34Ac on the outer peripheral surface 34As of the anvil roll main body 34A. The cutting edge 32Ac of the die roll main body 32A is pressed into the thin strip material M while the die roll main body 32A is being pressed while the groove 34Ac of the anvil roll main body 34A has a gap S in the width direction and depth direction of the groove.

As a result, on both sides of the groove 34Ac of the anvil roll main body 34A in the width direction, the pinched portion Ms of the thin strip M is pinched between the outer peripheral surface 32As of the die roll main body 32A and the outer peripheral surface 34As of the anvil roll main body 34A. are restrained by the pressing force of the die roll body 32A and the pressing force of the anvil roll body 34A. At the same timing, the cutting edge 32Ac of the die roll main body 32A pushes down the pressing position Mp where the cutting edge 32Ac is pushed in the ribbon material M. In this way, the thin strip material M is cut at the pressed position Mp by applying a tensile stress due to bending and a tensile stress due to restraint to the pressed position Mp of the thin strip material M. By continuously rotating the die roll 32 and the anvil roll 34, such cutting of the thin strip material M is caused continuously, and the thin strip pieces P are punched out from the thin strip material M repeatedly.

According to the first embodiment, as shown in FIG. 4B, the curved portion 32Ar of the cutting edge 32Ac of the die roll main body 32A has a gradient in which the height H increases in the direction opposite to the direction of rotation. Therefore, when the cutting edge 32Ac of the die roll main body 32A is pushed into the thin strip material M in order to punch out the thin strip P from the thin strip material M by the rotary die cutter 30, each part of the curved portion 32Ar of the cutting edge 32Ac is thin. The timing at which the boundary 32Ab of the cutting edge 32Ac is pushed into the strip M can be brought closer to the timing at which the boundary 32Ab of the cutting edge 32Ac is pushed into the strip M. As a result, it is possible to suppress the occurrence of wrinkles due to the material being skewed at the portion of the ribbon material M where the minute curved portion Pr of the contour of the ribbon piece P is formed. Therefore, it is possible to improve the cuttability when cutting the thin strip material M, and to punch out the thin strip piece P with high shape accuracy. Furthermore, the cost can be reduced because there is no need for equipment for applying tension to suppress the occurrence of wrinkles.

Furthermore, as shown in the cross-sectional view of FIG. 4B, when the boundary 32Ab of the cutting edge 32Ac is on the straight line L, the position of the cutting edge 32Ae in the direction of the straight line L at each part of the curved portion 32Ar of the cutting edge 32Ac It coincides with the position of the cutting edge 32Ae in the direction of the straight line L at the boundary 32Ab of 32Ac. The dimension D in the direction perpendicular to the rotation axis A1 and the straight line L of the curved portion 32Ar is Da represented by the above formula (1), and the dimension of the projecting portion 32Ars of the curved portion 32Ar in the direction of the straight line L. dL is dLa represented by the following formula (2). As a result, the timing at which each portion of the curved portion 32Ar of the cutting edge 32Ac in the rotational direction is pushed into the ribbon M can be made the same as the timing at which the boundary 32Ab of the cutting edge 32Ac is pushed into the ribbon M. As a result, it is possible to remarkably suppress the generation of wrinkles in the thin strip material M, and to remarkably improve the cuttability.

(Second embodiment)
FIG. 5 is a schematic side view explaining the structure of the rotary die cutter according to the second embodiment.

As shown in FIG. 5, in the rotary die cutter 30 according to the second embodiment, the die roll 32 includes a die roll body 32A and a die roll elastic layer (die roll side elastic body) 32B. Different from the form. The die roll elastic layer 32B is fixed to both sides in the width direction of the base end of the cutting edge 32Ac of the outer peripheral surface 32As of the die roll body 32A, and extends to adjacent regions in the width direction of the base end of the cutting edge 32Ac. exist. In the die roll 32, the die roll body 32A rotates about the rotation axis A1 in the direction indicated by the dashed arrow while the thin strip material M is pressed by the die roll elastic layer 32B. In the rotary die cutter 30, the thickness of the die roll elastic layer 32B is thicker than the height of the cutting edge 32Ac.

When the thin strip P is punched out from the thin strip material M by the rotary die cutter 30 according to the second embodiment, as shown in FIG. The thin strip material M is passed between the die roll 32 and the anvil roll 34 by rotating the die roll main body 32A and the anvil roll main body 34A in opposite directions to each other as indicated by the dashed arrows while being sandwiched between the outer peripheral surface 34As of the thin strip material M. Let At this time, while pressing the thin strip M between the die roll elastic layer 32B and both sides in the width direction of the grooves 34Ac of the outer peripheral surface 34As of the anvil roll body 34A, the cutting edge 32Ac of the die roll body 32A is moved to the anvil roll body. The groove 34Ac of 34A is fitted with a gap S in the width direction and the depth direction of the groove, and is pushed into the thin strip material M. As shown in FIG.

As a result, in adjacent regions on both sides of the groove 34Ac of the anvil roll main body 34A in the width direction, the nipped portion Ms of the thin strip material M, which is pinched between the die roll elastic layer 32B and the anvil roll main body 34A, is replaced by the die roll elastic layer. It is constrained by the elastic force of 32B and the pressing force of the anvil roll main body 34A. At the same timing, the cutting edge 32Ac of the die roll body 32A is projected from the outer peripheral surface 32Bs of the die roll elastic layer 32B, so that the cutting edge 32Ac of the die roll body 32A pushes down the pressing position Mp where the cutting edge 32Ac is pushed in the thin strip material M. . In this way, the thin strip material M is cut at the pressed position Mp by applying a tensile stress due to bending and a tensile stress due to restraint to the pressed position Mp of the thin strip material M. By continuously rotating the die roll 32 and the anvil roll 34, such cutting of the thin strip material M is caused continuously, and the thin strip pieces P are punched out from the thin strip material M repeatedly.

According to the second embodiment, effects similar to those of the first embodiment can be obtained. Furthermore, by constraining the pinched portion Ms of the thin strip M by the elastic force of the die roll elastic layer 32B, the tensile stress due to the restraint can be effectively applied to the pressing position Mp of the thin strip M. FIG.

Next, details of each configuration of the rotary die cutter according to the embodiment will be described.

1. Die Roll The die roll includes a die roll main body provided with a cutting edge having a shape corresponding to the outline of the thin strip on its outer peripheral surface. The cutting edge includes a curved portion that is curved in a convex shape in a direction opposite to the rotating direction of the die roll body in a plan view of the front outer peripheral surface of the die roll body. The curved portion of the cutting edge has a slope whose height increases in the direction opposite to the direction of rotation of the die roll body.

Although the die roll main body is not particularly limited, it is a cylindrical mold as in the first and second embodiments, and is provided rotatably about its central axis as a rotation axis. The outer peripheral surface of such a die roll body may be, for example, a smooth cylindrical surface without irregularities, or may be a cylindrical surface provided with projections or recesses for fixing the die roll elastic layer. The constituent material of the die roll body is not particularly limited, but for example, alloy tool steel (material symbol: SKD) and high-speed tool steel (material symbol : SKH) and high-speed tool steel manufactured by Hitachi Metals, Ltd. (material symbol: HAP).

Regarding the cutting edge of the die roll main body, "having a shape corresponding to the contour of the thin strip" means, for example, that the shape of the cutting edge of the cutting blade is equal to the contour of the thin strip in plan view of the outer peripheral surface of the die roll main body. point to In other words, it means that the shape of the edge of the cutting edge in a plan view when the outer peripheral surface of the die roll main body is developed on a plane is the same as the outline of the thin strip. The cutting edge may be a part of the die roll main body, or may be a member separate from the die roll main body. If the cutting edge is a separate member, it consists of a hard material such as, for example, metal.

The curved portion of the cutting edge of the die roll body is not particularly limited as long as it has the above-described gradient. When the boundary between the curved part of the cutting edge and the other part) is on the straight line L, the position of the cutting edge in the direction of the straight line L at each part of the curved part of the cutting edge is the straight line of the cutting edge at the boundary between the curved part of the cutting edge and the other part It is preferable that the position coincides with the position in the L direction or is positioned closer to the anvil roll main body than the position in the straight line L direction of the cutting edge at the boundary between the curved portion of the cutting edge and the other portion. Specifically, as in the first and second embodiments, R1 is the curvature radius of the curved shape of the cutting edge of the curved portion of the cutting edge in the projection view of the cutting edge viewed from the direction of the straight line L, and the curved shape 1/2 of the central angle of θ is defined as θ, the outer diameter of the die roll body 32A is defined as R2, and the height of the other portion of the cutting edge is defined as H0. The dimension D in the direction is Da represented by the following formula (1), and the dimension dL in the direction of the straight line L of the protrusion projecting in the height direction from the other part of the cutting edge in the curved part of the cutting edge is , dLa represented by the following formula (2) or more. This is because the occurrence of wrinkles in the ribbon material can be remarkably suppressed, and the cuttability can be remarkably improved.

ここで、式（２）中のＢは、下記式（３）で定義される。

Here, B in the formula (2) is defined by the following formula (3).

Although the die roll is not particularly limited, it preferably further includes a die roll elastic layer provided on both sides of the base end portion of the cutting edge on the outer peripheral surface of the die roll body as in the second embodiment. This is because the elastic force of the elastic layer of the die roll can restrain the pinched portion of the ribbon material.

Examples of the die roll elastic layer include those fixed to the outer peripheral surface of the die roll body by adhesion, welding, mechanical bonding, or the like. 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).

2. Anvil Roll The anvil roll includes an anvil roll main body provided with grooves on the outer peripheral surface thereof into which the cutting blades of the die roll main body can be fitted.

Although not particularly limited, the anvil roll main body is a cylindrical mold as in the first and second embodiments, and is provided rotatably about its central axis as a rotation axis. The outer peripheral surface of such an anvil roll body may be, for example, a smooth cylindrical surface without irregularities. The constituent material of the anvil roll main body is the same as the constituent material of the die roll main body, and thus the description thereof is omitted here.

The groove of the anvil roll body is not particularly limited as long as it is a groove that can be fitted with the cutting edge of the die roll body. Movable grooves are preferred. This is because the thin strip material can be cut at the pressed position by applying a tensile stress due to bending and a tensile stress due to restraint to the pressing position where the cutting edge is pushed into the thin strip material. The grooves of the anvil roll main body may be grooves that allow the cutting edges of the die roll main body to be fitted in a state without gaps.

Regarding the groove of the anvil roll main body, "the cutting edge of the die roll main body can be fitted" means, for example, that the shape of the groove in plan view when the outer peripheral surface of the anvil roll main body is developed on a plane is the outline of the thin strip. It refers to a shape having a width that is approximately equal and can include the planar view shape of the cutting edge of the cutting edge when the outer peripheral surface of the die roll main body is developed on a plane. "The cutting edge of the die roll body can be fitted with a gap" means, for example, a shape that allows the cutting edge of the die roll body to be fitted with a gap in the width direction and depth direction of the groove. refers to having

3. Rotary Die Cutter A rotary die cutter is a rotary die cutter that includes the die roll and the anvil roll and is used for punching a thin strip from a thin strip material. When the thin strip material is passed between the die roll and the anvil roll by rotating the die roll and the anvil roll, the cutting edge of the die roll main body is fitted into the groove of the anvil roll main body and pushed into the thin strip material. By cutting the thin strip material in this way, the thin strip pieces are punched out from the thin strip material.

The rotary die cutter is not particularly limited as long as the cutting edge of the die roll main body is fitted into the groove of the anvil roll main body and pushed into the thin strip material, but as in the first and second embodiments, the die roll main body While pressing the strip material between both sides of the base end portion of the cutting edge on the outer peripheral surface and both sides of the groove on the outer peripheral surface of the anvil roll body, the cutting edge of the die roll body is moved to the anvil roll. It is preferable that the grooves of the main body are fitted with a gap therebetween and then pushed into the thin strip material. This is because the thin strip material can be cut at the pressed position by applying a tensile stress due to bending and a tensile stress due to restraint to the pressing position where the cutting edge is pushed into the thin strip material. As the rotary die cutter, the cutting edge of the die roll main body may be fitted into the groove of the anvil roll main body so as not to have a gap, and pressed into the strip material. In this case, the thin strip material can be cut by destroying the structure of the thin strip material at the pressing position where the cutting edge of the die roll main body is pushed by the compressive force.

As a rotary die cutter, as in the second embodiment, between the die roll elastic layer provided on both sides of the base end of the cutting edge on the outer peripheral surface of the die roll main body and both sides of the groove on the outer peripheral surface of the anvil roll main body The cutting edge of the die roll main body may be pushed into the ribbon material while pressing the ribbon material. This is because the elastic force of the elastic layer of the die roll can restrain the pinched portion of the ribbon material.

In the rotary die cutter, the "width of the base end of the cutting edge" is the width of the base end of the cutting edge on the outer peripheral surface side of the die roll body, and the cutting edge on the outer peripheral surface of the die roll body is an elongated bar. It refers to the dimension in the direction perpendicular to the direction in which the Further, the "width of the groove" is the width of the opening of the groove of the anvil roll body, and refers to the dimension in the direction perpendicular to the direction in which the groove extends on the outer peripheral surface of the anvil roll body. "Clearance between the cutting edge of the die roll body and the edge of the groove of the anvil roll body" is the edge of the cutting edge and the opening edge of the groove when the cutting edge of the cutting edge is at the deepest position inside the groove. It refers to the dimension in the width direction of the groove. The "depth of the cutting edge pushed into the groove" refers to the dimension from the opening surface of the groove to the cutting edge of the cutting edge when the cutting edge of the cutting edge is at the deepest position inside the groove. The “clearance between roll bodies” refers to the distance between the outer peripheral surface of the anvil roll body and the outer peripheral face 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. The "height of the cutting edge" refers to the dimension of the cutting edge in the radial direction of the die roll body from the base end portion on the side of the outer peripheral surface of the die roll body to the cutting edge. The “thickness 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 ribbon material is not particularly limited as long as it can be punched into a ribbon piece, but it preferably has a Vickers hardness in the range of 300 HV or more and 900 HV or less, and among them, an amorphous alloy ribbon is preferable. This is because the effect of suppressing damage to the cutter due to abrasion of the cutting edge of the die roll body or the like can be obtained remarkably. 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. is within the range of

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 rotary die cutter according to the embodiment will be described more specifically with reference to examples.

[Example]
An actual rotary die cutter according to the first embodiment was prepared, and an amorphous alloy ribbon was prepared as a ribbon material. Then, a test was conducted in which a ribbon piece was punched out from the ribbon material using an actual rotary die cutter. As a result, strips could be repeatedly punched out from the amorphous alloy strip, and a plurality of strips could be produced.

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 die roll 32A die roll main body 32As outer peripheral surface 32Ac cutting edge 32Ar curved portion 32Ars projecting portion 32Ao other portion (portion other than the curved portion)
32Ab Boundary 32Ae Cutting edge 32B Die roll elastic layer 32Bs Outer peripheral surface 34 Anvil roll 34A Anvil roll body 34As Outer peripheral surface 34Ac Groove M Thin strip material Ms Clamped portion Ms Pressing position P Thin strip piece

Claims (1)

A rotary die cutter comprising a die roll and an anvil roll and used for punching a thin strip from a thin strip material,
The die roll includes a die roll main body provided with a cutting edge having a shape corresponding to the contour of the thin strip on the outer peripheral surface,
The anvil roll includes an anvil roll main body provided with a groove on the outer peripheral surface in which the cutting edge of the die roll main body can be fitted,
The cutting edge includes a curved portion that is curved so as to be convex in a direction opposite to the rotation direction of the die roll body in a plan view of the front outer peripheral surface of the die roll body,
The curved portion of the cutting edge has a gradient whose height increases in the direction opposite to the direction of rotation of the die roll body,
When the thin strip material is passed between the die roll and the anvil roll by rotating the die roll body and the anvil roll body in opposite directions, the cutting edge of the die roll body is moved to the anvil roll body. A rotary die cutter that punches out the ribbon piece from the ribbon material by cutting the ribbon material by fitting the ribbon material into the groove and pushing the ribbon material into the ribbon material.

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