JP2012055975A - Rotary cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutter that minimizes burr to be produced when punching a plastically deformable thin sheet-like body such as a metal foil.SOLUTION: A rotary cutter for punching a workpiece W by cooperation of a punch roll 1 provided with a convex punch 3 and a die roll provided with a concave die 4, allows shear punching with minimum burr by installing an elastic body 6 at an end of the punch comprising a hard material. The rotary cutter preferably cuts metals of about several μm to 200 μm thick and foils which can be plastically deformed.

Description

The present invention relates to a rotary cutter for punching a foil by shearing.

  A rotary cutter typically feeds a thin plate-like object (hereinafter referred to as “work”) between a die cutter having a cutting edge and an anvil roll that receives the blade, and rotates both rolls in opposite directions. By doing so, it is widely known as a technique for mainly cutting a workpiece by “push-cutting”.

  A typical rotary cutter is shown in Patent Document 1. This rotary cutter mainly cuts and punches workpieces such as cloth and paper. The rotary cutter is excellent in its durability and punching efficiency, and is a very productive means.

  This method is easy to use for workpieces such as cloth and paper that are effective for press-cutting. However, the main cutting process is push-cutting, for example, if a thin sheet of ductile metal is to be punched, it will cause plastic deformation following the elastic deformation before cutting, causing frequent burrs and burrs, etc. Has the disadvantage that it cannot be used.

Therefore, various proposals have been made up to the present.

Patent Document 2 describes an improved technique for cutting a metal foil. This is because the punch is not made of a hard material as in the prior art, but the punch is made of a synthetic resin, and the die is perforated in a desired shape. A method of punching a workpiece at the deformed portion is described. This method is effective to some extent, for example, for punching out a necessary part as small as about 10 mm, but it cannot exert a sufficient effect on the generation of burrs and burrs. Further, when an unnecessary part is punched out instead of a necessary part, a large pressure is applied to the entire necessary part via an elastic body. Therefore, it cannot be used for metal foils or workpiece materials that are deformed or destroyed when pressure is applied.

Patent Document 3 describes means for punching a foil-shaped workpiece that undergoes plastic deformation and the like, which cannot be solved in Patent Document 1 and Patent Document 2. This method is a method in which cutting is performed without bringing the die and the punch into close contact with each other. By using this method, it is possible to punch a foil made of a material that causes plastic deformation such as metal. However, in this method, when the workpiece is made of a material having a relatively large deformation resistance, for example, copper foil, the copper foil bends in the recess of the die with the edge of the die and punch as a fulcrum as shown in FIG. In addition, warping occurs on the punch side at the front and rear of the edge portion. Also, especially in the case of rotary cutters, it is difficult to hold the workpiece sufficiently during cutting, and not only shearing force but also tensile force is generated at the cutting part, so it has a sufficient effect on the generation of burrs and burrs. There was a problem that it could not be demonstrated.

Japanese Patent No. 2593570 JP-A-62-214835 International republication number WO2010 / 013818 A1

In this invention, it is a subject to cut | disconnect favorably the foil of the material which raise | generates the metal and the plastic deformation which could not be achieved with the conventional rotary cutter, suppressing generation | occurrence | production of a burr | flash and a crack.

In order to cut the foil well, using a rotary cutter with a convex punch on the punch roll side and a concave die on the die roll side, the punch elasticity for the purpose of assisting the punching of the foil at least at the tip of the punch The problem was solved by installing a body.

  Using a rotary cutter, a foil made of a material that easily undergoes plastic deformation can be punched with as little deformation and burrs as possible during cutting. Examples of materials that easily cause plastic deformation include ductile metals, but the rotary cutter of the present invention can be well punched even with ductile metal-containing materials and organic materials that cause the same plastic deformation phenomenon.

  In addition, because of the rotary method, the productivity is significantly higher than that of a die method in which a general punch and die move up and down.

  There are various types of rotary cutters for punching, but a typical one has a substantially product-shaped convex cutting edge 3 on the die cutter side as shown in FIG. This is a method of punching a thin workpiece W. This method is push-cutting. For foil-like workpieces that cause plastic deformation such as ductile metal to crush and deform and cut the workpiece, deformation due to plastic deformation, burrs, burrs, etc. Can not be used because of the large occurrence.

There is also a rotary cutter that uses a slitter with a sharp edge instead of punching. A typical structure is shown in FIG. In this method, a resin or elastic layer 17 is provided on the surface of the anvil roll 2, and the slitter 16 is pressed through the workpiece to perform cutting. In this method, the slitter has a sharp cutting edge. However, since the slitter is pressed against the anvil roll and cut, the cutting mechanism is pushed. Foil-like metal can be cut, but mainly because of the compressive force to be pressed, burrs and burrs are generated in the vicinity of the cut part, and the part near the cut part is also greatly deformed following the deformation of the resin and elastic body. Problems arise. All of these techniques are processing by pressing the foil. If processing by pressing is used for a material that is easily plastically deformed, such as a ductile metal, the pressed portion is deformed and crushed, so a burr remains in the product. Furthermore, with a rotary cutter with a sharp blade, once cutting occurs in the roll direction only, stress tends to concentrate at the tip of the cutting location, and cutting while controlling the generation of burrs is also possible. Is possible. However, the cutting of the roll in the axial direction is exactly the same as that of the push-off rotary cutter as shown in FIG. 10, and the same problem occurs. In this task, the shape of the workpiece to be punched is assumed to be compatible with various shapes as well as a straight shape, so this type of rotary cutter is not suitable for use. Therefore, in the present invention, the problem of burrs and burrs was solved by punching the foil by shear cutting so as not to push as much as possible.

  The present invention will be described below.

The present invention according to claim 1 of the present invention is a rotary cutter comprising a combination of a punch roll and a die roll that rotate in opposite directions and punch the foil passing between the two in one step. The roll has an approximately product-shaped convex punch, and the die roll has a die that is a substantially concave recess corresponding to the punch shape. Perforation processing is performed without the outer circumferences interfering with each other,
It is a rotary cutter in which a punch elastic body for the purpose of assisting punching is attached to at least a part of the tip of the punch.

As shown in FIG. 1, the punch roll 1 side has a convex punch 3 having at least the same contour as the punched shape. It is expressed that the punch elastic body 6 is attached to at least the tip of the punch, and the punch elastic body 6 is attached to the punch base 5. The die roll 2 has a recessed die 4 corresponding to the punch and having substantially the same shape.
“Punching in one step” means that the punching process is completed by one approach of the die and the punch. For example, it is different from the form of processing in which the foil is temporarily punched by the approach of the first die and the punch and completely punched by the second approach.

  As shown in FIG. 2, the rotation outermost periphery (7, 8) of the punch base and the die do not interfere with each other.

  The rotary cutter according to the present invention is characterized in that, in the rotary cutter described above, a punch elastic body for assisting punching is installed at the tip of the punch.

Using these, as shown in FIG. 3, the part corresponding to the edge of the punch base located at the back of the punch elastic body of the convex punch part and the workpiece sandwiched by the edge of the die concave part are sheared into a desired shape Punch with force.

  The workpiece W moves simultaneously following the rotation of the punch roll and the die roll. When the supplied workpiece is fed to a portion where the width of the punch roll and the die roll becomes narrower than a certain width, the edge portion of the die that contributes to cutting and the edge portion of the punch that is closest to this via the elastic body for punch Shear force is generated by the shearing force.

  When shearing the foil, for example, as shown in the cited document 3, the shearing force acts strongly on the line connecting the convex part of the punch and the concave part of the die and the edges, and from the point where the breaking stress is exceeded. Breaking progresses from time to time. However, although the present invention mentions foil as an object of cutting, the foil ranges from several mm to several hundred mm for example. For this reason, the breakage is in a state in which the corresponding workpiece portions are sequentially cut according to the rotation of the punch roll and the die roll.

This will be described with reference to the schematic diagrams of FIGS. It is assumed that the convex punch 3 in the drawing punches one product portion from the workpiece W. Due to the approach of the die 4 and the punch, first, the front side (leading portion) in the traveling direction of the product portion is first cut as shown in FIG. 13 (11). Immediately before cutting, the workpiece is connected to both the front and back in the direction of travel, so that tension is applied in the front-rear direction in which the workpiece travels, and shearing is performed well. On the other hand, when the punch roll and the die roll are rotated as they are and the work advances, as shown in FIG. 14, the tension in the moving direction does not work on the leading portion 9 cut first. Accordingly, when cutting at the rear end in the direction of travel of the product, the relative positions of the punch and die edge portions and the workpiece are likely to be displaced, and it becomes difficult to sufficiently transmit the shearing force to the cutting portion. Cannot be cut completely (18). Moreover, as shown in FIG. 16, even if it can be cut, burrs and burrs 19 remain very large and cannot be used for cutting for products that require a high-quality cut surface.

  Therefore, in the present invention, an elastic body for punch for fixing a workpiece at the time of cutting is installed at the tip of the punch. Before and after the head portion of the product portion is cut, the workpiece W including the cut head portion is sandwiched and fixed between the punch elastic body 6 and the die, as shown in FIG.

  Since the punch elastic body is compressed, the work can be sufficiently fixed as the reaction force. In this state, when the die and the base of the punch are further approached, a shearing force is exerted on the workpiece to allow shearing.

  After cutting the head portion of the product portion, the head portion is not subjected to stress, so that the head portion 9 can move freely as shown in FIG.

  When the workpiece further advances and rotates to near the end of the product, as shown in FIG. 6, the vicinity of the cutting portion at the end is fixed by the punch elastic body and the die. Therefore, the cutting of the last part can be processed in the same manner as the tip part with the workpiece sufficiently fixed.

  Further, it is preferable that the punch size of the substantially product-shaped convex portion is equal to or larger than the size of the substantially identical concave die, because it is easy to fix the product at the time of cutting, but as shown in FIG. The shape of the punch is not limited to an arcuate flat shape as shown in FIG. 4, and if the shape can properly transmit a shearing force from the edge portion of the punch base toward the workpiece, the size of the punch itself There is no limit.

  The rotary cutter of the present invention does not contact the punch and the die, and the tip edge portion of the punch does not directly contact the workpiece, so that the life of the punch can be kept long. Further, when the work is made of a ductile metal, it is possible to suppress the metal adhesion to the die or the punch due to contact with the punch as much as possible.

Regarding the cutting in the rotational direction of the roll, burrs and burrs can be reduced to some extent even with the prior art, and the main problem arises in the axial cutting. Therefore, in this description, problems and solutions for the axial cutting of the roll are mainly shown.

  According to the second aspect of the present invention, the elastic body for punch is polypropylene, acrylic resin, polyethylene terephthalate, polycarbonate, bakelite, plastic, fluororesin, epoxy resin, polyurethane, polyvinyl chloride, polyamide, polyethylene, vinyl chloride, hard rubber. The rotary cutter according to claim 1, wherein the rotary cutter is made of any one kind or two or more kinds of synthetic fibers. The most required characteristic for the elastic body for punch is to transmit the shearing force generated between the edge of the punch base and the edge of the die recess to the cutting part of the work. It is possible to fix appropriately by pinching.

From both viewpoints, punch elastic bodies are made of polypropylene, acrylic resin, polyethylene terephthalate, polycarbonate, bakelite, plastic, fluororesin, epoxy resin, polyurethane, polyvinyl chloride, polyamide, polyethylene, vinyl chloride, hard rubber, and synthetic fibers. It is desirable to configure from either. These materials can accurately transmit a shearing force from the edge portion of the base of the punch to the workpiece by being deformed. In addition, for example, ductile metal foils such as aluminum foil and copper foil and non-metal foil materials that easily cause plastic deformation can secure a coefficient of friction, which contributes to fixing of the workpiece during cutting.

  The invention according to claim 3 is the rotary cutter according to claim 1 or 2, wherein the punch elastic body has a height in the radial direction of the rotary cutter of 50 μm or more and 5 mm or less. .

  If the height (thickness) of the punch elastic body is too thin, it will be difficult to secure a sufficient work for fixing the workpiece. Conversely, if the thickness is too thick, the deformation of the punch elastic body itself will be too large and transmitted. The stress is dispersed, and it becomes difficult to reliably cut the work portion to be cut. The minimum value of the height of the punching elastic body is preferably at least 50 μm, and even when it is thick, the shearing force can be secured and the workpiece can be fixed properly by setting the height to within 5 mm.

In addition, said height is radial direction height from the operation | movement outermost periphery of a punch base (7 in FIG. 2).

  The present invention according to claim 4 and claim 5 is any one of claims 1 to 3, wherein the punch portion of the portion excluding the punch elastic body and the die have an elastic coefficient of 150 GPa or more. It is a rotary cutter of description.

The punch base and the die have edges according to the shape of the workpiece to be punched. When cutting by these, a shearing force is generated on the workpiece between the punch and die edge as a base point. Here, if the punch base and the die are subjected to stress through the punch elastic body, if the material is easily deformed, the punch base and the die are deformed without securing the shear stress. Therefore, the punch base and the die need to be made of a material that is not easily deformed by stress. Therefore, the material of the punch and die has an elastic modulus of 150 GPa or more, preferably 200 GPa or more. This applies to fiber reinforced plastics, wrought iron, steel, tool steel, cemented carbide, ceramics and the like.

  A sixth aspect of the present invention is the rotary cutter according to any one of the first to fifth aspects, wherein a die elastic body for assisting punching is attached to the concave portion of the die.

  By attaching the die elastic body to the concave portion of the die, first, deformation of the workpiece W when stress is applied by the punch 3 and the die 4 as shown in FIG. 18 can be reduced. This is not a big problem when punching a foil having a low deformation resistance such as an aluminum foil, but it is a problem when punching a foil having a high deformation resistance such as a copper foil. In order to solve this, in addition to providing the punch elastic body at the tip of the punch, the deformation can be suppressed by inserting the elastic body into the concave portion of the die and punching with higher cut surface quality can be performed. it can.

In addition, since the friction to the workpiece is given not only from the die cutter side but also from the anvil roll side, the workpiece is more securely fixed during cutting.

  In the present invention according to claim 7, the material of the elastic body for die is at least one of rubber, resin, rosin, natural rubber, synthetic rubber, natural sponge, synthetic sponge, rubber sponge, and foamed plastic, or 2 It is a rotary cutter of Claim 6 which consists of a material more than a seed | species.

The material of the die elastic body is not particularly limited, but those having extremely low friction against the workpiece are not preferable. If the friction is too low, it is conceivable that the role of sufficiently fixing the work whose tip has been cut cannot be played. The foil as the work is mainly made of metal foil or a material that easily exhibits plastic deformation, but it is desirable that the foil has sufficient friction against these. More suitable materials were rubber, resin, rosin, natural rubber, synthetic rubber, natural sponge, synthetic sponge, rubber sponge, foamed plastic and the like.

  The present invention according to claim 8 is characterized in that the die elastic body protrudes from -2 mm to 3 mm on the basis of the outermost outer periphery of the recessed edge of the die roll excluding the die elastic body. It is a rotary cutter in any one of Claim 6 or Claim 7.

  The die elastic body is installed in the concave portion of the die and is particularly effective for cutting and punching a foil having a large deformation resistance. And it is preferable to have protruded in the outer peripheral direction -2 mm or more and 3 mm or less with respect to the operation | movement outermost periphery of die | dye. The state of protruding −2 mm is a state where the die is depressed 2 mm with respect to the outermost outer periphery of the die, and if it is 0 mm, it is the same as the arc of the die. FIG. 8 is a schematic diagram of the die elastic body 8 having different protrusion amounts (14, 15).

  If this protrusion amount is too large, it will hinder the rotation of the work and punch elastic body, and the more preferable upper limit is 3 mm. When punching many workpieces if the thickness is 3 mm or less, it is possible to apply a stress for fixing the workpiece without obstructing the progress of the workpiece and the elastic body for punch during rotation. On the other hand, if the protruding amount is too small, the stress for fixing the workpiece at the time of cutting cannot be sufficiently exerted. The lower limit of the protruding amount is more preferably -2 mm. If the value is lower than this, stress for fixing the workpiece may not be sufficiently secured, and burrs and burrs may increase, and the cut surface quality of the product may deteriorate.

Moreover, as for the shape of the elastic body for die | dye, as shown to FIG. 8 (A)-(C), the shape of the part protruded may be circular arc shape, but as an example shows to FIG. 9 (D)-(G) Further, a flat shape, a shape having a counterbore inside, a shape in which a fixing block is inserted into the counterbore, or a shape that suppresses deformation of the work and can always fix the work at the time of cutting may be used.

Further, the rotary cutter of the present invention can be applied to the case where the product is punched out as shown in FIG. 1 or the case where the remaining portion becomes the product shape, as shown in FIG. It is also possible to cope with a shape having a punched portion.

In addition, by using cemented carbide and ceramics as the die and punch material, the stress generated between the edge of the die recess and the edge of the punch becomes difficult to disperse, and only burrs and burrs that occur during cutting are reduced. In addition, the wear resistance is improved. It is further advantageous to improve wear resistance and to make at least the portion corresponding to the edge of the concave portion of the die of the rotary cutter made of cemented carbide, ceramics, and diamond-like carbon.

Example 1
The workpiece was a copper foil having a thickness of 20 μm.

  As shown in FIG. 1, the rotary cutter was formed with a closed pattern having a linear part and a curved part in the product shape, and each piece was cut at 200 rpm (200 rpm) for one minute. The test was performed for 50 minutes, and the evaluation was performed when 10,000 sheets were cut.

The die and the punch base were made of cemented carbide (elastic modulus 550 GPa), and the punch elastic body was fixed to the punch base using an adhesive. The punch elastic body was tested with several types and heights.

As evaluation items, each workpiece was cut, evaluated whether it could be cut, and compared with the dimensional accuracy in the roll rotation direction and the maximum burr height (hereinafter referred to as “burr height”).
Whether or not the pattern can be cut was evaluated by checking whether or not the entire pattern shape was cut.

  For the dimensional accuracy in the rotation direction, the length of the cut product corresponding to the portion indicated by the die roll C-C ′ in FIG. 1 was measured. The reference for the length of C-C ′ is the actual pattern length corresponding to the C-C ′ portion of the manufactured die, and the length is 100 mm.

  As shown in FIG. 17, the maximum burr height is a value D3 obtained by measuring the length D1 of the portion 19 most protruding from the cut product and subtracting the thickness D2 of the cut product before cutting.

  Under the above conditions, the material and height of the punch elastic body were changed and the operation was performed under the above conditions, and the evaluation was performed.

Table 1 shows the material and height of the punch elastic body, and Table 2 shows the evaluation of the rotary cutter using each punch elastic body.

Samples numbered with “*” in the table are comparative samples outside the scope of the present invention.

Samples numbered with “*” in the table are comparative samples outside the scope of the present invention.

Table 1 and Table 2 show the following.

First, the comparative sample * 31 not using the punching elastic body could not cut the entire circumference along the outer diameter of this workpiece. On the other hand, the rotary cutter of the present invention was able to be punched well after the test was completed. Moreover, the processing precision was 0-0.1 mm with respect to the applicable part dimension (100 mm) of die | dye. Since the workpiece was plastically deformed, elongation was observed in the direction of roll rotation in any sample, but the value was extremely small. The burr height was good at 15 μm or less for all samples, but the sample where the height of the elastic body for punching was set between 50 μm and 5 mm was particularly excellent, and the burr height was 10 μm or less. It was. Regarding the material of the elastic body for punch, the tested polypropylene, acrylic resin, polyethylene terephthalate, polycarbonate, bakelite, plastic, fluororesin, epoxy resin, polyurethane, polyvinyl chloride, polyamide, polyethylene, vinyl chloride, hard rubber, synthetic fiber Both were good.

(Example 2)
In Example 1, the workpiece was punched with a copper foil having a thickness of 20 μm. However, in this example, the material and thickness of the work were changed, and the punch elastic body had a height that exhibited excellent characteristics in Example 1. Using 2 mm polypropylene, aluminum foil and copper foil as workpieces, and aluminum foil and copper foil coated with a battery active material on the surface were used for experiments using workpieces with different thicknesses. Other conditions are the same as those in the first embodiment. Regarding the evaluation, the sample coated with the battery active material was also evaluated for whether the active material was damaged or peeled off.

  In general, copper foil and aluminum foil are different in ease of deformation, and aluminum foil is soft and relatively easy to deform, but tends to have high burr. On the other hand, the copper foil has a lower burr height than the aluminum foil, but requires a shearing force for cutting.

  Moreover, although the active material for a battery is easy to cut | disconnect by shearing, if high pressure is applied besides a cutting part, it will cause a crack and peeling from a metal, and is not preferable.

  Table 3 shows the types of workpieces, and Table 4 shows the same evaluation results as in Example 1.

  From the results of Tables 3 and 4, it was confirmed that the rotary cutter of the present invention can be cut well regardless of the material and thickness of the metal foil. The accuracy and burr height were also 0.1 mm or less and 10 μm or less, respectively.

Furthermore, no cracking or peeling was observed in the active material, and there was no noticeable destruction of the structure even when the active material for the battery was applied to the metal foil. From this, it was confirmed that the rotary cutter of the present invention was not subjected to a large stress except for the cutting part of the workpiece and was cut well by a shearing force.

Example 3
Next, using the punch elastic body of Example 2, the workpiece was No. As a copper foil coated with 14 battery active materials, a test was conducted in which a die elastic body was provided in the concave portion of the die.

As the die elastic body, an olefin-based elastomer, which is an elastomer-based resin, is used and has an arc shape as shown in (A) to (C) of FIG. The same test as in Example 2 was performed by changing the amount of protrusion. Since all samples could be cut and the accuracy was almost unchanged within a good range, the evaluation was performed with the burr height and the active material state. The results are shown in Table 5.

From the results shown in Table 5, the burr height can be kept low even when the die elastic body is used, and the burr height can be made lower than when the die elastic body is not used. Furthermore, the burr height could be made extremely low at 5 μm or less under the condition where the protruding amount of the die elastic body was −2 mm to +3 mm.

Further, although not described in Example 3, the elastic body for the die is made of rubber, resin, rosin, natural rubber, synthetic rubber, natural sponge, synthetic sponge, rubber sponge under the same conditions as in Example 3 and others. A test using foamed plastic was performed, but in any case, cutting was possible, the accuracy was ± 0.2 mm or less, and the burr height was 8 μm at the maximum.

Example 4
Next, the elastic body for punch No. 1 of Example 1 was used. 9 (polyethylene terephthalate) was used, the workpiece was a copper foil having a thickness of 10 μm, and the other conditions were the same as in Example 1 except that the punch and die were changed from cemented carbide to another material.

Table 6 shows the changed punch and die materials, and Table 7 shows the punching results of the workpiece.

From the results shown in Tables 6 and 7, it was found that the higher the elastic modulus of the die and punch, the lower the burr height tends to be, and that the elastic modulus is 150 GPa or more, both can be cut better.

Further, even if the punch and die materials are combined differently, there is no problem in implementation, but the accuracy and burr height are approximately the same as the results of using the material having the lower elastic modulus for both the punch and die.

Schematic diagram showing embodiments of the present invention Explanatory drawing for the outermost working circumference Schematic diagram of punching according to the present invention Cutting the head State after the top is cut Cutting the tail Example of elastic body for punch Schematic diagram of protruding amount of elastic body for die Example of elastic body for die Schematic diagram showing another embodiment of the present invention Schematic diagram of a conventional rotary cutter Schematic diagram of a conventional rotary cutter Schematic diagram of punching failure (initial punching) Schematic diagram of punching failure (middle punching) Schematic diagram of punching defects (cutting defects) Schematic diagram of defective punching (occurrence of burrs and burrs) Schematic diagram of warp generated on workpiece Explanatory diagram of burr height

1 punch roll 2 die roll (anvil roll in the conventional example)
3 Punch (convex part)
4 Dies (recesses)
5 Punch base 6 Punch elastic body 7 Punch operation outermost periphery 8 Die operation outermost periphery 9 Top part of workpiece being punched 10 Roll rotation direction 11 Shear crack 12 Die elastic body 13 Fixed block 14 Die elastic body Overhang amount (minus)
15 Protrusion of elastic body for die (plus)
16 Slitter blade portion 17 Resin, elastic layer 18 Unsatisfactory portion 19 Burr, burrs W Work and traveling direction AA ′ Cross-sectional schematic view of punch roll BB ′ Cross-sectional schematic view of die roll C -C 'Dimensional accuracy measurement part during evaluation

Claims (8)

In a rotary cutter consisting of a combination of a punch roll and a die roll that rotates in opposite directions and punches the foil passing between both in a single step,
The punch roll has a punch having a substantially product-shaped convex portion on the roll, and the die roll has a die that is a concave portion having substantially the same shape corresponding to the punch shape,
Through the operation of punching the foil with the punch and die, the outermost periphery of the punch and die performs punching without interfering with each other,
A rotary cutter in which an elastic body for punching for assisting punching is attached to at least a part of the tip of the punch. The punch elastic body is any one of polypropylene, acrylic resin, polyethylene terephthalate, polycarbonate, bakelite, plastic, fluororesin, epoxy resin, polyurethane, polyvinyl chloride, polyamide, polyethylene, vinyl chloride, hard rubber, and synthetic fiber. Or the rotary cutter of Claim 1 which consists of 2 or more types of materials. The rotary cutter according to claim 1, wherein a height of the punch elastic body in a radial direction of the rotary cutter is 50 μm or more and 5 mm or less. The rotary cutter according to any one of claims 1 to 3, wherein a punch portion excluding the punch elastic body is made of a material having an elastic coefficient of 150 GPa or more. The rotary cutter according to any one of claims 1 to 4, wherein an elastic coefficient of a material of the die is 150 GPa or more. The rotary cutter according to any one of claims 1 to 5, wherein a die elastic body for assisting punching is attached to the concave portion of the die. The rotary cutter according to claim 6, wherein the die elastic body is made of at least one of rosin, natural rubber, synthetic rubber, natural sponge, synthetic sponge, rubber sponge, and foamed plastic. . The said elastic body for die | dye protrudes -2 mm or more and 3 mm or less on the basis of the operation | movement outermost periphery of the recessed part of the anvil roll except a die elastic body, Either of Claim 6 or Claim 7 characterized by the above-mentioned. The described rotary cutter.

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