JP6316055B2 - Rotary cutter and manufacturing method thereof - Google Patents

Description

The present invention relates to a rotary cutter for punching a sheet-like web by a punch roll having a convex punch portion formed on the outer peripheral surface of the roll and a die roll having a concave die hole on the outer peripheral surface of the roll. Is.

  A rotary cutter is generally used for the step of punching the same shape from a thin continuous workpiece (hereinafter also referred to as “web”). The rotary cutter rotates two rolls installed in parallel in opposite directions to cut a web passing between them. The two rolls have a pattern formed on at least one circumferential surface (hereinafter also referred to as a “flat surface”), and the pattern applies pressure to a portion where the two roll surfaces are close to each other. Disconnect.

Since the rotary cutter can feed and cut the web at the same time as compared with, for example, a vertically moving punching die, it can be operated at high speed. For this reason, it is suitable for punching the same shape in large quantities, such as punching diapers, sanitary products such as napkins, medical products such as masks, tapes, seals and films, etc. Yes.

  Rotary cutters are roughly divided into two cutting methods.

The first method is, for example, as shown in Patent Document 1, a “cutter roll” having a contoured convex pattern in which one roll is punched on the surface, and the other roll is an “anvil roll having a flat surface” The web passing between both rolls is cut according to the contour of the convex pattern by bringing only the convex pattern portion of the cutter roll into close proximity (or contact) with the anvil roll. When the convex pattern and the anvil roll come close to each other, a compressive stress is applied to the web, and the web is crushed according to the convex pattern by this stress and cut according to the contour. Various ideas have been made about the cutting edge of the convex portion as disclosed in Patent Document 2.

  In the second method, as shown in Patent Document 3 and Patent Document 4, one of the two rolls is a “punch roll” having a convex punch portion, and the other is a concave portion having an edge synchronized with the punch portion ( = Die roll) having a die part). As the roll rotates, stress concentrates on the edge of the punch roll and the edge of the die, and when both come close, the web in the portion sandwiched between them is punched out. This method does not crush and crush the web by compressive stress as in the above-described cutting by the “cutter roll” and “anvil roll”, but the web is mainly sheared like a vertically moving mold. Punch through. When punching, keep the outermost track of both rolls (the track on the outer periphery where the convex part is rotated and the track where the edge part of the die is rotated) does not intersect, that is, keep the punch tip and the die roll in contact. (As shown in FIG. 2, the die and the punch do not fit in any phase), and it is suitable to sandwich an intermediate such as a resin for assisting shearing simultaneously with the web.

In this method, each of the convex punch and the concave portion (die portion) must be provided on only one roll, and as shown in Patent Document 5, the concave portion of each roll corresponds to the edge of the convex portion. It only has to be.

In addition to Patent Documents 3 to 5, Patent Document 6 and Patent Document 7 are cited as examples in which the second method “punch roll” and “die roll” are used for a rotary cutter. These disclose a shear punching technique in which the tip end shape of the punch portion does not interfere with the concave portion of the die roll during rotation.

Japanese Patent Laid-Open No. 03-246000 JP 2007-136629 A International Publication No. WO2010 / 013818 JP 2012-055974 A JP, 2014-18867, A U.S. Pat. No. 4,273,015 European Patent Publication No. 2,042,279A1

Akira Hashimoto, “New work of press work and mold work”, 7th edition, Nikkan Kogyo Shimbun, April 30, 1975, p35

  As described above, a method using a rotary cutter is suitable for mass production of a punched web, and is actually used frequently.

  On the other hand, a rotary cutter is not practically used for punching a metal foil, an extremely thin resin material, a thin film, or a web in which an inorganic material is laminated thereon. For example, a battery sheet, an electronic component, etc. are typically mentioned.

  When cutting these webs, it is often required to have extremely strict shape accuracy and no burrs or burrs on the cut surface. Therefore, for these punching, quality is required even at the sacrifice of production speed, and a vertical mold is usually used. However, even in the case of an up-and-down mold, it is necessary to manufacture with a very small clearance between the punch and the die, for example, within 5 μm in order to suppress thin web burrs and burrs. It is expensive. The thinner these webs, the smaller the allowed clearance width. As shown in Non-Patent Document 1, since the “appropriate clearance upper limit of the mold is 5 to 10% of the plate thickness (web thickness)”, the mold becomes so thin that the web is thinned. The clearance needs to be narrowed.

  It is difficult to deal with such applications with the techniques disclosed in Patent Document 1 and Patent Document 2. The technique of the first method described in Patent Document 1 and Patent Document 2 is a method of “crushing” and cutting as described above. When the web is cut, this crushing process is performed, so that the metal is compressed and plastically deformed to generate burrs and burrs, and a crushed structure remains in the inorganic laminated portion. Further, even a thin resin material or film is not desirable because a crushed portion remains on the cut surface.

On the other hand, since the second method performs cutting with “shearing force” that shifts a part of the web in the thickness direction, it is possible to significantly reduce burrs and burrs on the cut surface.

  Therefore, the second method is suitable for punching a very thin metal foil, a resin material, a thin film, or a web in which an inorganic material is laminated thereon.

  However, the second method still has problems to be solved.

  As described above, in the second method, it is desirable to use an intermediate during cutting. The intermediate body passes between both rolls in a state of overlapping with the web, and helps to ensure a shearing force between the convex portion and the concave portion where the outer diameter line does not intersect. However, even though the intermediate is not a very expensive material such as a resin, it is basically required to have the same length as the web to be cut. It will go up. Therefore, a method that does not use an intermediate is more preferable if possible.

  The reason for using the intermediate is that the roll-shaped die and the rotational outermost diameter track 3 of the punch do not intersect (refer to FIG. 2), so that a sufficient shearing force cannot be secured for punching.

  If both rolls are manufactured so that the rotation outermost diameter track 3 intersects, it is necessary to strictly align the rotation. The alignment itself is originally necessary in the second method, but if the rotation is performed so that the outermost diameter wire 3 intersects, that is, the punch portion P and the concave portion (die D) are fitted, it is rotated. If the position is shifted, the punch portion P and the portion other than the concave portion (die D) of the die roll come into contact with each other, and the roll itself may be damaged, which is dangerous.

Moreover, when making it fit, it becomes very difficult to make the shape of the front-end | tip part of the punch part P. FIG. This is because the two rolls (PR, DR) are fitted together while rotating. As shown in FIG. 5, in the punch portion P extending straight and perpendicular to the surface of the roll PR, the corners and the surroundings of the punch D are This is because they interfere with the edge portion before fitting. The same size as the width W _D of the punch width W _P and the die holes in FIG. 5, is a schematic diagram of a parallel all die and punch lines marked in ▲, can not be clearly rolls rotate in this . Therefore, as shown in Patent Document 6, the shape of the tip of the punch P needs to be chamfered with a certain shape at the tip, and the height in the roll radial direction needs to be precisely matched. In order to cut off the burrs and burrs with the thin web W as described above, the clearance between the die and the punch needs to be several μm or less and within 10 μm at most. It is very expensive to manufacture a punch having a simple shape, precisely align the position in the roll radial direction, and precisely align the rotational position, and it is extremely difficult to increase the rotational speed.

The present invention provides a rotary cutter that punches out a thin web W satisfactorily without using an intermediate by the above-described second method, and more specifically, a convex portion (punch portion P) of a punch roll PR of the rotary cutter. It aims to manufacture.

The rotary cutter according to the present invention is
A rotary cutter that punches a sheet-like web by a punch roll having a convex punch portion formed on the outer peripheral surface of the roll and a die roll having a concave die hole on the outer peripheral surface of the roll,
The contour shape of the punch part and the contour shape of the die hole are substantially the same,
The convex punch is composed of a punch base part and a punch tip thin plate provided at the tip of the punch base part.
The punch tip thin plate is composed of a rotary cutter obtained by punching a thin plate with the punch base material and a die hole to solve the above-mentioned problems.

  According to the rotary cutter of the present invention, the clearance during rotation of the punch and the die can be set to about 0 to 10 μm, more preferably 5 μm or less, and a thin web made of metal or the like can be cut into burrs and burrs extremely small. Is possible.

Moreover, according to the manufacturing method of the rotary cutter of this invention, the rotary cutter with a very small clearance between a punch and a die can be manufactured at a relatively low cost. Furthermore, the replacement cost when the punch is worn can be extremely low.

Schematic diagram of web punching by rotary cutter of the present invention Explanatory drawing of rotation outermost circumference trajectory of punch and die Schematic diagram of the entire rotary cutter of the present invention Schematic diagram of punch and die fitting of rotary cutter of the present invention Schematic diagram with no clearance, punch protrusion and die lowering angle parallel Figure with thin plate attached to die substrate (1)-(3) Schematic diagram of punching of thin plate 6 Schematic diagram of the rotary cutter and punch part of the present invention (1)-(9) Schematic diagram when fitting punch D and die D of the present invention Schematic diagram of the punched web Schematic diagram of die unit

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a schematic view of the entire rotary cutter 1 of the present invention. Two rolls are installed in parallel and cut when the web W passes between them.

One of the two rolls is a punch roll PR having a convex punch portion P. The convex punch portion P is provided so as to protrude from a flat portion other than the unevenness of the roll.

  As shown in FIG. 4, the punch part P has a punch base part P1 and a punch tip thin plate P2.

  The punch base material portion P1 may be fixed to the flat end portion 4 by screwing or brazing, or may be manufactured by cutting from the same material as the flat portion 4.

  It is desirable that the punch base material portion P1 has a shape that protrudes from the flat portion 4 in the same manner as the shape in which the web W is to be punched, and the tip end surface has an edge.

Details of the punch tip thin plate P2 at the punch tip will be described later.

The die roll DR is a roll having a concave die hole D on the outer peripheral surface. The die hole D is a portion recessed from the flat end portion 4 of the roll, and the simplest manufacturing method is a method of cutting down at a right angle from the edge toward the center of the roll. The edge of the die hole D is also not chamfered, and a so-called “pin angle” state is desirable. The edge of the die hole D also has the same shape as the shape where the web W is to be punched out, like the punch.

  The punch roll PR and the die roll DR cut the web W sandwiched between the punch portion P and the edge of the die hole D in proximity to each other. The punch roll PR and the die roll DR cut the web at a location where the edges of the punch portion P and the die hole D face each other with the web W interposed therebetween. A schematic diagram at this time is shown in FIG. For this reason, it is necessary to match the punch roll PR and the die roll DR with respect to the rotation period (phase) of the roll. If the roll roll is greatly deviated, it is difficult to generate a shearing force appropriately, so that punching cannot be performed satisfactorily. Alternatively, the punch portion P and the die roll DR come into contact with each other and are damaged. In order to synchronize both rotation cycles, there are a method in which the punch roll and the die roll are synchronized by connecting the rotation with a gear, and a method in which a servo motor is provided on each rotation shaft to control the rotation phase. Any method other than these methods may be used as long as the punch roll and the die roll are synchronized. The rotation control member is shown at 100 in FIG.

In the position control of the punch portion P and the die hole D, the phase in the rotation direction of both edges is 10 μm or less, preferably 8 μm or less, more preferably 5 μm or less.

  Moreover, you may provide the web feed which is not shown in figure for conveyance of a web.

For other structures, a conventional rotary cutter method may be used.

Next, the punch tip thin plate P2 provided at the punch tip will be described.

  As shown in the schematic diagram of FIG. 2, the punch base material P1 and the die roll DR do not intersect with each other in their outermost rotation diameter (in the case of a punch roll, the locus of the punch base material P1 and the die roll is a flat surface). Even if it rotates by a phase, it has the structure where both do not contact.

  In this state, the thin plate 6 is fixed to the tip of the punch base P1. As an example, FIG. 6 shows a schematic diagram in which a square thin plate is fixed to the surface of the punch base P1. The fixing means may be a known means such as adhesion or brazing.

The thickness of the thin plate 6 is not particularly limited, but needs to be a thickness that can be punched by the punch base P1 and the die roll DR. Therefore, in reality, the thickness is about 5 to 500 μm. Further, the punch base P1 and the die roll DR do not intersect with the outermost rotating diameter 3 as described above, but the surface of the thin plate 6 and the die roll DR intersect with each other. Therefore, from this aspect, the condition that the thickness of the thin plate 6 is thicker than the shortest distance between the punch base P1 and the die roll DR is added.

As shown in FIGS. 7 (1) to (3), in a state where the thin plate 6 is fixed to the tip of the punch base P1, the thin plate 6 is first punched with the punch base P1 and the die roll DR. In this case, a thin intermediate such as a resin may be used between the thin plate 6 and the die roll DR. By punching, the thin plate 6 at the tip of the punch base P1 remains and other portions are separated, and thus removed as they are. In addition, the junction part 7 of the punch base material P1 and the thin plate 6 is omitted in other side views.

Thus, the thin plate 6 is provided at the tip of the punch base P1. Since this thin plate 6 has already been fitted into the die hole D, the thin plate 6 and the die hole are not shown if they are in a synchronized state in the roll circumferential direction (if the rotational phase is the same as when the thin plate is punched). As shown in FIG. 4, it is in a fitted state, but it does not make contact, or even if it makes contact, the surface is scratched. This thin plate 6 becomes the punch tip thin plate P2. Further, the punch “base material P1 + punch tip thin plate P2” becomes the punch P of the punch roll PR.

  FIG. 8 shows a detailed schematic diagram of the punch portion.

  First, the punch base P1 needs to have the same contour shape and edge shape as the die hole D first. However, since the punch base material P1 and the die hole D are not fitted and in contact with each other, it is not necessary to strictly match the shapes, for example, within a few μm. It is only necessary to have an edge shape similar to the edge of the die hole D within approximately 100 μm. With this accuracy, it can be shaped and processed at low cost with a general industrial processing machine without requiring special processing. The punch base P1 is formed on the punch roll PR.

  Next, the punch tip thin plate P2 will be described.

  As described above, the punch tip thin plate P2 is provided on the punch base P1. The punch base P1 and the punch tip thin plate P2 are integrated by means such as adhesive and brazing as shown in FIG. 6 before the punch tip thin plate P2 is punched and molded. In this state, it is formed by punching the thin plate 6 for the punch tip thin plate P2. As described above, the thickness of the thin plate 6 is larger than the shortest distance between the punch base P1 and the die hole D. Therefore, when the thin plate 6 is punched, the thin plate 6 enters the inside of the edge of the die hole D, and the thin plate 6 and the die hole D are in a fitted state. At this time, in order to engage with the die in the rotating state, the thin plate 6 is accurately punched in the dimension shape of the rotating die hole D. This shape is not a parallel line extending straight from the center of the roll as shown in FIG. 5, but is an arcuate shape when viewed from the side. 9 (1) to 9 (8) are schematic diagrams during rotation. Manufacturing this shape to an approximate shape with a processing machine such as a numerically controlled lathe or a machining center takes a great deal of calculation and processing time, and also requires a great deal of effort to position the roll with the die hole D in the rotational direction. . On the other hand, as described above, if the thin plate 6 is punched to form the punch tip thin plate P2, the punch tip thin plate P2 that fits into the rotating die hole D can be obtained very easily.

When the punch tip thin plate P2 is observed from the side surface, the tip becomes thinner than the portion joined to the punch base P1. This is different from the case where the joining portion 7 and the tip portion of the punch base material P1 are manufactured in the same shape, and does not contact the die even during the rotational movement of the roll. Will not spread. Therefore, an ideal shape can be obtained in which the clearance between the die hole D and the punch P is reduced to the limit. At this time, since the thin plate 6 is punched into a shape to be cut by fitting with the die, the shape of the punch base material P1 does not need to be exactly matched with the die hole D. For example, the same punch tip thin plate P2 can be obtained regardless of the size of the punch base material P1 when the outer contour is from a shape in which the die hole is about 100 μm larger to a shape smaller by 100 μm.

The phase shift in the rotation direction of the punch roll PR and the die roll DR is preferably within 10 μm, more preferably within 5 μm from the state in which the tip thin plate 6 at the punch tip is punched. When the thickness exceeds 10 μm, the punch thin plate P1 and the edge portion of the die hole D come into contact with each other, and any shape may be broken. If it is 10 μm or less, it may come in contact slightly, but the shape such as the edge will not be broken by contact.

  Although the material of the thin plate 6 depends on the material of the web W, it is more suitable to use stainless steel, copper, tool steel, hard plastic or the like. Since the punch tip thin plate P2 is in direct contact with the web W and applies a shearing force, wear occurs in the vicinity of the edge portion due to repeated use. Therefore, these materials that are resistant to wear are suitable. In addition, a material whose edge shape collapses during punching or a material that is difficult to punch is also not preferable. Therefore, a material that is harder than the material of the web W and softer than the material around the die hole D is most preferable for the reason described later.

If the punch tip thin plate P2 is worn and the cross-sectional quality of the punched web W cannot be maintained, the punch tip thin plate P2 may be peeled off from the punch base P1, and a new thin plate 6 may be joined and punched. That is, the replacement of the punch P is not costly and can be performed in a very short time as compared with the case of manufacturing a punch as in Patent Document 6.

The material of the punch base P1 may be any material that is less deformed when stress is applied and can punch through the punch tip member. Therefore, for example, an iron material with a low manufacturing cost is sufficient, and when a long-term specification is considered, a harder cemented carbide can be used. On the contrary, in order to always maintain the quality of the punch and minimize the wear of the die, it is also possible to use a material that is clearly lower in hardness than the die portion D and the punch base material P1 for the punch tip thin plate P2. . Although the life of the punch tip thin plate is shortened, it is possible to extremely reduce the risk of wear and chipping of the die D. Moreover, when the web W is a metal, there is no concern about adhesion with the web.

The material around the die hole D is preferably a material that hardly deforms in order to maintain a sharp edge necessary for punching the web W. Further, unlike the punch base material P1, when a shearing force is applied to the web W, it is a portion that is always subjected to stress, and thus is easily worn. Further, since it is not as easy to replace as the punch tip thin plate P2, it is preferable to use a material with as little wear as possible. Therefore, it is desirable to manufacture the periphery of the edge portion of the die hole D, at least several mm from the edge, with cemented carbide, tool steel, ceramics, etc., and further with a ceramic coating such as DLC (diamond-like carbon) or TiN. Also good. For wear, since it is used in a state where it is most likely to proceed among the punch base P1, the punch tip thin plate P2, and the die hole D, a material having higher hardness than the punch base P1 and the punch tip thin plate P2 is used. Is suitable.

Summarizing the hardness of each member described above, it is suitable to harden the material constituting the die hole D when the hardness is expressed in Rockwell hardness A scale (HRA). Since the punch tip thin plate P2 is subjected to the same stress as the material constituting the die hole, a material that is somewhat hard is desirable.
1. 1. It is necessary to punch through the punch base P1 and the die hole D. The punch tip thin plate P2 does not need to be as hard as the material constituting the die hole D because it is easy to replace, and if the material is too hard, it cannot be punched.

Further, the punch base P1 is not directly used for punching the web W, and it is sufficient if the punch thin plate P2 can be punched. Therefore, a material that is equal to or less rigid than the punch tip thin plate P2 can be selected. Therefore, the value of the material constituting the die hole D on the Rockwell hardness A scale is H _D (HR _A ), the punch base material P 1 is HP ₁ (HR _A ), and the punch tip thin plate P 2 is _{HP 2} (HR). _A ))
H _D > H _P2 ≧ H _P1
It is most desirable from the viewpoint of manufacturing cost and parts replacement.

In addition, when it is desired to maintain and manage punch quality by frequently replacing the punch tip member as described above, or when mass production over a long period is expected, the number of times of punching a thin plate by the punch base material P1 increases.
H _D ≧ H _P1 > H _P2
It is preferable to have the relationship.

For these relationships, an appropriate combination may be selected depending on the configuration of the production line, the material and shape of the web.

The web W to be punched is not only paper or paper-like material as described in Patent Document 6, for example, but a metal thin plate of about 5 to 100 μm, a thin resin, an inorganic sheet, or a coating agent for these. Good cutting quality can be obtained even with the web W coated with.

Example 1
(Formation of punch tip (punch tip thin plate))
Prepare a continuous belt-like copper foil with a thickness of 20 μm as a web, and prepare a die roll DR and a punch roll PR with a rotation control device 100 to punch out an L-shaped part W1 as shown in FIG. did.

The punch roll PR was made of hardened steel (SKD-11) at the roll body portion, and the pattern of the convex L-shaped punch portion P1 was made of the same material. The pattern of the L-shaped punch portion P1 has a shape whose outer periphery is about 20 μm larger than the shape in which the web W is to be punched. Further, the end surface of the punch base material P1 is finished by cylindrical processing of a roll, and an L-shaped convex portion is formed following the circumference.

The die roll DR has a roll body made of hardened steel (SKD-11), a part of which is removed by cutting, and a cemented carbide block 8 having an L-shaped depression as shown in FIG. Fixed to the die roll DR. The L-shaped recess had a depth of about 5 mm, and was a recess exactly the same as the shape W1 for punching the web.

These two rolls are attached to the rotation control unit 100 in parallel, and each roll end is subjected to rotation phase control and inter-roll distance control by a servo motor.

The state in which the outermost peripheral line 3 of the punch roll PR and the die roll DR does not intersect, that is, the punch base P1 of the punch roll PR does not come into contact with the flat surface of the die roll DR, and the gap is 5 μm.

  In this state, as shown in FIG. 6, a uniform stainless steel plate 6 having a thickness of 50 μm cut out in a square shape was attached to the tip of the punch base material with an adhesive. In this state, the punch P and the die hole D interfere with each other by about 35 μm in depth. The SKD11 and the stainless steel plate are harder than the SKD11.

  While the stainless steel plate 6 was adhered to the end face of the punch base D1, the rolls were rotated so that both edges of the punch base P1 and the die D were aligned while synchronizing the patterns of both rolls. As a result, the stainless steel plate 6 was punched out, and the bonded portion remained attached to the end surface of the punch base D1.

A stainless steel plate 6 is attached to the end surface of the punch base material P1, and the stainless steel plate 6 has a curved surface from the pasting portion to the side surface and forms the side surface to the edge. Further, the edge was sharp without being crushed.

(Web punching)
An aluminum foil web W having a thickness of 20 μm was inserted as a web W into a gap between both rolls, and both rolls were rotated.

  Both rolls control the phase in the rotational direction with a servo motor, and the deviation in the circumferential phase between the two rolls can be controlled to a maximum of about 5 μm for 100 rpm operation. At this time, the distance between the roll axes was kept as described above.

With rotation, the aluminum foil W was punched into an L shape, and the size thereof substantially matched the shape of the die hole D. The cut surface was in a good state with no noticeable burrs or burrs.

  The operation was continuously performed, the web supply was interrupted at the end of 5000 shots, and the punch part P was observed.

  Since the stainless steel punch thin plate was worn by several μm, it was peeled off from the bonded portion. Subsequently, an unused stainless steel plate 6 having the same thickness was attached to the punch base material portion as before, and the stainless steel plate 6 was punched out with the roll phase as it was to obtain a new punch tip thin plate P2. The exchanged punch thin plate P2 was able to cut the web with an excellent cut surface, similarly to the first punch tip thin plate.

Similarly, the periphery of the die hole D was also observed. However, since the hardness is higher than any of the copper foil W, the punch base material P1, and the punch tip thin plate P2, the amount of wear is small, and replacement is necessary. There was no need for.

(Example 2)
The other conditions were the same as in Example 1, and only the matters described below were changed.
(1) Change the material of the punch base material from hardened steel SKD11 to carbon steel S45C (2) Change the material of the thin plate from stainless steel to hardened steel SK material, change the thickness of the thin plate from 50μm to 100μm (3) Material of the web Is changed from a copper foil to a resin material (polypropylene material), and the thickness is changed from 20 μm to 5 μm. Note that the material of the die is not changed from cemented carbide, and the hardened steel SK is harder than the carbon steel S45C.

When the web was punched under these conditions, it was possible to obtain a cut cross section with almost no burrs or burrs and without any collapse of the structure. As for the life, some wear was observed at the time of punching out well in 10 million shots. Subsequently, an unused SK material plate having the same thickness was attached to the punch base material portion as before, and the SK plate was punched out with the roll phase as it was, to obtain a new punch tip thin plate P2. The time required for the replacement was about 20 minutes, and the punch thin plate P2 after the replacement was able to cut the resin material with an excellent cut surface, like the first punch tip thin plate. The replacement time was extremely short, and the replacement was possible without incurring costs.

DR Die roll D Die hole PR Punch roll P Punch P1 Punch base part P2 Punch tip (tip thin plate)
W _P punching unit width _{W D} die hole width 1 rotary cutter 3 rotation outermost orbit D of P (dotted line)
4 Flat end (surface) of the circumferential surface of the roll
5 Roll rotation direction (arrow)
6 Metal thin plate 7 Joint part 8 of P1 and P2 Die block 9 Advancing direction of web (arrow)
100 Rotation control unit W Web (thin plate-shaped material to be cut)
W1 Shape of the punched web

Claims (9)

A rotary cutter that punches a sheet-like web by a punch roll having a convex punch portion formed on the outer peripheral surface of the roll and a die roll having a concave die hole on the outer peripheral surface of the roll,
The contour shape of the punch part and the contour shape of the die hole are substantially the same,
The convex punch is composed of a punch base part and a punch tip thin plate provided at the tip of the punch base part.
The punch tip thin plate is a rotary cutter formed by punching a thin plate with the punch base material and a die hole.   The rotary cutter according to claim 1, wherein a thickness of the thin plate is larger than a shortest distance during rotation of the punch base and the die hole.   2. The rotary cutter according to claim 1, wherein a thickness of the thin plate is larger than a distance between the punch base and the die hole, and a thickness of the thin plate is 5 to 500 μm.   The rotary cutter according to any one of claims 1 to 3, wherein a material of the thin plate is selected from iron, stainless steel, hardened steel, copper, and hard plastic.   The rotary cutter according to any one of claims 1 to 4, wherein a clearance between the punch during rotation and the die is 10 µm or less. Rockwell hardness A scale of the punch base portion _H P1 _(HR A),
The Rockwell hardness A scale of the thin plate is _{HP 2} (HR _A ),
When the Rockwell hardness A scale of the material constituting the die is expressed as H _D (HR _A ),
H _D > H _P2 ≧ H _P1
The rotary cutter according to any one of claims 1 to 5, wherein the relationship is satisfied. Rockwell hardness A scale of the punch base portion _H P1 _(HR A),
The Rockwell hardness A scale of the thin plate is _{HP 2} (HR _A ),
When the Rockwell hardness A scale of the material constituting the die is expressed as H _D (HR _A ),
H _D ≧ H _P1 > H _P2
The rotary cutter according to any one of claims 1 to 5, wherein the relationship is satisfied. The member constituting the die hole is composed of a hard material block including the die hole portion,
The rotary cutter according to any one of claims 1 to 7, wherein the block is embedded and fixed in a die roll. A rotary cutter manufacturing method for processing a sheet-like workpiece with a punch roll having a convex punch portion formed on the outer peripheral surface of the roll and a die roll having a concave die hole on the outer peripheral surface of the roll, 1. The manufacturing method of the rotary cutter which has a process of -3.
Production method.
1. 1. A step of bonding a thin plate having a thickness of 5 to 100 μm to the end face of the convex punch base material that does not fit into the die hole. 2. adjusting the distance between the punch roll and the die roll so that the surfaces of the joined thin plates fit into the die holes; A process of removing punching waste by using the thin plate as a punching punch tip member by rotational movement of the punch roll and the die roll.

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