JP2004237410A - Cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting device like a rotary cutter in which part of a cutting blade is made of a hard material such as cemented carbide, the hard material being unable to easily separate from a base. <P>SOLUTION: According to the structure of the cutting device, the cutting blade 6 is arranged on a peripheral surface 5 of a die roll 2, and the cutting blade 6 is formed by facing a first surface 11 to a second surface 12 at an angle θ. Then a hard film 14 formed of a cemented carbide spray deposit is arranged on the first surface 11, and a front end surface 14b of the hard film 14 is ground in a manner being flush with the second surface 12, whereby an angular portion 15 at the angle θ is formed so as to function as a cutting edge. The hard film 14 is a thin and flat film and therefore it is hardly separated from the cutting blade, to thereby facilitate grinding of the angular portion at the cutting edge. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutting device having a cutting edge formed of a hard material having a small amount of wear.
[0002]
[Prior art]
A rotary cutter having two rolls is used as a cutting device for cutting a fiber product formed of a nonwoven fabric or a laminate of a plurality of nonwoven fabrics or a laminate of a nonwoven fabric and a fiber bundle layer into a predetermined pattern.
[0003]
In this type of rotary cutter, a die roll and an anvil roll are provided such that their axial centers are parallel to each other. The die roll is provided with a cutting blade projecting radially from the outer peripheral surface thereof, and the die roll and the anvil roll rotate in a state where the cutting edge of the cutting blade is pressed against the outer peripheral surface of the anvil roll. When the work is supplied between the die roll and the anvil, the work is cut between the cutting blade of the die roll and the outer peripheral surface of the anvil roll.
[0004]
However, in the rotary cutter, since the cutting blade of the die roll and the outer peripheral surface of the anvil roll are always in pressure contact with each other, wear of the outer peripheral surfaces of the cutting blade and the anvil roll cannot be avoided. In addition, when focusing on wear, the cutting blade of the die roll is made of a harder material than the anvil roll, and the outer peripheral surface of the anvil roll is more easily worn than the cutting blade, thereby extending the life of the cutting blade. It is preferred in that respect.
[0005]
However, if the entire cutting blade of the die roll is formed of a hard material such as a super hard material, the manufacturing cost of the cutting blade increases, and it is difficult to grind the cutting edge when the cutting edge of the cutting blade is worn.
[0006]
In the following Patent Document 1, in the manufacturing process of an absorbent article such as a sanitary napkin or a disposable diaper, as a cutting device used for joining and cutting of a sheet material, a super-hard tip is formed on a ridge portion formed on a roll. An alloy is sprayed with a thickness of 0.1 to 10 mm, and a sprayed layer of the cemented carbide is ground to form a convex superhard portion for processing an absorbent article. .
[0007]
[Patent Document 1]
JP 2001-9866 A
[Problems to be solved by the invention]
Patent Document 1 discloses a technique of forming a triangular or trapezoidal convex superhard portion by grinding the entire sprayed layer formed by spraying a cemented carbide in a molten state, and a technology formed on a roll surface. A technique for uniformly forming the sprayed layer on the entire surface of the convex portion is disclosed.
[0009]
However, in order to form a triangular or trapezoidal convex carbide part by grinding the sprayed layer of the cemented carbide, it is necessary to increase the thickness of the sprayed layer. Adhesion with a roll, which is a material, is reduced, and if used for a long time, the sprayed film may be peeled off from the base material. In addition, when the convex superhard portion is worn out due to long-term use, it is necessary to perform thermal spraying of the cemented carbide again to perform a grinding process, and it is difficult to perform a restoring operation at the time of wear. Further, the sprayed layer sprayed with the cemented carbide is brittle as compared with the bulk material of the same cemented carbide, so that when the pressure applied to the surface of the anvil roll is too large, the structure is likely to be broken at the tip.
[0010]
In addition, in the case where the sprayed layer is uniformly formed on the entire surface of the convex portion formed on the roll surface, it is difficult to form a cutting edge having a sharp cutting edge angle with a cemented carbide, so that it is configured as a cutting blade. Have difficulty.
[0011]
An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a cutting device capable of forming a hard blade having a sharp blade angle by forming a hard film on a cutting blade.
[0012]
[Means for Solving the Problems]
The present invention relates to a cutting apparatus having a cutting blade for cutting a work, wherein the cutting blade has a first surface and a second surface that gradually approach a blade edge, and the first surface has a hard film. Are formed, and a corner between the film surface of the hard film and the end face on the cutting edge side of the hard film functions as a cutting edge.
[0013]
In this cutting device, the corner portion of the hard film can function as a cutting edge having a predetermined angle only by forming the hard film on the first surface of the cutting blade. Since it is not necessary to make the hard film extremely thick, the adhesion between the hard film and the first surface can be increased, and peeling of the hard film can be prevented.
[0014]
For example, in the present invention, the hard film is polished so that the end surface on the cutting edge side is flush with the second surface.
[0015]
When the cutting edge is worn, the cutting edge can be restored only by polishing the end surface of the hard film so as to be flush with the second surface.
[0016]
Further, the present invention can be configured such that the cutting blade has a concave portion located closer to the base side than the cutting edge, and the cutting edge is displaceable.
[0017]
When the cutting edge can be displaced in this way, it is possible to prevent the pressing force between the cutting edge and the anvil from becoming excessive, and it is easy to prevent tissue destruction of the cutting edge.
[0018]
Further, according to the present invention, the cutting blade has two first surfaces facing each other, and two second surfaces located between the first surface and the first surface. The hard film may be provided on each of the first surfaces, and the corner of each hard film may function as a cutting edge.
[0019]
In this cutting device, cutting can be performed in two directions by a cutting blade.
The hard film in the present invention is, for example, a sprayed film obtained by spraying a cemented carbide.
[0020]
Further, the present invention has a die roll and an anvil roll whose axial centers face in parallel, and the cutting blade is provided so as to protrude in a radial direction from an outer peripheral surface of the die roll, and the cutting blade and the anvil roll are provided. Can be configured as a rotary cutter for cutting a work between the outer cutter and the outer peripheral surface of the rotary cutter.
[0021]
However, the cutting device can be configured other than the rotary cutter.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a perspective view showing a rotary cutter as an embodiment of the cutting apparatus of the present invention, and FIG. 2 shows a state where a cutting blade of a die roll and an outer peripheral surface of an anvil roll face each other along a line II-II orthogonal to the axis. It is the fragmentary enlarged sectional view cut.
[0023]
In this rotary cutter 1, a die roll 2 and an anvil roll 3 are provided such that their axial centers O1 and O2 are parallel to each other. The die roll 2 has a rotating shaft 4 and an outer peripheral surface 5 formed with a predetermined radius from the axis center O1 of the rotating shaft 4, and a plurality of cutting blades 6 are radially extended from the outer peripheral surface 5. Are provided to protrude. On both sides of the die roll 2 in the axial direction, contact peripheral surfaces 7, 7 having a radius slightly larger than the outer peripheral surface 5 are formed, and the cutting edge of the cutting blade 6 is more radially than the contact peripheral surfaces 7, 7. Slightly projecting to On the other hand, the anvil roll 3 has a rotating shaft 8 and an outer peripheral surface 9 formed with a predetermined radius from the axial center O2 of the rotating shaft 8.
[0024]
The die roll 2 and the anvil roll 3 are pressed against each other, and the contact peripheral surfaces 7, 7 of the die roll 2 contact the outer peripheral surface 9 of the anvil roll 3 at a predetermined pressure, so that the axial center O1 of the die roll 2 and the anvil The center 3 of the roll 3 is maintained at a constant distance from the center O2, and the cutting blade 6 provided on the die roll 2 is pressed against the outer peripheral surface 9 of the anvil roll 3 with a predetermined pressure.
[0025]
When the work W is fed between the die roll 2 and the anvil roll 3 by rotating the die roll 2 and the anvil roll 3 in the direction of the arrow in synchronization with each other, the cutting edge of the cutting blade 6 of the die roll 2 and the anvil roll 3 The workpiece W is sandwiched between the outer peripheral surface 9 and the workpiece W, and the workpiece W is partially cut by the cutting blade 6.
[0026]
For example, the work W has a base sheet Wa formed of a nonwoven fabric or the like, and a fiber bundle layer Wb superposed on both surfaces of the base sheet Wa. The fiber bundle layer Wb is a bundle of continuous fibers that is continuously continuous in the feed direction (MD) of the work W. The fiber bundle layer Wb and the base sheet Wa are spaced at a certain interval in the feed direction (MD). They are joined by a heat-sealing line Wc extending continuously and linearly in a direction (CD) perpendicular to the feeding direction (MD). When the work W is supplied between the die roll 2 and the anvil roll 3, an intermediate portion between the heat fusion wires Wc and Wc is sandwiched between the cutting blade 6 and the outer peripheral surface 9, and The material sheet Wa and the fiber bundle layer Wb are cut together to form a cutting line Wd.
[0027]
The work W after the cutting step is such that, on both side surfaces of the base material sheet Wa, the fiber bundle layer Wb has the heat fusion wire Wc as a fixed end and a portion cut along the cutting line Wd becomes a free end. Is separated into The work W can be used as an article for cleaning such as floor wiping, and the fiber bundle layer Wb functions like a brush to exhibit a dust collecting effect.
[0028]
As shown in FIG. 2 in an enlarged manner, the cutting blade 6 is formed integrally with the main body of the die roll 2. Alternatively, the cutting blade 6 may be embedded and formed from the outer peripheral surface 5 of the die roll 2 toward the inside of the roll. The die roll 2 and the cutting blade 6 are formed of a steel material such as tool steel.
[0029]
The cross-sectional shape of the cutting blade 6 is triangular, and has a first surface 11 facing forward in the rotational direction of the die roll 2 and a second surface 12 facing backward in the rotational direction. The first surface 11 and the second surface 12 are both flat, and face each other at an angle θ such that the facing distance gradually decreases toward the cutting edge. The cutting blade 6 has a crossing corner portion 13 in which a first surface 11 and a second surface 12 face each other at the angle θ.
[0030]
The first surface 11 is formed with a hard film 14 attached thereto. A corner 15 where the film surface 14a of the hard film 14 intersects with the tip end surface 14b protrudes ahead of the cross corner 13. The corner 15 of the hard film 14 functions as a cutting edge. In this embodiment, the tip surface 14b of the hard film 14 is polished so as to be flush with the second surface 12, and the edge angle of the corner 15 is θ.
[0031]
The thickness of the hard film 14 is in the range of 0.1 to 0.6 mm, and more preferably 0.2 to 0.4 mm. Alternatively, the tip angle θ is 30 to 90 degrees.
[0032]
The hard film 14 can be formed of various hard materials. For example, the hard film 14 is a carbide of a high melting point metal, and is formed by melting a so-called cemented carbide containing tungsten (W), cobalt (Co), and carbon (C). And a sprayed film formed by spraying the first surface 11 of the cutting blade 6. The sprayed film of the cemented carbide is relatively thin, and has a substantially uniform film thickness on the first surface 11 so that the cutting blade 6 extends along the axial direction. When the sprayed film of the cemented carbide is thin, the adhesion to the first surface 11 which is the base material is good, and since the film is formed with a uniform film thickness on the first surface 11 which is a flat surface, the residual film in the film is formed. The stress is small, and film peeling due to residual stress hardly occurs.
[0033]
Alternatively, as the hard film 14, a sintered alloy obtained by adhering an alloy powder to the first surface 11 and sintering can be used. As the sintered alloy, for example, alumina titanium carbon (Al-Ti-Co) Can be exemplified. Alternatively, the hard film 14 may be a sputtered film formed by attaching diamond-like carbon (DLC) by sputtering or the like.
[0034]
In each of the cutting blades 6, a concave portion 6a is formed from the second surface 12 toward the inside of the cutting blade 6, and the cutting edge portion is elastically deformable in the α direction toward the rear in the rotational direction. ing. The remaining portion 6b between the deep end of the concave portion 6a and the first surface 11 is set so as not to overlap with the region where the hard film 14 is formed.
[0035]
The method of setting the shape of the cutting edge of each of the cutting blades 6, 6, ... provided on the die roll 2 will be described. After forming the hard film 14 on the first surface 11 of each of the cutting blades 6, The die roll 2 is rotated about the axial center O1 to polish the cutting edges of the respective cutting blades 11 so as to be positioned on the same circumferential surface. Next, in each cutting blade 6, the surface 14 a of the hard film 14 is polished so as to be parallel to the first surface 11, and the tip surface 14 b of the hard film 14 and the second surface 12 of the cutting blade 6 are further polished. Are polished so as to be on the same surface. Thereby, the corner portion 15 of the hard film 14 can be a cutting edge having the cutting edge angle θ.
[0036]
An example of a method of cutting a workpiece using the die roll 2 and the anvil roll 3 will be described.
[0037]
As shown in FIG. 1, the die roll 2 and the anvil roll 3 are rotated in opposite directions so that the contact peripheral surface 7 of the die roll 2 and the outer peripheral surface 9 of the anvil roll 3 have the same peripheral speed in synchronization with each other. Let me do. The work W is supplied between the outer peripheral surface 5 of the die roll 2 and the outer peripheral surface 9 of the anvil roll 3, and the work W is transported at the same peripheral speed.
[0038]
At this time, the base sheet Wa and the fiber bundle layer Wb, together with the heat-sealing line Wc of the work W and the heat-sealing line Wc, together with the corner 15 serving as a cutting edge and the outer peripheral surface 9 of the anvil roll 3 And the base sheet Wa and the fiber bundle layer Wb are pushed together.
[0039]
In the die roll 2, since the corner 15 serving as a cutting edge protrudes from the contact peripheral surface 7 by about several μm or about tens of μm, the corner 15 is always in pressure contact with the outer peripheral surface 9. However, since the corners 15 are made of a cemented carbide, the progress of wear can be slowed down. When a material harder than the outer peripheral surface 9 of the anvil roll 3 such as a cemented carbide is used as the hard film 14, the outer peripheral surface 9 is more easily worn than the corners 15. Since the outer peripheral surface 9 can be corrected by polishing the cylindrical surface around the axial center O2, the restoring process after abrasion can be facilitated.
[0040]
As described above, the corner 15 is always pressed against the outer peripheral surface 9. At this time, since the cutting blade 6 is elastically deformed at the remaining portion 6 b at the deep end of the recess 6 a, the corner 15 is excessively large. Pressure can be prevented from acting. Therefore, the possibility that the cemented carbide causes structural destruction at the corners 15 is reduced, and the life can be extended. Further, since the remaining portion 6b is formed so as not to overlap with the hard film 14, it is possible to prevent bending stress due to deformation of the remaining portion 6b from directly acting on the hard film 14 as much as possible. Film peeling due to bending stress can be easily prevented.
[0041]
When the cutting operation is continued and the sharpness of the workpiece W becomes poor, the second surface 12 of the cutting blade 6 and the tip surface of the hard film 14 are referred to. By grinding together with 14b, the corner 15 can be restored to the cutting edge angle θ. This polishing operation is easy because the second surface 12 is used as a reference, and the cutting edge angle of the corner portion 15 can always be set to θ by polishing.
[0042]
FIG. 3 is a sectional view showing a rotary cutter according to a second embodiment of the present invention.
The die roll 2A of the second embodiment has a cutting blade 6A embedded in the outer peripheral surface 5, and first surfaces 11A, 11A are formed on both the front and rear sides in the rotation direction of the cutting blade 6A. Have been. At the tip of the cutting blade 6A, a V-shaped recess is provided between the first surface 11A and the first surface 11A to form a second surface 12A and a second surface 12A. Hard films 14 and 14 are formed on both the first surface 11A and the first surface 11A, and a corner portion 15 of each hard film 14 where the film surface 14a and the tip surface 14b intersect is formed at a cutting edge angle θ. It has a cutting edge.
[0043]
In addition, a concave portion 6B is formed in parallel with the first surface 11A from the boundary between the second surface 12A and the second surface 12A, and the respective corners 15, 15 can be elastically displaced. I have. In this case, the concave portion 6B is formed deeply so that the deep end portion 6c of the concave portion 6B does not overlap the region where the hard films 14 are formed. The cutting blade is configured such that the corners 15, 15 can be displaced by deforming the vicinity of the back end 6c, but the back end 6c is located deeper than the hard film 14, 14 forming region. Since it is located on the side, bending stress is less likely to act on the hard films 14, 14 during the elastic deformation, and the structure is easy to prevent film peeling.
[0044]
In this die roll 2A, the center plane L between the first surface 11A and the first surface 11A does not coincide with the normal R of the outer peripheral surface 5 (line facing in the radial direction), and the center plane L is The cutting blade 6A is attached so as not to pass through the center O1.
[0045]
As a result, when the die roll 2A and the anvil roll 3 rotate, the trajectory A1 of one corner 15 hits the outer peripheral surface 9 of the anvil roll 3, and the corner 15 and the outer peripheral surface 9 are pressed against each other. The locus A2 of the corner 15 does not hit the outer peripheral surface 9. Therefore, only one corner 15 that rotates on the trajectory A1 exhibits a cutting function for the workpiece, and the other corner 15 does not exhibit the cutting function.
[0046]
When the corner 15 orbiting around the trajectory A1 is worn, the cutting edge angle θ can be recovered by polishing the tip end surface 14b of the hard film 14 with reference to the second surface 12A. However, when the wear becomes remarkable, the cutting blade 6A is mounted on the anvil roll 3 with the cutting blade 6A turned upside down in FIG. 3, and thereafter, the unworn corner 15 is rotated along the locus A1. It can be used as a cutting edge to continue cutting.
[0047]
In the embodiment shown in FIG. 3, the work can be always cut at the two corners 15 by aligning the center plane L with the normal line of the die roll 2A. The cutting operation can be performed regardless of the rotation direction.
[0048]
【The invention's effect】
As described above, in the present invention, the hardness of the cutting edge can be increased, and the hard film does not need to be excessively thick, so that peeling of the hard film hardly occurs.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a rotary cutter according to an embodiment of the present invention;
FIG. 2 is an enlarged cross-sectional view showing a state in which a cutting blade of a die roll and an outer peripheral surface of an anvil roll shown in FIG.
FIG. 3 is an enlarged sectional view showing a relationship between a cutting blade and an outer peripheral surface according to a second embodiment;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotary cutter 2, 2A Die roll 3 Anvil roll 4 Rotary shaft 5 Outer peripheral surface 6, 6A Cutting blade 6a, 6A Concave part 7 Contact peripheral surface 8 Rotary shaft 9 Outer peripheral surface 11, 11A First surface 12, 12A Second surface 14 Hard film 14a Film surface 14b Tip surface 15 Corner to be the cutting edge

Claims (6)

In a cutting device having a cutting blade for cutting a workpiece, the cutting blade has a first surface and a second surface gradually approaching toward a cutting edge, and a hard film is formed on the first surface. And a corner portion between a film surface of the hard film and an end surface of the hard film on a cutting edge side functions as a cutting edge. The cutting device according to claim 1, wherein an end surface of the hard film on a cutting edge side is polished so as to be flush with the second surface. The cutting device according to claim 1, wherein the cutting blade has a concave portion located closer to a base side than the cutting edge, and the cutting edge is displaceable. The cutting blade has two first surfaces facing each other, and two second surfaces located between the first surface and the first surface, and each of the two first surfaces has The cutting device according to any one of claims 1 to 3, wherein the hard film is provided on each of the hard films, and the corner portion of each hard film functions as a cutting edge. The cutting device according to claim 1, wherein the hard film is a sprayed film obtained by spraying a hard metal. An axial center has a die roll and an anvil roll facing each other in parallel, and the cutting blade is provided to protrude in a radial direction from an outer peripheral surface of the die roll, and is provided between the cutting blade and the outer peripheral surface of the anvil roll. The cutting device according to any one of claims 1 to 5, wherein the work is cut by the cutting.

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