JP4324388B2 - Cutting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutting device having a cutting edge formed of a hard material with a small amount of wear.
[0002]
[Prior art]
A rotary cutter provided with two rolls is used as a cutting device for cutting a non-woven fabric or a laminate of a plurality of non-woven fabrics, or a fiber product made of a laminate of a nonwoven fabric and a fiber bundle layer into a predetermined pattern.
[0003]
In this type of rotary cutter, the die roll and the anvil roll are provided such that their axial centers are parallel to each other. The die roll is provided with a cutting blade protruding 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 in pressure contact with the outer peripheral surface of the anvil roll. When the workpiece is supplied between the die roll and the anvil, the workpiece is sandwiched between the die roll cutting blade and the outer peripheral surface of the anvil roll and cut.
[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, it is inevitable that the outer peripheral surface of the cutting blade and the anvil roll is worn. In addition, when focusing on wear, it is possible to extend the life of the cutting blade by making the cutting blade of the die roll harder than the anvil roll and making the outer peripheral surface of the anvil roll easier to wear than the cutting blade. This is preferable.
[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 the cutting operation of the cutting edge when the cutting edge of the cutting blade is worn is difficult.
[0006]
In Patent Document 1 below, in the manufacturing process of absorbent articles such as sanitary napkins and disposable diapers, as a cutting device used for joining and cutting sheet materials, a carbide is provided at the tip of a ridge formed on a roll. An alloy is sprayed with a thickness of 0.1 to 10 mm, and a sprayed layer of this cemented carbide is ground to form a convex cemented carbide portion for processing an absorbent article. .
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-9866
[Problems to be solved by the invention]
In Patent Document 1, the entire sprayed layer formed by spraying molten cemented carbide is ground to form a triangular or trapezoidal convex cemented carbide part, and formed on the 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 a cemented carbide sprayed layer, it is necessary to increase the thickness of the sprayed layer. Adhesiveness with a roll, which is a material, is reduced, and the sprayed film may be peeled off from the base material when used for a long time. In addition, when the convex cemented carbide part is worn out due to long-term use, it is necessary to thermally spray the cemented carbide again to perform grinding, and the restoration work at the time of wear is difficult. Further, since the sprayed layer sprayed with the cemented carbide is brittle compared with the bulk material of the same cemented carbide, if the pressure applied to the surface of the anvil roll is too large, the structure is liable to break down 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 cemented carbide, and it is configured as a cutting blade. Have difficulty.
[0011]
The present invention solves the above-described conventional problems, and an object of the present invention is to provide a cutting apparatus that can form a hard film having a sharp blade edge angle by forming a hard film on the cutting blade.
[0012]
[Means for Solving the Problems]
The present invention provides a cutting apparatus having a cutting blade for cutting a workpiece, wherein the cutting blade has a first surface and a second surface that gradually approach toward the blade tip, and a hard film is formed on the first surface. There are formed, the corners of the end surface of the tip side of the hard film of the film surface and the hard film is functioning as a cutting edge,
At the base side of the cutting edge, the concave portion from the surface toward the inside of the cutting blade is formed, the previous portion than the concave portion of the cutting blade is those characterized that you have been resiliently displaceable .
[0013]
In this cutting apparatus, only by forming a hard film on the first surface of the cutting blade, the corners of the hard film can function as a cutting edge having a predetermined angle. Since it is not necessary to make the hard film extremely thick, the adhesion between the hard film and the first surface can be improved, and the hard film can be prevented from peeling off.
[0014]
For example, in the present invention, the end face on the blade edge side of the hard film is polished so as to be flush with the second face.
[0015]
When the cutting edge is worn, the cutting edge can be restored by simply polishing the end face of the hard film so that it is flush with the second surface.
[0017]
Since the tip of the cutting blade can be elastically displaced, it is possible to prevent the pressure applied between the blade and the anvil from being excessive, and it is easy to prevent tissue destruction of the blade.
[0018]
Furthermore, the present invention provides a cutting apparatus having a cutting blade for cutting a workpiece, wherein the cutting blade is provided between a first surface formed on both the front and rear in the rotational direction and between the two first surfaces. Each of the two first surfaces has a hard film formed thereon, and each of the hard films has two hard surfaces formed by two second surfaces that are positioned and gradually approach toward the blade edge. The corner of the film surface of the hard film and the end face on the blade edge side of the hard film functions as a blade edge,
A recess is formed from the boundary between the two second surfaces toward the inside of the cutting blade, and the portions located on both sides of the recess are elastically displaceable.
[0019]
In this cutting apparatus, cutting can be performed in two directions by a cutting blade.
The hard film in the present invention is a sprayed film obtained by spraying a cemented carbide, for example.
[0020]
Further, the present invention includes a die roll and an anvil roll whose axial centers are parallel to each other, and the cutting blade is provided to project radially from an outer peripheral surface of the die roll, and the cutting blade and the anvil roll It can comprise as a rotary cutter by which a workpiece | work is cut | disconnected between the outer peripheral surfaces.
[0021]
However, this cutting device can be configured other than the rotary cutter.
[0022]
DETAILED DESCRIPTION OF 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 is a diagram showing the opposed state of the cutting blade of the die roll and the outer peripheral surface of the anvil roll, taken along line II-II perpendicular to the axis center. It is the partial expanded sectional view cut | disconnected.
[0023]
In this rotary cutter 1, a die roll 2 and an anvil roll 3 are provided such that axial centers O1 and O2 thereof 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 axial center O1 of the rotating shaft 4, and a plurality of cutting blades 6 extend radially from the outer peripheral surface 5. Is provided protruding. On both sides of the die roll 2 in the axial direction, contact peripheral surfaces 7 and 7 having a slightly larger radius than the outer peripheral surface 5 are formed, and the cutting edge of the cutting blade 6 is more radial than the contact peripheral surfaces 7 and 7. Project slightly. 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 of the die roll 2 abut against the outer peripheral surface 9 of the anvil roll 3 with a predetermined pressure, so that the axial center O1 of the die roll 2 and the anvil The axial center O2 of the roll 3 is maintained at a constant interval, and the cutting blade 6 provided on the die roll 2 and the outer peripheral surface 9 of the anvil roll 3 are pressed against each other with a predetermined pressure.
[0025]
When the die roll 2 and the anvil roll 3 are driven to rotate in the direction of the arrow in synchronization with each other and the workpiece W is fed between the die roll 2 and the anvil roll 3, the cutting edge 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 is partially cut by the cutting blade 6.
[0026]
For example, the workpiece W includes a base sheet Wa formed of a nonwoven fabric or the like, and a fiber bundle layer Wb stacked on both surfaces of the base sheet Wa. The fiber bundle layer Wb is a bundle of continuous fibers that are continuously continuous toward the feed direction (MD) of the workpiece W, and the fiber bundle layer Wb and the base sheet Wa have a constant interval in the feed direction (MD). Joined by a heat-sealing line Wc extending in a continuous straight line toward the direction (CD) perpendicular to the feed direction (MD). When the workpiece W is supplied between the die roll 2 and the anvil roll 3, an intermediate portion between the heat-sealing wires Wc and Wc is sandwiched between the cutting blade 6 and the outer peripheral surface 9, and the base The material sheet Wa and the fiber bundle layer Wb are cut together to form a cutting line Wd.
[0027]
The workpiece W after passing through the cutting step is such that the fiber bundle layer Wb is a free end at the both sides of the base sheet Wa where the fiber fusion layer Wb is cut at the cutting line Wd with the heat-sealing line Wc as a fixed end. Separated. The workpiece W can be used as a cleaning article such as a floor wipe, and the fiber bundle layer Wb functions like a brush and can exhibit a dust collecting effect.
[0028]
As shown in an enlarged view in FIG. 2, the cutting blade 6 is formed integrally with the main body of the die roll 2. Alternatively, the cutting blade 6 may be formed by being embedded 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 made of a steel material such as tool steel.
[0029]
The cross-sectional shape of the cutting blade 6 is a triangle, 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 are opposed to each other with an angle θ so that the facing distance gradually decreases toward the cutting edge. The cutting blade 6 has a crossing corner portion 13 where the first surface 11 and the second surface 12 face each other at the angle θ.
[0030]
A hard film 14 is attached to the first surface 11. The corner portion 15 where the film surface 14 a and the tip end surface 14 b of the hard film 14 intersect protrudes ahead of the intersection corner portion 13. And the corner | angular part 15 of the said hard film | membrane 14 functions as a blade edge | tip. In this embodiment, the front end 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 film thickness of the hard film 14 is in the range of 0.1 to 0.6 mm, more preferably 0.2 to 0.4 mm. The blade edge 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 a so-called cemented carbide containing tungsten (W), cobalt (Co), and carbon (C) is melted. A sprayed coating formed by spraying on the first surface 11 of the cutting blade 6. The cemented carbide sprayed film is relatively thin and is formed with a substantially uniform film thickness on the first surface 11 so that the cutting blade 6 extends along the axial direction. If the sprayed coating of the cemented carbide is thin, the adhesion to the first surface 11 that is the base material is good, and the first surface 11 that is a flat surface is formed with a uniform film thickness. There is little stress, and film peeling due to residual stress hardly occurs.
[0033]
Alternatively, as the hard film 14, a sintered alloy obtained by attaching an alloy powder to the first surface 11 and sintering can be used. As this sintered alloy, for example, alumina titanium carbon (Al—Ti— C ) or the like can be used. Can be illustrated. Alternatively, the hard film 14 may be a sputtered film formed by depositing diamond-like carbon (DLC) by sputtering or the like.
[0034]
In each cutting blade 6, a recess 6 a is formed from the second surface 12 toward the inside of the cutting blade 6, and the blade tip portion can be elastically deformed in the α direction toward the rear in the rotation direction. ing. The remaining portion 6b between the back end of the recess 6a and the first surface 11 is set so as not to overlap the region where the hard film 14 is formed.
[0035]
When the processing method of the shape setting of the blade edge | tip of each cutting blade 6,6 ... provided in the said die roll 2 is demonstrated, after forming the hard film 14 in the 1st surface 11 of each said cutting blade 6, The die roll 2 is rotated about the axis center O1, and the cutting edge of each cutting blade 11 is polished so as to be positioned on the same circumferential surface. Next, in each of the cutting blades 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 polished on the same surface. Thereby, the corner | angular part 15 of the hard film | membrane 14 can be made into the blade edge | tip which has the blade edge | edge angle (theta).
[0036]
An example of a workpiece cutting method 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. Be made. The workpiece W is supplied between the outer circumferential surface 5 of the die roll 2 and the outer circumferential surface 9 of the anvil roll 3, and the workpiece W is conveyed at the same speed as the circumferential speed.
[0038]
At this time, in the middle of the heat-sealing line Wc and the heat-sealing line Wc of the workpiece W, the base sheet Wa and the fiber bundle layer Wb together are the corner 15 serving as the 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, the corner 15 serving as the cutting edge protrudes from the contact peripheral surface 7 by about several μm or about several tens of μm, so that the corner 15 is always in pressure contact with the outer peripheral surface 9. However, since the corner portion 15 is made of a cemented carbide, the progress of wear can be slowed. When the hard film 14 is harder than the outer peripheral surface 9 of the anvil roll 3 such as a cemented carbide, the outer peripheral surface 9 is more easily worn than the corner portion 15. Since the outer peripheral surface 9 can be corrected by polishing the cylindrical surface around the axial center O2, the restoration process after wear can be facilitated.
[0040]
As described above, the corner 15 is always in pressure contact with the outer peripheral surface 9, but at this time, the cutting blade 6 is elastically deformed at the remaining portion 6 b at the back end of the recess 6 a, so that the corner 15 is excessively large. Pressure can be prevented from acting. Therefore, the possibility that the cemented carbide will cause a structure breakage at the corner 15 is reduced, and the life can be extended. Further, since the remaining portion 6b is formed so as not to overlap the hard film 14, it is possible to prevent the bending stress caused by the deformation of the remaining portion 6b from acting directly on the hard film 14 as much as possible. It becomes easy to prevent film peeling due to bending stress.
[0041]
Further, when the cutting operation is continued and the sharpness of the workpiece W is deteriorated, the second surface 12 and the distal end surface of the hard film 14 are used with the second surface 12 of the cutting blade 6 as a reference. By polishing 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 cross-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 the first surfaces 11A and 11A are formed on both the front and rear in the rotational direction of the cutting blade 6A. Has 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 the corner 15 of each hard film 14 where the film surface 14a and the tip surface 14b cross each other has a cutting edge angle θ. It has become a cutting edge.
[0043]
In addition, a recess 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 and 15 can be elastically displaced. Yes. In this case, the recess 6B is deeply formed in the back end 6c of the recess 6B so as not to overlap the region where the hard films 14 and 14 are formed. The cutting blade is configured such that each corner 15, 15 can be displaced by the deformation of the vicinity of the back end 6 c, but the back end 6 c is deeper than the formation region of the hard films 14, 14. Since it is located on the side, bending stress is unlikely 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 line R (line in the radial direction) of the outer peripheral surface 5, and the center plane L is The cutting blade 6A is attached so that it does not pass through the center O1.
[0045]
As a result, when the die roll 2A and the anvil roll 3 rotate, the locus 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 rotating on the locus A1 exhibits a cutting function for the workpiece, and the other corner 15 does not exhibit a cutting function.
[0046]
When the corner 15 rotating around the locus A1 is worn, the edge angle θ can be recovered by polishing the front end surface 14b of the hard film 14 with the second surface 12A as a reference. However, when this wear becomes noticeable, the cutting blade 6A is turned upside down in FIG. 3 and attached to the anvil roll 3, so that the corner portion 15 that is not worn thereafter 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, it is possible to always cut the workpiece at the two corners 15 and 15 by matching 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 it is not necessary to make the hard film excessively thick, so that the hard film is hardly peeled off.
[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 facing state between the cutting blade of the die roll and the outer peripheral surface of the anvil roll shown in FIG. 1 in a cross section orthogonal to the axial center;
FIG. 3 is an enlarged cross-sectional view showing the relationship between the cutting blade and the outer peripheral surface of the second embodiment;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotary cutter 2, 2A Die roll 3 Anvil roll 4 Rotating shaft 5 Outer peripheral surface 6, 6A Cutting blade 6a, 6B recessed part 7 Contact peripheral surface 8 Rotating shaft 9 Outer peripheral surface 11, 11A 1st surface 12, 12A 2nd surface 14 Hard film 14a Film surface 14b Tip surface 15 Corner portion to be a cutting edge

Claims (7)

In the cutting device having a cutting blade for cutting the workpiece, the cutting blade has a first surface and a second surface which gradually approach toward the cutting edge, the hard film is formed on the first surface In addition, the corners of the film surface of the hard film and the end face on the blade edge side of the hard film function as a blade edge ,
At the base side of the cutting edge, the concave portion from the surface toward the inside of the cutting blade is formed, the cutting device the recess former part than of the cutting blade is characterized that you have been resiliently displaceable. The cutting device according to claim 1, wherein the recess is formed on a base side with respect to the hard film. In the cutting apparatus having a cutting blade for cutting a workpiece, the cutting blade is positioned between the first surface formed on both the front and rear in the rotational direction and the two first surfaces, and directed toward the blade edge. Each of the two first surfaces, and a hard film is formed on each of the two first surfaces, and the film surface of each of the hard films and the The corner with the end face of the hard film on the cutting edge side functions as the cutting edge,
A cutting device, wherein a concave portion is formed from a boundary portion between the two second surfaces toward the inside of the cutting blade, and portions located on both sides of the concave portion can be elastically displaced. The cutting apparatus according to claim 3, wherein a deep end portion of the concave portion is formed deeply to a position not overlapping with a region where the hard film is formed. The cutting device according to any one of claims 1 to 4 , wherein an end surface of the hard film on a blade edge side is polished so as to be flush with the second surface. The hard film, the cutting device according to any one of claims 1 to 5, which is a sprayed film was sprayed hard metal. There are a die roll and an anvil roll whose axial centers are parallel to each other, and the cutting blade is provided to project radially from the outer peripheral surface of the die roll, and between the cutting blade and the outer peripheral surface of the anvil roll. in cutting device according to any one of claims 1 workpiece is cut 6.

Images