JP2000117699A - Rotary die cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain excellent clipping while avoiding defective cutting, edge tip chipping and the peeling of the outer peripheral surface of an anvil. SOLUTION: A die 11, which is rotated around its axis, is made of hard material such as cemented carbide and ceramics. The edge tip of the edge die formed in the outer peripheral face 11A of the die 11 is set in flush with the outer peripheral face of the large diameter section 11a having a large diameter than the outer peripheral face 11A of the die 11 or protruded specified length. The projection quantity L of this edge tip is set in the range of 0-4 μm (more preferably 1 μm-3 μm). In addition, both of the surface roughness of the outer diameter face 18 of the edge tip and the outer peripheral face of the anvil are set to 0.4 μm or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary die cutter for cutting a workpiece by a blade die and an anvil formed on the outer peripheral surface of a rotating die. The present invention relates to a technique suitable for a rotary die cutter made of a hard material.

[0002]

2. Description of the Related Art FIG. 5 is a front view showing a conventional example of a die 1 and an anvil 2 which are main components of a rotary die cutter of this kind. As shown in FIG. 1, in this rotary die cutter, a die 1 and an anvil 2 each having a substantially cylindrical shape in appearance are arranged such that respective axes A1 and A2 are parallel to each other.

At both ends of the die 1 and the anvil 2, shafts 3 and 4 are integrally formed so as to extend along the axes A1 and A2 of the die 1 and the anvil 2, respectively. Are supported by the cutter unit via a bearing box (not shown) (see the fulcrum 5).

[0004] The die 1 and the anvil 2 are respectively driven to rotate around the axes A1 and A2 in the opposite directions as indicated by arrows X and Y, respectively, by rotary driving means (not shown) through the respective shafts 3 and 4. Be moved. A cutting die (cutting blade) 6 is formed on the outer peripheral surface of the die 1 so as to have a rectangular appearance, and a portion surrounded by the cutting die 6 is a concave portion 7.

[0005] At both ends of the die 1, bearer portions 1 a formed to have a diameter larger than the outer peripheral surface of the die 1 are attached to the anvil 2.
The work is sandwiched between the die 1 and the anvil 2 while rotating the die 1 and the anvil 2 by the rotation driving means, so that the work is cut by the cutting die 6 of the die 1 and the outer peripheral surface of the anvil 2. Cut along the shape of 6.

[0006]

In the rotary die cutter having such a configuration, when the die 1 is new, the cutting edge 6a of the cutting die 6 is several micrometers smaller than the bearer portion 1a of the die 1.
Although it protrudes, the blade mold 6 gradually wears with the elapse of the operation time, so that the sharpness is reduced and the cutting edge 6a
The wear may progress until it is located more inward than the bearer part 1a, and the workpiece may not be cut.

In order to prevent this, the die 1 may be pressed against the anvil 2 with a larger force so that the cutting edge 6a protrudes from the bearer portion 1a. That is, conventionally, since the die 1 was made of steel having a low Young's modulus,
When the die 1 is pressed, the bearer portion 1a is elastically deformed in the radial direction, so that the cutting edge 6a can protrude from the bearer portion 1a, and is worn until the cutting edge 6a is positioned about 5 μm radially inward of the bearer portion 1a. However, good sharpness could be maintained.

Conversely, even if the cutting edge 6a protrudes about 20 μm in the radial direction from the bearer portion 1a, it is possible to avoid a situation in which the cutting edge 6a is chipped due to the high toughness and cannot be cut. However, the steel die 1 has the above advantages, but has a low Young's modulus, so that it bends in a curved shape during processing as shown by the dashed line B in FIG. There was a problem that it could not be performed.

Therefore, as a countermeasure, the die 1 is made of a hard material such as cemented carbide or ceramic so as to increase its rigidity in order to suppress the bending and maintain an effective pinching. Conceivable. According to such a configuration, the sharpness can be increased in addition to the prevention of bending, but since the die 1 is a high Young's modulus and brittle material, the following problems occur.

That is, even if the die 1 is pressed against the anvil 2 so that the cutting edge 6a protrudes from the bearer portion 1a in accordance with the progress of the blade die wear, the die 1 has a high Young's modulus, The amount of elastic deformation of 1a is reduced, and cutting failure (decrease in sharpness) occurs earlier than in the case of steel.

If the cutting edge 6a protrudes too far in the radial direction from the bearer portion 1a, chipping occurs on the cutting edge 6a due to the brittle material, so that the cutting edge cannot be cut off. There is a possibility that the cutting edge 6a may be strongly pressed against the anvil 2 to cause the surface of the anvil 2 to peel off.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a good cutting method while avoiding poor cutting due to bending of a die, chipping of a cutting edge, and surface peeling of an outer peripheral surface of an anvil. An object of the present invention is to provide a rotary die cutter capable of continuously performing pinching and cutting.

[0013]

In order to solve the above-mentioned problems and to achieve the above object, according to the present invention, a substantially cylindrical die and an anvil have a larger diameter than an outer peripheral surface of the die. The enlarged diameter portion is rotatably supported around axes parallel to each other in a state where the enlarged diameter portion is in contact with the outer peripheral surface of the anvil, and is covered between the blade mold formed on the outer peripheral surface of the die and the outer peripheral surface of the anvil. In a rotary die cutter for sandwiching and cutting a workpiece, the die is made of a hard material, and the cutting edge of the blade die formed on the outer peripheral surface is flush with the outer peripheral surface of the enlarged diameter portion or at a predetermined length. It is characterized by protruding radially outward.

As the hard material, for example, a cemented carbide or ceramics is used. In such a configuration, since the die is configured to have high rigidity, even if the die is strongly pressed against the anvil to protrude the cutting edge from the enlarged diameter portion of the die, the center of the die is radially outward from the axis. Deflection that occurs so as to be separated is suppressed, and effective pinching and cutting can be maintained.

Further, when the die is configured to have high rigidity,
Although the amount of elastic deformation of the enlarged diameter portion generated when the die is pressed against the anvil is reduced, in the present invention, since the outer diameter of the cutting edge is set at least flush with the outer peripheral surface of the enlarged diameter portion, the blade Cutting failure due to the progress of mold wear does not occur early.

Furthermore, if the cutting edge protrudes too far from the enlarged diameter portion despite the fact that the bending of the die is suppressed,
Chipping may occur at the cutting edge, or surface peeling may occur on the outer peripheral surface of the anvil.In the present invention, the outer diameter surface of the cutting edge is radially outward by a predetermined length from the outer peripheral surface of the enlarged diameter portion. However, there is no such fear because only the projection is made.

In order to effectively prevent the above-described early arrival of cutting failure, chipping of the cutting edge, and surface peeling of the outer peripheral surface of the anvil, the amount of convexity of the cutting edge from the outer peripheral surface of the enlarged diameter portion is set to 0.
It is desirable to set the range to 4 μm, more preferably 1 μm to 3 μm.

Further, it is desirable that both the surface roughness of the outer peripheral surface of the cutting edge and the surface roughness of the outer peripheral surface of the anvil are set to 0.4 μm or less. With such a configuration, the effect of setting the outer diameter difference between the cutting edge and the outer peripheral surface of the enlarged diameter portion in the above range can be further enhanced.

[0019]

Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, in this embodiment, a substantially cylindrical die 11 and an anvil 1 are formed.
2 and the outer peripheral surface 11A of the die 11
A bearer portion (larger diameter portion) 11a having a larger diameter than that is brought into contact with the outer peripheral surface 12A of the anvil 12, and the respective axes A1, A2 are supported in parallel with each other.

The shaft portions 13 and 14 extending from both ends of the die 11 and the anvil 12 along the axes A1 and A2 are rotatably supported by bearing boxes (not shown) and are driven by a driving device (not shown). As a result, the die 11 and the anvil 12 are driven to rotate in the directions of the arrows X and Y, respectively.

When the die 11 is pressed against the anvil 12, the bearing 11a abuts on the outer peripheral surface 12A of the anvil 12, so that the relative distance between the outer peripheral surface 12A of the anvil 12 and the cutting edge does not shrink below a certain value. Regulated as
It serves to protect a cutting blade described later from chipping or the like.

The die 11 of the present embodiment is made of a hard material typified by a hard metal, a ceramic, or the like.
A cutting blade 15 protruding in the radial direction is provided on the outer peripheral surface 11A.
A pair of blades 16 extending in parallel with each other and at right angles to each other in the direction of the axis A1 and the rotation direction of the die 11 form a rectangular window frame. The inner portion of the blade mold 16 is a recess 17 which is recessed one step toward the radially inner side of the axis A1 with respect to the outer peripheral surface 11A. On the other hand, the anvil 12 is made of steel or a hard material similar to the die 11.

FIG. 2 shows the cutting blade 1 at a portion 16A of the blade die 16 formed in a rectangular shape and extending in the rotation direction X.
5 is a sectional view taken along a plane including the axis A1, that is, a sectional view orthogonal to the direction in which the cutting blade 15 extends. As shown in this figure, the cutting blade 15 is formed in a mountain shape whose cross section gradually becomes narrower as it goes away from the outer peripheral surface 11 </ b> A of the die 11.

A flat outer diameter surface 18 is formed at the cutting edge of the cutting blade 15 so that the tip of the cutting blade 15 is cut off with a cylindrical surface centered on the axis A1. 4 μm
It is as follows. Here, the surface roughness refers to the maximum amplitude roughness.

The outer diameter surface 18 is formed to be flush with the outer peripheral surface of the bearer portion 11a or to project radially outward by a predetermined length. That is, the amount of protrusion L of the cutting edge from the outer peripheral surface of the bearer portion (see FIG. 2) is set in a range of 0 to 4 μm (more preferably, 1 to 3 μm).

In the rotary die cutter constructed as described above, the workpiece S is fed between the die 11 and the anvil 12 along the tangential direction P of the rotation directions X and Y, so that the cutting edge 15 is formed. The workpiece S is sandwiched between the cutting edge and the outer peripheral surface 12A of the anvil 12,
A frame-shaped portion having the same shape as the blade 16 is cut from the workpiece S.

The workpiece S cut in this manner is applied to the tangential direction P of the die 11 and the anvil 12.
It is wound around a suction roll (not shown) adjacent to the side, whereby the inside of the cut frame-shaped portion is pulled out, and the remaining portion is sent to the next step for processing.

However, in the rotary die cutter of the present embodiment, the die 11 is made of a hard material such as a cemented carbide or ceramics and has high rigidity. Therefore, even if the die 11 is strongly pressed against the anvil 12, the bending that occurs so that the central portion of the die 11 is separated radially outward from the axis A1 is suppressed, and effective pinching and cutting can be maintained.

Further, when the die 11 is configured to have high rigidity, the rotary die cutter according to the present embodiment is formed despite the fact that the amount of elastic deformation of the bearer portion 11a generated when the die 11 is pressed against the anvil 12 is reduced. In
Since the outer diameter surface of the cutting edge is set to be at least flush with the outer peripheral surface of the bearer portion 11a, cutting failure due to the progress of blade die wear does not occur early.

Furthermore, despite the fact that the die 11 is configured to have high rigidity to suppress its bending, in the rotary die cutter of the present embodiment, the outer diameter surface of the cutting edge is set to the outer periphery of the bearer portion 11a. Since it is set so that only 4 μm protrudes radially outward at most from the surface,
The cutting edge protruding radially outward from the bearer portion 11a is strongly pressed against the outer peripheral surface 12A of the anvil 12, and there is no danger that the cutting edge will be chipped or that the outer peripheral surface 12A of the anvil 12 will have surface peeling.

In addition, the outer surface 18 of the tip of the cutting blade and the outer surface 12A of the anvil 12 both have a surface roughness of 0.4 μm.
m or less, the difference in outer diameter between the cutting edge and the outer peripheral surface of the bearer portion 11a is set in the above range, thereby preventing early arrival of cutting failure, prevention of chipping of the cutting edge, and outer periphery of the anvil. The effect of preventing surface peeling of the surface can be further enhanced.

Therefore, according to the rotary die cutter of the present embodiment, it is possible to avoid the cutting failure due to the bending of the die 11, and it is possible to perform the good sandwiching of the workpiece S for a long time, Chipping of the cutting edge and surface peeling of the outer peripheral surface of the anvil can be avoided, and the life can be extended.

FIGS. 3 and 4 show a rotary die cutter according to the present embodiment having a cemented carbide die 11 and a conventional rotary die cutter having a steel die 11, respectively. This is an experimental result when a workpiece S having a thickness of 3 mm is cut with a material of non-woven fabric, pulp, fiber, or film using the amount L (horizontal axis) as a parameter. The number of cut pieces of the workpiece S is shown.

From these figures, according to the rotary die cutter of the present embodiment in which the die 11 is made of cemented carbide, the number of cuts is smaller than that of the conventional rotary die cutter in which the die 11 is made of steel. It can be understood that the edge protrusion amount L capable of exhibiting the effect of such a dramatic increase exists within a very limited narrow range while the dramatic increase can be achieved. And it became clear that the range is most effective when the blade edge protrusion amount L is 1 μm to 3 μm.

[0035]

As described above, according to the rotary die cutter of the present invention, by forming the die from a hard material, the bending of the die can be suppressed, and the effective pinching and cutting can be maintained for a long time. be able to. Also, by setting the amount of blade edge protrusion from the outer peripheral surface of the enlarged diameter portion within a predetermined range,
In addition to the early arrival of cutting failure, chipping of the cutting edge and surface peeling of the outer peripheral surface of the anvil can be effectively prevented, and the life can be extended. In addition, these effects
By setting the surface roughness of the cutting edge and the outer peripheral surface of the anvil within a predetermined range, it can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a rotary die cutter according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a diagram showing the number of cuts when a workpiece is cut using a rotary die cutter according to an embodiment of the present invention, using the amount of protrusion of the cutting edge from the outer peripheral surface of the enlarged diameter portion as a parameter.

FIG. 4 is a diagram showing the number of cuts when a workpiece is cut using a conventional rotary die cutter, using a blade edge convex amount from the outer peripheral surface of the enlarged diameter portion as a parameter.

FIG. 5 is a front view showing a main part of a conventional rotary die cutter.

[Explanation of symbols]

 Reference Signs List 11 die 11a enlarged diameter portion 11A outer peripheral surface of die 11 12 anvil 12A outer peripheral surface of anvil 12 16 blade type 18 outer diameter surface of blade edge L convexity of A1 axis of die 11 A2 axis of anvil 12 S workpiece

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C060 AA20 AB01 BA03 BB05 BB19 BB20 BD03 4E050 JA03 JD07

Claims (3)

[Claims] 1. A substantially cylindrical die and an anvil are rotated about axes parallel to each other in a state where an enlarged portion having a diameter larger than the outer peripheral surface of the die is in contact with the outer peripheral surface of the anvil. A rotary die cutter, which is supported so as to be able to cut by sandwiching a workpiece between an outer peripheral surface of the anvil and a blade die formed on an outer peripheral surface of the die, wherein the die is made of a hard material, A rotary die cutter characterized in that the blade edge of the blade die formed on the outer peripheral surface is flush with the outer peripheral surface of the enlarged diameter portion or projects radially outward by a predetermined length. 2. The blade edge convex amount from the outer peripheral surface of the enlarged diameter portion is 0.
2. The rotary die cutter according to claim 1, wherein the diameter of the rotary die cutter is set in a range of about 4 [mu] m. 3. The rotary die cutter according to claim 2, wherein the outer surface of the cutting edge and the outer surface of the anvil both have a surface roughness of 0.4 μm or less.