JP4245088B2 - Die cut roll - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a die-cut roll used for cutting sheet-like products such as paper diapers and sanitary napkins.
[0002]
[Prior art]
As shown in FIG. 3 , this die cut roll is driven by a motor 3 to rotate a die cutter 2 provided with a convex pressing blade 1 formed on the surface of a rotary drive roll in accordance with the shape of the product to be cut on one side, The work 5 to be cut is passed between the anvil rolls 4 provided on the other side, the die cutter 2 is pressed against the anvil roll 4, and the traveling work 5 is cut into a predetermined shape by the convex pressing blade 1.
[0003]
Many attempts have been made to improve the sharpness of the convex cutting blade and extend its service life. For example, in Japanese Patent No. 2593570, the pressing tip of the convex pressing blade and the surface of the anvil roll It has been disclosed that the relationship of the hardness of the steel has an effect on its life, and that the life is extended 10 times or more by setting both the hardness differences to HrA 0.1 or more, and JP-A-7-227798 discloses The selection of specific materials for forming the hardness difference is disclosed.
[0004]
Japanese Patent Application Laid-Open No. 8-71999 discloses a longer life from the shape surface of the convex pressing blade, and the width of the convex pressing blade in the axial direction portion of the die cutter is larger than the width of the circumferential portion. It has been disclosed that the life can be extended by reducing the size, and Japanese Patent Application Laid-Open No. 8-72000 discloses a two-axis driving method in which the driving of the anvil roll is driven by two synchronized axes, and only the die cutter is driven. A die cutter is disclosed in which a crown is provided in any of the uniaxial drive systems in which an anvil roll is driven.
[0005]
[Problems to be solved by the invention]
However, cutting with this die-cut roll is a special method in which a sheet-shaped raw material workpiece is pressed against the surface of a rotating hard anvil roll with a sharp convex cutting blade, so the wear form of the convex cutting blade is In addition to the complicated problems described in the above prior art, there are factors that cause cutting defects of the workpiece and chipping of the convex pressing blade.
[0006]
For example, because the convex cutting blade on the die cutter is discontinuously present on the surface of the die cutter in the rotational circumferential direction, extreme repeated stress acts on the convex cutting blade, increasing the amount of wear. , Cause cut defects and chipping. Even if a convex cutting blade is provided in the entire circumference of the die cutter, if the axial cutting length of the convex cutting blade is shortened due to the shape, stress will concentrate on the convex cutting blade and wear will occur. Causes increased volume and chipping.
[0007]
FIG. 4 shows a conventional die cutter. The convex pressing blade 1 on the die cutter 2 protrudes from the guide flange 6 by about several μm. And since the convex cutting blade 1 on the die cutter 2 exists discontinuously in the rotational circumferential direction of the surface of the die cutter 2, when cutting the workpiece 5, the convex cutting blade at the discontinuous portion. Extremely repetitive stress acts on the end of 1 to increase the wear force and cause cut defects and chipping.
[0008]
In addition, as shown in FIG. 5 , as a conventional die cutter, there is one in which the convex pressing blade 1 is crossed and continuous, but also in this example, the difference in peripheral speed between the die cutter and the anvil roll, The stress caused by the feeding of the workpiece 5 is concentrated at the intersection where the cutting length in the axial direction of the convex pressing blade 1 is reduced, causing an increase in wear amount and chipping.
[0009]
The problem to be solved by the present invention is to provide means for effectively reducing the stress concentration on the convex pressing blade for cutting into the final shape.
[0010]
[Means for Solving the Problems]
The present invention provides a die-cut roll comprising a combination of a die cutter and an anvil roll provided with a convex pressing blade formed on the surface of a rotary drive roll in accordance with the shape of the product to be cut. Separately from this convex pressing blade, the product is supplemented with at least discontinuous locations in the circumferential direction of the convex pressing blade formed together or where the axial cutting length of the convex pressing blade is shortened. The problem was solved by providing a convex press cutting blade that does not directly function for cutting, so-called throwing blade .
[0011]
Thereby, the concentration of excessive repetitive stress on the convex cutting edge can be reduced by dispersing the position where the cutting edge is concentrated by the convex cutting edge of the die cutter.
[0012]
The materials constituting the die cutter and anvil roll are as follows: cemented carbide such as WC base alloy, cermet such as Ti base alloy, high speed steel (high speed), Al ₂ O ₃ system, ZrO ₂ system, SiC system, Si Hard materials such as ₃ N ₄ -based ceramics can be used, and among them, the use of carbide bond hard materials such as WC-based alloys and Ti-based alloys is particularly preferable.
[0013]
The tip side hardness (H _R A) H _{1 of the} convex pressing blade that does not directly function for product cutting and the tip side hardness (H _R A) H ₂ of the convex pressing blade for products are 82 ≦ (H ₁ , H ₂ ) It is preferably within the range of ≦ 96.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the present invention will be described with reference to an example applied to a die cutter for obtaining a paper sheet product.
[0015]
Example 1:
This embodiment shows an example in which excessive repetition stress is reduced on the cutting edge of a convex pressing blade by providing a discarding blade.
[0016]
The die cutter 2 shown in FIG. 1 has a roller body having a guide flange 6 on the periphery, and a convex pressing blade 1 formed in accordance with the shape of the paper sheet product is provided, and a product cutting area 7 is formed on the inside thereof. is doing.
[0017]
10 is a so-called throwing blade that does not directly function for cutting according to the present invention, and FIG. 1 shows an example in which it is provided in addition to the convex cutting blade 1 for products. The throwing blade 10 is provided in the circumferential direction so as to compensate for a discontinuous portion in the circumferential direction of the rotary drive roll body indicated as X. Since the cutting edge shape / height of the throwing blade 10 is set to the same wear speed as that of the convex pressing blade 1, stable cutting characteristics can be obtained. Therefore, the same cutting edge shape is used with the same material as the convex cutting blade 1 for products.・ It has a height. Furthermore, if the width is smaller than the width of the workpiece 5 and the length is larger than X, excessive repetitive stress can be relieved, and the wear speed of the convex pressing blade 1 and the throwing blade 10 can be made comparable. It is convenient in terms of cutting performance and economy.
[0018]
Two or more rows of throwing blades may be provided in the axial direction, or the shape of the throwing blades may be an arc.
[0019]
Example 2:
This embodiment shows an example in which the present invention is applied to a continuous blade on which a convex cutting blade for product 1 on a die cutter intersects. In FIG. 2 showing the embodiment, the throwing blade 10 is formed so as to compensate for a concentrated portion with respect to the axial direction of the convex pressing blade 1 indicated as Y. By providing this throwing blade 10, the stress resulting from the difference in the peripheral speed of a die cutter and an anvil roll and the workpiece | work feeding can be relieved.
[0025]
【The invention's effect】
According to the present invention, excessive repeated stress does not work locally on the convex cutting edge for products, preventing chipping, reducing local wear of the die cutter and anvil roll constituting the die cutting roll, and die cutting The life of the roll can be extended.
[Brief description of the drawings]
FIG. 1 shows a first embodiment of the present invention.
FIG. 2 shows a second embodiment of the present invention.
FIG. 3 shows an outline of the configuration of a die cut roll.
FIG. 4 shows a conventional die cutter.
FIG. 5 shows another example of a conventional die cutter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Convex cutting blade 2 Die cutter 3 Motor 4 Anvil roll 5 Workpiece (workpiece) 6 Guide flange 10 Discarding blade X Discontinuous part of convex cutting blade in the circumferential direction Y Concentration with respect to the axial direction of the convex cutting blade

Claims (5)

In the die cut roll consisting of a combination of a die cutter and an anvil roll provided with a convex pressing blade for product formed on the surface of the rotary drive roll according to the shape of the product to be cut,
A die cut roll characterized in that at least a discontinuous portion in the circumferential direction of the rotational drive roll of the convex cutting blade for product of the die cutter is provided, and a convex cutting blade that does not directly function for product cutting is provided. The convex pressing blade that does not directly function for cutting the product is provided in the circumferential direction of the rotational drive roll, and the length thereof is larger than the length of the discontinuous portion in the circumferential direction of the rotational drive roll. The die cut roll described in 1. In the die cut roll consisting of a combination of a die cutter and an anvil roll provided with a convex pressing blade for product formed on the surface of the rotary drive roll according to the shape of the product to be cut,
At least a convex pressing blade that does not directly function for product cutting is provided in the circumferential direction of the rotational drive roll at an interval from the concentrated portion of the convex cutting blade for product in the rotational drive roll axis direction to the rotational drive roll axis direction. A die-cut roll characterized by that. The tip side hardness (H _R A) H _{1 of the} convex pressing blade that does not directly function for cutting the product is in the range of 82 ≦ H ₁ ≦ 96. The die cut roll described in 1. The tip side hardness (H _R A) H _{2 of the} convex pressing blade for products formed in accordance with the shape of the product to be cut is in the range of 82 ≦ H ₂ ≦ 96. Item 5. The die cut roll according to any one of Items 4 to 5 .

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