JP3236905B2 - Rotary cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary cutter used for cutting a sheet-like work.

[0002]

2. Description of the Related Art A rotary cutter is a kind of tool used for cutting various kinds of workpieces in the form of a sheet, and has, for example, each configuration as shown in FIG. In FIG. 1, reference numeral 1 denotes a cylindrical die roll, and a convex cutting edge 1 a having a predetermined (triangular in the figure) planar shape is provided integrally with the die roll 1 on an outer peripheral surface thereof. Have been.
The convex cutting blade 1a projects radially outward from the outer peripheral surface of the die roll 1 at a constant height, and a cutting edge is formed at the tip (outer peripheral end) thereof.

Reference numeral 2 denotes an anvil roll having a cylindrical shape and a smooth outer peripheral surface, and the die roll 1 and the anvil roll 2 are rotatable around _two parallel axes (reference numerals A ₁ and A _{2 in the} figure). It has become. Each of the die roll 1 and the anvil roll 2 is made of a hard material such as steel or a WC-Co cemented carbide.

A die roll 1 and an anvil roll 2
Are rotated in mutually opposite directions (arrows R ₁ and R _{2 in the} figure) around the axes A ₁ and A ₂ , respectively, and the work 3 is inserted between the die roll 1 and the anvil roll 2. Travels in the direction of arrow P in FIG.
, The convex cutting blade 1a is rotationally pressed onto the work 3. As a result, the work 3 is cut into a shape F according to the planar shape of the convex cutting blade 1a, and a product having the shape F is obtained.

[0005]

However, in the rotary cutter, if the hardness of the die roll 1 is higher than the hardness of the anvil roll 2, the following problems may occur.

(1) The die roll 1 is brought into contact with the die roll 1 and the anvil roll 2 when the work 3 is cut.
Of the anvil roll 2 bites into the outer peripheral surface of the anvil roll 2, so that a submicron-order concave portion is generated on the outer peripheral surface of the anvil roll 2. As a result, it becomes difficult to maintain good cutting characteristics, and uncut portions and the like easily occur.

(2) As the toughness of the convex cutting edge 1a decreases,
Since the relative cutting edge strength of the convex cutting blade 1a with respect to the anvil roll 2 is reduced, defects such as chipping occur at the cutting edge of the convex cutting blade 1a due to repeated contact with the anvil roll 2, and the convex cutting blade 1a The sharpness decreases.

(3) In the outer peripheral surface of the die roll 1, portions other than the convex cutting edge 1a relatively form concave portions (relief portions), and therefore, the convex cutting edge 1a due to a temperature change during the cutting operation. The stress concentration occurs between the relief portion and the relief portion. However, since the toughness of the die roll 1 is low, defects due to the stress concentration are likely to occur in the die roll 1. In particular, when the shape of the convex cutting edge 1a is complicated, the influence is large.

When the work 3 contains water or other solvent, or is a medicinal product such as a patch, the die roll 1 and the anvil roll 2 are made of steel, WC-Co cemented carbide or the like. In the above-mentioned conventional rotary cutter, the surface of the die roll 1 and the anvil roll 2 including the convex cutting edge 1a may be particularly corroded by the action of water and chemical substances contained in the work 3. as a result,
As the wear of the convex cutting edge 1a progresses easily, the convex cutting edge 1a
However, there has been a problem that the sharpness of the powder is reduced early and it is difficult to maintain good sharpness.

[0010]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and has a cylindrical shape and a die roll provided with a convex cutting blade having a predetermined planar shape on an outer peripheral surface thereof.
An anvil roll having a cylindrical shape and a smooth outer peripheral surface, rotating the die roll and the anvil roll in mutually opposite directions around two parallel axes, and between the die roll and the anvil roll. In the rotary cutter that cuts the work into a predetermined shape by rotating and pressing the convex cutting blade on the work by allowing the work to pass through, at least the surface of the die roll of the die roll and the anvil roll, Ni, C
o + Cr, Co + Ni or together are made of corrosion resistant cemented carbide containing a binder phase metal (s) selected from Co + Cr + Ni,, the H _R A hardness of at least the distal end side of the convex cutting edge and H ₁ If the H _R a hardness of the anvil roll was H _2, H _R a hardness H ₁ of at least the tip end of the convex cutting edge is in the range of 84 ≦ H ₁ ≦ 93, and an H ₁ H ₂ is within the range of 0 ≦ H ₂ −H ₁ ≦ 4.

[0011]

[0012]

In the rotary cutter of the present invention, hardness of at least the convex cutting edge at the tip side of the die roll is equal to or hardness of the anvil roll, are set low so that the range of 4 or less in H _R A hardness I have. Therefore, even when the die roll and the anvil roll come into contact with each other when the work is cut, the die roll does not easily bite into the anvil roll, and as a result, the occurrence of a concave portion on the outer peripheral surface of the anvil roll due to the contact between the die roll and the anvil roll can be minimized. .

Further, since the toughness of the convex cutting edge is improved, occurrence of defects such as chipping at the cutting edge of the convex cutting edge due to repeated contact with the anvil roll is suppressed. In addition, even when a stress concentration occurs between the convex cutting edge and the relief formed on the die roll due to a temperature change during the cutting operation, the occurrence of defects due to the stress concentration is suppressed.

Further, at least the surface of the die roll of the die roll and the anvil roll is made of Ni, C
By using a corrosion resistant cemented carbide containing a metal (group) selected from o + Cr, Co + Ni, or Co + Cr + Ni as a binder phase, at least the corrosion resistance of the die roll is improved.

[0015]

EXAMPLES Examples of the present invention will be described below in more detail. Since the present invention utilizes the difference in hardness between the die roll and the anvil roll, the configuration of the rotary cutter itself is not different from the conventional one. Therefore, the members of the rotary cutter described in the following description are denoted by the same reference numerals as those of the conventional rotary cutter, and the description thereof will be omitted.

[0016] In the rotary cutter of this embodiment, the H _R A hardness of the entire die roll 1 including a convex cutting edge 1a and H _1, if the H _R A hardness of the anvil roll 2 and the H _2, and H ₁ H ₂ is set so as to be within the range of 0 ≦ H ₂ −H ₁ ≦ 4.

The reason why 0 ≦ H ₂ −H ₁ is 0
> H ₂ −H ₁ That is, if the hardness of the die roll ₁ is higher than the hardness of the anvil roll 2, the problems described in the above (1) to (3) occur. In addition, H ₂ −
The reason for the H ₁ ≦ 4, the die roll 1 and the difference in hardness between the anvil roll 2 is the hardness of the die roll 1 to over 4 in H _R A hardness decreases, convex rigid convex cutting edge 1a is lowered This is because the cutting edge 1a is easily worn away, and the life of the convex cutting edge 1a is reduced to a level that causes a practical problem.

In particular, in order to suppress the occurrence of the problems described in the above (1) to (3) and to maintain the life of the convex cutting edge 1a to such an extent that it does not pose a practical problem, the die roll 1 is required. H _R a hardness H ₁ is desirably in a range of 84 ≦ H ₁ ≦ 93.

The materials of the die roll 1 and the anvil roll 2 are arbitrarily selected from hard materials which can be used for a rotary cutter and satisfy the above conditions.
In particular, when the work 3 contains water or another solvent, or is a medicine such as a patch, at least the surface of the die roll 1 is made of Ni, Co + Cr, Co + N
i, or a metal (group) selected from Co + Cr + Ni
, A WC-Ni-based, WC-Co-
Cr-based, WC-Co-Ni-based, or WC-Co-Cr
-It is desirable to use a Ni-based cemented carbide or a ceramic.

This is because Cr and / or N
With the addition of i, the corrosion resistance of the cemented carbide is improved, and as a result,
In particular, the surface of the die roll 1 including the convex cutting edge 1a is hardly corroded, and the sharpness of the convex cutting edge 1a is maintained for a long time. Further, even when at least the surface of the die roll 1 is made of ceramic, the corrosion resistance of the die roll 1 is improved, so that the sharpness of the convex cutting blade 1a can be maintained long.

In the rotary cutter having the above structure, the rigidity of the die roll 1 is relatively low, so that even if the die roll 1 and the anvil roll 2 come into contact with each other when the work 3 is cut, the die roll 1 is less likely to bite into the anvil roll 2. Has become. Therefore, it is possible to minimize the occurrence of concave portions on the outer peripheral surface of the anvil roll 2 due to the contact between the die roll 1 and the anvil roll 2, and as a result, it is possible to maintain good cutting characteristics without any uncut portion for a long time. Becomes

Further, as the toughness of the die roll 1 is improved, the relative edge strength of the convex cutting edge 1a with respect to the anvil roll 2 is also increased.
The tip of the protruding cutting edge 1a hardly suffers a defect such as chipping even if it is repeatedly contacted. Therefore, high sharpness can be maintained for a long time.

Moreover, since the toughness of the die roll 1 is high,
Even when a stress concentration occurs between the convex cutting blade 1a and the relief portion formed on the die roll 1 due to a temperature change during the cutting operation, there is also an effect that generation of defects due to the stress concentration is suppressed.

On the other hand, at least the surface of the die roll 1
As required, Ni, Co + Cr, Co + Ni, or C
At least the corrosion resistance of the die roll 1 is improved by using a corrosion resistant cemented carbide or a ceramic containing a metal (group) selected from o + Cr + Ni as a binder phase. Therefore, even when the work 3 contains water or other solvent, or is a medicine such as a patch, the die roll 1 does not corrode, and as a result, the sharpness of the convex cutting blade 1a is maintained for a long time. Is done.

[0025] In the above embodiment, the die roll 1 overall hardness comprising a convex cutting edge 1a, or equal to the hardness of the anvil roll 2, has been set to be lower in the range of 4 or less in H _R A hardness, As long as the hardness of at least the tip side of the convex cutting edge 1a is set within the above range, the above effect can be exerted.

The corrosion resistance of the rotary cutter can of course be further increased by making the material of the die roll 1 and the anvil roll 2 from cemented carbide or ceramic of the above composition.

[0027]

As described in the foregoing, in the rotary cutter of the present invention, H _R A hardness H ₁ of the front end side of at least the convex cutting edge of the die rolls is, range of 84 ≦ H ₁ ≦ 93
Within the box and the hardness of the anvil roll, or H _R
It is set low so as to be in the range of 4 or less in A hardness.
As a result, it is possible to obtain a rotary cutter having excellent characteristics that can maintain good cutting characteristics without leaving uncut portions and high sharpness over a long period of time and hardly cause defects due to a temperature change during the cutting operation.

Further, at least the surface of the die roll is
i, Co + Cr, Co + Ni, or Co + Cr + Ni
By using a corrosion-resistant cemented carbide containing a metal (group) selected from the group consisting of as a binder phase, at least the corrosion resistance of the die roll is improved. As a result, the die roll does not corrode even when the work contains water or other solvent, or is a medicinal product such as a patch, and as a result, high sharpness can be maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of a general rotary cutter and a cutting state of a work by the rotary cutter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Die roll 1a Convex cutting blade 2 Anvil roll 3 Work A1, A2 axis F Product shape P Work running direction R ₁ Die roll rotation direction R ₂ Anvil roll rotation direction

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuhiko Takahashi 1528 Nakashinda, Yokoi, Kobe-cho, Anpachi-gun, Gifu Prefecture Mitsubishi Materials Corporation Gifu Works (56) References A) JP-A-3-246000 (JP, A) JP-A 5-85598 (JP, U) JP-A 61-137500 (JP, U) JP-A 4-45700 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B26F 1/00-1/46 B26D 1/40

Claims (1)

(57) [Claims] 1. A die roll having a cylindrical shape and provided on its outer peripheral surface with a convex cutting edge having a predetermined planar shape, and a cylindrical anvil roll having a smooth outer peripheral surface, The die roll and the anvil roll are parallel
By rotating the work in opposite directions about an axis, and inserting the work between the die roll and the anvil roll, the convex cutting blade is rotated and pressed onto the work, and the work is formed into a predetermined shape. In a rotary cutter for cutting, at least the surface of the die roll among the die roll and the anvil roll is Ni, Co + Cr, Co + N
i, or a metal (group) selected from Co + Cr + Ni
Together are made of corrosion resistant cemented carbide containing a binding phase, the H _R A hardness of at least the distal end side of the convex cutting edge and H _1, the H _R A hardness of the anvil roll was with H ₂ If
H _R A hardness H ₁ of at least the tip end of the convex cutting edge is in the range of 84 ≦ H ₁ ≦ 93, and is the H ₁ and H _2, the range of 0 ≦ H ₂ -H ₁ ≦ 4 A rotary cutter, which is located inside.