JP4234284B2 - Cutting blade for metal plate stack and method for cutting metal plate stack using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutting blade for cutting a metal plate stack in which a plurality of metal plates are stacked, and a method for cutting a metal plate stack using the same.
[0002]
[Prior art]
When cutting a metal plate, for example, an aluminum plate having a photosensitive layer on the surface thereof into a predetermined size, such as a photosensitive lithographic printing plate, a number of aluminum plates and paper protecting the photosensitive layer on the surface are formed. A method of cutting by stacking alternately stacked metal plate stacks on a cutting machine and pressing a single-edged cutting blade against the metal plate stack is used.
[0003]
FIG. 3 is a schematic view showing an example of a conventional sheet metal sheet cutting machine.
The cutting machine 30 includes a receiving base 31 for setting the metal plate stack 20, a cutting blade 32, and a drive device (not shown) for driving the cutting blade 32.
In the cutting machine 30, the metal plate stack 20 is cut by driving the cutting blade 32 in the X direction shown in the drawing.
[0004]
However, when cutting the metal plate stack 20 with this cutting machine 30, depending on the material of the material to be cut and the number of stacked sheets, as shown in FIG. As a result of the friction between the cutting blade 32 and the metal plate stack 20, a metal powder adhesion 21 generated from the metal plate is formed on the blade surface of the cutting blade 32. The adhered material 21 causes a scratch 23 extending in the X direction on the cut surface 22 of the metal plate stack 20.
[0005]
As a method for preventing the occurrence of such an adherent, a method in which polyethylene laminated paper is sandwiched between metal plates is disclosed in JP-A-56-29243. Japanese Laid-Open Patent Publication No. 57-99647 discloses a method for enhancing the lubricating action by sandwiching a sheet containing halide internally between metal plates.
[0006]
However, these special papers are expensive, and sandwiching such papers between the metal plates has been a factor that raises the manufacturing cost of the metal plates. Further, in the method using polyethylene laminated paper, when the paper is peeled off from the metal plate, high voltage static electricity is generated, and the operator may receive an electric shock, thereby reducing workability.
[0007]
As a cutting method for solving such a problem, a method using a cutting blade whose surface is coated with hard carbon is disclosed in JP-A-2-83197.
The cutting blade coated with hard carbon has a low coefficient of friction on the surface, so there is little generation of metal powder due to friction, and it cuts the metal plate stack with cheap synthetic paper instead of the special paper mentioned above. However, it is said that adhesion of the metal powder to the blade surface can be suppressed.
[0008]
However, since the hard carbon coating is too hard, when the cutting is repeated, the coating is gradually chipped, and there is a problem that an adhesion due to metal powder is generated on the blade surface after about 1000 cuttings. Moreover, since the coating of the blade surface is gradually lost, there is also a problem that the cutting edge of the cutting blade becomes worse every time the cutting is repeated.
It has been considered that the surface of the hard carbon coating is further coated with a resin such as silicon or Teflon to reduce the friction coefficient of the surface of the cutting blade. However, since these resins are peeled off immediately, it is necessary to repeat the coating frequently, which is not practical.
[0009]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to cut a metal plate stack using the cutting blade for a metal plate stack capable of suppressing the generation of adhesions for a long period of time and maintaining a good sharpness for a long period of time. It is to provide a method.
[0010]
[Means for Solving the Problems]
Accordingly, the inventors have used a cutting blade coating that has excellent releasability, a low friction coefficient, and an appropriate hardness, thereby suppressing the occurrence of adhesion for a long period of time and improving the sharpness for a long period of time. It was found that it can be maintained, and the present invention was reached.
[0011]
That is, the cutting blade for stacked metal plates of the present invention is a cutting blade for cutting a stacked metal plate in which a plurality of metal plates are stacked, and a fluoropolymer hard film is provided on the surface of the base material. It is characterized by.
Further, the Vickers hardness of the base material is 500 to 1000, the Vickers hardness of the fluoropolymer hard film is 1400 to 2600, and the difference between the Vickers hardness of the fluoropolymer hard film and the Vickers hardness of the metal plate is 1340 or more. It is desirable to be.
In addition, the cutting method of the metal plate stack of the present invention is a method of pushing the cutting blade for the metal plate stack of the present invention into the metal plate stack of a plurality of metal plates stacked. It is characterized by cutting.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
FIG. 1 is a cross-sectional view showing an example of a cutting blade for stacked metal sheets (hereinafter referred to as a cutting blade) according to the present invention.
The cutting blade 1 is a single blade, and one surface of the cutting edge 2 is a vertical surface 3 that comes into contact with the cutting surface of the metal stack when cutting, and the other surface is a cutting edge surface 4 that is inclined obliquely. ing. A fluoropolymer hard film 6 is provided on the surface of the base material 5 of the vertical surface 3.
[0013]
As the base material 5, high speed tool steel (SKH), alloy tool steel (SKD) or the like defined in JIS G 4403 is used.
The Vickers hardness of the base material 5 is preferably 500 to 1000, and more preferably 590 to 940. If the Vickers hardness of the base material 5 is less than 500, it is too soft and the cutting edge 2 of the cutting blade 1 may be deformed. Moreover, when the Vickers hardness of the base material 5 exceeds 1000, it will become hard too much and the cutting edge 2 of the cutting blade 1 will become brittle.
[0014]
The fluoropolymer hard film 6 is formed by plasma polymerization using a mixed gas containing a fluorine-based gas as a main component.
Specifically, fluorine gas and hydrocarbon gas mixed gas is decomposed by arc discharge plasma in a high vacuum, and ions and excited molecules in the plasma are electrically accelerated to the cutting blade and collided with energy. A polymerized hard film is formed.
[0015]
The Vickers hardness of the fluoropolymer hard film 6 is preferably 1400 to 2600, and more preferably 1500 to 2500. When the Vickers hardness of the fluorine-polymerized hard film 6 is less than 1400, the cutting blade 1 is inferior in sharpness. , Sharpness decreases early.
Further, the difference between the Vickers hardness of the fluoropolymer hard film 6 and the Vickers hardness of the metal plate stacked metal plate is preferably 1340 or more, more preferably 1440 or more. If this difference is less than 1340, the fluoropolymer hard film 6 is likely to be chipped, and the sharpness of the cutting blade 10 is lowered early. Examples of the metal plate that satisfies such conditions include an aluminum plate such as A1050P-H18 defined in JIS H4000.
[0016]
The thickness of the fluoropolymer hard film 6 is preferably 0.8 to 1.2 μm, more preferably 0.9 to 1.1 μm. When the thickness is less than 0.8 μm, the sharpness of the cutting blade 1 is insufficient, and when it exceeds 1.2 μm, the fluoropolymer hard film 6 tends to be chipped.
The friction coefficient of such a fluoropolymer hard film 6 is usually about 0.06, which is smaller than that of a conventional hard carbon coating (about 0.1).
In the illustrated example, the fluoropolymer hard film 6 is provided on the vertical surface 3 of the cutting blade 1, but the fluoropolymer hard film 6 may also be provided on the blade edge surface 4.
[0017]
Next, the cutting method of the metal plate pile using the cutting blade of this invention is demonstrated.
FIG. 2 is a schematic view showing an example of a cutting machine using the cutting blade of the present invention. The cutting machine 10 includes a cradle 11 for setting the metal plate stack 20, a cutting blade 1, and a drive device (not shown) for driving the cutting blade 1.
The cutting of the metal plate stack 20 is performed by driving the cutting blade 1 in the X direction shown in the drawing.
[0018]
The Vickers hardness of the metal plate of the metal plate stack 20 is preferably in the range of 40-60. When the Vickers hardness of the metal plate is within this range, the balance between the cutting blade 1 and the hardness of the fluoropolymer hard film 6 on the surface thereof and the hardness of the metal plate is improved, and generation of metal powder from the metal plate is suppressed. Further, since the cutting blade 1 and the fluoropolymer hard film 6 on the surface thereof are less likely to be chipped, the adhesion of the metal powder to the vertical surface 3 and the blade edge surface 4 can be suppressed for a long period of time, and the cutting blade 1 can be kept sharp for a long period of time. be able to. Examples of such a metal plate include the aluminum plate described above.
[0019]
In such a cutting blade 1 and a cutting method using the same, since the fluoropolymer hard film 6 is provided on the surface of the cutting blade 1, the friction between the cutting blade 1 and the metal plate stack 20 is reduced. It becomes small and generation | occurrence | production of the metal powder from a metal plate can be suppressed. Therefore, the adhesion of the metal powder to the vertical surface 3 and the blade edge surface 4 is suppressed, and the cut surface 22 of the metal plate stack 20 is less likely to be damaged by the adhered material.
Moreover, since the fluoropolymer hard film 6 provided on the surface of the cutting blade 1 is not too hard like a conventional hard carbon coating (Vickers hardness 3000 to 5000), it is difficult to be chipped even if cutting is repeated. Therefore, the adhesion of the metal powder to the vertical surface 3 and the blade edge surface 4 can be suppressed for a long time, and the sharpness of the cutting blade 1 can be maintained for a long time.
[0020]
【Example】
Examples are shown below.
(Example)
Fluoropolymerized hard with a thickness of 1 μm by plasma polymerization using a mixed gas mainly composed of fluorine-based gas on the vertical surface 3 and the blade edge surface 4 of the base material 5 made of alloy tool steel (SKD11) having a Vickers hardness of 697 The film 6 was formed into a cutting blade 1.
Using this cutting blade 1, a metal plate stack in which a planographic printing plate having a photosensitive layer provided on the surface of a 0.3 mm thick aluminum plate and 0.05 mm thick synthetic paper are alternately stacked is repeated. Cut out.
Cutting was repeated 2000 times, but no adherent was observed on the vertical surface 3 and the blade edge surface 4 of the cutting blade 1.
[0021]
(Comparative example)
A cutting surface blade was obtained by applying a hard carbon coating of 1 μm to the vertical surface and the cutting edge surface of a base material made of a Vickers hardness 697 alloy tool steel (SKD11).
Using this cutting blade, it repeatedly cuts metal plate stacks in which lithographic printing plates with a photosensitive layer provided on the surface of a 0.3 mm thick aluminum plate and 0.05 mm thick synthetic paper are stacked alternately did.
The generation of adhesives was observed up to 1000 times of cutting, and adhesion of the adhesives to the blade surface (vertical surface, blade surface) and separation from the blade surface were repeated. When cutting was performed with the adhesive on the blade surface, scratches were generated on the cut surface of the metal plate stack.
[0022]
【The invention's effect】
As described above, the cutting blade for cutting metal sheet piles according to the present invention has a fluoropolymer hard film provided on the surface of the base material, so that it is possible to suppress the generation of adhesions for a long period of time. The sharpness can be maintained for a long time.
Further, the Vickers hardness of the base material is 500 to 1000, the Vickers hardness of the fluoropolymer hard film is 1400 to 2600, and the difference between the Vickers hardness of the fluoropolymer hard film and the Vickers hardness of the metal plate is 1340 or more. If there is, the deformation of the cutting edge, chipping of the cutting edge, chipping of the fluoropolymer hard film on the surface of the cutting blade and reduction of the cutting edge sharpness can be reduced, and the generation of adhesives can be further suppressed for a long period of time. Can be kept for a long time.
[0023]
Further, the cutting method of the metal plate stack of the present invention is a method of pushing the cutting blade for cutting a metal plate stack of the present invention into the metal plate stack of a plurality of metal plates stacked. Since it is a method of cutting a thing, generation | occurrence | production of an adhesion thing can be suppressed for a long time, and a favorable sharpness can be maintained for a long time.
And, in such a cutting blade for cutting a metal plate stack and a method for cutting a stack of metal plates using the same, since the generation of adhesions is suppressed, the metal plate and the metal plate An inexpensive synthetic paper can be used instead of the conventional special paper as the paper sandwiched between them. Thereby, it becomes possible to reduce the manufacturing cost of a metal plate, to prevent an electric shock when the paper is peeled off, and to improve workability.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a cutting blade for cutting metal sheet stacks according to the present invention.
FIG. 2 is a schematic view showing an example of a cutting machine using a cutting blade for cutting metal sheet stacks according to the present invention.
FIG. 3 is a schematic view showing an example of a cutting machine using a conventional cutting blade for cutting stacked metal sheets.
[Explanation of symbols]
1 Cutting blade (Cutting blade for cutting metal stacks)
5 Base material 6 Fluoropolymer hard film 20 Metal plate stack

Claims (3)

A cutting blade for cutting a metal plate stack in which a plurality of metal plates are stacked, wherein the metal plate stack has a fluoropolymer hard film provided on the surface of the base material by plasma polymerization Cutting blade. A Vickers hardness of the base material is 500 to 1000, according to claim 1 the metal plate stacking thereof for cutting blade, wherein the Vickers hardness of the fluoropolymer hard film is 1,400 to 2,600.  The metal plate stack is cut by pushing the cutting blade for the metal plate stack according to claim 1 or 2 into the metal plate stack in which a plurality of metal plates are stacked. Cutting method for stacked objects.

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