JPH0627321B2 - Ceramic coating blade manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is characterized by forming a nitride or carbide film on the blade portion of a flat blade-shaped blade substrate on which the blade portion is formed. Manufacturing method.

(Prior Art) Conventionally, a knife made of carbon steel or stainless steel has been used for knives, knives, and scissors. However, carbon steel easily causes rust, and stainless steel having high corrosion resistance has a soft cutting edge and can be repeatedly used. There is a drawback in that the sharpness is reduced due to the wear of the cutting edge. Therefore, in recent years, it has been considered to form a film of titanium nitride or the like on an edged tool such as an electric razor or scissors by an ion plating method, for example, as described in JP-A-60-227790. It has been proposed to form a cemented carbide film of a titanium compound such as titanium nitride by an ion plating method on the entire surface of the moving blade or the stationary blade, and it has been noted that it does not have the drawbacks of the above-mentioned stainless steel blades and the like. It was

(Problems to be solved by the invention) However, when a cemented carbide film is formed on the blades such as electric razors and scissors by the ion plating method, the blade bases are separated from each other on the material mounting base in the vacuum chamber. Since a means for mounting and forming a film on the entire surface of the blade substrate is taken, even if such a method is applied to a blade substrate such as a plate-shaped knife or knife having a blade portion, it is possible to cover the entire surface of the blade substrate. Since a film is formed, it is useless to form a film other than the blade part with a knife such as a knife or knife where the part that affects the sustainability of sharpness is only in the blade part. Since the tool bases are mounted in separate spaces separately from each other, the number of tool bases mounted on the material mounting base is limited.

The object of the present invention is to solve the above-mentioned drawbacks of the conventional ceramic coating blade manufacturing method, to form a coating with high hardness and excellent wear resistance only on the blade portion, and to coat a large amount by the reactive ion plating method. It is an object of the present invention to provide a method for manufacturing a treatable ceramic coating blade.

(Means for Solving Problems) In the method for manufacturing a ceramic coating blade of the present invention, a plurality of flat plate-shaped blade bases having blade portions are superposed so that respective blade edges are flush with each other. In this state, it is attached to the blade mount, and in the atmosphere containing the active gas, the blade edge of the blade is directed toward the metal evaporation source, and a film of nitride or carbide is formed on the surface of the blade portion of the blade base by the ion plating method. Especially.

(Function) According to the present invention having the above-described structure, the nitride or the carbide generated by the reaction between the metal ions generated from the metal vapor deposition source and the active gas is the overlapping portion of the flat plate-shaped blade substrate on which the blade portion is formed. No film is formed on the
A nitride or carbide film will be formed only in the vicinity of the blade portion and the blade edge, and the film will not be formed even in a portion that does not require high hardness and wear resistance.
By stacking flat plate-shaped blade bases, a large amount of blade bases can be mounted on the material mounting base, and the batch processing capacity in the vacuum chamber in a limited space is increased.

(Example) Hereinafter, an example of the manufacturing method of the ceramic coating knife of this invention is demonstrated with drawing.

FIG. 1 schematically shows an ion plating apparatus for carrying out the method of the present invention. To the cathode 2 to which a negative voltage is applied in the vacuum chamber 1, a plurality of flat plate-shaped blade base bodies 3 each having a blade portion 32 formed thereon are attached via a material attachment base 4 in a stacked state. Each blade edge 31 of the blade substrate 3 ··· is directed toward the metal evaporation source 5 installed below the cathode 2, and vaporized materials such as titanium, chromium or tantalum evaporated from the metal evaporation source 5 are directed toward the blade edge 31. To irradiate. Nitrogen gas (N ₂ ) or an active gas such as C ₂ H ₂ is introduced into the vacuum chamber 1 through a pipe 6.

FIG. 2 shows an example in which a knife base of a kitchen knife made of stainless steel is used as the blade base 3 attached to the material mounting base 4, and the blade base 3 has a flat plate-shaped edge with a sharp edge.
A blade portion 32 having 31 is formed and preliminarily cleaned by ultrasonic cleaning. A plurality of blade bases 3 are superposed on each other, and the respective blade edges 31 are aligned so as to be flush with each other.
As shown in the figure, the shaft 4 is installed horizontally in the handle mounting holes 34, 34 of the handle 33 with the cutting edge 31 facing the metal evaporation source 5 on the material mount 4.
Insert 1,41 and attach.

Reference numeral 7 denotes a spacer which is inserted between the handle portions 33 of each blade base body 3 so as to provide a space between blade base bodies.
Has an appropriate size.

Then, the knife base 3 of the above-mentioned plurality of stacked knives
A nitride or carbide film is formed by the ion plating method as follows.

That is, first, the blade base 3 is mounted on the material mounting base 4 with a predetermined number of blade bases 3 in the range where the angle θ at which the metal ions evaporated from the metal evaporation source 5 are diffusely irradiated is 20 degrees. The surface of the blade substrate 3 is ion-cleaned by titanium ions generated by the metal evaporation source 5 in an atmosphere depressurized to about 2 × 10 ⁻⁵ Torr in the vacuum chamber 1, and then nitrogen gas is introduced into the vacuum chamber 1 as an introduction gas. Introduce through line 6 by opening valve 61. Next, the inside of the tank is about 2X10 ^-5
With the pressure reduced to Torr, a voltage of 200 to 500 V is applied to the blade substrate 3 to generate titanium ions and nitrogen gas ions, and titanium nitride is electrically attracted and deposited on the surface of the blade portion 32 of the blade substrate 1. Then vapor deposition is performed.

In the above example, nitrogen gas was used as the introduction gas, and titanium was used as the evaporation source metal to form a nitride, but C ₂ H ₂ may be used as the introduction gas, or the evaporation source metal may be used. You may use metals, such as chromium and tantalum. In this case, these metal ions, including titanium, react with C ₂ H ₂ to form carbides. Further, the angle θ at which the metal ions evaporated from the metal evaporation source 5 diffusely irradiate is set to a range of 20 degrees, and a predetermined number of blade bases 3 ··· are mounted on the material mounting base 4, but this is not particularly limited. It does not have to be one, but may be within a range not exceeding 45 degrees. In the range of more than 45 degrees, the film formation on the blade bases 3 near both sides mounted on the material mounting base 4 is insufficient.

As shown in FIG. 3, the ceramic coating knife formed by the ion plating method as described above has a coating in which only the blade tip 31 of the blade portion 32 and the vicinity of the blade tip 31 are coated with a golden nitride. 35, the film 35 has high hardness and excellent wear resistance, and does not require polishing of the cutting edge.

The dimension L of the coating width can be appropriately selected by changing the thickness t of the spacer 7. FIG. 4 is a graph showing the relationship between the spacer thickness t and the coating width L when the blade base 3 having the handle portion 32 having a thickness of 2 mm is used as an example. The thickness of the spacer 7 is varied in the range of 0 mm to 5.0 mm. It shows that the dimensions of the coating width can be varied in the range of 5.0 mm to 15 mm.

(Effect of the Invention) According to the method of the present invention, a plurality of flat plate-shaped tool bases having blade parts are stacked and mounted on a tool mounting base in a state where the respective cutting edges are flush with each other. As a result, a large number of blade substrates can be put in a limited vacuum chamber, and the coating processing amount per batch increases and the production cost gradually decreases. Further, it becomes possible to form a nitride or carbide film only on the blade edge and in the vicinity of the blade edge, and prevent unnecessary film formation, so that the cost is gradually reduced, high hardness, excellent wear resistance, and ceramic that does not impair sharpness A coating knife can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic view of an ion plating apparatus for carrying out the present invention, FIG. 2 is a perspective view showing a state in which a plurality of knife bases of a knife are stacked, and FIG. 3 is a knife having a film formed thereon. The front view and FIG. 4 are graphs showing the relationship between the spacer thickness (t) and the coating width (L). Explanation of the code 3 …… Blade base, 31 …… Blade tip, 32 …… Blade part, 35 …… Coating, 4 …… Material mount, 5 …… Metal evaporation source, 7 …… Spacer

Claims (1)

[Claims] 1. A plurality of flat blade-shaped blade base bodies having blade portions are mounted on a blade mounting base in a state where they are stacked so that their blade edges are flush with each other, and in an atmosphere containing an active gas. A method for producing a ceramic coating blade, wherein the blade edge of the blade is directed toward a metal evaporation source, and a film of a nitride or a carbide is formed on the surface of the blade portion of the blade substrate by an ion plating method.