JPS6340591A - Blade - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Object and purpose of the invention] The present invention relates to improving the blades of electric razors, electric hair clippers, etc., and provides a blade with excellent wear resistance and corrosion resistance.
In particular, the purpose is to form a nitrogen compound film in close contact with the blade to impart wear resistance and corrosion resistance.

[Conventional technology]

The blades used in conventional electric razors and hair clippers are made of electroformed nickel or thin stainless steel, so if used for a long time, they will discolor due to sweat and other factors, reducing the product's value. In particular, the IIj'j product of the sliding surface increases due to wear due to sliding friction between the outer cutter and inner cutter, resulting in a decrease in sharpness, a large frictional resistance, a large sliding load, and an increase in power consumption. It has its drawbacks. In order to improve this drawback, coatings of oxides and nitrides have been proposed, for example, as shown in Japanese Patent Application Laid-Open No. 52'-92655, but these coatings do not directly coat the blade surface. Even if these were directly coated, sufficient adhesion to the surface of the outer blade could not be obtained, and they were likely to peel off due to sliding or the like. This is because when the film is formed, sulfur diffuses on the surface of Ni electroformed blades and carbon localizes on stainless steel blades due to the effects of heat, resulting in weak adhesion between the film and the underlying substrate, resulting in poor wear resistance. Both the corrosion resistance and the corrosion resistance were insufficient.

[Summary of the invention and examples]

This invention solves the above-mentioned drawbacks of the prior art.
In forming a nitrogen compound film on at least the sliding surface of the blade, the purpose is achieved by forming a base metal film on the surface of the blade and then forming the nitrogen compound film on the base metal film. be. The base metal film is selected from titanium, nickel, zirconium, chromium, aluminum, or an alloy thereof, and the nitrogen compound film is selected from titanium, zirconium, chromium, nickel, aluminum, or an alloy thereof. It is best to do so.

Further, as a method for forming the base metal film, methods such as a vacuum evaporation method, an ion blating method, a direct current sputtering method, a high frequency sputtering method, and a magnetron sputtering method can be adopted. On the other hand, the nitride film can be formed using methods such as ion blasting, direct current sputtering, high frequency sputtering, magnetron sputtering, and plasma CVD.In the sputtering method, the ratio of argon gas to nitrogen gas and the power are controlled. By this, a desired nitrogen content can be obtained. On the other hand, in the ion blating method, the nitrogen content is controlled by controlling the ratio between the precipitation rate of the metal material and nitrogen or ammonia.

In particular, when using the high frequency sputtering method, the total gas pressure of argon and nitrogen gas is preferably 0.003 to 0.3 Torr, and discharge does not occur below 0.003 Torr, and Q
, 3 Torr or more, the discharge becomes unstable. In addition, the high frequency power is preferably 1 to 5 S/clr, and I W/cut
Below 5 tJ/c, the precipitation rate is too slow and the efficiency is poor.
At nf or more, the precipitation rate hardly increases, and the target temperature and substrate temperature only increase, which causes an adverse effect such as a decrease in the mechanical strength of the blade base material.

From the viewpoint of corrosion resistance and wear resistance, the thickness of such a nitride film is preferably in the range of 100 to 300,000.
Below 0 Å, the effect as a film is poor;
If it is more than that, the outer cutter will be deformed, which is not desirable.

In particular, a range of 300 to 100,000 people is desirable.

On the other hand, the thickness of the underlying metal film is preferably in the range of 20 to 20,000 from the viewpoint of adhesion and abrasion resistance; if it is less than 20 Å, it will not be effective as a film, and if it is more than 20,000 Å, the abrasion resistance will be impaired. Undesirable. Especially 50-1
A range of 0,000 people is desirable.

Examples of the present invention will be described below.

Example 1: Figure 1 is a schematic structural diagram of the high-frequency sputtering apparatus used in Example 1. In the figure, 1 is argon gas, 2 is a target, Ni metal, and 3 is an electric shaver consisting of a nickel electroformed blade. blade, 4 is a high frequency power supply, 5 is argon gas,
6 is nitrogen gas, 7 is titanium target, 8 is heater, 9
9' is the exhaust.

By holding the outer blade 3 of an electric shaver made of a nickel electroformed blade and evacuating the inside of the processing container 10, 5×1
After reducing the pressure to below O-6 Torr, argon gas was introduced to keep the pressure constant at 0.05 Torr, and sputtering was performed under the condition that the output of the high frequency power source 4 was 3 W/cJ to form a 0.2 μ thick nickel film. Next, the reactor was transferred to a processing container 11, and after the pressure was similarly reduced to 5×10−6 Torr or less, argon gas and nitrogen gas were introduced. Heater 8
heated to about 100℃, high frequency power 3W/crA,
Sputtering was performed under the conditions of argon gas pressure of 2.7 x 1O-2 Torr and nitrogen gas pressure of 3 x 1O-3 Torr to form a titanium nitride film with a thickness of 0.3μ. Note that the composition ratio of titanium and nitrogen in this film was 1:0.7. Also the second
The figure shows the cross-sectional structure of the outer blade.

Example 2: Target 2 in Example 1 was replaced with Ni, and T
i, Cr, Zr and AI! A base metal film and a nitride film were formed in the same manner as in Example 1 except that .

Example 3: In place of the titanium target 7 of Example 1, N
Using i target, argon gas pressure 2.5 x 10
-2 Torr, nitrogen gas pressure 5 X 1O-3 Torr
A base metal film and a nitride film were formed under the same conditions except that . The composition ratio of Cr and nitrogen in this nitride film is 1:0.
．． It is 8.

Example 4: In place of the titanium target 7 of Example 1, N
Using i target, argon gas pressure 2.5 Xl0-
A base metal film and a nitride film were formed under the same conditions except that the pressure was changed to 2 Torr and nitrogen gas pressure to 5 Xl0-3 Torr. The composition ratio of Ni and nitrogen in this nitride film is 1:0.9
It is.

Example 5: In place of the titanium target 7 of Example 1, Z
A base metal film and a nitride film were formed under the same conditions except that an r target was used. The ratio of Zr to nitrogen in this nitride film is 1:0.9.

Example 6: In place of the titanium target 7 of Example 1, A
Argon gas pressure 2.6 x IF using A-tuber
2Torr, nitrogen gas pressure/4 x 1O-3Torr
A base metal film and a nitride film were formed under the same conditions except that . The composition ratio of An and nitrogen in this nitride film is 1:1.
It is.

Comparative Example 1: A nitride film was formed in the same manner as in Example 1 except that the step of forming the base metal film was omitted.

Comparative Example 2: A nitride film was formed in the same manner as in Example 3, except that the step of forming the base metal film was omitted.

Comparative Example 3: A nitride film was formed in the same manner as in Example 4, except that the step of forming the underlying metal film was omitted.

Comparative Example 4: A nitride film was formed in the same manner as in Example 5, except that the step of forming the underlying metal film was omitted.

Comparative Example 5: A nitride film was formed in the same manner as in Example 6, except that the step of forming the base metal film was omitted.

Comparative Example 6: The Ni electroformed blade used in Example 1 was used as is.

〔Effect of the invention〕

An electric shaver was assembled using the outer cutter produced above, and the drive current was measured, and the results were compared with the measurement results of the drive current after using the shaver for 150 hours. The results are shown in Table 1.

Table 1 As can be seen from this table, the products on which the underlying metal film was formed were in good condition with almost no increase in drive current observed even after 150 hours of use.

Furthermore, if the nitride film 14 is formed not only on the drive surface but also on the side that comes into contact with the skin as shown in FIG. 3, there is an effect that the nickel surface will not fade or discolor. moreover,
A nickel electroformed blade was used as the outer blade base material, but Ni-Co
A similar effect can be obtained by using alloy electroforming or stainless steel thin plate.

In addition to the outer blade of an electric shaver, it can also be applied to the inner blade, the movable blade of an electric clipper, a fixed blade, a lawn mower blade, etc.

As described above, according to the present invention, in forming a nitrogen compound film on at least the sliding surface of the blade, a base metal film is formed on the surface of the blade, and then the nitrogen compound film is formed on the base metal film. Therefore, even if the blade is used for a long time, an increase in drive current can be suppressed, and a blade with a long life can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of an example of a high-frequency sputtering device for implementing the present invention, FIG. 2 is an enlarged cross-sectional view of the outer blade of an electric shaver implementing the present invention, and FIG. 3 is another embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view of the outer blade of the electric shaver as an example. 12...Blade 13...Base metal film 14...Nitrogen compound film. Representative applicant Kyushu Hitachi Maxell Co., Ltd. Representative Fuku
Takashi Hara −

Claims (3)

[Claims] (1) A blade characterized in that in forming a nitrogen compound film on at least the sliding surface of the blade, a base metal film is formed on the surface of the blade, and then the nitrogen compound film is formed on the base metal film. . (2) The blade according to claim 1, wherein the base metal film is selected from titanium, nickel, zirconium, chromium, aluminum, or an alloy thereof. (3) As the nitrogen compound film, titanium, zirconium,
The blade according to claim 1, characterized in that a nitride made of chromium, nickel, aluminum, or an alloy thereof is used.