JPS6164871A - Outer edge of electric razor - Google Patents

Abstract

PURPOSE:To obtain a titled outer edge which is excellent in corrosion resistance, wear resistance, and appearance by forming an Sn-Co alloy layer on the least the outside surface of an outer edge manufactured by an electrocasting method by using Ni as a base material, and forming an oxide film or a hydroxide film by an oxidizing treatment. CONSTITUTION:An Sn-Co alloy layer 9 is formed by about 0.5-3mum on at least the outside surface of an outer edge 3 manufactured by using an electrocasting method by using Ni as a base material. Subsequently, the surface layer part of the Sn-Co alloy layer 9 is brought to oxidizing treatment by using a method by an oxygen gas plasma, chemical conversion treatment, a method using anodic oxidation, etc., and an oxide film or a hydroxide film is formed. This oxidation depth is set to a range of about 0.2-1mum, and it is desirable that said depth does not exceed a thickness of said alloy layer 9. Also, as for thickness of said alloy layer 9, it is desirable that it is set to the extent that sagging or roundness is not generated in a razor edge 10.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the improvement of an outer cutter manufactured by electroforming, and its purpose is to provide an outer cutter with excellent corrosion resistance, wear resistance, and appearance. shall be.

[Conventional technology]

The quality required for the outer blade for electric razors is strict, such as good sharpness, long-term sharpness, resistance to corrosion, and good appearance. There are many problems in satisfying all quality requirements, and it is difficult to say that even the electroforming method, which is the mainstream manufacturing method at present, can achieve satisfactory quality.

[Problem that the invention seeks to solve]

Currently, nickel (Ni) electroformed outer blades have reduced electrodeposition stress.

Since organic additives containing sulfur are required for the purpose of increasing gloss and hardness, the electrodeposit contains sulfur, which causes weaknesses as an outer cutter such as decreased corrosion resistance and toughness. characteristics. Recently, alloy electroformed blades such as Teha, nickel-cobalt, nickel-cobalt-phosphorous, nickel-manganese, and nickel-tungsten have been developed.
Compared to the Ni electroformed blade, the heat resistance is only slightly improved, the corrosion resistance, toughness, abrasion resistance, etc. are almost the same, and the gloss is slightly inferior.

[Means and effects for solving the problems] The present invention can solve the above-mentioned drawbacks of the conventional technology.
A tin-cobalt (Sn-Co) alloy layer is formed on a part of the outer cutter made of a single element or Ni and an alloy as described above, that is, the surface including the outer surface that comes into contact with the skin or the inner surface that makes sliding contact with the inner cutter, and then oxidizes the outer cutter. The purpose is achieved by forming an oxide film or hydroxide film through treatment.

The layer thickness of the 5n-Co alloy layer is approximately 0.5 to 3 μm (7,
The oxidation depth is in the range of 0.2 to 1 μm, and it is particularly important not to exceed the above-mentioned layer thickness.

If the layer thickness is exceeded, it will reach the Ni alloy electroformed outer blade and the S
It weakens the bonding force between the n-Co alloy layer and Ni, and may also make Ni brittle, and if it is less than 0.2 μm, pinholes will occur, making it difficult to maintain long-term effects.

In addition, by forming an oxide film on the surface of the 5n-Co alloy layer, the surface electrical resistance is increased and the 5n-Co alloy layer becomes a nonconductor.
It is possible to prevent the embrittlement caused by the electrode battery that occurs between -Go or in 5n-Co itself, but in this case, 5n-Co
Even the junction between the n-Go alloy layer and Ni can be oxidized.

Methods for forming the film include a method using oxygen gas plasma, a method using chemical conversion treatment, and a method using anodic oxidation. Since the electroformed outer cutter has poor heat resistance, it cannot be subjected to oxidation treatment by heating in an oxygen atmosphere, so the above three methods are superior. In particular, the method using oxygen gas plasma is excellent as a method for forming a dense and thick oxide film while keeping the outer cutter at a low temperature.

Further, the 5n-Co alloy layer is advantageous because it is easier to form a film than Ni or its alloy electrodeposited material, and it can be colored in various arbitrary colors depending on the conditions of the oxygen gas plasma method, and the appearance is improved.

As a plasma oxidation method, there are a method of applying high frequency power to the outer cutter (FIG. 1) and a method of applying a DC voltage (FIG. 2), both of which are effective.

It is also effective to use microwaves or the like. When applying the high frequency shown in Figure 1, the 02 gas pressure is 3 to 3000 m
A range of Torr is desirable, and at 3 m Torr or more, no discharge occurs and no plasma is generated. On the other hand, 3000m T
If it exceeds orr, the Sn--Co oxide becomes a white powder, which is not desirable. Further, 10 to 500 mTorr is extremely desirable. High frequency power (13,56MHz) is
0.3~5 W/co! is desirable, 0.3 W/cn
If it is less than i, the formation of an oxide film is slow, and if it is more than 5 W/cn1, the temperature of the outer cutter increases and the toughness is lost, which is not desirable. In the latter case, deterioration in toughness can be prevented by cooling the sample in some way, but in this case, there are disadvantages such as increased sputtering effect and poor film quality. In particular, a range of 0.5 to 3 W/c4 is desirable.

Before performing plasma oxidation, argon (Ar),
A uniform oxide film can be obtained by cleaning the surface with plasma of a gas such as krypton (Kr), helium (He), nitrogen (N2), or hydrogen (He). It is desirable to carry out such treatment because it eliminates defects such as stains and other defects in appearance.

FIG. 3 is a cross-sectional view of the lip when the entire outer cutter 3 is coated with a 5n-Go gold alloy. If the Sn--Co alloy layer is too thick, there is a risk that the cutting edge 10 will become sagging or rounded, but a thick oxide layer provides the best corrosion resistance and wear resistance.

Figure 4 shows 5n-G after secondary electroforming in a known electroforming method.
This is a diagram when tertiary electroforming is performed using o gold alloy, and the cutting edge 1
There is no worry that 0 will come off, but Ni and its alloys
5 because it is difficult to form a film compared to n-Cro alloy.
The oxide or hydroxide layer on the surface 12 not covered with the n-Co alloy layer 11, that is, the inner surface that makes sliding contact with the inner cutter (not shown), is slightly thinner, and the corrosion resistance and abrasion resistance are slightly inferior to the above case.

The cutting edge 10 of the outer cutter is in contact with hair and is under a large stress, and the recessed part 13 of the inner surface 12 tends to accumulate hair debris and sebum. It tends to be large in part I3. -After electroforming is peeled off, 5n
- Co alloy electroforming 14 is performed, and normal secondary electroforming 1 is applied on top of that.
5 and then 5n-Co alloy electroforming 16 is performed again to form a three-layer structure as shown in FIG. When this is oxidized,
There is no need to worry about the cutting edge 10 sagging, the corrosion resistance is also good, and it is the best overall.

〔Example〕

Examples will be described below.

FIG. 1 is a schematic configuration diagram of the plasma oxidation apparatus used in Example 1, where 1 is oxygen (02) gas, 2 is Ar, K
r, He, H2, N2 gas, 3 is an outer blade, 4 is a high frequency power supply, and 5 is an exhaust gas.

Figure 2 shows another plasma oxidation device, where the same symbols as in Figure 1 indicate the same parts, 6 is a plasma generation electrode, 7 is a power source such as DC, AC, radio frequency (RF), etc., and 8 is a DC power source. shows.

Example 1 Outer blade 3 (see Figure 3), in which a 5n-Co alloy layer was electroformed on the entire surface of a Ni outer blade containing 0.045 wt% sulfur (S), was set in the plasma oxidation apparatus shown in Figure 1. I
After evacuating to a vacuum level of 10' Torr or less, Ar
Gas was flowed at a flow rate of IO5CCM, and the inside of the tank was set at 50mT.

rr, high frequency power 4 was applied at 0.5 W/crd, and the treatment was performed for 30 seconds. I X 1O again
Exhaust below -3Torr and 20SCC of 02 gas? 'l
The temperature in the tank was set to 300 mTorr, and the high frequency power 4 was varied from 0.3 to 5 W/crl, and the treatment was performed for 10 minutes.

Example 2 Using the same outer cutter 3 as in Example 1, performing the same pretreatment with the meter gas in the same device, keeping the high frequency power 4 constant at L W / cl, and changing the 02 gas pressure from 3 to 3000 m Torr. A plasma oxidation treatment was performed for 10 minutes.

Example 3 5n- was applied only to the surface of the Ni-35wt%Co alloy electroformed outer blade.
Co alloy layer electroforming was performed using the same equipment as in Example 1, the same pretreatment was performed, and high frequency power IW/cffl, 02 gas pressure 1
Plasma oxidation was performed at 00 mTorr for 10 minutes.

Example 4 A Ni electroformed blade containing 0.045 wt% S was treated in the same manner as in Example 3.

Comparative Example IS Ni electroformed outer blade containing 0.045 wt% S and not subjected to oxidation treatment.

Comparative Example 2 Ni-35wt%Co alloy electroformed outer blade that was not oxidized.

Comparative Example 3 An outer cutter containing 0.045 wt% of S was plasma oxidized under the same conditions as Example 3 without electroforming the 5n-Co alloy layer.

Comparative Example 4 A Ni 35 wt% Co alloy electroformed outer blade was plasma oxidized under the same conditions as Example 3 without electroforming the Sn-O alloy layer.

In plasma oxidation, the formation of an oxide layer occurs rapidly in the initial minute, and tends to be almost saturated after 10 minutes, so the processing time for all plasma oxidation was set to 10 minutes.

Table 1 shows the characteristics of each.

In Table 1, the evaluation of corrosion resistance and abrasion resistance is expressed in the order of A, A', B, and C from excellent to poor.

As is clear from Table 1, plasma oxidation resulted in good corrosion resistance and very good wear resistance. In addition, the outer cutter can be colored and has a flawed appearance.The outer cutter is made of Ni-Mn.

It goes without saying that similar results can be obtained using Ni alloys such as tlli-W. Chemical conversion treatment and anodic oxidation produce not only an oxide film but also a hydroxide film, which also improves corrosion resistance and wear resistance.

However, it cannot be colored. The 5n-Co alloy has the advantage that it is easier to form an oxide film during chemical conversion treatment than Ni and its alloys.

As described above, at least the outer surface of the outer cutter is coated with Sn.
An outer cutter coated with a -Co alloy layer and then subjected to oxidation treatment to form an oxide film or a hydroxide film has excellent corrosion resistance and wear resistance. In particular, the oxidation treatment method using plasma oxidation,
It has excellent coloring and film thickness, and is advantageous because the oxide has a small coefficient of friction. It goes without saying that the same results can be obtained when a direct current power source or microwave is used as the plasma oxidation method.

[Brief explanation of drawings]

1 and 2 show a plasma oxidation apparatus for carrying out the present invention, and FIGS. 3, 4, and 5 show cross-sectional shapes of outer cutter ribs in embodiments of the present invention. 3...Outer blade 9, 11. 14. 16...5n-Co alloy layer. Representative applicant Kyushu Hitachi Maxell Co., Ltd. Representative Fuku
Takashi Hara Futami 31D 7! Fda design 51 children

Claims (1)

[Claims] (1) A tin-cobalt alloy layer is formed on at least the outer surface of an outer cutter made of nickel by electroforming, and an oxide film or hydroxide film is formed by oxidation treatment. The outer blade of an electric razor.