JPS605657B2 - Outer blade for electric razor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an outer blade for an electric razor manufactured by the lightning method.

Outer blades for electric razors are manufactured using a variety of methods, including the Ryusei method, press punching method, and corrosion punching method, and the outer blades manufactured using any of these methods can be used as outer blades for electric razors. The required qualities include strict conditions such as good sharpness, maintaining sharpness for a long period of time, resistance to tearing, and resistance to corrosion.

There are many problems in completely satisfying the above required quality for outer blades made using various manufacturing methods, and even with the Kamesen method, which is currently becoming the mainstream manufacturing method,
It is hard to say that I am completely satisfied with the aircraft. Conventionally, the present invention has mostly been made of pure Ni. By using a Ni-Co alloy for the outer blade of an electric razor, it was possible to solve the problems that existed in the outer blade manufactured by the lightning method, and to improve the overall performance of the outer blade. Currently, Ni electric fins from Watt baths or
Ni coins made from sulfamate salts are often used.

The former grade is widely known and contains nickel sulfate as its main component, but as it exhibits high tensile stress as it is, it is not suitable for electrical coins that require peeling, so it is usually 1.3.
By adding 6-sodium naphthalene tri-sulfonate, 1.5-sodium naphthalene di-sulfonate, or an organic gloss containing sulfur (S) such as saccharin, stress can be adjusted, gloss can be increased, and hardness can be improved. is increasing. On the other hand, N from the latter nickel sulfamate
In the case of lightning nickel sulfamate itself, the nickel sulfamate itself has low stress and gloss even without using an organic brightener containing S, and is essentially suitable for kasumi coins, but the hardness is Hv = 2.
Since the degree of saturation is 0, the general usage is to increase the gloss, increase the hardness, and make the stress more compressive by adding an organic brightener that also contains S. In the above two bath examples, the amount of sulfur from organic additives containing sulfur in the crystal lattice of the deposited Ni is usually 0.0
1 to 0.1% (weight ratio; the following percentage numbers represent weight ratios) is co-refracted, and the sulfur causes a large strain in the crystal lattice and acts to increase hardness. When this sulfur-containing Nj electrodeposit is used as an outer cutter, the Ni is corroded by the action of sweat on human skin, and the Nj is dissolved and hydrogen is generated, and this hydrogen converts the sulfur in the Ni into After expelling Ni, Ni remains in the cracks that have formed and spreads from crack to crack, making the Ni electrodeposit extremely brittle.This phenomenon is called the hydrogen arm phenomenon. When this phenomenon occurs in the outer cutter, the outer cutter becomes extremely brittle and the possibility of breakage increases.Also, this phenomenon progresses even more easily when chlorine ions coexist.Furthermore, this hydrogen embrittlement At the same time, when using an electric razor, repeated stress is applied to the outer blade due to the pressing force, and fatigue of the outer blade metal further progresses due to wear and the like caused by continuous rotation of the inner blade.

In the present invention, Co ions are artificially added to the open casting bath to
By using it as a -Co alloy outer cutter, it has become possible to solve the above problems.

When Co ions are present in the Ni casting bath, Ni and Co are precipitated simultaneously in the kamekimono. When two different atoms, Ni and Co, are bonded together, the tensile strength increases due to solid solution strengthening.
The hardness increases and it has enough strength to be used as an outer cutter. Ni-Co alloys that have been solid-solution strengthened with Co additives to increase their strength commonly suffer from corrosion due to N containing S.
Although it is similar to i, in this Ni-Co alloy electrodeposit, "If Co is contained in an amount of 25% or more, S is 0.01 to 0.01".
Even if Co coexists at about 0.1%, the effect of S is negated by the addition of Co, and hydrogen embrittlement hardly occurs. on the other hand"
If S is 0.01% or less, the presence of Co amount is 25%.
It has the characteristic that hydrogen embrittlement does not occur completely even if it is below.

Although the presence of S gives good properties to the electrodeposited material such as gloss and leveling, it also gives undesirable properties such as deterioration of heat resistance above 300°C and deterioration of general corrosion resistance to sweat, alcohol, etc. It has the following characteristics. As this limit,
S is to be 0.1% or less. In addition, it was found that the effect of adding Co tends to significantly reduce the wear caused by contact between the outer cutter and the inner cutter. The outer blade is now possible.When used as the outer blade of a flea razor,
It provides a strong outer blade that will not break even if a force stronger than the external force is applied to the extreme part of the outer blade when shaving. In addition, the low flea adhesion stress means that the outer blade does not deform after the outer blade is completed, and can maintain good adhesion with the inner blade, resulting in an excellent shave. We will describe an example of the turtle case that forms , and its characteristics.

A grade whose main component is nickel sulfamate is capable of haze deposition at high current densities, so it is beginning to be used as a high-speed Ni grade. The Ni-Co alloy outer cutter produced by this method had good hydrogen embrittlement resistance.An example of the bath components is shown below.Nickel sulfamate 550
~700 evening/so nickel chloride
10 ta'〆shelf Acid 40 t/d Cobalt sulfamate 9~30 〆〆pH=3.5~4.5 Temp=55~70℃ Current density=7~3 ships/d By using the Ni-Co alloy and performing dew deposition in a well-known outer blade manufacturing process, an outer blade made of a Ni--Co alloy containing Co in a range of about 25 to 35% can be manufactured.

This nickel/cobalt sulfamate has sufficient luster and hardness to be used as an outer cutter without using an organic brightener containing S, and the electrodeposition stress is relatively low.
Basically suitable for manufacturing outer blades. The characteristics of the outer blade when this proverb is used are as follows. By adding I Co to the deposit, Hv can be increased to 525, and the deposit has almost the same tensile strength as the electrodeposited material of the same hardness from Watt grade, and the ductility is comparable to Watt grade. Because it is more expensive than the turtle kimono, it is ranked as a sotoblade.

2. If an organic brightener containing S is not used in this case, the S content will be 0.01% or less, and it will not form arms even when heated to 300°C or more, making it possible to perform processes such as welding.

3 By adding an organic brightener containing S to this grade, it becomes even brighter than the base Ni-Co alloy.
The hardness increases and the tortoise stress becomes compressive, making it more suitable for lightning mirrors.

Furthermore, even with the addition of S, hydrogen arms do not occur due to the coexistence of Co, which is an excellent property. In this sulfamate bath, as the amount of Co added increases, the electrodeposition stress changes from compressive stress to tensile stress, and gradually becomes unsuitable for use as coins.
In addition, as the amount of Co in the deposit increases, the general corrosion resistance and properties also decrease, so it is better to keep the amount of Co as low as possible.Also, the maximum strength of the Ni-Co alloy is obtained at 35% Co. , it becomes possible to eliminate hydrogen embrittlement25
% to 35% is a suitable range. In particular, if the Co content is less than 25%, the hardness of the exposed material will fall below HV450, which is the limit that makes it impossible to use it as an outer blade for electric razors depending on the military rating. It shall be 25%. The next example is Ni-Co, which is generally called Wisberg type, among the cases whose main components are nickel sulfate and cobalt sulfate.
Indicates alloy rating. The rich components and exposure conditions are as follows. Nickel sulfate 240 m/g Nickel chloride 45 m/g Nickel sulfate Acid 3M/nickel formate 10 m/g Cobalt sulfate
5-5M/〆1.5 Naphthalene di-sulfonate sodium 7 evening/evening PH = 4.0-4.2 Temp = 40-50 pm○ Current density = 2-8 A/d〆In this case, Co A Ni-Co alloy containing 25 to 35% of S is exposed, and since this Weisberg bath exhibits strong tensile stress in the absence of S-containing organic additives, it inevitably contains S. It is very difficult to sharpen the outer blade without using an organic brightener.

However, due to the presence of Co, it also has the characteristic that arming does not occur. From the viewpoint of corrosion resistance and strength, a range of 25 to 35% is suitable for Co. As mentioned above, the outer blade manufactured by Kasumisen is coated with 25 to 35% Co.
By using a Ni-Co alloy that contains S in the range of 0.1% or less, it is possible to suppress the occurrence of hydrogen embrittlement due to the coexistence of S and Co in the lightning kimono. It is now possible to create an outer cutter with improved durability and corrosion resistance.

Claims (1)

[Claims] 1 Co 25-35% by weight, S 0.1 by weight
An outer blade for an electric razor made of an electrodeposited Ni-Co alloy containing % or less of Ni-Co.