JPS5932552B2 - 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 made of an electrodeposited nickel-manganese-cobalt-sulfur alloy.

The outer blades for electric razors are generally made by electrodeposition from an electrolyte containing nickel ions.

An organic brightener containing a sulfur atom, such as saccharin, naphthalene trisulfonic acid sorter naphthalene disulfonate sodium, etc., is added to the electrolytic solution to impart surface gloss to the formed outer blade made of nickel electrodeposit. At the same time, internal stress is reduced to prevent peeling and deformation during electrodeposition. It is well known that the use of such organic brighteners generally increases the hardness of the outer blade and prevents wear caused by sliding of the opposing blade (inner blade), but on the other hand, the heat generated by sliding during use The drawback was that when the metallographic structure was gradually heated to high temperatures, the metallographic structure changed and the toughness was severely impaired. For example, if a material with an initial Vickers hardness of about 550 is heat-treated at 230° C. for 30 minutes, its toughness deteriorates to such an extent that the Vickers hardness cannot be measured, and it becomes susceptible to cracking. In this way, with conventional outer blades, the effect of sliding heat during use tends to become noticeable at around 230°C, and this means that the heat-treated outer blades mentioned above actually crack during use. This can be inferred from the fact that the cross-sectional structure is very similar. The purpose of this invention is to provide an outer blade for an electric razor that is free from such drawbacks and has excellent thermal stability, and is formed by electrodeposition from an electrolytic solution containing nickel ions and a brightening agent added thereto. An outer blade for an electric razor, characterized in that an organic brightener is used as the brightener and cobalt ions and manganese ions are included in the electrolyte to form a nickel-cobalt-manganese-sulfur alloy electrodeposit. It is.

FIG. 1 shows the thermal change in hardness of a nickel-manganese alloy electrodeposited material having a 0.6% by weight atomic content.

This alloy contains 0.3 weight sulfur. As is clear from this figure, the initial hardness hardly decreases even at high temperatures of 300°C or higher. Unlike the conventional outer cutter, which cracked during hardness measurement, no major changes in the microstructure due to deterioration of toughness were observed. This is because S turns into MnS before NiS is formed by heating and grain boundary cracking occurs. Such good thermal stability is observed when the manganese atom content and sulfur content are 1:1 to 5:1.

On the other hand, in an outer cutter made of this type of alloy electrodeposit, it is necessary to increase the hardness, so it is necessary to add a certain amount of Co or more. Increasing the content of manganese atoms improves the initial hardness, but if this amount is too large, the internal stress of the outer cutter becomes large and there is a risk that cracks may occur during electrodeposition formation. In this invention, cobalt ions are included together with manganese ions in the electrolytic solution to form a nickel-manganese-cobalt-sulfur alloy electrodeposit, thereby maintaining the hardness at about Hv5OO and making it suitable as an outer cutter.

Figure 2 shows a comparison of the hardness and thermal change of the outer cutter made of such a ternary alloy electrodeposit, and the curve -
1 has cobalt atom content of 15 weight? Curve - is for a ternary alloy electrodeposit with the same content of 35% by weight. Curve 1 is for an electrodeposit of nickel only and no CO, and the manganese atomic content is 0 in both cases. .3 weight? And the sulfur atomic weight is 0.1 weight? It is.

From this figure, it is clear that the initial hardness can be increased by including the cobalt atomic weight (6) This increase phenomenon is observed when the cobalt atomic content is 10% by weight or more, and becomes more pronounced as the content is increased. Become.

Also, as is clear from the same figure, the ternary alloy electrodeposited Kobano k
If the carbon atom content is too large, the toughness will decrease and the internal stress will increase, which may lead to peeling during electrodeposition, so it is usually desirable to keep it within the range of 10 to 35% by weight.

Within this range, the thermal stability of at least the conventional outer cutter made of nickel electrodeposited material can be sufficiently improved. When forming an outer cutter made of a Nickel-manganese-cobalt-sulfur alloy electrodeposit, the manganese atomic content (usually 0.01
~0.5 weight? and the cobalt atom content is usually 10
~35 weight? It is desirable to limit the manganese atom content to 0.01 to 0.5% by weight, which is 0.01wt%.
No effect was seen in improving heat resistance at 0.5wt% or less.
If it exceeds this, the electrodeposition stress will become too high and electroforming of the outer blade will become impossible. In addition, the Mn:S ratio was limited to 1:1 to 5:1 (if S is less than 5:1, the effect of reducing electrodeposition stress is small, and the effect of increasing electrodeposition stress due to the addition of CO and Mn is It cannot be canceled out, and basic hardening is also low.
on the other hand. If the S content is more than 1:1, there is a limit to the amount of 6Mn added, so it is impossible to prevent a decrease in heat resistance due to an increase in S content. Therefore, this was set as the upper limit. Table 1 summarizes these relationships. In the table, heat resistance is 300℃
x If the number of bends decreased by 90x in a 50μ metal foil after heating for 10 minutes, it was marked as ×, and if there was no change, it was marked as ○. In addition, the electrodeposition stress was measured by electrodeposition of the actual outer blade. ○ for those with a stress range that allows electroforming. Impossible items were marked as ×. The strength is defined as 0 if the hardness is Hv2450 or more, which is basically necessary for an outer cutter, and X if it is less than that. There are acid keda and sodium naphthalene disulfonate.

In addition, appropriate manganese salts and cobalt salts depending on the type of electrolytic solution are added and dissolved to contain manganese ions and cobalt ions in the electrolytic solution.

The manganese atom content or cobalt atom content in the alloy electrodeposit increases approximately in proportion to the ratio of manganese ions or (gocobalt ions) to nickel ions in the electrolyte.

Therefore, the manganese salt and cobalt salt to be added to the electrolyte are determined by considering the nickel ions dissolved in the electrolyte and the electrodeposition conditions such as current density and stirring conditions, and the manganese atomic content in the electrodeposited alloy of 6. The amount to be used may be determined so that the content of cobalt atoms becomes a desired proportion. When a known electrodeposition method is applied to the electrolytic solution containing nickel ions, manganese ions, or cobalt ions and an organic brightener added to the electrolyte prepared in this manner, it is possible to produce an electric motor with the above-mentioned excellent performance. An outer blade for a razor is obtained. The outer cutter for an electric shaver of the present invention will be specifically described below based on examples.

Example 1 A nickel-cobalt-manganese-sulfur alloy was electrodeposited to a thickness of 120 μm using the above electrolytic solution and electrodeposition conditions. 16.1,. Two types of outer blades for electric razors, No. 46.2, were obtained.

Af). Is the cobalt atom content of the outer blade of No. 1 15 by weight? , the manganese atom content is 0.3 weight 70, sulfur is 0.170, and the cobalt atomic content of the outer blade of Taki 2 (35 weight 70
The manganese atom content was 0.3% and the sulfur content was 0.170.

The hardness of these outer cutters and their thermal changes were investigated and the results were as shown in Figure 2. Curve-I in the figure is . /Ff) In the case of 1, the curve - is the case of waterfall 2. In addition, in FIG. 2, the curve - shows the case where the manganese atom content is 0.3 wt. without adding CO by the method of Example 1. The outer blade made of a Nickel-manganese monosulfur alloy electrodeposited material is shown for reference.

[Brief explanation of drawings]

FIG. 1 is a characteristic diagram showing changes in hardness and heat of a Nickel-manganese-sulfur alloy outer cutter having a manganese atomic content of 0.6% by weight.

Claims (1)

[Claims] 1 Co10-35wt%, Mn0.01-0.5wt
%, and the weight ratio of Mn atom content and S atom content is 1:1
An outer blade for an electric razor having an electrodeposited alloy composition of ~5:1 with the remainder being Ni.