JPS629676B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for manufacturing an outer blade for an electric razor made of an electrodeposited alloy of nickel and manganese or tungsten. In a previous study, the inventors found that an outer blade made of a nickel-manganese alloy electrodeposited material was electrodeposited by adding manganese ions to an electrolytic solution containing nickel ions and adding an inorganic brightener to the electrolytic solution. However, it has been discovered that the initial hardness does not decrease significantly even when exposed to high temperatures due to sliding heat during use, and has excellent thermal stability. In other words, in conventional outer blades made of nickel alone, which is electrodeposited from an electrolytic solution containing nickel ions and an organic brightener containing sulfur atoms, the effect of sliding heat is approximately
It appears at around 230℃, and for example, if a material with an initial Bitkers hardness of about 550 is heat-treated at 230℃ for 30 minutes, the metallographic structure will change and the toughness will deteriorate to the point where the Bitkers hardness cannot be measured, making it far from practical. In the outer cutter made of the nickel-manganese alloy electrodeposit, no extreme decrease in hardness is observed even at temperatures of about 300°C, and no major changes in the microstructure accompanied by deterioration of toughness are observed. However, this existing outer cutter generally tends to have low initial hardness, and although this problem can be avoided to some extent by increasing the manganese atom content, in this case the internal stress increases and peeling occurs during electrodeposition molding. There was a risk of cracks, deformation, etc. In the case of making such a nickel-manganese alloy electrodeposit, this invention selects and uses an organic brightener containing sulfur atoms, which has been used in the conventional electrodeposit of nickel alone, as a brightening agent. This was done after it was found that by incorporating the above-mentioned sulfur atoms into the material, an outer cutter with high initial hardness and low internal stress could be obtained, and would not have any adverse effect on the improved thermal stability. be. Figure 1 shows the thermal change in hardness of an outer cutter made of a nickel-manganese alloy electrodeposit with a manganese atomic content of about 0.5% by weight, and curves - and 0.08 in the figure have sulfur atomic contents of 0.04% and 0.08%, respectively. In the case of the outer cutter manufactured by the method of the present invention in weight percent, the curve - is the case of the previously proposed outer cutter using an inorganic brightener as the brightener. From this figure, it can be seen that the outer cutter manufactured by the method of the present invention has thermal stability comparable to that of the previously proposed outer cutter, and also has a very high initial hardness. Similar results show that the manganese atomic content
It is recognized when the concentration is 0.2% by weight or more, and the initial hardness at this time is at least 450 on the Bitkers scale.
This is a high value. FIG. 2 shows the relationship between the internal stress and the manganese atomic content of a nickel-manganese alloy electrodeposited material produced by the method of the present invention in which the sulfur atomic content ranges from 0.03 to 0.09% by weight. As shown in the figure, when the manganese atomic content is about 0.75% by weight or less, the internal stress of the outer cutter is extremely small, and cracks do not occur during electrodeposition molding, which is the case with existing outer cutters. It turns out that there is something. As described above, the present invention provides a method for forming an outer blade for an electric razor by an electrodeposition method from an electrolytic solution containing nickel ions and adding an organic brightener containing sulfur atoms to the electrolytic solution containing manganese ions. By making the outer cutter a nickel-manganese alloy electrodeposited material, and by including the above-mentioned sulfur atoms in this alloy electrodeposited material, and in particular by setting the cobalt atom content to usually 0.2 to 0.75% by weight, the initial An outer blade for an electric shaver has been obtained which has high hardness, low internal stress, no cracking or deformation, and excellent thermal stability. In further research, the inventors found that an electric shaver outer blade with such improved performance was obtained by using tungsten ions instead of manganese ions in the electrolyte.
It has been found that a tungsten alloy electrodeposit can also be obtained when sulfur atoms from an organic brightener are included in this alloy electrodeposit. Figure 3 shows the thermal change in hardness of such a nickel-tungsten alloy electrodeposit, and the curve -
The curve shows the case where the tungsten atom content is 20% by weight, the curve - shows the case where the same content is 35% by weight, and the sulfur atom content is 0.07% by weight in both cases. Apparently, a good thermal stability similar to that of the nickel-manganese alloy electrodeposit is obtained. The preferable tungsten atom content to obtain such thermal stability is usually 10% by weight or more, and the initial hardness at this time is as high as 450 or more on the Vickers hardness, similar to the case of the nickel-manganese alloy electrodeposit. . Also the tungsten atomic content is usually
The internal stress is small up to 40% by weight, and within this range there is no risk of problems such as cracks occurring. The electrolytic solution applicable to this invention includes various types of conventionally known electrolytes, and representative ones include Watt's bath and sulfamic acid bath. As the organic brightener containing sulfur atoms to be added to the electrolytic solution, any conventionally known brightener can be selected. Specific examples include saccharin, sodium naphthalene trisulfonate, and sodium naphthalene disulfonate. In addition to such organic brighteners, inorganic brighteners such as nickel formate and magnesium sulfate may also be used in combination. The amount of organic brightener used is usually such that the sulfur atom content in the alloy electrodeposit is 0.02 to 0.1% by weight, whether it is a nickel-manganese alloy electrodeposit or a nickel-tungsten alloy electrodeposit. It is sufficient. If too much is included, the outer cutter tends to become brittle, which is undesirable. Further, an appropriate manganese salt or tungsten salt depending on the type of electrolyte is added and dissolved in the electrolytic solution to contain manganese ions or tungsten ions in the electrolyte. The manganese or tungsten atomic content in the alloy electrodeposit increases approximately in proportion to the ratio of manganese or tungsten ions to nickel ions in the electrolyte. Therefore, in the former case, the manganese salt or tungsten salt added to the electrolytic solution should desirably be added to the alloy electrodeposit, taking into account the nickel ions dissolved in the solution and the electrodeposition conditions such as current density and stirring conditions. It may be used in such a proportion that the manganese atomic content is usually 0.2 to 0.75% by weight, and in the latter case preferably in such a proportion that the tungsten atomic content in the alloy electrodeposit is usually 10 to 40% by weight. When a known electrodeposition method is applied to the electrolytic solution prepared in this way containing nickel ions and manganese ions or tungsten ions and to which an organic brightener containing sulfur atoms is added, An outer blade for an electric razor having excellent performance can be obtained. This outer blade is made of nickel.
Those made of manganese alloy electrodeposit have mechanical strength, especially tensile strength, close to that of stainless steel, and those made of nickel-tungsten alloy electrodeposit have excellent wear resistance. The method for manufacturing the outer cutter of the present invention will be specifically explained below based on Examples. Example 1 Nickel sulfamate 105g/manganese sulfamate 10-80g/nickel bromide 5g/boric acid 40g/sodium naphthalene trisulfonate 5-20g/2-butyl-1,4-diol 0.1g/nickel formate 20g/PH 4 Bath temperature: 55°C Current density: 3A/dm ² Electrodeposited into a net shape using the above electrolytic solution and electrodeposition conditions according to a conventional method for about 3.6 hours, and formed the following No.
Outer blades for electric razors Nos. 1 to 9 with the sulfur atom content and manganese atom content shown in the table were obtained.

[Table] The physical properties of each outer cutter and the results of heat treatment at 300℃ for 0.4 hours and changes in hardness before and after heat treatment are shown in the second table.
Shown in the table.

[Table] Furthermore, various heat treatment temperatures were set for the outer cutters No. 5 and No. 6, and thermal changes in hardness were investigated in detail, and the results are shown in Figure 1. In the figure, the curve - is for No. 5, and the curve - is for No. 6. Furthermore, the internal stress of each outer cutter was investigated, and the relationship with the manganese atomic content is shown in Figure 2. Reference Example The electrolytic solution of Example 1 was made in the same manner as in Example 1 except that sodium naphthalene trisulfonate was not used, and the thickness was 120μ and the manganese atom content was
An outer blade for an electric razor made of 0.53% by weight of nickel-manganese alloy electrodeposited material was obtained. The results of investigating the thermal change in the hardness of this outer cutter are as follows:
It was as shown by the curve - in the figure. Comparative example Nickel sulfamate 450g / Nickel bromide 5g / Boric acid 35g / Sodium naphthalene trisulfonate 15g / 2-butyne-1,4-diol 0.1g / PH 4 Bath temperature 50-55℃ Current density 3A/dm ² Above An outer blade for an electric shaver made of only nickel electrodeposited was obtained using the same electrolytic solution and electrodeposition conditions as in Example 1. The Bitkers hardness of this outer blade is
523, but after heat treatment at 230°C for 30 minutes, cracks occurred during hardness measurement. Example 2 Nickel sulfamate 400g / Sodium tungstate 20-200g / Sodium citrate 10-100g / Boric acid 40g / Nickel bromide 5g / Nickel formate 20g / Satucalin 0.5g / Surfactant (Pitutress S) 3ml / PH 4.2 Bath temperature: 60°C Current density: 3A/dm ² Using the above electrolytic solution and electrodeposition conditions, electrodeposition was performed to a thickness of 120 μm in the same manner as in Example 1 to form No. 10 and No. 10, which were made of nickel-tungsten alloy electrodeposit. 11 two types of outer blades for electric razors were obtained. The tungsten atomic content of No. 10's outer blade was 20% by weight and the sulfur atomic content was 0.07% by weight, and the tungsten atomic content of No. 11's outer blade was 35% by weight and sulfur atomic content was 0.07% by weight. . The thermal change in hardness of these outer cutters was investigated and the results were as shown in FIG. In the figure, the curve - is No. 10, and the curve - is No. 11.
This is the case.

[Brief explanation of the drawing]

FIG. 1 is a characteristic diagram showing the thermal change in hardness of an electric razor outer cutter made of a nickel-manganese alloy electrodeposited material. This is the case of an outer cutter shown as a reference example different from that manufactured by the method of the present invention. Fig. 2 is a characteristic diagram showing the relationship between internal stress and manganese atomic content of an electric razor outer blade made of a nickel-manganese alloy electrodeposited material produced by the method of the present invention, and Fig. 3 is a characteristic diagram showing the relationship between the internal stress and manganese atomic content of the outer blade for an electric razor made of a nickel-manganese alloy electrodeposited material produced by the method of the present invention. This is a characteristic diagram showing the thermal change in hardness of the outer blade for electric razors made of electrodeposited nickel-tungsten alloy.
is the case where the content is 35% by weight.

Claims (1)

[Claims] 1. In forming an outer blade for an electric razor by an electrodeposition method from an electrolytic solution containing nickel ions and adding an organic brightener containing sulfur atoms to the electrolyte,
The electrolytic solution is impregnated with manganese ions or tungsten ions to make the outer cutter an alloy electrodeposit of nickel and manganese or tungsten, and the alloy electrodeposit contains the sulfur atoms. A method for manufacturing outer blades for electric razors. 2. The method for manufacturing an outer blade for an electric razor according to claim 1, wherein the sulfur atom content in the alloy electrodeposit is 0.02 to 0.1% by weight. 3. The method for producing an outer blade for an electric shaver according to claim 1 or 2, wherein the alloy electrodeposit is a nickel-manganese alloy electrodeposit and has a manganese atomic content of 0.2 to 0.75% by weight. 4. The method for manufacturing an outer blade for an electric shaver according to claim 1 or 2, wherein the alloy electrodeposit is a nickel-tungsten alloy electrodeposit and has a tungsten atom content of 10 to 40% by weight.