JPS629677B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method of manufacturing an outer cutter for an electric razor. Generally, the outer blade for electric razors is a net blade with a number of holes for introducing hair, and a band-shaped protrusion is provided on the inner blade (opposing blade) side around the hole. Net blades are usually made using the electrodeposition method,
Conventionally, this electrodeposition molding has a two-layer structure consisting of a first electrodeposited layer and a second electrodeposited layer. For example, the first electrodeposited layer on the inner blade side is a nickel electrodeposited material formed by electrodeposition from an electrolytic solution containing nickel ions and to which an inorganic brightener such as nickel formate or magnesium sulfate is added. , a nickel electrodeposited material formed by electrodeposition from an electrolytic solution containing nickel ions as a second electrodeposited layer and adding thereto an organic brightener having a sulfur atom such as saccharin or sodium trisulfonate. There are some that have . In this outer cutter, both the above-mentioned inorganic brightener and organic brightener have the function of imparting surface gloss to the electrodeposited material and reducing internal stress, but in addition to this, the former brightener gives comparatively good toughness to the electrodeposited material, and the latter brightener has the function of making the electrodeposited material extremely hard, which can be used to improve the toughness of the first electrodeposited layer. The secondary electrodeposited layer is made to have excellent wear resistance, thereby preventing toughness damage such as cracks and fractures, as well as deformation and wear caused by strong external impacts and sliding with the inner cutter. Preventing. However, the first electrodeposition layer of this outer cutter has insufficient mechanical strength such as tensile strength and proof stress, and its hardness tends to be too low, and the second electrodeposition layer has poor thermal stability. When exposed to high temperatures due to sliding heat, a large change occurs in the metallographic structure, resulting in an extreme decrease in toughness. For this reason, when the first electrodeposited layer gradually deforms or wears out due to the above-mentioned reasons, toughness failure such as cracks and cracks will occur in the outer cutter due to the second electrodeposition layer. Another example of an outer cutter having a two-layer structure is, for example, a first electrodeposited layer made of nickel electrodeposited material and a material such as rhodium or ceramic that has excellent wear resistance and relatively good thermal stability. Some types include a second electrodeposited layer made of electrodeposited materials of different metals. However, the secondary electrodeposited layer of the outer blade generally tends to have a large internal stress, and since it is made of a different metal from the first electrodeposited layer (nickel), it is difficult to maintain adhesion between the two layers. Due to limitations on the layer thickness, it had to be made much thinner than the first electrodeposition layer, and as a result, as the first electrodeposition layer was worn away, the cutting edge on the inner blade side was damaged. There is a danger that it will come. In order to prevent this risk as much as possible, the hardness of the first electrodeposited layer made of nickel electrodeposit is increased by the use of an organic brightener containing sulfur atoms to improve its wear resistance. Due to poor thermal stability, which is a drawback of this electrodeposited material, the aforementioned toughness failure occurs during use. This invention was discovered as a result of intensive studies in light of the above circumstances, and consists of a first electrodeposited layer on the inner blade side and a second electrodeposited layer provided on this layer. In the method for manufacturing an outer blade for an electric razor having a two-layer structure, the first electrodeposited layer is made of nickel ions,
A nickel-cobalt alloy electrodeposited material is obtained by electrodeposition molding from an electrolytic solution containing cobalt ions and an inorganic brightener, and a second electrodeposited layer is made of nickel ions and a different material selected from cobalt ions, manganese ions, and tungsten ions. An alloy electrodeposit of nickel and the above-mentioned dissimilar metal is formed by electrodepositing from an electrolytic solution containing an organic brightener having metal ions and sulfur atoms, and the above-mentioned sulfur atoms are contained in the electrodeposit. It is characterized by The present invention will be explained below based on the drawings. FIG. 1 is an enlarged cross-sectional view of the main parts of the outer blade for an electric razor manufactured by the method of the present invention, in which 1 is the first electrodeposited layer on the inner blade side, and 2 is the top of the first electrodeposited layer 1. The second electrodeposited layer 3 is a band-shaped protrusion made up of both electrodeposited layers 1 and 2, and the hair is cut by sliding an inner blade (not shown) on this protrusion 3. do. The first electrodeposited layer 1 is formed by electrodeposition by impregnating cobalt ions in an electrolyte containing nickel ions and adding an inorganic brightener as a brightener (hereinafter simply referred to as existing electrolyte A). This resulted in a nickel-cobalt alloy electrodeposit, which was found in previous research by the inventors to show that its hardness and toughness depended on the cobalt atomic content, and that when this content was increased to 10% by weight or more, bitkers hardness
It has a much higher hardness than the nickel electrodeposited material obtained from the existing electrolyte A, which is over 450, and
An electrolytic solution that has an elongation of 2% or more according to the Erichsen test when the concentration is 50% by weight or less, contains nickel ions, and has an organic brightener containing sulfur atoms added thereto as a brightener (hereinafter simply referred to as existing electrolyte B). It has been found that when the concentration is 10 to 25% by weight, even more improved toughness can be obtained than the nickel electrodeposit obtained from the existing electrolyte A. It is something that Figure 2 shows an example of the mechanical strength, that is, the tensile strength and proof stress, of such a nickel-cobalt alloy electrodeposited material, as well as the aforementioned toughness, measured over a high temperature range from room temperature to 300°C or higher. In the figure, curves 1a, 1b and 1c represent the case of the nickel-cobalt alloy electrodeposited material according to the present invention with a cobalt atom content of 25% by weight, and curves 1a', 1b' and 1c' represent the case of the existing electrolyte A as a comparative example. The case of a conventional nickel electrodeposit obtained from As is clear from this figure, the nickel-cobalt alloy electrodeposited material according to the present invention has tensile strength and yield strength that are more than twice as high as those of the nickel electrodeposited material of the comparative example, and this improved strength is It can be seen that this is still maintained in this area.
Furthermore, as is clear from the fact that the elongation determined by the Erichsen test for toughness increases significantly in the high temperature range, it is clear that the toughness in the high temperature range is significantly improved compared to the nickel electrodeposited material of the comparative example. The first electrodeposited layer 1 has good mechanical strength and toughness as described above, and the above mechanical strength hardly decreases at high temperatures, and the toughness becomes even better as the temperature increases. This first electrodeposited layer 1 has extremely unique properties, which prevents toughness damage such as deformation, cracking, and cracking of the outer cutter during use.
can be greatly suppressed by On the other hand, since this electrodeposited layer 1 has high hardness as mentioned above, it can prevent wear due to sliding of the inner blade compared to the nickel electrodeposited material obtained from the existing electrolyte A, but this improvement has not been made. It was found that the initial hardness gradually decreased when exposed to high temperatures. In the present invention, this tendency is compensated for by the second electrodeposited layer 2. The second electrodeposited layer 2 is made of an existing electrolytic solution B, that is, an electrolytic solution containing nickel ions and to which an organic brightener containing sulfur atoms is added as a brightener, and further made of cobalt ions, manganese ions, and tungsten ions. An alloy electrodeposit of nickel and the above-mentioned different metal is formed by impregnating selected different metal ions and performing electrodeposition molding, and the above-mentioned sulfur atoms are contained in this electrodeposit. The inventors have already discovered that such an alloy electrodeposit has a hardness equal to or higher than that of the nickel electrodeposit obtained from the existing electrolyte B, and that it is often found in the above-mentioned nickel electrodeposit at high temperatures. No major changes in the metallographic structure were observed, and as shown in Figure 3, the hardness tends to gradually increase at high temperatures, and at this time, the initial toughness, which is almost the same as that of the nickel electrodeposited material described above, remains the same. It has been found that it has excellent thermal stability that is maintained constant. Figure 3 shows the case of a nickel-cobalt alloy electrodeposit with a cobalt atomic content of 20.9% by weight (curve 2a).
The graphs show the case of a nickel-manganese alloy electrodeposit with a manganese atom content of 0.52% by weight (curve 2b) and the case of a nickel-tungsten alloy electrodeposit with a tungsten atom content of 35% by weight (curve 2c), respectively. The content is 0.06-0.08% by weight. Results similar to those shown in Figure 3 are obtained in the case of nickel-cobalt alloy electrodeposit with a cobalt atomic content in the range of 5 to 50% by weight, and in the case of nickel-manganese alloy electrodeposited with a manganese atomic content in the range of 0.2 to 0.75% by weight. In addition, in the case of nickel-tungsten alloy electrodeposit, the tungsten atomic content is 10
Each is recognized in the range of ~40% by weight,
The sulfur atom content in the alloy electrodeposit at this time is 0.02 to 0.1% by weight. It should be noted that the nickel electrodeposit obtained from the existing electrolyte B has poor thermal stability, for example, the Vickers hardness is low.
When something around 550 is heat treated at 230°C for 30 minutes, the metallographic structure changes significantly and the toughness deteriorates, causing cracks when measuring hardness, making it impossible to obtain the characteristic curve shown in Figure 3. The second electrodeposited layer 2 has excellent thermal stability, so even if this layer 2 is provided, there is a risk that toughness failure such as cracks and cracks will occur during use as in the conventional case. It is the first to take advantage of its hardness properties, especially the property that the hardness increases under high temperatures.
The wear resistance of the outer cutter, which is insufficient with only the electrodeposited layer 1, is greatly improved. In addition, this electrodeposited layer 2, especially those in which the cobalt atom content, manganese atom content, or cobalt atom content in each alloy electrodeposit is within the above range, have lower internal stress than conventional materials such as rhodium and ceramic. Since each alloy electrodeposit is mainly made of nickel like the first electrodeposited layer 1, it has good adhesion to the electrodeposited layer 1, and even if the layer thickness is sufficiently thick, the electrodeposited There is no need to worry about peeling or deformation during molding. For this reason, even if the primary electrodeposited layer 1 wears out like in conventional outer cutters made of materials such as rhodium or ceramic, there is a risk that the cutting edge of the inner cutter protrusion becomes too thin and breaks. There is little sex. Next, a method for manufacturing the outer cutter for an electric razor of the present invention having the above characteristics will be described. First, an electrolytic solution for forming the first and second electrodeposited layers is prepared. As mentioned above, the electrolytic solution for forming the first electrodeposited layer is the existing electrolytic solution A containing cobalt ions, but there are various types of existing electrolytic solution A that are known in the past, and there are particularly representative ones. Examples include Watt's bath and sulfamic acid bath. Examples of inorganic brighteners to be included in this liquid include nickel formate, magnesium sulfate, nickel acetate, and magnesium sulfamate. Among these, nickel formate, magnesium sulfate, and magnesium sulfamate are most preferred. The amount of brightener used varies depending on the type, but for example, for nickel formate it is usually 10g/or more, preferably in the range of 10g/ to 40g/, and for magnesium sulfate it is usually 30g/or more, preferably in the range of 30g/ to 70g/. All you have to do is include it. The cobalt ions contained in this electrolytic solution are added and dissolved in the form of an appropriate cobalt salt depending on the type of electrolytic solution, and the amount of cobalt salt added is determined by the amount of cobalt atoms in the resulting alloy electrodeposit. The content should normally be 10 to 50% by weight; if this content is too low, sufficient hardness cannot be obtained, and if it is too large, toughness will be impaired and internal stress will increase, so this is not desirable. do not have. Within the above range, especially when the content is 10 to 25% by weight, better toughness can be obtained, and especially when it is 35 to 50% by weight, higher hardness can be obtained and the decrease in hardness at high temperatures can be suppressed. As mentioned above, the electrolytic solution for forming the second electrodeposited layer is the existing electrolytic solution B containing metal ions selected from cobalt ions, manganese ions, and tungsten ions. Various types similar to liquid A can be used. Examples of organic brighteners containing sulfur atoms to be included in this solution include saccharin, sodium naphthalene trisulfonate, and sodium naphthalene disulfonate, and the amount used depends on the content of sulfur atoms contained in the electrodeposited alloy. Usually, the content should be 0.02 to 0.1% by weight; too much content tends to make the outer cutter brittle, which is not preferable.
Incidentally, in some cases, the above-mentioned inorganic brightener may be used in combination with this organic brightener. The different metal ions to be included in this electrolyte can be arbitrarily selected from among cobalt ions, manganese ions, and tungsten ions, but those containing cobalt ions are particularly preferred.
The better the adhesion with the next electrodeposited layer, the greater the mechanical strength such as tensile strength for those containing manganese ions, and the better wear resistance for those containing tungsten ions. Therefore, it is desirable to take this tendency into account and select an appropriate outer cutter depending on the type of outer cutter, the manner of use, etc. Note that two or more of these ions may be included in the electrolytic solution to form a ternary alloy electrodeposit. In addition, each ion is added and dissolved into the electrolyte in the form of an appropriate salt depending on the type of electrolyte. Desirably the first degree
It is best to set the ratio so that the hardness is comparable to that of the next electrodeposited layer and the internal stress is sufficiently low.In general, dissimilar metals that have been recognized to have excellent thermal stability in each alloy electrodeposited material are used. The atomic weight should be within the above-mentioned range, that is, the cobalt atomic content should be generally 5 to 50% by weight, preferably 10 to 25% by weight, and the manganese atomic content should be 0.2 to 0.75% by weight, preferably 0.25 to 0.6%. Furthermore, the tungsten atom content is preferably 10 to 40% by weight, preferably 15 to 35% by weight. The electrolytic solutions for forming the first and second electrodeposited layers thus prepared are then subjected to any conventionally known electrodeposition molding. For example, when an insulating resin layer corresponding to the holes of a net blade is provided on a conductive metal substrate, and an arbitrary metal electrodeposited layer is formed on the exposed substrate between the resin layers, and this layer reaches the inner thickness of the resin layer or more. A peeling treatment is performed, and the above-mentioned first and second electrodeposited layer forming electrolytes are sequentially applied thereon to provide a two-layer electrodeposited layer for a net blade. Thereafter, this electrodeposited layer is peeled off from the surface of the metal electrodeposited layer which has been subjected to peeling treatment, to obtain an outer blade for an electric shaver whose principal part is shown in cross section in FIG. In such electrodeposition molding, the second electrodeposition layer 2
As mentioned above, the layer thickness is not particularly limited in terms of adhesion with the first electrodeposited layer 1 or internal stress, but if the total thickness is 50 to 130μ as the normal thickness, generally 5 ~40μ desirably 20~40μ
It is better to This is because by making the first electrodeposited layer 1 thicker, the mechanical strength and excellent toughness of the electrodeposited layer 1 can be utilized more, and this first electrodeposition layer 1 gradually wears out. This is because when the electrodeposited layer 2 is made thinner, good results can be obtained in cutting hair and reducing the sliding resistance with the inner blade. There is no risk of damage. Examples of this invention will be described below. Note that in the following, parts refer to parts by weight. Example 1 Electrolytic solutions having the following compositions were used as the electrolytic solutions for forming the first and second electrodeposited layers, and the electrodeposition conditions were as shown in Table 1 below. I made a net blade with a layered structure. <Electrolytic solution for forming the first electrodeposition layer> Nickel sulfamate 405g/Cobalt sulfamate 40g/Nickel formate 20g/Nickel bromide 5g/Formalin 2ml/Surfactant 3ml/PH 4 <Second electrodeposition layer Forming electrolyte > Nickel sulfamate 575g / Cobalt sulfamate 25g / Sodium naphthalene trisulfonate 12g / 2-butyne-1,4-diol 0.1g / Nickel formate 15g / Nickel bromide 5g / Boric acid 40g / Surfactant 2ml/PH 4

[Table] The first electrodeposited layer of the net blade thus obtained has a layer thickness of 85 μm and a cobalt atom content of 35% by weight, and the second electrodeposited layer has a layer thickness of 35 μm and a cobalt atom content of 35% by weight. The cobalt atom content was 19.8% by weight and the sulfur atom content was 0.01% by weight, and both layers had excellent adhesion and no peeling or deformation occurred during electrodeposition molding. Further, individual nickel alloy electrodeposit corresponding to each of these layers was prepared separately, and the hardness and elongation by Erichsen test after heating at room temperature and 300° C. were measured, and the results were as shown in Table 2 below.

[Table] Comparative Example A two-layer structure was prepared in the same manner as in Example 1 except that cobalt sulfamate contained in the electrolytes for forming the first and second electrodeposited layers described in Example 1 was not used at all. I made a net blade. The properties of the nickel electrodeposited material corresponding to each layer of this net blade, such as hardness and elongation by Erichsen test, were investigated and the results are shown in Table 3 below.

[Table] As is clear from the comparison between Table 2 and Table 3 above, the net blade of the comparative example suffers from toughness destruction during use mainly due to poor thermal stability of the secondary electrodeposited layer. On the other hand, the net blade of Example 1 has good thermal stability of the secondary electrodeposited layer, and the elongation of the primary electrodeposited layer increases significantly at high temperatures. As shown in Fig. 2, there is almost no risk of such toughness failure because the primary electrodeposited layer has large tensile strength and yield strength as well as high initial hardness, and the initial hardness remains at high temperatures. It can be seen that deformation and abrasion during use are suppressed compared to the comparative example because the second electrodeposited layer increases in temperature. Example 2 The following composition was used as the electrolytic solution for forming the second electrodeposited layer, and the solution temperature was 55°C and the current density was
The first electrodeposited layer consisted of a nickel-cobalt alloy electrodeposit, and the second electrodeposition layer consisted of a sulfur atom ^. A two-layered net blade was made of the electrodeposited nickel-manganese alloy. <Electrolytic solution for forming the second electrodeposited layer> Nickel sulfamate 450g / Manganese sulfamate 174g / Sodium naphthalene trisulfonate 15g / 2-butyl-1,4-diol 0.1g / Nickel bromide 5g / Boric acid 40g / Nickel formate 20g / PH 4 The second electrodeposited layer of this net blade has a layer thickness of 30μ, a manganese atomic content of 0.45% by weight, and a sulfur atomic content of 0.08.
% by weight, and had excellent adhesion to the first electrodeposited layer. Further, the hardness and elongation of this electrodeposited layer after heating at room temperature and 300° C. were measured by Erichsen test, and the results were as follows. Bitkers hardness Room temperature 573 300℃ 601 Elongation (%) Room temperature 2.1 300℃ 2.0 Example 3 An electrolytic solution with the following composition for forming the second electrodeposited layer was used, and the solution temperature was 55℃ and the current was density
The first electrodeposited layer consisted of a nickel-cobalt alloy electrodeposit, and the second electrodeposition layer consisted of a sulfur atom ^. A net blade with a two-layer structure consisting of electrodeposited nickel-tungsten alloy was made. <Electrolytic solution for forming the second electrodeposition layer> Nickel sulfamate 400g/ Sodium tungstate 90g/ Sodium citrate 50g/ Satucharin 0.5g/ Boric acid 40g/ Nickel bromide 5g/ Nickel formate 20g/ Surfactant 3ml/ PH 4.2 The second electrodeposited layer of this net blade has a layer thickness of 30μ, a tungsten atomic content of 19% by weight, and a sulfur atomic content.
The content was 0.05% by weight, and the adhesion to the first electrodeposition layer was excellent. Also, the temperature of this electrodeposited layer at room temperature and 300℃
The hardness after heating and the elongation by Erichsen test were measured and the results were as shown below. Bitkers hardness Room temperature 538 300℃ 552 Elongation (%) Room temperature 2.4 300℃ 2.3

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of the main parts of the outer cutter for an electric razor manufactured by the method of the present invention, and FIG. A characteristic diagram showing the tensile strength, yield strength, and elongation by Erichsen test of the electrodeposited layer. Figure 3 shows the thermal change in hardness of the secondary electrodeposition layer in the outer blade for an electric razor manufactured by the method of the present invention. FIG. DESCRIPTION OF SYMBOLS 1...First electrodeposition layer, 2...Second electrodeposition layer, 1a, 1b, 1c...First electrodeposition layer according to the present invention, 1a', 1b', 1c'... ...Conventional first electrodeposition layer, 2a...In the case of a nickel-cobalt alloy electrodeposit, 2b...In the case of a nickel-manganese alloy electrodeposit, 2c...In the case of a nickel-tungsten alloy electrodeposit.

Claims (1)

[Claims] 1. A method for manufacturing an outer blade for an electric razor having a two-layer structure having a first electrodeposited layer on the inner blade side and a second electrodeposited layer provided on this layer, The first electrodeposited layer is formed into a nickel-cobalt alloy electrodeposited material by electrodeposition molding from an electrolytic solution containing nickel ions, cobalt ions, and an inorganic brightener, and the second electrodeposited layer is made of nickel ions and cobalt ions. ,
Electrodeposition is performed from an electrolytic solution containing a different metal ion selected from manganese ions and tungsten ions and an organic brightener having a sulfur atom to form an alloy electrodeposit of nickel and the above-mentioned different metal. A method for producing an outer blade for an electric razor, characterized in that the outer blade contains sulfur atoms. 2. The outer blade for an electric razor according to claim 1, wherein the inorganic brightener contained in the electrolyte for the first electrodeposition layer is selected from nickel formate, magnesium sulfate, and magnesium sulfamate. manufacturing method. 3. Claim 1, wherein the organic brightener containing sulfur atoms contained in the electrolyte for the second electrodeposited layer is selected from saccharin, sodium naphthalene trisulfonate, and sodium naphthalene disulfonate. Or the method for manufacturing an outer blade for an electric razor according to item 2. 4 The cobalt atom content of the nickel-cobalt alloy electrodeposited material constituting the first electrodeposited layer is 15 to 50% by weight.
Claim 1, 2 or 3
Method for manufacturing outer blades for electric razors as described in . 5. Claims 1, 2, and 3, wherein the nickel alloy electrodeposit constituting the second electrodeposition layer is a nickel-cobalt alloy electrodeposit and has a cobalt atom content of 5 to 50% by weight. 4. A method for manufacturing an outer blade for an electric razor as described in item 1 or 4. 6 Claims 1, 2, and 3, wherein the nickel alloy electrodeposit constituting the second electrodeposition layer is a nickel-manganese alloy electrodeposit and has a manganese atomic content of 0.2 to 0.75% by weight. 4. A method for manufacturing an outer blade for an electric razor as described in item 1 or 4. 7. Claims 1, 2, and 3, wherein the nickel alloy electrodeposit constituting the second electrodeposition layer is a nickel-tungsten alloy electrodeposit and has a tungsten atomic content of 10 to 40% by weight. 4. A method for manufacturing an outer blade for an electric razor as described in item 1 or 4. 8 Claims 1, 2, 3, and 4, wherein the sulfur atom content in the nickel alloy electrodeposit constituting the second electrodeposition layer is 0.02 to 0.1% by weight,
The method for manufacturing an outer blade for an electric razor according to item 5, 6, or 7.