JPH02299684A - Manufacture of outer cutting edge for electric shaver - Google Patents

Abstract

PURPOSE:To curtail the manufacturing process of the title edge and to obtain a smooth surface, by a method wherein, after a number of edge holes are formed on the basic member made of thin sheet-like metallic material by etching, a hard film is coated on its outer surface by plating or the like. CONSTITUTION:On the whole surface, except recess part 16, a basic member 1 made of sheet-like metallic material is shielded by masking 17, and then the recess part 16 is formed by etching. After that, the masking 17 is removed and, after the whole surface except the parts of cutting-edge hole 2 is shielded by the masking 17, the cutting-edge holes 2 are formed by the etching. After that, the masking 17 is removed, and electric discharge machining is applied between an electrode 20 and the obverse side of the basic member 1. At this time, the edges of the shoulder parts 21 on a cutting-edge rib 18 are removed, to expose round corners. After that, the basic material 1 is stuck on a substrate 22 and, after a first film 3a is coated on only the obverse side, a second film 3b having a high abrasion resistance is thinly formed on the whole surface.

Description

DETAILED DESCRIPTION OF THE INVENTION 1. Field of Industrial Application] The present invention relates to a method for manufacturing an outer cutter for use in manufacturing an outer cutter for an electric shaver.

[Prior Art] Conventionally, methods for manufacturing outer blades of electric razors include an electric creation method, an etching method, a pressing method, and the like.

[Problems to be Solved by the Invention] In the above-mentioned electrical creation method, an alloy mainly composed of Ni and Nickel is used as a material that has been put to practical use and is commonly used. However, products manufactured by electroforming using an alloy containing Ni as a main component have a problem of high wear and premature failure under repeated loads. In addition, when manufacturing using the etching method, after the blade hole is removed, edges remain on the front and back sides around the blade hole, and it is necessary to remove the edge on the side that contacts the skin in post-processing to add a corner radius. There is a problem in that it cannot be rounded, which increases irritation to the skin. In addition, although all kinds of metal materials can be used in the pressing method, as in the etching method,
There were problems such as a large amount of post-processing and distortion during pressing.

The present invention has been made in view of the above-mentioned points, and the objects of the present invention are to be able to be manufactured using fewer processes, to be obtained at low cost, to be manufactured using inexpensive materials, and to cause irritation to the skin. To provide a method for manufacturing an outer blade of an electric shaver, which provides smooth contact with the skin without any scratches, improves abrasion resistance and prevents breakage, allows easy attachment of the inner blade, and has good sharpness.

Means for Solving the Problems 1 In order to achieve the above object, the method for manufacturing the outer blade of the electric shaver of the present invention involves forming a large number of blade holes 2 in a thin metal plate material 1 by etching, and then It is characterized by coating the hard film 3 by plating or the like.

[Function] After the blade hole 2 is formed by etching, the blade hole 2 is formed and then the hard film 3 is coated, which makes it possible to manufacture the blade with a few processes, and to provide a smooth surface.

[Example 1] Although the method for manufacturing the outer cutter of an electric shaver of the present invention can be applied to the outer cutter of either a reciprocating electric shaver or a rotary electric shaver, an example of a reciprocating electric shaver will be described.

FIG. 1 shows the overall structure of an electric shaver. The outer cutter A is locked to the outer cutter frame 4, the inner cutter 5 is attached to the drive element 7 via the joint 6, and the outer cutter frame 4 is attached to the main body 8, and the inner cutter 5 and the outer cutter A are connected to each other. are brought into contact. here 9
10 is an inner cutter blade, 10 is an inner cutter stand, and 11 is a sinch. A large number of blade holes 2 are formed in the outer cutter A, and the beard introduced into the blade holes 2 is scissored with the inner blade 5. As shown in FIG. 2, the outer cutter A has a flat plate shape, and a number of cutter holes 2 are bored in the cutter hole opening area 12. The outer cutter A has a locking hole 1 for locking to the outer cutter frame 4.
It has 3. Fig. 3 is a cross-sectional view taken along the line X-X of Fig. 2, and Fig. 4 is a perspective view taken from the direction of the arrow Y in Fig. 3. Base material 1
The surface side of is coated with a first coating layer 3a,
A second coating layer 3b is coated on the front and back outer surfaces. In the case of coating both the first coating layer M/la and the second coating layer 3, at least the second coating layer; (1) is the hard coating layer 3, and in the case of only the first coating layer 3a. This layer is used as a hard coating 3. A sink portion 16 is formed on the back side of the outer cutter A to reduce the sliding area with the inner cutter 5 and reduce the load during driving.

Next, the process for manufacturing the outer cutter A will be explained with reference to FIG. First, as shown in Fig. 5(a), the base material 1 of the metal plate material is
Mask the entire surface except for the sink part 16] 7, and then
The sink part 16 is etched as shown in Figure (1)).
form. Next, as shown in FIG. 5(e), the above-mentioned masking 17 is removed, and as shown in FIG. 5(d), the masking 17 is applied to the part other than the 2 part of the blade hole, and as shown in FIG. 5(e), the masking 17 is removed. Etching is performed to open the blade hole 2. Since the etching for opening the blade holes 2 is performed from the surface, the side surfaces of the outer cutter ribs 18 between the blade holes 2 are inclined, and a blade edge angle can be obtained with one blade hole ession. Next, as shown in FIG. 5(f), the masking 17 is removed, and as shown in FIG. 5(g), the surface side of the base material 1 is subjected to electric discharge machining with the electrode 20 open.

At this time, the plate thickness of the first diversion material 1 also decreases, so the plate thickness is determined taking into account the decrease in plate thickness. In addition, the outer blade rib 18 is formed by electrical discharge machining.
The edge of the shoulder portion 21 is removed to form a corner radius. Electrolytic polishing or the like may be performed instead of electrical discharge machining. Next, as shown in FIG. 5 (11), the base material 1 is brought into close contact with the base material 22, and the first coating layer 3a is coated only on the surface side. In this case, since the first coating Ji13a is formed only on the surface of the outside world fi22, it can be formed so that the edge portion 19 of the blade hole is not rounded. Further, the radius of the shoulder portion 21 of the outer cutter rib 18 is formed to be larger than that shown in FIG. 5(A). When only the first coating layer 3u is coated, a hard metal is used to obtain the hard coating 3 in order to obtain wear resistance. After coating the f51 coating layer 3a, the J: sea urchin second coating layer 3b shown in FIG. 5(1) is coated on the entire front and back surfaces. The thickness of this coating is set within a range in which the radius of the cutting edge portion 19 does not affect the cutting quality.

For example, it is 0.1 μ[n to several μfO. If the second M layer 31 is plated, it should be hard, such as hard black 11 plating, and ion blating, CV l) (ct
+emical vapor deposition)
According to et al., there are TiN, TiC, ceramics, etc. In addition, when forming both the first coating M:3a and the second coating N31], the first coating N3a is made of a soft material with low bending rigidity (modulus of elasticity) such as copper, and is thickly formed by plating or the like. The radius of the shoulder portion 2 is increased, and the second coating layer 3 is coated with a highly abrasion-resistant coating material on the -H.
form a thin layer. This is because when forming a thick layer, if a hard and hard-to-bend material is used, the outer cutter A will be distorted due to internal stress, and the outer cutter A will not bend when bent, making it difficult for the outer cutter A to adhere to the inner cutter 5. This is to prevent

! @2 Covering layer 3b1. Since it is formed thinly, even if it is made of a hard and hard-to-bend material, the influence on the flexibility of the outer cutter A is small, and the friction caused by sliding with the inner cutter 5 and sliding with the skin can be reduced. Further, by increasing the radius of the shoulder portion 21, smooth contact without irritating the skin can be obtained, resulting in a more comfortable warping experience. The base material 1 may be hardened stainless steel or the like, but untreated low-grade steel can also be used because the coating layer has wear resistance, and the material cost can be reduced.

[Effects of the Invention] As described above, the present invention involves forming a large number of blade holes in the base material of a thin metal plate by etching, and then coating the outer surface with a hard film such as plating. It can be manufactured without any machining, requires fewer manufacturing processes than conventional methods, and can be manufactured at low cost.Also, since it is coated with a hard film, inexpensive materials can be used for the base material. It can be produced at low cost, has a smooth surface, does not irritate the skin, provides smooth contact with the skin, and is wear-resistant and difficult to break. It is something that can be achieved by obtaining .

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the entire electric shaver, Fig. 2 is a perspective view showing the outer cutter of the electric shaver, Fig. 3 is a sectional view taken along the line X-X of Fig. 2, and Fig. 4 is a 5th perspective view from the Y direction of
Figures (a) to (i) are cross-sectional views illustrating the second step of manufacturing the same outer cutter as above, in which 1 is a base material, 2 is a blade hole, and 3 is a hard coating.

Claims (1)

[Claims] [1] A method for manufacturing an outer blade for an electric shaver, which comprises forming a large number of blade holes in a base material of a thin metal plate by etching, and then coating the outer surface with a hard film by plating or the like.