JPS5975079A - Production of outer blade of electric razor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing an electric shaver outer blade using a combination of press working and electroforming.

Conventionally, the outer blades of electric razors have been manufactured by forming an uneven part on a hardened steel strip by press working, and then polishing the protruding part to form a blade hole, or by electroforming to form a blade hole. It is known that there is a method of manufacturing an outer cutter in the same shape at one time, but when using press processing, the transferability during pressing creates a rounded part of the cutter hole and the corner, which makes it easier for the hair to escape and efficiently removes the hair. There are problems in that the surface cannot be shaved, and the surface is rough due to scratches with the mold and needs to be finished by puffing. Outer blades are manufactured by making a mold, electrodepositing metal such as nickel onto it, and then separating the electrodeposited metal from the electroformed master mold, but electroformed blades have low strength against bending. The problem was that it had a short lifespan.

The present invention was provided in view of the above-mentioned problems, and includes forming the outer surface of the outer cutter with a single layer of electroforming, and forming the inner surface of the outer cutter with a hardened steel strip to prevent the introduced bristles from escaping. It is also an object of the present invention to provide a method for manufacturing an electric shaver outer blade that does not require surface finishing and has a long life.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below based on embodiment figures.

In Figures 1 and 2, the outer cutter 1 has a hardened steel strip 2 on its inner surface.
, the outer surface is formed of two layers of electroformed J-thread 8, and a plurality of blade holes 4 are formed via outer blade crosspieces 5. Such an outer cutter l can be manufactured by using a combination of press working and electroforming, and the press working process creates a tapered recess g156 and the recess at a position corresponding to the blade hole 4 of the outer cutter l. A hardened steel strip 2, which is the raw material for the outer cutter 1, is placed on a press lower die 8 with an open L-shaped portion 7 formed on the bottom of the outer cutter 6, and the cutter hole 4 of the outer cutter 1 is inserted from above the hardened steel strip 2. @ Ic 7--Press with a press upper mold 1 having a bar-shaped convex part 9 and a protrusion 10 formed at the tip of the convex part 9, and press the hardened steel strip 2 to form a concave ridge and a convex part [3]. of,
A pressed product 15 is produced by forming an opening 14 through which metal + ions electrodeposited on the hardened steel strip 2 in the electrolytic machining process pass. During the pressing process, the lower press mold 8 and the upper press mold 11 are fixed to a die set (not shown) so that the positions of the recesses 6 and the protrusions 9 and the positions of the openings 7 and the protrusions 10 are opposed to each other. . Furthermore, when the press lower die 8 and the press lower die 11 are fitted, the cross section of the concave portion 6 is similar to that of the convex portion 9 so that a clearance corresponding to the thickness of the hardened steel strip 2 is created between the concave portion 6 and the convex portion 9. It has a similar shape that is larger than the cross section, and the opening 7 and the protrusion 1
0 is such that the cross section of the opening 7 is larger than the cross section of the protrusion 10 and has a similar shape so as to create a clearance for cutting the hardened steel strip 2. Next, the electroforming process will be explained with reference to FIGS. 5 and 6. Convex portions 17 corresponding to the concave portions 12 of the pressed product 15 of 16 electrodeposited substrates are formed, and an electrically conductive paint is applied to the surface. After the pressed product 15 is hardened, the convex portions 17 of the electrodeposited substrate 16 are positioned corresponding to the recessed portions, and the pressed product 1 is
5 and an electrodeposited substrate 16 are arranged with a clearance corresponding to the thickness of the electroformed layer 8, and metal such as nickel is electrodeposited on the surface of the pressed product 16 by electroforming. Thereafter, the electroformed layer 8 is separated from the electrodeposited substrate 16. Next, the polishing process is shown in Figures 7 and 8.
This will be explained with reference to the figures. The inner surface of the pressed product 15 (ends from the two-dot chain line) is polished smoothly to form a blade hole 4 and a convex inner blade sliding surface I8 around the blade hole 4. This embodiment has the advantage that the outer cutter can be manufactured efficiently with only one polishing process.

FIGS. 9 to 16 show other embodiments of the electric razor outer blade manufacturing method, and the press working process corresponds to the blade hole 4 of the outer blade 1 as shown in FIGS. 9 and io. The hardened steel strip 2, which is the raw material for the outer cutter 1, is placed on the lower part of the press where the deburr-like recesses 19 are formed, and the dever-like protrusions are formed on top of it at the positions corresponding to the blade holes 4 of the outer cutter 1. Pressing is performed with the press lower die η in which the portion 21 has been formed to form concave portions n and convex portions in the hardened steel strip 2, thereby producing the tapeless processed product 5. Next, after hardening this pressed part, the end of the hardened steel strip 2 (the end from the two-dot chain line) is polished for the first time to make it open, as shown in Fig. 11 and Minor diagram. A band-shaped convex portion η is formed around the part I and the opening part, and then an electroformed layer 8 is formed on the outer surface of the press-formed part by an electroforming process as shown in the imperial edict and FIG. 14. , Then, as shown in FIGS. 15 and 16, the edges of the hardened steel strip 2 and the electroformed layer 8 (the edges from the two-dot chain line) are smoothed and subjected to a second θf polishing to form the blade hole. 4 and a convex inner blade sliding surface is formed around the blade hole 4. 4 is an electrodeposited base.

As described above, the method for manufacturing an electric shaver outer blade according to the present invention includes a press working step of press-working a hardened steel strip to form an uneven portion on the hardened steel strip, and a pressed product made by the press working. It is characterized by comprising an electroforming process of forming an electroformed layer on the outer surface of the pressed product, and a polishing process of I-polishing the inner surface of the pressed product to form a blade hole and an inner blade sliding surface. Because the corners of the blade hole are sharp, the introduced hair does not escape and allows for efficient shaving, and the smooth surface of the outer blade allows for a puff finish. This has the effect of making it possible to manufacture the outer cutter efficiently.Furthermore, the strength against bending of the outer cutter is increased by the hardened steel strip, resulting in a longer service life. Scratches from the trapezoid on the surface of the electrodeposition layer increase the electrodeposited strength of the electroformed layer, which has the effect of preventing the electrodeposition layer from peeling off.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of the outer cutter produced by the method of manufacturing the outer cutter of an electric shaver of the present invention, Fig. 2 is a plan view of the same, and Fig. 8 and Fig. 4 show the press working process. 6 and 6 are sectional views showing the electroforming process, FIGS. 7 and 8 are sectional views showing the polishing process, and FIGS. 9 and 10 are sectional views showing other embodiments of the present invention. FIGS. 11 and 11 are cross-sectional views showing the polishing process in the example, FIGS. 13 and 14 are cross-sectional views showing the electroforming process in the above, and FIG. and FIG. 16 is a sectional view showing the same polishing process. l... Outer blade, 2... Hardened steel strip, 8... Electroformed layer, 4
...Blade hole, 15.25...Pressed product, 18.
28... Inner blade sliding surface. Patent Applicant Matsushita Electric Works Co., Ltd. Representative Patent Attorney Toshimaru Takemoto (and 2 others) Fig. 3 Fig. 4 Fig. 5 Fig. 6 Cedar r Fig. 7 Fig. 3 Fig. 11 Fig. 131 q 5 Figure 15 Figure 12 Cup 4 Figure 14 5 Figure 16

Claims (1)

[Scope of Claims] 1. A press working step in which a hardened steel strip is pressed to form uneven portions on the hardened steel strip, and an electroformed layer is formed on the outer surface of the pressed product produced by the press working. The electroformed culm to be formed,
A method for producing an outer blade for an electric shaver, comprising a polishing step of polishing the inner surface of the pressed product to form a blade hole and an inner blade coupling surface. 2. The method for manufacturing an outer blade for an electric shaver according to claim 1, wherein an uneven portion is formed in the hardened steel strip in a press working process, and an opening is bored at the bottom of the recessed portion.