JPS596094A - Production of outer blade of electric shaver - 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 outer cutter used for a rotary electric shaver, etc., and in particular, a thin metal plate is pressure-welded to a mold having a large number of repeated convex portions and concave portions, and the shape of the concave portions is determined. A method for manufacturing an outer cutter, which involves forming a large number of rib-equivalent portions and hole-equivalent portions on a thin metal plate by changing the shape along the lines, and then polishing and removing the bottom portions of the hole-equivalent portions to form hair insertion holes having an annular peripheral wall. It is related to.

FIGS. 1 and 2 are diagrams for explaining this type of conventional manufacturing method.

As shown in FIG. 1, a large number of convex portions 2 forming portions corresponding to ribs and recesses 3 forming portions corresponding to holes are provided in a predetermined arrangement on the surface of a mold 1.

A thin metal plate 4 made of a stainless steel plate having a thickness of about 35 to 45 μm is placed on the mold 1, and the thin metal plate 4 is pressed into the mold 1 by a freely deformable pressing member 5 made of urethane rubber or the like. Pressed. With this pressure welding, each recess 3 of the mold 1
The part of the thin metal plate 4 facing the is pressed and deformed along the shape of the recess 3, and as shown in FIG.
A portion 6 corresponding to a hole and a portion corresponding to a hole 7 are formed repeatedly.

Then, by polishing and removing the bottom portion 8'f of each hexagonal molecule as shown by the dashed line A, a hair insertion hole 10 having an annular peripheral wall 9 is formed.

However, in this conventional method, when the thin metal plate 4 is partially deformed along the shape of the recess 3 by the pressing force of the suppressing member 5, the metal thin plate 4 is partially deformed along the shape of the recess 3. /! 4 The portion of the thin plate 4 facing the recess 3 is stretched and deformed, but since the facing portion is continuous, the thin plate 4 deforms while being subjected to mutual pulling forces inside. As a result, cracks occur during the formation process of the hexagonal molecules and remain on the peripheral wall 9, resulting in product defects.

The purpose of the present invention is to eliminate such drawbacks of the prior art,
K provides a manufacturing method for high quality outer cutters.

In order to achieve this object, the present invention provides a protrusion that pierces through the bottom of the hole-equivalent portion of the inner pressure metal thin plate in each of the four parts of the mold, and when the metal thin plate is pressed against the mold, the bottom of the hole-equivalent portion is pressed against the protrusion. It is characterized by breaking through at a certain point.

Next, one embodiment of the present invention will be described with reference to FIGS. 3 to 6.

As shown in FIGS. 3 and 4, on the surface of the mold 1, there are convex portions 2 for forming rib phases and corresponding portions 6, and four portions 3 for forming six-equivalent molecules. A large number of them are arranged in an array. A bottle-shaped protrusion 11 having approximately the same height as the protrusion 2 is formed in the center of each of the four parts 3.

As shown in FIG. 4, a deformable thin metal plate 4 made of stainless steel plate is placed on top of the mold 1, and a press member 5 made of urethane rubber or solder that can be freely deformed is used to press the metal plate 4. The thin plate 4 is pressed against the mold 1. Through this pressure welding, the parts of the thin metal plate 40 facing each of the recesses 3 of the mold 1 are pressed and deformed along the shape of the four parts 3, but at this time, the center of the bottom of the six-equivalent molecule is pierced by the protrusion 11. As a result, a through hole 12 is formed in the bottom portion 8' as shown in the sixth figure IK. In this way, forming the through hole 12E in the bottom part 8 of the hole-equivalent part 4 during molding, that is, breaking through a part of the bottom part 8, makes it easy to attach the thin gold plate 4 to the inner surface of the recess of the mold 1 by KvB. Also, since almost no unreasonable stress is applied, there is no racking like in the conventional method.

FIG. 5 shows a state in which the forming of the metal thin plate 4 has been completed.

After forming a large number of lip-equivalent portions 6 and hole-equivalent portions 1 on the thin metal plate 4, it is taken out from the mold 1, and as shown in FIG. After polishing and removing it, a hair insertion hole 10 having an annular peripheral wall 9 is formed. If the through holes 12 are formed in the bottom 8 during polishing, the flow of the polishing liquid will be better, and the polishing resistance will be reduced (this will improve the polishing ability and reduce the occurrence of pars).

The present invention has the above-mentioned structure, and cracks do not occur when the hole-equivalent portion is formed by press-forming the metal thin plate that will become the outer cutter. Therefore, it is possible to reduce the defective rate and improve the quality. It is possible to manufacture high-quality outer blades. Further, it has the advantage that the polishing ability is improved when polishing Wl is removed from the portion corresponding to the hole, and the occurrence of burrs is reduced.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views for explaining a conventional outer cutter manufacturing method, and FIGS. 3 to 6 are for explaining an outer cutter manufacturing method according to an embodiment of the present invention. FIG. 3 is a perspective view of the mold used in the example. FIG. 4 is a sectional view showing the state before press forming of the thin metal plate, FIG. 5 is a sectional view showing the state after forming the metal thin plate, and FIG. FIG. 6 is a sectional view showing the polishing process of the formed thin metal plate. 1...Mold, 2...Protrusion, 3...
...Recessed portion 14... Thin metal plate, 5... Pressing member, 6... Rib equivalent portion, 7...
Hole equivalent portion, 8...Bottom, 9...Peripheral wall, 10...Hair insertion hole, 11...Protrusion, 12... Toukou, A......Kenma position, 11 figures, 2 figures, 3 figures, <I'4, 5 figures, 60 497

Claims (1)

[Claims] A deformable thin metal plate is pressed against a mold in which a large number of convex portions forming portions corresponding to ribs and four portions forming portions corresponding to holes are repeatedly provided, and a hairstyle is formed along the shape of the four portions to form a lip equivalent to the thin metal plate. In a method for manufacturing an outer blade of an electric shaver, in which a number of holes and portions corresponding to the holes are formed, and then the bottom portions of the hole-corresponding portions are polished and removed to form hair insertion holes having an annular peripheral wall. A method for manufacturing an outer blade for an electric shaver, characterized in that a protrusion is provided to pierce the bottom of a hole-equivalent portion of a thin metal plate, and the protrusion pierces the bottom of the hole-equivalent portion when the thin metal plate is pressed against a mold.