JPS5940236B2 - How to manufacture the inner blade of an electric razor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodeposition processing method for the inner cutter of an electric razor, and the structure of the inner cutter obtained by this processing method forms an acute cutting edge at the tip of the inner cutter. It is something.

Conventionally, the cutting edge angle of the inner blade of reciprocating electric razors is 90
Most of them are rated 0, and because they do not show sufficient sharpness in terms of shaving, they have drawbacks such as pulling the beard.

In order to eliminate this drawback, a processing method in which a cutting edge is created at the tip of the inner cutter by pressing the surface of the press is becoming popular, but the inner cutter itself is thin, approximately O. In, and is made of martensitic stainless steel. Because it is hard, the cutting edge angle cannot be obtained by pressing the surface sufficiently. The present invention eliminates these drawbacks, and the inner cutter obtained by the electrodeposition process of the present invention has a cutting edge with an acute angle of 900 or less at the tip of the inner cutter.

An embodiment of the manufacturing method according to the present invention will be described below with reference to the drawings.

1 and 2 show an insulating material 2 formed on a substrate 1, with FIG. 1 being a front view and FIG.
This is a cross-sectional view taken along line A'. An insulating substance 2 is formed on the surface of a conductive substrate except for the cutting edge of the inner cutter. As the material of the substrate 1, martensitic stainless steel, which is generally used for the inner cutter and the outer cutter, can be used. A photoresist or the like is effective as the insulating material 2, and is coated onto the surface of the substrate 1 to a uniform thickness using a machine such as a roll coater, screen printing, flow coater, or laminator. By baking and developing a desired pattern on the applied photoresist, the substrate 1
An image is formed on the surface of the substrate 1 in which only the tip of the inner cutter is exposed. Therefore, as shown in FIGS. 1 and 2, an insulating material is formed except for the tip of the inner cutter. Next, as shown in FIG. 3, the exposed portions of the substrate 1 are electrodeposited. This electrodeposited layer 3 will not have a sufficient effect unless it exceeds the thickness of the insulating material 2 and has a convex cross section as shown in the figure. Board 1
The electrodeposited layer 3 must have strong adhesion, and the electrodeposited metal must have the necessary strength, hardness, flexibility, etc. for the inner cutter, and hard nickel and nickel alloys are Optimal. The electrodeposition conditions for hard nickel are as follows:
NlSO4, 7H2O, 3009/l, NlCl2,
If electrodeposited at 50°C and cathode current density of 3A/d771'' with a composition of 6H2O, 509/l, H3BO3, 50y/l and some brighteners and stress reducers, a good electrodeposited material with Hv450 to 550 can be obtained. After the electrodeposition is completed, the insulating material 2 is removed using a stripping agent, as shown in Figure 4.
A semi-cylindrical electrodeposited layer 3 is obtained on the surface of the substrate 1. Next, the electrodeposited layer 3 in FIG. 4 is punched out along the line BB'. When press cutting along the line BB', it is desirable to cut along the top of the electrodeposited layer 3 as much as possible. If you cut above the center, the blade will have a rounded edge and you will not be able to obtain a sufficient sharpness; if you cut below the center, you will get a sharp edge, but the life will be shortened. Press punching does not require difficult technical skills and can be easily performed using conventional processing methods. FIG. 5 shows a cross section of the pressed inner cutter. 6th
The figure is a partial view in which a plurality of the individual inner cutters shown in FIG. 5 are connected by a connecting fitting. At this stage, the cutting edge of the inner cutter does not have sufficient contact with the outer cutter due to burrs during pressing or variations in attachment during connection, so the inner cutter is aligned by cylindrical grinding, etc., and has sufficient sharpness. It can be manufactured.

To restate the effects of the present invention, a sharp cutting edge of 90 mm or less can be freely obtained due to the position of repress punching, which is different from the conventional inner cutter.

Second, due to the self-sharpening action of the inner and outer cutters, as the number of inner cutters decreases, cutting edges become sharper and sharper, resulting in a more comfortable shaving experience. Thirdly, since a tough metal is electrodeposited on a hard thin plate, the strength of the inner blade is increased, which prevents breakage. Note that the manufacturing method of the present invention can also be easily used to manufacture the inner blade of a rotary electric razor.

[Brief explanation of drawings]

1 to 6 are process diagrams showing the present invention, and FIG. 1 is a diagram showing an insulating material formed on a substrate. FIG. 2 is a sectional view taken along line A-A' in FIG. FIG. 3 is a cross-sectional view of a substrate subjected to electrodeposition. Figure 4 is a front view with the insulating material removed.
FIG. 5 is a sectional view of the inner blade showing the present invention. FIG. 6 is a diagram showing the inner cutter of the present invention assembled. 1... Board, 2...
Insulating substance, 3...electrodeposition layer.

Claims (1)

[Claims] 1. An insulating material is formed on the surface of a conductive substrate so that the surface of the part corresponding to the tip of the inner blade is exposed, and after electrodeposition is applied to the exposed part of the substrate, the center part of the electrodeposited material and below is A method for producing an inner blade for an electric razor, characterized in that the inner blade has an acute cutting edge of 90° or less at its tip by cutting and removing.