JPS5913225B2 - How to remove grinding burrs from the beard introduction hole of the outer blade of an electric razor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to drilling of hair introduction holes in an electric razor outer blade.

For drilling the hair introduction hole of the conventional electric razor outer blade,
The outer blade material is not punched out, but the coined sink material is heat treated, and the whisker introduction hole is removed by mechanical grinding with a grindstone, electrochemical electrolytic grinding, or chemical etching process to form the whisker introduction hole. However, in mechanical grinding, grinding burrs remain in the whisker introduction holes, while in the case of electrolytic grinding or etching, an electrolytic solution or etching solution is used to drill holes by dissolving or corroding, resulting in variations in processing accuracy and Machining other than the introduction hole or surface treatment such as film coating to prevent corrosion is required, and pollution countermeasures for waste liquid treatment must be taken into consideration, and shear punching is also possible by cutting the inner blade of the outer blade material with the whisker introduction hole punched out. When mechanically grinding the sliding surface, grinding burrs occur in the whisker introduction hole.

In view of the above, this invention uses a rigid die and a soft ram to reliably punch out and remove the grinding burrs that remain in the whisker introduction hole during mechanical grinding during coining sink processing or shear punching processing. It is.

The present invention will be explained below based on an embodiment using a coining sink process shown in the drawings.

A is an outer blade material that has been coined and heat treated, the whisker introduction hole 1 is mechanically ground with a grindstone B to a predetermined blade thickness T (see Fig. 115), and then the metal with the protrusion 3 is Dai D
Place the mechanically ground outer blade material A on top with the whisker introduction hole 2 aligned with the convex portion 3 so that the unground surface side, that is, the surface side of the product that comes into contact with the skin, is installed (see Figure 2), and then the outer blade material Material A
From the grinding surface side (the surface side on which the inner cutter slides) 20 to the soft ram P
(see Figure 2). Due to this pressure, the outer cutter material A sinks together with the knockout plate 4, and the rigid die D
The convex portion 3 protrudes relatively, and the grinding burr 5 on the circumferential side of the hair introduction hole 2 is sheared 25 by the cutting edge portion 6 toward the soft ram P (Figs. 3 and 5). ), then when the load on the soft ram P is removed, the side wall of the convex part 3 of the rigid die D and the soft ram P are not sheared and punched out.
The grinding burr 5, which is sandwiched between and bent, is
As the soft ram P recovers from its elastic deformation, it is folded back 30 times, and the grinding burr 5' is bent twice by the rigid die convex portion 3 and the soft ram P, resulting in a cutting edge portion 6 as shown in FIGS. 4 and 6. A crack T occurs in the vicinity and is completely separated and removed from the cutting edge portion 6. 35. As explained above, the grinding burrs remaining in the whisker introducing hole of the outer blade material which has been mechanically ground are removed by applying pressure with the soft ram from the grinding surface side using a rigid die and a soft ram and shear punching. Therefore, grinding burrs can be easily and reliably removed.According to the present invention, the variation in the blade thickness is negligible and the machining accuracy is high, and it is possible to perform drilling on the outer blade without grinding burrs on the cutting edge. Additionally, compared to conventional electrolytic grinding and etching processes, the number of man-hours required for drilling can be reduced to about 1/3, and the processing cost can be reduced to about 1/5.Moreover, it does not require processing solutions and does not require consideration of pollution countermeasures. .

[Brief explanation of the drawing]

The drawings show the process of an embodiment of the present invention, in which Fig. 1 shows the mechanical grinding state of the hair introduction hole, Fig. 2 shows the set state, and Fig. 3 shows the pressurization of the grinding burr. A diagram showing a state of shear punching, FIG. 4 is a diagram showing a state in which pressure is released,
5 is an enlarged view of the main part of FIG. 3, and FIG. 6 is an enlarged view of the main part of FIG. 4.

Claims (1)

[Claims] 1. The outer blade material, which has been mechanically ground and heat-treated with the whisker introduction hole formed by coining sink processing or shear punching, is placed on a rigid die having a convex portion, with the unground surface side aligned with the convex portion. Then, the grinding burrs remaining in the whisker introduction hole during mechanical grinding were hammered out by applying pressure with a soft ram from the ground sink surface side of the outer blade material, thereby obtaining an outer blade without grinding burrs in the whisker introduction hole. A method for removing grinding burrs from a beard introduction hole of an electric razor outer blade, characterized by: