JPH08141228A - Production of outer edge for electrical razor - Google Patents

Abstract

PURPOSE: To produce an outer edge for an electrical razor by an integrated press working line, without using lacing or milling, by shear-pressing a thin sheet to provide slots and by drawing-pressing to form three-dimensional outer edges. CONSTITUTION: A hollow disc of an adequate material, such as stainless steel, is drawing-pressed to produce a ring-shape convex part 1 for a rotary electrical razor. The convex part 1 is provided with slots 2 crossing the total ring thickness, through which hairs are introduced into the razor, on the top at the same pitch, to provide bridge-like edges 3. The groove section at the back side of the convex part 1 accommodates a rotary inner edge in such a way that the inner edge can rotate along the groove. A thin sheet is shear-pressed to provide the slots, and then drawing-pressed to form three-dimensional outer edges. Thus, the outer edge is produced by an integrated press working line consisting of two or more steps.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an outer blade of an electric razor, and more particularly, to a method for manufacturing an outer blade for forming a cutting edge portion by consistent press working.

[0002]

2. Description of the Related Art Conventionally, an example of an outer blade (outer blade head) of a rotary electric razor (so-called third type) is shown in FIG.
As shown in Fig. 4, a circular plate material with hollow holes such as stainless steel is drawn to form an annular convex surface portion (annular bulging table) 1, and a large number of slit holes (beard introduction holes) are provided at the top of the convex surface portion. It is known that 2 are grooved at the same pitch and a large number of bridging cutting blade portions 3 are formed at the top portion of the convex surface portion 1.
A rotary inner blade (not shown) is provided in the concave groove 4 on the back side of the convex surface portion 1.
Is rotatably housed in sliding contact, and when shaving the beard, the beard that enters the slit hole 2 and protrudes to the back side is sheared by its inner blade (movable blade) and cutting blade portion 3 (fixed blade). It is supposed to be removed.

An outer blade having a large number of slit holes 2 oriented in the transverse direction (oblique radial direction) in the annular convex surface portion 1 as described above is conventionally manufactured as follows in a single mold process, for example. . That is, as shown in FIG.
After punching a plate material having a thickness of about 0.7 mm to form a disk having a hollow hole (discard hole) 5, the disk is subjected to a drawing press process to form an outer surface having an annular convex surface portion 1. Adds a three-dimensional shape to the blade. Next, as shown in FIG. 11B, the back surface side of the convex surface portion 1 (bottom surface of the concave groove 4) is thinned by lacing to form a thin portion 1a of, for example, about 0.2 mm.
Next, as shown in FIGS. 11 (c) and 12 (a), a transverse direction (oblique radial direction) with respect to the thin portion 1a of the convex surface portion 1
Milling is applied to each of the slit holes 2 to form one by one.

By this milling process (for example, when the outer blade has a diameter of about 2 cm, the number of slit holes is 90), a large number of cutting blade portions 3 sandwiched between the slit holes 2 and 2 are formed.

After that, a quenching process, a lapping process for the back side, and a buffing process for the front side are performed.

On the other hand, as an outer blade of an electric razor, a mesh-shaped outer blade manufactured by an electroforming method is also known. The mesh-shaped outer blade is used for both the rotary electric razor and the vibrating electric razor, but it has a drawback that the manufacturing cost is high.

[0007]

By the way, the following problems are encountered in the method of manufacturing the outer blade of the electric razor using the above-described lace processing (thinning) and milling (grooving) steps. was there.

Conventionally, it is necessary to use a relatively thick plate material (about 0.7 mm) in order to maintain the rigidity of the material at the time of milling, but in order to shorten the unshaved length of the beard as much as possible, drawing processing is performed. Before the post-milling process, the thin portion 1a is locally formed by lace processing. For this reason, high precision is required for the lace processing for forming the thin portion 1a, which has been an obstacle to improving the yield.

In addition, since a large number of slit holes 2 are sequentially formed by milling one by one after the race processing, it takes a long time until the last slit hole is cut. , Mass productivity is extremely low. Therefore, it is difficult to reduce the manufacturing cost of the outer blade.

Since the cutting edge portion 3 is left after cutting the slit hole 2 by milling, as shown in FIG. 12, the cutting edge angle α of the cutting edge portion 3 is substantially a right angle. For this reason,
The shear resistance (shear stress) at the time of beard cutting is large, and the problem that the beard shaving is not sharp occurs. In order to remove burrs and the like generated by milling, it is necessary to buff the front surface side after the back surface lapping step. However, as shown in FIG. 12B, the front surface side of the cutting edge portion 3 is formed by this buffing step. Although the corners are rounded off in a round shape, they do not reach the blade end located in the deep part and cannot be removed to such an extent that the cutting edge angle α becomes an acute angle. Also, because of the milling process, it was originally impossible to reduce the thickness in order to maintain the overall strength.

In view of the above problems, the first object of the present invention is to reduce the number of man-hours by eliminating the race and milling and forming the cutting edge portion by pressing at once. An object of the present invention is to provide a method for manufacturing an outer blade of an electric razor capable of realizing a lower cost of manufacturing the outer blade. A second object of the present invention is to further reduce the cost of the outer blade by simplifying the buffing process. A third object of the present invention is to form a sharp cutting edge of the outer blade so that the cutting edge has a sharp cutting edge angle, so that the whisker can be sharply cut and the unshaved length of the mustache is made small. It is in.

[0012]

In order to solve the above problems, the method for manufacturing an outer blade of an electric razor according to the present invention is characterized by comprising a plurality of steps of consistent press working. That is, the present invention provides a thin plate material in a method for manufacturing an outer blade of an electric razor having a large number of beard introducing holes,
On the other hand, a beard introduction hole forming step of forming a beard introduction hole by punching by shear press processing, and an outer blade forming step of giving a three-dimensional outer blade shape by drawing press forming the formed material with a beard introduction hole. It is characterized by having.

Further, for example, between the above-mentioned beard-introducing hole forming step and the above-mentioned outer blade forming step, the plate surface with a beard-introducing hole formed is compression-pressed to imprint the cut surface of the above-mentioned beard-introducing hole and the cutting edge It is desirable to provide a cutting edge shaping process that imparts an inclined surface. In this cutting edge part shaping step, a beard guiding surface may be provided at the same time.

It is preferable that the step of forming the beard introducing holes is to repeat the step of dispersive drilling, instead of drilling all the many introducing holes at once. The manufacturing method described above is also applicable to a mesh-shaped outer blade, but when the outer blade is an outer blade of a rotary electric razor having a large number of mustache introducing holes arranged rotationally symmetrically, the whisker introducing hole forming step is performed. It is preferable that the method comprises repeated operations of a circumferential implanting type drilling step for forming a plurality of the above-mentioned beard introducing holes arranged at equal intervals along the circumference. In such cases,
It is better to equalize the number of beard introducing holes to be drilled in each circumferential implanting type drilling step.

Each of the above-mentioned press working may be performed by a single die press or a progressive feed step. However, in the case of a single die press, a waste hole for punching a hollow hole is formed before the beard introduction hole forming step. It is desirable to provide a forming process. Further, in the case of the progressive feeding step, it is desirable to provide a waste hole forming step for making a hollow hole between the beard introducing hole forming step and the outer blade forming step.

Further, it is desirable to provide a quenching step between the outer blade forming step and the polishing or lapping step.

The flat plate material is preferably a stainless steel material having a plate thickness of 0.1 mm to 0.3 mm.

[0018]

According to the manufacturing method of the present invention, a large number of beard introducing holes are formed all at once in the thin plate material by punching by shear press working. Contrary to the conventional manufacturing method by milling, the thin plate material provided with the beard introducing hole is formed into a predetermined outer cutter three-dimensional shape by performing drawing press processing after forming the beard introducing hole. Here, the beard introduction holes are not formed by milling one by one, but a large number of beard introduction holes can be formed by punches and dies, so that the process time can be shortened and the outer blade is manufactured. The cost can be reduced.

Since the thin plate material can be used from the beginning, the thickness of the cutting edge portion can be made extremely thin and the unshaving length can be made extremely short. Therefore, unlike the conventional method, it is not necessary to add lace processing for thinning the cutting edge portion, and also from this point, the cost of the outer blade can be reduced.

As described above, between the beard introduction hole forming step formed by punching with the press and the outer blade forming step, the cut surface of the beard introduction hole is imprinted by the compression press work to give the blade tip inclined surface. It is desirable to provide a cutting edge shaping process. When the cutting edge surface is shaped by such coining, a cutting edge having an acute cutting edge angle can be sharply formed. Therefore, the resistance at the time of cutting the beard can be made small, and the beard shaving feeling can be improved. Further, on the contrary, since the shearing stress of the cutting edge portion can be reduced, it is possible to further reduce the thickness of the cutting edge portion in terms of strength, which contributes to the reduction of the unshaved length. The hardness of the surface of the inclined surface of the cutting edge is increased by the work hardening of the coining, so that the life of sharp beard shaving can be extended. Further, such a cutting edge shaping step also has the effect of correcting the shape of the entire cutting edge that has been deformed in the previous step of drilling, and the orientation, arrangement, etc. of a large number of cutting edges can be adjusted.

In the above-mentioned step of shaping the cutting edge portion, only the inclined surface of the cutting edge is provided, but at the same time, a beard guiding surface may be provided. It is possible to widen the surface opening side of the beard introducing hole, or to provide a tapered surface or a sloped surface. As a result, the hair collection effect is enhanced, so that the beard shaving ability can be improved.

Here, as the above-mentioned beard introduction hole forming step, not all the beard introduction holes are drilled by one shear press work, but they are formed stepwise by repeating the dispersive drilling step. There is. Since it is possible to clamp the peripheral part of a hole at a certain position, it is possible to make holes between the adjacent beard introduction holes, and even with a thin plate material, without breaking the cutting edge part between adjacent beard introduction holes, Although the deformation occurs, a sufficiently good hole can be drilled by shear press working. When the outer blade is an outer blade of a rotary electric razor having a large number of beard introducing holes arranged in a rotationally symmetric arrangement, the beard introducing hole forming step includes a plurality of the beard introducing portions arranged at equal intervals along the circumference. Desirably, it comprises a repetitive operation of the circumferentially implantable drilling process to form the holes. Rather than intensively or densely making a large number of holes at once, the holes are dispersed throughout and made in multiple times. In particular, when the number of beard introducing holes to be drilled in each circumferential implanting type drilling step is made equal, the force applied to the thin plate material does not become large, so it is possible to effectively prevent breakage of the cutting edge part etc. .

[0023]

1 to 5 are plan views showing thin plate materials (blanks, works) for sequentially explaining processes up to a beard introducing hole forming step in an embodiment of a method for manufacturing an outer blade of an electric razor according to the present invention. is there.

The manufacturing method of this example consists of a single die pressing process. First, a stainless steel flat plate material (thickness 0.1 mm to 0.3 m
m) is prepared, and as shown in FIG. 1, a punch is applied to the surface side by shearing press to punch an outer diameter (diameter of about 2 cm), and at the same time, a middle punched hole (discarded hole) 10 and its surrounding 90
° Pilot holes 11 are made at intervals. Hollow hole 1
0 is necessary to give a drawing deformation during the drawing press working in the subsequent process, and the pilot hole 11 is necessary to guide and support the work W after this.

In the next step, as shown in FIGS. 2 to 5, the work is cut from the front surface side to the back surface side (the back surface side is supported by a die and a punch is applied to the front surface) by shearing press to make a circle. This is a process for forming a mustache introducing hole for forming a large number of mustache introducing holes (slit holes: slit length about 3 mm, slit length about 0.3 mm) 12 lined up around the circumference. In the present example, this beard introducing hole forming step is performed by performing a circumferential implanting type drilling process in four steps.

That is, in the first beard introducing hole forming step shown in FIG. 2, equiangular intervals (18 °) are formed around the hollow hole 10.
In each case, 20 beard introducing holes 12 are formed at once in the oblique (radius crossing about 10 °) radial direction. Here, since the 20 beard introducing holes 12 are circumferentially implantable and are formed at equal angular intervals (18 °), shearing stress is generated in the work W in a dispersive manner at the time of punching. In spite of the thin plate material, there is no risk of inadvertent breakage between the beard introducing holes 12, 12 in the portion that should be the cutting edge portion.

Also in the second beard introduction hole forming step shown in FIG. 3 below, 20 beards are introduced at once in the oblique radial direction at equal angular intervals (18 °) around the hollow hole 10 with respect to the work W. The hole 12 is newly punched out, whereby the beard introducing hole 1
The number of 2 is 40 in total. Here, the second beard introducing hole 12-2 is formed in the middle portion of the first beard introducing holes 12-1 and 12-1. This is because, for example, when a plurality of beard introducing holes 1 are locally formed at once in a concentrated manner, breakage occurs in a portion that should remain as a cutting edge portion. During the second punching, shear stress is generated in the work W as a whole and in a dispersed manner, so that in spite of the thin plate material, involuntary breakage occurs between the beard introduction holes 12 having a narrow pitch. There is no.

However, even if the portion to be remained is deformed to some extent, it can be repaired in the cutting edge portion shaping step which is a post-step although the fracture is not reached. By the second beard introduction hole forming step, the beard introduction holes 1 are provided at intervals of 9 ° around the hollow hole 10.
2 is formed.

Also in the third beard introducing hole forming step shown in FIG. 4 below, 20 beards are introduced at a uniform angular interval (18 °) around the hollow hole 10 in the oblique radial direction with respect to the work W. The hole 12 is newly punched out, whereby the beard introducing hole 1
The number of 2 is 60 in total. By the way, the number of holes between the first beard introducing hole 12-1 and the second beard introducing hole 12-2 is 40 by the second punching process, but the third punching process is performed. 40 teeth (9
Instead of using punches having punched teeth of (° intervals), punches having punched teeth of 20 teeth (18 ° intervals) similar to those in the first and second times are used in this example. If the number of teeth is increased, the shearing force is also increased, and there is a possibility that the whisker introduction holes 12, 12 may be inadvertently broken between the holes. To avoid this, a punch with 20 teeth is used. Therefore, in the third punching, the whisker introduction holes 12-3 are formed every other one of the 40 between the beard introduction holes 12-1 and 12-2.
The result is that the beard introduction holes 12-3 are left without being formed every other number of holes every other hole, but the remaining beard introduction holes 12-1 and 12-2 are formed by the fourth punching step shown in FIG. A beard introducing hole 12-4 is formed therebetween. As a result, a total of 80 beard introducing holes 12 are formed around the hollowed hole 10 at intervals of 4.5 °.

When a large number of beard introducing holes 12 are formed in the thin plate work W by such shear pressing, as shown in FIG. 6B, due to the nature of the shear pressing, the cutouts of the beard introducing holes 12 are formed. As for the surface, the front surface side W ₁ (punch side) is a sheared surface or sag surface S ₁ , and the back surface side W ₂ (die side) is a fracture surface S ₂
And the middle portion is burnt to form a smooth shear plane S ₀ .

Therefore, when the fracture surface S ₂ is used as it is as the cutting edge surface, the cutting edge angle α becomes an obtuse angle, and the sharpness of the beard is not good.

After the above-mentioned beard introducing hole forming step, in this example, a cutting edge shaping step is particularly added. In the cutting blade shaping step, as shown in FIG. 7, the work W with a beard introduction hole is compressed and press-cut to the cut surface (S ₁ or S ₂ ) of the beard introduction hole 12 to form the beveled edge surface 13a and the beard. Guide surface 1
3b is given. In this example, the punch used for coining is abutted from the front surface side W ₁ , the sheared surface or the sagging surface S ₁ is expanded and expanded, and the blade tip inclined surface 13a is formed in the longitudinal direction of the slit hole. A beard guiding surface 13b, which is a sloped surface, is formed at the inner diameter side end of the slit hole. Since the cut surface is shaped by coining, the blade tip inclined surface 13a and the beard guiding surface 13b are cold forged surfaces,
The work hardening increases the hardness of the surface layer. In this way, when the cutting edge shaping step by coining is added, a predetermined acute cutting edge angle α can be reliably obtained instead of the cutting edge surface of the cutting blade portion 13 as a fracture surface, and variations in the cutting edge angle α are also possible. Can be corrected. Further, the surface hardness of the cutting edge surface can be increased. Therefore, sharp beard shaving and longer life can be realized. Although many cutting edge portions 13 are deformed (twisted or warped) by the beard introduction hole forming step, the deformation is also corrected by this cutting edge portion shaping step, and the many cutting edge portions 13 are regularly arranged. You can In addition, since the beard guiding surface 13b can be formed at the same time in the cutting edge part shaping step, a new step can be eliminated, and the hair collecting effect is enhanced by the beard guiding surface 13b, and the beard shaving performance is improved.

In the next step, as shown in FIG. 8, the disk-shaped work W is cut off (punched) by shearing to eliminate the pilot hole 11. After that, as shown in FIG. 9, drawing press working is performed to extrude the region of the cutting edge portions 13 arranged in an annular shape to form an annular convex surface portion (annular bulging table) 1
4 is formed into a three-dimensional shape. The outer blade manufacturing process is completed for the time being by the outer blade forming process by the drawing press work, but the present embodiment has the following process as a post process. After the squeeze press working, a notch for rotation prevention is formed on the outer peripheral edge of the work W by punching. This notch for rotation prevention is for fixing the outer cutter to the razor body in a rotation prevention manner. This completes a series of pressing steps, after which the work W is subjected to quenching treatment.

Although the present invention has been described in the case of the single mold process in the above embodiment, it is needless to say that the present invention can be applied to the progressive process if a band-shaped blank is used. The press working in the progressive process is, for example, the formation of piercing holes → the formation of the first beard introduction holes (10 holes) → the second formation of the beard introduction holes → the third formation of the beard introduction holes → the third 4th beard introduction hole formation → 5th beard introduction hole formation → 6th beard introduction hole formation → 7th beard introduction hole formation → 8th beard introduction hole formation → imprint The process of shaping the cutting edge portion by → is performed in the order of punching formation of a hollow hole → trimming process → drawing process → cutting process. It is desirable to form the hollow hole for the drawing process after the beard introduction hole forming step (cutting edge shaping step).

[0035]

As described above, in the method for manufacturing the outer blade of the electric razor according to the present invention, a large number of whisker introduction holes are formed in the thin plate material from the front surface side to the back surface side by shear press working. After that, it is characterized in that the outer blade has a three-dimensional shape by drawing press working from the back surface side to the front surface side. Therefore, the following effects are obtained.

According to the beard introduction hole forming step by press working, a large number of beard introduction holes can be formed by punches and dies, so that the process time can be shortened.
It is possible to reduce the manufacturing cost of the outer blade. Also,
Since a thin plate material can be used from the beginning, the thickness of the cutting edge portion can be made extremely thin, and the unshaving length can be made extremely short.

Therefore, unlike the conventional method, it is not necessary to add lace processing for reducing the thickness of the cutting edge portion, and the cost of the outer blade can be reduced.

When a step of polishing or lapping the back surface side is added after the outer blade forming step, the surface layer of the thin plate material is removed by such a polishing or lapping step. Also, the fractured surface or the burr surface of the beard introduction hole for punching by the press can be removed at the same time, the beard is not caught in the gap of the fractured surface, and the beard shaving length can be minimized by thinning the plate.

Further, in the case where a cutting edge portion shaping step of imprinting the cut surface of the beard introducing hole by compression pressing to give a beveled edge surface, regardless of the drilling direction of the shear pressing performed before that. Become. That is, the cut surface of the beard introducing hole punched by the shear press process may be coined to make the blade tip inclined surface, or the fracture surface may be coined to make the blade tip inclined surface. When the cutting edge surface is shaped by such coining, a cutting edge having an acute cutting edge angle can be sharply formed. Therefore, the resistance at the time of cutting the beard can be made small, and the beard shaving feeling can be improved. On the contrary, since the shearing stress of the cutting edge portion can be reduced, it is possible to further reduce the thickness of the cutting edge portion in terms of strength, which contributes to shortening the length of the unshaved portion. The hardness of the surface of the inclined surface of the cutting edge is increased by the work hardening of the coining, so that the life of sharp beard shaving can be extended. Further, such a cutting edge shaping step also has the effect of correcting the shape of the entire cutting edge that has been deformed in the previous step of drilling, and the orientation, arrangement, etc. of a large number of cutting edges can be adjusted.

When the whisker guiding surface is provided in the cutting edge shaping step, the surface opening side of the beard introducing hole can be widened, or a tapered surface or a sloped surface can be provided. As a result, the hair collection effect is enhanced, so that the beard shaving ability can be improved.

In the above-described beard-introducing-hole forming step, when all the beard-introducing holes are not punched by a single shear press process but are formed stepwise by repeating the dispersive drilling step, Since the peripheral part can be clamped during drilling, adjacent beard introduction holes can be drilled, and even with thin plate materials, some deformation is possible without breaking the cutting edge part between adjacent beard introduction holes. Although it occurs, it is possible to perform sufficiently satisfactory drilling by shear press working.

When the outer blade is an outer blade of a rotary electric razor having a large number of beard introducing holes arranged in a rotationally symmetric manner, the beard introducing hole forming step includes a plurality of evenly-spaced circumferentially arranged beard introducing holes. It is desirable that the method comprises repeated operations of the circumferentially implantable hole forming step for forming the beard introducing hole. Rather than intensively or densely making a large number of holes at once, the holes are dispersed throughout and made in multiple times.

In particular, when the number of the beard introducing holes to be drilled in each circumferential implanting type drilling step is made equal, the force applied to the thin plate material does not become large, so that the cutting edge is effectively broken. Can be prevented.

[Brief description of drawings]

FIG. 1 is a plan view showing a work after forming a hollow hole in an embodiment of a method for manufacturing an outer blade of an electric razor according to the present invention.

FIG. 2 is a plan view showing a work after the first beard introducing hole formation in the embodiment of the method for manufacturing the outer blade of the electric razor according to the present invention.

FIG. 3 is a plan view showing the work after the second beard introducing hole formation in the embodiment of the method for manufacturing the outer blade of the electric razor according to the present invention.

FIG. 4 is a plan view showing the work after the third beard introducing hole formation in the embodiment of the method for manufacturing the outer blade of the electric razor according to the present invention.

FIG. 5 is a plan view showing the work after the fourth beard introducing hole formation in the embodiment of the method for manufacturing the outer blade of the electric razor according to the present invention.

FIG. 6A is an enlarged plan view showing a beard introducing hole portion of the work after the fourth beard introducing hole forming in the embodiment of the method for manufacturing the outer blade of the electric razor according to the present invention. )
FIG. 7 is a sectional view showing a state of being cut along the line BB ′ of FIG.

FIG. 7A is an enlarged plan view showing a beard introduction hole portion of a work after a cutting edge portion shaping step in an embodiment of a method for manufacturing an outer blade of an electric razor according to the present invention, and FIG. 7
7A is a cross-sectional view showing a state taken along the line CC ′ of FIG. 7A, and FIG. 7B is a cross-sectional view showing a state taken along the line DD ′ of FIG. 7C.

FIG. 8 is a plan view showing the work after the edge cutting step in the embodiment of the method for manufacturing the outer blade of the electric razor according to the present invention.

9A is a plan view showing a work after drawing press working in an embodiment of a method for manufacturing an outer blade of an electric razor according to the present invention, and FIG. 9B is a side view thereof.

FIG. 10 is a cut perspective view showing an example of an outer blade of a rotary electric razor.

11A to 11C are process cross-sectional views in a method for manufacturing an outer blade of a conventional rotary electric razor.

FIG. 12 (a) is a cross-sectional view of a cutting edge portion taken along the line AA ′ in FIG. 10 after milling in a conventional method for manufacturing an outer blade of a rotary electric razor, and FIG. FIG. 11 is a cross-sectional view of the cutting edge portion cut along the line AA ′ in FIG. 10 after the buffing step in the method for manufacturing the outer blade of the rotary electric razor of FIG.

[Explanation of symbols]

W ... sheet material of the workpiece W ₁ ... front W ₂ ... back 10 ... medium drain hole (discard hole) 11 ... pilot hole 12 ... hair introduction openings (slits) 13 ... cutting edge 13a ... edge inclined surface 13b ... beard induction surface. S ₀ ... shear plane S ₁ ... sag surface S ₂ ... fracture surface α ... cutting edge angle.

Claims (7)

[Claims] 1. A method for manufacturing an outer blade of an electric razor having a large number of mustache introducing holes, wherein a thin plate material is prepared, and the whiskers introducing hole is formed by punching a thin plate material to form the mustache introducing holes. And a step of forming an outer blade with a three-dimensional shape of the outer blade by squeezing and pressing the formed material with a beard introducing hole, a method of manufacturing an outer blade of an electric razor. 2. The method for manufacturing an outer blade of an electric razor according to claim 1, further comprising a step of polishing or lapping the back side after the outer blade forming step. A method for manufacturing an outer blade of an electric razor. 3. The method for manufacturing an outer blade of an electric razor according to claim 1 or 2, wherein the beard introduction hole is formed between the beard introduction hole forming step and the outer blade forming step. A method of manufacturing an outer blade of an electric razor, comprising a step of shaping a cutting edge portion of a raw material by press-pressing a cutting surface of the beard introducing hole to provide a blade edge inclined surface. 4. The method for manufacturing an outer blade of an electric razor according to claim 1 or 2, wherein the beard introduction hole is formed between the beard introduction hole forming step and the outer blade forming step. Manufacture of an outer blade for an electric razor, which comprises a step of shaping the cutting edge portion of the material by compression pressing the cutting surface of the beard introducing hole to provide a beveled edge surface and a beard guiding surface. Method. 5. The method for manufacturing an outer blade of an electric razor according to claim 1, wherein the beard introduction hole forming step comprises repeated dispersive hole forming steps. Method for manufacturing outer blade of electric razor. 6. The method for manufacturing an outer blade of an electric razor according to claim 1, wherein the outer blade comprises a plurality of the whisker introducing holes arranged in a rotationally symmetrical manner. The outer blade of the above, wherein the beard introducing hole forming step is a repetitive operation of a circumferentially implantable hole forming step for forming a plurality of the beard introducing holes arranged at equal intervals along the circumference. A method for manufacturing an outer blade of an electric razor. 7. The method for manufacturing an outer blade of an electric razor according to any one of claims 1 to 6, wherein the thin plate material is a stainless material and the plate thickness is 0.1 mm to 0.3 mm.
A method for manufacturing an outer blade of an electric razor, characterized in that