JP2571190B2 - Method for manufacturing sheet metal folded articles such as hair removal - Google Patents

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 a folded sheet metal article such as a pliers or tweezers, and more particularly to a method for manufacturing a folded sheet metal article having a thin portion and a thick portion.

[0002]

2. Description of the Related Art Conventionally, in hair removal and tweezers, a bent hinge portion is formed to be thin, an arm portion extending from the hinge portion is formed to be thick, and an opening and closing claw portion at a tip is formed to be thin. It is known that

[0003] Therefore, when manufacturing such a hair removal or tweezers, conventionally, a large number of products are molded from one sheet metal material. That is, after cutting a desired thin portion and a thick portion by applying a grinder to the surface of the sheet metal material and cutting, a plurality of intermediate products having the thin portion and the thick portion are punched and punched on the sheet metal material. Each of the extracted intermediate products is buffed and then bent to form a finished product. Such a series of steps is performed by a skilled craftsman by hand.

[0004]

The conventional method relies on craftsmanship and is not suitable for mass production and cannot improve productivity. For this reason, most of the hair removal and tweezers are manufactured in the cottage industry, and not only are there insufficient supplies of a large number of products corresponding to the needs of the market, but there is a possibility that the supply of future products will be cut off due to business closure or the like. . In addition, the manual operation is expensive and there is a regret not considering the consumer's profit.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a method of manufacturing a folded sheet metal article such as a plucker which enables mass production with high quality. The thickness forming step of forming a thin portion and a thick portion in the longitudinal direction while pressing a continuously fed tape-shaped sheet metal material with a pressing roll, and cutting the tape-shaped sheet metal material It comprises a dividing step of obtaining an intermediate product having the thin portion and the thick portion by separating, and a bending forming step of obtaining a finished product by bending the intermediate product.

Further, the present invention is constituted as a second means, in the thickness forming step, a tape-shaped sheet metal material is pressed by a pressing roll having a series of large diameter portions and small diameter portions provided in a circumferential direction. The large diameter portion forms a thin portion and the small diameter portion forms a thick portion.

Further, the present invention is configured as a third means. In the thickness forming step, a convex portion or a concave portion is formed on the tape-shaped sheet metal material by a concave portion or a convex portion provided on the outer peripheral portion of the pressing roll. In the dividing step, positioning is performed with respect to the cutting blade using the convex portion or the concave portion as a guide, and the sheet metal material is cut and separated after the positioning.

Further, the present invention is configured as a fourth means. When the thickness forming step and the dividing step are performed in series by the same pressing roll, a cutting blade is provided on an outer peripheral portion of the pressing roll, and the pressing blade is provided. The point is that the tape-shaped sheet metal material is cut and separated by the cutting blade at a portion where the formation of the thin portion and the thick portion is completed by pressure bonding of the roll.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

(First Embodiment) The first embodiment shown in FIGS.
In the embodiment, hair removal is shown as an example of a folded sheet metal article, and the manufacturing method is such that a tape-shaped sheet metal material 1 continuously fed is pressed with a pressing roll 2 while a thin portion 3 and a thick portion are formed in a longitudinal direction. A thick molding step for forming the meat portion 4;
A cutting step of obtaining an intermediate product 5 having the thin portion 3 and the thick portion 4 by cutting and separating the tape-shaped sheet metal material 1, and a folding process of obtaining a finished product 6 by bending the intermediate product 5. And a bending process.

As shown in FIG. 1 (A), a tape-shaped sheet metal material 1 provided for manufacturing a hair remover is a tape-shaped sheet metal having a predetermined constant thickness, and is preferably a spring made of stainless steel or the like. Made of steel with excellent properties. The width dimension of the tape-shaped sheet metal material 1 is the same as the width dimension of the hair removal obtained as the finished product 6, and is fed from a winding roll (not shown). The sheet metal material 1 may be supplied and transferred from a roll of a wound tape-shaped sheet metal. However, after the round wire is fed from a roll of a wound round wire, the tape-shaped sheet metal and It may be one that supplies and transfers while forming as it is.

The transferred tape-shaped sheet metal 1 is sent to a thick-wall forming step, where a thin portion 3 and a thick portion 4 are formed in the longitudinal direction by a pressing roll 2. As shown in FIG.
The pressing roll 2 is provided with a large diameter portion 7 and a small diameter portion 8 alternately arranged in a circumferential direction, and is pressed against the supporting roll 9 while allowing the tape-shaped sheet metal material 1 to pass therethrough. 1, thin portions 3 and thick portions 4 are alternately formed in the longitudinal direction. At this time, on both sides of the pressing roll 2, both side edges of the tape-shaped sheet metal material 1 are restrained by restraining means such as side rolls. Therefore, although the tape-shaped sheet metal material 1 is rolled in the longitudinal direction by the pressing roll 2, the width dimension is not changed before and after the pressure bonding without being rolled in the width direction.

In the illustrated embodiment, the pressing roll 2 is provided with a pair of large-diameter portions 7a and 7b on a peripheral surface located in a diametrically opposed manner, and a peripheral surface located between the large-diameter portions 7a and 7b. Are provided with a pair of small-diameter portions 8a and 8b, and the peripheral surface is substantially elliptical. Therefore, as shown in FIG. 2, the tape-shaped sheet metal material 1 starts from the thin portion 3b formed corresponding to the large-diameter portion 7b in order from the front side in the transport direction F,
A thick portion 4a formed corresponding to the small diameter portion 8a, a thin portion 3a formed corresponding to the large diameter portion 7a, and a thick portion 4b formed corresponding to the small diameter portion 8b; The thin portion 3b formed corresponding to the large diameter portion 7b is formed, whereby one cycle of the thick forming process corresponding to the intermediate product 5 is completed. That is, by this one cycle, the tape-shaped sheet metal material 1
Has a thin portion 3 at the center in the longitudinal direction corresponding to the intermediate product 5.
a, thick portions 4a and 4b are formed on both sides thereof, and thin portions 3b and 3b are formed on both sides thereof.

In the first embodiment, the pressing roll 2
Is a groove-shaped concave portion 1 formed in a large-diameter portion 7b where a thin portion 3b is to be formed.
0 is provided. For this reason, the convex portion 11 is formed simultaneously with the formation of the thin portion 3b. It is preferable that the concave portion 10 has a groove bottom formed in an arc shape.
Are formed over the entire width of the tape-shaped sheet metal material 1 in the form of ribs having an arc-shaped cross section.

Next, the tape-shaped sheet metal material 1 having passed through the above-mentioned thickness forming step is sent to a dividing step, where it is cut and divided into an intermediate product 5 as shown in FIG. 1 (C). In the dividing step, the positioning with respect to the cutting blade 12 is performed using the convex portion 11 as a guide, and the cutting is performed after the positioning. That is, the cutting blade 12 is provided with a guide groove 13 for fitting the convex portion 11, and stops the transfer of the tape-shaped sheet metal material 1 when the convex portion 11 comes to a position facing the guide groove 13. Therefore, as shown in FIG. 1 (D), if the cutting blade 12 is lowered even if the center lines of the guide groove 13 and the convex portion 11 do not coincide with each other, the guide groove 13 and the convex portion are formed by mutual cam action. 11 so that the sheet metal material 1
And / or the cutting blade 12 is relatively moved to align the center line and perform positioning, as shown in FIG. Therefore, when the cutting blade 12 is further lowered from this positioning state, as shown in FIG. 1F, a part of the thin portion 3b including the convex portion 11 is cut off, and the subsequent tape-shaped sheet metal material 1 is cut.
And the intermediate product 5 is cut and separated. The cut off portion is discarded as waste material 14. Therefore, the intermediate product 5
Is accurately cut at a desired position, and a product having high dimensional accuracy can be obtained.

The intermediate product 5 is subsequently sent to a bending process, where it is bent and formed into a finished product 6 with hair removal as shown in FIG. 1 (G). That is, the finished product 6
The hinge portion 1 having the central thin portion 3a bent in a folded shape.
5, arms 16 and 16 which extend from the hinge 15 in an arcuate manner and are constituted by the pair of thick portions 4a and 4b, and inwardly bent at the ends of the arms 16 and 16. And the cut thin portion 3
The opening and closing claw portions 17, 17 constituted by b, 3b are formed.

In the bending process, the finished product 6 includes the hinge portion 15, the arm portions 16, 16 and the open / close claw portion 1.
It is bent in the order of 7 and 17. For example, by using a multi-punch forming apparatus as shown in FIG. 3, the intermediate product 5 is fixed to the core 18 by an appropriate means, and is bent by a plurality of punches so as to conform to the outer periphery of the core 18. Is done. That is, first, the thin portion 3a is locally pressed by the first punch 19 projecting from below, whereby the hinge portion 15 is bent and formed. By this local pressurization, the hinge portion 15 hardens the stainless steel material and increases the spring force. Next, the base 16a of the arm 16 is formed near the hinge 15 by the second punch 20 projecting from obliquely below, and then the intermediate portion of the arm 16 is formed by the third punch 21 projecting from obliquely below slightly in the horizontal direction. 16b is molded. Thereafter, the vicinity of the distal end 16c of the arm portion 16 and the base of the opening / closing claw portion 17 are formed by the fourth punch 22 projecting obliquely from above, and finally, the opening / closing claw portions 17 and 17 are formed by the fifth punch 23 projecting from above.
Is molded. Although FIG. 3 shows only the upper and lower and left half punches of the finished product 6 for convenience, the right half is the same, and the punches are arranged symmetrically.

The finished product 6 obtained as described above may be supplied to the market as a final product without hair, or may be finished through an appropriate finishing step. For example, irregularities such as knurls and grooves directed in the width direction, which are non-slip when using hair removal, can be formed on the abutting surfaces of the opening / closing claws 17, 17.

In the present invention, an optional additional step may be formed during each step or between the steps. For example, a step of making an appropriate engraving or the like on the tape-shaped sheet metal material 1 may be added. At this time, a forming plate for engraving can be attached to the pressing roll 2 or the supporting roll 9.

It is preferable that the facing surface of the opening / closing claw portions 17, 17 of the hairless article abuts by surface contact. For this reason, as shown in FIG.
It is preferable to provide the inclined surface 12a and to incline the cut surface of the intermediate product 5 at a predetermined angle.

(Modification) In the first embodiment, the configuration in which the convex portion 11 is formed on the tape-shaped sheet metal material 1 by providing the concave portion 10 in the pressing roll 2 has been described. The tape-shaped sheet metal material 1 can be formed with a groove-shaped concave portion in the thickness forming step.

Therefore, in this modified embodiment, in the dividing step, the cutting blade 12 is provided with a guide convex portion instead of the above-described guide groove 13 (FIG. 1), so that the first cutting edge is provided.
As in the embodiment, the concave portion of the tape-shaped sheet metal material 1 and the cutting blade 1
With the two guide projections, a cam function for making the center lines coincide can be provided. That is, the cutting blade 1
The concave portion of the tape-shaped sheet metal material 1 can be positioned with respect to the circular arc surface by forming the guide convex portion provided at the center of 2 in an arc-shaped cross section, and the intermediate product 5 can be accurately positioned at a desired position. And dimensional accuracy can be guaranteed.

(Second Embodiment) In the second embodiment shown in FIGS. 4 and 5, a folded sheet metal article is cut off in the same manner as in the first embodiment. Also in the second embodiment, a step of transferring a tape-shaped sheet metal material 1 made of stainless steel or the like having a predetermined constant thickness as shown in FIG.
(B) and a thickness forming step of forming a thin portion 3 and a thick portion 4 in the longitudinal direction while pressing a tape-shaped sheet metal material 1 continuously fed as shown in FIG.
A cutting step of obtaining an intermediate product 5 having the thin portion 3 and the thick portion 4 by cutting and separating the tape-shaped sheet metal material 1, and bending and forming the intermediate product 5 as shown in FIG. This is the same as the first embodiment in the basic configuration including the bending and forming step of obtaining the finished product 6 by doing so. Therefore, only the differences from the first embodiment will be described, and the description above will be referred to for the other points, and FIG. 3 will be referred to for the bending process.

That is, in the second embodiment, the thickness forming step and the dividing step are performed in series by the same pressing roll 2. For this reason, the pressing roll 2 is provided with a cutting blade 24 instead of the concave portion 10 (FIG. 2) described in the first embodiment. As shown in FIG. 4, the cutting blade 24 is inserted into a cylinder 25 opened on the peripheral surface of the pressing roll 2,
The pressing roll 2 is configured to be able to protrude and retract from the outer periphery of the pressing roll 2 by a driving source such as hydraulic pressure.

Accordingly, the thick portions 4a, 4b and the thin portions 3a, 3a, 3b
At the time when one molding cycle of b is completed, a portion corresponding to the end of the intermediate product 5 can be cut and separated by the cutting blade 24. Also in this case, cutting at an accurate position is possible, and an intermediate product 5 with high dimensional accuracy can be obtained. Incidentally, for the same reason as described in the first embodiment, the open / close claw portions 17 and 1 in the finished product 6 are provided.
7 to obtain an abutment surface,
It is preferable to form a.

In addition to the configuration shown, the cutting blade 24
May be provided on the support roll 9. Further, the cutting blade 24
May be a fixed blade protruding from the outer peripheral surface of the roll, in addition to a configuration in which the roller can be retracted.

[0027]

According to the present invention, the large diameter portions 8a and 8b and the small diameter portions 7a and 7b of the pressing roll 2 are provided.
Since the desired thin portions 3a and 3b and the desired thick portions 4a and 4b are formed in the longitudinal direction of the tape-shaped sheet metal material 1 by b, workability is greatly improved as compared with conventional cutting. , The quality is uniform. And most of all, because it can be automated, mass production with high quality is possible. In addition, since the thickness forming step is performed while continuously feeding the tape-shaped sheet metal material 1, continuous processing is possible, and production with good yield can be achieved.

According to the third aspect of the present invention, when the tape-shaped sheet metal material 1 after the thick molding is cut to obtain an intermediate product, cutting at an accurate position is possible, and high dimensional accuracy is achieved. The intermediate product 5 can be manufactured, and as a result, a high quality finished product 6 can be supplied.

According to the fourth aspect of the present invention, since the thickness forming step and the dividing step are performed in series by the same pressing roll 2, excellent workability and quick processing are possible. There is an effect that the yield can be greatly improved, and high dimensional accuracy can be guaranteed by cutting at an accurate position.

[Brief description of the drawings]

1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a cross-sectional view showing a transferred tape-shaped sheet metal material, and FIG. 1B is a cross-sectional view showing a tape-shaped sheet metal material that has undergone a thick forming step. , (C)
Is a cross-sectional view showing the intermediate product having undergone the dividing step, (D) is an enlarged sectional view showing an initial state of the cutting blade in the dividing step,
(E) is an enlarged sectional view showing a cutting start state by the cutting blade, (F) is an enlarged sectional view showing a cutting end state by the cutting blade, and (G) is a sectional view showing a finished product after the bending process. It is.

FIG. 2 is a side view showing a thickness forming step in the first embodiment.

FIG. 3 is a sectional view showing a bending process in the first embodiment.

4A and 4B show a second embodiment of the present invention, wherein FIG. 4A is a cross-sectional view showing a tape-shaped sheet metal material transferred, and FIG. 4B is a series of a thick forming step and a dividing step. FIG. 4 is a cross-sectional view showing an intermediate product, (C) is an enlarged cross-sectional view showing a cutting blade of a pressing roll for performing a dividing step, and (D) is a cross-sectional view showing a completed product after a bending forming step.

FIG. 5 is a side view showing a thickness forming step and a dividing step in the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tape-shaped sheet metal material 2 Press roll 3 Thin part 4 Thick part 5 Intermediate product 6 Finished product 7 Large diameter part 8 Small diameter part 9 Support roll 10 Depression 11 Convex part 12 Cutting blade 13 Guide groove 15 Hinge part 16 Arm part 17 Opening / closing claw 18 Core 19-23 Punch 24 Cutting blade

Claims (4)

(57) [Claims] 1. A thick forming step of forming a thin portion and a thick portion in a longitudinal direction while pressing a tape-shaped sheet metal material continuously fed by a pressing roll, and cutting and separating the tape-shaped sheet metal material. And a folding process for obtaining a finished product by bending the intermediate product to obtain an intermediate product having the thin portion and the thick portion. A method of manufacturing a curved article. 2. In the thickness forming step, a tape-shaped sheet metal material is pressure-bonded by a pressing roll provided with a series of large-diameter portions and small-diameter portions in a circumferential direction, and a thin portion is formed by the large-diameter portions. The method according to claim 1, wherein a thick portion is formed by the small diameter portion. 3. A convex portion or a concave portion is formed on a tape-shaped sheet metal material by a concave portion or a convex portion provided on an outer peripheral portion of a pressing roll in the thickness forming step, and the convex portion or the concave portion is guided in the dividing step. The method according to claim 1 or 2, wherein the positioning is performed with respect to the cutting blade, and the sheet metal material is cut and separated after the positioning. 4. When the thickness forming step and the dividing step are performed in series by the same pressing roll, a cutting blade is provided on an outer peripheral portion of the pressing roll, and a thin portion and a thick portion are formed by pressing the pressing roll. The method according to claim 1 or 2, wherein the tape-shaped sheet metal material is cut and separated by the cutting blade at the completed portion.