JP2919179B2 - Box processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box processing method,
More specifically, the present invention relates to a technique for improving the butting accuracy of a first bent piece and a second bent piece when a substrate is bent in an L shape.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
A first bent piece 2 substantially perpendicular to the substrate 1 is bent at the edge of the second bent piece, and a second fold perpendicular to the first bent piece 2 and substantially parallel to the substrate 1 is formed at the tip of the first bent piece 2. Piece 3 is bent,
The third bent piece 8 is bent substantially parallel to the first bent piece 2 from the tip of the second bent piece 3, and the fourth bent piece 9 is attached to the substrate 1 from the end of the third bent piece 8. Bent approximately parallel, and the first bent piece 2,
The second bent piece 3, the third bent piece 8, and the fourth bent piece 9 are punched in a substantially V-shape, and the substrate 1 is bent at a substantially right angle at the punched portion, and the first bent piece 2, In a box processing method in which the second bent piece 3, the third bent piece 8, and the fourth bent piece 9 are abutted at their punched edges, FIG.
As shown in FIG. 1A, a substrate 1, a first bent piece 2, a second bent piece 3, a third bent piece 8, and a fourth bent piece 9 are punched from a flat plate in a developed shape. When the substrate 1 is bent into an L-shape, the first bent piece 2, the second bent piece 3, the third
The first bent piece 2, the second bent piece 3, and the fourth bent piece 9 are punched in a substantially V-shape in advance so that the edges of the bent piece 8 and the fourth bent piece 9 come into contact with each other. 10 are formed in advance (see FIG. 4A). Then, with two press machines,
The substrate 1 is bent into an L-shape at the substantially V-shaped punching section 10 (see FIG. 4B), and the first bent piece 2, the second bent piece 3, the third bent piece 8, and The edges of the punched portion 10 of the fourth bent piece 9 are butted against each other (see FIG. 4C).

[0003]

However, in such a processing method, the first bent piece 2, the second bent piece 3, the third bent piece 8, and the third bent piece 8 on both sides of the substantially V-shaped punched portion 10 are provided. There is a problem that it is difficult to match the bending angles of the fourth bent pieces 9 and to match the positions of these bending lines.
Therefore, in order to correct variations in the bending angle and the position of the bending line, chamfering and polishing are performed by a belt polishing machine B as shown in FIG.

An object of the present invention is to solve such a problem, and an object of the present invention is to vary the bending angles and positions of bending lines of a first bent piece and a second bent piece to be butt-connected. It is an object of the present invention to provide a box processing method that can correct the above and can satisfactorily abut the edges of the first bent piece and the second bent piece.

[0005]

According to the present invention, a first bent piece 2 substantially perpendicular to the substrate 1 is bent at an edge of the substrate 1,
A second bent piece 3 orthogonal to the first bent piece 2 and substantially parallel to the substrate 1 is bent at the tip of the first bent piece 2, and the first bent piece 2 and the second bent piece 3 are provided. Is punched into a substantially V shape, the substrate 1 is bent at a substantially right angle at the punched portion, and the first bent piece 2 and the second bent piece 3 are abutted at the punched edge. And the substrate 1, the first bent piece 2, the second bent piece 3, and the third bent
When the pieces 8 are punched in a series, the cutout portion 7 is formed by punching out the portion that is punched out in a substantially V-shape in the second bent piece 3 that is substantially parallel to the substrate 1 when formed in the box shape. And the third bent piece 8 orthogonal to the substrate 1
Forming a pilots hole 11 advance, bending the first bending piece 2 and the second bending piece 3 in tabular intermediate punched 5 punched from the flat original plate, then pilot punch 6
The top pin 13 is inserted into the pilot hole 11, and the punch 6 is passed through the cutout portion 7 of the second bent piece 3, and the third bent piece 8 and the first fold that are flat in the traveling direction of the punch 6 are formed . The bent piece 2 is punched out, and thereafter, the substrate 1 is bent at a substantially right angle at the punched portion so that the punched edges of the first bent piece 2 are punched by the punch 6 and the cutout portion 7 in the second bent piece 3 is formed. Are characterized by abutting the cut edges.

[0006]

After the first bent piece 2 and the second bent piece 3 are bent, the punch 6 is passed through the cutout portion 7 of the second bent piece 3 having a vertical plate shape with respect to the punch 6, The first bent piece 2 having a flat shape is punched out from the punch 6. By punching such a punch 6, the first bent piece 2 and the second bent piece 2 on both sides of the punch
The variation in the bending angle and the position of the bending line of the bent piece 3 is corrected. The first bent piece 2 and the second bent piece 3 are properly butted. Since the cutout 7 is formed in the second bent piece 3 in advance, there is no problem in punching by the punch 6. In addition, the third bent piece 8 orthogonal to the substrate 1
A lot hole 11 is formed in advance, and a pilot
Of the punch 6 by inserting the pin 13 into the pilot hole 11
Folded piece 8 and first folded piece, which are flat in the direction
Punch out piece 2 so punch with punch 6
Positioning with substrate 1 and punching as set
Can do it.

[0007]

As shown in FIG. 1A, a substrate 1, a first bent piece 2, a second bent piece 3, a third bent piece 8, and a fourth bent piece 9 were connected from a flat plate. Punch a series in the state. In such a case, the substrate 1 is folded into an L-shape at the second bent piece 3 and the fourth bent piece 9 which are substantially parallel to the substrate 1 when formed in the box shape shown in FIG. Before bending, a portion to be punched into a substantially V shape is punched in advance to form a cutout portion 7 (shown by a dotted area A in FIG. 2A). Furthermore, the third bent piece 8
, A pilot hole 11 is punched and formed. Then, as shown in FIG. 2C, a chamfered portion 12 is formed at the edge of the cutout portion 7 at the time of punching with a punch 6 described later with a radius of about 0.6 mm. Then, a flat intermediate punched product 5 punched from a flat plate original plate
In FIG. 1B, on both sides of the punched portion 10
As shown in (1), the first bent piece 2, the second bent piece 3, the third bent piece 8, and the fourth bent piece 9 are bent by two press devices. In such a case, the second bent piece 3 and the fourth bent piece 9 are formed substantially parallel to the substrate 1. Next, FIG. 1C, FIG.
As shown in (a), the pilot pin 13 of the punch 6 is inserted into the pilot hole 11, the punch 6 is passed through the cutout portion 7 of the fourth bent piece 9 and the second bent piece 3, and the cutout is performed. Chamfering is performed at the edge of the portion 7, and the punched portion 10 is formed by punching the third bent piece 8 and the first bent piece 2 together with the punch 6 and the die block 14 at the locations indicated by the shaded area B in FIG.
Is formed. Next, as shown in FIG.
The substrate 1 is bent, and the first bent pieces 2 on both sides of the bent portion,
That is, the second bent piece 3, the third bent piece 8, and the fourth bent piece 9 abut each other. In the TIG welding of the inert gas welding, the burrs formed by the chamfering by the punch 6 are effectively used for butt welding at the edges of the first bent piece 2 and the third bent piece 8. In addition, it is possible to automate welding by avoiding replenishment of the overlay.

After the first bent piece 2, the second bent piece 3, the third bent piece 8, and the fourth bent piece 9 are bent as described above, the punch 6 is attached to the punch 6. Since the third bent piece 8 and the first bent piece 2 having a flat plate shape are punched out of the punch 6 through the cutout portion 7 of the fourth bent piece 9 and the second bent piece 3 each having a vertical plate shape. is there. By punching such a punch 6,
The variation of the bending angle and the position of the bending line of the first bent piece 2, the second bent piece 3, the third bent piece 8, and the fourth bent piece 9 on both sides of the punching are corrected. Thus, the first bent piece 2, the second bent piece 3, the third bent piece 8, and the fourth bent piece 9 are properly butted. The cutout 7 is formed in the fourth bent piece 9 and the second bent piece 3 in advance, so that there is no problem in punching by the punch 6.

FIG. 3 shows an apparatus for performing punching by the punch 6. The punch 6 is lowered along the guide 18 within the range of the stroke S via the pressing body 16, and the left and right sides of the punch 6 are subjected to intermediate molding as a workpiece. Goods holding device 17,
Hold down at 17 and finish punching when the punch 6 descends.
The punch 6 can be pushed up by the push-up spring 19. In the drawing, reference numeral 20 denotes a peephole for confirming whether or not the pilot pin 13 has entered the pilot hole 11. 21 is an ejector pin.

By the way, as shown in FIG. 1B, a pilot through hole is formed at the longitudinal end of the third bent piece 8 and the first bent piece 2 which are substantially perpendicular to the substrate 1. A pilot pin (not shown) of a punch (not shown) provided on this side is formed so as to be able to be punched in a cutting area c shown in FIG. 1 (e).

In the embodiment, the third bent piece 8 and the fourth bent piece 9 are formed following the first bent piece 2 and the second bent piece 3, but the number of bent pieces is larger than that. May be formed, and the third bent piece 8 and the fourth bent piece 9 may not be provided.

[0012]

According to the present invention, as described above, when a substrate, a first bent piece, and a second bent piece are punched out of a flat original plate in a series, when the board is formed in a box shape, it is substantially parallel to the substrate. A cutout is formed by punching out a portion of the second bent piece that is punched in a substantially V shape, and the first bent piece and the second bent piece are cut out of a flat intermediate punched product punched from a flat plate original plate. After the punch, the punch is passed through the cut portion of the second bent piece to punch out the first bent piece that is flat in the traveling direction of the punch, and then the substrate is bent at a substantially right angle at the punched portion. Then, the punched edges of the first bent piece by the punch are matched with each other, and the cut edges of the cut portion of the second bent piece are matched with each other. That is, the bending of the first bent piece and the second bent piece is performed. After processing, the punch is Through the cutout portion of the second bent piece which is formed into a vertical plate, and punches out the first bent piece which is formed in a flat plate shape with respect to the punch. And after the bending of the second bent piece, the punching by such a punch causes variations in the bending angles and the positions of the bending lines of the first bent piece and the second bent piece on both sides of the punching. Can be corrected, and the first bent piece and the second bent piece can be satisfactorily butted. In such a case, a cutout portion is formed in advance on the second bent piece, so that there is no problem in punching by the punch. Moreover, the third bent piece orthogonal to the substrate
A pilot hole is formed in the
The pilot into the pilot hole and
Punching the 3rd bent piece and the 1st bent piece that are planar
From the pilot hole of the punch,
Position of the punch and punching substrate
Make the arrangement and punch as set
Can be.

[Brief description of the drawings]

FIG. 1 shows a processing step of an embodiment of the present invention, and (a)
(B), (c) and (d) are perspective views, and (e) is a perspective view showing a punched portion.

2A is a perspective view illustrating punching with a punch, FIG. 2B is a perspective view illustrating a chamfered portion near a cutout, and FIG. 2C is a cross-sectional view.

FIG. 3 is a schematic sectional view showing the punching device of the above.

FIGS. 4A to 4C show processing steps of a conventional example, in which FIGS.
(D) is a perspective view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 1st bending piece 3 2nd bending piece 5 Intermediately punched product 6 Punch 7 Cutting part

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁶ , DB name) B21D 51/52 B21D 5/01 B21D 28/00 B21D 35/00

Claims (1)

(57) [Claims] A first bent piece substantially perpendicular to the substrate is bent at an edge of the substrate, and a second bent piece is formed at a tip of the first bent piece so as to be orthogonal to the first bent piece and substantially parallel to the substrate. The bent piece is bent, the first bent piece and the second bent piece are punched into a substantially V shape, and the substrate is bent at a substantially right angle at the punched portion, and the first bent piece and the second bent piece are bent. A box processing method in which a bent piece is abutted at its punching edge, wherein the substrate, the first bent piece, the second bent piece, and the third bent piece are punched out of a flat plate original in a series. A cutout portion is formed by punching out the above-mentioned substantially V-shaped portion of the second bent piece which is substantially parallel to the substrate when formed into a shape, and a third bent piece orthogonal to the substrate. Pilot hole on
The first bent piece and the second bent piece are bent in a plate-shaped intermediate punched product punched from a flat plate,
After that, insert the pilot pin of the punch into the pilot hole
Then, the punch is passed through the cutout portion of the second bent piece, and the third bent piece and the first bent piece that are flat in the traveling direction of the punch are punched. Thereafter, the substrate is substantially cut at the punched portion. A box processing method, comprising bending at a right angle and abutting punched edges of a first bent piece with a punch and abutting cut edges of a cut portion of a second bent piece.