JP2643682B2 - Bending box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bent box formed by bending a single metal plate.

[0002]

2. Description of the Related Art As shown in FIG. 11, a pair of long sides of a rectangular base plate "a"
In some cases, the side plates b are separately and integrally connected and bent, and the second side plates c are separately and integrally connected and bent on a pair of short sides of the base plate a.

[0003] In order to form this type of box, besides using a press die conforming to the shape of the formed box, there is also a case where a bending machine commonly called a panel bender is used. Press dies are suitable for mass production, but are not suitable for high-mix low-volume production in terms of cost. On the other hand, the bending machine is suitable for the production of many kinds and small quantities from the viewpoint of cost.

That is, a bending machine holds a blank between an upper surface of a fixed die and a lower surface of a pressure pad which can move up and down, and a portion to be bent of the blank is formed between a die and a cutting edge of the pressure pad. Project from
The upper punch or the lower punch that moves up and down with respect to the die and the pressure pad is moved up and down, and thereby, the portion to be bent is bent at a right angle. The pressure pad of this molding machine has a required number of segment molds attached to both sides of a central block mold, and the segment molds are increased or decreased according to the length of the blank to be bent. Therefore, it is possible to cope with bending of various types by adjusting the pressure pad to increase or decrease the segment type.

In order to form the bent box shown in FIG. 11 using such a bending machine, a blank d shown in FIG. 10 has been used. In the figure, e indicates the base plate a and the first
An expected bending line that forms a boundary with the side plate b, and f is an expected bending line that forms a boundary between the base plate a and the second side plate portion c. The length of the planned bending line e is the same as the total length of the first side plate b, and the length of the planned bending line f is the same as the total length of the second side plate c. Expected bending line f
It is longer than.

[0006] Therefore, the blank d in the bending machine
When the first side plate b is bent with respect to the base plate a, the length of the pressure pad is adjusted to a length adapted to the length of the expected bending line e, and the first side plate b is bent. When the second side plate c is bent with respect to the base plate a, the length of the pressure pad is adjusted to a short length suitable for the length of the expected bending line f, and the second side plate c is bent. Bending is performed.

[0007]

In the bending box having the above-mentioned structure, when the box is manufactured by the bending machine, the pressure pad is adjusted to the predetermined bending lines e and f having different lengths. Need to adjust the length of
The folding machine must be stopped for each adjustment. Therefore, there is a problem in that it takes time and effort to adjust the pressure pad and also that the operability of the bending machine decreases.

The first and second side plates b and b are formed by using a pressure pad adjusted to the long bending line e.
When any one of the pressure pads is bent, the bent side plate hinders the next setting of the pressure pad. The plates b and c can be bent, and in this case, the operability can be improved. However, in this case, the entire bending line e cannot be held down by the pressure pad, and the portion of the bending portion protruding from the pressure pad is distorted or twisted due to the bending. Therefore, it is not preferable to perform the bending in this manner.

SUMMARY OF THE INVENTION An object of the present invention is to bend and bend by a bending machine, which does not cause any undesired deformation at the time of the bending and improves the operability of the bending machine. An object of the present invention is to obtain a bent box.

[0010]

According to the present invention, there is provided a base plate having a quadrangular shape, a pair of first side plates which are separately and integrally connected to one pair of sides of the base plate, and a pair of first side plates. The present invention is applied to a sheet metal bending-molded box having a pair of second side plates that are separately and continuously connected to a pair of other sides, respectively, and are bent. At four corners formed by the side plate and the second side plate, at least corner holes formed by cutout grooves provided at least in the first side plate are provided. The distance between the corner holes, which is obtained by subtracting twice the cut depth of the notch groove based on both longitudinal ends of the side plate, is equal to or greater than the total length of the second side plate. It is shortened.

[0011]

In the structure of the bent box according to the present invention, part 4
Since the corner holes provided in the two corner portions are formed at least by the cut grooves provided in the first side plate, the length of the line to be bent between the base plate and the first side plate connected to one side of the base plate is formed. The length is reduced according to the cutting depth of the cutting groove. Thereby, the interval between the corner holes in the first side plate is made equal to or shorter than the total length of the second side plate. The predetermined bending line between the plate and the second side plate connected to the pair of other sides can be equal to or shorter than the bending line.

Therefore, when a bending machine is used to bend a rectangular bending box, for example, a pressure pad for holding down the short side of the base plate is used as it is, and this pad is used to form the long side of the base plate. And the notch groove forming the corner hole in the bending process of the first side plate while pressing the long side of the base plate,
Because it is located protruding from the pressure pad,
In this protruding portion, the molding force applied from the pressure pad over the base plate and the first side plate does not act.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 2 shows a bent box made of sheet metal according to a first embodiment of the present invention. This box 1 is composed of one blank 2 punched out as shown in FIG. Is formed by bending using a bending machine shown in FIG.

The bent box 1 comprises a base plate 3 having a rectangular shape, a pair of first side plates 4 which are separately and integrally connected to a pair of long sides of the base plate 3, and a base plate 3.
And a pair of second side plates 5 which are separately and integrally connected to each other and bent. Note that this embodiment is the simplest basic model, and in the actual molded box, the side plates 4 and 5 are subjected to edge bending and other necessary bending.

Each of the first side plates 4 has a ridge line that is to be bent 6 (indicated by a dotted line in FIG. 1), which is a boundary between the first side plates 4 and the base plate 3, and is perpendicular to the base plate 3. It is provided by bending. Similarly, both second
The side plate 5 is also provided by bending at a right angle to the base plate 3 so that an expected bending line 7 (indicated by a dotted line in FIG. 1), which is a boundary between these and the base plate 3, is set as a ridgeline. ing. The first and second side plates 4 and 5
Are connected to each other by spot welding or other connecting means, if necessary.

At four corners formed by the base plate 3, the first side plate 4, and the second side plate 5, corner holes 9 (see FIG. 2) formed by cutout grooves 8 (see FIG. 1) are provided. Have been.
The notch 8 is provided at the same time when the blank 2 is punched, and in the case of this embodiment, as shown in FIG.
And a first side plate 4 and a second side plate 5, and has a circular configuration drawn around a point P shown in FIG. 1.

Therefore, since the notch grooves 8 are located at both ends of the first side plate 4, the length A of the anticipated bending line 6 assumed between them is reduced by the first side plate 4.
Is shorter than the total length dimension B of. The length A of the predetermined bending line 6 is obtained by subtracting twice the cutting depth C of the cutout groove 8 based on the lengthwise ends of the first side plate 4 from the total length B of the first side plate 4. It is the same as the interval dimension A 'between the corner holes 9 (see FIG. 2). The length A of the predetermined bending line 6 and the distance A ′ are set to be equal to or shorter than the total length D of the second side plate 5.

The bending machine for bending the blank 2 shown in FIG. 1 comprises a fixed die 11 having a flat upper surface as shown in FIGS. 3 to 5, and a pressure vertically movable with respect to the upper surface. A pad 12 and an upper punch 13 and a lower punch 14 that move up and down with respect to the die 11 and the pressure pad 12 are provided.

The fixed die 11 extends long in a direction perpendicular to the plane of FIG. 3 and has a tapered tip 11a at the upper end protruding forward. The bent portion of the blank 2 can be positioned in the space below the cutting edge 11a.

A pressure pad 12 for holding the blank 2 between itself and the upper surface of the die 11 is provided movably in the vertical direction indicated by arrows xu and xd in FIG.
Like FIG. 1, it extends long in a direction perpendicular to the paper surface of FIG. The lower end of the pressure pad 12 is also provided with a tapered tip 12a which projects forward and can be disposed so as to overlap the blade 11a, and the blank 2 is bent in a space above the blade 12a. The designated part can be located.

The upper punch 13 and the lower punch 14 are arranged on the front side of the die 11 and the pressure pad 12, and are arranged in the vertical direction indicated by arrows xu and xd and arrows yf and yb in FIG.
Are provided so as to be movable in the front-rear direction indicated by. In order to bend the blank 2 sandwiched between the die 11 and the pressure pad 12, the upper punch 13 is lowered in the direction of the arrow xd, and the lower punch 14 is raised in the direction of the arrow xu. The punch that is not used is retracted out of the way.
The movement of the upper and lower punches 13 and 14 in the directions of the arrows yf and yb depends on the thickness of the blank 2 and the like.
This is for adjusting the position in the front-rear direction with respect to the leading edge of the tip 12a.

The pressure pad 12 is shown in FIGS.
As shown in FIG. 1, a required number of segment molds 16 are attached to both sides of a central block mold 15 which is detachably supported by a lifting device (not shown). The number of the segment molds 16 having the same configuration is increased or decreased according to the size of the box to be formed by bending, and the increase or decrease is performed by removing the center block mold 15 and utilizing the cutout mark. Done.
When only the central block type 15 is used, the length dimension X of the block type 15 is
Is formed, for example, 220 mm, and the thickness Y of the segment mold 16 connected to the central block mold 15 as necessary is, for example, 16.5 mm.

In order to form the bending box 1 shown in FIG. 2 by the bending machine, the length of the pressure pad 12 in the bending machine is adjusted according to the blank 2 to be bent. . The basis for this adjustment is the second side plate 5 of the blank 2, and the length E (see FIG. 1) of the pressure pad 12 is adjusted so as to be substantially the same as the total length D of the side plate 5.

After this adjustment, first, the blank 2 is supplied to the upper surface of the die 11, and then the pressure pad 12 is lowered and clamped between the pressure pad 12 and the die 11 as shown in FIG. In this case, the setting of the blank 2 on the upper surface of the die 11 is performed by moving one of the second side plates 5 shorter than the first side plate 4 of the blank 2 forwardly from the cutting edges 11a, 12a of the die 11 and the pressure pad 12. Let it protrude,
The expected bending line 7 between the one second side plate 5 and the base plate 3 is made to coincide with the leading edge of the cutting edge 11a. Next, the upper punch 13 is lowered, whereby the one second side plate 5 is bent downward at right angles to the base plate 3. In this L-shaped bending, the cutting edge 11a of the die 11 is used as a reference for bending.

After the first bending step, the pressure pad 12 and the upper punch 13 are respectively raised, and the blank 2
Is rotated 180 ° horizontally, and the blank 2 is sandwiched between the die 11 and the pressure pad 12 in the same manner as in the first bending step. In this case, since the width of the die 11 in the front-rear direction is smaller than the width between the predetermined bending lines 7, the one second side plate 5 bent earlier does not obstruct the sandwiching. Then, the upper punch 13 is lowered again, whereby the other second side plate 5 protruding forward from both the cutting edge portions 11a and 12a is bent downward at right angles to the base plate 3.

After the second bending step, the pressure pad 12 and the upper punch 13 are respectively raised, and the blank 2 is turned over so that the bent second side plate 5 faces upward. (4) By rotating horizontally, one of the first side plates 4 is brought into contact with the die 11 and the pressure pad 1
In addition to projecting forward from the second blade edge portions 11a and 12a, the expected bending line 6 between the one first side plate 4 and the base plate 3 coincides with the leading edge of the blade edge portion 11a. next,
Pressure pad 1 used in the first and first bending steps
Use 2 as is and lower it.

Then, the pressure pad 12 enters the bent second side plate 5 without hitting the second side plate 5, and clamps the blank 2 with the die 11. This sandwiching is performed by cutting depth C of notch groove 8 in blank 2.
And the distance A ′ between the corner holes 9 based thereon and the total length D of the second side plate 5. The relationship between the blank 2 and the pressure pad 12 in this state is shown in FIG.

Thereafter, the lower punch 14 is raised, whereby the one first side plate 4 is bent upward at right angles to the base plate 3. In this L-shaped bending, the cutting edge 12a of the pressure pad 12 is used as a reference for bending.

After the third bending step, the pressure pad 12 and the upper punch 13 are respectively raised, and the blank 2
Is rotated horizontally by 180 °, and the blank 2 is sandwiched between the die 11 and the pressure pad 12 in the same manner as in the third bending step. In this case, pressure pad 1
The width of the second side plate 2 in the front-rear direction is smaller than the width between the lines to be bent 6, so that the first side plate 4 bent first does not obstruct the sandwiching. And again, the lower punch 14
Is lowered, and the other first side plate 4 protruding forward from both cutting edge portions 11a and 12a is thereby attached to the base plate 3
Fold downward at right angles to

As described above, the respective side plates 4 and 5 of the blank 2 are each bent to form the bent box 1. In this case, as described above, there is no need to adjust the length of the pressure pad 12 according to the difference in the length of the first and second side plates 4 and 5, and the above-described bending and forming operation can be performed. The mobility of the bending machine can be improved.

In place of the above-mentioned bending, one of the second side plates 5 of the blank 2 is bent upward at a right angle by raising the lower punch 14, and then the blank 2 is
回 動 Turn horizontally, and the other second side plate 5 of the blank 2 is bent upward at a right angle by raising the lower punch 1, and then the blank 2 is turned 90 ° horizontally on the die 11,
One of the first side plates 4 is bent upward at a right angle by raising the lower punch 14, and then the blank 2 is rotated 180 ° horizontally on the die 11, and the other first side plate 4 of the blank 2 is turned.
May be bent upward at a right angle by raising the lower punch 14 to form the bent-formed box 1. When the bending box 1 is bent in this manner, the blank 2 does not need to be turned upside down and only has to be rotated horizontally on the die 11. Efficiency can be improved. The upper punch 13 is used for bending the flanges of the side plates 4 and 5, for example.
It is used as necessary before the side plates 4 and 5 are bent by the lower punch 14.

In the above-mentioned bending, the first side plate 4
Although the lengths of the first side plate 4 and the second side plate 5 are different,
Since the die 11 and the pressure pad 12 do not protrude from the portion where the blank 2 is pressed by the die 11 and the part to be bent, the bent side of the first side plate 4 is bent. Does not cause any undesired deformation at the corners.

FIGS. 6 and 7 show a second embodiment of the present invention. In this embodiment, the cutout grooves 8 of the blank 2 are provided only in the first side plate 4 in a slit-like configuration. The configuration other than this point is the same as that of the first embodiment. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

In the second embodiment, for example, the total length D of the second side plate 5 is 220 mm, which is the same as the length X of the central block die 15 of the pressure pad 12, that is, the minimum length of the pressure pad 12. If the total length B of the first side plate 4 is 230 mm, the notch groove 8
Is provided with a cutting depth C of at least 5 mm.

Thus, in the bending machine shown in FIGS. 3 to 5, only the center block mold 15 is used for the pressure pad 12 and the second side plate 5 is subjected to the same steps as in the first embodiment. Is bent and then the first side plate 4 is bent, whereby the bent box 1 shown in FIG. 7 can be formed. In this molding, if one segment mold 16 is connected to both sides of the central block mold 15 of the pressure pad 12, the thickness of the segment mold 16 is 16.5 mm. Cannot be inserted between the bent second side plates 5, and the bending cannot be performed. Therefore, the intended object of the present invention can be achieved by providing the notch 8 as described above in the blank 2.

FIGS. 8 and 9 show first and second side plates 4a and 5a slightly longer than the minimum length of the pressure pad 12 of the bending machine shown in FIGS.
This shows an example in which the present invention is applied to a bending-molded box 1a having the following. In this example, as in the first embodiment, a circular cutout groove 8a drawn around the point P shown in FIG. 8 over the base plate 3a, the first side plate 4a, and the second side plate 5a in the blank 2a. Is provided.

Notch grooves 8 located at both ends of first side plate 4
a, the length H of the expected bending line 6a assumed between “a” and the length I of the expected bending line 7a assumed between the notch grooves 8a located at both ends of the second side plate 5a are as follows. Are the same, and are shorter than the total length J of both side plates 4a and 5a. Moreover, these lengths H and I are
The length X of the central block 15 which is the minimum length of the pressure pad 12 is set to be equal to or shorter than the length X. Therefore, the first side plate 4a (or the second side plate 5
From the total length H (or I) of a), these side plates 4a and 5
The distance A 'between the corner holes 9 expressed by subtracting twice the cut depth K of the cutout groove 8a with respect to both ends in the longitudinal direction of the central block die 15 is the length X of the central block die 15. It is the same as or shorter than that.

Then, such a blank 2a is attached to each of FIGS.
By bending using the bending machine shown in FIG. 5 through the same steps as in the first embodiment, each side plate 4a, 5a, which is slightly longer than the pressure pad 12, has a minimum length of 220 mm. The bent box 1a shown in FIG. 9 can be bent without bending and causing undesired deformation at the corners.

[0040]

As described above in detail, according to the present invention, at least four corners are formed by the cut grooves provided in the first side plate, and are connected to the base plate and one pair of sides thereof. Since the length of the line to be bent between the first side plate and the base plate is set to be equal to or shorter than the line to be bent between the base plate and the second side plate connected to the pair of other sides, the bending is performed. When molding using a molding machine, it is possible to use the pressure pad that presses the one side of the base plate as it is, and to press the other side of the base plate with this pad. Accordingly, the number of steps for adjusting the length of the pressure pad and the rest period are omitted, and the operability of the bending machine can be improved. Moreover, when bending
The cutout grooves forming the corner holes do not cause any undesired deformation at the corners of the molded box, and the quality of the bent box can be improved.

[Brief description of the drawings]

FIG. 1 is an expanded view of a bent box according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a bent box according to the first embodiment.

FIG. 3 is a view showing a configuration of a bending machine for forming a bending box.

FIG. 4 is a perspective view showing a state in which a bending machine sandwiches a blank.

FIG. 5 is a front view showing a part of a pressure pad provided in the bending machine.

FIG. 6 is an expanded view of a bent box according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing a bent box according to the second embodiment.

FIG. 8 is an expanded view of a bent box according to a third embodiment of the present invention.

FIG. 9 is a perspective view showing a bent box according to the third embodiment.

FIG. 10 is an expanded view of a bent box according to a conventional example.

FIG. 11 is a perspective view showing a bent box according to the conventional example.

[Explanation of symbols]

1: Bending box, 2: Blank, 3: Base plate, 4:
1st side plate, 5 ... 2nd side plate, 8 ... Notch groove, 9 ... Corner hole, A '
… Interval between corner holes, B: total length of first side plate, C: depth of cut of notch groove, D: total length of second side plate.

Claims (1)

(57) [Claims] 1. A base plate having a quadrangular shape, a pair of first side plates separately and integrally bent on one pair of sides of the base plate, and a pair of first side plates separately formed on a pair of other sides of the base plate. In a bent box made of a sheet metal provided with a pair of second side plates bent integrally and continuously, at least four corners formed by the base plate, the first side plate, and the second side plate are provided. Each of the corner holes formed by the notch grooves provided in the first side plate is provided, and the notch depth of the notch groove based on the total length dimension of the first side plate with respect to both longitudinal ends of the first side plate is determined. A bent box characterized in that a space between the corner holes, which is expressed by subtracting twice the size, is equal to or shorter than a total length of the second side plate.