JP2020203291A - Bent product and its manufacturing method - Google Patents

Abstract

To mold into a beautiful R shape by applying R bending to a hemming bending part without finishing.SOLUTION: In a bent product, which is a bent product formed by applying R bending to a hemming bending part made by folding back a flange part, the flange part has a plurality of slits in which at least each spot used as a bending start point and bending end point in a R bending region is formed so as to be included in a slit gap region before R bending, or to be positioned on its periphery.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bent sheet metal product and a method for producing the bent product.

In products such as sheet metal boxes and drawers, for example, at the edge of the product, the flange portion formed at the end of the base material is folded back (hemming bending is performed) to form a hemming bending portion. It is intentionally rounded (see, for example, Patent Document 1). Since the roundness of the edge eliminates the risk of amputation of the finger, the safety in handling the product can be improved.

Japanese Unexamined Patent Publication No. 2000-316651

However, since the hemming bending portion interferes with the processing die when the R bending processing is performed due to its structure, the R bending processing is performed as described in Patent Document 1 above. It is customary that it is not formed in the corners of the product. In this case, burrs remain on the edges of the product, so it is necessary to perform finishing processes such as corner finishing and burr finishing.

On the other hand, in order to avoid the above-mentioned finishing process, when the hemming bending portion is also formed in the corner portion and the R bending processing is performed, the folded flange portion bulges inward of the bending and at the same time. The so-called seagull bending phenomenon, in which the main body side of the product is deformed so as to spread outside the bending, tends to occur.

The present invention has been made in view of the above circumstances, and is a bent product and a bent product that can be formed into a beautiful R shape by performing R bending on the hemming bending portion without accompanying finishing processing. It is an object of the present invention to provide a manufacturing method.

The bent product according to the present invention is a bent product in which a hemming bent portion formed by folding back a flange portion is subjected to R bending, and the flange portion is at least a bending start point and a bending end point in the R bending region. Each of the locations is characterized by having a plurality of slits formed so as to be included in or in the vicinity of the slit gap region before the R bending process.

In one embodiment of the present invention, the slit is formed in a tapered shape in which one side wall in the R bending direction facing the slit gap region is inclined with respect to the other side wall.

In another embodiment of the present invention, the slit is formed so that the distance between the one side wall and the other side wall is maximized on the tip end side of the flange portion.

In still another embodiment of the present invention, the slit is formed so that the innermost portion of the slit is located at a position separated from the turn-back line of the hemming bending portion in the direction of the tip end of the flange portion.

The method for manufacturing a bent product according to the present invention is a method for manufacturing a bent product in which a hemming bent portion formed by folding back a flange portion is subjected to R bending, and a plurality of slits are formed in the flange portion of the work material. The first step of forming the hemming bending portion on the work material by folding back the flange portion along a folding line, and the R bending processing of the work material including the hemming bending processing portion. It is provided with an R bending process for forming the region into an R shape, and in the first step, at least the bending start point and the bending end point in the R bending region are included in the slit gap region before the R bending processing, respectively. It is characterized in that the plurality of slits are formed so as to be located in the vicinity thereof.

In one embodiment of the present invention, in the first step, the slit is tapered so that one side wall in the R bending direction facing the slit gap region is inclined with respect to the other side wall. To form.

In another embodiment of the present invention, in the first step, the slit is formed so that the innermost portion of the slit is located at a position farther from the folded line toward the tip of the flange portion.

In still another embodiment of the present invention, in the R bending step, a jig having a portion bent according to the R shape of the R bending so as to be pressed against the work material excluding the hemming bending portion is R. R-bending is performed after being attached to a bending punch.

In yet another embodiment of the present invention, the jig is detachably attached to the punch via a magnet.

According to the present invention, the hemming bending portion can be R-bent to form a beautiful R shape without any finishing process.

It is a perspective view which shows typically the whole structure of the bent-processed article which concerns on one Embodiment of this invention. It is a perspective view which shows the part of the bent product of FIG. 1 enlarged and schematic. It is a flowchart for demonstrating the manufacturing process of the bent product of FIG. It is a top view for demonstrating a part of the manufacturing process of the bent product of FIG. It is a top view which shows by enlarging a part of FIG. 4A. It is a front view which shows the modification of FIG. It is sectional drawing for demonstrating the R bending process of the bending-processed product of FIG. It is a cross-sectional view taken along the arrow A of FIG. FIG. 7 is a cross-sectional view taken along the line BB'of FIG. It is a perspective view which shows the whole structure of the bent-processed article which concerns on other Embodiments of this invention in cross-section. It is a top view for demonstrating the manufacturing process of the bent product.

Hereinafter, a bent product and a method for manufacturing the bent product according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the following embodiments do not limit the invention according to each claim, and not all combinations of features described in the embodiments are essential for the means for solving the invention. ..

[Composition of bent products]
First, the overall configuration of the bent product according to the present embodiment will be described with reference to FIGS. 1 and 2. Since the basic structure of a machine tool such as a press brake that performs bending for manufacturing a bent product is known, description thereof will be omitted here. Further, as the material of the bent product, sheet metal or paper material can be used, but here, sheet metal will be described as an example. Further, in the present embodiment, the scale and dimensions of each component may be exaggerated or some components may be omitted.

As shown in FIG. 1, the bent product according to the present embodiment is molded as, for example, a battery box 1 for accommodating a battery. The battery box 1 is formed in a box shape as a whole, has a side wall portion 2 forming a rectangular opening 1a, and has a lid portion (not shown) attached to the side wall portion 2 so that the opening 1a can be opened and closed. It has a bottom portion (not shown) that closes the bottom surface of the side wall portion 2.

The predetermined area near the opening end including the edge 3 on the opening 1a side of the side wall 2 surrounds the opening 1a including the four corners 2a that have been R-bent in the side wall 2. , The hemming bending processed portion 4 folded inward is formed. Although the hemming bending portion 4 will be described in detail later, the flange portion 5 formed at the end portion of the sheet metal material when the side wall portion 2 is in the expanded state is formed into a folded line (hemming bending line) 9 (FIG. 4 (a). ) Etc.), which is formed by folding back 180 ° toward the inner wall surface 2b side of the side wall portion 2.

As shown in FIG. 2, the flange portion 5 of the hemming bending portion 4 has at least an R bending region RA including the R bending center Rc of the R bending processing applied to the corner portion 2a of the side wall portion 2. A plurality of slits 6 are formed so as to meet the bending start point Rs and the bending end point Re, which are inflection points.

Specifically, the plurality of slits 6 are formed so that the bending start point Rs and the bending end point Re are included in the slit gap region 6s (see FIG. 5 and the like) of the slit 6 before the R bending process, respectively. Will be done. As a result, in the hemming bending portion 4, even if the R bending processing is performed at the corner portion 2a by the slit 6, the folded flange portion 5 bulges and deforms to the inside of the R bending, that is, to the inner wall surface 2b side. It does not end up, and at the same time, the so-called seagull breaking phenomenon does not occur.

Therefore, the battery box 1 of the present embodiment can be formed into a beautiful R shape even if the hemming bending portion 4 is provided at the corner portion 2a. Therefore, the battery box 1 can improve the safety in handling the product without finishing the edge 3 on the opening 1a side of the side wall 2.

It is preferable that the flange portion 5 of the hemming bending portion 4 is formed with a cut-up piece (not shown) that can be bent and erected by a finger. The cut-up piece is configured to be able to attach a lid or the like without using a fastening member such as a bolt by bending it with a finger and standing upright.

[Manufacturing process of bent products]
Next, a method of manufacturing the battery box 1 as a bent product will be described with reference to the flowchart of FIG.
First, the sheet metal material is punched by a turret punch press or the like, or cut by a laser to prepare a plate material (expanded body) in an unfolded state of the lid portion, the bottom portion and the side wall portion 2 of the battery box 1. As shown in 4 (a) and FIG. 5, as the first step, in the developed body of the side wall portion 2, the slit gap region 6s includes the bending start point Rs and the bending end point Re in the R bending region RA. , A plurality of slits 6 are formed in the flange portion 5 (step S100).

Specifically, in step S100, the slit 6 is formed as follows. That is, as shown in FIG. 5, in the slit 6, one side wall 6b in the R bending direction facing the slit gap region 6s is formed in a tapered shape inclined with respect to the other side wall 6a. More specifically, one side wall 6b is along a direction intersecting the R bending direction with respect to the other side wall 6a (that is, the direction of the R bending center Rc) and in the direction of the tip 5a of the flange portion 5. It is formed so as to spread toward. In this case, the other side wall 6a is formed so as to be parallel to the intersecting direction.

In this case, assuming that the width direction dimension of the innermost portion 6c of the slit 6 is D2 and the width direction dimension of the flange portion 5 of the slit 6 on the tip 5a side is D1, the dimensional relationship of D1> D2 is satisfied. It becomes. As described above, the slit 6 is formed so that the distance between one side wall 6a and the other side wall 6b is maximized by the dimension D1 on the tip 5a side of the flange portion 5. Further, the planar shape of the flange portion 5 sandwiched between the slits 6 is trapezoidal as shown in FIG. By forming the side walls 6a and 6b of the slit 6 in the flange portion 5 in this way, it is possible to more reliably prevent the occurrence of deformation due to the bending stress applied to the flange portion 5 during the R bending process in the R bending area RA. Is possible.

As shown in FIG. 6, the slit 6 has a tapered shape in which one side wall 6a in the R bending direction facing the slit gap region 6s is inclined with respect to the other side wall 6b, that is, one side wall 6a is formed. It may be formed so as to spread along the direction of the R bending center Rc with respect to the other side wall 6b and toward the tip 5a of the flange portion 5. In this case, the other side wall 6b is formed so as to be parallel to the direction of the R bending center Rc.

Even in this case, the width direction dimension of the innermost portion 6c of the slit 6 and the width direction dimension of the flange portion 5 of the slit 6 on the tip 5a side satisfy the dimensional relationship of D1> D2, and the flange sandwiched between the slits 6 The planar shape of the portion 5 is a quadrangular shape as shown in FIG. 6, but the same effect as that of the trapezoidal shape can be obtained. In addition, although not shown, the slit 6 is such that one side wall 6a and the other side wall 6b each expand along the direction of the R bending center Rc and toward the tip 5a of the flange portion 5. It may be formed, and even in this case, it is possible to exert the same action and effect as described above.

Further, as shown in FIG. 5, the slit 6 is located at a position where the innermost portion 6c of the slit is separated from the folding line 9 of the hemming bending portion 4 by a predetermined distance L in the direction of the tip 5a of the flange portion 5. Is formed to do. By forming the slit 6 away from the portion serving as the edge portion 3 inside the battery box 1 in this way, the slit 6 is not visible from the appearance of the side wall portion 2 when the R bending process is performed. That is, the structure can be made so as not to spoil the aesthetic appearance. Further, by forming the slit 6 away from the edge portion 3, it is possible to form a structure in which the slit 6 does not hang on the shoulder portion of the die for processing when the hemming bending process is performed. The structure is such that the hemming bending portion 4 is not easily deformed.

As an example, when the plate thickness of the side wall portion 2 constituting the battery box 1 is 1 mm and the bending R in the R bending region RA is 10 mm, the length of the flange portion 5 from the folding line 9 to the tip 5a is The length of the slit 6 in the same direction is set to 15 mm, the dimension D1 is 1.5 mm, the dimension D2 is 1.0 mm, and the distance L is 5 mm or more. In this case, if the concave width of the processing recess (V groove) of the die for hemming bending is 6 mm, the slit 6 does not hang on the shoulder of the die during hemming bending, so that the hemming portion 4 is deformed. You can avoid that.

Next, as a second step, as shown in FIG. 4B, in the developed body of the side wall portion 2, the flange portion 5 is folded back along the folding line 9 to form the hemming bending portion 4 (step S101). Then, as an R-bending process, R-bending is performed on the R-bending region RA of the developed body of the side wall 2 including the hemming-bending portion 4 (step S102), and the corner 2a is formed into an R shape. ..

In this step S102, as shown in FIGS. 7 to 9, first, the R bending R is pressed against the inner wall surface 2b of the developed body of the side wall portion 2 excluding the hemming bending processing portion 4 in the R bending processing region RA. A jig 11 for a plate thickness step having a portion bent according to the shape is attached to the punch P for R bending.

The plate thickness of the jig 11 is formed to be the same as the plate thickness of the developed body of the side wall portion 2, or more correctly, the plate thickness of the flange portion 5. Then, the developed body of the side wall portion 2 is placed on the die D for R bending so that the R bending region RA is pressed by the punch P, and the developed body of the side wall portion 2 is placed together with the jig 11 by the punch P. Pressing is performed for R bending. As shown in FIGS. 8 and 9, for example, the jig 11 is detachably attached to the punch P via a magnet 12. By performing the R-bending process using the jig 11 configured in this way, a member such as a waste plate, which has been conventionally used for absorbing a plate thickness step in the R-bending process, becomes unnecessary, so that the processing cost It is possible to reduce the cost.

Finally, the side wall portion 2 is formed by combining the developed bodies subjected to the R bending process, the bottom portion and the lid portion are attached, and a post-process including a welding process, a polishing process, and the like is performed (step S103), and the battery box 1 is performed. To manufacture. As described above, according to the manufacturing method of the battery box 1 according to the present embodiment, by using the jig 11, hemming without causing a so-called seagull breaking phenomenon while eliminating the need for a waste plate during the R bending process. The bent portion 4 can be provided at the corner portion 2a to form a beautiful R shape, and the handling safety can be improved without finishing the edge portion 3 on the opening 1a side of the side wall portion 2. Can be done.

[Composition of other bent products]
Next, a bent product according to another embodiment of the present invention will be described. The same or corresponding components as those already described are designated by the same reference numerals, and duplicate description will be omitted.
As shown in FIGS. 10 and 11, the bent product according to the present embodiment is manufactured as, for example, a handle portion 20 attached to the lid portion 30 of the battery box 1 described above. The handle portion 20 includes an arch-shaped handle main body 21 and insertion portions 29 provided at both ends thereof. The handle main body 21 is provided with a plurality of R bending regions (not shown) and a light bending region (not shown) in the vicinity of the insertion portion 29. The insertion portion 29 is inserted into the insertion hole 31 provided in the lid portion 30. The insertion portion 29 is formed with a wedge piece 29a that is hooked on the peripheral edge of the opening of the insertion hole 31. As a result, the handle portion 20 has a structure that does not come off after being attached to the lid portion 30.

The handle portion 20 is manufactured as follows, for example. First, as shown in FIG. 11A, by the punching process, cutting process, or the like described above, the insertion portions 29 are formed from the sheet metal material on both ends in the longitudinal direction, and the flange portions 5A and 5B as described above. And the slits 6 form a deployable body of the handle body 21 formed on both ends in the lateral direction. The flange portions 5A and 5B are formed so as to have substantially the same width as half the width in the lateral direction of the handle main body 21 when the flange portions 5A and 5B are folded back along the folding line 9 and subjected to the hemming bending process.

Next, as shown in FIG. 11 (b), in the developed body of the handle main body 21, for example, one flange portion 5A is folded back along the folding line 9 to perform hemming bending, and as shown in FIG. 11 (c). The other flange portion 5B is folded back along the folding line 9 and subjected to a hemming bending process to form the original shape of the handle body 21. At this time, hemming bending is performed so that the tip 5aa of the flange portion 5A and the tip 5ab of the flange portion 5B are in contact with each other.

Then, as shown in FIG. 11D, the original shape of the handle body 21 is subjected to a light bending process in a light bending region in the vicinity of the insertion portion 29, and is bent around the R bending center Rc. R-bending is performed on the R-bending region in order from both ends in the longitudinal direction, for example, to manufacture the handle portion 20 as shown in FIG. 11 (e).

In the handle portion 20 formed in this way, the handle portions 21 are formed so that the tips 5aa and 5bb of the flange portions 5A and 5B are in contact with each other, and in the slit 6 of the R bending region, one side wall 6a and The other side wall 6b (see FIG. 11C and the like) is deformed so as to be substantially fitted so as to eliminate the slit gap region 6s. Therefore, the handle body 21 after molding is very soft to the touch of the fingertips, has very high strength, and is not easily deformed. Further, a smooth-touch edge portion 3 is formed at a portion corresponding to the outside of the folded line 9 of each of the flange portions 5A and 5B. Therefore, according to the handle portion 20 of the present embodiment, the handle main body 21 is subjected to hemming bending processing and R bending processing without finishing processing to provide a handle portion that can be safely gripped in a beautiful R shape. Is possible.

Although some embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

For example, in the above embodiment, the slits 6 formed in the flange portion 5 and the like are the slit gap regions 6s of the slit 6 before the R bending, where the bending start point Rs and the bending end point Re of the R bending region RA are respectively. Although it was formed so as to be included in (see FIG. 5 and the like), the present invention is not limited to this, and the slits of the slit 6 before the R bending process are the locations where the bending start point Rs and the bending end point Re of the R bending processing region RA are respectively. Near the gap region 6s, for example, a position closer to the R bending center Rc than the side wall 6b of the slit 6 (near the slit inner edge side) or a position farther from the R bending center Rc than the side wall 6a of the slit 6 (on the slit outer edge side). It may be formed so as to be located in the vicinity). In this case, the “neighborhood” refers to a neighborhood region within a range in which deformation of the flange portion 5 and occurrence of a so-called seagull bending phenomenon during R-bending are suppressed, and for example, from the end portion of the slit gap region 6s. It means the area within 5 mm.
Further, the slit 6 may be formed in other places within the range of the R bending region RA. However, from the viewpoint of preventing excessive deformation due to bending stress during R-bending, the slit 6 does not include the portion of the R-bending center Rc of the R-bending region RA in the slit void region 6s before R-bending. It should be formed in.

1 Battery box 1a Opening 2 Side wall 2a Corner 2b Inner wall surface 3 Edge 4 Hemming bending part 5,5A, 5B Flange part 5a, 5aa, 5ab Tip 6 Slit 6a, 6b Side wall 6c Deepest 6s Slit gap area 9 Folded line (hemming bending line)
11 Jig 12 Magnet 20 Handle part 21 Handle body 29 Insertion part

Claims (9)

It is a bent product in which the hemming bending part formed by folding back the flange part is R-bent.
The flange portion has a plurality of slits formed so that at least the bending start point and the bending end point in the R bending processing region are included in or in the vicinity of the slit gap region before the R bending processing. Bent processed product characterized by. The bending according to claim 1, wherein one of the side walls in the R bending direction facing the slit gap region is formed in a tapered shape inclined with respect to the other side wall. Processed goods. The bent product according to claim 2, wherein the slit is formed so that the distance between the one side wall and the other side wall is maximized on the tip end side of the flange portion. The slits of claims 1 to 3 are characterized in that the innermost portion of the slit is formed so as to be located at a position separated from the turn-back line of the hemming bending portion in the direction of the tip end of the flange portion. The bent product according to any one item. It is a manufacturing method of a bent product in which the hemming bent portion formed by folding back the flange portion is subjected to R bending.
The first step of forming a plurality of slits in the flange portion of the work material, and
A second step of folding the flange portion along a folding line to form the hemming bending portion on the work piece, and
It is provided with an R bending process for forming an R bending region of the work material including the hemming bending portion into an R shape.
In the first step, the plurality of slits are formed so that at least the bending start point and the bending end point in the R bending region are included in or near the slit gap region before the R bending. A method for manufacturing a bent product, which is characterized in that. The first step is characterized in that the slit is formed so that one side wall in the R bending direction facing the slit gap region has a tapered shape that is inclined with respect to the other side wall. The method for manufacturing a bent product according to claim 5. The first step according to claim 5 or 6, wherein the slit is formed so that the innermost portion of the slit is located at a position farther from the turn-back line in the tip direction of the flange portion. Manufacturing method of bent products. In the R bending step, a jig having a portion bent according to the R shape of the R bending so as to be pressed against the work material excluding the hemming bending portion is attached to the punch for the R bending process. The method for manufacturing a bent product according to any one of claims 5 to 7, wherein the R bending process is performed. The method for manufacturing a bent product according to claim 8, wherein the jig is detachably attached to the punch via a magnet.

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