JP2018114527A - Bending method and bending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending method by which a substrate and a reinforcement plate can be simultaneously molded.SOLUTION: A bending method for molding a part or the whole of a work-piece into a bent shape in such a manner that press bending of plural times is performed for the work-piece while shifting a position at which a long punch die is pressed onto the work-piece. The work-piece includes a substrate, and a reinforcement plate which is so joined to the substrate as to cover a part of the substrate, the punch die are divided into plural split dies which are arranged in a longer direction of said punch die, and each of the plural split dies is so configured that a position thereof in a pressing direction of the punch die can be adjusted. Positions of the plural split dies are adjusted so that at least one split die of the plural split dies contacts the substrate, and at least one other split die contacts the reinforcement plate, and in this state, the punch die is pressed onto the work-piece.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bending method for forming a part or the whole of a plate-like workpiece into a curved shape, and a bending device that can be suitably used for the bending method.

  2. Description of the Related Art Conventionally, a bending method of forming a part or the whole of a plate-like workpiece into a curved shape using a bending device (for example, a press brake device) including a female die having a V groove and a long punch die. Is known (see, for example, Patent Document 1). Specifically, in this bending method, press bending (air bend) is performed a plurality of times on the workpiece while shifting the position at which the punch die is pressed against the workpiece.

  For example, in a side structure of a railway vehicle, a part of the outer plate may be designed to have a relatively large radius of curvature. In such a case, the outer plate is subjected to multiple press bendings.

JP 2009-90293 A

  By the way, in a side structure of a railway vehicle, the outer plate may be partially reinforced by a reinforcing plate. In such a configuration, as described above, a part of the outer plate is first formed into a relatively large curvature by a plurality of press bendings. Thereafter, the reinforcing plate formed in a shape along the outer plate is joined to the outer plate by spot welding or the like.

  However, in such a method for manufacturing a side structure, a lot of labor is required to form the outer plate and the reinforcing plate separately.

  Then, an object of this invention is to provide the bending method which can be used suitably for the bending method which can shape | mold a board | substrate and a reinforcement board simultaneously, and the bending method.

  In order to solve the above-described problem, the bending method of the present invention performs a plurality of press bendings on the workpiece while shifting the position at which the long punch die is pressed against the workpiece, so that a part or the whole of the workpiece is obtained. A bending method for forming a curved shape, wherein the workpiece includes a substrate and a reinforcing plate bonded to the substrate so as to cover a part of the substrate, and the punch die is a longitudinal length of the punch die. Each of the plurality of divided molds is configured such that a position in the pressing direction of the punch mold is adjustable, and at least one of the plurality of divided molds is arranged. The positions of the plurality of split molds are adjusted so that the split mold comes into contact with the substrate and at least one other split mold comes into contact with the reinforcing plate. Pressing the mold, characterized in that.

  According to said structure, since a split type | mold contacts both a board | substrate and a reinforcement board, a board | substrate and a reinforcement board can be shape | molded simultaneously.

  The thickness of the reinforcing plate is the same as the thickness of the substrate, and in the pressing direction of the punch die, the at least one split die that contacts the substrate and the at least one split die that contacts the reinforcing plate The positions of the plurality of split molds may be adjusted so that the distance between the two is the same as the thickness of the reinforcing plate. When press bending is performed on a workpiece that has a thin-walled portion and a thick-walled portion integrally, in order to bend the workpiece uniformly, the thin-walled portion is It is necessary to press with a stroke larger than the part. On the other hand, when press bending is performed on a workpiece in which a reinforcing plate having the same thickness as the substrate is bonded to the substrate, in order to bend the workpiece uniformly, the substrate and the reinforcing plate must be pressed with the same stroke. Good. Therefore, when the thickness of the reinforcing plate is the same as the thickness of the substrate, the substrate and the reinforcing plate can be pressed with the same stroke if the distance between the split molds contacting them is the same as the thickness of the reinforcing plate. At the same time, the position of the split type can be easily adjusted.

  Prior work equipment is attached to the workpiece, and among the plurality of divided molds, the divided molds at positions corresponding to the preceding equipment are not in contact with the preceding equipment. The position may be adjusted. According to this configuration, since the preceding outfitting is attached to the workpiece in a flat state before being formed into a curved shape, the outfitting work can be easily performed.

  The bending apparatus of the present invention is a bending apparatus that performs press bending on a workpiece having a reinforcing plate bonded to the substrate so as to cover a part of the substrate, and is a female mold that supports the workpiece. A female die having a pair of reaction force parts spaced apart by a groove, and a long punch die pressed against the workpiece between the pair of reaction force parts, in the longitudinal direction of the punch die A punch die divided into a plurality of divided dies, and a plurality of electric actuators respectively corresponding to the plurality of divided dies, each of which is capable of adjusting the position of the divided die in the pressing direction of the punch die The electric actuator and the plurality of electric actuators so that at least one of the plurality of divided molds contacts the substrate, and at least one other divided mold contacts the reinforcing plate. By controlling the over data and a control device for adjusting the position of the plurality of split mold, characterized in that. Such a bending apparatus can be suitably used for the above bending method. In addition, the position of the split mold can be adjusted accurately and quickly by the electric actuator.

  The thickness of the reinforcing plate is the same as the thickness of the substrate, and the control device, in the pressing direction of the punch die, the at least one split mold that contacts the substrate, and the contact that contacts the reinforcing plate. The positions of the plurality of split molds may be adjusted by controlling the plurality of electric actuators so that the distance between the at least one split mold is the same as the thickness of the reinforcing plate. According to this configuration, the substrate and the reinforcing plate can be pressed with the same stroke, and the position of the split mold can be easily adjusted.

  For example, each of the plurality of electric actuators may include a screw shaft that is screwed into a screw hole formed in the split mold, and a motor that rotates the screw shaft.

  The bending apparatus may further include a backup plate placed on the pair of reaction force parts so as to close the groove. According to this configuration, the press bending can be performed on the workpiece even at a position close to the end of the workpiece.

  According to the present invention, the substrate and the reinforcing plate can be simultaneously formed.

It is a perspective view of the bending apparatus used for the bending method which concerns on one Embodiment of this invention. It is a front sectional view of a part of the bending apparatus shown in FIG. It is side surface sectional drawing of a part of bending apparatus shown in FIG. 1 which illustrates the state before performing the first press bending. FIG. 2 is a side sectional view of a part of the bending apparatus shown in FIG. 1 illustrating a state in the middle of performing the first press bending. It is side surface sectional drawing of a part of bending apparatus shown in FIG. 1 which illustrates the state after performing the first press bending. FIG. 2 is a side cross-sectional view of a part of the bending apparatus shown in FIG. 1, illustrating a state after a plurality of press bendings. It is a perspective view of the workpiece | work to which the preceding rigging was attached.

  FIG. 1 shows a bending apparatus 2 used in a bending method according to an embodiment of the present invention. The bending apparatus 2 performs press bending on the workpiece 1.

  The workpiece 1 includes a relatively large substrate 11 and at least one reinforcing plate 12 joined to the substrate 11 so as to cover a part of the substrate 11. In the present embodiment, there are a plurality of reinforcing plates 12. A method for joining the reinforcing plate 12 to the substrate 11 is not particularly limited, and for example, spot welding, riveting, intermittent or continuous fillet welding, and the like.

  In the present embodiment, the workpiece 1 is a part of a side structure of a railway vehicle, and the substrate 11 is a rectangular outer plate extending in the vehicle longitudinal direction. For this reason, the substrate 11 has a plurality of window openings 13 and door openings 14 arranged in the longitudinal direction of the vehicle. The reinforcing plate 12 is disposed between the openings 13 and 14. Each reinforcing plate 11 is a belt-like plate extending in the vehicle height direction.

  However, the work 1 does not necessarily have to be a part of the side structure of the railway vehicle, and may be a part of the roof structure of the railway vehicle. Alternatively, the workpiece 1 is a part of a streamlined leading vehicle of a railway vehicle, and may be processed into a conical shape or other complicated shape by press bending. Furthermore, the workpiece 1 may be, for example, a part of a ship hull or a part of a housing of a construction machine.

  In the example shown in FIG. 1, the reinforcing plate 12 is joined only to one surface (the inner surface of the outer plate) of the base material 11, but the reinforcing plate 12 is the other surface (the outer surface of the outer plate). ) May also be joined. For example, a frame-shaped reinforcing plate 12 that borders the door opening 14 may be joined to the outer surface of the outer plate that is the base material 11.

  In addition, a preceding fitting may be attached to the work 1. If it is this structure, since a prior | preceding outfitting is attached to the workpiece | work 1 of the flat state before shape | molding in the curved shape, outfitting work can be performed easily.

  When the workpiece 1 is a part of a side structure of a railway vehicle as in the present embodiment, the preceding fitting is, for example, a plurality of bone members having a hat-shaped cross section that extend in the vehicle longitudinal direction and / or the vehicle height direction. There may be. Alternatively, as shown in FIG. 7, the preceding outfitting may be a member 15 having a limited surface pressure, such as a metal fitting 15 provided with a screw hole, a mounting plate of various devices, or a design seal. Furthermore, the preceding outfitting may be a stud bolt, a nut, various brackets, an electric wiring material, or the like.

  Returning to FIG. 1, the bending apparatus 2 includes a female die 3 that supports the workpiece 1, and a punch die 4 disposed above the female die 3. The female die 3 and the punch die 4 are long extending in a specific direction. In the present embodiment, the workpiece 1 is set between the female die 3 and the punch die 4 so that the longitudinal direction of the workpiece 1 (vehicle longitudinal direction) matches the longitudinal direction of the female die 3 and the punch die 4.

  Further, a fixed frame 21 having the same length as that of the female die 3 is disposed above the punch die 4. Both ends of the fixed frame 21 are connected to both ends of the female mold 3 by a plurality of rods 22.

  The punch die 4 described above is held by the movable frame 24. The movable frame 24 has the same shape as the fixed frame 21 in plan view, and is supported by the rod 22 so as to be slidable in the vertical direction. A plurality (three in the illustrated example) of hydraulic cylinders 23 are provided between the movable frame 24 and the fixed frame 21. The hydraulic cylinder 23 presses the punch die 4 against the workpiece 1 via the movable frame 24 or separates it from the workpiece 1.

  As shown in FIG. 3, the female die 3 has a pair of reaction force portions 31 that are spaced apart by a groove 32 extending in the longitudinal direction of the female die 3. The punch die 4 described above is pressed against the workpiece 1 between these reaction force portions 31. The backup plate 5 is placed on the pair of reaction force portions 31 so as to close the grooves 32. The backup plate 5 supports the workpiece 1 between the reaction force portions 31. The backup plate 5 is preferably configured so as not to be plastically deformed when pressed against the punch die 4 via the workpiece 1.

  As shown in FIGS. 1 and 2, the punch die 4 is divided into a plurality of divided dies 41 arranged in the longitudinal direction of the punch die 4. The downward tip surface of each split mold 41 is not sharply pointed but has a relatively large radius of curvature as shown in FIG. The movable frame 24 described above is hollow, and a plurality of electric actuators 6 respectively corresponding to the split mold 41 are arranged in the movable frame 24.

  Each electric actuator 6 can adjust the position of the split die 41 in the pressing direction of the punch die 4 (in this embodiment, the vertical direction). In the present embodiment, each electric actuator 6 includes a screw shaft 62 that is screwed into a screw hole (not shown) formed in the split mold 41 and a motor 61 that rotates the screw shaft 62.

  All the electric actuators 6 (more precisely, the motor 61) are controlled by the control device 7 so that the position of each divided mold 41 is adjusted to a position corresponding to the shape of the workpiece 1. More specifically, the control device 7 includes a plurality of split molds 41 such that at least one split mold 41 contacts the substrate 11 and at least one other split mold 41 contacts the reinforcing plate 12. The electric actuator 6 is controlled to adjust the positions of the plurality of split dies 41.

  For example, at least one split mold 41 in contact with the substrate 11 is all the split molds 41 facing the substrate 11 in the vertical direction, and at least one split mold 41 in contact with the reinforcing plate 12 is a reinforcing plate in the vertical direction. 12 and all the divided molds 41 facing each other. And the control apparatus 4 controls the electric actuator 6 corresponding to the division | segmentation type | mold 41 which contacts the board | substrate 11 and the reinforcement board 12, and lowers those division | segmentation type | molds 41 only the predetermined amount from the initial position located in the uppermost part. On the other hand, the control device 41 does not operate the electric actuators 6 corresponding to the divided molds 41 with respect to the divided molds 41 located outside the workpiece 1, and maintains the divided molds 41 at the initial positions. . Further, the split mold 41 located immediately above the door opening 14 is also maintained at the initial position.

  When the preceding equipment is attached to the workpiece 1, the positions of the plurality of divided molds 41 are set so that the divided mold 41 in the position corresponding to the preceding equipment among the plurality of divided molds 41 does not contact the preceding equipment. Adjusted. For example, the split mold 41 at the position corresponding to the preceding outfitting is maintained at the initial position.

  In the present embodiment, the thickness T2 of the reinforcing plate 12 is the same as the thickness T1 of the substrate 11. Therefore, in the pressing direction of the punch die 4, the distance D between the at least one split die 41 that contacts the substrate 11 and the at least one split die 41 that contacts the reinforcing plate 12 is the thickness of the reinforcing plate 12. The positions of the plurality of split molds 41 are adjusted so as to be the same as T2. However, the thickness T2 of the reinforcing plate 12 may be different from the thickness T1 of the substrate 11.

  The bending method of the present embodiment using such a bending apparatus 2 performs one-time press bending on the work 1 while shifting the position at which the punch die 4 is pressed against the work 1, and Part or the whole is formed into a curved shape. In each press bending, as described above, the position of each split mold 41 is adjusted by the electric actuator 6 according to the shape of the work 1, and the punch mold 4 is pressed against the work 1 in this state.

  For example, in the first press bending, the punch die 4 is lowered and raised as shown in FIGS. 3 to 5, whereby the workpiece 1 is slightly curved. By performing such press bending a plurality of times, the workpiece 1 can be greatly curved as shown in FIG.

  As described above, in the bending method of the present embodiment, the split mold 41 is in contact with both the substrate 11 and the reinforcing plate 12, and therefore the substrate 11 and the reinforcing plate 12 can be formed simultaneously. Moreover, if it is the bending apparatus 2 of a structure as mentioned above, it can be used conveniently for the bending method of this embodiment. In addition, the position of the split mold 41 can be adjusted accurately and quickly by the electric actuator 6. Furthermore, since the bending apparatus 2 includes the backup plate 5, it is possible to perform press bending on the work 1 even at a position close to the end of the work 1.

  By the way, when performing press bending on a work integrally having a thin part and a thick part, in order to bend the work uniformly, due to the difference in formability between the thin part and the thick part, It is necessary to press with a stroke larger than the thick part. On the other hand, when press bending is performed on the workpiece 1 in which the reinforcing plate 12 having the same thickness as the substrate 11 is bonded to the substrate 11, the substrate 11, the reinforcing plate 12, Can be pressed with the same stroke. Here, the “stroke” at the time of pressing refers to the amount of movement of the punch die 4 after the split die 41 comes into contact with the substrate 11 or the reinforcing plate 12. Therefore, when the thickness D2 of the reinforcing plate 12 is the same as the thickness T1 of the substrate 11 and the distance D between the split dies 41 contacting them is the same as the thickness T2 of the reinforcing plate 12, The reinforcing plate 12 can be pressed with the same stroke, and the position of the split mold can be easily adjusted.

(Modification)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, in the bending method of the present invention, unlike the bending device 2 including a plurality of electric actuators 6, a bending device capable of manually adjusting the position of each divided die 41 in the pressing direction of the punch die 4 is used. May be.

1 Workpiece 11 Thick plate part 12 Thin plate part 15 Metal fitting (advanced equipment)
16 Mounting plate (advanced equipment)
DESCRIPTION OF SYMBOLS 2 Bending apparatus 3 Female type 31 Reaction force part 32 Groove 4 Punch type 41 Split type 6 Electric actuator 61 Motor 62 Screw shaft 7 Control apparatus

Claims (7)

A bending method of forming a part or the whole of the workpiece into a curved shape by performing a plurality of press bendings on the workpiece while shifting the position at which the long punch die is pressed against the workpiece,
The workpiece includes a substrate and a reinforcing plate bonded to the substrate so as to cover a part of the substrate,
The punch mold is divided into a plurality of divided molds arranged in the longitudinal direction of the punch mold, and each of the plurality of divided molds is configured such that the position in the pressing direction of the punch mold is adjustable.
Adjusting the positions of the plurality of split molds such that at least one split mold contacts the substrate and at least one other split mold contacts the reinforcing plate among the plurality of split molds; A bending method in which the punch die is pressed against the workpiece in a state. The thickness of the reinforcing plate is the same as the thickness of the substrate,
The distance between the at least one split mold that contacts the substrate and the at least one split mold that contacts the reinforcing plate in the pressing direction of the punch mold is the same as the thickness of the reinforcing plate. The bending method according to claim 1, wherein the positions of the plurality of divided dies are adjusted. Prior work equipment is attached to the workpiece,
The bending according to claim 1 or 2, wherein a position of the plurality of split molds is adjusted so that a split mold at a position corresponding to the preceding outfit among the plurality of split molds does not contact the preceding outfit. Processing method. A bending apparatus that performs press bending on a workpiece in which a reinforcing plate is bonded to the substrate so as to cover a part of the substrate,
A female mold for supporting the workpiece, the female mold having a pair of reaction force portions spaced apart from each other with a groove interposed therebetween;
A long punch die pressed against the workpiece between the pair of reaction force parts, the punch die divided into a plurality of split dies arranged in the longitudinal direction of the punch die; and
A plurality of electric actuators respectively corresponding to the plurality of divided molds, each of which is capable of adjusting the position of the divided mold in the pressing direction of the punch mold;
Among the plurality of split molds, the plurality of electric actuators are controlled so that at least one split mold contacts the substrate and at least one other split mold contacts the reinforcing plate. A control device for adjusting the position of the split type;
A bending apparatus comprising: The thickness of the reinforcing plate is the same as the thickness of the substrate,
In the pressing direction of the punch mold, the control device is configured such that a distance between the at least one split mold that contacts the substrate and the at least one split mold that contacts the reinforcing plate is a thickness of the reinforcing plate. 5. The bending apparatus according to claim 4, wherein the plurality of electric actuators are controlled to adjust the positions of the plurality of split molds so as to be the same.   6. The bending apparatus according to claim 4, wherein each of the plurality of electric actuators includes a screw shaft that is screwed into a screw hole formed in the split mold, and a motor that rotates the screw shaft. The bending apparatus according to any one of claims 4 to 6, further comprising a backup plate placed on the pair of reaction force portions so as to close the groove.

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