JPH0733416U - Bending device for hollow sections - Google Patents

Abstract

(57) [Summary] [Purpose] Even when performing bending with a hollow shape having different lengths or different bending radii, it is possible to respond by simply replacing the bending die or changing its mounting position. (EN) Provided is a device for bending a hollow shape member, which can reduce the number of work steps and perform bending work efficiently. [Structure] A fixing mechanism for fixing the hollow shape member attached to the bending die, and by moving in the bending direction from the start end to the end of the bending of the bending die while pressing the hollow shape member,
A bending mechanism consisting of a pressing part that bends the hollow mold and an upper mold positioning part that gives a moving force in the bending direction to this pressing part, and the pressing part is hollow when the core is inserted into the hollow inside of the hollow profile. When pressing the shape member and moving it in the bending direction of the bending die, for sequentially positioning the core inside the hollow inside of the hollow shape member facing the pressing position of the pressing portion and changing its direction in the tangential direction of the bending die. And a core support mechanism.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for bending a hollow material, and more particularly to a device for bending a hollow material for bending both ends of a material such as a bumper for an automobile.

[0002]

[Prior art]

 FIG. 4 and FIG. 5 are views showing a bending apparatus and a processing method of a hollow material for bending a hollow material in a conventional example. In the drawing, a bending apparatus 20 for a hollow shape member according to this conventional example shows a bending die 2 attached to a base (not particularly shown) and a hollow shape member as a product material attached to the bending die 2. It is roughly composed of a fixing mechanism A for fixing 3 and a bending mechanism D for applying a pressing force to the hollow profile 3 for bending. Of these, the fixing mechanism A is connected to a holding portion 4a for holding and fixing the hollow shape member 3 in the bending die 2 and the holding portion 4a via a rod 4b, and applies a holding pressure to the holding portion 4a. It is composed of a holding cylinder 4c which is operated by hydraulic pressure for holding the holding cylinder 4c, and a holding cylinder mounting base 5 for fixing the holding cylinder 4c.

Further, the bending mechanism D applies an upper die 21a for performing bending work by pressing the hollow shape member 3 along the radius of the bending die 2 and a pressing force to the upper die 21a. A bending cylinder 21c, which is connected to the bending mechanism via a rod 21b, is fixed to a mounting base 22 of the bending mechanism. This bending cylinder 21c also operates by hydraulic pressure. In addition, a core 23a, which is connected to a core slide cylinder 23c operated by hydraulic pressure via a rod 23b, is attached to a mounting base 22 of the bending mechanism in a hollow shape facing the pressing position of the upper mold 21a. It is arranged so as to be located inside the hollow of the material 3. That is, the core 23a is for preventing the hollow portion of the hollow shape member 3 from being deformed unnecessarily at the time of bending, so that the bending can be performed while maintaining a clean hollow state. is there.

The mounting base 22 of this bending mechanism is rotatably supported by a support shaft 24 below a bending die 2 on a base (not shown). The mounting position of the support shaft 24, that is, the shaft supporting position serving as the center of rotation is set and adjusted each time according to the curvature of the bending die 2 used and the mounting position thereof. The mounting base 22 of the bending mechanism is further connected to a drive cylinder 26c rotatably supported by a support shaft 25 on a base (not shown) via a support shaft 26a via a rod 26b.

In such a structure, as shown in FIG. 4, a hollow cylinder 3 to be processed, which is abutted on the bending mold 2, is driven by a pressing cylinder 4c at the pressing portion 4a. 3 is clamped and fixed to the bending die 2. The core 23a is positioned in the hollow inside of the hollow frame 3 opposite to the position where the upper mold 21a abuts the hollow frame 3 as described above by the operation of the core slide cylinder 23c. In this state, when the drive cylinder 26c is driven and the rod 26b is retracted, the mounting base 22 of the bending mechanism rotates leftward in the drawing about the support shaft 24 as shown in FIG. Thus, the upper die 21a slides while pressing the hollow shape member 3 along the radius of the bending die 2 to perform bending.

[0006]

[Problems to be solved by the device]

 In such a conventional apparatus for bending a hollow shape member, when bending an automobile bumper, for example, in many cases, both ends of the hollow shape member are processed at the same time. In this case, as shown in FIG. The bending device shown in FIG. 5 is also arranged symmetrically on the right side of the drawing so that machining can be efficiently performed in one stroke. However, in this way, in the simultaneous processing of both ends of the hollow shape member, when the hollow shape members 3 having different lengths are processed or when a new bending mold having a different curvature of the bending mold 2 is used, the bending mold 2 It is not possible to deal with this by simply changing the mounting position of the bending die 2. The mounting position of the mounting base 22 of the bending mechanism that constitutes the main part of the device, that is, the mounting position of the support shaft 24 as the rotation center shaft. Need to be changed each time, and in particular, setting and adjustment of the rotation center axis is a laborious and extremely difficult work. The present invention has been made in view of such a problem, and even when performing bending work in which the length of the hollow shape member is different and the curvature of the bending die is different, simply replace the bending die, Alternatively, it suffices to change the mounting position of the hollow shape member, which does not require troublesome adjustment of the rotation center axis, etc. Therefore, the number of man-hours is reduced and bending work can be performed efficiently. The purpose is to provide a bending device.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a hollow profile bending device 1, 1 ′ that performs bending by pressing an end of a hollow profile 3 having a core 11 a inserted into a bending mold 2. The fixing mechanism A for fixing the hollow shape member 3 attached to the bending die 2 and the hollow shape member 3 fixed by the fixing mechanism A are pressed with a predetermined pressing force. The pressing parts 6 and 16 for bending the hollow mold material 3 by moving in the bending direction from the beginning to the end of the bending of the bending die 2 and the upper part for moving the pressing parts 6 and 16 in the bending direction. Bending mechanisms B and B'having mold positioning parts 7 and 17, and the core 11a are inserted into the hollow inside of the hollow profile 3, and the pressing parts 6 and 16 press the hollow profile 3 to bend it. When moving in the bending direction of the mold 2, the pressing positions of the pressing portions 6 and 16 are A core support mechanism C for sequentially locating the core 11a inside the hollow of the corresponding hollow profile 3 and changing its direction in a substantially tangential direction of the bending die 2 is provided, and the bending die 2 and the pressing portion 6 are provided. , 16 and the core support mechanism C are arranged on separate mounting bases.

In the bending mechanism B, a rotatable upper die 6a is attached to the tip of the rod 6b at one end as the pressing portion 6, and the other end is rotatably supported by a mounting base 8 of the bending mechanism. The bending cylinder 6c and the rod 7b at one end of the upper die positioning portion 7 are rotatably supported by the pressing portions 6 and 16, and the other end is rotated to the mounting base 8 of the bending mechanism. This is a device for bending a hollow material, which comprises a first auxiliary cylinder 7c rotatably supported.

In the bending mechanism B ′, a rotatable upper mold 16a is attached to the tip of the rod 16b as the pressing portion 16 on the pressing portion mounting base 15 that moves in parallel by the guide rails 14a and 14b. The bending cylinder 16c is fixed, and the first auxiliary cylinder 17c, whose tip portion of the rod 17b is connected to the pressing portion mounting base 15 as the upper die positioning portion 17, is fixed to the first auxiliary cylinder mounting base 18. It is a thing.

Further, the core support mechanism C is arranged so that when the pressing portions 6 and 16 press the hollow frame 3 and move in the bending direction of the bending mold 2, the pressing portions 6 and 16 are moved to the pressing positions of the pressing portions 6 and 16. A core slide cylinder 11c having a rod 11b on which the core 11a is disposed at the tip end thereof in order to sequentially position the core 11a inside the hollow hollow of the facing hollow frame 3, and the pressing parts 6, 16 described above. The core slide cylinder is rotated in order to sequentially change the direction of the core 11a in the substantially tangential direction of the bending die 2 when the hollow shape member 3 is pressed and moved in the bending direction of the bending die 2. A core slide cylinder mounting base 10 that freely supports the shaft, and a second auxiliary for sliding the core slide cylinder mounting base on the guide rails 9a and 9b to sequentially move the core slide cylinder mounting base in the bending direction of the hollow frame 3. Siri And a pressing device 6 and 16 for bending the hollow profile 3 by pressing the hollow profile 3 in the form of a roller. It is used as a bending device for a shape member.

[0011]

[Work]

 The core supported by the core support mechanism is inserted into the hollow inside of the hollow shape member, and the end of the hollow shape member to be processed is attached to the bending die and fixed by the fixing mechanism. The pressing portion of the bending mechanism is brought into contact with the fixed hollow shape member and pressed with a predetermined pressing force for bending. The pressing portion in the state of pressing the hollow shape member is moved while sliding in the bending direction of the bending die by the upper die positioning portion of the bending mechanism. Simultaneously with the movement operation of the pressing portion, the core support mechanism is activated, whereby the core is sequentially moved to the hollow inside position of the hollow shape member corresponding to the moving position of the pressing portion, and the bending die is substantially tangential direction. Change its direction to. Such operation of the device reaches the end of the hollow profile, and the bending process is completed.

In this case, since the bending die, the pressing portion, and the core support mechanism are provided on separate mounting bases, it is possible to process hollow profiles having different lengths or bending dies having different curvatures. Even when using it, it is only necessary to replace the bending mold or change its mounting position. Further, the upper die that abuts against and presses the hollow shape member is rotatable, and smoothly rolls and presses on the hollow shape member to perform bending work.

[0013]

【Example】

 A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a device for bending a hollow shape member according to the present invention, and FIG. 2 is a diagram showing the operation of each part of the device during bending. These figures show only the device located at the left end of the drawing from the center. Although devices similar to the device installed at the left end are also installed at the right end in reverse positions, only the device installed at the left end in the drawings will be described below, and the device installed at the right end will be described. The description of the installed device is omitted. When the machine is in operation, both ends of the hollow profile in the longitudinal direction are processed simultaneously.

In the drawing, a bending device 1 for this hollow shape member is a bending die 2 attached to a base (not particularly shown) and a product material attached to the bending die 2 to be processed. Of the fixing mechanism A for fixing the hollow shape member 3, a pressing unit 6 for pressing the hollow shape member 3 for bending, and a bending mechanism B and a core including an upper mold positioning unit 7 described later. The core support mechanism C for moving the position is roughly configured. The fixing mechanism A, the bending mechanism B, and the core support mechanism C are attached to the base portion by independent attachment bases as described later.

First, the fixing mechanism A has the same structure as the fixing mechanism in the conventional example shown in FIGS. 4 and 5, and includes a holding portion 4 a for pinching and fixing the hollow shape member 3 in the bending die 2. A pressing cylinder 4c which is connected to the pressing portion 4a through a rod 4b and operates by hydraulic pressure for applying a clamping force to the pressing portion 4a, and a pressing cylinder mounting base for fixing the pressing cylinder 4c. It is composed of 5.

The bending mechanism B includes the pressing portion 6 including an upper die 6a and a bending cylinder 6c connected to the upper die 6a via a rod 6b, and is connected to the pressing portion 6 via a rod 7b. The upper die positioning portion 7 has a first auxiliary cylinder 7c.

Of these, the upper die 6a of the pressing portion 6 is in the form of a roller that is rotatably supported by a spindle 6d at the tip of the rod 6b in this embodiment. Further, the bending cylinder 6c, which is operated by hydraulic pressure and applies a pressing force to the upper die 6a, is rotatably supported at its upper portion by a support shaft 6e on a mounting base 8 of the bending mechanism. ing.

The upper die positioning portion 7 is also arranged on the mounting base 8, and the first auxiliary cylinder 7c which is rotated by the support shaft 7d and which is actuated by hydraulic pressure is moved by the bending through the rod 7b. It is rotatably connected to the processing cylinder 6c by a support shaft 7a at the lower end thereof. In this case, the first auxiliary cylinder 7c operates and the rod 7b retracts in a state in which the bending cylinder 6c is operated and the required pressing force for bending is applied to the upper die 6a. As a result, the bending cylinder 6c is pulled to the left in the drawing, whereby the upper die 6a moves in the bending direction of the bending die 2 while pressing the hollow shape member 3 to bend the hollow shape member 3. Will be done.

Further, while bending the hollow shape member 3, while bending the hollow shape member 3 along the bending die 2 to a certain extent or more, it is added to the movable presser upper die 6a in the left direction in the figure. The component force is received by the first auxiliary cylinder 7c. Although the tip of the rod 7b of the first auxiliary cylinder 7c is pivotally supported on the lower end of the bending cylinder 6c in the above description, it may be added to the upper die 6a depending on the material and shape of the work material or the shape of the bending die 2. When the component force in the left direction increases, excessive bending stress in the left direction in the figure is applied to the rod 6b. Therefore, in this case, the tip of the rod 7b of the first auxiliary cylinder 7c is pivotally supported by the upper die support shaft 6d.

The core support mechanism C supports a core slide cylinder mounting base 10 which is vertically movable by a pair of guide rails 9a and 9b, and a core slide cylinder 11c which is operated by hydraulic pressure. The shaft 11d is rotatably attached, and the core slide cylinder 11c is provided with a core 11a via a rod 11b. Further, the core slide cylinder mounting base 10 is adapted to move up and down along the guide rails 9a, 9b by a second auxiliary cylinder 12c which is hydraulically operated via a rod 12b. That is, as shown in FIG. 2, the bending mechanism B is actuated, the hollow shape member 3 attached to the bending die 2 is pressed, and the tip end thereof moves in the bending direction of the bending die 2 (downward in the drawing). The second auxiliary cylinder 12c also operates in synchronization with the change of the position to move the mounting base 10 of the core slide cylinder 11c downward. As a result, the position of the core 11a disposed inside the hollow of the hollow shape member 3 is changed in the substantially tangential direction of the bending die 2. 13 is a second auxiliary cylinder mounting base. As described above, such a bending apparatus 1 for a hollow shape member is disposed at the right and left opposite positions even at the right end portion (not shown), and at the time of operation of the apparatus, it is provided at both ends in the longitudinal direction of the hollow shape member 3. The bending process will be performed simultaneously.

The operation of the hollow shape bending apparatus 1 configured as described above will be described with reference to FIGS. 1 and 2. First, the hollow profile 3 to be processed is aligned with and attached to the bending die 2, and the holding cylinder 4c of the fixing mechanism A is operated to pinch and fix the holding die 4a to the bending die 2. A pressure adjusting device (not shown) is provided in the pressing cylinder 4c, and the hollow shape member 3 is always fixed with a constant clamping force by the operation of the pressure adjusting device.

Then, the bending cylinder 6c of the bending mechanism B is operated to bring the upper mold 6a into contact with the hollow shape member 3 and press it with a predetermined pressure. Prior to this pressing, the core slide cylinder 11c is moved. The core 11a which is operated and attached to the tip of the rod 11b is inserted into the hollow inside of the hollow frame 3 at the pressing position of the upper mold 6a. In this state, the first auxiliary cylinder 7c of the upper die positioning portion 7 is operated to retract the rod 7d to the left, so that the upper die 6a presses the hollow shape member 3 as shown in FIG. In this state, the upper mold 6a is pulled to the left in the figure and smoothly starts operating to the left.

By this pulling, the upper die 6a is rotated by the support shaft 6e and is moved in the bending direction while pressing the hollow shape member 3 along the radius of the bending die 2. In this movement, the rod 6b is gradually extended by the operation of the bending cylinder 6c, and the roller-shaped upper die 6a rolls on the hollow shape member 3 to perform bending. By operating a pressure adjusting device (not shown) provided in the cylinder 6c, a constant pressing force is always applied to the upper mold 6a in accordance with the extension of the rod 6b. Further, along with the bending die 2, a component force to the left in the drawing is applied to the upper die 6a as the bending process progresses to a certain degree, but in this state, the component force to the right is opposite to the component force of the first auxiliary cylinder 7c. Bending proceeds while applying pressure. Since the component force increases with the progress of the bending process, the above-mentioned pressure applied to the first auxiliary cylinder 7c is also increased accordingly.

In the core support mechanism C, the core 11 a disposed at the tip of the rod 11 b of the core slide cylinder 11 c is fixed to the bending die 2 prior to the pressing for bending. It is inserted into the hollow of the shape member 3 and positioned at a position corresponding to the pressing position of the upper mold 6a. In this state, by operating the bending mechanism B, the rod 11b of the core slide cylinder 11c retracts so that the hollow profile 3 is gradually deformed from the linear state to the curved state along the radius of the bending die 2. At the same time, the second auxiliary cylinder 12c operates, and the core slide cylinder mounting base 10 gradually moves downward.

As the core slide cylinder mounting base 10 moves downward, the core slide cylinder 11c gradually rotates around the support shaft 11d, and this rotation causes the core 11a to move as shown in FIG. As described above, the position of the hollow die 3 is deformed along the radius of the bending die 2 at a position corresponding to the pressing position of the upper die 6a in the hollow tangent direction of the bending die 2 in a substantially tangential direction. . In this case, the bending cylinder 6c, the first auxiliary cylinder 7c, the second auxiliary cylinder 12c, and the core slide cylinder 11c are operated in synchronization by a synchronizing device (not shown). .

With the above configuration, even when using bending dies 2 having different curvatures, it is only necessary to replace the bending dies 2 and when processing hollow profile members 3 having different lengths. In addition, as shown by the broken line in FIG. 1, it is sufficient to mount the bending die 2 forward and backward to the positions of 2a and 2b, etc., and it is necessary to change the mounting positions of the bending mechanism B and the core support mechanism C each time. There is no.

Next, a second embodiment of the present invention will be described. In the second embodiment, as shown in FIG. 3, the pressing portion mounting base 15 movable by the guide rails 14a and 14b is provided with a pressing portion 16 corresponding to the pressing portion 6 of the first embodiment. Of the hollow shape member provided with a bending mechanism B'which is fixed and is moved in the bending direction of the bending die 2 by the upper die positioning portion 17 corresponding to the upper die positioning portion 7 in the first embodiment. It is configured as a bending device 1 '. That is, the pressing portion 16 is composed of a bending cylinder 16c that is operated by hydraulic pressure, and an upper die 16a that is rotatably attached to the bending cylinder 16c via a rod 16b and a spindle 16d. The bending cylinder 16c is fixed to the pressing portion mounting base 15 unlike the bending cylinder 6c of the first embodiment, which is rotatable by the support shaft 6e. At the time of bending, the upper die 16a rolls while pressing the hollow shape member 3 along the radius of the bending die 2 with a predetermined pressing force by the operation of a pressure adjusting device (not shown). Done. Reference numerals 14a and 14b are guide rails for moving the pressing portion mounting base 15 in parallel.

In the upper die positioning part 17, the first auxiliary cylinder 17c fixed to the first auxiliary cylinder mounting base 18 and operated by hydraulic pressure is connected to the pressing part mounting base 15 via the rod 17b. There is. During the bending process, the first auxiliary cylinder 17c operates to move the pressing portion 16 in parallel on the guide rails 14a and 14b in the bending direction along the radius of the bending die 2. In this case, the bending cylinder 16c and the first auxiliary cylinder 17c, the core slide mechanism 11c and the second auxiliary cylinder 12c of the core support mechanism C shown in FIGS. The point that the apparatus operates in synchronization is the same as that of the first embodiment, and other configurations and operations are also the same as those of the first embodiment.

In each of the embodiments described above, a pressing cylinder 4c for fixing the hollow shape member 3 to the bending die 2 and a bending work for bending the hollow shape member 3 along the bending die 2 Although the hydraulic cylinders 6c and 16c and the first auxiliary cylinder 7c and the second auxiliary cylinder 12c are hydraulic cylinders that operate by hydraulic pressure, other than this hydraulic cylinder, for example, pneumatic pneumatic cylinders. May be used, and it is naturally possible to configure the present invention by using an electric motor.

[0030]

[Effect of device]

 As described above, according to the present invention, even when performing bending processing in which the length of the hollow profile and the curvature of the bending die are different, it is only necessary to replace the bending die or change the mounting position. Both ends of the material can be bent at the same time. As a result, when attempting to bend both ends of the hollow profile at the same time, it is not necessary to adjust the rotation center axis, which is conventionally required, so the work man-hours are reduced and the efficiency is improved. It is possible to realize a device for bending a hollow shape member capable of performing bending work.

Further, by configuring the upper die that is in contact with the hollow shape member and presses the hollow shape member along the bending die as a rotation-independent roller, it is possible to smoothly perform the pressing movement of the hollow shape member. As a result, it is possible to realize a device for bending a hollow material which does not damage the hollow material as a product material during bending.

[Submission date] December 7, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

By this pulling, the upper die 6a is rotated by the support shaft 6e and is moved in the bending direction while pressing the hollow shape member 3 along the radius of the bending die 2. In this movement, the rod 6b is gradually extended by the operation of the bending cylinder 6c, and the roller-shaped upper die 6a rolls on the hollow shape member 3 to perform bending. Due to the operation of a pressure adjusting device (not shown) provided in the cylinder 6c, it is sufficient for the hollow die 3 to be bent along the bending die 2 in the upper die 6a according to the extension of the rod 6b. A pressing force is applied. Further, along with the bending die 2, when the bending process progresses to some extent, a component force to the left in the figure is applied to the upper die 6a, but in this state, a rightward direction opposing the component force to the first auxiliary cylinder 7c. The bending process proceeds while applying pressure to the. Since the component force increases as the bending process progresses, the pressure applied to the first auxiliary cylinder 7c is also increased accordingly.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a bending apparatus for a hollow shape member according to a first embodiment of the present invention.

FIG. 2 is a diagram showing the operation of each part of the apparatus during bending.

FIG. 3 is a schematic view of a main part of a bending apparatus for hollow members according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a bending device for a hollow shape member in a conventional example.

FIG. 5 is a diagram showing an operation of each part of the apparatus in the conventional example.

[Explanation of symbols]

 A ... Fixing mechanism B ... Bending mechanism B '... Bending mechanism C ... Core support mechanism 1 ... Bending device for hollow profile 1' ... Bending device for hollow profile 2 ... Bending die 3 ... Hollow section 4a ... Pressing part 4c ... Pressing cylinder 5 ... Pressing cylinder mounting base 6 ... Pressing part 6a ... Upper mold 6c ... Bending cylinder 7 ... Upper Mold positioning part 7c ... First auxiliary cylinder 8 ... Bending mechanism mounting base 9a ... Guide rail 9b ... Guide rail 10 ... Core slide cylinder mounting base 11a / Core 11c / Core slide cylinder 12c ・ Second auxiliary cylinder 13 ・ ・ Second auxiliary cylinder mounting base 14a ・ Guide rail 14b ・ Guide rail 15 ・ ・ Pressing part mounting base 16 ・ ・ Pressing part 17 ・ ・ Upper mold position Setting section

Claims (5)

[Scope of utility model registration request] 1. A bending apparatus 1, 1'for a hollow shape member, which bends by pressing an end of a hollow shape member 3 against a bending mold 2 using a core 11a. A fixing mechanism A for fixing the attached hollow shape member 3 to the bending die 2 and the bending shape 2 while pressing the hollow shape member 3 fixed by the fixing mechanism A with a predetermined pressing force. Pressing portions 6 and 16 for bending the hollow mold material 3 by moving in the bending direction from the start end to the end of the bending, and the upper die positioning portions 7 and 17 for moving the pressing portions 6 and 16 in the bending direction. Bending mechanisms B and B'having the following, and the core 11a are inserted into the hollow inside of the hollow frame 3, and the pressing portions 6 and 16 press the hollow frame 3 to move in the bending direction of the bending die 2. Of the hollow shape member 3 facing the pressing position of the pressing portions 6 and 16 when A core support mechanism C for sequentially locating the core 11a therein and changing its direction in a substantially tangential direction of the bending die 2 is provided. The bending die 2, the pressing portions 6, 16 and the core supporting mechanism. A bending device for a hollow member, wherein C and C are arranged on separate mounting bases. 2. The bending mechanism B is for bending work in which an upper die 6a is attached to the tip of a rod 6b at one end as the pressing portion 6 and the other end is rotatably supported by a mounting base 8 of the bending mechanism. Cylinder 6c and the upper die positioning portion 7
As one end of the rod 7b, the tip portion of the rod 7b
A first auxiliary cylinder 7 rotatably supported by 6 and the other end thereof is rotatably supported by a mounting base 8 of a bending mechanism.
The bending device for a hollow shape member according to claim 1, characterized in that 3. The bending mechanism B ′ includes a guide rail 14
The bending cylinder 16c having the upper die 16a attached to the tip of the rod 16b as the pressing portion 16 is fixed to the pressing portion mounting base 15 that moves in parallel by a and 14b.
As the upper die positioning portion 17, a first auxiliary cylinder 17c having a rod 17b tip portion connected to the pressing portion mounting base 15 is a first auxiliary cylinder mounting base 18.
The apparatus for bending a hollow section according to claim 1, wherein the apparatus is fixed to the hollow section. 4. The core support mechanism C includes the pressing portion 6,
In order to sequentially position the core 11a in the hollow inside of the hollow shape member 3 facing the pressing position of the pressing portions 6 and 16 when 16 presses the hollow shape member 3 and moves in the bending direction of the bending die 2. , A rod 11 having the core 11a at the tip thereof
When the core slide cylinder 11c having b and the pressing portions 6 and 16 presses the hollow shape member 3 and moves in the bending direction of the bending mold 2, the core 11a is sequentially moved in a substantially tangential direction of the bending mold 2. In order to change its direction, the core slide cylinder mounting base 10 that pivotally supports the core slide cylinder 11c and the core slide cylinder mounting base 10 are slid on the guide rails 9a and 9b. 4. A bending apparatus for a hollow frame member according to claim 1, further comprising a second auxiliary cylinder 12c for sequentially moving the hollow frame member 3 in a bending direction. 5. The hollow shape member according to claim 1, wherein the pressing portions 6 and 16 for bending the hollow shape member 3 by pressing are formed in a rotatable roller shape. Bending device.