JP3112301B2 - Sheet bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate bending machine,
In particular, the present invention relates to a sheet bending machine that performs forward bending and reverse bending by ironing bending.

[0002]

2. Description of the Related Art Generally, a sheet bending machine which performs forward bending and reverse bending by ironing bending is provided with a bottom die and a top die which are arranged vertically facing each other and grip a plate, and are arranged substantially horizontally behind the bottom die and the top die. With a bent bend beam,
The tip of the bend beam has a U-shape, and a bend die is attached to each of the upper and lower arms of the U-shape tip, and the combined movement of the eccentric shaft mechanism and the fluid pressure cylinder device causes When the bend beam is turned upward, the plate material gripped by the bottom die and the top die is bent forward by ironing by the lower bend die, while the bend beam is turned downward. Reverse bending by ironing bending of the gripping plate is performed by the upper bend die.

[0003]

In the above-mentioned plate material bending machine, a bend beam extends horizontally in the left-right direction behind a bottom die and a top die which grip the plate material, and is provided behind the bottom die and the top die. Has a back wall at the U-shaped tip of the bend beam, so the rising dimension of the bend (flange dimension) is limited by the dimension of the U-shaped tip, and the rising dimension is the U-shaped tip. It cannot be bent larger than the size of the pocket.

[0004] In the above-mentioned plate material bending machine,
In order to increase the rising dimension, there is also a problem that the machine becomes large and a large floor area is required for installation of the plate bending machine.

The present invention has been made in view of the above-mentioned problems in the conventional plate bending machine, and does not limit the rising dimension of bending, and can be designed to be miniaturized. It is an object of the present invention to provide a sheet bending machine having a new structure that does not require a large floor area for installation.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention supports a top die capable of holding a plate material between the bottom die and the lower die above a fixed table supporting the bottom die. Die support plate is provided so as to be movable up and down, and a forward bending portion and a reverse bending portion for vertically bending a rearward projecting portion of the plate material gripped by the bottom die and the top die are vertically separated from each other. In the plate bending machine in which the bent mold is provided so as to be vertically movable, the forward bending portion is provided above the reverse bending portion, and the forward bending portion is freely positioned at a position lower than the plate material and upward from below. A plate material is provided to be freely bendable, the reverse bent portion is positioned at a position higher than the plate material, and the plate material is provided to be freely bent from above to below, and a concave portion is provided between the forward bent portion and the reverse bent portion. Form It become one.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 to FIG. 3 show an embodiment of a sheet bending machine according to the present invention. The plate bending machine is a plate-shaped lower fixed table 3 vertically arranged between left and right side frames 1.
Bottom die 7 is fixed to the upper end of lower fixed table 3 by die holder 5 in a horizontal state.

The left and right side frames 1 respectively support left and right movable support plates 11 by means of a horizontal shaft 9 so that one end thereof can be rotated. The left and right movable support plates 11 are arranged adjacent to the inside of the left and right side frames 1, respectively, and their ends are connected to each other by a die support plate 13.
Can be turned up and down around the center. A top die 15 is fixed to the lower surface of the die support plate 13 in a horizontal state. When the movable support plate 11 is at the lowered position as shown in the figure, the top die 15 sandwiches the plate material W to be processed between the bottom die 7 and the bottom die 7, and grips the movable support plate 11. When it is at the ascending position rotated clockwise in FIGS. 1 and 2 from the descending position as shown in FIG. 1, it moves away from the bottom die 7 to release the gripping of the plate material W.

The rotation of the movable support plate 11 between the lowered position and the raised position as described above is performed by driving means (not shown).

The left and right side frames 1 rotatably support a single eccentric shaft 17 extending horizontally between them at the lower part thereof. Lower ends of left and right eccentric drive plates 21 which are disposed adjacent to the inside of each of the left and right side frames 1 and extend in the vertical direction are circumscribed with the eccentric shaft portion 19 of the eccentric shaft 17.

The left and right eccentric drive plates 21 extend up and down behind the bottom die 7 and the top die 15 (to the right in FIG. 1). One guide block 23, 25 is fixed. Guide rollers 29 attached to the left and right movable plates 27 as bend beams are engaged with the guide blocks 23 and 25, respectively.

Thus, both the left and right movable plates 27 can move up and down with respect to the eccentric drive plate 21, and the vertical movement range is the stopper block 31 fixed to the up and down movable plate 27.
Are in contact with the lower surface of the upper guide block 23 or the upper surface of the lower guide block 25.
The left and right movable plates 27 are connected to each other by a die support plate 33 and a backing plate support plate 35, and this connected body is defined as described above by the fluid pressure cylinder device 39 attached to the eccentric drive plate 21 by the bracket 37. It is driven up and down within the range described above, and is selectively located at one of a rising position as shown in FIG. 2 and a descending position as shown in FIG.

The whole of the eccentric drive plate 21, the vertically movable plate 27, the die support plate 33, and the backing plate support plate 35 are urged rightward in FIGS. 1 and 2 by a spring (not shown) to drive the eccentric drive. 1 and 2, a pressure roller 41 in contact with the plate 21 and a back-up roller 45 that is movable in the left-right direction in FIG. 1 and FIG. The rotation of the eccentric shaft 17 is restricted by the rotation of the rollers 41 and 4.
5 to move substantially vertically.

A bend die 47 is mounted on the die support plate 33 in a horizontal state. The bend mold 47 is integrally provided with a forward bending section 49 for forward bending upward and a reverse bending section 51 for reverse bending downward. Between them, a concave portion is formed as shown in FIGS.

The backup roller 45 is rotatably supported by a roller bracket 53, and the roller bracket 5
3 is movably supported by a fixed support member 55 in the left-right direction in FIGS. 1 and 2, that is, in the direction in which the bottom die 7 and the top die 15 are separated from each other. The rear surface (the right surface in FIGS. 1 and 2) of the roller bracket 53 is a vertical inclined surface 57, and the inclined cam surface 61 of the cam block 59 is slidably engaged with the inclined surface 57. I have. A feed screw 63 is engaged with the cam block 59, and the cam block 59 moves up and down by rotation of the feed screw 63,
The position of the roller bracket 53 in the left and right direction in FIGS.

The feed screw 63 is drivingly connected to a motor 69 by gears 65 and 67, and is driven to rotate forward and reverse by the motor 69. Driving of the electric motor 69 may be performed by a general electric control device.
In the drive control of No. 9, the bending process is performed in synchronism with the vertical movement of the eccentric drive plate 21 due to the rotation of the eccentric shaft 17 so that the bend mold 47 moves with a necessary locus for the required bending process of the plate material W. Is performed at a predetermined ratio according to the following.

In the case of performing a normal bending in the plate bending machine having the above-described configuration, as shown in FIG.
First, the upper and lower movable plate 27 and the die support plate 33 and the backing plate support plate 3 connected thereto by the fluid pressure cylinder device 39
5 is positioned at the lowering position, and the eccentric drive plate 21 is positioned at the lowermost position. As a result, the normal bending portion 4 of the bend mold 47 is formed.
9 is located at a predetermined initial position below the plate material W where the plate material W gripped by the bottom die 7 and the top die 15 should be bent forward.

Next, the eccentric shaft 17 is rotated clockwise from the state shown in FIG. 1, and the motor 69 is driven in synchronism with the rotation, so that the backup roller 45 is rotated.
The eccentric drive plate 21 is moved forward at a predetermined ratio with respect to the rising amount of the eccentric drive plate 21 due to the rotation of the dies, that is, moved in a direction approaching the bottom die 7 and the top die 15. As a result, the bend mold 47 moves with a curved trajectory that moves to the upper left as viewed in FIG. 1, and this movement causes the forward bending portion 49 of the bend mold 47 to move to the bottom die 7.
Then, the plate material W gripped by the top die 15 is subjected to the normal bending by the iron bending.

On the other hand, when performing reverse bending, as shown in FIG. 2, first, the upper and lower movable plate 27 and the die support plate 33 connected thereto by a hydraulic cylinder device 39.
And the backing plate support plate 35 are positioned at the raised position, and the eccentric drive plate 21 is positioned at the highest position. As a result, the reverse bending portion 51 of the bend mold 47 is moved between the bottom die 7 and the top die 1.
5, a reverse bending should be performed on the plate material W held by
It comes to be located at a predetermined initial position above the plate material W.

Next, the eccentric shaft 17 is rotated counterclockwise from the state shown in FIG. 2, and the motor 69 is driven in synchronization with the rotation, and the eccentric shaft 17 is rotated.
The eccentric drive plate 21 is moved forward at a predetermined ratio with respect to the descending amount of the eccentric drive plate 21 due to the rotation of the dies 7, that is, moved in a direction approaching the bottom die 7 and the top die 15. Thereby, the bend mold 47 is formed.
Moves with a curved trajectory that moves to the lower left as viewed in FIG.
By this movement, the reverse normal bending portion 51 of the bend mold 47 performs reverse bending by ironing bending on the plate material W held by the bottom die 7 and the top die 15.

Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to these embodiments, and various embodiments can be made within the scope of the present invention. Some will be apparent to those skilled in the art.

[0023]

As will be understood from the above description of the embodiment, in the present invention, the rearward projecting portion of the plate W gripped between the bottom die 7 and the top die 15 is directed upward. In a bend mold 47 provided with a forward bending portion 49 for ironing and a reverse bending portion 51 for vertically bending downward, the forward bending portion 49 is provided above the reverse bending portion 51. It is. And the forward bending portion 4
9 can be positioned below the plate W and can be bent upward from below, and the reverse bent portion 51 can be positioned above the plate W and the plate W can be moved downward from above. And a concave portion is formed between the forward bending portion 49 and the reverse bending portion 51.

Therefore, the bottom die 7 and the top die 1
5 can be bent in the vertical direction by the forward bending portion 49 and the reverse bending portion 51, and the forward bending portion 49 performs forward bending. In some cases, for example, the plate material W can be protruded to a position above the normal bending portion 49, and there is no limitation on the rising dimension of the bending.

The forward bending portion 49 and the reverse bending portion 51
After the concave portion is formed in between, the rear protruding portion of the plate material W is vertically bent by the forward bending portion 49 or the reverse bending portion 51, and then folded further in consideration of springback or the like. It can be bent.

That is, according to the present invention, the forward bending portion 49
Is provided above the reverse bending portion 51, and a concave portion is formed between the forward bending portion 49 and the reverse bending portion 51,
In the configuration in which the plate material W is ironed and bent, the rising portion of the bent portion is not limited, and the size can be reduced as compared with the size of the rising portion, and the conventional problem can be solved. Accurate bending can be performed in consideration of springback.

[Brief description of the drawings]

FIG. 1 is a side view showing a sheet bending machine according to the present invention during a forward bending operation.

FIG. 2 is a side view showing the sheet bending machine according to the present invention at the time of reverse bending operation.

FIG. 3 is a front view of the sheet bending machine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side frame 3 Lower fixed table 7 Bottom die 11 Movable support plate 13 Die support plate 15 Top die 17 Eccentric shaft 19 Eccentric shaft part 21 Eccentric drive plate 27 Vertical movable plate 33 Die support plate 35 Backing plate support plate 41 Pressure roller 45 Backup roller 47 Bend die 49 Forward bending part 51 Reverse bending part 53 Roller bracket 59 Cam block 63 Feed screw

Claims (1)

(57) [Claims] 1. A die support supporting a top die (15) capable of holding a plate material (W) between the bottom die (7) and a lower fixed table (3) supporting a bottom die (7). A plate (13) is provided to be vertically movable, and a forward bending portion (49) for vertically bending a rearwardly protruding portion of the plate (W) gripped by the bottom die (7) and the top die (15). ) And a bend die (47) having a vertically bent portion (51) which is vertically separated from each other, and is capable of vertically moving. The upper bent portion (49) is provided at a position lower than the plate material (W), and the plate material (W) is provided so as to be able to bend upward from below, and the reverse bent portion (51) is provided at the upper portion. Positionable above the plate (W) and below from above A plate bending machine characterized in that a plate (W) is provided so as to be freely bent in the direction, and a concave portion is formed between the forward bending portion (49) and the reverse bending portion (51).