JPH087939Y2 - Plate bending machine - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to a plate bending machine, and more specifically,
The present invention relates to a plate material bending machine that vertically bends an edge portion of a plate material into an L shape.

(Prior Art) Conventionally, in a plate material bending machine, an upper plate for pinching and fixing the plate material is provided on a lower plate extending in the left-right direction so as to be vertically movable. In addition, a bending die provided with a lower bending die and an upper bending die, which are vertically separated from each other, for bending the edge portions of the plate materials fixed to the lower board and the upper board by pressing upward or downward. It has a frame that can move up and down.

The bending drive device for moving the bending die frame up and down is carried out by the operation of a fluid pressure operated cylinder. For example, the stroke of the cylinder stops at four times the plate thickness of the plate material. In addition, when the plate material is overbended, an eccentric shaft that serves as the center of rotation of the bending die frame is provided on the plate material processing line, and the eccentric shaft is rotated to make the lower bending die or the upper bending die equipped in the bending die frame. It is common to move the mold and process it.

(Problems to be solved by the invention) By the way, in the above-mentioned conventional plate bending machine, the bending die frame can be moved up and down by a fluid pressure operated cylinder which is a bending drive device, and the stroke adjustment of this cylinder is performed by an upper limit valve. Since it is performed by using, the stopping accuracy is poor and the ascending and descending speed cannot be accelerated.
Further, there is a problem that the bendable frame is tilted to the left and right and cannot be corrected.

Also, when the eccentric shaft of the bending die frame is rotated to overbend, for example, to bend the plate material in the upward direction, the bending drive device is first actuated without rotating the eccentric shaft to move the bending die frame in the upward direction. Rotate to. When the lower bending die rises to a predetermined elevated position, the eccentric shaft is rotated to move the bending die frame in the forward direction.

There is also a problem that the speed is not increased because the above-mentioned operation, that is, the two-step motion is performed.

[Constitution of device]

(Means for Solving the Problems) In view of the conventional problems as described above, the present invention provides a fixing frame provided with a lower plate extending in the left-right direction, and a plate material can be fixed by being sandwiched between the lower frame and the lower frame. An elevating frame provided with an upper plate is provided so as to be movable up and down, and a rear end edge portion of a plate material clamped and fixed by the lower plate and the upper plate is bent downward into an L-shape and upward. A lower bending die which is bent into an L shape is vertically separated from each other, and a rear end portion of a bending die frame which is vertically swingable is pivotally attached to the frame, and the bending die frame is vertically swung. In a plate material bending machine provided with a bending drive device for moving, the pivotal position of the bending die frame is moved in the up-down and front-rear direction according to the plate thickness of the plate material and the bending direction of the rear end edge. It is provided so that it can be adjusted and it is located above the line X-X of the plate material. When the bending die frame is provided in a displaced position and the rear end edge portion is bent upward by swinging the bending die frame upward, the locus of the lower bending die is overbended to form a rising curve. is there.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, the plate material bending machine 1 is provided with an elevating frame 5 which is vertically movable above a fixed frame 3.

More specifically, the fixed frame 3 has a substantially box shape, and a lower plate 9 is appropriately fixed to an upper portion of a vertical front plate 7 which constitutes a part of the fixed frame 3. is there. The lower plate 9 supports the plate material W to be bent, and is provided so as to extend in the vertical direction with respect to the drawing.

The elevating frame 5 is constructed by appropriately arranging a plurality of arm plates 11 extending in the front-rear direction (left-right direction in FIG. 1). At the front end of each arm plate 11, a plate pressing plate 13 extends in the vertical direction with respect to the paper surface and is integrally fixed, and the rear end of each arm plate 11 is perpendicular to the paper surface. It is integrally fixed to the connecting plate 15 extending in the direction.

In order to support the elevating frame 5 so that it can move up and down with respect to the fixed frame 3, swing brackets 17 are provided at appropriate positions on the connecting plate 15. This swing bracket
The reference numeral 17 is swingably supported by a generally clevis-shaped bearing bracket 19 standing upright on the fixed frame 3 via a pivot 21. An upper plate 23 is provided on the elevating frame 5 in order to clamp and fix the plate material W to be bent on the lower plate 9.

With the above structure, the plate frame W is pinched and fixed between the lower plate 9 and the upper plate 23 by swinging the elevating frame 5 up and down about the pivot 21, so that the fixing is released. .

An elevating device 25 is provided to move the elevating frame 5 up and down. More specifically, the lifting frame 5
Support plates 27 are respectively attached to the facing surfaces of the arm plates 11 in the above, and fluid pressure cylinders 29 are arranged between the support plates 27 as an example of a lifting operation device. The end clevis 31 of each of the fluid pressure cylinders 29 is pivotally supported by a bearing 33 provided on the fixed frame 3 via a pin 35, and a connecting member 39 provided on a piston rod 37 protruding upward is provided with the support plate. Bearings installed on 27
It is pivoted to pin 41 via pin 43.

With the above configuration, by appropriately operating the fluid pressure cylinder 29, the elevating frame 5 is swung in the vertical direction.
Therefore, by lowering the elevating frame 5,
The plate material W placed and positioned on the lower board 9 is fixed to the lower board 9 by the upper board 23. Further, by raising the elevating frame 5, the clamping fixing of the plate material W is released.

A plate material W which is fixed by pressing with the lower plate 9 and the upper plate 23.
A lower bending die 45 and an upper bending die 47 are provided separately from each other in the vertical direction in order to bend the rear end edge portion in the upward or downward direction into an L shape. More specifically, the upper and lower bending dies 45,47
Is provided so as to extend in the vertical direction with respect to the plane of the paper with a length substantially the same as that of the lower plate 9, and the upper and lower bending dies 45, 47 are arranged at the rear positions of the lower plate 9 and the upper plate 23. The bending die holder 49 is provided so as to face it vertically.

The bending die holder 49 extends in the vertical direction with respect to the paper surface, and is supported by the front end portion of a bending die frame 51 provided in a proper position and movable in the vertical direction. This bendable frame 51
A bracket 53 is integrally provided at the rear end of the
-At the position displaced by a predetermined distance upward from the machining line of the plate material W indicated by the X-ray, it is rotatably supported by the eccentric portion 55E of the eccentric shaft 55 rotatably supported by the bearing bracket 19. . Although not shown, the eccentric shaft 55 is connected through a speed reducer to a motor capable of rotating in the forward and reverse directions, such as a pulse motor or a servo motor.

A bending drive device 57 is provided on the bending die frame 51 in order to swing the bending die frame 51 in the vertical direction and bend the rear end edge of the plate material W by the upper and lower bending dies 45 and 47. ing. More specifically, the bending drive device 57
Is a fluid pressure cylinder 59 in this embodiment. The fluid pressure cylinder 59 is swingably supported by a bearing 63 integrally provided on the bending die frame 51 via a trunnion 61. The lower end portion of the piston rod 65 projecting downward from the fluid pressure cylinder 59 has the fixed frame 3
It is pivotally supported by a bracket 67 mounted on it via an eccentric pin 69.

Although not shown, the eccentric pin 69 is connected through a speed reducer to a motor capable of rotating in the forward and reverse directions, such as a pulse motor or a servo motor.

With the above configuration, by rotating the eccentric pin 69,
The strokes of the upper and lower bending dies 45 and 47 are adjusted with respect to the plate material processing line XX, and the bending die frame 51 can be vertically swung by the operation of the fluid pressure cylinder 59. Therefore, the rear end edge of the plate material W clamped and fixed between the lower plate 9 and the upper plate 23 can be bent upward by the downward bending die 45 or downward by the upward bending die 47.

Further, when the rear edge of the plate material W is bent upward or downward, the eccentricity is changed so that the swing center of the bending die frame 51 is changed up and down according to the plate thickness and the direction of bending. Rotate the shaft 55. By appropriately rotating the eccentric shaft 55, the center of the eccentric portion 55E of the eccentric shaft 55 shifts in the vertical and longitudinal directions. Therefore, the swing center of the bending die frame 51 can be largely moved in the vertical and longitudinal directions according to the thickness of the plate material W and the bending direction of the rear edge of the plate material W.

Next, the operation according to this embodiment will be described in more detail.

2 and 3, the operation according to this embodiment is shown in FIG. 2, and the operation according to the conventional configuration is shown in FIG. 3 for comparison.

In FIG. 2, the eccentric shaft 55 provided at the base of the bendable frame 51 is displaced by a predetermined distance in the upward direction from the machining line X-X line of the plate material W by a predetermined distance. There is.

With the above configuration, when the rear end edge of the plate material W is bent upward in an L-shape, the lower bending die 45 can be operated only by raising the fluid pressure cylinder 59 of the bending drive device 57 without operating the eccentric shaft 55. Since the locus of is overbend and draws a rising curve,
The bent portion of the plate material W can be made into an acute angle to perform accurate bending, and the processing speed can be increased.

In the conventional example shown in FIG. 3, as can be understood from the drawing, a bending frame is formed on the processing line X-X line of the plate material W.
An eccentric shaft 103 of 101 is provided. For this reason, the lower bending type
Since the ascending locus of 105 is farther than the plate material W to be bent above the machining line X-X line, it cannot be bent at a right angle due to the spring back of the plate material, and the eccentric shaft 103 is rotated during the bending process. Then, the bending die frame 101 is advanced by the amount of eccentricity Z to perform the working. Then 2
It becomes a step motion and the bending speed cannot be increased.

As described above, according to this embodiment, the normal bending work, that is, the work of bending the end edge portion of the plate material W upward is overwhelmingly common, and therefore the eccentric shaft 55 is operated at this time. Instead, it is sufficient to operate only the bending drive device 57, so that it is possible to improve the bending accuracy and the processing speed. Further, the stroke of the bending drive device 57 can be adjusted by an eccentric pin.
By operating 69, adjustment can be made freely, stopping accuracy and speed can be increased, and productivity can be improved.

The present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes.

[Effect of device]

As can be understood from the above description of the embodiments, in short, the present invention provides a fixed frame (3) having a lower plate (9) extending in the left-right direction, and a plate material between the lower plate (9) and the fixed frame (3). (W) is provided with a lifting frame (5) having an upper plate (23) which can be fixed by sandwiching, and is vertically movable, and a plate member (W which is held and fixed by the lower plate (9) and the upper plate (23). ) An upper bending die (47) for bending the rear end edge portion downwardly into an L-shape and a lower bending die (45) for upwardly bending it into an L-shape are provided vertically above and below each other and are provided in the vertical direction. A bending drive device (57) for pivotally attaching the rear end of the swingable bending die frame (51) to the frame and swinging the bending die frame (51) up and down.
In a plate material bending machine, the position of the pivotal position of the bending die frame (51) is adjusted in the vertical and longitudinal directions according to the plate thickness of the plate material (W) and the bending direction of the rear edge portion. And the processing line XX of the plate material (W)
When the bending die frame (51) is swung upward and the rear end edge portion is bent upward by being provided at a position displaced above the line, the locus of the lower bending die (45) is It is configured to overbend and draw a rising curve.

As apparent from the above configuration, in the present invention,
Since the pivotal position of the bendable frame 51 is adjustable in the vertical and longitudinal directions, the lower plate 9, the upper plate 23 and the bendable frame 51 can be adjusted.
The space between the upper and lower bending dies 47, 45 provided on the 51 can be adjusted according to the plate thickness of the plate material W.

The pivotal position is provided at a position displaced upward from the machining line X-X line of the plate material W, and the bending frame is provided.
When the rear end portion of the plate material W is bent upward by swinging 51, the locus of the lower bending die 45 is configured to overbend to form an upward curve. When bending in an L-shape in the same direction, overbending can be performed in the same way as bending by only one motion of swinging the bending die frame 51 upwards, improving bending precision and efficiency. It can be achieved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a main part of a plate bending machine for carrying out the present invention. FIG. 2 is an operation explanatory view, and FIG. 3 is an operation explanatory view of a conventional plate material bending machine. 1 …… Plate bending machine 3 …… Fixed frame 5 …… Lifting frame 9 …… Lower plate 23 …… Upper plate 45 …… Lower bending mold 47 …… Upper bending mold 51 …… Bending mold frame 55 …… Eccentricity Shaft 57 …… Bending drive 69 …… Eccentric pin

Claims (1)

[Scope of utility model registration request] 1. An upper plate (23) on which a plate material (W) can be clamped and fixed between a fixed frame (3) having a lower plate (9) extending in the left-right direction and the lower plate (9). An elevating frame (5) provided with is vertically movable, and a rear end edge portion of a plate member (W) clamped and fixed by the lower plate (9) and the upper plate (23) is formed in an L shape downward. The rear end of the bending die frame (51), which includes an upper bending die (47) for folding and a lower bending die (45) for folding upward in an L-shape and which is vertically movable and is swingable in the vertical direction. In a plate material bending machine, wherein the bending die frame (51) is provided with a bending drive device (57) for swinging the bending die frame (51) up and down. The pivot position is provided so as to be adjustable in the vertical and longitudinal directions according to the plate thickness of the plate material (W) and the bending direction of the rear end edge portion, and the plate material (W ) Provided at a position displaced upward from the processing line X-X line, and when the bending frame (51) is swung upward to bend the rear end edge portion upward, the downward bending is performed. A plate material bending machine characterized in that the locus of the die (45) is constructed so as to overbend and draw a rising curve.