JPH0724864B2 - Plate bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a bending machine for bending an edge portion of a plate material in an up-down direction into an L shape, and more specifically, to a plate material. The present invention relates to a bending machine capable of continuously bending the edge portion of the vertical direction.

(Prior Art) A plate material bending machine capable of continuously bending the edge of the plate material up and down is equipped with an upper plate that vertically fixes the plate material to a lower plate that supports the plate material so that it can move up and down. There is. Further, a lower bending die and an upper bending die are provided to face each other in the vertical direction in order to vertically bend the edge portion of the plate material protruding from between the lower panel and the upper panel.

(Problems to be Solved by the Invention) In the above structure, in order to bend the edge portion of the plate material, a bending drive device having a movable portion that can move in the vertical direction is provided, and this movable portion is It is connected to a bendable frame. Here, since the vertical movement amount (stroke amount) of the movable portion in the bending drive device when the end portion of the plate material is bent upward or downward is always constant, the movement amount of the movable portion is set as follows. It is difficult to set a predetermined amount of movement according to the thickness, material, etc., and therefore, there has been a problem that the bending accuracy deteriorates.

[Structure of the Invention] (Means for Solving Problems) In order to solve the above-mentioned conventional problems, in the present invention, the lower plate is fixedly provided on a fixed frame, and cooperates with the lower plate. The upper plate that clamps and fixes the plate material is installed on the vertically movable lifting frame, and the downward bending is performed to bend the edge of the plate material that is sandwiched and fixed by the lower plate and the upper plate upward and downward. A bending die frame provided with a die and an upper bending die separated from each other in the up and down direction is provided so as to be movable in the up and down direction. A drive unit is provided, and the movable portion is connected to a bending die frame, and when the edge of the plate material is bent upward, the amount of continuous movement of the movable portion in the upward direction and the edge of the plate material are The amount of continuous downward movement of the movable part when bending downward The movement amount adjustment device provided for adjusting sometimes the movement amount regulating device characterized by comprising a control motor which enables fine adjustment.

(Operation) With the above-described configuration, the plate member is clamped and fixed by the cooperation of the upper plate and the lower plate by moving the movable portion upward by driving the bending drive device and moving the bending die frame upward. The end edge portion of can be bent upward in an L-shape by a downward bending die. Further, by driving the bending drive device to move the movable portion downward to move the bending die frame downward, the edge portion of the plate material that has been fixed under strong pressure is bent downward into an L-shape by the upward bending die. be able to.

In the above bending process, by the movement amount adjusting device in advance,
What is the amount of continuous upward movement of the movable part when the edge of the plate is bent upward and the amount of continuous downward movement of the movable part when the edge of the plate is bent downward? Since it can be adjusted, the movement amount of the movable portion can be set to a predetermined movement amount corresponding to the material of the plate material, the plate thickness, etc. in the final stage of bending.

(Embodiment) Referring to FIG. 1, FIG. 2 and FIG. 3, a plate material bending machine 1 according to this embodiment is provided with an elevating frame 5 which is vertically movable above a fixed frame 3. It is a thing.

More specifically, the fixed frame 3 is roughly box-shaped, and the lower plate 9 is appropriately fixed to the upper part of the 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 as shown in FIG. 1, is provided so as to extend in the left-right direction.

As can be understood from FIGS. 2 and 3, the lifting frame 5 includes a plurality of arm plates extending in the front-rear direction (vertical direction in FIG. 2, left-right direction in FIG. 3).
11 are arranged in the left-right direction at appropriate intervals. The front end portion of each arm plate 11 is integrally fixed to a plate holding plate 13 extending in the left-right direction, and the lower rear end portion of each arm plate 11 is a connecting plate extending in the left-right direction.
It is fixed integrally to 15.

In order to support the elevating frame 5 so as to be movable up and down with respect to the fixed frame 3, swing brackets 17 (first and second side portions and central portion in this embodiment) are provided at appropriate portions of the connecting plate 15. (See FIG. 3). The swing bracket 17 is swingably supported by a roughly clevis-shaped bearing bracket 19 standing upright on the fixed frame 3 via a pivot 21.

In order to bring a minute gap between the bearing portion of the swing bracket 17 and the pivot shaft 21 to one side, the bearing bracket 19
A fixing member 23 extending in the left-right direction is provided at the rear part of the rear part. The rocking bracket 17 is moved forward between the pressing block 27 and the fixed member 23, which are in sliding contact with the arcuate sliding member 25 attached to the rear portion of the rocking bracket 17, as shown in FIG. ) Is mounted with a bullet 29 such as a disc spring or urethane rubber.

With the above configuration, the swing bracket is actuated by the action of the bullet 29.
17 is always pressed in the forward direction, and the minute gap between the bearing portion of the swing bracket 17 and the pivot shaft 21 is in the state of being moved to the front side (left side in FIG. 3). Therefore,
Even if the lifting frame 5 receives an external force to the left in FIG. 3, it does not move. Further, with the above configuration, the elevating frame 5 is swingable in the vertical direction about the pivot 21.

An upper plate 31 is provided on the elevating frame 5 in order to fix the plate material W to be bent on the lower plate 9. More specifically, as shown in FIG. 1, the upper board 31 includes a plurality of selectable upper boards 33 made of thin plates and a plurality of block upper boards 35 located on both sides of the selected upper board 33. The length of the plate W can be appropriately adjusted in accordance with the width of the plate W.

The configuration for adjusting the length of the upper plate 31 by selecting the number of the selection upper plates 33 and the block upper plates 35 is not important in the present embodiment, and a known mechanism is adopted if necessary. Since it is also possible to do so, detailed description thereof will be omitted.

In order to support the upper plate 31, an upper plate holder 37 extending in the left-right direction is integrally attached to the lower portion of the plate pressing plate 13 provided on the elevating frame 5, and the upper plate holder 37 A T-shaped groove 39 is formed in the left-right direction on the lower surface. The T groove 39 is provided with the T provided on the upper portion of the block upper board 35.
The projection 41 is slidably engaged.

With the above configuration, by swinging the elevating frame 5 up and down about the pivot 21, the plate material W is pinched and fixed between the lower plate 9 and the upper plate 31, and the fixing is released. .

In order to move the elevating frame 5 up and down, the elevating frame 5 is provided with an elevating operation device 43. More specifically, as shown in FIGS. 2 and 3, the lifting frame 5
A support plate 45 is attached to each of the facing surfaces of the arm plate 11 in FIG.
A fluid pressure cylinder 47 as an example of the lifting / lowering operation device 43 is arranged. A trunnion 49 is provided on each side of each fluid pressure cylinder 47.
Are supported by bearings 51 attached to each support plate 45. That is, each fluid pressure cylinder 47 is swingably supported by the elevating frame 5.

The piston rod 53 protruding downward from the fluid pressure cylinder 47 is screwed and connected to the upper end portion of the column 55. The lower end of the column 55 is pivotally supported by a bearing 57 mounted on the fixed frame 3 via a pin 59. A step portion 61 is formed on the upper end of the support column 55, and a seat plate 63 fitted to the support column 55 is supported by the step portion 61.

The seat plate 63 is penetrated by a plurality of adjusting bolts 65 vertically provided on the fluid pressure cylinder 47.
Reference numeral 65 is an adjusting nut that adjusts the stored force of an ammunition machine 67 such as a disc spring or urethane rubber mounted between the seat plate 63 and the fluid pressure cylinder 47 and the amount of lifting of the elevating frame 5 by the ammunition machine 67. 69 is screwed. The bullet 67 is sufficiently charged to push up the elevating frame 5 and the like.

With the above-described configuration, by appropriately operating the fluid pressure cylinder 47, the elevating frame 5 is vertically swung. Therefore, by lowering the elevating frame 5, the plate material W placed and positioned on the lower plate 9 is moved to the upper plate 31.
As a result, it is fixed to the upper board 9 by pressure. Further, by raising the elevating frame 5, the clamping fixing of the plate material W is released. At this time, when the supply of the working fluid to the fluid pressure cylinder 47 is stopped and the fluid pressure cylinder 47 is put into a resting state, the elevating frame 5 is slightly pushed up by the action of the ammunition 67, and the plate material W is clamped. It will release the fixation.

The lower bending die 71 and the upper bending die 73 are moved up and down in order to bend the rear end edge of the plate material W, which is pinched and fixed by the lower board 9 and the upper board 31, upward or downward in an L shape. It is provided separately. More specifically, the upper and lower bending dies 73,71
Are provided to extend in the left-right direction to have substantially the same length as the lower board 9, and the upper and lower bending dies 73, 71 are provided in a bending die holder 75 arranged at the rear position of the lower board 9 and the upper board 31. They are provided so as to face each other vertically.

The bending die holder 75 is extended in the left-right direction, and the vicinity of the left and right end portions and the central portion of the bending die holder 75 are supported by the front end portion of a bending die frame 77 that is vertically swingable. More specifically, as understood from FIGS. 2, 3 and 4, the bending die frame 77 is composed of a pair of right and left swing plates, and the rear end portion of the bending die frame 77. Is rotatably supported by an eccentric portion 79E of an eccentric shaft 79 which is rotatably supported by the bearing bracket 19 at a height position substantially the same as that of the pivot shaft 21.

Means for urging the bending die frame 77 in one direction is provided in order to bring the minute gap between the eccentric portion 79E of the eccentric shaft 79 and the pivotal support portion of the bending die frame 77 to one side. More specifically, as shown in FIG. 4, one end of a pull rod 83 is pivotally connected to the rear end of the bending frame 77 via a ball joint 81. Although not shown in detail in the drawings, the pull rod 83 penetrates through the fixing member 23 and is swingably supported, and includes a bullet seat 85 attached to the other end of the pull rod 83 and the fixing member 23. In the meantime, an ammunition machine 87 such as a disc spring or urethane rubber that acts to pull the pull rod 83 backward is mounted.

As can be understood from the above structure, the bendable frame 77 is vertically swingable about the eccentric portion 79E of the eccentric shaft 79, and is always pulled backward by the action of the ammunition 87. is there. Therefore, the minute gap between the eccentric portion 79E of the eccentric shaft 79 and the pivotal support portion of the bendable frame 77 is always in the state of being moved to the rear side. Therefore, even if an external force is applied to the bending die frame 77 in the rearward direction (to the right in FIG. 3), the bending die frame 77 does not move at all.

The bending die frame 77 is provided with a bending driving device 89 for swinging the bending die frame 77 in the vertical direction and bending the rear end edge of the plate material W by the upper and lower bending die 71, 73. More specifically, the bending device 89 is composed of a fluid pressure cylinder 89 in this embodiment. A cylinder body 91 of the fluid pressure cylinder 89 is swingably supported by a bending frame 77 via a trunnion 93. Piston rod 95 protruding downward from this cylinder body 91
The lower end portion (see FIG. 5) is pivotally supported by a bracket 97 mounted on the fixed frame 3 via a pin 99.

In this embodiment, the cylinder body 91 of the fluid pressure cylinder 89 is used as the movable portion, but the piston rod 95 may be used as the movable portion.

With the above configuration, the bending die frame 77 can be vertically swung by the operation of the fluid pressure cylinder 89. Therefore, the rear end edge of the plate material W clamped and fixed between the lower board 9 and the upper board 31 can be bent upward by the downward bending die 71 or downward by the upward bending die 73.

When the rear end edge of the plate material W is bent upward or downward as described above, the swing center of the bending die frame 77 should be changed vertically depending on the plate thickness and the direction of bending. A rotation drive device 99 for rotating the eccentric shaft 79 is provided. More specifically, as shown in FIGS. 1 and 2, on one side of the fixed frame 3, a motor 101 such as a pulse motor or a servo motor capable of rotating in the normal and reverse directions is mounted, and Reduction gear 103 that works with motor 101
Is attached. The output shaft of the speed reducer 103 is connected to the eccentric shaft 79.

Therefore, by properly controlling the rotation of the motor 101, the eccentric shaft 79 is appropriately rotated. That is, by appropriately rotating the eccentric shaft 79, the center of the eccentric portion 79E of the eccentric shaft 79 shifts in the vertical and horizontal directions in FIG. Therefore, the plate thickness of the plate material W and the plate material W
The swing center of the bending die frame 77 can be adjusted vertically and horizontally according to the bending direction of the rear end edge. Further, the bending frame 77 can be largely moved in the front-rear direction (left-right direction in FIG. 3).

As described above, when rotating the eccentric shaft 79, a lifting operation device
Even if the upper plate 31 firmly clamps and fixes the plate material by the action of 43, the eccentric shaft 79 is not affected in any way. Therefore, the eccentric shaft 79 can be smoothly rotated, and when the eccentric shaft 79 is rotationally positioned, an appropriate detection device can be added to automatically and accurately perform the rotational positioning.

With the above-described structure, according to the present embodiment, when the rear end edge of the plate material W is bent, the swing center of the bending frame 77 can be adjusted to an arbitrary position such that it is aligned with the upper surface or the lower surface of the plate material W. . Further, the distance between the lower platen 9, the upper platen 31 and the upper and lower bending dies 71, 73 with the plate material W clamped and fixed can be adjusted according to the thickness of the plate material W, so that the bending process can be performed more accurately. You can Further, after the bending of the plate material W is completed, the bending die frame 77 is moved to the left in FIG. 3, and the upper and lower bending dies 71 and 73 are used to bend the rear edge portion of the plate material W at a more acute angle. Springback can be corrected.

As described above, the bending die frame 77 is swung in the vertical direction by the operation of the fluid pressure cylinder 89 to bend the rear end edge of the plate material W. At this time, in order to correct the bending of the upper and lower bending dies 71, 73 due to the resistance of the plate material W,
A movement amount adjusting device is provided for individually adjusting the continuous movement amount (stroke amount) of each cylinder body 91. This movement amount adjusting device has a continuous upward movement amount of the cylinder body 91 when the edge portion of the plate material W is bent upward, and a downward movement amount when the edge portion of the plate material W is bent downward. The amount of continuous movement in the direction is adjusted at the same time.

In the present embodiment, this movement amount adjusting device includes a support plate 107, pinions 109, 111 and 121, a rack rod 11 which will be described later.
5, 117, 123, a slide plate 127, control valves 129, 131, a control motor 151, etc. are provided.

That is, as shown in detail in FIGS. 4 and 5, the fixing plate 105 fixed to the upper surface of the fixing frame 3 in the vicinity of each cylinder body 91 is provided with a rearward direction (upward direction in FIG. 4). ) Is attached integrally with the support plate 107. A pinion shaft 113 having pinions 109 and 111 respectively near both ends is rotatably supported on the fixed plate 105.The one pinion 109 has an upper end portion appropriately connected to the cylinder body 91 and an upper and lower end portions. The direction rack rod 115 is meshed. Therefore, the pinion shaft 113 is normally and reversely rotated according to the vertical movement of the cylinder body 91.

A first operating rack rod 117 is meshed with the other pinion 111 of the pinion shaft 113. The first working rack rod 117 is
It is slidably supported by a pinion support block 119 attached to the side surface of the support plate 107 and meshes with a pinion 121 rotatably supported by the pinion support block 119. On the pinion support block 119, a second operating rack rod 123, which is opposed to the first operating rack rod 117 and meshes with the pinion 121, is slidably supported.

Therefore, depending on the vertical movement of the cylinder body 91,
The second working rack rods 117 and 123 move in opposite directions by the same distance.

As shown in detail in FIG. 5, the support plate 107
A guide member 125, which is parallel to the moving direction of the first and second operating rack rods 117 and 123, is mounted on the side surface of the slide plate 127, and a slide plate 127 is movably supported on the guide member 125.
The slide plate 127 has an amount of continuous upward movement of the cylinder body 91 when the edge of the plate W is bent upward, and when the edge of the plate W is bent downward. Control valves 129 and 131 for restricting and controlling the downward movement amount of the cylinder main body 91 are mounted at symmetrical positions.

The control valves 129 and 131 are respectively provided with plungers 133
Each operating lever 1 pivotally supported on the slide plate 127
When the pushing operation is performed by one end of 35, 137, it acts to stop the supply of the working fluid to the fluid pressure cylinder 89. The other end of each of the operating levers 135 and 137 is
The first and second operating rack rods 117, 123 are provided so as to face one ends thereof. Therefore, each actuating lever 135, 137 is
When operated by the first and second operating rack rods 117, 123, the control valves 129, 131 are pressed.

In addition, swing levers 139 and 141 are integrally attached to the operating levers 135 and 137, respectively.
The tip portion of 41 is located between the plurality of limit switches LS1 to LS4 arranged so as to face the slide plate 127.
Therefore, the output signals of the limit switches LS1 to LS4 cause the first and second operating rack rods 117 and 123 to operate the operating lever 13
It can detect whether or not it touches 7,139.

In order to move the slide plate 127 along the guide member 125, a nut member 143 is attached to the slide plate 127, and a screw rod 145 rotatably supported by the support plate 107 is attached to the nut member 143. It is screwed. This screw rod 1
Pulley 147 is attached to one end of 45.
A belt 149 wound around 47 is wound around a drive pulley 153 attached to a control motor 151 supported by a support plate 107.

With the above configuration, by appropriately rotating the control motor 151, the slide plate 127 is moved along the guide member 125. Therefore, the distance between the ends of the first and second operating rack rods 117 and 123 and the operating levers 135 and 137 is adjusted. That is, the amount of vertical movement of the cylinder body 91 is adjusted at the same time.

Therefore, of the plurality of fluid pressure cylinders 91 arranged,
By appropriately controlling the stroke amount of the fluid pressure cylinder 91 on the central side to be different from the strokes of the fluid pressure cylinders on both sides, when each fluid pressure cylinder 91 reaches a controlled stroke end, The center of the bending dies 71, 73 may be curved upward or downward as desired. Therefore, when bending the rear end edge of the plate material W, it is possible to correct the tendency that the upper and lower bending dies 71, 73 bend due to the drag force of the plate material W and the bending in the vicinity of the central portion becomes weak, and the bending accuracy can be improved. It can be improved.

Further, the control motors 151 are simultaneously rotated in the same direction by the same amount, and the vertically controlled stroke ends of the fluid pressure cylinders 91 are simultaneously adjusted, so that the vertical bending according to the plate thickness of the plate material W is performed. The positions of the molds 71 and 73 at the end of bending can be adjusted.

Further, by individually adjusting the amount of vertical movement of each cylinder body 91, for example, even when the upper and lower bending dies 71, 73 are slightly inclined due to an assembly error, etc. Can be corrected horizontally.

[Effects of the Invention] As can be understood from the above description of the embodiments, since the moving amount adjusting device can adjust the continuous moving amount of the movable portion in the bending driving device when bending the plate material, In the final stage of the bending process, the continuous movement of the movable portion can be set to a predetermined movement amount corresponding to the material of the plate material, the plate thickness, and the like. Therefore, the bending accuracy can be improved.

In addition, the movement amount adjuster should be used to adjust the continuous upward movement amount of the movable part when bending upward and the downward continuous movement amount of the movable part when bending downward. Therefore, especially when the bending direction is changed and the plate material is bent, the working efficiency is further improved.

Further, since the movement amount adjusting device is provided with the control motor which enables fine adjustment, the bending accuracy is further improved.

[Brief description of drawings]

FIG. 1 is a front view of a plate bending machine according to the present invention. FIG. 2 is a plan view of the same. FIG. 3 is an enlarged sectional view taken along the line III-III in FIG. 1 and shows only the main part. FIG. 4 is an enlarged detailed view of an arrow IV portion in FIG.
A partial cross section is shown. FIG. 5 is a side view as seen from the left in FIG. 3 …… Fixed frame, 9 …… Lower plate 31 …… Upper plate, 5 …… Elevating frame, 71 …… Lower bending die 73 …… Upper bending die, 77 …… Bending die frame 89 …… Bending drive, 117,123 ...... Actuating rack rod 129,131 ...... Control valve, 127 ...... Slide plate

Claims (1)

[Claims] 1. A lower plate 9 is fixedly provided on a fixed frame 3,
The upper plate 31 for clamping and fixing the plate material W in cooperation with the lower plate 9,
It is provided on the vertically movable frame 5, and the lower plate 9 and the upper plate are
A bending die frame 77 provided with a lower bending die 71 and an upper bending die 73 for vertically bending the end edge portion of the plate material W clamped and fixed by 31 in the up and down direction. In order to move the bending die frame 77 in the vertical direction, the bending driving device 89 is provided with a movable portion 91 that can move in the vertical direction, and the movable portion 91 is connected to the bending die frame 77. , The amount of continuous movement of the movable portion 91 in the upward direction when the edge portion of the plate material W is bent upward,
A moving amount adjusting device for simultaneously adjusting the downward moving amount of the movable portion 91 when the end edge portion of the moving portion is bent downward is provided, and the moving amount adjusting device enables a fine adjustment. A plate material bending machine characterized by comprising: