JPH0724865B2 - Plate bending machine - Google Patents

Description

The present invention relates to a plate material bending machine for bending an edge portion of a plate material into an L shape, and more specifically, to an edge of the plate material. The present invention relates to a plate material bending machine capable of continuously bending an edge portion in an up-down direction into an L-shape.

(Prior Art) Japanese Patent Application Laid-Open No. 61-2065 is known as a prior art of a plate bending machine.
There is one disclosed in Japanese Patent Publication No. 25, and the prior art will be briefly described below. The plate bending machine according to this prior art is based on a fixed frame, and an elevating frame that can be moved up and down is provided on the upper front side of this fixed frame. It is provided by stretching in the direction. On the upper part of the fixed frame, a lower plate that clamps and fixes the plate member in cooperation with the upper plate is provided extending in the left-right direction.

Since the upper and lower plates cooperate to bend the edge portions of the plate material clamped and fixed in the upward and downward directions, an eccentric shaft having an eccentric part is rotatably supported at the rear of the fixed frame. A base of a bending die frame, which is provided with a lower bending die and an upper bending die separated from each other in the vertical direction and is swingable in the vertical direction, is pivotally connected to the eccentric portion.

Therefore, by lowering the elevating frame by an appropriate means such as a fluid pressure cylinder, the upper plate is lowered and the plate member is clamped and fixed in cooperation with the lower plate. Then, by swinging the bending die frame upward or downward, the end edge portion of the plate material can be bent upward or downward by the downward bending die or the upward bending die. Furthermore, by rotating the eccentric shaft to move the center of the eccentric part in the forward direction approaching the upper plate (lower plate), the bending die frame is slightly moved in the forward direction, and the lower bending die or the upper bending die is bent. Corrective bending of springback can be performed by the mold.

(Problems to be Solved by the Invention) However, in the plate material bending machine disclosed in Japanese Patent Laid-Open No. 61-206525, the upper plate is provided on an elevating frame provided on the upper front side of the fixed frame so as to be vertically movable. Therefore, it is necessary to avoid the interference with the upper and lower bending molds of the elevating and lowering drive device for elevating and lowering the elevating frame, which cannot be arranged on the rear side of the elevating frame and must be arranged on the front side of the elevating frame. I had to do it. Therefore, the space in front of the elevating frame cannot be effectively used, and it may be difficult to arrange, for example, a bending manipulator at a front position of the elevating frame.

Also, there is a minute gap between the eccentric part of the eccentric shaft and the pivotal support part of the bending die frame, and when the bending die frame is swung upwards or downwards and moved forward, this variation of the minute gaps. However, there is a problem in that the bending accuracy of the plate material deteriorates.

[Structure of the Invention] (Means for Solving Problems) In order to solve the above-mentioned conventional problems, in the present invention, in the rear part of the fixed frame, it is swingable in the vertical direction via a pivot and in the front-back direction. The base part of the rocking frame extended to is pivotally connected, and the upper plate is provided on the lower part of the front side of the rocking frame so as to extend in the left-right direction, and the plate member is provided on the upper part of the front side of the fixed frame in cooperation with the upper plate. An eccentric shaft provided with an eccentric part is provided at the rear part of the fixed frame in order to bend and clamp the lower edge of the plate material that is clamped and fixed in the lateral direction and bend the end edges of the clamped and fixed plate material upward and downward. In addition to being rotatably supported, the eccentric portion is provided with a lower bending die and an upper bending die separated from each other in the vertical direction, and a base of a bending die frame which is vertically swingable is pivotally connected to the eccentric shaft. The eccentric part and the pivot part in the bending frame For lapping a small gap between one direction, characterized by comprising providing a biasing device for biasing the bending tool frame in one direction.

(Operation) With the above configuration, the swing frame is swung downward, and the plate member is clamped and fixed by the upper plate and the lower plate with a large force. Here, a large force also acts on the pivot supporting the swing frame.

Then, by swinging the bendable frame upward with the center position of the eccentric portion on the eccentric shaft as the swing center,
It is possible to bend the end edge portion of the plate material that is clamped and fixed upward by a downward bending die. Further, by swinging the bending die frame downward, the edge portion of the plate material can be bent downward by the upward bending die.

After swinging the bending die frame to bend the edge portion of the plate material, the eccentric shaft is rotated to move the center of the eccentric portion of the eccentric shaft in the forward direction approaching the upper plate (lower plate). As a result, the bending die frame can be slightly moved in the forward direction, and the springback correction bending can be performed by the lower bending die or the upper bending die. At this time, since the pivot shaft supporting the swing frame and the eccentric shaft supporting the bending frame are independent of each other, even if a large force acts on the pivot shaft by clamping and fixing the plate member as described above, this large The influence of the force does not reach the eccentric shaft, and the eccentric shaft can be easily rotated.

When performing the bending work (including the spring back correction bending work) as described above, the action of the biasing device causes the minute gap between the eccentric part of the eccentric shaft and the pivotal support part of the bending die frame to move in one direction. ing.

(Embodiment) Referring to FIG. 1, FIG. 2 and FIG. 3, a plate material folding machine 1 according to the present embodiment has a swing frame 5 vertically extending above and below a fixed frame 3. It is equipped to move freely.

More specifically, the fixed frame 3 is roughly box-shaped, and a lower plate 9 is appropriately fixed to an upper part 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 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 swing frame 5 includes a plurality of arm plates extending in the front-rear direction (vertical direction in FIG. 2, lateral 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 rocking frame 5 so that it can move up and down with respect to the fixed frame 3, rocking brackets 17 (at left and right side portions and a central portion in this embodiment) of the connecting plate 15 are provided. (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 9
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 swing frame 5 receives an external force to the left in FIG. 3, it does not move. Further, with the above configuration, the swing frame 5 is swingable in the vertical direction about the pivot 21.

An upper plate 31 is provided on the swing 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 swing frame 5, and the upper plate holder 37 is attached. A T-shaped groove 39 is formed in the left-right direction on the lower surface of the. 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 swing 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. Become.

In order to move the swing frame 5 up and down, a swing drive device 43 is provided on the swing frame 5. More specifically, as shown in FIGS. 2 and 3, the swing 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 swing drive 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 swing 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.
65 is an adjuster for adjusting the stored force of a bullet 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 rise of the swing frame 5 by the bullet 67. The nut 69 is screwed. The bullet 67 is sufficiently charged to push up the swing frame 5 and the like.

With the above-described configuration, the rocking frame 5 is rocked in the vertical direction by appropriately operating the fluid pressure cylinder 47. Therefore, by lowering the swing 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 lower plate 9 by pressure. Further, by raising the swing frame 5, the clamping fixing of the plate material W is released. At this time, the supply of the working body to the fluid pressure cylinder 47 is stopped, and the fluid pressure cylinder 47
When 47 is put in a resting state, the swing frame 5 is pushed up by a small amount by the action of the bullet 67, and the clamping force fixing of the plate material W is released.

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.

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, an urging device for urging the bending die frame 77 in one direction is provided. In the embodiment, this biasing device is a ball joint described later.
87, pull rod 83, ammunition seat 85, ammunition 87. More specifically, as shown in FIG. 4, a bendable frame
Pull rod at the rear end of 77 via ball joint 81
One end of 83 is pivotally connected. The pull rod 83 is
Although not shown in detail, the pull rod is pierced through the fixing member 23 so as to be swingable, and the pull rod is mounted between the bullet seat 85 attached to the other end of the pull rod 83 and the fixing member 23.
An ammunition 87 is mounted, such as a disc spring or urethane rubber that acts to pull 83 back.

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. ing.

More specifically, the bending drive device 89 is composed of a fluid pressure cylinder 91 in this embodiment. This fluid pressure cylinder 91 has a bending frame 77 through a trunnion 93.
It is supported so that it can swing freely. The lower end of the piston rod 95 (see FIG. 5) protruding downward from the fluid pressure cylinder 91 is a bracket mounted on the fixed frame 3.
It is pivoted to pin 97 through pin 99.

With the above configuration, the bending die frame 77 can be vertically swung by the operation of the fluid pressure cylinder 91. 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 vertically swung by the operation of the fluid pressure cylinder 91 to bend the rear end edge portion 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 drag force of the plate material W,
The working stroke of each fluid pressure cylinder 91 is individually adjustable.

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 fluid pressure cylinder 91 is provided with a rearward direction (upward in FIG. 4). A support plate 107 extending in the direction) is integrally attached. A pinion shaft 113 having pinions 109 and 111 near both ends is rotatably supported by the fixed plate 105. A vertical rack rod 115 having an upper end portion appropriately connected to the fluid pressure cylinder 91 is meshed with the one pinion 109. Therefore, the pinion shaft 113 is normally and reversely rotated according to the vertical movement of the fluid pressure cylinder 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 is meshed with a pinion 121 rotatably supported by the pinion support block 119. The pinion support block 119 has a first
A second operating rack rod 123, which faces the operating rack rod 117 and meshes with the pinion 121, is slidably supported.

Therefore, depending on the vertical movement of the fluid pressure cylinder 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.
On the slide plate 127, control valves 129 and 131 for restricting and controlling the upward stroke end and the downward stroke end of the fluid pressure cylinder 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 the 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
It is provided so as to face one end of the second operating rack rod 117, 123. Therefore, each actuating lever 135, 137 is
When operated by the 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 45 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 fluid pressure cylinder 91
The amount of stroke in the up and down direction 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 bending dies 71, 73 may be configured such that the central portions thereof are arbitrarily curved upward or downward. 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 are bent by the drag force of the plate material W and the bending in the vicinity of the central portion becomes unsatisfactory, and the bending accuracy is 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.

Also, by individually adjusting the stroke amount of each fluid pressure cylinder 91 in the vertical direction, for example, the upper and lower bending dies 71, 7
Even if 3 is slightly inclined due to the assembly error screw, it can be corrected relatively horizontally.

According to the above-described embodiment of the present invention, the base portion of the swing frame 5 which is swingable in the vertical direction and extends in the front-back direction is pivotally connected to the rear portion of the fixed frame 3, and the front side of the swing frame 5 is connected. Since the upper plate 31 is provided in the lower portion so as to extend in the left-right direction, the rocking drive device 43 that rocks the rocking frame 5 to clamp and fix the plate material W by the cooperation of the upper plate 31 and the lower plate 9.
Can be arranged behind the front surface of the swing frame 5 while avoiding interference with the upper and lower bending dies 71, 73. Therefore, the space in front of the swing frame 5 can be effectively used, and for example, a bending manipulator can be easily arranged at the front position of the swing frame 5.

Also, due to the action of the biasing device, the eccentric portion 79 of the eccentric shaft 79
Because the minute gap between E and the pivot of the bending die frame 77 is moved in one direction, the bending die frame 77 is accurately moved up by a predetermined amount without being affected by the force generated during the bending process. It can be swung downward or downward and moved forward. Therefore, the bending accuracy of the plate material W is improved.

Furthermore, since the pivot shaft 21 supporting the swing frame 5 and the eccentric shaft 79 supporting the bending frame 77 are separate and independent, the upper board
Even if a large force acts on the pivot shaft 21 by clamping and fixing the plate material W by the cooperation of 31 and the lower plate 9, the large force does not affect the eccentric shaft 79, and the eccentric shaft 79 is easily rotated. Can be moved. Therefore, the correction bending of the spring back can be performed more appropriately, and the bending accuracy is further improved.

[Effects of the Invention] As can be understood from the above description of the embodiments, according to the present invention, the base of the swing frame that is swingable in the vertical direction and extended in the front-back direction is pivotally connected to the rear portion of the fixed frame. Since the upper plate is provided in the lower part of the front side of the swing frame so as to extend in the left-right direction, the swing frame swings so as to clamp and fix the plate material by the cooperation of the upper plate and the lower plate. The drive device can be arranged behind the front surface of the swing frame while avoiding interference with the upper and lower bending dies. Therefore, the space in front of the rocking frame can be effectively used, and for example, the bending manipulator can be easily arranged at the front position of the rocking frame.

In addition, since the minute gap between the eccentric portion of the eccentric shaft and the pivotal support portion of the bending die frame is moved in one direction by the action of the urging device, it is not affected by the force generated during bending, The bendable frame can be accurately swung upward or downward and moved forward by a predetermined amount. Therefore, the bending accuracy of the plate material is improved.

Furthermore, since the pivot that supports the swing frame and the eccentric shaft that supports the bendable frame are independent, a large force acts on the pivot by clamping and fixing the plate material by the cooperation of the upper and lower plates. However, the influence of this large force does not reach the eccentric shaft, and the eccentric shaft can be easily rotated. Therefore, the correction bending of the spring back can be performed more appropriately, and 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 fourth left side and is shown with a partial cross section. 3 …… Fixed frame, 5 …… Swing frame 9 …… Lower panel, 21 …… Pivot 31 …… Upper panel, 71 …… Lower bending die 73 …… Upper bending die, 77 …… Bending die frame 79 …… Eccentric shaft, 79E …… Eccentric part 101 …… Motor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-206525 (JP, A) Actually opened 61-152325 (JP, U) Actually opened 61-152326 (JP, U) JP-B Sho-60- 31570 (JP, B2) Actual public 6-18648 (JP, Y2) Actual public 56-6180 (JP, Y2)

Claims (1)

[Claims] 1. A rear portion of a fixed frame is pivotably connected to a base portion of a swing frame which is swingable in the vertical direction and extends in the front-rear direction via a pivot, and an upper plate is laterally connected to a lower front portion of the swing frame. The lower plate that clamps and fixes the plate material in cooperation with the upper plate is provided on the upper front side of the fixed frame and extends in the left-right direction, and the edge portion of the plate member that is clamped and fixed is set upward. In order to bend in the downward and downward directions, an eccentric shaft having an eccentric portion is rotatably supported at the rear portion of the fixed frame, and the eccentric portion is provided with a lower bending die and an upper bending die separated from each other in the vertical direction. In addition, the base of the bending die frame, which is swingable in the vertical direction, is pivotally connected, and in order to bring a minute gap between the eccentric portion of the eccentric shaft and the pivoting portion of the bending die frame in one direction, the bending die frame is formed. Is provided with a biasing device that biases the Plate bending machine characterized and.