JPS63220928A - Plate stock bending machine - Google Patents

Abstract

PURPOSE:To smoothly perform the turning of the eccentric shaft of a bending die frame by rotating the eccentric shaft via the rotation driving device supported on the separate eccentric shaft from the axis bearing a lift frame, in terms of the bending die frame equipped with upper and lower bending dies. CONSTITUTION:The plate stock W for working is fixed by interposing together with the upper panel 31 provided on a lift frame 5. The plate stock W is fixed by its interposing or its fixing is released by vertically moving the lift frame 5. A bending driving device 89 is composed of a fluid cylinder 91 to rock a bending die frame 77 vertically freely. The rear end edge of the fixed plate stock W is therefore bent in the vertical direction by the upper and lower bending dies 71, 73 at the tip of the frame 77. The bending die frame 77 is pivotally supported freely rockably on the eccentric part 79E of an eccentric shaft 79 separately from an axis 21 to rotate the eccentric shaft 79 by a rotating device. The turning of the bending die frame can thus be performed smoothly.

Description

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

(Prior Art) A bending machine has been developed that bends the edge of a plate material upward or downward into an L-shape. This type of bending machine includes a lower plate that supports a plate, and an upper plate that clamps and fixes the plate to the lower plate. The upper board is attached to an elevating frame that is vertically swingable, and the elevating frame is pivotally supported by a fixed frame via a pivot.

Furthermore, the above-mentioned bending machine is arranged in a vertically opposed manner in order to vertically bend the edge portion of the plate material, which is clamped and fixed to the lower plate and the upper plate, into an L-shape. A bending frame equipped with a lower plate is provided so as to be swingable in the vertical direction.

In the bending machine having the above structure, in order to further simplify the structure, a model has been developed in which the pivot of the lifting frame and the pivot of the bending frame are made common. The bending frame is configured to move in a direction perpendicular to the bending line of the plate in order to press the bent portion of the plate in order to correct springback in the final stage of bending the plate. ing. That is, the bendable frame is pivotally supported on an eccentric portion of the pivot shaft, and is configured so that the displacement is performed by rotating the pivot shaft.

(Problem to be Solved by the Invention) In the above-described configuration, if the plate material is strongly clamped and fixed to the lower plate by the upper plate, the pivot portion of the elevating frame that supports the upper plate will forcefully press the pivot. , there were problems such as making it difficult to rotate the axis.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the conventional problems as described above, the present invention provides a structure in which a plate material can be clamped and fixed in opposition to a lower board fixed to a fixed frame. The upper board is attached to an elevating frame which is supported by a fixed frame via a pivot so as to be able to swing vertically, and the edge of the plate material which is clamped and fixed by the lower board and the upper part A) is vertically moved. A bending die frame is provided with a lower bending die and an upper bending die spaced apart from each other in the vertical direction.
The eccentric shaft is rotatably supported by a fixed frame, and a rotation drive device is provided so as to be swingably supported in the vertical direction on the eccentric portion of the eccentric shaft.

(Function) In the above configuration, when the elevating frame with the upper plate is lowered and the plate material is firmly clamped and fixed by the lower plate and the upper plate, a large force will also be applied to the pivot shaft supporting the elevating frame. . However, the bending die frame with the upper and lower bending dies is pivoted on an eccentric shaft that is separate from the pivot. can be easily carried out.

(Example) Referring to FIGS. 1, 2, and 3, the sheet material bending machine 1 according to the present example includes an elevating frame 5 located above a fixed frame 3 so as to be movable up and down. It is something.

More specifically, the fixed frame 3 has a generally box-like shape, and a lower plate 9 can be appropriately fixed to the upper part of a vertical front plate 7 that constitutes a part of the fixed frame 3. be. The lower board 9 supports the plate material W to be bent, and is provided extending in the left-right direction, as shown in FIG.

0'! As can be understood from FIGS. 2 and 3, the elevating frame 5 has a plurality of arm plates 11 extending in the front-rear direction (in FIG. The upper end of each arm plate 11 is integrally fixed to a temporary holding plate 13 extending in the left and right direction, and the rear end of each arm plate 11 is arranged at appropriate intervals in the left and right direction. The lower end portion is integrally fixed to a connecting plate 15 extending in the left-right direction.

1) In order to support the elevating frame 5 vertically movably with respect to the fixed frame 3, the connecting plate 15 is provided at an appropriate number of locations (
In this embodiment, swing brackets 17 (see FIG. 3) are provided on both left and right sides and the center. The swing bracket 17 has a pivot 2 attached to a substantially clevis-shaped shaft bearing bracket 19 that is erected on the top of the fixed frame 3.
1 is movably supported via 1.

In order to move the minute gap between the bearing part of the swing bracket 17 and the pivot shaft 21 to one side, a fixing part 4423 extending in the left-right direction is provided at the rear of the bearing bracket 19. The swing bracket 17 is placed in the forward direction (the third It is equipped with a bullet 29 such as a concave spring or urethane rubber, which presses leftward in the figure.

With the above configuration, the swinging bracket 17 is always pressed forward by the action of the bullet 29, and the minute gap between the bearing part of the swinging bracket 17 and the pivot 21 is on the front side (the left side in FIG. 3). ) is in a state of being sent to. Therefore, even if the elevating frame 5 receives an external force to the left in FIG. 3, it will not be displaced. Furthermore, with the above configuration, the elevating frame 5 is slidable in the vertical direction about the pivot shaft 21.

The elevating frame 5 is provided with an upper plate 31 in order to clamp and fix the plate +4W to be bent onto the lower plate 9. More specifically, as shown in FIG. 1, the upper board 31 includes a plurality of selectable upper selection boards 33 made of thin plates, and a plurality of block upper boards located on both sides of the selection upper board 33.
It is made of A35 or the like, and its length can be adjusted appropriately according to the width of the plate material W.

Note that the configuration for selecting the number of the selection upper plates 33 and the block upper plates 35 and adjusting the length of the upper plates 31 is not important in this embodiment, and a known mechanism may be adopted as necessary. Since it is also possible to do so, a detailed explanation thereof will be omitted.

In order to support the upper PA 31, an upper plate holder 37 extending in the left-right direction is integrally attached to the lower part of the temporary holding plate 13 provided on the elevating frame 5. A T-slot 39 is formed in the left and right direction. In the lower groove 39, a block upper plate 35 is provided.
A T-shaped protrusion 41 leaking from the upper part is slidably engaged.

With the above configuration, y? By swinging the lower frame 5 up and down, the lower plate 9 and the upper plate 31
The plate material W is clamped and fixed between them, and the fixation is released.

In order to move the elevating frame 5 up and down, the elevating frame 5 is provided with an elevating actuator 43. More specifically, as shown in FIGS. 2 and 3, the elevating frame 5
A support plate 45 is attached to the opposing surface of the arm plate 11, respectively, and each support plate 45
A fluid pressure cylinder 47 as an example of a lifting actuating device 43 is arranged between them. Runions 1 to 49 are provided on both sides of each of the fluid pressure cylinders 470, and the trunnions 49 are supported by bearings 51 attached to each support plate 45. That is, each fluid pressure cylinder 47 is slidably supported by the elevating frame 5.

A piston rod 53 protruding downward from the fluid pressure cylinder 47 is threadedly connected to the upper end of a column 55.

The lower end of the support column 55 is pivotally supported by a bearing 57 attached to the upper part of the fixed frame 3 via five pins.

A stepped portion 61 is formed at the upper end of the pillar 55, and a seat plate 63 fitted to the pillar 55 is supported by the stepped portion 61.

A plurality of adjustment bolts 65 vertically installed on the fluid pressure cylinder 47 are threaded through the seat plate 63.
An adjustment nut 69 is screwed together to adjust the storage force of a bullet 67 such as a book spring or urethane rubber loaded between the two and the lifting amount of the elevating frame 5 by the bullet 67. The ammunition 67 is sufficiently charged to push up the elevating frame 5 and the like.

With the above-described configuration, the elevating frame 5 is swung in the vertical direction by appropriately operating the fluid pressure cylinder 47. Therefore, by raising the elevating frame 5 on the hour, the iIi! Plate material W with positioning device determined
is clamped and fixed to the lower plate 9 by the upper plate 31. Also, by raising the elevating frame 5, the board's
The clamping pressure fixation of UJW will be released. On this occasion,
When the supply of working fluid to the fluid pressure cylinder 47 is stopped and the fluid pressure cylinder 47 is put into a rest state, F?
The descending frame 5 is lifted up slightly by the action of the bullets 67, and the plate material W is released from being clamped.

The plate material W is clamped and fixed by the lower plate 9 and the upper plate 31.
In order to bend the rear end edge upwardly or downwardly into an L-shape, a lower bending die 71 and an upper bending die 73 are provided vertically apart from each other. More specifically, the upper and lower bending molds 7
3.71 is provided extending in the horizontal direction to have approximately the same length as the lower plate 9, and the upper and lower bending molds 73.71 are provided on the lower plate 9.
．． The bending die holder 75 is disposed at a rear position of the upper board 31 and is provided vertically facing each other.

The bending die holder 75 extends in the left-right direction, and the vicinity of both left and right ends and the vicinity of the center of the bending die holder 75 are supported by the front end of a bending die frame 77 that is swingable in the vertical direction. More specifically, as can be understood from FIGS. 2, 3, and 4, the bending frame 77 consists of a pair of left and right rocking plates, and the rear end of the bending frame 77 is rotatably supported by an eccentric portion 79E of an eccentric shaft 79 which is located at approximately the same height as the pivot shaft 21 and rotatably supported by the bearing bracket 19.

The eccentric portion 79E of the &-alignment shaft 9 and the bending frame 77
Means is provided for biasing the bending frame 77 in one direction in order to bias the minute gap between the frame 77 and the pivot portion of the 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, the pull rod 83 extends through the fixing member 23 and is supported so as to be swingable.
A bullet 87, such as a spring or urethane rubber, is loaded between the pull rod 83 and the pull rod 83 in the rearward direction.

As can be understood from the above configuration, the bending frame 77 is vertically swingable around the eccentric portion 79E of the eccentric shaft 79, and is always pulled rearward by the action of the bomb 87. be.

Therefore, the minute gap between the eccentric portion 79E of the eccentric shaft 79 and the pivot portion of the +TFF barbed frame 77 always moves toward the rear.
: In a state of FFr. For bending type frame 7
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 frame 77 will not shift in the slightest.

The bending die frame 77 is provided with a bending drive device 89 in order to vertically swing the bending die frame 77 and bending the rear end edge of the plate 14W by the upper and lower bending dies 71 and 73. More specifically, the bending drive device 8 is composed of a fluid pressure cylinder 91 in this embodiment. This fluid pressure cylinder 91 is swingably supported by the bending frame 77 via a trunnion 93. The lower end of a piston rod 95 (see FIG. 5) protruding downward from this fluid pressure cylinder 91 is attached to a pin 97 attached to a bracket 97 mounted on the fixed frame 3.
It is pivoted via 9.

With the above configuration, the bending die frame 77 can be swung up and down 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 plate 9 and the upper plate 31 can be bent upward by the lower bending die 71 or downward by the upper bending die 73.

As mentioned above, when bending the rear edge of the plate 44W upward or downward, the center of swing of the bending die frame 77 is changed up or down according to the thickness of the plate 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, one side of the fixed frame 3 is provided with, for example, a pulse motor.

A motor 101 capable of forward and reverse rotation, such as a Novo motor, is installed, and a speed reduction device 103 interlocked with the motor 101 is also installed. The output shaft of the reduction gear device 103 is connected to the eccentric shaft 79.

Therefore, by appropriately controlling the rotation of the motor 101, the seven eccentric shafts can be rotated appropriately. That is, by appropriately rotating the eccentric shaft 79, the center of the eccentric portion 79E of the eccentric shaft γ9 is shifted in the vertical and horizontal directions in FIG. Therefore, the swing center of the bending die frame 77 can be adjusted vertically and horizontally in FIG. 3 according to the thickness of the plate material W and the bending direction of the rear end edge of the plate material W. In addition, the bending frame 77 is moved in the front-rear direction (
It can be moved largely in the left-right direction in FIG. 3).

When rotating the eccentric shaft 79 as described above, even if the upper plate 31 firmly clamps and fixes the plate material by the action of the lifting actuator 43, the eccentric shaft 79 is not affected in any way. Therefore, the seven eccentric shafts can be smoothly rotated, and when adjusting the rotational position of the eccentric shaft 79, an appropriate detection device can be added to automatically and accurately determine the rotational position. It is.

With the above configuration, according to this embodiment, when bending the rear edge of the plate material W, the swing center of the bending die frame 77 can be adjusted to any position such as matching the upper surface or the lower surface of the plate material W. . Also, hold the plate W [lower plate 9 in fixed state, upper l! The distance between A31 and the upper and lower bending dies 71 and 73 can be adjusted according to the thickness of the plate material W, allowing more accurate bending. Furthermore, after the sheet material W has been bent, the bending die frame 77 is moved to the left in FIG.
Accordingly, the rear end edge of the plate material W can be bent at a more acute angle to correct springback.

As described above, the bending die frame 77 is swung vertically by the operation of the fluid pressure cylinder 91 to bend the rear end edge of the plate material W. At this time, in order to correct the curvature of the upper and lower bending dies 71, 73 due to the drag force of the plate material W, the operating stroke of each fluid pressure cylinder 91 is individually adjustable.

In other words, as shown at r and TII'I in Figs. Support play 1- extended upward (in Figure 4)
107 is integrally attached.

A pinion shaft 113 having pinions 109 and 111 near both ends thereof is rotatably supported on the fixed plate 105. A vertical rack rod 115 whose upper end is appropriately connected to the fluid pressure cylinder 91 is meshed with one of the binions 109 . Therefore, the pinion shaft 113 is rotated forward and backward in accordance with the vertical movement of the fluid pressure cylinder 91.

A first operating rack rod 117 is engaged with the other pinion 111 of the pinion shaft 113.

The first operating rack rod 117 is slidably supported by a binion support block 119 attached to the side surface of the support plate 107, and meshes with a binion 121 rotatably supported by the binion support block 119. .

The binion support block 119 includes a second actuating rack rod 117 that faces the first actuating rack rod 117 and meshes with the binion 121.
An operating rack rod 123 is movably supported.

Therefore, depending on the vertical movement of the fluid pressure cylinder 91, the first. The second actuating rack rods 117, 123 will move an equal distance in opposite directions.

As shown in detail in FIG.
On the side of 7, there is a 1st. Second working rack rod 117.12
A guide member 125 is attached parallel to the moving direction of No. 3, and a slide plate 127 is movably supported on this guide member 125.

The slide plate 127 has a 1″f1f1 flow cylinder 9.
Control valves 129 and 131 are mounted at symmetrical positions to regulate and control the upward stroke end and the downward stroke end of 1.

The control valves 129 and 131 are pushed into the fluid pressure cylinder 91 when the respective plungers v133 are pushed by one end of each lever 135, 137 which is swingably supported on the slide plate 127. It acts to stop the supply of working fluid. Each of the above operating levers 1
The other end of 35.137 is connected to the first. It is provided opposite one end of the second operating rack rod 117°123.

Therefore, each operating lever 135, 137 acts to suppress the control valve 129, 131 when actuated by the first and second operating rack rods 117, 123.

Note that swing levers 139 and 141 are integrally attached to each of the operating levers 135 and 137, respectively, and the tip of each swing lever 139 and 141 is connected to the slide plate 127.
A plurality of limit switches L S 1 are arranged opposite to each other.
~LS/I. Therefore, the output signals of each limit switch y-LS1 to LS4 cause the first . The second actuating rack rods 117, 123 are the actuating lever 1
It is possible to detect whether or not it has come into contact with 37.139.

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 together. A pulley 147 is attached to one end of this threaded rod 145, and a belt 147 is attached to this pulley 145.
49 is the control motor 1 supported by the support plate 107
It is hung around a drive pulley 153 attached to the drive pulley 51.

With the above configuration, the slide plate 127 is moved along the guide member 125 by appropriately rotating the control motor 151. Therefore, the above-mentioned 1. Second
The ends of the operating rack rods 117, 123 and the operating lever 13
5.137 will be adjusted. In other words, the vertical stroke of the fluid pressure cylinder 91 is adjusted at the same time.

Therefore, among the plurality of fluid pressure cylinders 91 arranged, each fluid pressure cylinder 91 can be Once the controlled stroke end is reached, the upper and lower bending dies 71.7
3 can be arbitrarily curved upward or downward. Therefore, when bending the rear edge of the plate material W, the upper and lower bending dies 7 are bent due to the drag force of the plate material W.
1.73 is curved, so the bend near the center is 1
- 1 tendency can be corrected, and the bending accuracy can be further improved.

In addition, by simultaneously rotating the control units 151 in the same direction by the same rotation amount and simultaneously adjusting the controlled stroke ends in the vertical direction of each fluid pressure cylinder 91, The positions of the upper and lower bending dies 71 and 73 at the end of bending can be adjusted.

After correcting the springback, the upper and lower bending dies 71 and 73 can press and bend the plate material W at the optimum 112 positions, making it possible to effectively correct the springback.

In addition, by individually adjusting the vertical stroke amount of each fluid pressure cylinder 91, even if the upper and lower bending molds are slightly inclined due to assembly errors, for example, they can be made relatively horizontal. can be corrected.

[Effects of the Invention] As can be understood from the description of the embodiments such as "Strike", the gist of the present invention is summarized in the claims. Even if the plate material is strongly clamped and fixed with the plate, no external force is applied to the eccentric shaft supporting the bending frame. Therefore, the eccentric shaft of the bending frame can be smoothly rotated.

That is, when adjusting the rotational center position of the bending frame depending on the thickness of the plate material, the direction of bending, etc., it is possible to easily adjust the initial state of mind.

[Brief explanation of the drawing]

FIG. 1 is a front view of a sheet material bending machine embodying the present invention. The top view shows only the main parts. FIG. 4 is an enlarged detailed view of the portion indicated by the arrow IV in FIG. 2, and is partially shown in cross section. FIG. 5 is a side view of the fourth device as seen from the left direction, partially in section. 3...Fixed frame 9...Lower board 31...Upper board 21...Pivot 5...Elevating frame
71...Lower bending die 73...Upper bending die 77
...Bending frame 79...Eccentric shaft 79E
...-joint 101...motor

Claims (1)

[Claims] An upper plate facing a lower plate fixed to a fixed frame and capable of clamping and fixing a plate material is installed on an elevating frame supported vertically by the fixed frame via a pivot, and the lower plate A bending die frame, which is provided with a lower bending die and an upper bending die separated vertically for bending the edge portion of the plate material clamped and fixed by the upper board and the upper plate, is rotated to the fixed frame. A sheet material bending machine, characterized in that the eccentric shaft is pivotally supported on the eccentric portion of the eccentric shaft supported in a freely movable manner so as to be swingable in the vertical direction, and is provided with a rotation drive device for rotating the eccentric shaft. .