JPH01289512A - Bending machine for sheet - Google Patents

Abstract

PURPOSE:To enable bending the open end part of the sheet with excellent accuracy by providing a middle bending die consisting of a number of sequential split dies movably upward and downward and providing the split dies movable between a bending operating position and bend evading position. CONSTITUTION:When proper number of the split dies 75 are moved from the bend operating position to the bend evading position by operating an air cylinder, the engaging part 83a is opened and when the middle bending work is performed, the edge part 75a is engaged with the engaging part 83a. Therefore, the transition from the bend operating position to the bend rotating position of the proper number of split dies 75 is performed smoothly and the accurate bending work is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Industrial Application Field) The present invention relates to a sheet material bending machine, and more specifically, a method for bending a sheet material according to the bending length of the opening edge of the sheet material. This invention relates to a sheet material bending machine that can be bent.

(Prior Art) A plate bending machine for bending the edge of a plate both upward and downward is known.

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There is. In addition, the sheet material bending machine vertically connects a lower bending die and an upper bending die for bending the edge of the plate material W protruding from between the lower plate and the upper plate upwardly or downwardly. It is comprised of bendable beams that are spaced apart and opposed to each other and are swingable in the vertical direction.

However, conventionally, there has been no dedicated plate bending machine for bending the opening edge of the plate W, for example, upwards as shown in FIG. The edges were bent as shown in Figure 7.

(Problem to be Solved by the Invention) Therefore, since the operator manually bent the opening edge of the plate material W, it is difficult for an unskilled worker to precisely bend the opening edge of the plate material W. The problem was that it couldn't be done.

SUMMARY OF THE INVENTION Therefore, in order to solve the above-mentioned problems, it is an object of the present invention to provide a sheet material bending machine equipped with a middle bending die for bending the opening edge of the sheet material W.

[Configuration of the Invention (Means for Solving Problem In order to bend the opening edge of the plate material protruding from between the lower panel, a middle bending die consisting of a number of consecutively arranged split dies is provided that can be moved vertically, and the split dies are placed in a bending action position and a bending avoidance position. It is movable between the two.

(Function) In the above configuration, after the plate material is clamped and fixed in cooperation with the lower plate and the upper plate, the split die corresponding to the bending length of the opening edge of the plate material is moved to the bending position. Then, by moving the middle bending die upward or downward, the opening edge of the plate material is bent.

(Example) Referring to FIGS. 1, 2, and 3, the sheet material bending machine 1 according to the present example has a substantially box-shaped lifting frame 5 positioned above a fixed frame 3 in the vertical direction. The fixed frame 3 and the elevating frame 5 are connected to side frames 7 erected on the left and right sides.

More specifically, the fixed frame 3 has a box-like shape in a circular direction, and the vertical front plate 9, which constitutes a part of the fixed frame 3, has a vertical front plate 9 on the top of which is arranged in the left and right direction (see FIGS.
Towards the right in the diagram. In FIG. 3, a lower plate 11 extending in the mounting direction toward the paper surface is appropriately fixed and provided. The lower plate 11 supports the plate material W to be subjected to upward bending, downward bending, and middle bending.

In order to make the elevating frame 5 swingable in the vertical direction, a third
Cylinder bracket 1 roughly shaped like a clevis as shown in the figure
3, a lifting cylinder 15 is provided. A piston rod 17 that can freely protrude downward from the lifting cylinder 15 is swingably supported by the side frame 7 via a hinge pin 19.

With the above configuration, the elevating frame 5 swings upward about the hinge bin 12 by appropriately operating the elevating cylinder 15.

An arm plate 23 is attached to a plurality of roughly clevis-shaped swing brackets 21 provided on the rear lower surface of the elevating frame 5.
is fixedly provided. A presser plate 25 extending in the left-right direction is provided at the tip of each of these arm plates 23, and a plate material W supported by the lower plate 11 is fixed under pressure on the lower side of the presser plate 25. An upper board 27 is provided for this purpose.

Note that the upper board 27 is provided extending in the left-right direction.

With the above configuration, by vertically swinging the elevating frame 5 around the hinge bin 12, the plate material is clamped and fixed between the lower plate 11 and the upper plate 27, and the fixation is released.

Here, as shown in FIG. 1, the upper board 27 includes a plurality of selectable upper M29 made of thin plates and a plurality of optional upper W2.
It is made up of a plurality of block tops M31 etc. located on both sides of the plate material W, and is configured so that its length can be adjusted as appropriate in accordance with the width of the plate material W.

In addition, for the configuration for adjusting the length of the upper board 27 by selecting the above-mentioned selection 511129 and the number of block upper boards 31, it is possible to adopt a known mechanism if necessary, so the details will be explained below. omitted.

In order to bend downward the edge of the plate material W which is clamped and fixed by the lower plate 11 and the upper plate 27, an upper bending mold 33 is provided extending in the left-right direction to the same length as the lower plate 11. .

More specifically, as shown in FIGS. 3 and 4, a rotatable first eccentric shaft 35 is supported on the plurality of swing brackets 21, and a rotatable first eccentric shaft 35 is formed on the first eccentric shaft 35. A swingable upper bending beam 37 is supported on each of the plurality of eccentric parts 35E. At the tips of the plurality of upper bending domes 37 (the left end in FIG. 3), there is provided an upper bending mold holder 39 that is provided with an upper bending mold 33 and extends in the left-right direction.

Incidentally, in order to bring the minute gap between the eccentric portion 35E of the first eccentric shaft 35 and the pivot portion of the upper bending arm 37 toward the rear, for example, an upper bending beam is provided at an appropriate position of the upper bending beam 37. A known biasing means 41 is provided for biasing 37 in the rearward direction.

As understood from the above configuration, the upper bending beam 37 is
It is freely swingable in the vertical direction about the eccentric portion 35E of the first eccentric shaft 35. Moreover, since the upper bending beam 37 is always pulled backward, the upper bending beam 37 will not move even if an external force acts in the rearward direction.

In order to swing the upper bending die holder 39 downward and bending the edge of the plate material by the upper bending die 35, the lifting frame 5 is provided with a horizontal direction as shown in FIG. A plurality of upward bending cylinders 43 are provided. More specifically, as shown in FIG. 3, the upper bending cylinder 43 is swingably supported by the lifting frame 5, and the lower end of the piston rod 45 that projects downward from the upper bending cylinder 43 is It is pivotally supported by a bracket 47 attached to the upper bending type holder 39 via a pin (not shown).

With the above configuration, the upper bending mold holder 39 can be swung up and down by appropriately operating the upper bending cylinder 43. Therefore, the edge of the plate material W clamped and fixed between the lower plate 1111 and the upper plate 27 can be bent downward by the upper bending die 33.

As shown in FIG. 1, a bending angle adjustment device RA51 is provided at an appropriate position on the lifting frame 5 for adjusting the bending angle by adjusting the stroke of the upper bending cylinder 43.
is the provision.

A lower bending die 53 extending in the left-right direction is provided below the upper bending die 33 in order to bend the edge of the plate material W which has been clamped and fixed upward.

More specifically, the support plate 55 of the fixed frame 3 is provided with a plurality of roughly clevis-shaped fixing brackets 57, as shown in FIGS. 3 and 4. A rotatable second eccentric shaft 59 is supported on the plurality of fixed brackets 57, and a plurality of eccentric parts 59E formed on the second eccentric shaft 59 each have a swingable lower bending beam 6.
1 is supported. A lower bending mold holder 63 having a lower bending mold 53 and extending in the left-right direction is provided at the front end of the plurality of lower bending beams 61. Further, a known urging means 65 for urging the lower bending beam 61 in the rearward direction is provided.

In order to swing the lower bending die holder 63 upward and bending the edge of the plate material W by the lower bending die 53, the support plate 55 has an appropriate number of downward bending plates extending in the left and right direction. A cylinder 67 is provided.

More specifically, the lower bending cylinder 67 is connected to the support plate 5.
5 is swingably supported by a lower bending cylinder 67.
The upper end of the piston rod 69 that protrudes upward from the bottom is connected to the bin 73 by a bracket 71 attached to the lower bending type holder 63.
It is pivotally supported through.

With the above configuration, by appropriately operating the lower bending cylinder 67, the lower bending die holder 63 is swung in the vertical direction, and the edge of the plate material can be bent upward.

A bending angle adjustment device (not shown) is provided at an appropriate position to adjust the stroke of the lower bending cylinder 67 to adjust the bending angle.

In order to bend the opening edge of the plate material W, which is clamped and fixed by the lower plate 11 and the upper plate 27, for example upward, as shown in FIG. A mold 77 is provided extending in the left-right direction as shown in FIG.

More specifically, as shown in FIGS. 3 and 4, a rotatable third eccentric shaft 79 is supported on the fixed bracket 57, and a plurality of shafts formed on the third eccentric shaft 79 are supported. Each of the eccentric portions 79E supports a swingable medium bending beam 81. A swing plate 83 having a middle bending die 77 is provided at the front end of the plurality of middle bending beams 81 .

The swinging plate 83 is swung upward, and the middle bending die 7
7, the front plate 9 of the fixed frame 3 is provided with a middle bending cylinder 8 extending in the left and right direction, as shown in FIG.
5 is a provision.

More specifically, the middle bending cylinder 85 is swingably supported by the front plate 9.
The upper end of the piston rod 87 that protrudes upward from the
It is pivotally supported by a bracket (not shown) attached to the lower surface of the swing plate 83 via a pin (not shown).

With the above configuration, by appropriately operating the middle bending cylinder 85, the swinging plate 83 is swung up and down,
The opening edge of the plate material W can be bent upward.

As shown in FIG. 1, a bending angle adjustment device 89 is provided at an appropriate position on the front plate 9 to adjust the stroke of the middle bending cylinder 85 to adjust the bending angle.

As described above, when the edge of the plate material W is bent upward or downward, or when the opening edge of the plate material W is bent upward, the upper bending beam 37. Lower bending beam 61. A clearance adjustment device 91 is provided to move the center of swing of the middle bending beam 81 back and forth according to the thickness of the plate material W.

More specifically, referring to FIG. 4, a motor 93 capable of forward and reverse rotation, such as a pulse motor or a servo motor, is attached to the rear part of the fixed frame 3 (the front side when facing the paper in FIG. 4). In addition, a deceleration device 95 is attached which is interlocked with the motor 93 via a belt 94. The output shaft of this speed reduction device 95 is interlocked and connected to the second Q center shaft 59. A first eccentric shaft 59 is located at an appropriate position on this second eccentric shaft 59. A second drive gear 97,99 is fixedly provided. First eccentric shaft 35
At an appropriate position, there is a first drive tooth jli97 that meshes with the first drive tooth jli97.
A driven gear 101 is fixedly provided, and a second driven gear 103 that meshes with the second drive gear 99 is also fixedly provided at an appropriate position on the third eccentric shaft 79.

Therefore, by appropriately controlling the rotation of the motor 93, the second eccentric shaft 59 is rotated appropriately, and the first eccentric shaft 59 is rotated in conjunction with the second eccentric shaft 59. The third eccentric shaft 35.79 will be rotated appropriately. That is, 1st degree, 2nd degree. Eccentric part 3 of the third eccentric shaft
5E, 59E, and 79E can be moved back and forth at the same time, and the upper bending beam 37. Lower bending beam 61. The middle bending beam 81 can be moved back and forth at the same time.

With the above configuration, according to this embodiment, the lower board 11. Up! JI27 and upper bending die 33. Lower bending mold 53. This means that the interval with the middle bent piece 77 can be adjusted at the same time according to the thickness of the plate material W. Furthermore, after the bending of the plate material W is completed, the motor 93 is operated appropriately to bend the upper bending beam 37. By moving the lower bending beam 61 forward, the edges of the plate material W can be bent at a more acute angle to correct springback.

Referring to FIGS. 5 and 6, the middle bending die 77 is rotatably supported by the swing plate 83.

More specifically, the fixed bracket 10 is attached to the swing plate 83.
4. The swinging member 106 attached via the bin 105 has
A rotatable medium bending shaft 107 is provided, and this medium bending shaft 107 has a large number of rotatable split molds 75.
A medium bending die 77 made of the above is fitted.

The split mold 75 has a stopper portion 75 on the annular base 75a.
b is formed, and a protruding portion 75d having an edge portion 75C is formed to protrude substantially in the tangential direction.

With the above configuration, the split mold 75 has a stopper portion 75, for example.
b is in contact with a stopper member 109 provided on the swing plate 83 extending in the left-right direction in FIG. 5 (in the left-right direction in FIG. This allows the edge portion 75c to move between the position where it engages with the engaging portion 83a of the swing plate 83 (bending action position).

In order to move an appropriate number of divided molds 75 between the bending action position and the bending avoidance position, a mold switching device 113 is provided on the base block 111 provided on the swing plate 83. In this embodiment, as shown in FIG. 1, two mold changing devices 113 are provided on the left and right sides.

More specifically, a pair of 13 movement members 119 and 121 are integrally attached to each of the swing shafts 115 and 117 on the left and right sides, which are rotatably supported on the base block 111.
The left and right swinging members 119 and 121 have a cutting plate 12 that is rotatable via hinge bins 123 and 125, respectively.
7 is a provision.

This switching plate 127 is provided with an arm member 131 via a swing shaft 129, and an arm shaft 133 attached to the tip of the arm member 131 is rotatable by contacting an appropriate number of split molds 75. A cylindrical roller 135 is provided.

In order to swing the swinging members 119 and 121 through the swing shafts 115° and 117, the base block 111 is provided with an air cylinder 137 via a cylinder bracket (not shown). Moving axis 115.117
A rack member 143 is provided which engages with binions 139 and 141 which are integrally attached to the rack member 143, respectively, and is movable up and down.

Here, the piston rod 145 that can freely protrude downward from the air cylinder 137 and the rack member 143 are connected.

Additionally, a bracket (not shown) is attached to the switching plate 127.
An air cylinder 147 is provided through the air cylinder 147, and the tip of a piston rod 149 that can freely protrude from the air cylinder 147 is connected to the end of the arm member 131.

With the above configuration, by appropriately operating the air cylinder 137, the rack member 143 is guided by a rack guide (not shown) and moves up and down, and also swings in conjunction with the rotation of the binions 139 and 141. Moving member 119.12
1 rotates around a swing axis 115°117. Therefore, the row 5135 provided on the arm member 131 supports the air cylinder 147 while supporting an appropriate number of split molds 75.
By appropriately operating the split molds 75, an appropriate number of split molds 75 can be moved between the bending action position and the bending avoidance position.

In addition, in this embodiment, the length between the center of the middle bending shaft 107 and the center of the arm shaft 133 and the swing axis 11 are
5 and the center of the hinge bin 123, the swing axis 1
17 and the center of the hinge bin 125 are made equal to each other, when the air cylinder 137 is operated appropriately, the switching plate 123 can move in parallel without swinging, and in this case, the switching plate 123 can move in parallel without swinging. La 135
can be brought into contact with an appropriate number of divided molds 75.

In order to engage and release the edge portion 75c of the split mold 75 with the engaging portion 83a of the swing plate 83,
The swinging member 106 is configured to be swingable via the bin 105. More specifically, the tip of a piston rod (not shown) that can freely protrude rearward from the air cylinder 151 that is swingably attached to the swinging member 106 (backward in FIG. It is screwed into the plate 83 at an appropriate position.

With the above configuration, when moving an appropriate number of split molds 75 from the bending action position to the bending avoidance position by appropriately operating the air cylinder 151, the edge portion 75c and the engaging portion 83a
When performing the middle bending process, the edge portion 75c and the engaging portion 83a are engaged with each other. therefore,
It is possible to smoothly move an appropriate number of divided molds 75 from the bending action position to the bending rotation position, and to perform medium bending with high precision.

In order to select an appropriate number of split molds 75 to be moved between the bending action position and the bending avoidance position according to the bending length of the plate material W, the base block 111 is equipped with a mold switching device 1113. It is configured to be movable left and right.

More specifically, on the rear surface (right side in FIG. 1) of the base block 111, there is a running portion 111 guided by a guide 155 provided on the swing plate 83 and extending in the left-right direction.
A is formed, and a roller 157 that is rotatable in contact with the swing plate 83 is attached.

Further, the base block 111 is provided with a nut member (not shown) in order to be screwed into a ball screw 161 rotatably supported by the swing plate 83 via a support bracket 159. The ball screw 161 is connected to the belt 16
3. It is movably connected to the rotating shaft of a servo motor 169 attached to the swing plate 83 through a transmission means of pinions 165 and 167.

With the above configuration, by appropriately operating the servo motor 169, the base block 111 equipped with the mold switching device 113 can be moved in the left-right direction (left-right direction in FIG. 5, front-back direction in FIG. 6). The split die 75 can be selected to move between the bending action position and the bending avoidance position. A sensor core 0, such as a proximity sensor, is provided at an appropriate position on the swing plate 83, and detects that the base block 111 has moved to the left or right to its maximum extent.

A centering adjustment device is provided to position the centers of the selected appropriate number of divided molds 75 at the center of the sheet material bending machine 1. More specifically, in this embodiment, the centering adjustment device is an air cylinder 171 provided on the right swinging member 105;
The tip of the piston rod 173 that protrudes from is screwed into the bending shaft 107.

With the above configuration, centering can be adjusted by appropriately operating the air cylinder 171 to move the split mold 75 to the left.

In the above configuration, in this embodiment, the lifting cylinder 15 is appropriately operated to clamp and fix the plate material W between the upper plate 27 and the lower plate 11, and the clearance is adjusted according to the plate material W. When bending the plate material W downward, the upper bending cylinder 43 is appropriately operated, and when bending the plate material W upward, the lower bending cylinder 67 is appropriately operated. Furthermore, when bending the opening edge of the plate material W, an appropriate number of split molds 75 to be used for the middle bending process are selected according to the bending length of the plate material W, and the cylinder 85 for middle bending is appropriately adjusted. Operate to perform medium bending.

According to this embodiment as described above, upward bending, downward bending, and middle bending can be performed with high accuracy using one sheet material bending machine 1.

Also, the clearance adjustment device 91 controls the lower plate 11, the upper plate 27, and the upper bending die 33. Lower bending die 53° Middle bending die 77
Since the clearance can be adjusted at the same time according to the thickness of the plate material W, the hassle of having to adjust the clearance every time the bending process changes can be avoided.

Conventionally, the upper bending die 33 and the lower bending die 53 were provided on one bending beam, but by providing them on the upper bending beam 37 and the lower bending beam 61, respectively, the plate material bending machine 1
The depth of the plate is increased, and even a long plate material W can be easily bent.

Furthermore, by making the elevating frame 5 swingable in the vertical direction, the plate material bending machine 1 can be easily cleaned.

Note that the present invention is not limited to the above-described embodiments, and can be implemented in various other embodiments by making appropriate changes.

[Effects of the Invention] As can be understood from the above description of the embodiments, the opening edge of a plate can be bent using a plate bending machine equipped with a medium bending die as a dedicated machine. , the opening edge of the plate material can be bent with high precision without the need of a skilled worker. Furthermore, since the above-mentioned medium bending die is composed of a large number of consecutively arranged divided dies, it is possible to appropriately select the divided dies used for the medium bending according to the bending length.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of a sheet material bending machine. FIG. 2 is a plan view of the same. FIG. 3 is a sectional view taken along the line ■-■ in FIG. 1. FIG. 4 shows a clearance adjustment device according to this embodiment. FIG. 5 is an enlarged detailed view of the arrow V portion in FIG. 1, with a portion partially cut away. Figure 6 is an enlarged detailed view of the arrow Vi in Figure 1.
This is a partial cross section. FIG. 7 is an explanatory diagram of a plate material that has been subjected to medium bending. 1...Plate bending machine

Claims (1)

[Claims] An upper plate is provided to clamp and fix the plate material in cooperation with a lower plate that supports the plate material, and a number of divided type parts are connected in series in order to bend the opening edge of the plate material that protrudes from between the upper plate and the lower plate. 1. A sheet material bending machine, characterized in that a middle bending die made of the following is provided so as to be movable up and down, and the split die is provided so as to be freely movable between a bending action position and a bending avoidance position.