JPH0654418U - Bending angle correction device for plate bending machine - Google Patents

Abstract

(57) [Abstract] [Purpose] Improve the accuracy of the bending angle by changing the pressing force applied to the upper split mold by adjusting a plurality of pressing members provided in the upper split mold in a plate bending machine. . [Structure] Elevating cylinders 15a, 15b, 15 arranged at a plurality of positions which are pressing members acting on the upper split mold 19.
The pressing force of c can be adjusted, and the pressing force of the upper split mold 19 for fixing the plate material in cooperation with the lower mold 11 can be adjusted. Therefore, when the plate material W placed on the lower mold 11 is clamped and fixed by the upper split mold 19 and the plate material is bent, the pressing force acting on the upper split mold 11 and the plate By increasing the width center and gradually lowering it outward, it is possible to prevent the width center of the plate from becoming loose during bending and improve the accuracy of the bending angle.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bending angle correction device for a plate bending machine.

[0002]

[Prior art]

 Conventionally, in order to bend a plate material with a plate material bending machine, a pressing force is applied to the upper split mold by using a fluid pressure operated cylinder as a drive source, and the plate material is pressed in cooperation with the lower mold. It is pressed and bent. At this time, the pressing force applied to the upper split mold was constant.

[0003]

[Problems to be solved by the device]

 In the conventional plate bending machine described above, the pressing force applied to the upper split mold is constant in the direction of the plate even if the material of the plate or the thickness of the plate changes. However, since bending is elastic, there is a problem that the bending angle at the center of the plate width of the plate material is inevitably weakened when bending is performed, and the bending accuracy cannot be improved.

Therefore, the present invention provides a bending angle correction device for a plate material bending machine in which the pressing force of the upper split mold is individually adjustable in the plate width direction to improve the bending accuracy of the product. The purpose is to do.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a plate material bending machine equipped with an upper split mold that cooperates with a lower mold that supports a plate material, and clamps and fixes the plate material. A plurality of pressing members that act on the mold are provided, and the pressing force of each pressing member is adjustable so that a bending angle correction device for a plate bending machine is configured.

[0006]

[Advantage] By adopting the bending angle correction device of the plate material bending machine of the present invention, the pressing force of the upper divided mold for clamping the plate material in cooperation with the lower mold is fixed. It can be adjusted individually by the pressing force of the members. For example, when five pressing members are provided in the plate width direction and a pressing force is applied to the upper split mold, the pressing force of the pressing member located at the center of the plate width is maximized and the pressing force of the pressing members on both sides is maximized. Is set slightly lower, and the pressing force of the pressing members on both sides is set lower.

Therefore, the bending angle of the plate material is corrected by correcting the bending angle of the plate material by responding to the bending of the plate material due to the change of the material of the plate material to be handled, the plate thickness, etc. Bending accuracy can be improved.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIGS. 5 and 6, the plate material bending machine 1 is provided with a substantially box-shaped frame 5 at a position above the fixed frame 3, and the fixed frame 3 and the frame 5 are arranged to the left and right. It is connected to the standing side frame 7.

More specifically, the fixed frame 3 is roughly box-shaped, and a vertical front plate 9 forming a part of the fixed frame 3 has an upper portion in the left-right direction (see FIG. 5). In FIG. 6, a lower mold 11 extending in the left-right direction, the front-back direction toward the paper surface in FIG. 6) is appropriately fixed and provided. The lower mold 11 supports a plate material W to be subjected to upward bending, downward bending, and middle bending.

An elevating cylinder 15 is provided on the frame 5 via a cylinder bracket 13. A piston rod 17 which is capable of projecting downward from the lifting cylinder 15 is connected through a clevis 23 as well as a support member 21 for supporting an upper split mold 19 provided facing the lower mold 11.

With the above structure, the upper split mold 19 moves up and down by appropriately adopting the lift cylinder 15, and the plate material W supported on the lower mold 11 is clamped and fixed by the upper split mold 19. In addition, the fixation will be released.

A plurality of generally clevis-shaped brackets 25 provided on the lower surface of the rear side of the frame 5 are provided with hinge pins 29 for rotatably supporting a swing arm 27. The hinge pin 29 in place is an eccentric shaft 31. Further, as a drive member for driving the eccentric shaft 31, a cylinder 35 having a plurality of stages, for example, three stages of varying strokes is provided between the lever 33 locked to the shaft end of the eccentric shaft 31 and the frame 5. ing.

With the above structure, the eccentric shaft 31 is rotated by appropriately operating the cylinder 35, and the upper split mold 19 can be bent via the swing arm 27. One end of the swing arm 27 is fixed to the support member 21.

As shown in FIG. 5, the upper split mold 19 includes a plurality of selectable upper plates 37 made of thin plates and a plurality of block upper plates 39 located on both sides of the selected upper plates 37. The length of the plate material W is appropriately adjustable in accordance with the width of the plate material W.

A known mechanism can be adopted as the structure for adjusting the length of the upper split mold 19 by selecting the number of the selection upper plates 37 or the block upper plates 39. Therefore, detailed description thereof will be omitted.

In order to bend the edge of the plate material W clamped and fixed by the lower mold 11 and the upper split mold 19 in the downward direction, the upper bending mold 41 has the same length as the lower mold 11 in the left-right direction. It has been extended to.

More specifically, as shown in FIG. 6, a rotatable first eccentric shaft 43 is supported by the plurality of brackets 25, and a plurality of eccentric shafts formed on the first eccentric shaft 43 are supported. The upper bending beam 45, which is swingable, is supported on each of the portions 43E. An upper bending die holder 47 having an upper bending die 41 and extending in the left-right direction is provided at the tip portions (the left end portions in FIG. 6) of the plurality of upper bending beams 45.

It is to be noted that, in order to bring a minute gap between the eccentric portion 43E of the first eccentric shaft 43 and the pivotal support portion of the upper bending beam 45 toward, for example, the rear direction, the upper bending beam 45 is appropriately positioned. Known biasing means 49 for biasing 45 in the rearward direction is provided.

As can be understood from the above configuration, the upward bending beam 45 is vertically swingable about the eccentric portion 43E of the first eccentric shaft 43. Moreover, since the upward bending beam 45 is always pulled backward and then backward, the upward bending beam 45 does not move slightly even if an external force acts in the backward direction. .

In order to swing the upper bending die holder 47 downward and bend the edge of the plate material by the upper bending die 41, the frame 5 extends in the left-right direction as shown in FIG. Therefore, a plurality of upward bending cylinders 51 are provided. More specifically, the upper bending cylinder 51 is supported by the frame 5, and the lower end portion of the piston rod 53 protruding downward from the upper bending cylinder 51 has a bracket 55 attached to the upper bending die holder 47. Is pivoted through a pin (not shown).

With the above configuration, the upper bending die holder 47 can be vertically swung by appropriately operating the upper bending cylinder 51. Therefore, the edge of the plate material W clamped and fixed between the lower mold 11 and the upper split mold 19 can be bent downward by the upper bending mold 41.

As shown in FIG. 5, a bending angle adjusting device 57 for adjusting the bending angle by adjusting the stroke of the upward bending cylinder 51 is provided at an appropriate position of the frame 5. .

In order to bend the edge portion of the plate material W fixed by clamping in an upward direction, a downward bending die 59 extending in the left-right direction is provided below the upper bending die 41.

More specifically, the support plate 61 of the fixed frame 3 is provided with a plurality of substantially clevis-shaped fixed brackets 63 as shown in FIG. A rotatable second eccentric shaft 65 is supported by the plurality of fixing brackets 63, and a plurality of eccentric portions 65E formed on the second eccentric shaft 65 are respectively swingable downward bending beads. Mu 67 is supported. At the front ends of the plurality of downward bending beams 67, a downward bending mold holder 69 having a downward bending mold 59 and extending in the left-right direction is provided. Further, a known urging means 71 for urging the downward bending beam 67 in the rearward direction is provided.

In order to swing the lower bending holder 69 upward and bend the edge portion of the plate material W by the lower bending die 59, the supporting plate 61 has a proper number of downward bending in the left-right direction. A bending cylinder 73 is provided.

More specifically, the lower bending cylinder 73 is swingably supported by the support plate 61, and the upper end portion of the piston rod 75 projecting upward from the lower bending cylinder 73 has a lower bending die holder. It is pivotally supported via a pin 79 on a bracket 77 attached to 69.

With the above configuration, by properly operating the downward bending cylinder 73, the downward bending die holder 69 is swung in the vertical direction, and the edge portion of the plate material can be bent upward.

A bending angle adjusting device (not shown) for adjusting the bending angle by adjusting the stroke of the downward bending cylinder 73 is provided at an appropriate position.

For bending the opening edge portion of the plate material W clamped and fixed by the lower die 11 and the upper split die 19 in an upward direction, for example, a middle bend made up of a plurality of split dies 81 connected to each other. A mold 83 is provided extending in the vertical direction as shown in FIG.

More specifically, as shown in FIGS. 5 and 6, a third eccentric shaft 85, which is rotatable, is supported by the fixed bracket 63, and is formed on the third eccentric shaft 85. A swingable center bending beam 87 is supported on each of the plurality of eccentric portions 85E. A swing plate 89 having a center bending die 83 is provided at the front ends of the plurality of center bending beams 87.

In order to bend the swing plate 89 upward and bend the opening edge portion of the plate material W by the middle bending die 83, the front plate 9 of the fixed frame 3 has the structure shown in FIG. As shown, a middle bending cylinder 91 is provided in the up-down direction.

More specifically, the center bending cylinder 91 is swingably supported by the front plate 9, and the upper end of the piston rod 93 protruding upward from the center bending cylinder 91 has a swing plate 89. It is pivotally supported by a pin (not shown) on a placket (not shown) attached to the lower surface of the.

With the above configuration, by appropriately operating the middle bending cylinder 91, the swing plate 89 is vertically swung, and the opening edge portion of the plate material W can be bent upward.

As shown in FIG. 5, a bending angle adjusting device 95 for adjusting the bending angle by adjusting the stroke of the middle bending cylinder 91 is provided at an appropriate position of the front plate 9. .

When the edge portion of the plate material W is bent upward or downward as described above, and when the opening edge portion of the plate material W is bent upward, the upper bending beam 45, the lower bending beam 67, the middle In order to move the swing center of the bending beam 87 back and forth according to the plate thickness of the plate material W, a clearance adjusting device 97 is provided.

More specifically, referring to FIG. 6, a motor 99 such as a pulse motor or a servo motor capable of rotating in the forward and reverse directions is mounted on the rear portion (right side in FIG. 6) of the fixed frame 3. Although not shown in the figure, the rotation of the motor 99 is transmitted to the first eccentric shaft 43, the second eccentric shaft 65, and the third eccentric shaft 85 via a belt, a speed reducer, and a gear transmission. There is.

Therefore, by appropriately controlling the rotation of the motor 99, the first eccentric shaft 43, the second eccentric shaft 65, and the third eccentric shaft 85 are interlocked and appropriately rotated. That is, the eccentric portions 43E, 65E, 85E of the first, second, and third eccentric shafts can be moved back and forth at the same time, and the upper bending beam 45, the lower bending beam 67, and the middle bending beam 87 can be moved back and forth at the same time. Can be moved to.

With the above configuration, the interval between the lower die 11, the upper split die 19 and the upper bending die 41, the lower bending die 59, and the middle bending die 83 in a state where the plate material W is pinched and fixed is adjusted. The thickness can be adjusted at the same time. Further, after the bending of the plate material W is completed, the motor 99 is appropriately operated to move the upper bending beam 45 and the lower bending beam 67 forward, so that the bending of the edge portion of the plate material W becomes sharper. You can go and correct the springback.

The elevating cylinder 15, which is a pressing member for moving the upper split mold 19 up and down, will be described in more detail.

Referring to FIGS. 2 and 3, the elevating cylinders 15 as pressing members are arranged at, for example, five positions in the plate width direction as shown in FIG. One lifting cylinder 15a is provided at the center, two lifting cylinders 15b are provided on both sides thereof, and two lifting cylinders 15c are provided on both sides thereof.

The lifting cylinders 15 a, 15 b, 15 c are rotatably supported on the side surface of the frame 5 via a cylinder bracket 13, and are pinned to the clevis 23 provided on the piston rod 17 of the lifting cylinders 15 a, 15 b, 15 c. A support member 21 supporting the upper split mold 19 is connected via 101. A balance device 105 is interposed between the bracket 103 locked to the support member 21 and the frame 5 to balance the weight.

A swing arm 27 is fixedly attached to a support member 21 that supports the upper split mold 19, and one end (right side in FIG. 2) of the swing arm 27 is a bracket hung from the lower surface of the frame 5. 25 is rotatably provided via a hinge pin 29.

The hinge pin 29 has a hinge pin 29S that is not eccentric and an eccentric shaft 31 that forms an eccentric portion 31E, and as shown in FIG. 3, the swing arm 27 on the upper and lower sides (the upper and lower sides in FIG. 3). The hinge pin 29 that supports the bearing is supported by the hinge pin 29S that is not eccentric. The hinge pins 29 that support the swing arms 27 at the three inner sides are supported by the eccentric portion 31 having the eccentric portion 31E.

A lever 33 is locked to the eccentric shaft 31, a cylinder 35 having a plurality of stages of strokes is connected to the lever 33, and the other end of the cylinder 35 is a bracket vertically attached to the lower surface of the frame 5. It is rotatably connected to 107.

With the above configuration, by appropriately operating the cylinder 35, the eccentric shafts 31 are individually rotated, and the swing arms 27 are laterally moved by a predetermined amount to bend the upper split mold 19. You can

The lifting cylinders 15a, 15b, 15c, which are pressing members for pressing the upper split mold 19, are operated by the hydraulic circuit shown in FIG. Since this hydraulic circuit has a known structure except for a part, detailed description of the device will be omitted.

As a hydraulic circuit, pressure oil is sent from the oil tank 109 through the filter 111 by the hydraulic pump 113, and the pressure oil flows from the port A of the spring offset internal pilot electromagnetic switching valve 115 to the center through the pipe line 117a. It is sent to the upper oil chamber 119 of the lift cylinder 15a provided. The oil in the lower oil chamber 121 of the elevating cylinder 15a is discharged to the oil tank 109 through the conduit 117b, the throttle valve 123, and the port B of the spring offset internal pilot electromagnetic switching valve 115. That is, since the maximum line pressure is sent to the central lifting cylinder 15a, the upper split mold 19 is pressed with the maximum pressing force.

To the lifting cylinders 15b provided on both sides of the central lifting cylinder 15a, the pipe A passes through the pipe 117a from the port A of the spool offset internal pilot electromagnetic switching valve 115, and is branched from the middle of the pipe 117a. The pressure oil is sent to the upper oil chamber 119 of the elevating cylinder 15b through the duct 127a through the electromagnetic switching valve 125. An electromagnetic proportional pressure reducing valve 129a is incorporated in the middle of the pipeline 127a so that the pressure of the pressure oil can be adjusted appropriately. This electromagnetic proportional pressure reducing valve 129a is adjusted to set a pressure slightly lower than that of the central lifting cylinder 15a. The oil on the lower oil chamber 121 side of the lifting cylinder 15b is discharged from the pipe 127b to the oil tank 109 through the pipe 117b.

Further, the lift cylinder 15c passes through a conduit 131a branched from a conduit 127a for operating the lift cylinder 15b, and pressurized oil is sent to the upper oil chamber 119 of the lift cylinder 15c. An electromagnetic proportional pressure reducing valve 129b is incorporated in the middle of the pipeline 131a. Therefore, by appropriately adjusting the electromagnetic proportional pressure reducing valve 129b, the pressure is reduced to set a pressing force lower than the pressing force of the lifting cylinder 15b. The oil on the lower oil chamber 121 side of the elevating cylinder 15c is discharged to the oil tank 109 side from the pipe line 131b through the pipe line 117b. Reference numeral 133 is an electromagnetic ratio relief valve.

By the above-mentioned operation, the upper split mold 19 is lowered, and the plate material W placed on the lower split mold 11 is pinched and fixed. By switching the offset internal pilot electromagnetic switching valve 115, the pressure oil in each lower oil chamber 121 of the ascending / descending cylinders 15a, 15b, 15c is supplied to raise the upper split mold 19.

As described above, the pressing force of the lift cylinders 15a, 15b, 15c is set such that the lift cylinder 15a provided at the center is operated at the maximum pressure, and the lift cylinders 15b on the left and right are set at a slightly lower pressure. The left and right lifting cylinders 15c are set to a lower pressure.

Therefore, as shown in FIG. 4, the pressing force of the upper split mold 19 is set to 2.5 to 2.3 times the bending force in a normal work, so that it is installed in the center. The pressure of the lifting cylinder 15a is set to 2.5 to 3.5 times the bending force. Then, the pressure oil sent to the lifting cylinder 15b is decompressed by the electromagnetic proportional pressure reducing valve 129a, and the pressure is set to be slightly lower than that of the central lifting cylinder 15a. Further, the lifting cylinder 15c is also depressurized by the electromagnetic proportional pressure reducing valve 129b, and is set below the pressure of the lifting cylinder 15b. As a result, the upper split mold 19 with respect to the lower mold 11 becomes a crown as shown by the solid curve S due to the difference in pressing force with respect to the pressure curve shown by the conventional dotted curve S, and a uniform pressing is performed. Pressure can be applied.

Thus, when the plate material W is bent, it is possible to prevent the central portion of the plate width from becoming unsweetened, and it is possible to deal with the material, the plate thickness, etc. of the plate material W, and to appropriately bend it during normal bending, middle bending, and reverse bending. Since the crowning of the upper split mold 19 can be corrected, the bending accuracy of the product can be improved.

It should be noted that the present invention is not limited to the above-described embodiments, but can be implemented in other modes by making appropriate changes. For example, in the present embodiment, the raising and lowering cylinders 15 are provided at five places, but the number is not limited, and it is possible to use an electric motor or the like instead of the raising and lowering cylinder 15. In addition, although the mechanism in which the cylinder 35 and the eccentric shaft 31 are combined is used in order to impart the bending to the upper split mold 19, it can also be adopted in a plate material bending machine which is not equipped with such a mechanism. is there. Furthermore, it is possible to simultaneously operate a mechanism that combines the cylinder 35 and the eccentric shaft 31.

[0056]

[Effect of device]

 As can be understood from the above description of the embodiment, according to the present invention, the pressing force of the plurality of pressing members acting on the upper split mold can be adjusted, so that the material of the plate material to be handled and the plate The pressing force in the plate width direction can be changed in accordance with the thickness, etc., and the pressing force at the center of the plate width can be set higher and then gradually set downward toward the outside. For this reason, it is possible to prevent the pressing force at the center of the plate width from being weakened as in the conventional case, and to improve the accuracy of the bending angle of the plate material.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a hydraulic circuit in a bending angle correction device according to the present invention.

FIG. 2 is an enlarged view of a portion indicated by an arrow II in FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is an explanatory diagram showing a bending curve of an upper split mold.

FIG. 5 is a front view of a plate material bending machine according to an embodiment of the present invention.

6 is a sectional view taken along line VI-VI in FIG.

[Explanation of symbols]

 1 Plate material bending machine 11 Lower mold 15 Lifting cylinder 19 Upper split mold

Claims (1)

[Scope of utility model registration request] 1. A plate material bending machine comprising an upper split mold for clamping and fixing the plate material in cooperation with a lower mold for supporting the plate material, and a plurality of pressing members acting on the upper split mold. And a bending angle correcting device for a plate material bending machine, wherein the pressing force of each pressing member is adjustable.