JPH0857543A - Device for correcting deflection in press brake - Google Patents

Abstract

PURPOSE: To simply correct the deflecting deformation caused asymmetrically at the time of bending a work in a state that the bed part and the ram part are asymmetrically deflected and deformed. CONSTITUTION: Both ends of a beam 140 are energized with an energizing screw 132, and the beam is supported with a moving fulcrum 137c in the direction reverse to the energizing direction of the energizing screw 132. Therefore, the beam 140 is curved at the moving fulcrum 137c as the center. Then, plural numbers of lower wages 150 attached on the beam 140 are advanced or retreated depending on the curved state, and the supporting positions of upper wages whose inclining planes are main in contact with the lower wages are regulated. Accordingly, the supporting positions of the lower die mounted on the upper wages are made to change depending on the deflection amount of the beam 140. In this time, for setting the supporting position of the lower die, the moving fulcrum 137c is moved so as to cancel the asymmetrical deflecting deformation caused in the bed part and the ram part. Therefore, the deflection in the bed and the ram is corrected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexure device for correcting flexure of a ram portion or a bed portion in a press brake.

[0002]

2. Description of the Related Art Conventionally, when a long work is bent by a processing machine such as a press brake, the ram or bed is bent and deformed by a bending force and the work is warped along the bending direction. It has been pointed out that the bending angle becomes uneven. Therefore, Japanese Patent Publication No. 49-27025 proposes a method of embedding the divided wedges in the lower mold assembly, advancing each wedge to make the lower mold middle-high, and thereby correcting the bending deformation. In addition, JP-A-52-12
Japanese Patent Publication No. 0951 discloses a structure in which a cushion device having a large number of small cylinders is provided below a pad that supports a bent portion of a long work, and each cushion device is adjusted so that the lower die has a middle height. .

[0003]

However, the above-mentioned method is constructed on the assumption that the bending work is symmetrical. For this reason, when it is desired to change the bending length or when processing is performed asymmetrically, it is necessary to change the processing position in the machine and the load to be applied, and it is necessary to correct the deflection corresponding to that. In such a case, the method described above requires adjustment of the positions of the wedges at each site, which is troublesome and difficult to perform proper correction. Therefore, an object of the present invention is to provide a deflection correction device in a press brake that solves the above problems.

[0004]

In order to achieve the above-mentioned object, the present invention has a bed-shaped beam on a bed, a plurality of lower wedges, and an integrated body in which the lower wedges and slopes are in contact with each other. A lower mold for V-bending a work by having a bed portion in which an upper wedge and a lower mold are sequentially stacked and arranged, and a ram portion provided with the upper mold to advance and retract the lower wedge. In a processing device that adjusts the height of the beam, a pencil box-shaped base fixed to the bed for storing the beam, the lower wedge and the upper wedge, and a movable fulcrum provided so as to be movable along the side end surface of the beam. The left and right ends of the beam are urged toward the movable fulcrum, and the beam is curved with the movable fulcrum as the apex, so that the height of the slope formed by the plurality of lower wedges arranged on the beam is slightly reduced. The bed part that is adjusted by the processing force and Made and a beam biasing means for correcting the deflection of the arm portion, characterized in that.

For example, the beam urging means comprises an urging screw which is loosely fitted and engaged with the front side plate of the base and is screwed into the beam.

Alternatively, the beam urging means is fixed to the rear side plate of the base to urge the beam toward the movable fulcrum,
It comprises a fluid pressing device having an urging cylinder that moves forward and backward by fluid pressure.

Further, the fluid pressing device has a stopper screw which is screwed into the front plate of the base which defines the position of the beam when the beam is pressed.

Further, in order to roughly adjust the height of each lower wedge arranged on the beam, the lower wedge is screwed into a flange portion erected on the beam and rotatably engaged with the lower wedge. The adjusting screw is provided.

Further, sprockets are fixed to the left and right biasing screws, and the left and right sprockets are driven by a driving means to move both biasing screws back and forth by the same amount or independently.

[0010]

According to the above construction, both ends of the beam are urged by the beam urging means, and an arbitrary point of the beam is supported by the movable fulcrum in the direction opposite to the urging direction of the beam urging means. This causes the beam to bend around the movable fulcrum. Since each lower wedge is engaged with the beam by the adjusting screw, when the beam bends, each lower wedge moves back and forth according to the curved state of the beam, thereby changing the support height of the upper wedge. In order to correct the bending deformation of the bed and ram caused by the processing force, it suffices to change the support height of the upper wedge so as to cancel this bending deformation. Deformation can be corrected.

A biasing screw can be used as the beam biasing means for biasing the beam. The biasing screw is rotatably provided by being loosely fitted to the front side plate of the base, is non-releasably engaged, and is screwed with the beam.
It should be noted that since the sprocket is fixed to the left and right urging screws, and the left and right sprockets are connected by the connecting means to interlock with each other, when the driving force is transmitted to one sprocket, the connecting means is connected. Both biasing screws move back and forth by the same amount. Therefore, both ends of the beam can be moved back and forth by the same amount. It should be noted that the sprocket may be driven by a driving means such as a stepping motor or the like, or may be manually driven in response to a user's request or the like. More complex processing pressure (that is, bending deformation)
The left and right sprockets may be independently driven to cope with the above.

As another beam urging means, it is also possible to use a fluid pressing device having an urging cylinder that advances and retreats by fluid pressure. In this case, the fluid pressing device is fixed to the rear plate of the base to urge the beam toward the movable fulcrum.
Then, when the fluid is injected, the urging cylinder moves forward to urge the beam to bend, and the fluid pressure is released to quickly return to the original position due to the elastic force of the beam. Therefore, the time required for relocation can be shortened. When urging the beam, a stopper screw can be screwed into the front plate of the base to regulate the curved state of the beam, and the curved state of the beam can be defined by setting the stopper screw at a predetermined position. it can.

In order to roughly adjust the support position of the upper wedges supported by the lower wedges, that is, the lower molds, by individually advancing and retracting each lower wedge disposed on the beam with respect to the beam. Adjustment screws are provided. This adjusting screw is screwed with the flange part that is erected on the beam,
Moreover, since the lower wedge is rotatably engaged, the lower wedge slides on the beam surface by rotating the adjusting screw.

[0014]

【Example】

<First Embodiment> A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a front view (FIG. 1 (a)) and a side view (FIG. 1 (b)) of a processing machine 2 provided with a deflection correction device according to the present invention. The processing machine 2 has a bed part 100 and a ram part 200, the bed part 100 has a bed 120 provided with a lower mold 110, and the ram part 200 has a ram 220 having an upper mold 210 attached thereto. There is. Then, the work W is placed on the lower die 110, and is pressed into the lower die 110 so as to be processed into a V shape.

FIG. 2 is a sectional view taken along the line AA in FIG. A brush box-shaped base 130 is fixed to the bed 120, and a beam 140, a lower wedge 150, and an upper wedge 160 are sequentially arranged therein. The lower wedge 150 is divided into a plurality of wedges, and is engaged with a flange portion 141 provided at the rear end of the beam 140 by an adjusting screw 142. Also, the upper wedge 160 is integrally formed, and the lower wedge 1
It is arranged in contact with the slopes of 50. Further, a lower mold holder 170 is provided on the upper wedge 160, and a large number of lower molds 110 are placed on the lower mold holder 170.
It is fixed by a lower die fixing screw 171.

FIG. 3 shows the base 13 when the upper wedge 160 is removed (only a part of the lower wedge 150 is shown).
It is a schematic diagram which shows the mode of 0. Front side plate 13 of base 130
A biasing screw 132, which is a beam biasing means, is inserted into each of the left and right ends of the sprocket 1, and the sprocket 133 and the collar 13 are sandwiched by the biasing screw 132 so as to sandwich the front side plate 131.
And 4 are fixed. Further, the screw portion 1 of the biasing screw 132
35 is screwed with the beam 140, and the sprocket 13
The rotation of 3 enables the beam 140 to be biased. The left and right sprockets 133 are connected by a connecting means 136 such as a chain, and one of the sprockets 13 is connected.
The rotational force transmitted to 3 is transmitted to the other. As a result, the forward and backward movement amounts of the left and right biasing screws 132 are kept the same. The sprocket 133 may be driven by a driving means such as a stepping motor, or may be manually driven in some cases. These can be appropriately selected and designed. Further left and right sprockets 133
It is also possible to drive each of them independently. In this case, more complicated processing pressure (that is, complicated bending deformation)
It becomes possible to correspond to.

The front side plate 131 between the left and right sprockets 133 is provided with a slide hole 138 in which the bracket 137 slides, and a guide groove 139 is recessed in the lower surface thereof. Then, the slide gib 137b provided at the tip portion 137a of the bracket 137 fits in the guide groove 139 and guides the bracket 137 moving on the slide surface 138. Further, a movable fulcrum 137c is fixed to the tip portion 137a of the bracket 137 by a movable fulcrum fixing screw 137d, and the biasing screw 132
Thus, when the beam 140 is biased toward the front side plate 131, the movable fulcrum 137c comes into contact with the abdomen of the beam 140 and bends. Therefore, each lower wedge 150 is
The support height of the upper wedge 160 in contact with the slope of the upper wedge 160 changes according to the curved state of the upper wedge 160.

On the other hand, the beam 140 has a flange portion 141.
The adjusting screw 142 screwed to the flange portion 141 is inserted into the notch portion 151 of the lower wedge 150 and is non-separably stopped by the stopper member 152. Therefore, when the adjusting screw 142 is rotated, it moves forward and backward by screwing with the flange portion 141, and accordingly, the lower wedge 150 moves forward and backward, so that the vertical position of the upper wedge 160, that is, the vertical position of the lower mold 110 can be adjusted. become.

A method of correcting the flexural deformation of the bed portion 100 and the ram portion 200 having the above-described structure will be described. First lower mold 1
The reference screw is adjusted by rotating the adjusting screw 142 so that 10 has a predetermined height. This height is appropriately set according to the correction of the assembly component error, the thickness of the work W, the processing shape, and the like. After that, the biasing screw 132 is rotated to bend the beam 140 in order to correct the bending deformation caused by the asymmetry such as the eccentric load of processing. That is, the movable fulcrum 137c is moved so as to cancel the bending deformation of the bed portion 100 or the ram portion 200 caused by the processing force.
Bending is corrected by bending 0 to change the support height position of the upper wedge 160.

Consider, for example, a case where a work W as shown in FIG. 4 (a) is bent along a machining line L1 to obtain a work W as shown in FIG. 4 (b). In the case of bending with a uniform working force, bending deformation occurs as shown by the solid line L2 in FIG. 4 (c). Therefore, FIG.
When the work shown in (a) is bent under the same conditions,
Bending such as the one-dot chain line L3 shown in (b) occurs,
Sufficient correction cannot be made by bending the beam 140 symmetrically around the central portion of the processing region. That is, the correction of the region corresponding to the shaded portion in FIG. 4 (c) becomes insufficient, so that the bending angle is not constant and becomes as shown in FIG. 4 (d). Therefore, as shown in FIG. 4 (f), the movable fulcrum 137c is moved to bend the beam 140 asymmetrically to adjust the height of the lower wedge 150, that is, the support height of the lower die 110.

The solid line L4 in FIG. 4 (e) shows the height of the lower wedge 150 at the dotted position (processing position) in FIG. 4 (f), and the alternate long and short dash line L3 in FIG. The amount of deformation is shown. The above example is an example, and work W
It goes without saying that it can also be applied to cases where there is a thickness distribution.

<Second Embodiment> A second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In Example 1,
The biasing screw 132 was rotated to bias the beam 140. However, in this case, it takes time to restore the beam 140 to the original state. Therefore, in the second embodiment, the fluid pressing device 300 using a fluid such as hydraulic pressure is used as the beam urging means. And stopper screw 3
The amount of bending of the beam 140 is regulated by 40.

That is, as shown in FIG. 5, the stopper screw 34
0 is screwed into the base 130, and the regulation member 35 is attached to the tip end thereof.
0 is rotatably attached. Then, the stop position of the beam 140 is determined by rotating the stopper screw 340. After that, when the fluid is injected from the fluid injection port 320, the urging cylinder 310 is pushed and the beam 14
When 0 bends, it contacts the stopper screw 340 to determine the curved state. Further, when the fluid pressure is released from the spout 330, the elastic force of the beam 140 causes the beam 140 to instantly return to its original position.

[0024]

As described above, according to the present invention, even if asymmetrical bending deformation occurs in the bed portion and the ram portion due to the asymmetry of the processing force, the movement of the movable fulcrum cancels the bending deformation. It became possible to change the position, and it became possible to correct it extremely easily.

[Brief description of drawings]

FIG. 1 is a diagram showing a press brake in which a correction device according to the present invention is used, in which (a) is a front view and (b) is a side view.

FIG. 2 is a view showing a cross section taken along the line AA of FIG.

FIG. 3 is a schematic view of a bed portion.

4A and 4B are views for explaining application of the bending correction apparatus according to the present invention to an eccentric load, in which FIG. 4A is a top view of a workpiece to be bent, and FIG. 4B is a perspective view showing a desired final processing state;
(c) is a diagram showing the amount of flexural deformation, (d) is a bending state when symmetrically flexurally deformed, (e) is a diagram showing the height correction amount of the lower wedge for flexural deformation, (f) FIG. 6 is a diagram in which a movable fulcrum is moved to correct asymmetrical flexural deformation.

FIG. 5 is a diagram substituted for FIG. 2 applied to the description of the second embodiment.

[Explanation of symbols]

 2 Processing machine 100 Bed section 110 Lower model 120 Bed 130 Base stand 131 Front side plate 132 Energizing screw (beam energizing means) 133 Sprocket 134 Color 135 Screw section 136 Connecting means 137 Bracket 137a Tip part 137b Sliding gib 137c Movable fulcrum 137d Movable Support point fixing screw 138 Slide surface 139 Guide groove 140 Beam 141 Flange portion 142 Adjustment screw 150 Lower wedge 151 Notch portion 152 Stop member 160 Upper wedge 170 Lower die holder 171 Lower die fixing screw 200 Ram portion 210 Upper die 220 Lamb 300 Fluid pressing Device (Beam energizing means) 340 Stopper screw 320 Fluid inlet 310 Energizing cylinder 330 Pouring outlet W Work

Claims (6)

[Claims] 1. A bed comprises a plate-shaped beam, a plurality of lower wedges, an upper wedge that is in contact with the lower wedge and a slope, and a lower mold, which are sequentially stacked. A press brake having a bed part and a ram part provided with an upper mold, wherein the upper mold presses a work placed on the lower mold to perform V bending, and a beam fixed to the bed, A pencil box-shaped base for accommodating the lower wedge and the upper wedge, a movable fulcrum provided so as to be movable along the side end surface of the beam, and the left and right ends of the beam are urged toward the movable fulcrum to move the fulcrum. A beam urging means for bending the beam with the movable fulcrum as the apex, whereby each lower wedge fixed to the beam advances and retreats and finely adjusts the support height of the upper wedge to correct the deflection. Deflection correction device in a press brake characterized by: 2. The beam urging means is loosely fitted / engaged with the front side plate of the base and comprises an urging screw screwed with the beam, and the urging screw is rotated to move the boom forward and backward. The deflection compensating device in the press brake according to claim 1. 3. The beam urging means comprises a fluid pressing device having an urging cylinder that is fixed to a rear side plate of the base and urges the beam toward and away from the movable fulcrum by a fluid pressure. The flexure of the press brake according to claim 1, wherein a fluid is injected to move the bias cylinder forward when the beam is biased, and when the beam is restored, the fluid pressure is released to restore the beam by the elastic force of the beam. Correction device. 4. The press brake according to claim 3, wherein the fluid pressing device has a stopper screw that is screwed to the front side plate of the base to define the position of the beam when the beam is biased. Deflection correction device in. 5. The lower wedges arranged on the beam are moved forward and backward to adjust the supporting height of the upper wedges by the lower wedges, and the lower wedges are screwed into a flange portion erected on the beam,
The deflection correction device for a press brake according to claim 1, further comprising an adjusting screw rotatably engaged with the lower wedge. 6. The sprocket is fixed to the left and right biasing screws, and the left and right sprockets are driven by a driving means to move the biasing screws back and forth by the same amount or independently of each other. Deflection correction device in the described press brake.