JP2819448B2 - Hydraulic press brake - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic press brake in which a plate material to be processed is placed between a pressing member and a pressure receiving member and the plate material is bent, and more particularly, to a plate material placed at an asymmetric position. The present invention relates to a hydraulic press brake that corrects the bending of a pressure member and a pressure receiving member that occur when bending a sheet.

[0002]

2. Description of the Related Art In bending a plate material, a so-called press brake is used in which a plate material to be processed (hereinafter simply referred to as a plate material) is placed between a lower die and an upper die and the upper die is pressed toward the lower die. Have been. In this case, the upper die and the lower die are bent and deformed by the application of a load, so that it is difficult to bend the plate material at a uniform angle. For this reason, various methods have been proposed to correct the deflection and to bend the plate at a uniform angle. For example, a large number of wedges are provided below a member supporting the lower die, and individual wedges are put in and out, and the lower die is bent in advance to correct the bending caused by processing. A method has also been proposed in which a large number of cylinders are provided as a substitute for the wedges described above, and each of the cylinders is independently moved up and down for correction.

[0003] In these cases, however, it is necessary to adjust the advance and retreat of each wedge or cylinder each time the length or load of the plate material to be processed changes, requiring a great deal of labor, time or experience. In addition, when the plate material changes with a width smaller than the support surface of each wedge or cylinder (for example, when a hole, a notch or a bar is provided), the characteristic of the plate material changes (for example, In some cases, a large load is applied locally at the notch edge portion), and it has been difficult to correct the deflection while avoiding this.

[0004] From such a viewpoint, Japanese Patent Laid-Open No. 5-20821 is disclosed.
No. 9 proposes a method of, for example, dividing a pressure ram member supporting an upper die into an upper portion and a lower portion and changing the flexibility of the lower portion so as to perform correction. In this publication, a hydraulically operated press brake as shown in FIG. 10 is proposed. In the hydraulically operated press brake shown in FIG.
Consists of an upper part 100a and a lower part 100b, which are in contact with each other at a contact area 101 in the central part.
The upper portion 100a and the lower portion 100b are separated by a gap in which the gap 102 increases continuously toward both ends. As a result, the lower portion 100b is reduced in height (width in the bending deformation direction and length in the vertical direction in FIG. 11) toward both end portions, and is in contact with the upper member at the center portion. It becomes easy to bend as it goes. Therefore, when the pressure ram member 100 is not divided, the central portion bends the most, but by dividing the above configuration, both ends of the lower member 100b are largely bent, and the bent shape of the lower member 100b is fixed. The bending shape of the ram member 106 is matched with the bending shape so that a uniform force is applied to the plate member 105.

[0005]

However, the above-described method is based on the premise that the bending process is performed symmetrically, and is not assumed in the case of processing a plate material placed asymmetrically. That is, as shown on the right side (or left side) with respect to the processing area formed by the pressure ram member 100 and the stationary ram member 106 (hereinafter, the area that can be processed as an apparatus is called the processing area, and the area that is actually processed is called the working area) In the case of bending the plate member 105 placed asymmetrically, the bending deformation accompanying the bending process is also asymmetric, and there is a problem that it is not possible to appropriately correct the bending. Therefore, an object of the present invention is to provide a hydraulic press brake capable of performing processing with a uniform force even in asymmetric bending processing or the like.

[0006]

In order to achieve the above object, according to the present invention, a plate material to be processed is placed on a pressure receiving member having a lower die attached thereto, and a pressure member having an upper die attached thereto is fixed to a frame. In a hydraulic press brake formed by bending a plate to be processed by pressing against a pressure receiving member by a working cylinder, an intermediate member provided on a processing plate material side of the pressure receiving member or the pressing member, and the intermediate member and the intermediate member A movable fulcrum disposed between the pressure-receiving member and the pressure member provided with the member and movably provided in the longitudinal direction between the pressure-receiving member and the pressure member. Restricting the bending deformation of the intermediate member when pressing the processed plate material,
The distance between the working surface of the intermediate member and the working surface of the pressure member or the pressure receiving member facing the same member is made equal, and the load applied to the plate material to be processed is made uniform.

Further, a gap adjusting device for adjusting a gap between the working surface in the left and right portions of the intermediate member and the working surface in the left and right portions of the pressure receiving member or the pressure receiving member opposed to each other is provided between these working surfaces. The bending deformation of the left and right ends of the intermediate member, the pressing member, or the pressure receiving member, which occurs when performing the bending process, is regulated.

The pressure receiving member is supported on the frame by two hinge fulcrums provided at both ends thereof, and the hinge fulcrum and the height adjusting device or the gap adjusting device are arranged on the same vertical line. It becomes. Further, an operation cylinder for urging the pressing member is provided at the left and right end portions of the upper portion of the frame, and an operation point of the operation cylinder is located on the same vertical line as the hinge fulcrum.

[0009]

The operation of the present invention will be described with reference to FIGS. FIG. 1 shows a case of asymmetric processing in a conventional structure. 2 and 3 show a structure according to the present invention. FIG. 2 shows a case where a frame is moved to the center of the processing area.
Indicates a case where the frame is moved to an appropriate position. FIGS. 1 (a), 2 and 3 (a) are schematic diagrams of a hydraulic press brake, and FIGS. 1 (b) and 3 (b) are schematic diagrams showing a state of bending deformation of each member. is there.

As shown in FIG. 1A, when the plate material W is placed asymmetrically with respect to the processing region and processed, the pressing member 10 and the pressure receiving member 20 rotate around both ends of the plate material W due to the eccentric load. Under the moment, the pressing member 10 is moved to the position shown in FIG.
The solid line D and the pressure receiving member 20 are bent and deformed as shown by the solid line A in FIG. At this time, because of the eccentric load, the magnitudes of the right and left rotational moments are different, and a uniform load is not applied to the plate material W having different deformation directions.
In order to solve such a problem, an intermediate member 35 is provided on the pressure receiving member 20, and a movable fulcrum 30 is provided therebetween.

FIG. 2 shows a case where the movable fulcrum 30 is arranged at the center of the processing area.
No. 8219). Due to the eccentric load, the intermediate member 35 rotates counterclockwise and cannot be sufficiently deflected, and the plate material W cannot be bent at a uniform angle.

Therefore, as shown in FIG. 3A, the movable fulcrum 30 is appropriately moved with respect to the plate material W to be processed, so that the bending deformation caused by the movable fulcrum 30 is restricted by the height adjusting pieces at both ends (for example, the lowering by wedges). Fig. 3
The bending shape is as shown by the dotted line C ′ in FIG. Thus, the load applied to the plate material W is made uniform so that the solid line D (the working surface shape of the pressing member) and the dotted line C ′ (the working surface shape of the intermediate member 35) are parallel (equidistant). Becomes possible. In the above description, it is assumed that the pressure receiving member 20 does not bend. However, since the pressure receiving member 20 is slightly bent, the moving position of the movable fulcrum 30 must be considered.

Accordingly, in the present invention, as shown in FIGS. 2 and 3, two ends of the pressure receiving member 20 are supported at two points by hinge fulcrums (white triangle marks), and a cylinder ( Handling is simplified by adopting a two-point pressurization structure in which pressure is applied by a black triangle mark). Although the above description has been made on the assumption that the intermediate member 35 is provided separately, the pressure receiving member 20 may be divided. Also, the intermediate member 3
5 may be provided not only on the pressure receiving member 20 side but also on the pressing member 20 side, and may be a combination thereof.

[0014]

【Example】

Embodiment 1 Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 4 is a front view of the hydraulic press brake according to the present invention, and FIG. 5 is a side view thereof. The hydraulic press brake 5 has a frame 6 as a housing, and a stay 11 is provided on an upper portion thereof, and an operation cylinder 12 is fixed to left and right ends thereof. The head of the working cylinder 12 is attached downward, and the pressing member 10 to which the upper die 13 is attached is fixed to the head.

On the other hand, two pressure receiving members 20 are supported on left and right legs 7 provided on the frame 6 by hinge supports 8. A movable fulcrum 30 movable along the processing area is provided above the pressure receiving member 20, and an intermediate member 35 to which a lower mold 36 is attached with the movable fulcrum 30 interposed therebetween.
Are supported by the height adjusting device 40. The movable fulcrum 30 can be moved by a chain or the like extending right and left. The plate material W to be bent is placed on the lower die 36 provided on the intermediate member 35, and the pressure member 10 is lowered by the head of the working cylinder 12 being lowered. The contact is bent.

The above-described schematic configuration will be described in detail together with the operation description. The plate material W is placed on the lower mold 36 provided on the intermediate member 35.
And the movable fulcrum 30 is appropriately moved. At this time, if the movable fulcrum 30 is in contact with the intermediate member 35, the intermediate member 35 cannot be moved smoothly. Therefore, the intermediate member 35 is lifted by a lift device (not shown). The height adjusting device 40 is provided on the left and right, and when the sprocket 41 is turned, the lower wedge 42 of the pair of upper and lower wedges advances and retreats, and the upper wedge 43 supporting the intermediate member 35 moves up and down. The left and right sprockets 41 are synchronized by a synchronization means (not shown) including a chain, a gear, and the like. However, the present invention is not limited to such means, and can be driven independently of each other, and can be externally controlled by a stepping motor or the like.

The height adjusting device 40 has a function of defining the amount of bending deformation applied to the intermediate member 35.
That is, how much the upper wedge 4
The amount of bending of the intermediate member 35 is determined depending on whether the third member 3 is lowered.
Normally, the cross-sectional performance ratio between the member 10 and the intermediate member 35 is selected so that the amount of bending of the member 10 and the amount of bending of the intermediate member 35 substantially match. The amount of sinking of the upper wedge 43 depends on the plate material W to be processed.
Is appropriately selected depending on the thickness and the processing position. In this state, with the initial setting given to the intermediate member 35, the operating cylinder 12 is operated to lower the pressing member 10.

The working cylinders 12 are provided at the left and right ends of the frame 6, and press the pressing member 10 at two points. Thus, a predetermined eccentric load can be applied to the pressing member 10 regardless of the state of the processing position of the plate material W to be processed.

On the other hand, a load is transmitted to the pressure receiving member 20 via the right and left height adjusting devices 40 and the movable fulcrum 30. At this time, as described above, the position of the movable fulcrum 30 and the height of the upper wedge 43 are determined corresponding to the processing position of the plate material W, so that the load distribution in the pressure receiving member 20 depends on the plate material W to be processed. It becomes different (FIG. 1 (a)). Pressure receiving member 2
0 is a load applied to the height adjustment device 40 by supporting the leg 7 via the left and right hinge fulcrums 8 and arranging the height adjustment device 40 and the hinge fulcrum 8 on a straight line (vertical line). Is transmitted to the hinge fulcrum 8 as it is.

As described above, the pressure receiving member 20 can support a load with the rigidity of the entire member, and the load distribution can be regarded as the load distribution by the movable fulcrum 30, and the deflection of the intermediate member 35 can be easily corrected. It is possible to do.

<Embodiment 2> Next, Embodiment 2 will be described. FIG. 6 shows an intermediate member 35 and a movable fulcrum 30
And a height adjusting device 40 '. Other configurations are the same as those of the first embodiment, and therefore, the same reference numerals are given and the description is omitted. The basic configuration of operation is the same as that of the first embodiment, but the height adjustment device 40 ′ according to the second embodiment.
Is fixed to the pressing member 10, and the height adjusting screw 44 can contact the intermediate member 35.

In this case, the height adjusting screw 44 receives gravity downward when not working, and when working (when applying a load).
Is pushed up. That is, it is necessary to perform deflection correction in consideration of the "play" of the screw. However, Example 1
Then, if it is corrected so that a uniform load is applied to the plate material W,
There is a problem that the plate material W is bent in a state of being deformed in a concave shape (see FIG. 3B). Since this deformation is extremely small, it is not usually a problem. However, depending on the product, the deformation shown in FIG. In such a case, the configuration of the second embodiment is effective. Further, in order to eliminate the "play" of the height adjusting screw 44, a method of biasing the height adjusting screw 44 to information with a spring or the like is possible.

<Embodiment 3> A third embodiment of the present invention will be described with reference to the drawings. FIG. 7 shows a case in which an intermediate member 35 is provided on the pressure receiving member 20 and a gap adjusting device 50 is provided between the intermediate member 35 and the opposing pressing member 20. FIG. Is provided, and a gap adjusting device 50 is provided between the intermediate member 35 and the pressure receiving member 20. The clearance adjusting device 50 includes a clearance adjusting screw 5.
One.

It should be noted that the gap adjusting device 50 includes the intermediate member 3.
5, may be attached to either the pressure member 10 or the pressure receiving member 20, but since the clearance adjustment screw 51 has "play", the clearance adjustment screw 51 is turned upward as shown in FIGS. It is preferable to attach it. By setting the lower surface of the member 10 and the apex of the clearance adjusting screw 51 of the clearance adjusting device 50 to coincide with each other in such a lowering limit, there is an advantage that the deflection can be adjusted accurately and easily.

That is, when the hydraulic press brake shown in FIG. 7 is constructed without using the gap adjusting device 50 according to the third embodiment, both ends of the pressing member 10 and the intermediate member 35 become open ends and large deformation occurs. Occurs. In such a case, if the deflection of the intermediate member 35 is corrected using the movable fulcrum 30, since the amount of correction is large, accurate correction becomes difficult even if the position of the movable fulcrum 30 is slightly shifted. Therefore, the displacement of the both ends of the pressing member 10 and the intermediate member 35 is regulated by the gap adjusting device 50, and the amount of bending thereof is reduced. As a result, the accuracy required for the set position of the movable fulcrum 30 is reduced, and the deflection correction can be facilitated.

<Embodiment 4> A fourth embodiment of the present invention will be described with reference to the drawings. In the embodiment described so far, the case where the deflection correction is performed using one movable fulcrum 30 on the intermediate member 35 has been described. However, it takes time each time the fulcrum is changed, so that it is necessary to perform the correction at a higher speed. In this case, as shown in FIG. 9, a plurality of top adjustment devices 60 each having a top member 61 are provided in the length direction of the mold, and the top member 61 is moved forward and backward. That is, the frame adjusting device 60 in FIG. 9 arranges the intermediate member 35 between the front and rear pressure receiving members 20, 20 via the liners 63, 63 so as to be able to move up and down, and
A frame adjusting device 60 is provided on the upper surface of the device 20. By operating a driving means 62 such as a cylinder in the top adjustment device 60,
The flexural fulcrum of the intermediate member 35 is regulated by moving the top members 61, 61 in place between the upper surface of the pressure receiving member 20 and the shoulder of the intermediate member 35, thereby shortening the movement time of the fulcrum. be able to.

[0027]

As described above, even when the plate material placed asymmetrically on the processing area is bent, the movable fulcrum is appropriately moved in accordance with the eccentric load to reduce the bending deformation of the intermediate member. By regulating, the plate material can be bent at a uniform angle by equalizing the distance between the working surfaces of the upper die and the lower die. Also, a height adjusting device for adjusting the distance between the intermediate member and the pressing member or the pressure receiving member provided with the intermediate member is provided, so that the bending deformation at both ends of the intermediate member is regulated, and It is possible to easily correct the bending deformation. In addition, by providing a clearance adjusting device between the intermediate member and the opposing pressing member or pressure receiving member to regulate the bending of these ends, the accuracy required for the set position of the movable fulcrum is reduced. The deflection can be easily corrected. In addition, the working cylinder, hinge fulcrum,
By arranging the height adjusting device and the clearance adjusting device on a vertical line, by transmitting and receiving the load by the pressing member and the pressure receiving member through the rigidity of these members, it is possible to correct the deflection of the intermediate member as a simple load distribution. It is possible.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams illustrating a problem of a conventional technique applied to the description of the operation of the present invention, in which FIG. 1A is a schematic diagram of a hydraulic press brake, and FIG. 1B is a schematic diagram of bending deformation of each member.

FIG. 2 is a schematic view of the hydraulic press brake of the present invention.

3A and 3B are diagrams illustrating the principle of operation in another configuration of the present invention, wherein FIG. 3A is a schematic diagram of a hydraulic press brake, and FIG. 3B is a schematic diagram of bending deformation of each member.

FIG. 4 is a front view of the hydraulic press brake showing the first embodiment of the present invention.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a schematic front view of a hydraulic press brake showing a second embodiment of the present invention.

FIG. 7 is a schematic front view of a hydraulic press brake including a gap adjusting device according to a third embodiment of the present invention.

FIG. 8 is a schematic front view of a hydraulic press brake provided with a clearance adjusting device according to a fourth embodiment of the present invention.

FIG. 9 is a schematic side view of a hydraulic press brake provided with a frame adjusting device applied to the description of Embodiment 4 of the present invention.

FIG. 10 is a front view of a hydraulic press brake applied to the description of the related art.

FIG. 11 is a diagram illustrating a bending deformation of a member such as a pressing member in FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 5 Hydraulic press brake 6 Frame 7 Leg 8 Hinge fulcrum 10 Pressing member 11 Stay 12 Working cylinder 13 Upper die 20 Pressure receiving member 30 Movable fulcrum 35 Intermediate member 36 Lower die 40, 40 'Height adjustment device 41 Sprocket 42 Lower wedge 43 Upper wedge 44 Height adjusting screw 50 Skimmer adjusting device 51 Skimmer adjusting screw 60 Frame adjusting device 61 Frame member 62 Driving means 63 Liner W Plate material to be processed

Claims (4)

(57) [Claims] 1. A plate material to be processed is placed on a pressure receiving member to which a lower die is attached, and the pressing member to which the upper die is attached is pressed toward the pressure receiving member by an operation cylinder fixed to a frame to bend the plate material. In a hydraulic press brake for processing, an intermediate member provided on a plate material side of a pressure receiving member or a pressing member, and a pressure receiving member or a pressing member provided with the intermediate member are provided. A movable fulcrum provided so as to be movable in the longitudinal direction between the movable fulcrum and the bending deformation of the intermediate member when the workpiece to be processed is pressed asymmetrically with respect to the processing area by the movable fulcrum. A hydraulic press brake, wherein the load applied to the plate material to be processed is regulated by equalizing the distance between the working surface of the intermediate member and the working surface of the pressure member or pressure receiving member facing the working surface of the intermediate member. . 2. A gap adjusting device that adjusts a gap between the working surface at the left and right portions of the intermediate member, the pressure member, and the pressure receiving member facing the working surface at the left and right portions of the intermediate member. The hydraulic press brake according to claim 1, wherein the hydraulic press brake is provided to restrict bending deformation of left and right ends of the intermediate member, the pressing member, and the pressure receiving member that occur when the pressing is performed. 3. A pressure receiving member is supported on a frame by two hinge fulcrums provided at both ends thereof, and the hinge fulcrum and the height adjusting device or the gap adjusting device are arranged on the same vertical line. The hydraulic press brake according to claim 1 or 2, wherein 4. An operation cylinder for urging a pressure member is provided at left and right ends of an upper portion of a frame, and an operation point of the operation cylinder is located on the same vertical line as the hinge fulcrum. Hydraulic press brake as described.