JP2764350B2 - Deflection correction device for bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending correction device for a bending machine.

[0002]

2. Description of the Related Art When performing V-bending while applying compression in the thickness direction to a bent portion of a long sheet material using a bending machine, the effects of compression stress and tensile stress caused by bending, ram,
Due to the bending of the bed or the like, warping occurs along the bending line of the plate material, and the bending angle becomes uneven.

For this reason, divided wedges are buried in a lower die assembly, and each wedge is advanced to make the lower die middle height.
A cushion device using a number of small cylinders is incorporated below a pad for supporting a work, and the cushion is used to raise the lower die to a middle height to prevent bending.

[0004]

However, the conventional deflection compensating device has the following problems and needs to be improved. That is, in a bending operation such as box bending, automatic conversion of the upper mold is often performed, and in the case of embedding wedges in the upper mold assembly, a large number of push screws are adjusted each time to adjust each. The operation is complicated without moving the wedge. When the cushion device is arranged below the pad, each cushion device can be operated at the same time. However, a hydraulic circuit is separately added to prevent oil leakage, so that the entire device must be expensive.

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned disadvantages of the related art, and it is an object of the present invention to simplify the structure so that wedges can be moved simultaneously or individually by one operation. An object of the present invention is to provide a deflection correction device capable of finely adjusting the degree of wedge advance.

[0006]

In order to achieve the above-mentioned object, a deflection correcting apparatus according to the present invention is an apparatus for bending a long plate material using an upper die attached to a lower side of a ram and a lower die disposed on an upper surface of a bed. In the upper or lower mold mounting member, a common driving means is provided by arranging a large number of divided wedge members which can move forward and backward in a direction orthogonal to each mold, and each of the wedge materials is arranged on each wedge material. It is connected to.

The device of the present invention can operate a large number of divided wedges at a time by operating a common drive means, and can operate the clutch mechanism disposed on each wedge at a time. The wedge material to be operated can be selected, and the correction accuracy can be improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the illustrated embodiments. FIG. 1 is a cross-sectional view showing one embodiment of a correction device according to the present invention. In the drawing, reference numeral 1 denotes a bed, 2 denotes a ram, 3 denotes a lower die assembly, and 4 denotes an upper die.

The lower die assembly 3 includes a receiving table 5 placed in the longitudinal direction of the bed 1, a large number of wedges 6 divided on the receiving table 5, a lower die holder 7, and several lower dies 8a. , 8b and 8c.

FIG. 2 is an exploded perspective view of the lower die assembly 3. The receiving stand 5 has front and rear rising edges 9 and 10, and a flat portion 11 provided on the rear rising edge 10 side to a front rising edge. A tapered surface 12 that is inclined forward toward 9 is formed. The tapered surface 12 has, for example, 100 to 20
A large number of wedges 6 divided into 0 mm are placed in the longitudinal direction of the pedestal 5 so that the tapered surface 6a faces downward.

A female screw portion 13 is provided on the front side of each wedge material 6, and a screw shaft 16 inserted through a bearing 15 into a through hole 14 provided on the front rising edge 9 of the receiving base 5 is screwed together. When the shaft 16 is rotated, the wedge material 6 is configured to move in the front-rear direction along the tapered surface 12 of the receiving table 5.

The head side of the screw shaft 16 has a pair of upper and lower bearing members 18 attached in the longitudinal direction of the receiving table 5,
19 is rotatably supported by bearings 20,
A clutch mechanism 26 including a spline shaft 21, a pinion 22, a rack 23, a fixed claw 24, and a cylinder 25 is arranged. That is, as shown in FIG. 1, the spline shaft 21 is inserted into a hollow portion 27 provided on the head side of the screw shaft 16, and a pinion 22 is disposed on the outer peripheral surface of the hollow portion 27. A pin 29 is penetrated by using a long hole 28 provided in the axial direction in 27, and the rotating member 3 attached to the tip end side of the spline shaft 21
0, the pinion 22, and the shaft 16 are connected. An axial groove 31 is formed on the lower surface of the head side of the spline shaft 21, and a convex piece 32
And the air cylinder 25 is arranged on the head end side, and the piston rod 34 is inserted and fixed to the spline shaft 21, and when the rod is extended, it is attached to the tip of the shaft 21. The mounted rotating member 30 slides in the hollow portion 27 of the shaft 16 and simultaneously rotates the pinion 22.
And the rack 23 are disengaged. The air cylinder 25 is connected to a control device (not shown) and operates separately and simultaneously.

Next, the rack 23 that meshes with the pinion 22 and applies a rotational force to the screw shaft 16 will be described. The rack 23 is disposed in a mounting groove 35 provided in the upper bearing member 17 along the length direction, and is connected by a belt 38 to an output shaft 37 of a driving motor 36 disposed on the end side as shown in FIG. And is slid by the rotation of the driving motor 36. The rack 23 is held at a constant pitch in the length direction to prevent deflection. A clutch mechanism 26 is operated on the rear side of the rack 23 so that the screw shaft 1
A fixing claw 24 is provided for fixing the pinion 22 at the standby position when the pinion 22 attached to 6 and the rack 23 are disengaged. As shown in FIG. 1, the pawls 24 are arranged so as to mesh with each other while the pinion 22 slides in the direction of releasing the engagement with the rack 23. The tooth profile pitch of the pawls is shown in FIG. 4 in this embodiment. Thus, the pitch is set to one half of the tooth pitch of the pinion 22. Note that the tooth pitch is not limited to one-half, but one-third,
A quarter is fine, and the smaller the diameter, the better the accuracy. FIG.
A, 5B, the fixed claw 65 may be a spring leaf.

Regarding the operation of the deflection correcting apparatus of the present embodiment having the above-described configuration, the center of the lower mold is convex and slightly bent in a mountain shape.
A description will be given based on an example in which a strain caused by deflection of a ram and a bed at the time of bending is corrected in advance. First, the lower die assembly 3 is moved in the front-rear direction by a sliding mechanism (not shown), and the lower die 8a, 8b, 8c to be used for processing is set to the lower die 8b.
Is set at a position facing the upper mold 4. In this state, the upper end surface of the lower die 8b is parallel to the bed 1 (FIG. 6). Next, when the motor 23 for driving the rack 23 is rotated to slide the rack, the pinion 22 meshing with the rack 23 is rotated, and at the same time, the screw shaft 16 is rotated to raise the wedge material 6 and move the pedestal. The lower die 8b on the upper part 5 is raised. Then, of the cylinder 25 attached to the wedge material 6,
The cylinders 25 (25a, 25b, 25g, 25h in FIG. 6) of several wedge materials on the left and right end sides were operated by a control device (not shown) to extend the piston rods 34 and attached to the respective wedge materials 6. Screw shaft 1
The engagement between the pinion 22 and the rack 23 is released, and the pinion 22 is fixed to the fixing claw 24 in a standby state. Then, when the motor 36 for driving the rack 23 is rotated to slide the rack, the pinion 22 other than the canceled one is rotated, and the wedge material 6 attached to the shaft 16 is raised. In the same manner, finally, except for the cylinders 25d and 25f in FIG.
When the rack 23 is slid by canceling the engagement between the lower die 8 and the rack 23, only the wedge material 6 corresponding to the cylinders 25d and 25f rises, and the lower
b can be a middle-high. When the work plate W is placed on the upper surface of the lower die 8b having the middle height as described above and the ram 2 is lowered, V-bending can be performed. In the above description of the operation, an example in which the lower die is set to a middle height has been described, but correction of the lower die as shown in FIG. 7 is also possible by applying a clutch mechanism.

FIG. 8 is a sectional view of a lower die assembly showing another embodiment of the present invention. In this embodiment, a screw shaft 51 is attached to a plurality of divided wedges 50 placed on a receiving table 5.
And the pinion 52 on which the shaft 51 is disposed
And a rack 54 disposed on the bearing member 53 of the shaft 51.
And the rack 54 is slid, the screw shaft 51 is rotated, and the wedge material 50 is raised and lowered. And the pinion 52 and the rack 5
The rotational power generated by the engagement with the shaft 4 is transmitted by an electromagnetic clutch 55 disposed on the shaft 51.

That is, as shown in FIG. 8, a large number of divided wedges 50 are arranged on the upper surface of the receiving table 5, and a screw shaft 51 is screwed into a screw hole 56 provided on the front side of the wedge. The head side is supported by a bearing member 53 with a bearing 57. On the wedge material side of the shaft 51, a clutch member 59 that magnetizes when an electromagnetic coil 58 fixed to the bearing member 53 is energized is connected to the key 6.
Fix using 0. The electromagnetic coil 58 is connected to a control device (not shown) and is energized separately and simultaneously. On the other hand, the screw shaft 51
A pinion 52 is freely slidably inserted into the head side of
A rack 54 in which this pinion 52 is arranged on a bearing member 53
And a friction plate 62 is formed integrally with the pinion 52 on the clutch member 59 side. The rack 54 is disposed in a mounting groove 63 provided in the bearing member 53 as in the first embodiment, and is slid by a drive mechanism (not shown) such as a motor provided at an end.

The deflection correcting apparatus of the present embodiment having the above-described configuration has
As in the first embodiment, the sliding force of the rack 54 is transmitted to the shaft 51 via the pinion 52 as a rotational force,
The wedge material 50 is raised and lowered. That is, in order to raise and lower the wedge material 50 corresponding to the portion of the lower die assembly 3 that requires correction, the screw shaft 51 screwed to the wedge material is rotated. The electromagnetic coil 58 disposed on the bearing member 53 is energized. By energizing the electromagnetic coil,
The clutch member 59 magnetizes and pulls the friction plate 63 of the pinion 52, so that the clutch member 59 and the pinion 52 are connected.
When the rack 54 is slid in this state, the pinion 52 meshing with the rack rotates, and since the pinion 52 is connected to the clutch member 59, the screw shaft 51 rotates to move the wedge material 50 up and down. Things. Since the correction device of the present embodiment has the above-described configuration, and particularly uses an electromagnetic coil as the clutch mechanism, the structure and control method are simple, and the device itself can be made compact. In the explanation of the operation of each of the above embodiments, the operation is divided for each operation for the sake of convenience. However, since the wedge material stores the current position and can be compared with the target position, the angle of the bent product is measured. Based on the data, the bending angle can be corrected immediately after increasing or decreasing the movement of the wedge in that portion. Needless to say, in actual operation, the operation is automatically and continuously performed by NC control or the like.

[0018]

According to the present invention having the above-described structure, it is possible to perform deflection correction of a bending machine by remote control and with high accuracy. In addition, deflection correction work that differs for each thickness, length and bending shape of the plate material, that is, the degree of advance and retreat of the wedge material is managed as data, and if this is input to the control device, the correction work can be performed automatically. By combining this with the automatic bending operation, a person other than a specialist can perform the bending operation.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a main part of one embodiment of the present invention.

FIG. 3 is a partially omitted front view showing an end of a rack.

FIG. 4 is a diagram showing a pinion and a fixed claw.

FIG. 5A is a view showing a modified example of a fixed claw.

FIG. 5B is a diagram showing a modification of the fixed claw.

FIG. 6 is an explanatory diagram showing an operation state of the device.

FIG. 7 is a deflection diagram of a lower mold.

FIG. 8 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

1: bed 2: ram 3: lower mold assembly 4: upper mold
5: Cradle 6, 50: Wedge material 6a, 12: Tapered surface 7: Lower die holder 8a, 8b, 8c: Lower die 9, 10: Rising edge 1
1: Flat portion 13: Female thread portion 14: Through hole 15, 20, 57: Bearing 16, 51: Screw shaft 18, 19, 53:
Bearing member 21: Spline shaft 22, 52: Pinion 23, 5
4: Rack 24: Fixed claw 25: Cylinder 26: Clutch mechanism
27: hollow portion 28: elongated hole 29: pin 30: rotating member 31: groove
32: convex piece 34: piston rod 35: rack mounting groove 36: motor 37: output shaft 38: belt 55: electromagnetic clutch 56: screw hole 5
8: Electromagnetic clutch 59: Clutch member 61: Key 62: Friction plate

Claims (4)

(57) [Claims] An apparatus for bending a long plate material using an upper die attached to a lower side of a ram and a lower die disposed on an upper surface of a bed,
In the upper die or the lower die mounting member, a large number of divided wedge materials that can move forward and backward in the direction orthogonal to each die are arranged, and a common drive unit is provided by a clutch mechanism in which each wedge material is arranged in each wedge material. Deflection correction device for bending machine connected. 2. The flexure according to claim 1, wherein the drive means is a screw shaft screwed to the wedge material, a pinion attached to the end of the shaft, and a rack that meshes with the pinion and slides by a drive mechanism. Correction device 3. A clutch mechanism, wherein a spline shaft is inserted into a cavity provided at an end of a screw shaft, and the shaft is directed from a pinion arranged on the outer peripheral surface of the cavity to an elongated hole provided in an axial direction on an outer wall of the cavity. 2. The method according to claim 1, wherein the shaft is attached to a shaft by a penetrated pin, and the shaft is provided with a cylinder that shifts the shaft to disengage the pinion from the rack and locks the pinion with a fixed claw disposed in front of the rack. Deflection correction device. 4. A clutch mechanism, comprising: a clutch member fixed to a wedge material side of a screw shaft; an electromagnetic coil for magnetizing the clutch member; and a loosely inserted head side of the screw shaft; 2. The deflection correcting device according to claim 1, further comprising a pinion having a friction plate on a clutch member side.