JP3621956B2 - Elevating device for pressing dies in bending rolls - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a pressing die lifting device in a bending roll.
[0002]
[Prior art]
Conventionally, in a bending roll for conical bending or cylindrical bending, a pressing die for pressing a plate material on the lower surface of the central roll by two lifting cylinders is provided between two side rolls (Japanese Utility Model Publication No. 45-33874).
[0003]
However, with the two push-up cylinders, accuracy cannot be expected at the level of both ends of the upper surface of the press die, and it takes time to finish the conical cylinder or cylinder after bending, and skill is required.
[0004]
Therefore, as shown in FIG. 6, racks are provided on the side surfaces of both ends of the die, and pinions provided on the parallel interlocking shafts are engaged with the racks, and the bearings of the interlocking shafts are installed in the middle of the machine base, that is, inside the racks and pinions. Attached to the table, the mold was moved up and down in parallel.
[0005]
However, when an eccentric load or an eccentric load (off-center load) is applied to the stamping die in cylindrical bending or conical bending, the pinion bearing support often swings outward, and the meshing between the rack and the pinion tends to come off on the eccentric load side. Can not be accurately cylindrical and conical bending up and down in an oblique state. Especially in conical bending, the upper roll is tilted and the steel plate material is pushed up by the pressing die, so that a strong clamping force acts, the engagement between the rack and the pinion on one end side is released, and the pressing die cannot be kept horizontal and tilts. There was a problem that a phenomenon occurred and it was difficult to perform smooth conical bending.
[0006]
[Problems to be solved by the invention]
It is an object of the present invention to obtain a lifting device for a pressing die in a bending roll that prevents the racks and pinions on both sides of the pressing die from being disengaged, enables the horizontal lifting of the pressing die, and can smoothly perform cylindrical bending and conical bending. Objective.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a pair of stands on a machine base, supports two side rolls and a vertically movable central roll between the stands, and between the side rolls and below the central roll. A vertically movable mold having the same length as that of the central roll is provided, the upper surface of the mold is formed as a concave surface having a curvature radius substantially the same as the radius of the central roll, and the central mold is pushed up by a hydraulic cylinder. In the bending roll that can be pressed onto the lower surface of the pair, the hydraulic cylinder is housed in a box fixed to the opposing surface of the stand at the center of the opposing surface of the pair of stands, and racks are mounted on both side surfaces of the pressing die. And the pinions provided at both ends of the interlocking shaft provided parallel to both sides of the stamping die are engaged with the rack, and the interlocking shaft is extended from the pinion to extend the extended portion from the both side plates of the upper box. A lifting device for a pressing die in a bending roll, which is supported by a horizontal support plate fixed to a stand and a machine base, and has a downward reinforcing plate on the lower surface of the pressing die. It is comprised by the raising / lowering apparatus for pushing molds in the bending roll of the said invention which hangs down to the pushing die and 1 body, and provided the rack on the both sides of both ends of this reinforcement board.
[0008]
[Action]
In the present invention, the pressing die is pushed up by the hydraulic cylinders at both ends between the two side rolls toward the lower surface of the central roll, and the tip of the steel plate is sandwiched between the upper surface of the pressing die and the lower surface of the central roll, After bending the tip part to the curvature of the center roll and the upper surface of the mold, the two side rolls can be driven and rotated in the same direction, and the center roll can be driven to bend the steel sheet material into a cylindrical shape, and The roll can be bent into a conical shape by performing the above-described operation with a slight inclination.
[0009]
During the bending operation, the hydraulic cylinders at both ends perform uniform lifting of the stamping die, but the stamping die is subjected to a side load due to a slight inclination of the center roll, a slight difference in the allowable accuracy of the thickness of the steel sheet, or eccentric lifting. The extension of the interlocking shaft is pivotally supported by bearings provided on the outer surfaces of both side plates of the box fixed to the opposite surface of the stand, and the outer surfaces of both side plates are supported by the horizontal support plate fixed to the stand and the machine base. Since it is supported from the outside, even if the pinion receives a strong force toward the outside from the rack that rises as the die rises, the strong force is received by the bearing, so the rotational force due to the meshing of the rack and the pinion is It is transmitted to the interlocking shaft, and the pinions at both ends rotate simultaneously with the same number of teeth, and there is no possibility that the pinion will swing outward through the rack, and the intermeshing will not be disengaged. Therefore, even if an eccentric load and an eccentric load are applied to one end of the pressing die, the rising level of the pressing die does not change at both ends.
[0010]
【Example】
A pair of stands 1, 1 are provided near both ends in the longitudinal direction of the machine base 12 formed by forming a rectangular outer peripheral edge with the groove portion of the U-shaped steel 12 ′ facing outward, and between the stands 1, 1. Two horizontal rolls 11 and 11 (side rolls) and a vertically movable central roll 10 are supported. The side rolls 11, 11 can be provided with drive gears having the same number of teeth outside the one stand 1, and an intermediate gear can be engaged between the gears and rotated in the same direction. The central roll 10 is provided with bearing support cases 14, 14 that are slidable up and down in upright guide grooves 13, 13 formed in the center of both stands 1, 1, and bearings 15, 15 in the support cases 14, 14. The support casings 14 and 14 are moved up and down by hydraulic cylinders 16 and 16 provided at the upper ends of the stands 1 and 1.
[0011]
Further, one end of the central roll 10 is extended from the bearing 15 and the extension 10 ′ is inserted into the upright guide groove 17 provided in the third stand 1 ′, and the screw 19 connected to the support 18 is rotated forward and backward. By moving, the central roll 10 between the pair of stands 1 and 1 can be jumped up and slightly inclined in the longitudinal direction.
[0012]
Between the side rolls 11 and 11 and below the central roll 10, a vertically movable horizontal pressing die 4 having substantially the same length as the central roll 10 is disposed, and the upper surface 4 ″ of the pressing die 4 is set to the radius of the central roll 10. The upper surface 4 ″ of the pressing die 4 can be pressed onto the lower surface of the central roll 10 by pushing the both ends of the pressing die 4 evenly with the hydraulic cylinders 2 and 2. A bending roll is formed.
[0013]
The hydraulic cylinders 2, 2 are supported upright on the central part of the machine base 12 in contact with the central part of the opposing surfaces 1 ′, 1 ′ of the pair of stands 1, 1, and the pressing die 4 is placed on the cylinders 2, 2. Supports the lower surface of both ends. The cylinders 2 and 2 are accommodated in a box 3 by upright side plates 3 ′ and 3 ′ fixed to the opposing surfaces 1 ′ and 1 ′ of the stands 1 and 1 by welding (FIG. 1) or bolts 20 (FIG. 2). Racks 5 and 5 are provided on both side surfaces of both ends of the pressing die 4, and the pinions 6 and 6 having the same number of teeth provided on both ends of the horizontal interlocking shaft 7 provided in parallel on both sides of the pressing die 4 are attached to the racks 5 and 5. To mesh.
[0014]
The interlocking shaft 7 is extended from the pinions 6 and 6, and the extension 7 'is fixed by bolts 20 to the outer surfaces of the side plates 3' and 3 'of the box 3 to be supported by the lateral bearings 8 and 8 (metal box). Support. The middle of the outer surfaces of the side plates 3 'and 3' are supported by horizontal support plates 9 and 9 fixed to the upper surfaces of the outer peripheral edges of the stand 1 and the machine base 12 (FIGS. 1 and 2). .
[0015]
The rack 5 can be provided on both sides of both ends of a downward reinforcing plate 4 ′ that is suspended from the lower surface of the pressing die 4 and the pressing die 4.
[0016]
The mounting plate 8 ′ of the lateral bearing 8 can be formed in an L shape, and can be fixed to both side plates 3 ′ of the box 3 and the facing surface 1 ′ of the stand 1 by bolts 20 (FIG. 2).
[0017]
1 and 3, reference numeral 21 denotes a reinforcing plate welded to both side plates 3 ′ and the opposed surface 1 ′ of the stand 1, 22 in FIG. 5 denotes a base plate of the machine base 12, 23 denotes a drive gear box, 24 denotes a drive motor, Reference numeral 25 denotes a handle.
[0018]
【The invention's effect】
In the present invention, as described above, the die is raised to sandwich the steel plate material with the central roll, and the side roll and the central roll are rolled to perform cylindrical or conical bending of the steel plate material (workpiece). Therefore, even if a pressing force in the direction perpendicular to the longitudinal direction of the pressing die acts on the rack due to a twisting of the pressing die due to a side load, etc., the bearing receives the outside or There is no risk of swinging inward, so that there is no risk of disengagement between the rack teeth and the pinion teeth that mesh with the rack teeth, and the cylindrical and conical bending processes are performed smoothly by raising and lowering both ends of the pressing die to a uniform level. Can do.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a pressing die lifting device in a bending roll according to the present invention.
2 is a perspective view of another embodiment of FIG. 1. FIG.
FIG. 3 is a partial plan view of FIG. 1;
FIG. 4 is an overall perspective view.
FIG. 5 is a longitudinal sectional view of a conventional bending roll.
FIG. 6 is a schematic side view of a conventional pressing tool lifting device.
[Explanation of symbols]
1 Stand 1 'Opposing surface 2 Hydraulic cylinder 3 Box 3' Both side plates 4 Stamping die 4 'Downward reinforcing plate 5 Rack 6 Pinion 7 Interlocking shaft 7' Extension 8 Bearing 9 Horizontal support plate

Claims (2)

A pair of stands is provided on the machine base, two side rolls and a vertically movable central roll are supported between the stands, and have approximately the same length as the central roll between the side rolls and below the central roll. A bending roll provided with a vertically movable mold, the upper surface of the mold is formed into a concave surface having a radius of curvature substantially the same as the radius of the central roll, and the mold is pushed up by a hydraulic cylinder and pressed onto the lower surface of the central roll. The hydraulic cylinder is housed in a box fixed to the opposing surface of the stand at the center of the opposing surfaces of the pair of stands, and racks are provided on both side surfaces of the pressing die in parallel with both sides of the pressing die. The pinions provided at both ends of the interlocking shaft provided are meshed with the rack, the interlocking shaft is extended from the pinion, and the extension is supported by bearings provided on the outer surfaces of both side plates of the upper box. , Press die for lifting apparatus in Ben de growl comprising supported by a horizontal support plate fixed to the outer surface of the side plates to stand and machine base. The lifting device for a pressing die in a bending roll according to claim 1, wherein a downward reinforcing plate is vertically suspended from the lower surface of the pressing die, and racks are provided on both side surfaces of the reinforcing plate.

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