JPH08197144A - Elevating device for press die in bending roll - Google Patents

Abstract

PURPOSE: To provide a press die elevating device which enables working with the die held horizontally in cylindrical and conical bending of a work by a bending roll. CONSTITUTION: A pair of stands 1 is provided on a frame 12, two side rolls 11 and a freely elevating center roll 10 are supported between the stands, a freely elevating press die having approximately the same length as the center roll is also provided between the side rolls and below the center roll, the upper face of a die 4 is formed into a recessed face having approximately the same radius of curvature as the radius of the center roll, and the press die is pushed up by a hydraulic cylinder 2, so that the bending roll can be pressed on the lower face of the center roll. Then, the hydraulic cylinder is stored in a box 3 fixed in the center part opposite to the stand; racks 5 are provided on both sides of either ends of the press die, and pinions 6 which are provided on both ends of an interlocking shaft 7 installed in parallel on both sides of the press die are engaged with the racks 5, with the interlocking shaft axially supported by bearings 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die lifting / lowering device for bending rolls.

[0002]

2. Description of the Related 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 a central roll is provided in the middle of two side rolls by two push-up cylinders. -33874).

However, with two push-up cylinders, it was not possible to expect accuracy in the levels at both ends of the upper surface of the die, and it took time and skill to finish the conical cylinder or cylinder after bending.

Therefore, as shown in FIG. 6, racks are provided on both side surfaces of the pressing die, and pinions provided on the parallel interlocking shafts are meshed with the racks, and the bearings of the interlocking shafts are mounted on the intermediate portion of the machine base, that is, on the rack and the pinion. It was attached to the machine base inside and lifted up and down in parallel.

However, when an eccentric load and a eccentric load (out-of-center load) are applied to the die in cylindrical bending and conical bending, the pinion bearing support often swings outward and the engagement between the rack and the pinion is disengaged on the eccentric load side. It is easy to move up and down in the inclined state of the die and it is not possible to make accurate cylinder and conical bending. Particularly in conical bending, the upper roll is inclined and the steel plate material is pushed up by the pressing die, so a strong clamping force acts, the rack on one end side is out of mesh with the pinion, and the pressing die can not keep horizontal and tilts. There is a problem that a phenomenon occurs and it is difficult to perform a smooth conical bending.

[0006]

DISCLOSURE OF THE INVENTION The present invention prevents bending of racks and pinions on both ends of a pressing die from being disengaged, allows horizontal lifting of the pressing die, and can smoothly perform cylindrical bending and conical bending. The purpose of the present invention is to obtain an elevating device for stamping die.

[0007]

To achieve the above object, the present invention provides a pair of stands on a machine base, and 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 pressing die having substantially the same length as the central roll is provided, and the upper surface of the pressing die is formed into a concave surface having a radius of curvature substantially the same as the radius of the central roll, In a bending roll capable of being pushed up by a hydraulic cylinder and pressed against the lower surface of a central roll, the hydraulic cylinder is housed in a box fixed to the facing surface of the stand at the center of the facing surface of the pair of stands. Then, racks are provided on both side surfaces of both ends of the die, and pinions provided on both ends of an interlocking shaft provided in parallel on both sides of the die are engaged with the rack, and the interlocking shaft is extended from the pinion to extend. Part of which is supported by bearings provided on the outer surfaces of both side plates of the upper box, and the outer surface of the both side plates is supported by a horizontal support plate fixed to a stand and a machine stand. Elevating device for a die in a roll In a bending roll according to the above-mentioned invention, a downward reinforcing plate is vertically provided as a unit with a die on the lower surface of the die, and racks are provided on both side surfaces of both ends of the reinforcing plate. Composed of devices.

[0008]

In the present invention, the die is pushed up between the two side rolls toward the lower surface of the central roll by the hydraulic cylinders at both ends, and the tip of the steel plate material is sandwiched between the upper surface of the die and the lower surface of the central roll. After pressing and bending the tip to the curvature of the central roll and the upper surface of the die, the two side rolls are driven and rotated in the same direction, and the central roll is driven to bend the rope plate into a cylindrical shape. Further, the conical shape can be obtained by slightly inclining the central roll and performing the above-mentioned operation.

During the above bending work, the hydraulic cylinders at both ends carry out uniform lifting of the pressing die, but the pressing die is eccentric due to a slight inclination of the central roll, a slight difference in the allowable accuracy of the thickness of the steel sheet material, or an eccentric pushing up. Although it is twisted under load, the extension of the interlocking shaft is supported by bearings provided on the outer surfaces of both side plates of the box fixed to the opposing surface of the stand, and the outer surfaces of both side plates are fixed horizontally on the stand and machine base. Even if the pinion receives a strong outward force from the rack that rises with the rise of the die because it is supported from the outside by the support plate, the strong force is received by the bearings, so that the rack and pinion mesh. Rotational force is transmitted to the interlocking shaft, the pinions at both ends simultaneously rotate with the same number of teeth, and there is no risk of the pinions swinging outward through the rack, and there is no disengagement between the teeth. Therefore, even if an eccentric load or a eccentric load is applied to one end of the die, the rising level of the die does not change at both ends.

[0010]

EXAMPLE A pair of stands 1 and 1 are provided near both ends in the longitudinal direction of a machine base 12 in which a rectangular outer peripheral edge is formed with a groove portion of a U-shaped steel 12 'facing outward. ,
Two horizontal rolls 11 and 11 (side rolls)
And a central roll 10 that can be raised and lowered. Side roll 1
Drive gears having the same number of teeth are provided on the outer sides of one of the stands 1 and 11, and intermediate gears can be meshed between the gears to rotate in the same direction. The central roll 10 has an upright guide groove 13 formed at the center of both stands 1 and 1,
The bearing support casings 14 and 14 that can be slid up and down are provided in
The support casings 14 and 14 are axially supported by bearings 15 and 15 in the support casings 14 and 14, and the support casings 14 and 14 are moved up and down by hydraulic cylinders 16 and 16 provided on the upper ends of the stands 1 and 1.

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 rod 19 connected to the receiving member 18 thereof is attached. By rotating in the forward and reverse directions, a pair of stands 1,
The central roll 10 between the two can be jumped up and tilted slightly in the longitudinal direction.

A vertically movable horizontal pressing die 4 having substantially the same length as the central roll 10 is disposed between the side rolls 11 and 11 and below the central roll 10, and an upper surface 4 "of the pressing die 4 is provided.
Is formed in a concave surface having a radius of curvature substantially the same as the radius of the central roll 10, and both ends of the pressing die 4 are connected to the hydraulic cylinder 2,
The upper surface 4 ″ of the pressing die 4 can be pressed against the lower surface of the central roll 10 by pushing up evenly by 2 to form a bending roll.

The facing surfaces 1'of the pair of stands 1 and 1,
Connect the hydraulic cylinders 2 and 2 to the machine base 12 in contact with the center of 1 '.
Is supported upright in the central portion of the above, and the lower surfaces of both ends of the pressing die 4 are supported on the cylinders 2 and 2. This cylinder 2, 2
Is housed in the box 3 by the upright side plates 3 ', 3'fixed to the facing surfaces 1', 1'of the stands 1, 1 by welding (FIG. 1) or bolts 20 (FIG. 2), and both ends of the die 4 Racks 5 and 5 are provided on both side surfaces of the part, and pinions 6 and 6 having the same number of teeth provided on both ends of a horizontal interlocking shaft 7 provided in parallel on both sides of the die 4 are meshed with the racks 5 and 5.

Further, the interlocking shaft 7 is extended from the pinions 6 and 6 so that an extension portion 7'is formed on both side plates 3'of the box 3.
The horizontal bearings 8 and 8 (metal box) fixed to the outer surface of 3'by bolts 20 are pivotally supported. The middle portions of the outer surfaces of the side plates 3 ', 3'are supported by horizontal support plates 9, 9 fixed to the upper surfaces of the outer peripheral edges of the stand 1 and the machine base 12 (FIGS. 1 and 2). .

The rack 5 has a lower surface of the pressing die 4 and the pressing dies 4 and 1
It can be provided on both side surfaces of both end portions of the downward reinforcing plate 4 ′ hung vertically on the body.

The mounting plate 8'of the lateral bearing 8 can be formed in an L shape and fixed to the side plates 3'of the box 3 and the facing surface 1'of the stand 1 by bolts 20 (FIG. 2). .

1 and 3, reference numeral 21 denotes a reinforcing plate welded to both side plates 3'and the opposing surface 1'of the stand 1, 22 in FIG. 5 is a base plate of the machine base 12, 23 is a drive gear box, and 24 is A drive motor, 25 is a handle.

[0018]

According to the present invention, as described above, the die is lifted to pinch the steel plate material between the central roll and the side rolls and the central roll to roll the steel plate material (workpiece) into a cylindrical or conical shape. During processing, a strong clamping pressure reaction force acts on the pressing die, and even if pressing force in the direction perpendicular to the longitudinal direction of the pressing die acts on the rack due to twisting of the die due to eccentric load, the bearing will There is no danger of swinging outward or inward under the influence of this, and there is no fear that the teeth of the rack and the teeth of the pinion that meshes with it will be disengaged. Can be done smoothly.

[Brief description of drawings]

FIG. 1 is a perspective view showing an elevating device for a die in a bending roll of the present invention.

FIG. 2 is a perspective view of another embodiment of FIG.

FIG. 3 is a partial plan view of FIG.

FIG. 4 is an overall perspective view.

FIG. 5 is a vertical sectional view of a conventional bending roll.

FIG. 6 is a schematic side view of a conventional die lifting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 stand 1'opposing surface 2 hydraulic cylinder 3 box 3'both sides plate 4 pressing die 4'downward reinforcing plate 5 rack 6 pinion 7 interlocking shaft 7'extension part 8 bearing 9 horizontal support plate

Claims (2)

[Claims] 1. A pair of stands is provided on a machine base, two side rolls and a vertically movable central roll are supported between the stands, and the central rolls are formed between the side rolls and below the central roll. An up-and-down pressing die having the same length is provided, the upper surface of the pressing die is formed into a concave surface having a radius of curvature substantially the same as the radius of the central roll, and the pressing die is pushed up by a hydraulic cylinder and pressed onto the lower surface of the central roll. In a possible bending roll, the hydraulic cylinders are housed in a box fixed to the facing surfaces of the stands at the center of the facing surfaces of the pair of stands, and racks are provided on both side surfaces of both ends of the pressing die.
Pinions provided at both ends of an interlocking shaft provided parallel to both sides of the die are meshed with the rack, and the interlocking shaft is extended from the pinion by a bearing provided at an outer surface of both side plates of the upper box. A lifting and lowering device for a die in a bending roll, which is axially supported and in which the outer surfaces of the both side plates are supported by a horizontal support plate fixed to a stand and a machine base. 2. A downward reinforcing plate is provided on the lower surface of the die and the die.
The lifting device for a die for a bending roll according to claim 1, wherein the lifting device is vertically hung on a body and racks are provided on both side surfaces of both end portions of the reinforcing plate.