JPS6225045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll bending device, and more particularly to a roll bending device that can be easily disassembled and assembled.

Generally, a rolling mill has work rolls 1 and 2 and backup rolls 3 and 4, as shown in FIGS. 1 and 2, and these rolls 1 and 4 are supported by jocks 5 and 8, respectively. I have to. Further, the chocks 5 to 8 are housed within a housing 9. Such a rolling mill is equipped with a roll bending device for adjusting the elongation state of the rolled material 10 (FIGS. 3 to 5), and the work rolls 1 and 2 are shaped into concave crowns by this device. Give day crease bending (3rd
(Fig. 4) and increases bending to create a convex crown (Fig. 4). These operations are carried out using the day crease cylinder 11 interposed between the work roll jocks 5, 6 and the backup roll jocks 7, 8, or the ink cylinder 11 interposed between the upper and lower work roll jocks 5, 6. This is done by the Leeds cylinder 12.

By the way, in the above-mentioned conventional roll bending device, as shown in FIG. 5, due to the structure of the back-up roll jocks 7 and 8, holes 13 and lubricating oil holes 14 are provided in the bearing portions. Since it is located at the mounting position of the day crease cylinder 11 and at the point of force application, there are restrictions on the cylinder arrangement and the magnitude of the bending force. For this reason, roll bending devices have been proposed that provide day crease and increase bending only between the work roll jocks 5 and 6.

A conventional roll bending device is shown in FIG. Such a device includes a piston rod 15 interposed between upper and lower work roll jocks 5 and 6.
and a piston part 1 at the end inserted into the lower chock 6.
6 and provided in the lower chock 6
7, the piston rod 15 is moved up and down by hydraulic pressure. On the other hand, for the upper choke 5, a mounting bracket 18 integrally attached to the piston rod 15 is inserted into an insertion hole 19. The mounting bracket 18 has a hammer head portion 20 at its tip, which allows the upper chock 5 to be pressed upward. Further, the upper chock 5 has a horizontal hole 21 that communicates with the upper part of the insertion hole 19, and a U-shaped socket 22 is inserted into the horizontal hole 21. The lever 22 is fitted into the lower small diameter portion 23 of the hammer head portion 20 inserted into the insertion hole 19, connects the piston rod 15 and the upper chock 5, and supports the day crease bending force. be. Therefore, in such a roll bending device, increase bending is performed by pressing the upper work roll yoke 5 through the hammer head portion 20 by upward movement of the piston rod 15, and day increase bending is performed by moving the piston rod 15 upwardly to press the upper work roll chock 5. This is done by attracting the upper chock 5 through the hammer head 20 and the lever 22 by moving it downward.

However, the roll bending device described above has a drawback that it is extremely difficult to use in practice. That is, when replacing rolls, it is necessary to disassemble and assemble the roll bending device, but this work is extremely complicated. Specifically, the upper and lower work roll chock 5 and 6 are assembled outside the mill, but the upper chock 5 is attached to the upper and lower work roll assembly from above. At this time, it is necessary to operate the hydraulic system to push up the piston rod 15, and manually insert the stopper 22 into the small diameter portion 23 in the upper chock 5. For this reason, in the conventional device, hydraulic operation must be performed outside the mill, and when the hydraulic hose is removed when installing the device on the mill, the oil in the cylinder portion 17 leaks outside, which is not preferable. There are no problems. In this case, it may be possible to operate the piston rod 15 pneumatically instead of hydraulically; however, when hydraulic oil is later supplied to the cylinder section 17, air is sealed in the cylinder section 17.
This method cannot be used because vibrations and vapor lock phenomena occur.

SUMMARY OF THE INVENTION The present invention has focused on the above-mentioned conventional problems, and aims to provide a roll bending device that can be easily disassembled and reassembled without requiring hydraulic operation.

In order to achieve the above object, the roll bending device according to the present invention is particularly designed to be inserted into a work roll chock insertion hole on the side where the piston portion of the piston rod is inserted, and A cylinder forming a sealed chamber is provided upright at the bottom of the mounting bracket, and the mounting bracket provided on the piston rod is provided with an air introduction hole that opens at the top surface of the hammer head portion and communicates with the sealed chamber. The piston rod can be connected to an air introduction means for supplying air to the piston rod, and the piston rod can be moved up and down by pneumatic operation independently of the hydraulic operation means, thereby facilitating assembly and disassembly work.

Embodiments of the present invention will be described in detail below with reference to FIG. 7 and the subsequent drawings. Note that the same numbers are given to the same components as in the conventional example.

FIG. 7 shows a sectional view of the roll bending device according to this embodiment in an assembled state. As shown in this figure, a piston rod 15 constituting a roll bending device is interposed between upper and lower work roll jocks 5 and 6 that support a pair of work rolls 1 and 2. The lower end side of the piston rod 15 is inserted into the lower chock 6, and the piston portion 16 provided at the insertion end and the cylinder portion 17 formed in the lower chock 6 form a piston cylinder mechanism. Hydraulic oil supply/discharge ports 24A, 24B are bored in the cylinder portion 17, sandwiching the piston portion 16. Hydraulic oil is supplied or discharged from a hydraulic device (not shown) to the supply/discharge ports 24A, 24B, thereby allowing the piston rod to be removed. 15 is moved up and down.

On the other hand, the upper end of the piston rod 15 is inserted into the upper work roll chock 5 together with a mounting fitting 18 integrally connected to the upper end of the piston rod 15. The mounting bracket 18 includes a mounting base 26 that is screwed into a threaded portion 25 formed at the upper end of the piston rod 15, a small diameter portion 23 extending above the mounting base 26, and a mounting base 26 formed integrally with the upper end of the small diameter portion 23. The hammer head section 20 is made up of a hammer head section 20. An insertion hole 19 is formed in the upper choke 5 so that the mounting fitting 18 can be inserted therein. Further, the upper chock 5 is provided with a pair of horizontal holes 21 that communicate with each other at the upper part of the insertion hole 19 (FIGS. 8 and 9).
This horizontal hole 21 is formed to have a rectangular cross-section, and a comb 22 serving as a connecting means can be inserted into this horizontal hole 21. This cotter 22 has a U-shaped plane, and has a small diameter portion 23 of the mounting bracket 18.
It is possible to fit into the Therefore, Kotta 2
2, the lower surface of the hammer head portion 20 is supported, and the upper chock 5 and piston rod 15 can be connected to each other. Note that the handle 27 is provided on the cotter 22 to facilitate its removal.

Further, on the upper surface of the lower choke 6, there is a gland portion 28 which closes the upper opening of the cylinder portion 17 and through which the piston rod 15 can pass.
is attached, and a cylinder 29 is erected in this gland portion 28. This cylinder 29 is arranged and formed so as to surround the piston rod 15, and can be inserted into the insertion hole 19 of the upper choke 5. Further, the cylinder 29 is in sliding contact with a packing 30 attached to the outer peripheral edge of the lower end of the mounting base 26 of the mounting bracket 18, and allows the mounting bracket 18 to move up and down in the sliding state. An end plate 31 is fixed within the cylinder 29 and partitions the piston rod 15 by allowing it to slide therethrough. For this reason,
The cylinder 29 forms a sealed chamber 32 at the bottom of the mounting bracket 18 .

An air introduction hole 33 is bored in the mounting bracket 18 along its axial direction, and the air introduction hole 33
is opened in a screw hole 34 provided in the mounting base 26 into which the threaded portion 25 of the piston rod 15 is screwed, and is also opened in the top surface of the hammer head portion 20. The mounting bracket 18 also has the screw hole 3.
4 and the sealed chamber 32 are formed, and the air introduction hole 33 and the sealed chamber 32 are in communication with each other. Furthermore, an introduction pipe 36 serving as air introduction means can be connected to the opening of the air introduction hole 33 on the hammer head portion 20 side. One end of this air introduction pipe 36 is connected to the air introduction port 33, while the other end passes through the inside of the upper choke 5 and projects from the top surface.
In order to attach this introduction pipe 36, an attachment hole 37 is formed in the upper choke 5 and opens into the insertion hole 19. A nipple 38 is provided at the upper end of the introduction pipe 36, and an air supply pipe 39 can be connected to the nipple 38. Further, a groove 40 is formed on the upper surface of the upper choke 5 so that the air supply pipe 39 can be smoothly connected thereto.

The assembly and disassembly work of the roll bending device constructed as described above is carried out as follows. First, when a roll bending device is assembled by combining the upper and lower work roll jocks 5 and 6 when exchanging rolls or the like, the upper work roll jolt 5 is attached to the lower work roll jolt 6 from above. At this time, the upper end of the piston rod 15 is inserted into the insertion hole 19, and the hammer head 20
It is necessary to raise the piston rod 15 and bring the hammer head 20 into contact with the bottom of the insertion hole 19 so that the piston rod 15 can be locked by the lever 22. For this purpose, the air introduction pipe 36 is inserted through the mounting hole 37 and connected to the opening of the air introduction hole 33 of the hammer head portion 20. Connect the air supply pipe 39 to nipple 3.
8 to supply air to the introduction hole 33. This introduced air enters the sealed chamber 32 through the screw hole 34 and the air vent 35, and applies air pressure to the lower surface of the mounting bracket 18, causing the piston rod 15
Move relative upwards. As a result, the top surface of the hammer head portion 20 comes into contact with the bottom of the insertion hole 19. In this state, as shown in FIG. 8, there is a sufficient distance between the lower surface of the hammer head portion 20 and the bottom surface of the horizontal hole 21, so that the hammer 22 can be moved forward and fitted into the small diameter portion 23. Then, by removing the air supply pipe 39 and the introduction pipe 36, the piston rod 15 descends under its own weight, and the hammer head part 20 is supported with the lever 22 lightly pressed against the lower surface of the horizontal hole 21, completing the assembly work. At this time, the cylinder section 17 that performs hydraulic operation is filled with hydraulic oil, and hoses are connected to the supply/discharge ports 24A and 24B so that the oil in the cylinder section 17 can be taken in and out between it and the oil container. There is.

Conversely, the disassembly of the roll bending device can be carried out by following the procedure reverse to that described above.

As described above, according to this embodiment, the assembly and disassembly work of the roll bending device can be performed using a convenient air source, and air pressure can be introduced into a place isolated from the hydraulic part of the roll bending cylinder. The handle 22 can be attached and detached with. Therefore, since there is no need to perform hydraulic operation outside the mill, the risk of oil leakage can be avoided and assembly and disassembly work can be carried out efficiently.

Although this embodiment has been described with reference to a case where it is applied to a four-high rolling mill, it goes without saying that it can be applied to a bending device for two pairs of rolls in addition to a two-high rolling mill or a six-high rolling mill.

As described above, according to the present invention, it is possible to easily assemble and disassemble the roll bending device without using hydraulic operation.

[Brief explanation of the drawing]

Figure 1 is a diagram of the roll arrangement of the rolling mill, Figure 2 is a side view of the rolling mill, Figure 3 is a schematic diagram of the increasing bending state, Figure 4 is a schematic diagram of the increasing bending state, and Figure 5 is a schematic diagram of the increasing bending state. 6 is a sectional view of a conventional roll bending device, FIG. 7 is a sectional view of a roll bending device according to this embodiment, and FIG. 8 is a sectional view of a conventional roll bending device. Figure 9 is a - line sectional view of Figure 8.
The line sectional view, FIG. 10 is a view taken along the - line arrow in FIG. 7. 1, 2... Work roll, 5, 6... Work roll chock, 15... Piston rod, 16...
...Piston part, 17...Cylinder part, 18...Mounting bracket, 19...Insertion hole, 20...Hammer head part, 21...Horizontal hole, 22...Kotuta, 29...Cylinder, 31...End plate, 32 ...closed room, 33
...Air introduction hole, 36...Air introduction pipe, 39
...Air supply pipe.

Claims (1)

[Claims] 1 A piston rod having a mounting bracket having a hammer head portion and a piston portion at the end is interposed between a pair of work roll chocks provided in a rolling mill, and the piston rod is inserted into one chock into which the piston portion is inserted. In the lowering device, the lowering device is provided with a cylinder part that is movable in the axial direction, and is provided with means for fixing a hammer head part inserted into the insertion hole of the other chock, the chock on the side where the cylinder part is formed has a cylinder part that is inserted into the insertion hole. A cylinder forming a sealed chamber is erected at the bottom of the inserted mounting bracket, and the mounting bracket is provided with an air introduction hole that opens on the top surface of the hammer head and communicates with the sealed chamber. A roll bending device characterized in that means can be connected.