JPS6225044B2 - - 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 increase 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 chock 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 lower work roll assembly from above. At this time, operate the hydraulic system to push up the piston rod 15, and insert the lever 22 by hand into the upper chock 5.
3 must be fitted. For this reason, in the conventional device, hydraulic operation must be carried out outside the mill, and when the hydraulic hose is removed when installing it on the mill, the oil in the cylinder section 17 leaks out, so this is not preferable. There are no problems. In this case, it is conceivable to operate the piston rod 15 pneumatically instead of hydraulically; however, when hydraulic oil is supplied to the cylinder section 17 later, air is sealed inside the cylinder section 17, causing vibrations and vapor lock phenomena. Therefore, this method cannot be adopted.

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 has a through hole formed in the axial direction of the piston rod interposed between the upper and lower work roll jocks, and one end of the through hole. An air cylinder mechanism equipped with a rod that can move in and out of the cylinder part that drives the piston rod up and down is provided on the side, and an air introduction means is provided on the other end of the through hole, and is independent of the hydraulic operation means. The piston rod is moved up and down by pneumatic operation, making assembly and disassembly work easier.

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. 8 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 which 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.

In this way, the upper and lower work rolls are moved 5,
The piston rod 15 interposed between the piston rods 6 and 6 has a through hole 28 formed therein along the axial direction of the piston rod 15, which is integrated with the mounting fitting 18. This through hole 2
An air cylinder mechanism 29 is formed on the lower end opening side of 8, that is, at the portion where the piston portion 16 is formed. The air cylinder mechanism 29 is connected to the through hole 2
9 and a rod 31 which is inserted into the cylinder hole 30 and is capable of moving in and out of the cylinder portion 17 of the lower chock 6. This rod 31 protrudes from the lower end surface of the piston rod 15, and its tip can come into contact with the bottom surface of the cylinder portion 17. Furthermore, the through hole 28 opens through the center of the mounting bracket 18 to the top surface of the hammer head portion 20;
Air introduction means can be connected to this opening. An introduction pipe 32 is used as the air introduction means, and this pipe 32 is connected to the opening of the hammer head portion 20 and protrudes from the upper surface of the upper choke 5 to the outside. In order to attach this introduction pipe 32, an insertion hole 19 is provided in the upper chock 5.
A mounting hole 33 that opens to is bored. A nipple 34 is provided at the end of the introduction pipe 32 protruding from the upper surface of the upper chock 5, and an air supply pipe 35 can be connected to the nipple 34. Further, a groove 36 is formed on the upper surface of the upper choke 5 so that an air supply pipe 35 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 during roll exchange, 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. Therefore, insert the introduction pipe 32 from the mounting hole 33,
It is connected to the opening of the through hole 28 of the hammer head portion 20. Thereafter, the air supply pipe 35 is connected to the nipple 34 to introduce air into the through hole 28. By this air introduction, air is supplied to the cylinder hole 30 at the bottom of the piston rod 15, causing the rod 31 to protrude from the bottom surface of the piston rod 15. This rod 31
Due to the protrusion of the piston rod 15, the piston rod 15 is moved relatively upward, and 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.
Since there is a sufficient distance between the bottom surface of the hole 21 and the bottom surface of the horizontal hole 21, the cotter 22 can be moved forward and fitted into the small diameter portion 23. And air supply pipe 3
5 and the introduction pipe 32, the piston rod 15 descends under its own weight, and the hammer head portion 20 is supported with the lever 22 lightly pressed against the lower surface of the side hole 21, completing the assembly work. At this time, the cylinder part 17 that performs hydraulic operation is filled with hydraulic oil, and the supply and discharge ports 24A, 24
A hose is connected to B, and the oil in the cylinder part 17 can be taken in and out between it and the oil container.

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 two-high or six-high rolling mill as well as a bending device for two pairs of rolls.

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 roll bending device according to the present embodiment. 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...Kotta, 29...Air cylinder mechanism, 32...Introduction pipe , 35...
Air supply pipe.

Claims (1)

[Claims] 1. If a piston rod having a piston part and a hammer head part is interposed between a pair of work roll jocks provided in a rolling mill, and the piston rod can be moved in the axial direction into one of the jocks into which the piston part is inserted, In the lowering device, the piston rod is provided with a through hole extending in the axial direction, and one end side of the through hole is provided with the cylinder portion, and the other chock is provided with means for fixing the hammer head portion. 1. A roll bending device comprising an air cylinder mechanism having a rod that can move in and out, and an air introduction means provided at the other end of the through hole.