JPS636286B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll bending device for a rolling mill.

In recent years, work roll bending methods in rolling mills have been developed to control the shape of rolled materials, and roll bending devices for this purpose have also been developed and used.

The bending cylinder in the bending device is preferably installed at a position close to the axis of the work roll, but since the work roll, by its nature, moves up and down, it is not recommended to install the bending cylinder near the axis of the work roll. , the piping configuration becomes complicated. Therefore, as shown in FIG. 1, conventionally, in the increase bending cylinder a, a protrusion block e is provided in the center of the housing d so as to come into contact with the projecting portions c formed on both sides of the work roll shaft box b. I was trying to set it up. However, if such a method is used,
The bending force is determined by the strength of the overhang c, and a large load cannot be applied, which limits the ability to control the shape of the rolled material.

On the other hand, in the case of the day crease bending cylinder f, since the protruding block e cannot be provided on the housing d due to its structure, the only option is to install it directly on the back roll shaft box g, thus avoiding a complicated piping configuration. It was in perfect condition. Furthermore, when changing the rolls, pipes must be replaced, which takes time and reduces productivity.

The present invention has been made in view of the above-mentioned circumstances, and a bending cylinder is provided at a predetermined position of a work roll axle box having an overhang on its side, excluding the overhang, so as to be able to face and abut against the adjacent roll axle box. installed,
The other end of the oil supply pipe, one end of which is connected to the cylinder, is opened and guided to the projecting portion, and an oil supply device that is connectable to the opening at the end of the pipe is provided in a protrusion block provided on the housing. The present invention relates to a roll bending device for a rolling mill.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 2 and 3, 1 is a work roll;
2 is a work roll axle box, 3 is an overhang formed on both sides of the work roll axle box 2, 4 is a back roll, 5 is a back roll axle box, and 6 is a protrusion block provided at the center of the housing 7.

A refueling cylinder 10 is constructed so that the piston rod 9 is always biased with a protruding force by the force of a spring 8 provided inside.
The hydraulic pump 12 and the oil tank 1 are connected to the cylinder 10 through a switching valve 11 attached to the housing 7.
3, and the piston rod 9 is formed into a tubular shape so that the extrusion chamber of the piston rod 9 in the cylinder 10 communicates with the outside of the cylinder 10, so that pressure oil from the hydraulic pump 12 can be sent from the tip of the piston rod 9. A valve body chamber 15 is formed by providing a partition wall 14 in which an oil passage 14' is bored in the tip of the piston rod 9, and the partition wall 14 is provided in the valve body chamber 15.
A ball valve element 18 is provided which can be brought into pressure contact with a valve seat 17 formed at the tip end of the piston rod 9 by a spring 16 interposed between the piston rod 9 and the piston rod 9.

Further, the lower work roll axle box 2 has an overhanging portion 3.
A bending cylinder 19 is installed at a position facing the upper work roll axle box 2 in the part excluding the bending cylinder 19, and the end of the oil supply pipe 20 to the cylinder 19 is connected to the overhang part 3 of the lower work roll axle box 2. Piston rod 9 of the oil supply cylinder 10
An opening with approximately the same diameter as the piston rod 9 is provided at a position facing the piping 20, and a gate valve seat 21 is provided at an appropriate intermediate position in the end opening of the piping 20, so that the piston rod 9 side is used as a connecting portion 22; anti-piston rod 9
A valve body chamber 23 is formed on the side, and a valve body 25 having a protrusion 24 formed at the tip is disposed within the valve body chamber 23, and the valve body 25 is disposed between the valve body chamber 23 and the wall of the valve body chamber 23. The projection 24 is movably supported by an interposed spring 26, so that a force is always applied to the projection 24 in the direction of positioning it within the coupling portion 22.

In the above configuration, when performing increase bending control on a rolled material (not shown), first, the pressure oil in the retraction chamber of the piston rod 9 in the oil supply cylinder 10 is removed by operating the switching valve 11 to reduce the force of the spring 8. This causes the piston rod 9 to protrude, and the tip end of the piston rod 9 is fitted into the joint 22 formed on the overhang 3 of the lower work roll shaft box 2. At this time, the ball valve body 18 in the tip valve body chamber 15 of the piston rod 9
and the valve body 25 of the valve body chamber 23 on the overhanging portion 3 side.
The protrusions 24 of the ball valve body 18 are pressed against each other.
and the valve seat 17 and between the valve body 25 and the partition valve seat 21
A gap is formed between the two. Subsequently, the hydraulic pump 12 is driven to supply pressure oil into the piston rod 9 extrusion chamber of the oil supply cylinder 10. Such pressure oil enters the piston rod 9 and passes through the oil passages 14',
It is delivered into the joint portion 22 of the overhang portion 3 through the valve body chamber 15 and the gap between the ball valve body 18 and the valve seat 15. The pressure oil sent into the joint 22 is further sent into the valve body chamber 23 through the gap between the valve body 25 and the partition valve seat 21, and then sent to the bending cylinder 19 via the piping 20. .

By extending the bending cylinder 19 in this manner, increase bending control can be performed.

On the other hand, as mentioned above, the bending cylinder 19
For example, when performing daily crease bending control from the extended state, the piston rod 9 of the refueling cylinder 10 is always maintained at a protruding force by the force of the spring 8, and is fitted into the feeding portion 22. Therefore, when the switching valve 11 is operated to free the pressure oil in the piston rod ejection chamber of the oil supply cylinder 10, the pressure oil in the bending cylinder 19 flows in the opposite direction to the above-mentioned path and flows into the tank 1.
It will be collected within 3 days.

Furthermore, the work roll shaft box 2 may be damaged due to roll replacement, etc.
When pulling out the switch valve 11 from the housing 7,
to supply pressure oil into the retraction chamber of the piston rod 9 of the oil supply cylinder 10, and
This may be done after the overhanging portion 3 is released from the coupling portion 22 by forcibly retracting it against the force of the spring 8.

In the above embodiment, the present roll bending apparatus was used for increase bending, but as shown by the imaginary line in FIG.
Of course, it is possible to perform daily crease bending by arranging the piston rod 9 to face the connecting portion 22, and a mechanical stopper may be provided to maintain the fitted state between the piston rod 9 and the connecting portion 22. Various changes may be made without departing from the gist of the invention.

As described above, according to the present invention, the end of the oil supply pipe to the bending cylinder and the oil supply cylinder installed in the protrusion block are connected and separated by the overhang formed on the work roll shaft box. Since the piping structure of the bending cylinder is not as complicated as in the past, the bending cylinder can be installed in the part of the work roll axle box other than the overhanging part, and a large load can be applied. This results in excellent effects such as improving the ability to control the shape of the rolled material.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a rolling mill equipped with a conventional bending device, FIG. 2 is an explanatory diagram of a rolling mill equipped with a bending device of the present invention, and FIG. 3 is an enlarged view of a portion of FIG. 2. 2... Work roll shaft box, 3... Overhang, 5...
...Backup roll shaft box, 6...Protrusion block, 7...
Housing, 8... Spring, 9... Piston rod, 10... Oil supply cylinder, 15... Valve body chamber, 16... Spring, 18... Ball valve body,
19...bending cylinder, 20...piping,
22...Connecting portion, 23...Valve body chamber, 24...Protrusion, 25...Valve body, 26...Spring.

Claims (1)

[Claims] 1. A bending cylinder is installed at a required position of a work roll axle box with an overhang formed on the side, excluding the overhang, so as to be able to face and abut the adjacent roll axle box, and one end of the bending cylinder is connected to the cylinder. A roll bend for a rolling mill, characterized in that the other end of the pipe is opened and guided into the overhang, and a lubricating device connectable to the opening at the end of the pipe is provided in a protrusion block provided in the housing. ding device.