JPS6366605B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll shift type rolling mill.

Roll-shift rolling mills have recently been developed to advantageously obtain flat rolled plates.

For example, work roll 1 as shown in Figure 1,
The back-up rolls that are in direct contact with the rollers 2 and 2 or the intermediate rolls that are interposed between these rolls (indicated by symbols R and R' in the figure) are arranged symmetrically with respect to the center of the rolling line. When the distance δ between the side edge of the rolled material S and the end face of the rolls R and R' is positive as shown in the figure, in order to control the shape of the rolled material S, which is held so that it can be moved laterally (shifted) left and right. Advantageously, a flat plate is obtained; on the contrary, when δ is negative, i.e. the rolled material S
Based on the knowledge that when the rolls R and R' overlap completely, the edges tend to elongate, so the rolls R and R' are shifted according to the width of the rolled material.

Some rolling mills that utilize the above-mentioned rolling behavior are already in operation, but they are generally six-high rolling mills with rolls R and R' as intermediate rolls.
On the other hand, an example as shown in FIG. 2 has been reported regarding a rolling mill in which the intermediate rolls are omitted and backup rolls are used as rolls R and R', and in this case, the backup rolls 11 and 12 are used as rolls R and R'.
The fixed beam 11 is pivoted on the movable beams 11b and 12b via 1c, 11c', 12c, and 12c'.
The hydraulic cylinder 11 is guided by B and 12B.
d and 12d to shift the backup rolls 11 and 12.

In the figure, 3 and 4 are drive spindles for the work rolls 1 and 2, 5 is a pinion stand, 6 is a coupling that connects to the output shaft of the reducer, and 15 is a housing, with the left and right indicated by '' and the top indicated by a subscript. The bottom is shown separately, and 16 and 16' are lowering screws.

However, in the former case, since six rolls are arranged vertically, the height of the window in the housing 15 is naturally high, which is a significant drawback.

Furthermore, since the latter is used even when the midpoint between the roll yokes 11c, 11c', 12c, 12c' of the back-up rolls 11, 12 is significantly deviated from the center of the rolling mill housing 15, the movable beams 11b, 12b and fixed beam 11B,
Uneven rolling loads are applied to the housing 12B, and in order to meet the requirements for strength and rigidity, the housing 12B is thick and large in size, so the window height of the housing 15 ends up being high, and is equivalent to or even more than a 6-high rolling mill. Not only are defects unavoidable, but when the back up rolls 11 and 12 receive rolling reaction force from the work rolls 1 and 2 while being moved laterally to the position shown in FIG.
A large force is applied to the chock 11c, 12c', and a small force is applied to the chock 11c', 12c, resulting in a so-called uneven load state.
Due to the limited load capacity of 1c and 12c', the total rolling force becomes much smaller than in the case without lateral movement.

Therefore, some attempts have been made to move only the reinforcing roll laterally in the axial direction of the roll with respect to the roll chock while holding the roll chock in the window of the housing. In order to reliably support the thrust acting on it, a drive mechanism is required to move it laterally.

In this case, there is also the problem of how to protect the roll journal portion that protrudes from the roll chock due to the lateral movement of the roll from the rolling environment.

The present invention provides a particularly advantageous solution to these problems and proposes a roll shift type rolling mill that can be adapted to practical use.

The present invention is a rolling mill in which a roll supported by a roll chock that is movable only in the vertical direction can be moved laterally in the axial direction of the roll according to the width of the material to be rolled. The cylindrical bearing box, which holds and fixes the thrust bearing that receives the thrust acting on the roll, can slide in the roll axis direction along the inner circumference of the extended shell that surrounds the journal of the roll and is attached to the outside of the roll chock. This is a roll shift type rolling mill, which is connected to a hydraulic cylinder attached to a cap-shaped end cap further attached to the outside of the extended shell through a reciprocating rod.

The roll used for this roll shift may be a work roll, but it is usually recommended to apply it to a back-up roll, since it is complicated to incorporate an expansion joint into the rolling torque transmission shaft system.

It is preferable for such a roll to be supported on a roll yoke via an oil film plain bearing such as a morgoyle bearing, but roller bearings or other rolling bearings can of course be used.

In order to seal the lubricant supplied to these bearings, the sealing means generally applied around the base of the journal part of the roll is a telescopic seal using a telescopic mantle such as a bellows or a multi-insertable cylinder, which is left behind from the bearing support. In practice, it is also necessary to covert and protect the journal portion.

The basic concept of an embodiment of this invention is shown in FIG.
FIG. 4 shows the side surface of the rolling mill, and FIG. 5 shows the cross section of the roll chock at the journal portion of the roll. First, in FIG. 3, the journal portions 11j, 11j', 12j, 12j' of the vertically paired backup rolls 11, 12 are connected to the roll yoke 11c, 12j'.
1c', 12c, and 12c', it is possible to make the lateral movement distance, that is, the stroke, longer than the normal journal part, and depending on the stroke, it is not necessary, but the null part 11j,
The chocks 11c, 11c', 12c, 12c' with built-in bearings 11j', 12j, 12j' are held movable only up and down with respect to the housing tops 15t, 15t', and are connected to the lowering screws 16, 16'. This example illustrates the case where both the upper and lower back up rolls are shifted in opposite directions, but in equipment where there is little need to accurately align the width center of the rolled plate S with the center of the rolling line. , the roll shift operation may be applied to only one of the upper and lower roll pairs, and in any case, the same mechanism can be applied to the roll shift operation of the back-up rolls 11 and 12 for the upper and lower pairs, so the above will be explained below. The explanation will mainly be given to the roll shift of the backup roll 11.

Now, in FIGS. 3 and 4, the drive means used for the roll shift operation are generally shown with numbers 21 and 22.

Further, FIG. 5 shows a typical example of a mogoyle type oil film bearing that supports the journal portion 11j of the back-up roll 11, which is tapered in this example. Illustrated instructions for operating the roll shift.

Incidentally, as is clear from FIGS. 4 and 5, it is of course possible to replace the rolls in the conventional manner.

In FIG. 5, the back-up roll 11 has a tapered shaft neck 11t adjacent to its body, and a sleeve 23 having a tapered hole that fits the taper is placed over the sleeve 23 and fixed with a key 24.
The outer periphery of the sleeve 23 serves as the journal part 11j of the roll, and is supported by a so-called oil film bearing which is rotatable with a lubricant film interposed between it and the inner surface of a pushing 25 fixed to the roll chock 11c. Further, a thrust ring 26 is sandwiched between the shaft end 11e adjacent to the outside of the shaft neck 11t and the outer end of the sleeve 23.
The inner ring 28 of the thrust bearing 27, which is usually a tapered roller bearing, is restrained and fixed by an internal threaded cylinder 29, and the outer ring 30 of the thrust bearing 27 is usually restrained and fixed by a preload spring 31, a bearing holder 32, and a restraining ring 32'. Conventionally, this bearing holder 32 was fixed to the roll chock 11c and used as a thrust receiver to support the lateral force acting in the axial direction of the roll, but in a preferred embodiment of the present invention, this bearing holder 32 is The outer periphery of the cylindrical bearing box 33, which is loosely housed with a gap between the cylindrical bearing box 33 and the cylindrical bearing box 33 that holds and fixes the thrust bearing 27 except for restraining it in the radial direction, is used for the propulsion drive for roll shifting. In the illustrated example, a ring-shaped overhanging collar is provided, and the inner circumference of an extended shell 34 is attached to the roll chock 11c in a manner concentric with its bush 25 and surrounding the sleeve 23, and is engaged by a key number 35 in the figure by a sliding fit. With this, it can move forward and backward according to the stroke of the roll shift. 3 in the diagram
6 is a retaining ring for holding and fixing the bearing holder 32 inside the cylindrical bearing box 33, 37 is a set screw thereof, and 38 is a receiving collar.

The cylindrical bearing box 33 has a hydraulic cylinder 40 attached to a cap-shaped end cover 39 attached to the outside of the extended shell 34.
It is connected to the main body via the reciprocating rod 41.

In addition, 42 in the figure is the relay tube used for the above connection, 4
3 is a mounting flange, between which there is a reciprocating rod 4.
The end head 44 of 1 is clamped and fixed.

Therefore, by changing the acting direction of the hydraulic pressure introduced into the hydraulic cylinder 40 using, for example, a switching valve (not shown), it is possible to move the roll 11 forward and backward in its axial direction via the thrust bearing 27. By simply blocking the hydraulic fluid introduced into the hydraulic cylinder using the switching valve at the appropriate setting position of the roll shift determined by the width of the material to be rolled,
The thrust acting on the thrust bearing 27 under the hydraulic lock can be supported under the hydraulic lock.

Note that this roll shift position is determined by, for example, a easy rod 46 being pinned to a clevis 45 provided on the relay tube 42, so that it can be freely inserted and removed through a guide 47 attached to the cap-shaped end cover 39.
Pinion 49, which is bearing with 8, is attached to the rack 4
6 and the rotation angle of this pin shaft 48, an easy-to-read instruction can be obtained.

FIG. 5 shows how the journal portion 11j of the back-up roll 11 has retreated to the extreme position of the stroke of the roll shift. When propelled from this position toward the opposite end position of the stroke, the journal portion 11j Since it enters the rolling work environment, there is a risk of surface damage caused by rolling oil splashes and mill scale scattering, so it is necessary to protect against these and confine the lubricating oil under pressure for circulating lubrication in an enclosed area. In this example, as a means to prevent leakage to the outside, the sealing mechanism in the oil film bearing is utilized as a telescopic seal as follows.

That is, in FIG. 5, 50 is a roll neck seal, 60 is a labyrinth ring,
Roll check 11c at several places on the circumference
It is supported by a guide rod 61 that can be inserted into and removed from the roll neck 63, and is always pressed toward the roll neck 63 via, for example, a coil spring 62 (or an air cylinder may be used).
The bellows 66 attached at 65 surrounds the outer periphery of the journal part 11j, and protects the journal part 11j from the external environment in order to prevent the lubricating oil filled inside from leaking to the outside. Therefore, the lubricant supplied to the journal portion 11j not only has a friction-reducing effect on rotational sliding but also advantageously reduces axial sliding resistance for roll shifting.

Although FIG. 5 shows the position of the right shift limit of the back-up roll 11, an indicator switch for various roll shift positions and a limit switch for left and right shift limits are provided on the pinion shaft 49 for convenience of operation. has been omitted.

Although we have shown an example of using a bellows for protection between the roll chock and the roll neck, bamboo spring cylinders,
A concentric multiple insertion/removal cylinder can also be used as a retractable mantle.

As explained above, in this invention, the roll shift is performed with the roll chock fixed in relation to the housing, so regardless of the size of the stroke, the bearing load is always constant on the left and right sides of the roll, and rolling operations can be performed at full bearing capacity. In particular, since it is not necessary to use it as an intermediate roll in a 6-high rolling mill, there is no disadvantage of increasing the unit consumption of the roll, and since only the roll is moved laterally independently while the roll chock is held and fixed in the housing, the roll The shift operation mechanism is simple, and a conventional four-high rolling mill can be easily adapted to the roll shift system without requiring major modifications, especially since a hydraulic thruster is used as the operation mechanism. , a hydraulic lock ensures reliable roll shift settings.

It is clear that the application of the present invention to work rolls also extends to two-high rolling mills that do not use back-up rolls.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of roll shift rolling procedures, Fig. 2 is a front view of a conventional back-up roll shift rolling mill, Fig. 3 is a front view showing an embodiment of the present invention for a four-high rolling mill, and Fig. 4 is a front view of a four-high rolling mill. Similarly, FIG. 5 is a side view and a sectional view of the journal portion of the roll. 1, 2...work roll, 1c, 1c', 2c,
2c'... Work roll check, 11, 12...
Backup Prowl, 11c, 11c', 12c,
12c'...backup roll check, 15...
... Housing, 33 ... Cylindrical bearing box, 34 ... Extension shell, 39 ... Cap-shaped end cover, 40 ... Hydraulic cylinder, 41 ... Advance/retreat rod.

Claims (1)

[Scope of Claims] 1. A rolling mill in which a roll supported by a roll chock that is movable only in the vertical direction can be moved laterally in the axial direction of the roll according to the width of the material to be rolled, which comprises a journal portion of the roll. A cylindrical bearing box that holds and fixes the thrust bearing that receives the thrust acting on the roll on the outside of the roll is mounted in the roll axis direction along the inner periphery of an extended shell that surrounds the journal of the roll and is attached to the outside of the roll chock. A roll shift type rolling mill is connected to a hydraulic cylinder attached to a cap-shaped end cap further attached to the outside of the extended shell via a reciprocating rod. 2. Claim 1, wherein the roll is supported by a roll chock via an oil film plain bearing.
The rolling mill described in section. 3. The rolling mill according to claim 1, wherein the roll is supported by a roll chock via a rolling bearing. 4. The rolling mill according to claim 1, 2 or 3, wherein the roll chock has an elastic seal that seals around the base of the journal portion of the roll cylinder.