JPH04182006A - Multi roll mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a multi-high rolling mill.

[Prior art] In order to roll difficult-to-process materials that cannot be rolled with a work roll of a normal diameter, some rolling mills are equipped with a rolling mill that can achieve a higher rolling reduction than a work roll of a normal diameter when the same rolling load is applied. There is a Sendzimer-type multi-high rolling mill that uses extremely small diameter work rolls.

As such a multi-stage rolling mill, there is a conventional rolling mill as disclosed in Japanese Patent Publication No. 63-55367, for example.

A conventional multi-high rolling mill will be briefly described using FIGS. 8 and 9.

Work rolls 2 and 3 with extremely small diameters are placed between the upper and lower sides of the rolled material 1, and a plurality of work rolls 2 and 3 with extremely small diameters (2
It is supported by an intermediate roll 4.5 of the book).

The intermediate roll 4.5 is connected to a drive mechanism (not shown), and can be shifted in the width direction 6 of the rolled material 1 by a shift mechanism (not shown). A tapered portion 7.8 is formed whose diameter decreases toward the end.

Each of the upper and lower intermediate rolls 4 and 5 is supported by a plurality of backup rolls 9 and 10 (two rolls each and three in total), and the backup rolls 9 and 10 are provided with an eccentric wheel on a central shaft 11 extending in the width direction 6. It is composed of a plurality of roller bearings 13 that are pivotally supported eccentrically via 12.

In such a multi-stage rolling mill, the rolled material 1 is highly rolled down by the extremely small diameter work rolls 2 and 3, so that it is possible to roll difficult-to-process materials.

Moreover, since it is difficult to directly drive the extremely small diameter work rolls 2, 3, the driving force is transmitted to the extremely small diameter work roll 2.3 via the intermediate roll 4.5.

Since the extremely small diameter work rolls 2 and 3 are easily deformed and cause poor shape of the rolled material 1, the extremely small diameter work rolls 2 and 3 are supported by a plurality of intermediate rolls 4 and 5. Deformation of the small-diameter work roll 2.3 is prevented, and deformation of the rolled material 1 is prevented.

By shifting the intermediate roll 4.5 in the width direction 6, the rolling load is applied to the rolled material 1 in a concentrated manner. At this time, the taper portions 7.8 formed at mutually opposite ends of the intermediate roll 4.5 can create relief at the width end portions of the rolled material 1 of the extremely small diameter work roll 2.3. Therefore, the end extension 14a of the rolled material 1 as shown in FIG. 10 is prevented.

Furthermore, by supporting the intermediate rolls 4 and 5 with a plurality of backup rolls 9 and 10, the reaction force of the rolling load applied to the extremely small diameter work roll 2.3 is transferred to the backup roll 9.
, 10, and the backup roll 9.1
0 is constituted by a plurality of roller bearings 13, so the reaction force of the rolling load is supported by many support points.

Furthermore, the backup rolls 9 and 10 are configured so that a plurality of roller bearings 13 are pivotally eccentrically supported on the central shaft 11 via an eccentric ring 12, so that, for example, as shown by imaginary lines in FIG. By arbitrarily eccentricizing each roller bearing 13, the shape of the extremely small diameter work roll 2°3 is roughly controlled via the intermediate rolls 4 and 5, and the 11th
The middle elongation 14b of the rolled material 1 as shown in the figure is prevented.

[Problems to be Solved by the Invention] However, the above conventional multi-high rolling mill has the following problems.

That is, a thermal crown is generated on the extremely small diameter work rolls 2, 3 due to processing heat generated during the rolling process, and the thermal crown of the extremely small diameter work rolls 2, 3 causes the width dimension to be increased from the width end of the rolled material 1. The 12th place is about 1/4th of the way.
As shown in the figure, a shape defect called a quarter wave 14c may occur, but the quarter wave 14c is caused by bending the extremely small diameter work roll 2.3 by the intermediate roll 4.5 or the backup rolls 9, 10. In some cases, it could not be prevented.

Therefore, a reduced diameter portion (not shown) is formed in the portion of the intermediate roll 4.5 that corresponds to the quarter wave 14c, and relief is created in the portion of the extremely small diameter work roll 2.3 that corresponds to the quarter wave 14c of the rolled material 1. By making quarter wave 1
4c has been proposed, but in this case, if a reduced diameter part is formed in advance on the intermediate rolls 4 and 5, the diameter changes depending on the conditions of the rolled material and rolling conditions such as rolling load and rolling speed. The problem is that the size of the reduced diameter part cannot be adjusted to the size of the quarter wave 14c that occurs, and when the intermediate roll 4.5 is shifted due to a change in the width of the rolled material 1, the intermediate roll 4.5 It has been difficult to put it into practical use due to problems such as the position of the reduced diameter portion formed in 5 being deviated from a portion of the rolled material 1 where quarter waves 14c are likely to occur.

Further, a tapered portion 7.8 is formed on the intermediate roll 4.5 to prevent the end extension 14a of the rolled material 1, but since the shape of the tapered portion 7.8 remains constant, the rolled material It is not possible to correspond to the end elongation 14a which changes depending on the conditions of 1 and rolling conditions such as rolling load and rolling speed, and the end elongation 14a
The corrective ability for a was low.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a multi-high rolling mill that can prevent the occurrence of quarter waves in rolled materials and improve the ability to correct end elongation. It is something.

[Means for solving the problem] The present invention supports a work roll with a plurality of intermediate rolls,
In a multi-stage rolling mill in which each intermediate roll is supported by a backup roll and the intermediate rolls are supported so as to be shiftable in the axial direction, at least one of the intermediate rolls is provided with a taper piston movable in the axial direction inside the roll body. The present invention relates to a multi-stage rolling mill characterized by using tapered piston rolls.

[Function] By using a tapered piston roll as the intermediate roll, the diameter of the intermediate roll can be reduced to match the size of end elongation and quarter waves, which vary depending on the conditions of the rolled material and rolling conditions such as rolling load and rolling speed. The amount is adjusted.

Therefore, end elongation and quarter waves are prevented from occurring in the rolled material.

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

1 to 4 show a first embodiment of the present invention.

In addition, the basic configuration of the multi-high rolling mill and the details of each component in the figure are similar to those shown in Figures 8 and 9, so the same components are the same. The explanation will be omitted by assigning the reference numeral , and only the configuration specific to the present invention will be explained below.

At least one of the intermediate rolls has tapered piston rolls 15a and 15b whose external shape can be changed.

Use 16a and 16b.

The tapered piston rolls 15a, 16a have the following configuration.

That is, a cylindrical space 18 extending in the axial direction (width direction 6 of the rolled material 1) is formed at the axial position of at least one end of the roll body 17, for example, the end on the side where the tapered part 7.8 is provided, and Continuing with the cylindrical space 18, a conical tapered space 19 is formed which extends in the axial direction and whose diameter decreases as it approaches the axial center of the roll body 17.

Taper pistons 20 that can be wedged with the tapered spaces 19 are respectively fitted into the tapered spaces 19 so as to be movable in the axial direction, and a shaft body 21 connected to a bearing (not shown) is fitted into the cylindrical space 18. The tapered space 19 is fixed to be liquid-tight, and a hydraulic chamber 22 is provided between the shaft body 21 and the taper piston 20 and between the taper piston 20 and the roll body 17.
form 23.

As shown in FIGS. 2 and 3, a rod portion 25 that is inserted into a recess 24 formed in the shaft body 21 is provided protrudingly on the surface of the taper piston 20 on the hydraulic pressure chamber 22 side. A liquid chamber 26 is formed between the recess 24 and the recess 24 .

A liquid passage 27 is formed in the shaft body 21 to communicate the liquid pressure chamber 22 with an external liquid supply source (not shown).
6 and an external liquid supply source (not shown) are formed, and a liquid path 29 is formed in the taper piston 20 to communicate between the hydraulic pressure chamber 23 and the liquid chamber 26.

In addition, the taper piston rolls 15a, 15b, 16a, 1
6b wedges the taper piston 20 into the tapered space 19 to expand the diameter of the surface of the roll body 17, and then cuts and flattens the expanded diameter portion of the surface of the roll body 17, thereby making the taper piston 20 tapered. The diameter of the surface of the roll main body 17 is reduced when the roll main body 17 is brought into a lightly fitted state (lightly fitted state or a relaxed wedged state) with respect to the shaped space 19.

In addition, the tapered piston rolls 15b and 16b do not have the tapered portions 7 and 8 on the outer periphery of their end portions, and the tapered piston rolls 15a and 16a do not have the tapered piston 30 located slightly toward the center from the end portions. It has a similar configuration.

Next, the operation will be explained.

The operation of the multi-high rolling mill itself is the same as that shown in FIGS. 8 and 9, so a description thereof will be omitted.

Tapered piston rolls 15a, 15b, 16a, 16b
In this case, when pressure fluid is supplied to the hydraulic pressure chamber 23 through the fluid passages 28 and 29, the taper piston 20.30 moves toward the axial end of the roll body 17 and is lightly fitted into the tapered space 19. state, the taper piston 20 of the roll body 17.
The diameter of the portion where 30 is provided is reduced.

On the other hand, when pressure fluid is supplied to the hydraulic chamber 22 through the fluid path 27, the taper piston 20.30 moves to the center of the roll body 17 in the axial direction and becomes wedged with the tapered space 19, and the roll body The portion where the 17 taper pistons 20 and 30 are provided returns from the reduced diameter state to its original flat state.

and the tapered space 19 of the tapered piston 20.30.
The amount of diameter reduction of the portion of the roll body 17 is adjusted by adjusting the wedged/lightly fitted state.

In this way, by adjusting the diameter reduction amount of the portion of the intermediate roll 4.5, the taper piston rolls 15b and 16b in which the taper piston 30 is provided closer to the center,
The amount of diameter reduction of the portion can be adapted to the size of the quarter wave 14c, which changes depending on the conditions of the rolled material 1 and rolling conditions such as rolling load and rolling speed.

This prevents the quarter waves 14c from occurring in the rolled material 1.

Further, in the tapered piston rolls 15a and 16a where the tapered piston 20 is provided near the end, the end extension 14a
Moreover, by adjusting the amount of diameter reduction of the tapered parts 7 and 8, a high correction ability can be obtained for the end elongation 14a that changes depending on the conditions of the rolled material 1 and rolling conditions such as rolling load and rolling speed. be able to.

5 and 6 show a second embodiment of the present invention, in which a taper piston roll 15a is used as an intermediate roll instead of the 12-high rolling mill in the previous embodiment.

The present invention is the same as the embodiments described above except that it is applied to a 20-high rolling mill having a second intermediate roll 32 between the backup rolls 9 and 15bJ6a, 16b, and the same effects can be obtained.

In addition, in this example, it is also possible to make the 2nd intermediate|middle roll 32 into the structure similar to taper piston rolls L5a, L5b, 16a, and 16b. Furthermore, it goes without saying that the structure of the present invention can be applied to intermediate rolls of 24-high rolling mills and other multi-high rolling mills.

FIG. 7 shows a tapered piston roll 15a used in the present invention.
, 15b, 16a, and 16b.

A sleeve 49 is fitted onto the body of the roll core 48, a tapered space 50 is formed between both ends of the sleeve 49 and the roll core 48, and two tapered piston rings are installed inside the tapered space 50. 51 and 52, and seal ring 53.
The quarter wave 14c and the end extension 14a can be simultaneously corrected by two taper piston rings 51 and 52, and the same effects as in the previous embodiment can be obtained.

Note that the multi-high rolling mill of the present invention is not limited to the above-described embodiments, and the structure of the tapered piston rolls may be arbitrary, and various other changes may be made without departing from the gist of the present invention. Of course you can get it.

[Effects of the Invention] As explained above, according to the multi-stage rolling mill of the present invention, since the tapered piston roll is used as the intermediate roll, it is possible to prevent the occurrence of quarter waves in the rolled material, and also to reduce the edge elongation. This has the excellent effect of increasing the ability to correct the problem.

[Brief explanation of the drawing]

FIG. 1 is a side view of the first embodiment of the present invention, and FIG. 2 is a side view of the first embodiment of the present invention.
Figure 3 is a partially enlarged view of Figure 2.
The figure is an rV-rV arrow view of Fig. 1, and Fig. 5 is a view of the second embodiment of the present invention.
6 is a view along the line VI-VI in FIG. 5, FIG. 7 is a sectional view showing another example of the taper piston roll used in the present invention, and FIG. 8 is a view of the conventional example. A side view, FIG. 9 is a sectional view of FIG. 8 viewed from the front, FIG. 10 is a perspective view showing end elongation occurring in the rolled material, and FIG. 11 is a perspective view showing middle elongation occurring in the rolled material. FIG. 12 is a perspective view showing quarter waves generated in a rolled material. In the figure, 2 and 3 are work rolls, 6 is an axial direction (width direction of rolled material 1), 9.10 is a backup roll, 15a, 1
5bJ6a, 16b is a taper piston roll as an intermediate roll, 17 is a roll body, 20.30 is a taper piston, and 51.52 is a taper piston ring as a taper piston.

Claims (1)

[Claims] 1) In a multi-high rolling mill in which a work roll is supported by a plurality of intermediate rolls, each intermediate roll is supported by a backup roll, and the intermediate rolls are supported so as to be shiftable in the axial direction, at least one of the intermediate rolls has a roll main body. A multi-stage rolling mill characterized by using a taper piston roll equipped with an axially movable taper piston inside.