JPS62144804A - Multi-stage rolling mill - Google Patents

Abstract

PURPOSE:To reduce the size of construction by supporting one work roll by an intermediate roll and support rolls and supporting the other work roll by an intermediate roll and divided type back up rolls in such a manner that the roll can be pushed horizontally at both sides. CONSTITUTION:The small-sized and chockless upper work roll 3 is supported by the upper intermediate roll 2 and is further supported by the support rolls 8, 9 disposed on the upper and down stream sides of a pass line 5. The small- diameter and chockless lower work roll 12 is pulled and supported by a spring 13 to the lower intermediate roll 11 and is supported by the divided type back up rolls 16, 17. The work rolls 3, 12 are supported in a manner as to offset to the down to the down stream side of the pass line 5. The fluctuation in the horizontal deflection of the work rolls 3, 12 is prevented and the shape control power is improved by such mechanism. The size of the work rolls is thus made smaller and the size of the construction smaller.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention is capable of producing high-quality materials that are conventionally difficult to roll, such as difficult-to-process materials, ultra-thin materials, high-strength materials, and high-alloy steels, at reduced costs. , it must be related to a multi-high rolling mill that can produce products with high productivity.

[Prior art] It has been known that by reducing the diameter of the work roll, the rolling load and rolling torque are reduced, and it is possible to easily roll materials that are difficult to process, ultra-thin H, and other materials that were previously considered difficult. In rolling mills that use small-diameter work rolls, when intermediate rolls or backup rolls are driven, horizontal tangential force acts on the work rolls, and horizontal tension due to the difference in tension between the entry and exit sides. Directional forces will also act on the work roll.

In order to deal with these problems, systems as shown in FIGS. 5 to 8 have been considered.

[Problems to be Solved by the Invention] For example, in order to solve the problem that the work roll is subjected to horizontal force and to improve the shape control ability, as shown in Fig. 5.6, the backing roll a and the intermediate roll A rolling mill has been proposed in which a work roll C is offset d with respect to a rolling line P by b, and horizontal bending is performed from the offset direction by a split backup roll e via a support roll f.

However, when the work roll C has an extremely small diameter (for example, the body length/diameter is 10 or more), even if horizontal bending is applied to counter the offset, there is a lack of ability to stably support the work roll C, and the rolling When the direction is reversed by reversing, the horizontal force acting on the work roll C is reversed, and the ability to control the shape by horizontal bending cannot be sufficiently increased.

Further, as shown in FIGS. 7 and 8, a multi-high rolling mill has been proposed in which support roll groups 9 are arranged on the entry side and the exit side of the pass line in a rolling mill using extremely small diameter work rolls C. However, these rolling mills are designed to control the shape by adjusting the position of the split backup rolls or adjusting the axial direction (shift) of the intermediate rolls, and the rigidity can be increased by solid support. On the other hand, it lacks high-order shape control ability, and the WI structure also has the problem of being complicated.

As is clear from the above, when using a small diameter work roll, the following requirements need to be met.

(1) When using a small-diameter work roll, it becomes difficult to drive the work roll, and an intermediate roll or backup roll must be driven. Therefore, a drive tangential force acts on the work roll, and the work roll is deflected in the horizontal direction due to a horizontal force such as a difference in tension between the front and back, so it is necessary to prevent this current nest from occurring.

(rI) When the diameter of the work roll becomes small, in addition to the horizontal deflection of the work roll, fluctuations in the thermal crown of the roll become large, causing a problem that the shape becomes unstable. Additionally, the space disadvantage of roll cooling further exacerbates these problems.

Therefore, a high degree of shape control ability is required.

(2) When the rolling load changes due to differences in the deformation resistance of the materials or changes in strip width, the deflection of the rolls is more likely to change in small-diameter multi-high rolling mills, and there is no mechanism to reduce these deflection fluctuations. It becomes necessary. (A structure with high lateral rigidity is required.) Qv) When rolling a variety of products, it is necessary to reduce the surface gloss of the rolled material or reduce the number of passes, so a structure that can increase the usable range of work roll diameter is required. It's necessary.

[Means for Solving the Problems] The present invention is an attempt to solve the above-mentioned technical problem. One of the small-diameter work rolls, which are arranged to sandwich the pass line and supported by bearings that are not constrained in the rolling direction, is The work roll is supported by one of the intermediate rolls backed up by a backing roll of a large diameter, and is directly supported by a roll to the Riebau 1 placed upstream and downstream of the pass line, and the other small diameter work roll is supported by a backing roll of a large diameter. It is supported by the other backed-up intermediate roll, and is also supported by split backup rolls having horizontal bending devices disposed upstream and downstream of the pass line so as to be able to push horizontally in both directions via a support roll, and further by both intermediate rolls. This invention relates to a multi-high rolling mill characterized in that it is equipped with a vertical bending cylinder that performs vertical bending, and a shift device that simultaneously shifts in the opposite direction.

[Function] Therefore, in the present invention, since the upper and lower small-diameter work rolls sandwiching the pass line are supported from the upstream and downstream sides of the pass line, horizontal deflection of the upper and lower small-diameter work rolls can be prevented, and one Since the work rolls are subjected to horizontal double-push bending, a high shape control effect can be obtained, and the lateral rigidity can be increased by shifting the upper and lower intermediate rolls in opposite axial directions. Therefore, it becomes possible to further reduce the diameter of the small-diameter work roll.

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

Figures 1 to 3 show an example of the present invention. A chockless upper work roll 3 having a small diameter is attracted and supported by a spring 4 under the upper intermediate roll 2.

Further, on the upstream and downstream sides of the pass line 5 of the upper work roll 3, there are support rolls 8, 9 which are configured to press the upper work roll 3 by means of suppressing devices 6, 7 to determine its l=position. is provided.

Further, a lower intermediate roll 11 backed up by a large-diameter lower backing roll 10 is provided directly above the lower backing roll 10, and a small-diameter and chockless lower work roll is provided above the lower intermediate roll 11. 12 is the spring 13
attracted and supported by

Further, split backup rolls 16 and 17 are arranged on the upstream and downstream sides of the pass line 5 of the lower work roll 12 via support rolls 14 and 15, and one of the split backup rolls 16 and 17 has a Lower work roll 12
Horizontal bending jack 18 for positioning
However, in use, a horizontal bending cylinder 19 for suppressing the lower work roll 12 is also provided to constitute a double push horizontal bending device.

Further, the upper intermediate roll 2 and the lower intermediate roll 11 are each equipped with vertical bending cylinders 20 and 21 so that vertical bending control can be performed.
The upper and lower intermediate rolls 2, 11 are equipped with shift devices 22 and 23.
can be shifted in the opposite direction at the same time. Further, as shown in the figure, the upper and lower work rolls 3.12 are supported in a state offset by S to the downstream side of the pass line 5 with respect to the rolling line P of the rolling mill. In the figure, 24 indicates a thrust receiver for the work roll.

As mentioned above, the upper work roll 3 is the support roll 8.
, 9, the lower work roll 12 is attached to the support roll 14.
Since the split backup rolls 16 and 17 are positioned and supported in the horizontal direction via the upper and lower work rolls 15 and 15, fluctuations in horizontal deflection of the upper and lower work rolls 3 and 12 can be prevented. The double push horizontal bending devices 18 and 19 enable high shape control (high-order shape control according to the board width).

Furthermore, upper and lower intermediate rolls? , 11 by the vertical bending cylinders 20.21, and by shifting the upper and lower intermediate rolls 2.11 in the same and opposite directions by the shift device 22.23, the work rolls 3, 1? This eliminates the need for an initial crown, maintains a high horizontal flash, and, in conjunction with the action of the double-press horizontal bending of the lower work roll 12, improves the shape of edge drops and temporary ends. Furthermore, stable operation can be achieved even in reverse mills. Further, in the above, the upper work roll 3 is supported by the support rolls 8 and 9, and the lower work roll 12 and the lower intermediate roll 11 are in an offset S state, and the lower work roll 12 and the lower intermediate roll 11 are divided into one side. By setting and supporting the auxiliary roll 15 backed up by the backup roll 17 at a reference position with respect to the reduction line P, the lower work roll can be stably supported without being chocked.

Furthermore, since chockless work rolls 3 and 12 are used, roll replacement and maintenance can be facilitated.

Furthermore, as described above, since the support of the upper and lower work rolls 3°12 is stable, it is possible to use work rolls with a wide range of concave diameters (to 4, it is possible to use a small diameter range: twice the diameter). For example, 30φ to 60φ), it is therefore applicable to high loaf reduction rates and multi-product rolling, and it is easy to change over from a 4H1 mill, and the rolling mill can be downsized.

Further, by supporting the rolling force by the large-diameter printing roll 1.10, it is possible to control the degree of rust with a high degree of rust in the [1-rule gap].

As mentioned above, when using small-diameter work rolls, the lateral rigidity of the small-diameter work rolls can be increased if the roll configuration is pyramid-shaped and only crown adjustment can be performed using split backup rolls. However, shape controllability deteriorates. To solve these problems, by horizontally supporting the upper and lower work rolls 3 and 12 from the upstream and downstream sides of the pass line 5, horizontal bending is prevented, and the horizontal bending of the lower work roll 12 is prevented.
Double push horizontal bending by IB, 19 and vertical bending cylinder 20.2 of upper and lower intermediate rolls 2, 11
By vertical bending by 1, the shape 1t11111
In addition, by shifting the intermediate roll in the axial direction, the lateral rigidity can be increased. Therefore, overall performance can be significantly improved.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and that the structures of the horizontal bending device, shift device, split backup roll, etc. can be modified in various ways, and that the growth (up and down that sandwich the pass line) can be reversed. Of course, it is necessary that various modifications may be made without departing from the gist of the invention.

[Effects of the Invention] As described above, according to the multi-high rolling mill of the present invention, since the upper and lower work rolls are supported from both upstream and downstream sides of the pass line, fluctuations in horizontal deflection of the upper and lower work rolls can be prevented. Advanced shape control can be achieved by horizontally bending one of the work rolls, which further promotes the reduction in the diameter of the work roll, making it possible to roll difficult-to-process materials. Since the upper and lower intermediate rolls are vertically bent and shifted in the opposite direction, it is possible to increase lateral rigidity and further improve shape controllability.Moreover, by making the upper and lower work rolls chockless, the structure can be simplified and downsized, and the roll This can provide an excellent effect of improving work efficiency such as rearranging.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the present invention, and FIG. 2 is a side view showing one embodiment of the present invention.
Fig. 3 is a view taken from the ■-■ arrow in Fig. 1, Fig. 4 is a view taken from the IV-IV arrow shown in Fig. 1, and Fig. 5 is an example of a conventional multi-high rolling mill. Fig. 6 is a side view showing vi of Fig. 5.
-vr arrow view, FIG. 7, and FIG. 8 are side views showing other conventional multi-stage rolling machines, respectively. 1 is the upper backing roll, 2 is the upper intermediate roll, 3 is the upper work roll, 5 is the pass line, 6 and 7 are the press load, 8 and 9 are rolls to the support 1, 10 is the lower backing roll, 11 is the lower intermediate roll Roll, 12 is the lower work roll, 14゜15 is the supporting roll, 1
6.17 is a split backup roll, 18 is a horizontal bending jack, 19 is a horizontal bending cylinder, 2
0.21 is a vertical bending cylinder, and 22.23 is a shift device.

Claims (1)

[Claims] 1) One of the small-diameter work rolls, which are arranged to sandwich the pass line and supported by bearings that are not constrained in the rolling direction, is supported by one intermediate roll backed up by a large-diameter backing roll, and the upper and lower sides of the pass line are The horizontal bending device is directly supported by a support roll arranged on the side, and the other small diameter work roll is supported by the other intermediate roll backed up by a large diameter backing roll, and the horizontal bending device is arranged upstream and downstream of the pass line. The intermediate rolls are supported by a split backup roll having a supporting roll so as to be able to push horizontally in both directions, and both intermediate rolls are further provided with a vertical bending cylinder for performing vertical bending and a shift device for shifting in the opposite direction at the same time. A multi-high rolling mill featuring: