JPS6016284B2 - rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling mill for rolling a strip of material.

This type of rolling mill, for example as shown in FIG.
A pair of work rolls 1 and 2 for rolling the material strip
and respective backing rolls 3 and 4 which are in contact with the respective work rolls 1 and 2 and receive the rolling force thereof, and both roll shaft portions la, lb and 2a, 2b of the respective work rolls 1 and 2 are provided. By the bearing boxes 5a, 5b and 6a, 6b, both roll shafts 3a of the respective backing rolls 3 and 4 are
, 3b and 4a, 4b to bearing boxes 7a, 7b and 8a
, 8b, respectively, in a so-called four-high rolling mill, each roll axis la,
The rolling torque is transmitted from each input shaft 9, 10 which is coupled to each shaft end of the lb.

The torque transmitted to each of these work rolls 1 and 2 is limited by the diameter of each roll shaft portion la and lb and the size of each bearing box 5a and 6a that supports these. That is, generally the work rolls 1 and 2 have the same shape for compatibility, and the bearing boxes 5a, 5b and 6a,
6b is also common, and the diameters of the roll shaft parts la, lb and 2a, 2b and the bearing boxes 5a, 5b and 6a,
The size of the rolls 6b is made as large as possible to withstand the load, but on the other hand, the work rolls 1 and 2 suffer from surface roughness and pitting due to rolling, so they must be re-polished from time to time. Therefore, the maximum and minimum diameter ranges for use are limited.

In particular, the height h of the bearing boxes 5a, 5b and 6a, 6b between these work rolls 1 and 2 is limited to the minimum height that can be used.
,, h3 has a minimum diameter of d, radius d,/2, la/2
This is because the heights h, , , of the bearing boxes 5a, 5b and 6a, 6b must be smaller than
The fact that h2 is limited means that the roll shaft portions la, lb
This means that the koji diameter of the bearing boxes 55a, 5b and 6a is also limited, which affects the permissible transmission torque due to the diameter of the roll shaft.
, 6b from the heights h, , h2 of these work rolls 1 and 2.
As a result, the number of times the roll can be used and, ultimately, its service life are shortened. In order to improve such conventional drawbacks, the present invention provides a rolling mill in which rolling torque is transmitted to one or both of at least one end side roll shaft portion of a pair of opposing work rolls.
The bearing boxes that support the roll shafts facing each other are arranged with their shaft support positions shifted so that they do not interfere with each other, and at least the work rolls on the roll shaft side that transmit rolling torque are arranged so that they do not interfere with each other. The diameter of the roll shaft can be expanded by making the height of the roll shaft from the center of the bearing box larger than the radius.

Embodiments of the rolling mill according to the present invention will be described in detail below with reference to FIGS. 2 to 7.

FIG. 2 shows an embodiment of the present invention, in which 11 and 12 each represent a roll shaft portion 1.
A pair of opposing work rolls 13 and 14 corresponding to the work rolls 1 and 2 have roll shaft portions 13a and 13b, respectively.
and 14a, 14b, corresponding to the backing rolls 3 and 4, and 15a, 15
b and 16a, 16b are the respective roll shaft portions 11a, 1
1b and 12a, a bearing box that pivotally supports 12b, 17a,
Similarly, 17b, 18a, 18b are bearing boxes for pivotally supporting the respective roll shafts 13a, 13b and 14a, 14b;
This is an input shaft coupled to each shaft end of a. However, in the embodiment shown in FIG. 2, the present invention prevents the bearing boxes 15a and 16a and 15b and 16b supporting the roll shafts la and 2a and lb and 2b facing each other from interfering with each other. The shaft support positions are shifted so that the bearing boxes 15a and 16b are on the inside and the bearing boxes 15b and 16a are on the outside, and the minimum diameter of each work roll 11 and 12 is set to D. , and D2, each bearing box, especially the roll shaft portions 11a and 12 on the side that transmits the rolling torque coupled to the input shafts 19 and 20.
The height from the axis of the rattan receiver boxes 15a and 16a in a is
and day 2, day, ≧D, /2, day 2≧D2/
The minimum diameter of each work roll 1, 2 and the height with respect to the bearing boxes 15a, 15b and 16a, 16b are set so that the ratio is 2.2/2 and D.102/2.

Therefore, in the above configuration, each of the opposing bearing boxes 15a and 16a
The bearing boxes 15b and 16b are offset from each other so that they do not interfere with each other, and as a result, the height from the axis can be increased. The shaft diameters of the roll shafts 11a, 11b and 12a, 12b supported by the work rolls 11 and 16b can be enlarged, and the rolling torque transmitted to the work rolls 11 and 12 can be greatly increased. By reducing the minimum diameter of the roll, the number of times the roll can be used and, ultimately, the life of the roll can be extended, which helps reduce the unit price of the roll.

Furthermore, in this embodiment, the work rolls 11 and 12 are constructed symmetrically, so that they are compatible and are even more effective. Furthermore, the permissible rolling torque transmission described above is as follows:
Each roll shaft portion 11a, lib of each work roll 11, 12
In addition to the diameters of the shafts 12a and 12b, the thickness S of the coupling portions 19a and 20a of the input shafts 19 and 20,
, S2.

Therefore, in the present invention, as shown in the embodiment in FIG. 3, if necessary, these coupling portions 19a, 20a are also adjusted in their coupling positions so as not to interfere with each other, as described above. Shift, D, 10 D2 Mi S, 10 S
By setting it to 2, the input shaft capacity can be increased.

Also in this case, as is clear from the figure, compatibility can be achieved by configuring the work rolls 11 and 12 symmetrically. Further, if it is desired to transmit even larger torque to one of the work rolls, the embodiment shown in FIG. 4 may be used.

In other words, as explained in the above embodiment, the shaft diameter of the work roll can be increased by shifting the positions of the bearing boxes of the upper and lower work rolls, but the height of the bearing box of one work roll (from the center of the bag) can still be increased. height) is limited by the radius r of the other work roll axis. (day ten r<D,
(must be 10D2/2).

Therefore, for example, if it is desired to transmit a larger torque to the upper work roll 11, the drive side shaft diameter r of the lower work roll 12 is made smaller as shown in the embodiment in FIG. Diameter R and its bearing box height,
In this case, even larger torque can be transmitted to the upper work roll 11. In the embodiment shown in FIG. 4, the non-drive side shaft diameter of each work roll 11, 12 is in the opposite relationship to the drive side shaft diameter, and the upper and lower work rolls 11, 12 are made symmetrical to ensure compatibility. ing. Furthermore, the arrangement of the bearing boxes 15a and 15b and 16a and 16b does not necessarily have to be symmetrical as in the previous example, but as shown in the embodiment in FIG. Both 16a and 16b may be outside (or vice versa); in this case,
If the pivot support position is fixed, compatibility cannot be obtained, but as shown in FIGS. 6 and 7, by making the pivot support position changeable, compatibility can be provided as in the previous example.

Furthermore, in each of the above embodiments, the pair of work rolls 11,
Although rolling torque is introduced into each of 12,
In this way, the rolling torque may be introduced from one side or both sides instead of from both sides. For example, if it is introduced only from the work roll 11 side, day, ≧D, /2, day2
≦D2/2, day, ten ratio ZD, ten D2/2.

Although each of the above embodiments describes a four-tiered roll configuration,
It can also be applied to other 2-, 5- or 6-stage roll configurations, and in the case of multiple stands, it is possible to apply only the appropriate stands.

As detailed above, according to the present invention, the opposing one
In a rolling mill in which rolling torque is transmitted to one or both of the roll shafts on at least one end of a pair of work rolls, the ratchet boxes of each opposing roll shaft are arranged so that they do not interfere with each other. A roll that transmits rolling torque by having a staggered rattan dominant layer and at least a height of the roll shaft section from the ball center of the bearing box that is larger than the radius of the work roll on the side of the roll shaft section that transmits the rolling torque. Since the shaft diameter of the shaft part can be expanded, rolling torque can be greatly increased, and the rolling reduction can be increased, so a reversing rolling mill consisting of one stand can reduce the number of rolling steps during production. In addition, with a continuous rolling mill consisting of multiple stands, it is possible to plan equipment that reduces the number of required stands, or to increase the thickness of the material plate, or to reduce the thickness of the finished plate. Furthermore, if the rolling torque introduced is the same as before, the diameter of the work roll can be made smaller as a result), which reduces the number of times the roll is used.
Furthermore, it has the advantage of being able to extend the life of the roll, thereby making it possible to reduce the unit price of the roll.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an overview of the roll configuration of a conventional rolling mill, FIGS. This figure and FIG. 7 are enlarged sectional views of the shaft support of the embodiment shown in FIG. 11, 12... 1 pair of work rolls, 11a, 1
1b and 12a, 12b... roll shaft part as above, 13, 14... back roll, 13a, 13b and 14a, 14b... roll shaft part as above, 15a, 1
5b and 16a, 16b... Bearing box of work roll, 17a, 17b and 18a, 18b...・・・
・Bearing part of the backing roll, 19, 20... Input shaft, 19a, 20a... Coupling part. Figure 6 Figure 7 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. In a rolling mill configured to transmit rolling torque to one or both of the roll shafts on at least one end side of a pair of opposing work rolls, the bearing boxes that pivotally support the opposing roll shafts are mutually connected. The shaft support position is shifted to avoid interference, and at least the radius of the work roll on the roll shaft side that transmits the rolling torque is
A rolling mill characterized in that the diameter of the roll shaft can be increased by increasing the height of the roll shaft from the center of the bearing box.