JPS6033561B2 - rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a rolling mill for rolling a material strip.

[Conventional technology]

This type of rolling mill has a pair of work rolls 1 and 2 for rolling a material strip, and backing rolls 3 and 4 that are in circumferential contact with both work rolls 1 and 2 and receive rolling force. Roll both end shaft parts la, lb, 2a of rolls 1 and 2,
2b is pivotally supported by bearing boxes 5a, 5b, 6a, 6b, and the roll both end shaft portions 3a, 3b, 4 of the retaining rolls 3, 4
A so-called four-high rolling mill is known, as shown in FIG. 1, in which the rollers a and 4b are supported by bearing boxes 7a7b, 8a, and 8b.

[Important problem that the invention attempts to solve]

In the above-mentioned rolling mill, torque for rolling is transmitted from an input shaft 10 connected to the end of the roll shaft portion la of one work roll 1 via a coupling 9. In this case, the torque transmitted to the work roll 1 is limited by the size of the roll shaft portion la of the work roll 1 and the size of its bearing box 5a.

That is, in general, the work rolls 1.2 have the same shape and the same dimensions to provide compatibility, and the bearings (not shown) of the bearing boxes 5a, 5b, 6a, and 6b are also common, so that the inner and outer parts are the same. In addition to the same dimensions, the diameters of the roll shafts la, lb, 2a, 2b and the bearing boxes 5a, 5
The inner and outer diameters of the bearings b, 6a, and 6b are made as large as possible to withstand the load, but on the other hand, surface roughness, pitting, etc. occur on the work rolls 1 and 2 due to rolling. Since the rolls 1 and 2 are reground and used as needed, the roll diameter becomes small, but the maximum diameter used depends on the dimensions of the roll shaft, especially the bearing boxes 5a, 5b, 6a, 6b that hold the bearings. It is limited by the height dimension (height h from the center of the bearing to the outer surface of the axle box).

That is, the rolls 1 and 2 and the ball box parts are made as compatible as possible, the dimensions of the roll shaft are determined so that the torque transmitted to the rolls is maximized, and the load capacity of the ball box is determined. In order to make it as large as possible,
Roll shaft parts la, lb, 2a, 2b of work rolls 1 and 2
The diameter dimensions of the bearing boxes 5a, 5b, 6a, and 6b are designed to have the same dimensions.

On the other hand, when the work rolls 1 and 2 have the minimum diameter, the design is such that the upper and lower bearing boxes 5a, 6a and 5b, 6b do not come into contact with each other. In order to satisfy the above requirements, bearing boxes 5a, 6a,
and the height of 5b, 6b h. ≠h2, and the minimum roll diameter is designed as d, 10d2>h, /20h2/2. In this way, when the heights h, 2 of the bearing boxes 5a, 6a, 5b, 6b are limited in design, the shafting of the roll shafts la, lb, 2a, 2b is also limited. This means that the permissible transmission torque is also limited by the diameter of the roll shaft.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides a rolling mill in which rolling torque is transmitted to at least one roll shaft end of the work rolls. Let D be the height of the bearing box from the center of the bearing to the outer surface of the axle box. , the minimum diameter of the other work roll facing this work roll is D2, and the height from the center of the bearing box to the outer surface of the axle box is D, ±D.
2 or ○, when = 02, day,>D. /2, day 2<
By setting the minimum diameter of each work roll and the height of the bearing box so that D2/2, day, 10 days 2 < (D, 102)/2, the work rolls that transmit rolling torque can be This work roll is characterized by having a roll shaft depression larger than the shaft portion of the other work roll.

[Embodiments of the Invention] Hereinafter, embodiments of a rolling mill according to the present invention will be described with reference to the drawings of FIGS. 2 and 3.

In the figure, 11 and 12 are a pair of work rolls having roll shaft portions 11a, 11b and 12a, 12b at both ends; 13, 14;
has roll shaft parts 13a, 13b and 14a, 14b at both ends.
The roll shaft portions 11a, libs 12a, 12b of the work rolls 11, 12 are
5a, 15b, 16a, 16b, and the roll shaft portions 13a, 13b, 14a, 1 of the backing rolls 13, 14.
4b is pivotally supported by bearing boxes 17a, 17b, 18a, 18b as shown in FIG.

Therefore, the present invention has the following advantages: the minimum diameter of one work roll 11 that transmits the rolling torque is D, and the diameter of the other work roll 12 is 4.
・The diameter is D2, and the height from the bearing center of the bearing box 15a that supports the roll shaft part 11a to which the input shaft 19 is coupled to the outside surface of the ball box is 1. The height from the bearing center of the bearing box 16a that supports the roll wisteria part 12a of the roll 12 to the outer surface of the shaft box is 2,
When D,≠D2 or D,=D2, day,>D,/2
, day 2<○2/2, day. By setting the minimum diameter of each work roll and the height of the bearing box so that 10 days 2 < (D, 10D2)/2, the roll shaft diameter ○1a of the work roll 11 is set to the other work roll. It is characterized in that the diameter of the roll 12 is larger than the diameter ○2a of the roll 12.

In addition, the height from the bearing center to the outer surface of the rattan box of the bearing boxes 15b, 16b that support the roll shaft parts 11b, 12b on the opposite side is symmetrical to the height of the bearing boxes 15a, 16a, 2, 2, That is, the height of the bearing box 15b is 2, and the height of the bearing box 16 is
The height of b is set to day. With the above structure, the bearing box 15a can be made larger by the size of the opposing bearing box 16a, and therefore the shaft center of the roll shaft portion 12a supported by the koji receiving box 16a can be made smaller.
2a has a diameter of 4 mm, which is the diameter D1a of the roll shaft portion 11a supported by the bearing box 15a and to which the rolling torque is transmitted.
can be used as a large diameter, and from the input shaft 19 to the work roll 1
The rolling torque transmitted to No. 1 can be increased to a large extent.

In addition, when the transmission torque is the same as that of the conventional mill, the unregistered dimension on the driving side of the rolling mill is d,=h, and the opposing ball box is set to d2<~, so that d・~<D・10 It can be D2. In this way, the technique of using the work roll is 4. The diameter is 4.
By reducing the roll length, it is possible to improve the usage of the roll, extend the life of the roll, and help reduce the unit price of the roll itself.

Furthermore, in this embodiment, since the work rolls 11 and 12 are constructed symmetrically, there is compatibility, and this embodiment is even more effective. In the embodiment described above, rolling torque is introduced into one work roll 11 only from the roll shaft 11a side, but the rolling torque is applied to one work roll 11 only from the roll shaft 11a side.
2 can be driven at the same time, an input shaft may be connected to the roll shaft portion 12b side of this work roll 12 to introduce rolling torque.

Furthermore, if we ignore the compatibility of both work roles 11 and 12,
Of both roll shaft portions 11a, 11b and 12a, 12b, only the side to which rolling torque is introduced, that is, the roll shaft portion 11a,
The present invention may be applied only to the 12a side and the other side, the roll shaft portions 11b and 12b, may be left as conventional, or alternatively, the bearing box 15a, which supports both the roll shaft portions 11a and 11b of the work roll 11, may be used. 15b both have a height, and bearing boxes 16a and 16b that support both roll shafts 12a and 12b of the work roll 12 have a height of 15b, and are connected to both end shafts 11a and 11b of the work roll 11. Of course, the rolling torque may be introduced by the input shafts 19, 19.

In addition, each of the small fleas D, D on the pair of work rolls 11 and 12
2 may be the same or slightly different, and the applicable rolling mills can be applied not only to 4-high rolling mills but also to 2-high, 5-high, 6-high rolling mills, etc., as well as to appropriate stands.

[Effects of the Invention] As detailed above, in this invention, in a rolling mill configured to transmit rolling torque to the shaft portion of at least one of a pair of work rolls, the minimum The height is D, the height from the center of the bearing of the bearing box to the outer surface of the box is 2, the minimum diameter of the other work roll facing this work roll is ○2, the height from the center of the bearing of the bearing box to the outer surface of the box. When the height of >D, /2,Q<
By setting the minimum height of each work roll and the height of the bearing box so that D2/2, day, ten wide (D.10D2)/2, the roll axis height of the work roll that transmits the rolling torque is Since the diameter of the ball is made larger than the diameter of the other work roll, it is possible to increase the rolling torque to a large extent, which makes it possible to reduce the number of rolling operations and increase production in a reversing rolling mill consisting of one stand. In addition, a continuous rolling mill with multiple stands allows equipment planning to reduce the number of required stands, and furthermore, when the rolling torque introduced is the same as that of conventional mills, the minimum diameter of the work rolls can be reduced as a result. As a result, the number of times the roll can be used and, ultimately, the life of the roll can be extended, and the unit price of the roll can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional rolling mill, FIG. 2 is an explanatory diagram showing a rolling mill of the present invention, and FIG. 3 is an enlarged sectional view of a main part of FIG. 2. 11, 12...Pair of work rolls, 11a, 1
1b and 12a, 12b... Roll shaft portion, 13, 14...
... Backup rolls, 15a, 15b and 16a, 16b...
...Work roll bearing box, 19...Input shaft, D,
, D2... Minimum diameter of work roll, day,, day 2...
...Bearing box height. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a rolling mill that transmits rolling torque to the shaft end of at least one of a pair of opposing work rolls, the minimum diameter of one of the work rolls that transmits rolling torque is D_1, from the bearing center of its bearing box. The height to the outer surface of the axle box is H_1, the minimum diameter of the other work roll facing this work roll is D_2, the height from the center of the bearing of the bearing box to the outer surface of the axle box is H_2, D_1≒D_2 or D_1=D
When _2, H_1>D_1/2, H_2<D_2
2. By setting the minimum diameter of each work roll and the height of the bearing box so that H_1+H_2<(D_1+D_2)/2, the roll shaft diameter of the work roll that transmits the rolling torque can be adjusted to the diameter of the other work roll. A rolling mill characterized by having a diameter larger than that of the shaft.