JPS5954401A - Rolling method - Google Patents

Abstract

PURPOSE:To improve the shape in the width direction of a plate by shifting work roll to the positions where the unbending at one end of the work roll is decreased or eliminated by roll which applies a roll bending curve on the work roll. CONSTITUTION:Upper and lower work rolls 1, 1' are axially shifted to position the ends of the rolls 1, 1' at the ends of a rolled material S and pressurized oil is applied in oil chambers 3, 3'. The peak of the roll 2 contacts with the left side part of the roll 1 and the right side part of the roll 1 deflects along the expansion curve of the roll 2. The peak of the roll 2' contacts with the left side end of the roll 1' and the left side end of the roll 1' deflects along the expansion curve of the roll 2'. Therefore, the rolls 1, 1' maintain the required curve without flattening in the parts in contact with both side parts of the material S, thus improving the shape of the material S.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling method that can reliably control the shape of a rolled material.

Examples of rolling mills that use variable crown rolls whose shells can be partially expanded as backup rolls or intermediate rolls include those shown in FIG. 1 or 2, for example.

In Fig. 1, a and a' are upper and lower work rolls, b and b' are upper and lower backup rolls, and the upper and lower backup rolls b and b' have oil chambers c and c' at approximately the center in the longitudinal direction of the body. ,
This is a variable crown roll in which the outer circumferences of oil chambers c and c' are expanded by pressure oil supplied from pipes d and d'.

When rolling the rolled material S in the above-mentioned rolling mill, as shown in FIG.
Apply roll bending to the material and perform rolling.

However, in the above rolling mill, the upper and lower work rolls a,
The bending along the shape of the upper and lower backup rolls b and b' is applied to the vicinity of the center of a', but the bending along the shape of the upper and lower backup rolls b and b' is not performed at both ends, and the upper and lower backup rolls b, There may be gaps c, c' between b' and the upper and lower work rolls a, a', or gaps c, c' may cause the upper and lower work rolls a,
Unbending of a' is performed.

Therefore, the roll bending curves of the upper and lower work rolls a and a' become gentle, and when rolling a narrow-width rolled material S, the corners on both sides of the rolled material S are rounded, and the widthwise direction of the rolled material S is rounded. It is not possible to improve the shape. As mentioned above, the unbending occurs in the upper and lower work rolls a and a' due to the expanding upper and lower backup rolls b and b.
′ coexists with an expansion part and a non-expansion part, and the upper and lower work rolls a, a
This is because both end portions of the rollers abut against the non-expandable portions of the upper and lower backup rolls b and b′, and receive a reaction force from the non-expandable portions.

In addition, in the rolling mill shown in Fig. 2, upper and lower backup rolls b,
The oil chambers c and c' of b' are provided on both sides in the longitudinal direction of the body. The outer circumferences of the upper and lower backup rolls b, b' are polished straight by applying pressure oil to the oil chambers c, c' to expand the outer circumferences of the oil chambers c, c', as shown in FIG. However, even in the case of a rolling mill that uses such upper and lower backup rolls b and b', the upper and lower work rolls a and a' do not form a roll bending curve along the upper and lower backup rolls b and b', and the rolled material has a narrow width. In the case of S, the shape in the width direction of the sheet cannot be made good as in the rolling mill shown in FIG.

The present invention was made for the purpose of improving the width of a rolled plate by rolling with a rolling mill using a variable crown roll as a backup roll or an intermediate roll.
A rolling mill equipped with a work roll that is freely shiftable in the axial direction and a roll that abuts against the work roll and imparts a roll bending curve to the work roll by expanding or contracting a part of the body. is shifted to a position where unbending of one end of the work roll by the roll imparting a roll bending curve to the work roll is reduced or eliminated.

Embodiments of the present invention will be described below based on the drawings.

FIG. 4 shows an embodiment of the present invention, in which 1 and 1' are upper and lower work rolls, 2 and 2' are upper and lower backup rolls, and the upper and lower work rolls 1 and 1' are moved toward the bottom by appropriate means (not shown). The oil chambers 3, 3' of the upper and lower backup rolls 2, 2' are provided approximately at the center in the longitudinal direction of the body, and the oil chambers 3, 3' are equipped with pipes 4, Pressure oil can be introduced from 4'.

During rolling, the upper and lower work rolls 1 and 1' are shifted in the axial direction so that the ends of the upper and lower work rolls 1 and 1' are located at the ends of the rolled material S, and pressure oil is applied to the oil chambers 3 and 3'. do. Then, as shown in Figure 4, the upper backup roll 2
The top of the lower work roll 1 hits the right side of the upper work roll 1, so the right side of the upper work roll 1 bends along the expansion curve of the upper backup roll 2, and the top of the lower backup roll 2' hits the left side of the lower work roll 1, so the lower The left side of the work roll 1' is bent along the expansion curve of the lower backup roll 2'. Therefore, the curves of the upper and lower work rolls 1, 1' in contact with both sides of the rolled material S are not gentle, and the rolled material S
The shape of can be improved.

Even if the shift direction of the upper and lower work rolls 1 and 1' is reversed to that described above, the same results will be obtained, only that the abutting positions of the tops of the upper and lower backup rolls 2 and 2' against the upper and lower work rolls 1 and 1' will be reversed left and right. It is possible to perform rolling into various shapes.

FIG. 5 shows another embodiment of the present invention, in which oil chambers 3, 3' are provided on both sides in the longitudinal direction of the upper and lower backup rolls 2, 2'. The straight part of the upper and lower backup rolls 2 and 2' is the third
It was created in the same manner as shown in the figure.

When rolling with such a rolling mill, the roll bending curve to both ends of the upper and lower work rolls 1, 1' is made by removing pressure oil from the oil chambers 3, 3' and contracting the oil chambers 3, 3'. The oil chambers 3, 3 or between the oil chambers 3', 3' of the upper and lower backup rolls 2, 2' are formed into a convex shape, and the convex portions apply the oil.

Fig. 6 shows still another embodiment of the present invention, in which the upper and lower backup rolls 2, 2' are made straight without supplying pressure oil to the oil chambers 3, 3', and during rolling, the upper and lower backup rolls 2, 2' are made straight without supplying pressure oil to the oil chambers 3, 3'. Pressure oil is sent to actively expand the upper and lower back-up rolls 2 and 2', thereby enlarging the roll bending curves at both ends of the upper and lower work rolls 1 and 1'. Such a rolling method also makes it possible to improve the shape of the rolled material S in the width direction.

In FIGS. 5 and 6, the same reference numerals as those shown in FIG. 4 indicate the same components.

The amount of shift in the axial direction of the upper and lower work rolls 1, 1' in each of the above-mentioned rolling operations is as follows: When the upper and lower work rolls 1, 1' are shifted, the upper and lower work rolls 1, 1 on the side closer to the width end of the rolled material S are shifted. The ends of ' are the upper and lower backup rolls 2, 2'
The position shall be such that it is not subject to bending and stapling, or is only slightly subject to bending and undoing. By shifting the upper and lower work rolls 1, 1' to such positions and rolling, the unbending of the upper and lower work rolls 1, 1' can be reduced or eliminated, and good rolling can be performed as described above. .

In addition, in the examples of the present invention, the case where the variable Claure roll is used as a backup roll of a 4-high rolling mill has been explained, but it is also possible to use it as an intermediate roll of a 5-high rolling mill or a 6-high rolling mill, and there are other possibilities. Of course, various changes may be made within the scope of the invention without departing from the gist of the invention.

According to the rolling method of the present invention, the unbending of the work roll can be eliminated or reduced, so the roll bending curve on both sides of the work roll can be increased, and therefore the shape of the rolled material in the width direction can be improved. can.

This effect is particularly noticeable in the case of narrow plates.

[Brief explanation of the drawing]

Figures 1 and 2 are explanatory diagrams of a rolling method using a conventional rolling mill, Figure 3 is an explanatory diagram of how to make a variable crown roll used in the rolling mill of Figure 2, and Figure 4 is an explanatory diagram of a method of making a variable crown roll used in the rolling mill of Figure 2. FIG. 5 is an explanatory diagram of one embodiment of the rolling method, FIG. 5 is an explanatory diagram of another embodiment of the rolling method of the present invention, and FIG. 6 is an explanatory diagram of still another embodiment of the rolling method of the present invention. In the figure, 1 and 1' are upper and lower work rolls, 2 and 2' are upper and lower backup rolls, 3 and 3' are oil chambers, and 4 and 4' are pipe lines. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd.

Claims (1)

[Claims] 1) In a rolling mill equipped with a work roll that can be freely shifted in the axial direction and a roll that abuts against the work roll and imparts a roll bending curve to the work roll by expanding or contracting a part of the body, the work A rolling method characterized by shifting a roll to a position where unbending of the work roll end by the roll imparting a roll bending curve to the work roll is reduced or eliminated.