JPH01210107A - Rolling mill - Google Patents

Abstract

PURPOSE:To impart a large horizontal bending to a work roll by imparting a convex roll crown to a lateral bending roll, to an intermediate roll for horizontal bending, and to a work roll giving horizontal bending. CONSTITUTION:A lateral bending roll 6 is pushed to an intermediate roll 7 by hydraulic cylinder 5 so that the roll 7 imparts horizontal bending to an small upper work roll 1. A convex roll crown is formed on the respective rolls 6, 7, and 1. Therefore, a concentrated load is acted on the rolls 7 and 1, a horizontal bending of the roll 1 is increased to a sufficient amount and a vertical bending amount is also increased because both ends of the roll 1 are not disturbed by an upper backup roll 3 for bending. Therefore, a roll crown control function of the roll 1 is improved, so that a rolled stock having an optional sectional shape is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rolling mill capable of imparting large horizontal bends to work rolls.

[Prior art] An example of a four-high rolling mill among conventional rolling mills that horizontally bend work rolls to control the crown is shown in Figs. The rolls include a large-diameter lower work roll 2, an upper backing roll 3, and a lower backing roll 4, and the small-diameter upper work roll 1 is offset by a predetermined amount toward the exit side of the rolling mill.

A lateral bending roll 6 that can move forward and backward in the horizontal direction by a fluid pressure cylinder 5 is disposed on the rolling machine outlet side of the small diameter upper work roll 1, and a horizontal bending roll 6 is provided between the lateral bending roll 6 and the work roll l. intermediate roll 7
is intervening. The lateral bending roll 6 and the intermediate roll 7 are parallel to each other roll, and the small diameter upper work roll 11, the lateral bending roll 6 and the intermediate roll 7 are parallel to the upper backing roll 3, the lower large diameter work roll 2, and the lower backing roll. Like roll 4, it has a cylindrical shape without a crown.

An example of a 5-high rolling mill that performs crown control by applying horizontal bending is shown in FIG. They have almost the same configuration.

When rolling is performed using each of the above-mentioned rolling mills, the fluid pressure cylinder 5
The lateral bending roll 6 is pressed against the intermediate roll 7, and the intermediate roll 7 applies horizontal bending to the small-diameter upper work roll 1, thereby rolling the rolled material S.

Due to the horizontal bending of the small-diameter upper work roll l, the axis of the small-diameter upper work roll l becomes as shown by the curve A in FIG. and as shown by the two-dot chain line, it differs depending on the position in the roll axis direction. Therefore, the small-diameter upper work roll l is also bent in the vertical direction. Therefore, by controlling the horizontal bending of the small-diameter upper work roll l, the vertical bending of the small-diameter upper work roll l is also controlled, and as a result of controlling the roll crown, the cross-sectional shape of the rolled material is controlled.

[Problem to be Solved by the Invention] However, in the conventional rolling mill, as mentioned above, the lateral bending roll 6, the intermediate roll 7, and the small-diameter upper work roll l are cylindrical like the upper backing roll 3, the intermediate roll 8, etc. Therefore, even if the lateral bending roll 6 is pushed, a distributed load acts on the intermediate roll 7, and a distributed load also acts on the small-diameter upper work roll l, so that sufficient horizontal bending cannot be applied to the small-diameter upper work roll 1. In addition, when applying horizontal bending to the small diameter work roll l, if the amount of bending becomes large,
100% of the reaction force is no longer generated in the work roll chock, and both ends of the upper holding roll 3 share a part of the reaction force, and the small diameter upper work roll l cannot be fully bent. Therefore, in the conventional rolling mill described above, it was not possible to apply a large horizontal bend to the work roll.

The present invention has been made in view of the above-mentioned circumstances, with the object of imparting a large horizontal bend to a work roll.

[Means for Solving the Problems] The present invention provides a method for applying horizontal bending to either one of the upper and lower work rolls in contact with a backing roll or an intermediate roll via a lateral bending roll and an intermediate roll for horizontal bending. This rolling mill has a structure in which a lateral bending roll, an intermediate roll for horizontal bending, and a work roll for applying horizontal bending are provided with a convex roll crown.

[Function] During rolling, horizontal bending is applied to a predetermined work roll via a lateral bending roll and an intermediate roll for horizontal bending. Since the work roll has a convex roll crown, a concentrated load acts on both ends of the work roll, and the bending of both ends of the work roll is not hindered by the backing rolls or intermediate rolls with which the work roll comes into contact when horizontally bending. Therefore, a large horizontal bending can be applied to the work roll, and by extension, a large vertical bending of the work roll can also be applied.

[Example] Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention, which basically has approximately the same structure as the conventional one shown in FIGS. 2 and 3, including a small diameter upper work roll 1, a lateral bending roll 6, The intermediate rolls 7 for use are each provided with a convex roll crown.

In such a rolling mill, the lateral bending roll 6 is pressed against the intermediate roll 7 by the fluid pressure cylinder 5, and the intermediate roll 7 applies horizontal bending to the small diameter upper work roll l.
Since each roll 8.7.1 has a convex roll crown, a concentrated load acts on the intermediate roll 7 and the small-diameter upper work roll 1, and during horizontal bending, the small-diameter upper work roll 1
Since both ends are not prevented from bending by the upper hold-down roll 3, the horizontal bending of the small-diameter upper work roll l becomes sufficiently large, and by extension, the vertical bending also becomes large. Therefore, the roll crown control function of the small-diameter upper work roll 1 is improved, and a rolled material S having an arbitrary cross-sectional shape can be obtained.

In addition, in the embodiments of the present invention, the case where the upper work roll is used as the work roll that provides horizontal bending is explained, but it is also possible to apply horizontal bending to the lower work roll or both upper and lower work rolls. The work rolls may be of large diameter rather than small diameter, and can be applied not only to 4-high rolling mills but also to 5-high rolling mills with intermediate rolls between small-diameter work rolls and backing rolls. Of course, various other changes may be made without departing from the gist of the present invention.

[Effects of the Invention] According to the rolling mill of the present invention, it is possible to give a large horizontal bend to the work roll, so it is possible to obtain a rolled material with an arbitrary cross-sectional shape, and therefore, a high-quality product can be obtained. A full-time employee can produce excellent results.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an embodiment of the rolling mill of the present invention, Fig. 2 is an explanatory diagram of a four-high rolling mill among conventional rolling mills, and Fig. 3 is an illustration of the vicinity of the small-diameter upper work roll of the rolling mill shown in Fig. 2. FIG. 4 is an explanatory diagram of a five-high rolling mill among conventional rolling mills. In the figure, 1 is a small-diameter upper work roll, 2 is a large-diameter lower work roll, and 3 is a small-diameter upper work roll.
4 is an upper backing roll, 4 is a lower backing roll, B is a lateral bending roll, and 7 is an intermediate roll for horizontal bending.

Claims (1)

[Claims] 1) In a rolling mill that is capable of applying horizontal bending to either one of the upper and lower work rolls in contact with a backing roll or an intermediate roll through a lateral bending roll and an intermediate roll for horizontal bending, the lateral bending roll and the horizontal A rolling mill characterized in that a convex roll crown is attached to an intermediate roll for bending and a work roll for horizontal bending.