JPS60166103A - Rolling method of billet or bar-wire rod - Google Patents

Abstract

PURPOSE:To simplify the driving system of a rolling mill line and to reduce the initial investment of the mill line and its manufacturing cost by providing nondriven mill stands to the line of tandem arranged rolling mills and performing a force-in rolling and a draw-out rolling by the adjoining motor-driven mills. CONSTITUTION:In a line of tandem arranged mills of billet or bar.wire rod, formed by arranging five sets of two-high horizontal mills in series; three sets of mill stands of the 1st and last mill stands 11-1, 11-5 and an intermediate stand 11-3 are provided with motors M1, M2, M3 respectively and are driven independently, and two sets of mill stands of the 2nd and 4th ones are made to be nondriven types. Thus, the mill line is made to perform force-in rollings at the 2nd and 4th nondriven rolls W2, W4 by the driving rolling rolls W1, W3 and further draw-out rollings by the driving rolls W3, W5, thereby simplifying the driving system of the mill line.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a method for rolling steel billets or steel bars/wire rods using rolling mills arranged in a tandem arrangement.

Prior art and its problems Conventional methods for rolling steel billets, steel bars, and wire rods using a tandem rolling mill include a horizontal tandem rolling mill shown in Figure 1 (81, (b)), or a horizontal tandem rolling mill shown in Figure 1 (C ) The horizontal-vertical tandem rolling mill shown in Figure 1(a) and (b) is a method using a horizontal-vertical tandem rolling mill. The rolling mills are arranged in series, and each rolling mill is driven by a dedicated motor (as shown in (a)).
A method is adopted in which the rolling mills (3) are driven individually in 2), or a method in which a plurality of rolling mills (3) are commonly driven by one motor (4) as in (b). In addition, the horizontal-vertical tandem rolling mill shown in Fig. 1(C) has a plurality of horizontal double rolling mills (1) and vertical rolling mills (5) arranged in series alternately, and each rolling mill is controlled by a motor ( 2) The method of driving independently in (6) is common.

However, in the case of an independent drive system in which horizontal-vertical tandem rolling mill rows are operated and each rolling mill is driven by a dedicated motor, the power transmission device is particularly complicated for vertical rolling mills, and the equipment cost is high. In this case, accidents tend to occur because water and scale enter the drive system of the reducer, etc., and maintenance is not easy.In addition, the upper drive system has drawbacks such as difficulty in handling rolls, guides, etc.

In addition, even in rolling mill rows where horizontal rolling mills are arranged in series, there are many accessories such as spindles and couplings, so it is necessary to have many spares, and in addition, a reducer and motor are attached to each rolling mill. In this case, equipment costs are high.

Therefore, the manufacturing cost of billets, steel bars, and wire rods is high with conventional rolling methods using an individual drive system in which each rolling mill is driven by a dedicated motor, or a tandem rolling mill with a common drive system in which multiple stands share a drive motor. I didn't like it.

Purpose of the Invention The present invention was made to address the above-mentioned conventional problems, and aims to reduce equipment costs by simplifying the drive system of a tandem rolling mill, thereby reducing manufacturing costs for billets, steel bars, and wire rods. The purpose of this study is to propose a rolling method that can reduce the

DISCLOSURE OF THE INVENTION The method for rolling steel billets, steel bars, and wire rods according to the present invention comprises rolling of one or more intermediate rolling mill stands other than the first rolling mill stand and the last rolling mill stand in a tandem rolling mill row. This method is characterized in that the mill stand is not driven, and a driving rolling mill adjacent to the non-driving rolling mill performs indentation rolling and drawing rolling.

The rolling method for steel billets, steel bars, and wire rods involves ■ Rolling two materials at the same time.
A discontinuous type in which the rolled material does not get stuck in the rolling mill (and the rolling direction changes with each pass); ■ A semi-continuous type in which the rolled material is free between the rolling mill groups by a combination of discontinuous and continuous rolling mills; There is a fully continuous type in which the rolling direction is constant and the rolled material does not become free between rolling mills, but the main type of rolling equipment currently in operation is the fully continuous tandem type arrangement. In the case of a tandem rolling mill row, rolling is possible without necessarily driving all the rolling mills in the rolling mill row except the first and last rolling mills. This is because the rolled material does not become free, so if the rolling F ratio (or area reduction ratio) and rolling mill interval are set appropriately, push rolling and drawing rolling can be performed using a driven rolling mill even if the rolling mill is partially non-driven.

This invention is a method for rolling steel billets, steel bars, and wire rods using the above-mentioned push rolling and pull rolling. The method is to perform push rolling and pull rolling using adjacent drive rolling mills.

Hereinafter, the rolling method of the present invention will be explained based on FIG. 2.

FIG. 2(a) shows a method using a single-drive horizontal tandem rolling mill, in which five double-layer horizontal rolling mills are arranged in series for tandem rolling. This method is
In addition to the first rolling mill stand (11-1) and the last rolling mill stand (11-5), the third rolling mill stand (
The three rolling mill stands (11-3) are independently driven by motors (M+) (M2) (M, ), and the second rolling mill stand (11
-2) and the fourth rolling mill stand (11-4) are not driven. 7j That is, the second non-driven rolling roll (W2) is the first driven rolling roll (W, ).
The indentation rolling is performed by the third driven rolling roll (W3), and the fourth non-driven rolling roll (W) performs the indentation rolling by the third driven rolling/coal (W3). is carried out, and drawing rolling is carried out by the last driven rolling roll (W,).

Furthermore, Fig. 2(b) shows a method using a horizontal-vertical tandem rolling mill in which multiple rolls are commonly driven by one motor; This is a tandem rolling method in which the mills are arranged alternately. In this method, the first rolling mill stand (12-1), the last rolling mill stand (December-July), and the third and fifth
The 4th rolling mill stand (12-3) (12-5) is the drive system, and the 2nd, 4th, and 6th rolling mill stands (12-2) (12-4) (12-6) is not driven. In other words, in the case of this horizontal-vertical tandem rolling mill with a common drive system, the motor (M4) drives the four horizontal rolling rolls (12-1) (12-3) through the gears (G,) ((Q). ) (12-5) (12-7)
In this method, the second non-driven vertical rolling roll (P,) performs intrusion rolling and pull rolling by the first driven horizontal rolling roll (W,) and the third driven horizontal rolling roll (W,). and the fourth non-driven vertical rolling roll (
P,), the third and fifth driven horizontal rolling rolls (Wl
) (Push rolling and drawing rolling are performed by W rolling, 6
The fifth and last driven horizontal rolling roll (Wl) performs indentation rolling and drawing rolling on the fifth non-driven vertical rolling roll (P,).

Furthermore, Fig. 2 (C) shows a method using a single-drive horizontal-vertical tandem rolling mill, in which three horizontal rolling mills and two vertical rolling mills are arranged alternately to perform tandem rolling. be. In this method, the first rolling mill stand (11-1), the third rolling mill stand (11-3), and the last rolling mill stand (11-5) are driven independently, and the second and fourth rolling mill stands rolling mill stand (12-2) (
12-4) is not driven. That is, on the second non-driven vertical rolling roll (P,), indentation rolling and drawing rolling are performed by the first and third driven horizontal rolling rolls (Wl) (Wl), and on the fourth non-driving vertical rolling roll (P, ), the third and last driven horizontal rolling roll (W
x) Push rolling and drawing rolling are performed by (w, ).

In addition, when implementing this invention method, the distance between the non-driving rolling mill of the tandem rolling mill and the driving rolling mill on the upstream side thereof is as follows:
It is desirable to make the length shorter than in a normal all-rolling mill drive system, or to strengthen the id trough between the same rolling mills to prevent buckling of the rolled material.

The method of this invention is as described above (i.e., one or more rolling mills in the intermediate rolling mills excluding the first and last rolling mills in a row of rolling mills in a tandem arrangement are made non-driving, and indentation rolling is carried out by a driven rolling mill. Since this is a drawing rolling method, equipment costs and maintenance costs are greatly reduced by reducing the drive system of the rolling mill.In particular, if the vertical rolling mill is made non-driving, the effect is extremely large.・The manufacturing cost of the wire rod is low.Furthermore, it is easy to perform setup changes such as changing rolls and changing guides, which greatly improves work efficiency and increases the operating rate.

As explained above, according to the method of the present invention, great economic effects can be achieved in tandem rolling of billets, steel bars, and wire rods, and productivity can be improved by increasing the operating rate.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the conventional tandem rolling method for steel billets, steel bars, and wire rods. Figure (a) is a rolling method using a horizontal tandem rolling mill with an independent drive system, and Figure (b) is a rolling method using a horizontal tandem rolling mill with a common drive system. A rolling method using a type rolling mill (C1 is a rolling method using an independent drive type horizontal-vertical tandem rolling mill, and FIG. 2 is an explanatory diagram of a tandem rolling method for billets, bars, and wire rods according to the present invention. (a) is a method using a horizontal tandem rolling mill with an independent drive system, Figure (b) is a method using a horizontal-vertical tandem rolling mill with a common drive system, and (cl is a horizontal-vertical tandem rolling mill with an individual drive system) This is the method according to 11-1.11-3.11-5.12-1.12-3.
11-7...Independently driven horizontal rolling mill stand, 1
1-2.11-4...Non-driven horizontal rolling mill stand,
12-2.12-4...Non-driven vertical rolling mill stand, W1-W,...Driven horizontal rolling roll, PI + P
I + PM...Non-driven vertical rolling roll, M,, M
,,M,, M4...Motor. Applicant: Sumitomo Metal Industries, Ltd. Figure 1 (0) bl cl bl (C1

Claims (1)

[Claims] One or more rolling mill stands in an intermediate rolling mill stand other than the first rolling mill stand and the last rolling mill stand in a tandem arrangement rolling mill row for steel billets or steel bars/wire rods are non-driving, and non-driving rolling is performed. A method for rolling steel billets, steel bars, or wire rods, which is characterized by performing indentation rolling and drawing rolling using a drive rolling mill adjacent to the mill.