JPS59144503A - Train of roll cross type tandem rolling mill - Google Patents

Abstract

PURPOSE:To reduce an installation, installation cost, the number of parts, and maintenance cost by crossing a work roll of one side fixed perpendicularly to the advancing direction of a rolling material and a work roll of the other side with each other. CONSTITUTION:In a train of roll cross type rolling mills where upper and lower work rolls are arranged in the rolling direction, and the crossings of adjoining pairs of rolls 11, 11' are inversely set; one of the rolls 11, 11', the roll 11', for instance, is fixed perpendicularly to the advancing direction of a rolling material. And the roll 11 is made slantable with respect to the roll 11'. That is, both ends of the roll 11' are supported by lower work roll chocks 13'a, 13'b and are fixed perpendicularly to the advancing direction of the material. On the other hand, both ends of the roll 11 are supported by upper work roll chocks 13a, 13b and are moved backward and forward by driving mechanisms 16a 16b, 17a, 17b through crossheads 14a, 14b, 15a, 15b.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a roll cross type tandem which aims to reduce equipment and construction costs and reduce maintenance costs by reducing the number of parts by adopting a single roll cross in which only one work roll is tilted. Regarding rolling mill rows.

Generally, when rolling plate materials such as road strips, a decrease in flatness (defective shape) may occur due to non-uniform elongation in the width direction.

Therefore, one technique for controlling the thickness distribution in the folding direction in the rolling process is to bend the rolling rolls to change the profile of the distribution in the width direction of the gap through which the plate material passes.

However, the control of the thickness distribution of the plate material in the IJ force direction by roll bending does not have sufficient control ability as the bending of the work roll is restricted by the reinforcing roll.

Cross-roll rolling is known as one of the techniques to solve this problem of reduced flatness. In this cross-roll rolling, the axes of the upper and lower work rolls are aligned in a plane parallel to the surface of the rolled plate. This is intended to control the thickness distribution in the width direction of the rolled plate material by inclining them in opposite directions relative to the plate direction. For example, as shown in Fig. 1, the upper and lower work rolls 1 and 1' of a four-high rolling mill sandwich the rolled material 2 vertically and intersect with each other in a plane parallel to the surface of the rolled plate. ing.

If the cross section f1θ is adjusted to 1"4, the thickness distribution in the 1j direction of the rolling mill 2 can be controlled and the rolled material 2 with a uniform thickness can be rolled. Since shear stress acts in opposite directions,
1. The cross section of the F elongated material 2 is deformed into a parallelogram shape as shown in FIG. In this way, the rolled material 2 is deformed,
If the angle of the corner part of the cross section deviates greatly from 90' and becomes α°, this edge part (α〈90°)
Since the material is bent during handling and cannot be used as a product, it must be trimmed, reducing the yield. Also,
Pressure☆1; material 2 whose cross section is parallelogram-shaped in this way is [E +j! ; Later, when overboarding the processing line offshore, contact with the edge part or the processing line guide can easily cause damage and breakage of the board. As described above, cross-roll rolling has various problems in terms of work.

Therefore, in order to solve this problem, a cross-roll tandem rolling mill has been proposed ("i4+-Koku Sho 55-93226"). Jll to roll, J-Le Cross type rolling yang in tandem in f4', 4E direction (introduction)
In addition, the intersection of the upper and lower work rolls of adjacent rolling mills is reversed (see Figure 3). The rolling mill receives stress from the upper and lower work rolls 1 and 1'; however, because the intersections of the adjacent upper and lower work rolls 1 and 1' are reversed, the shear stress is alternately directed in opposite directions and cancel each other out. Therefore, as shown in Fig. 2114, as the number of times the bridge is passed from one rolling mill to another (number of passes) increases, the angle α of the corner of one side of the plate approaches 90°, and the cross-sectional deformation is eliminated. The above-mentioned roll cross type lindem rolling mill is equipped with a roll cross drive device that tilts the upper and lower work rolls in opposite directions in order to intersect the upper and lower work rolls at a required angle, and has a complicated structure. That is, as shown in FIG. 5 of the roll cross drive device, the upper and lower work rolls are placed at both ends with upper and lower roll chocks 1a*]b, 1'a+l'b.

Supported by this upper and lower roll chock la.

11+, j'a, 1/bK its ijl Moving cross head 2a+'2b, 3a13b, 2'a+2' from the P direction (back and forth direction with respect to the rolling material (7) traveling direction)
b13'a.

3'1] are provided facing each other, and these crossheads 2a, 2b, 3a, 3b, 2'
a + 2' b + 3/a.

11 aircraft VI4 that moves 3'b forward or backward
a.

4 b, 4'a, 4. ’b is provided.

As described above, the four-wheel cross drive system is complicated (one-to-one construction is complicated, the equipment costs are high, and maintenance is poor.In addition, multiple roll cross drive systems of this kind are required). In view of the above-mentioned circumstances, the present invention is designed to reduce equipment and construction costs,
The objective is to provide a cross-roll tandem rolling mill row with a small number of parts and low maintenance costs, and its configuration is such that the upper and lower work rolls intersect in a plane parallel to the rolling plate m1. In a cross-roll tandem rolling mill row in which rolled mills are arranged in tandem, one work roll is fixed in a direction perpendicular to the rolling direction of the rolled material, and the other work roll is bent in the rolling direction to roll one workpiece. 'J9 e4' refers to the arrangement in which the rolls intersect with each other and the inclinations of adjacent work rolls are reversed.

Hereinafter, the cross-roll tandem rolling mill row of the present invention will be explained in detail in s4 based on an example.

As shown in FIG. 6, the present invention is applied to a cross-roll type rolling mill row in which upper and lower work rolls 11 and l1' are arranged in the rolling direction, and the intersection of the adjacent upper and lower work rolls is set to P in the opposite direction. , - upper and lower work rolls 11, 1
1' with respect to the rolling direction of the rolled material.
The work roll is fixed at the r1 angle, and only the other work roll is provided so as to be tiltable relative to the other work roll. That is, as shown in FIGS. 7 to 9, the rolled material 12 is sandwiched vertically.
Of the two lower work rolls 11 and 11', the lower work roll 11' has its both ends attached to the lower roll chocks 13/a l
13'b and is fixed perpendicular to the direction of movement of the rolled material. On the other hand, the upper work roll 1 is supported at both ends by upper work rolls 13a and 13bK, and is provided with a roll cross drive device fft. Zubu: °C, upper work roll chock 13 a, 13
Cross head 1 for 11i transferred from the front and back direction to b
4a, 14T).

15a, 151) are provided facing each other, and the crossheads 14a, 14b,', 1'5a, 15b are provided with IF(!Fll frames i++16a, 16b, 17a), respectively.
, 17b are connected. Therefore, the driving machine 1'f" 1
6 a Activate H16, b+17a, 17b,
moving crosshead], 4 a, l 4 b,
15a, 15b and upper roll chock 1.3
a, 13b move back and forth, and the upper work roll 11
is inclined at a required angle with respect to the lower work roll 11',
They will intersect.

Such upper and lower work rolls 11, 11' and roll cross! [The rolling mills equipped with the 1X moving device PI are arranged in tandem to form a rolling mill row, and the inclinations of the upper work rolls 11 that are in contact with each other are set to be opposite to each other. - In the roll cross tandem rolling mill row of the present invention having the above configuration,
The structure is such that the roll cross drive tilts only the upper work roll 1. That is, the structure for tilting the lower work roll 11', which is different from the conventional roll cross drive device shown in FIG. 5, is unnecessary.

Therefore, in the present invention, the drive system of the drive device 〆1 is
This simply reduces the number of parts, significantly reducing costs, and improving maintainability and workability.

In addition, in the present invention, the correlation of the plate thickness distribution with respect to the cross angle θ and the half width of the work rolls is also stated to be ``shown by the following formula 1 A'' as in the past, and this 1
Using the formula, the month-extension condition (ζ).

If the crossing angle θ is set according to (b, DW), it is possible to omit the desired crown required for the next step. Also, the intersecting angle θ=0'', 0.5°C: crown, ζ: influence coefficient, b: in rolled material.

θ: Crossing angle, DW! When we experimentally determined the correlation between plate thickness distribution and folding when the work chrono L diameter was 1.0°, we obtained the results shown in Figure 10.It is clear from the results in Figure 10 that , c When the intersection angle θ=0°, the rolled material is rolled to a medium height as shown in FIG. As shown in No. 1, the rolled material 12 is rolled flat by [1], and when the intersection angle θ=1σ, the rolled material 12 is rolled to an elevated height as shown in No. 111 S1 (C).

In the present invention, since only the upper work roll 11 is tilted and the lower work roll 11' is not tilted, the rolling strip 12 is subjected to unbalanced forces in the rjJ directions. Therefore, in order to prevent meandering when passing through several upper and lower work rolls 11 and 11', one upper and lower roll chock 13a, 13t) + 13'a
, left and right independently under the pressure of 13'b? ! ! It is advisable to provide a mechanism for adjusting r♂ and 1 to deal with the problem. Of course, it is possible to correct the deterioration in flatness (shape defects) caused by uneven elongation in the direction of the plate IJ force and the shear deformation that occurs in the cross section of the rolled material.The rolling mill itself is simple. Because of this, it can be compactly rolled and arranged, and it is easy to install and maintain.

[Brief explanation of the drawing]

Figures 1 to 5 relate to a conventional rolling mill, with Figure 1 being a plan view of the upper and lower work rolls, and Figure 2 being a cross-sectional view of the rolled material.
Diagram N3 is a distribution diagram of the upper and lower work rolls in a roll-cross type tandem rolling mill row, and Figure 4 is the F versus number of passes.
[- Correlation diagram of the deviation angle α of rolling, FIG. 5 is a perspective view of the roll cross drive device fi, and FIGS. 6 to 11 relate to the present invention. FIG. Figure 7 is a plan view of the upper and lower work rolls, and Figure 8 is the 11! of the upper and lower work rolls. II
Blood diagram, Figure 9 is a perspective view of the roll cross drive device, Figure 10
1X+ is a phase relationship diagram of plate thickness distribution with respect to folding, and FIGS. In the drawing, 11 is the upper work roll, 11' is the lower work roll, 12 is the rolling mill, 13a and 13b are the upper work roll chocks, and 13'a
, 1.3'b is the lower work roll chock, 14a, 1
4b, 15a, 15b are crossheads for one person with small force, 16
a, 16b, 17a, 17b are r (``Yamai'M''#3
Teal. Special bar 1-exit 1 (j H person Mitsubishi Heavy Industries Ltd., company Shin Nihon Tai・Bot'1 type company

Claims (1)

[Claims] In a cross-roll tandem rolling mill row in which rolling mills are arranged in tandem with upper and lower work rolls intersecting in a plane parallel to the rolling plate surface, one work roll is fixed in a direction perpendicular to the traveling direction of the pressed material. At the same time, the work rolls used are tilted in the rolling direction so that they intersect with one of the work rolls, and the adjacent work rolls are arranged with opposite inclinations. .