JPS6222683B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in cross-roll rolling mills.

Cross-roll rolling mills are designed to improve the thickness accuracy in the width direction of rolled products and extend the wear life of the rolls. It is possible to intersect at an angle (for example, see Japanese Patent Laid-Open No. 55-64908, 153605). The mechanism for making the upper roll and the lower roll cross each other at a required angle with respect to a line perpendicular to the rolling direction will be explained with reference to FIG. 1, which illustrates the roll cross mechanism of a four-high rolling mill. The intersection is
Roll jocks 3a, 3b and 3a', 3b' of upper rolls 2a, 2b and lower rolls 2a', 2b' are mounted directly or indirectly on housing 1 or on pedestals 4a, 4b and 4 attached to housing 1.
The upper rolls 2a, 2a, 4b' are moved horizontally in the opposite direction by jacks 5a, 5b, 5c, 5d and 5a', 5b', 5c', 5d' operated by electric motors (not shown) provided on the upper rolls 2a, 4b'. 2b and lower rolls 2a' and 2b' are rotated in opposite directions around vertical axes.

On the other hand, above the roll chock 3b, there is a top equalizer beam 6, which is a member that supports the rolling reaction force transmitted to the roll chock, and below the roll chock 3b', there is a top equalizer beam 6, which is a member that supports the rolling reaction force transmitted to the roll chock. Bottom equalizer beams 6' are provided positioned within the windows of the housing 1, respectively, so that the jacks 5a, 5b, 5c, 5d and 5a', 5b',
Upper rolls 2a and 2 are driven by driving 5c' and 5d', respectively.
b and the lower rolls 2a' and 2b', relative sliding motion occurs between the roll chock 3b and the top equalizer beam 6 and between the roll chock 3b' and the bottom equalizer beam 6' (note that the equalizer beam In the case of cross-roll rolling mills of the type without a horizontal sliding movement between the roll chock and the housing or between the roll chock and the rolling device).

When the roll crossing device is activated before rolling starts, the vertical load applied to the lower sliding surface is applied to the lower rolls 2a', 2b' and the roll jocks 3a', 3.
b′ is the total weight of the lower roll group consisting of It's not that difficult to make it slide. However, in the structure shown in FIG. A very difficult problem arises because the roller ' is moved horizontally against the frictional resistance caused by the rolling load.

The present invention aims to solve such problems and provide a structure in which the intersecting angle of the rolls can be easily changed even during rolling. The present invention is characterized in that a frictional resistance reducing device is provided between the members that support the rolling reaction force.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A cross roll rolling mill according to the present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 2 is a side view of the cross-roll rolling mill according to the present invention, in which frictional resistance reducing devices 7 and 7 are provided between the roll chock 3b and the top equalizer beam 6 and between the roll chock 3b' and the bottom equalizer beam 6', respectively. ′ is provided.
Note that in FIG. 2, the same members as those in FIG. 1 are designated by the same numbers, and explanations thereof will be omitted.

3 and 4 show specific examples of the frictional resistance reducing device 7, 7' according to the present invention, and FIG.
The figure shows the case where rod-shaped rollers are used, and FIG. 4 shows the case where a hydraulic plane bearing is used. In the case of a pressure oil type plane bearing, several pockets 7a are provided on the sliding surface side, and pressure oil is fed into these pockets 7a from pumps P ₁ , P ₂ and P _3, respectively. In addition,
Although the above two examples are shown as the frictional resistance reducing devices 7 and 7', it goes without saying that the present invention is not limited to these.

In this way, in the present invention, since the frictional resistance reducing device is provided between the roll chock and the equalizer beam, the work roll 2
A rolling reaction force acts on each of a and 2a', and the rolling reaction force acting on the upper work roll 2a is transmitted through the upper back up roll 2b, the roll chock 3b, the frictional resistance reducing device 7, and the top equalizer beam 6.
In addition, the rolling reaction force acting on the lower work roll 2a' is applied to the lower back up roll 2b' and the roll chock 3.
b', the frictional resistance reducing device 7', and the bottom equalizer beam 6', and are finally supported by the housing 1. At this time, the jacks 5a to 5 are operated by an electric motor (not shown) to change the crossing angle of the rolls.
d and 5a' to 5d' to move the roll chock 3.
When moving a, 3b and 3a', 3b' in the horizontal direction, frictional resistance reducing devices 7, 7' provided above and below
has sufficient force transmission ability against the rolling reaction force in the vertical direction, and has low frictional resistance in the horizontal direction, so the roll jocks 3a, 3b and 3a', 3b' can easily move horizontally. be.

The embodiment shown in FIG. 2 is a cross-roll rolling mill in which the roll jocks 3b and 3b' hold the roll jocks 3a and 3a', respectively, but even if the latter is independent from the former, the above-mentioned embodiment will still work. It is easy to infer that it acts in the same way.

As described above based on the embodiment shown in the drawings, according to the present invention, (1) the crossing angle of the rolls can be easily changed during rolling, so that the strip plate can be easily changed during rolling. It becomes possible to detect the thickness distribution in the width direction and perform rolling control by finely adjusting and changing the crossing angle of the rolls based on the results, thereby greatly improving the accuracy of the product strip in the width direction.

(2) Since the resistance in horizontal movement of the rolls is small, the power required for the cross-roll rolling mill is small, and the capacity of the device itself can be reduced.

There are other effects.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional cross roll rolling mill.
FIG. 2 is a side view of a cross-roll rolling mill according to the present invention, and FIGS. 3 and 4 are diagrams showing two embodiments of the frictional resistance reducing device according to the present invention. In the drawings, 1 is a housing, 2a, 2b and 2a', 2
b' indicates rolls 3a, 3b and 3a', 3b' are roll jocks; 4a, 4b and 4a', 4b' are pedestals;
5a, 5b, 5c, 5d and 5a', 5b', 5
C' and 5d' are jacks, 6 and 6' are equalizer beams, and 7 and 7' are frictional resistance reducing devices.

Claims (1)

[Claims] 1. A cross-roll rolling mill characterized in that a frictional resistance reducing device is provided between a roll chock in a housing and a member that supports rolling reaction force transmitted to the roll chock.