JPH0543921Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a multi-high rolling mill equipped with segmented back-up rolls.

<Prior Art> Various types of rolling mills are used to roll steel plates, light alloy plates, etc. An example of a multi-stage cluster rolling mill is schematically shown in FIGS. 3 and 4.

As shown in the figure, one work roll 2, two intermediate rolls 3, two sets of divided back-up rolls 4, and an auxiliary divided back-up roll are placed above and below the threading section through which the material to be rolled 1 passes. 5 are arranged facing each other.

The divided back-up rolls 4 include one center roll 4a and two quarter rolls 4 each.
b and side rolls 4c, and is rotatably supported by a fixed shaft 6. A roll eccentric device 7, a perspective view of which is shown in FIG. 5, is attached to the center roll 4a and the quarter roll 4b. This roll eccentric device 7 is
The rotary actuator 7a rotates an eccentric bush 7e that holds the rollers 4a and 4b via a pinion 7b, a rack 7c, a lever 7d, etc., and has a sector gear 7f that synchronizes the opposing eccentric bushes 7e. ing.

This multi-stage cluster rolling mill performs rolling by driving intermediate rolls 3. During normal rolling, a suitable roll crown is formed by split back-up rolls 4, and the intermediate rolls 3 and work rolls 2 are As shown in Figure 6, a V-shaped (a in the figure) or W-shaped (b in the figure) rolling force (hereinafter referred to as a rolling pattern) is applied. This is to prevent the work roll 2 from being bent due to the deformation resistance of the rolled material 1, resulting in an uneven product, and the roll eccentric device 7 is controlled according to various rolling conditions.

<Problems to be Solved by the Invention> However, in the multi-stage cluster rolling mill described above, the number of divisions and the division positions of the upper and lower divided backup rolls 4 are the same, so the rolling pattern is limited.
Therefore, precise shape control according to the material and rolling rate of the material to be rolled 1 cannot be performed, and minute local elongation may occur in the product.

<Means for solving the problem> Therefore, in the present invention, work rolls are arranged facing each other above and below the threading section through which the material to be rolled passes, intermediate rolls that press these work rolls, and axially A multi-high rolling mill equipped with a divided back-up roll that is divided into a plurality of parts along the axis and presses the intermediate rolls respectively, in which the upper divided back-up roll and the lower divided back-up roll have different division forms. was used.

<Operation> In the multi-high rolling mill according to the present invention, the upper divided back-up roll and the lower divided back-up roll are each controlled by a roll eccentric device to perform precise shape control.

<Example> An example in which the present invention is applied to a multi-stage cluster rolling mill will be described with reference to FIGS. 1 and 2. Figure 1 is similar to Figure 4 of the conventional example mentioned above, and Figure 2 is similar to Figure 6 of the conventional example.
Each corresponds to the figure. In addition, in the description, the same reference numerals are given to the same members as in the conventional example, and redundant description will be omitted.

As shown in FIG. 1, the configuration of the rolls on the upper side of the material to be rolled 1 is the same as that of the conventional example, but on the lower side, the divided form of the divided back-up rolls 8 is different.
That is, the lower divided back-up roll 8 is divided into six parts, including a quarter roll 8b and a side roll 8b.
In addition to c, there are also two center rolls 8a. The roll eccentric device 7 is attached to the center roll 8a and the quarter roll 8b as in the conventional example.

In the multi-stage cluster rolling mill of this embodiment, since the upper and lower divided back-up rolls 4 and 8 have different division forms, for example, a plate strain detector (not shown) detects the shape error of the rolled material 1 after rolling. detect,
As shown in FIG. 2, it is possible to subtly change the rolling pattern. What is shown in Figure 2 is
This is the application state of the pressurizing force in this embodiment, and the pressurizing pattern applied to the upper and lower work rolls 2 is as follows.
It can be seen that the shapes are complicated, such as the V-shape indicated by a and a1 in the figure, and the W-shape indicated by b and b1.

In this embodiment, the present invention is applied to a multi-high cluster rolling mill, but it may also be applied to a multi-high rolling mill other than the cluster type, such as a six-high rolling mill.
Further, the number of divisions of the divided backup rolls is not limited to that of this embodiment, and for example, the number of upper and lower divisions may be the same, but the division positions may be different.

<Effects of the invention> In the multi-high rolling mill according to the invention, the upper divided back-up roll and the lower divided back-up roll each have a different number of divisions, so a complicated structure corresponding to various rolling conditions is required. It becomes possible to roll with a reduction pattern, and it is possible to manufacture high-quality products without local elongation.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a plan view of a multi-stage cluster rolling mill according to an embodiment of the present invention, and a diagram showing a state in which rolling force is applied by divided back-up rolls, respectively. Also, what is shown in Figures 3 and 4 is
FIG. 1 is a plan view and a side view of a conventional multi-stage cluster rolling mill, respectively. What is shown in FIGS. 5 and 6 are application state diagrams in a roll eccentric device and a conventional multi-stage cluster rolling mill, respectively. In the figure, 1 is a material to be rolled, 2 is a work roll, 3 is an intermediate roll, and 4 and 8 are divided back-up rolls.

Claims (1)

[Scope of utility model registration request] Work rolls are arranged facing each other above and below a threading section through which the material to be rolled passes, and intermediate rolls press each of these work rolls, and are divided into a plurality of parts along the axial direction, each pressing the intermediate rolls. 1. A multi-high rolling mill equipped with a split back-up roll, characterized in that the upper split back-up roll and the lower split back-up roll have different split forms.