JPS64122B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention takes advantage of the characteristics of a split-type reinforcing roll with adjustable crown, and combines shape control methods using roll shifting and roll bending methods to successfully roll even narrow-width materials. The present invention relates to a contemplated multi-stage cluster rolling mill.

In recent years, in the rolling field, there has been a demand for high-reduction rolling mills that can significantly reduce plate thickness in a single rolling process from the viewpoint of improving productivity and saving energy. is also becoming increasingly strict. There is a multi-stage cluster type rolling mill that has made the above-mentioned high-reduction cold rolling possible.In this multi-stage cluster type rolling mill, the work rolls can be made smaller in diameter, so the rolling load is small and high reduction is possible. On the other hand,
It is known that when the diameter of the work roll is reduced, the bending deformation of the work roll due to the rolling load becomes large and the shape of the rolled material becomes defective.

Conventionally, the shape control means for this type of multi-stage cluster rolling mill has been to relatively change the position of the axis of reinforcing rolls that are divided into a plurality of pieces in the axial direction. For support, a bracket is provided between each reinforcing roll, and these brackets are attached to a fixed shaft alternately with the divided reinforcing rolls, and the structure is attached to a metal chock. The purpose is to obtain a rolled material with uniform wall thickness by extruding the reinforcing roll as a whole into a convex shape with respect to the work roll by rotation, and by bending the intermediate roll and work roll in the opposite direction, which are bent by the rolling load. .

However, in the conventional structure described above, a large number of brackets are provided between each reinforcing roll in order to support the reinforcing roll on a fixed shaft, which not only complicates assembly and adjustment but also has drawbacks such as an increase in the number of processing steps. . In addition, when the width of the rolled material is narrow, most of the rolling load is applied to the center of the roll, making it difficult for the intermediate roll or work roll to bend along the reinforcing roll.
Moreover, the contact deformation between the rolls becomes larger toward the center, and the effect of the convex deformation of the reinforcing roll is difficult to be transmitted to the work roll.

The present invention improves the above-mentioned drawbacks of the conventional example, takes advantage of the features of the split reinforcing roll with adjustable crown, and combines shape control methods such as roll shifting and roll bending to significantly improve the shape control effect. It is an object of the present invention to provide a multi-stage cluster rolling mill that can reduce processing man-hours, simplify assembly and adjustment, and significantly reduce costs.

The configuration of the present invention that achieves the above object includes a pair of upper and lower work rolls, two intermediate rolls each on the upper and lower sides that press these work rolls, and a pair of upper and lower intermediate rolls that press the work rolls via these intermediate rolls. In a multistage cluster rolling mill having a plurality of reinforcing rolls, the intermediate roll can apply a roll bending force to the rolled material via the work roll, and the intermediate roll moves in a direction parallel to the axis thereof. The two sets of upper and lower intermediate rolls are attached to two sets of upper and lower metal chokes, respectively, so that the two sets of upper and lower metal chokes each support one intermediate roll, and the intermediate rolls are divided into two. It is characterized by being able to move independently in directions parallel to the direction in which the rolled material travels.

Hereinafter, one embodiment of the present invention will be described in Figures 1 to 3.
This will be explained in detail with reference to the drawings. In the figure, a rolled material 1 is rolled in the direction of arrow a, 2 is a pair of upper and lower work rolls, 3 is an intermediate roll, and 4 is a reinforcing roll. Further, 5 is a metal chock of the reinforcing roll 4, 6 is a support frame of the metal chock 5, and 7 is a metal chock of the intermediate roll 3. A pair of upper and lower intermediate rolls 3 are connected to a vertical plane passing through the center of the upper and lower work rolls 2. , so that they can be displaced symmetrically. Furthermore, 8 is a metal chock of the work roll 2, and 9 is a lowering device, which are installed in the housing 10. Work roll 2
is equipped with a hydraulic cylinder 11 for applying a bending force, the intermediate roll 3 is equipped with hydraulic cylinders 12 and 13 for applying a bending force, and the reinforcing roll 4 is equipped with a hydraulic cylinder 14 for lifting the metal chock 5. An eccentric wheel 15 is fitted onto the reinforcing roll 4. The reinforcing roll 4 is divided into a plurality of parts in the axial direction of the fixed shaft 16, and each reinforcing roll 4 has a bearing on the fixed shaft 16.
By rotating the eccentric wheel 15 using an adjustment device (not shown), each reinforcing roll 4 can be adjusted individually, and the reinforcing roll 4 as a whole can be reinforced as shown in FIG. roll 4
The crown can be adjusted. In addition, the third
As shown in Figures a and b, the bearing portion 17 of the intermediate roll 3 is supported by a metal chock 7, and the metal chock 7 is composed of chock division pieces 18 and 19 that are vertically divided into two on the axis of the upper and lower work rolls 2. , each can move independently in the horizontal direction, and the interval between the intermediate rolls 3 can be freely changed.

By the way, in general, the shape of the rolled material 1 is determined not only by the elastic deflection of the rolls but also by the unevenness of the flattening of the contact area between the rolls and the unevenness of the temperature of each part of the rolls. It appears as a result of aggregation of wear, etc., and is extremely complex. Therefore, the more shape control means there are, the more detailed shape control becomes possible. Therefore, the reason why it is difficult to control the shape of the narrow plate is that even if the reinforcing roll 4 is deformed into a convex shape, the rolling load is transmitted near the center of the roll, and the intermediate roll 3
Therefore, in order to bend the intermediate roll 3 sufficiently, it is necessary to apply a roll bending force to the end of the intermediate roll 3.

As described above, according to the multi-stage cluster rolling mill of the present invention, even if the roll diameter changes due to roll wear etc., even if the intermediate roll receives uneven rolling load from a plurality of reinforcing rolls, the contact surface of the work roll will not be affected. It automatically moves horizontally to apply pressure evenly, ensuring that the best rolling load is always transmitted.
In addition, the split reinforcing roll is divided into multiple pieces in the axial direction of a fixed shaft, and each reinforcing roll is eccentric to the axis, which simplifies assembly and greatly improves the shape control effect. It is possible to do so.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention, Figure 2 is a side view showing one embodiment of the present invention;
The figure is the upper half of the front view showing the state when adjusting the crown, Figure 3a is an enlarged side view of the main part,
Figure b is a plan view of the same, and the symbols in the figure are: 1 is the rolled material, 2 is the work roll, 3 is the intermediate roll, 4 is the reinforcing roll, 7 is the metal chock of the intermediate roll, 10 is the housing, 11, 12, 13 ，
14 is a hydraulic cylinder, 15 is an eccentric wheel, 17 is a bearing portion, and 18 and 19 are choke division pieces.

Claims (1)

[Claims] 1. A multistage device having a pair of upper and lower work rolls, two intermediate rolls each on the upper and lower sides that press these work rolls, and a plurality of reinforcing rolls that are arranged symmetrically above and below and that press the work rolls via these intermediate rolls. In the cluster rolling mill, two sets of upper and lower intermediate rolls are provided so that the intermediate rolls can apply a roll bending force to the rolled material via the work rolls and can move in a direction parallel to their axes. Each of the rolls is attached to two sets of upper and lower metal chock, and these two sets of upper and lower metal chock are divided into two so that they each support one intermediate roll, and the divided metal chock is moved in a direction parallel to the traveling direction of the rolled material. A multi-stage cluster rolling mill characterized in that each cluster is movable independently.