JPS5853311A - Multistage cluster rolling mill - Google Patents

Abstract

PURPOSE:To reduce the generation of edge drops and to improve performance for controlling shapes by using split type eccentric rolls for the backup rolls of multistage cluster rolling mills, and making combination use of roll bending mechanisms with the metal chocks of work rolls. CONSTITUTION:In multistage cluster rolling mills, backup rolls 4 are split to plural rolls in the axial direction of stationary shafts 5a, and the axial centers of the respective split backup rolls 4' are off-centered. Crowns are adjusted by the entire part of the rolls 4' to eliminate medially high crowns. Work rolls 2 and intermediate rolls 3 are made freely movably respectively independently via joints 2a, 3a, whereby their positions are adjusted to the end parts of a member (a) to be rolled. Further, roll bending mechanisms 11 are provided in combination with the metal chocks 8 of the rolls 2 to change the partial pressure of their contact surfaces. By such mechanisms the shapes of not only the end parts of the plates but also the parts near the center are controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-stage cluster rolling mill, and particularly to a high-reduction rolling mill that has excellent performance in controlling the shape of rolled material.

In recent years, 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 productivity, heat, energy saving, etc. On the other hand, there are also demands for plate thickness accuracy and shape. It's becoming increasingly strict.

There is a multi-stage cluster type rolling mill that enables cold rolling under high pressure. In such a multi-stage cluster type rolling mill, the diameter of the work roll can be reduced, so the rolling load is small and high rolling reduction is possible. It is known that the shape of the rolled material becomes defective, and one of the conventional means of controlling the shape of such multi-stage cluster rolling mills is to divide the reinforcing rolls in the axial direction and adjust the position of their axes. To change relatively.

That is, by making the reinforcing roll into a split type and extruding it in a convex shape with respect to the work rolls (see Fig. 6), the reinforcing rolls are used to read the intermediate rolls and work rolls that are enjoyed by the rolling load in the opposite direction. A technique was adopted to obtain flat rolled material.

However, when the width of the rolled material is narrow, most of the rolling load is applied to the center of the rolls, which not only makes it difficult for the intermediate rolls and work rolls to bend along the reinforcing rolls, but also causes contact deformation between the rolls. The central part is very large, and the effect of the convex deformation of the reinforcing roll is difficult to transmit to the work roll.

Furthermore, there is a drawback that this function alone cannot prevent shape defects such as edge drops and edge waves occurring at the ends of the rolling mill.

The present invention aims to eliminate the above-mentioned drawbacks of conventional multi-stage cluster rolling mills. In a multistage cluster rolling mill in which a plurality of supporting reinforcing rolls are vertically symmetrically arranged, at least two upper and lower reinforcing rolls each constitute one divided reinforcing roll, and the crown is adjustable.

The groove bottom moves in the axial direction of the work roll and the intermediate roll, and is further characterized in that it is supported by a metal chock of the work roll and is also equipped with a roll bending mechanism. The place is 1
Split-type reinforcing rolls with 0T crown adjustment function are suitable for roll shifting (moving the rolls in the axial direction) and roll bending (roll rolling) in quadruple rolling mills, large rolling mills, or multi-stage cluster rolling mills. (method of applying pending force to the shaft end) Vr provides a multi-stage crust rolling machine with greatly improved shape control performance.

The present invention has the above-described configuration, and the crown of the reinforcing roll as a whole is adjusted by adjusting each divided reinforcing roll formed in a split shape.

The medium and high crown can be eliminated in accordance with the rolling conditions of the rolled plate material, and the work rolls below -h can be moved in opposite directions in the axial direction, and the intermediate rolls can also be moved in opposite directions in the axial direction.

By positioning the crown parts provided at both ends of the work roll and the intermediate roll at both ends of the rolled plate material, it is possible to create a short shape that is an effective support for the work roll, and to make the deformation of the work roll finely and uniformly in the thickness direction. Can be made small,
Furthermore, by applying roll bending to the work roll, it is possible to control the shape not only at the edges but also at the center by changing the contact surface pressure distribution, making it possible to significantly reduce edge drops and significantly improving shape control performance. can be directed.

Embodiments of the present invention will be described below with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 and 2.

In FIG. 1, (al) is a rolled plate material that is rolled in the direction of the arrow, (2) is a pair of upper and lower work rolls,
(3) is a set of 2 intermediate rolls - (4) is a set of 6 reinforcements with 0
-#, (Metal chock of the same reinforcing roll for 51, (6
1 is the support frame of the metal chock, (9) is the rolling device, and (7) is the metal chock of the intermediate roll.

In contrast to the metal chock (7), a pair of upper and lower intermediate rolls (3) can be displaced symmetrically with respect to a vertical plane passing through the axis of the E lower work roll (2) (horizontal direction in Fig. 1). (Explanation of specific rumors is omitted). (8) is the metal chock of the work roll, and 001 is the no.

Furthermore, (Ill is a hydraulic cylinder that applies a bending force to the work roll (2), 021 is a hydraulic cylinder that lifts the metal chock (5) of the reinforcing roll, and as shown in FIG. 2, the reinforcing roll (4) is Fixed shaft (5a)
is divided into a plurality of parts in the axial direction, and the bearings of each divided reinforcing roll (4') are eccentric with respect to the axis of the shaft (5a). Each divided reinforcing roll (4') can be adjusted individually, and the crown of the reinforcing roll (4) as a whole can be adjusted as shown in FIG. 3.

Further, as shown in Fig. 2, the work roll (21) and the intermediate roll (3) are connected to a joint (2b) and a joint (3b), respectively.
A work roll (not shown) (21 intermediate roll (3)
Each of the lower work rolls (2) and the upper and lower intermediate rolls (3) are independently movable in the axial direction (in the direction of the arrow). As shown in Figure 4, the effective lengths of the work roll (2) and the intermediate roll (3) are both crowned with crowns that have a slightly smaller diameter than the central part. (2a) (3a) are rolled up. Note that this rolling mill is driven by five normal intermediate rolls because the work rolls have a small diameter.

Since the illustrated embodiment has the structure described above, its operation and effects will be explained first.

In general, the shape of the rolled plate material (a) is caused not only by the elastic deflection of the rolls but also by uneven flatness of the roll contact area due to uneven contact pressure between the rolls, and by uneven temperature at each part of the rolls, which is the so-called thermal crown. It appears as a result of a combination of factors such as wear and tear on the rolls, etc., and although it is extremely complex and there are many means for controlling the shape, fine control of the shape is possible.

Figure 5 shows the roll length (C, barrel length)) and the board width (B)
An example of the effect of the ratio of l on the roll contact surface pressure distribution is shown,
In a certain quadruple rolling mill, B/'n = 1.0 and B,z
, = 0.5, the contact surface pressure distribution is generally (a)
and (b), the amount of roll flattening is approximately proportional to the contact surface pressure, so if the plate width (B) is smaller than the roll width mark (5) as shown in (b), the roll flattening Corrective measures are needed to prevent the increase in crown of rolled material due to

In addition, Figure 6 (a) V shows a situation in which edge drop occurs, and the contact surface pressure generated between the work roll and the intermediate roll in the K1 section bends the small diameter work roll and causes the plate to protrude from the edge of the plate. Due to the uneven pressing, edge drops mainly occur in the cross section of the plate as shown by the solid line in FIG. 6(b).

Next, in the seventh ambiguity, the work role (2:
The state of shift and intermediate roll (3) is shown, and the upper and lower pair of work rolls are moved in opposite directions according to the sheet width of +21+21, and the crown (2a) portion is adjusted to the end of the rolled sheet material (a). The other end is the work roll (
2), and an edge drop will occur at this part, but in order to reduce the impact of this straight body contact part, the intermediate roll (31 is also used as a work roll) as shown in Figure 2. Similarly, by adjusting the shift and releasing the pressure chip on the work roll (2), edge drop can be improved, and by applying a pending force to the work roll, the contact surface pressure distribution can be changed, and the plate edge It is possible to control the shape not only of the shape but also of the part near the center.
The profile of the rolled plate material (at) when the roll in/7J of the work roll (2) is combined with the above two roll shift effects is flat as shown by the chain line in Figure 6 (b), and the edge drop is significant. Reduced rolled plate material is obtained, and shape control performance is greatly improved.

In the above explanation, the present invention was applied to a cluster rolling mill with six rolls on one side, but a multistage rolling mill in which an appropriate number of second intermediate rolls are arranged between a split reinforcing roll and an intermediate roll is also applicable. The present invention can be applied to a cluster rolling mill, and the intended purpose can be achieved by applying two split reinforcing rolls to each of the lower rolls.

Although the embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to these embodiments, and that various changes in design may be made without departing from the spirit of the present invention. be.

[Brief explanation of drawings]

FIG. 1 is a side view of a multi-stage cluster rolling mill showing an embodiment of the present invention, and FIG. 2 is a side view of FIG. The crown adjustment diagram of the reinforcing roll, Figure 4 is the same intermediate roll, 7-Crawl diagram-No. 51J (a) and (b) are the general contact surface pressures between rolls fit? , Akira figure, 6th figure mark (b) is edge 1! FIG. 7 is an explanatory diagram of the occurrence of lops, and is an explanatory diagram of the embodiment. 2: Work roll 3: Intermediate roll 4: Sleeve opening to loop 4': Split reinforcement rolls 2b, 3b: Joint
8: Work roll metal chock 11: Work roll roll d-nding mechanism (hydraulic cylinder) Sub-agent: Patent attorney, 2 persons outside of Kaimoto's important literature

Claims (1)

[Claims] In a multi-stage cluster rolling mill in which a pair of upper and lower work rolls, a set of intermediate rolls of two upper and lower pots that support the work rolls, and a plurality of reinforcing rolls that support these rolls are arranged vertically symmetrically, At least two upper and lower hooks of the rolls are configured to be split eccentric rolls and have adjustable crowns, and the work roll and intermediate roll have a w4 bottom that moves in the roll axis direction,':! −
Furthermore, a multi-stage cluster rolling mill characterized in that work rolls are supported by metal chocks and a roll bending mechanism is also provided.