Roll stand for rolling a metal product

Abstract

A roll stand for rolling a metallic product and having two work-rolls supported in the roll stand by respective work-roll chocks. An axial displacement arrangement is provided with which the work-rolls can be displaced in direction of their longitudinal axes, and at least one work-roll locking arrangement is provided with which the work-roll chocks can be locked and unlocked in the roll stand. A rotation prevention arrangement is provided with which the axial displacement arrangement can be prevented from rotation about longitudinal axes of the work-roll. A bending arrangement is provided which includes a bending block and with which a bending torque can be applied to the work-rolls. In order to achieve a simpler design of the assembly and improved lubrication possibilities for the component to be lubricated, the rotation prevention arrangement and the axial displacement arrangement are fixedly connected with the bending block.

Claims

1. A roll stand for rolling a metallic product comprising: two work rolls supported in the roll stand by respective work roll chocks; an axial displacement means with which the two work rolls can be displaced in direction of their longitudinal axes, at least one work roll locking means with which the work roll chocks can be locked and unlocked in the roll stand, rotation prevention means with which the axial displacement means can be prevented from rotation about longitudinal axes of each of the two work rolls, bending means which includes a bending block and with which a bending torque can be applied to the two work rolls, and wherein the at least one work roll locking means, the rotation prevention means and the axial displacement means are fixedly connected with the bending block.

2. The roll stand according to claim 1, wherein the rotation prevention means, the axial displacement means, and the bending block form an integral unit.

3. The roll stand according to claim 1, wherein connection of the at least one work roll locking means, the axial displacement means, and the bending block is formed as a screw connection.

4. The roll stand according to claim 1, wherein two, arranged one above the other, axial displacement means are secured on the bending block.

5. The roll stand according to claim 1, wherein a releasable displacement locking means is provided which is located between the axial displacement means and the bending block and can be secured there in order to prevent displacement of the axial displacement means relative to the bending block.

6. The roll stand according to claim 1, wherein a medium access is provided on the bending block.

7. The roll stand according to claim 6, wherein the medium access communicates with an entrance for medium for the at least one work roll locking means, for the axial displacement means, and for the bending block.

8. The roll stand according to claim 6, wherein the medium access is connected with piping.

9. The roll stand according to claim 7, wherein the medium access is connected with piping.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The drawings show exemplary embodiments of the invention.

(2) In the drawings:

(3) FIG. 1 shows a portion of a roll stand seen in the direction of the longitudinal axis of work rolls, which represents the solution according state-of-the-art;

(4) FIG. 2 shows a portion of a roll stand seen in the direction of the longitudinal axis of work rolls, which represents an embodiment according to the present invention;

(5) FIG. 3 shows a perspective view of the portion of the roll stand according to the embodiment of the invention shown in FIG. 2;

(6) FIG. 4 shows a perspective view of a section of FIG. 3 at an increased scale, which shows an arrangement of the displacement prevention means; and

(7) FIG. 5 shows a perspective view of a section of the roll stand, illustrating the medium access.

DETAILED DESCRIPTION

(8) A roll stand 1 shown in FIGS. 2 and 3, in principle, has the same elements which were described in connection with the discussion in the state-of-the-art (with reference to FIG. 1). As discussed, the work rolls (not shown) are arranged in respective work roll chocks 2, wherein the work roll chocks 2 are located in a roll housing 13 of the roll stand 1. For displacement of the work roll in direction of their longitudinal axis, axial displacement means 3 is provided.

(9) The work roll locking means 4 provides a connection between the axial displacement means 3 and the roll chock 2. To this end, for locking purposes, a tongue 7 is driven in a corresponding recess in the roll chock 2 by (hydraulic) displacement means 8.

(10) Further, there is provided a bending block 5 in which a bending cylinder is located in order to apply, in a known manner, a bending torque to the work rolls to influence the profile of the roll gap.

(11) Designing the axial displacement means 3 in form of a hydraulic cylinder requires, as a rule, that the axial displacement means 3 has a round outer shape. To avoid an undesired rotation, it should be supported against another component, without a possibility of rotation relative thereto. According to the invention, the axial displacement means 3 is supported against rotation by being supported against the bending block 5. To this end, there is provided a screw connection unit 6 formed of the above-mentioned elements, roll locking means 4, axial displacement means 3, and bending block 5. The screw connection unit 6 can be pre-assembled at the plant and then transported to an assembly site.

(12) The above-mentioned connection of the locking means 4 with the bending block 5 by the screw connection 6, advantageously, is carried out simultaneously for both upper and lower rolls, with the bending block 5 being already equipped with respective cylinders 12 for the upper and lower work rolls.

(13) To avoid open lubrication points, the bearing locations are combined. FIGS. 2 and 3 show that the bearing spots are already closed, preferably, with a round guide, so that for each roll housing, there are only four (4) points for one (1) closed bearing spot. Use of a sealed round guide means insures that the bearing spots are maintenance-free and, thus, 4 multiply by 2, that is eight (8) loss lubrication points are eliminated.

(14) For an integral unit formed of axial displacement means (displacement device), rotation preventing means, and bending block, displacement locking means 9 is provided, as shown in FIG. 4. The displacement locking means 9 secures the displacement device 3 in a predetermined position relative to the bending block 5. In this way, damage or injury from moving parts can be prevented.

(15) A further advantageous embodiment or effect of the proposed solution is illustrated in FIG. 5. It shows that an improved access of the medium connection, which results from elimination of the attachments to the roll housing, becomes possible. Further, thereby, a hard connection of all of the tubular junctions becomes possible. Potential leak points are reduced, and the piping system of the roll housing can be substantially simplified.

(16) Thus, the entire stand is substantially simplified, whereby substantial advantages in manufacturing and on-site assembly, and particularly, in maintenance of the roll stand are achieved.

LIST OF REFERENCE NUMERALS

(17) 1 Roll stand 2 Work roll chock 3 Axial displacement means 4 Work roll locking means 5 Bending block 6 Rotation prevention means 7 Tongue 8 Displacement means 9 Displacement prevention means 10 Medium access 11 Means for securing rotation prevention means to a roll housing 12 Bending cylinder 13 Roll housing