Roll arrangement

Abstract

A roll arrangement for rolling rolling material in a rolling system. The roll arrangement includes a roll that is rotatably mounted by its roll journal in a bearing bush of a chock. A ring gap for receiving a lubricant is formed between the bearing bush and the roll journal. The ring gap is sealed both on the ball side of the chock and on the side of the chock away from the balls, using sealing rings. In order to increase the load capacity or the rolling force of a roll arrangement while maintaining or reducing the construction size thereof and without the roll arrangement overheating, discharge channels are provided in a through-flow angular range of the bearing bush for discharging the lubricant out of the ring gap into an oil-receiving chamber.

Claims

1. A roll arrangement for rolling rolling material in a rolling system, comprising: a roll with a roll barrel and a roll journal; a chock with a bearing bushing arranged for rotation with the chock and having a receiving opening for receiving the roll journal, wherein the receiving opening has an inside diameter larger than an outside diameter of the roll journal so that an annular gap for receiving a lubricant remains between the bearing bushing and the roll journal; a sealing ring which is arranged against the bearing bushing on an end of the receiving opening on a roll barrel side for sealing the annular gap; at least one oil receiving chamber; and a sealing ring arranged against the bearing bushing on an end side of the receiving opening remote from the roll barrel for sealing the annular gap; wherein the bearing bushing, as seen in a circumferential direction, is divided into a through-flow angular region and a shut-off angular region; wherein, in the through-flow angular region, the bearing bushing has at least one discharge channel for conducting the lubricant out of the annular gap into the oil receiving chamber; wherein the through-flow angular region extends adjacent to the shut-off angular region over an angular range of 360 minus the shut-off angular region; wherein the bearing bushing is configured so that the shut-off angular region, starting from A+, wherein 10<<35, extends by a maximum of 270 counter to a direction of rotation of the roll, wherein A is a supporting load point represented by the angular position of a narrowest gap between the roll journal and the chock in event of a load.

2. The roll arrangement according to claim 1, further comprising a journal bushing arranged on the roll journal for rotation therewith; wherein the receiving opening of the bearing bushing is configured to receive the roll journal together with the journal bushing; and wherein the annular gap for the lubricant is formed between the bearing bushing and the journal bushing.

3. The roll arrangement according to claim 1, wherein, in the event of a load, the supporting load point is arranged in an angular range of =+/25 with respect to a center axis Y of the roll, said center axis being perpendicular to a plane of the rolling material.

4. The roll arrangement according to claim 1, wherein the at least one oil receiving chamber includes a barrel-side oil receiving chamber between the chock and the roll barrel and a barrel-remote oil receiving chamber at a barrel-remote end of the roll journal.

5. The roll arrangement according to claim 4, wherein, in the through-flow angular region, the bearing bushing has at least one barrel-side discharge channel for a fluid-conducting connection of the annular gap to the barrel-side oil receiving chamber and at least one barrel-remote discharge channel for fluid-conducting connection of the annular gap to the barrel-remote oil receiving chamber.

6. The roll arrangement according to claim 4, wherein the at least one discharge channel runs from the bearing bushing through the chock and opens from the chock into one of the at least one oil receiving chambers.

7. The roll arrangement according to claim 6, wherein the at least one discharge channel includes a plurality of discharge channels arranged next to one another in the circumferential direction within the through-flow angular range.

8. The roll arrangement according to claim 1, wherein the at least one discharge channel has a slot-shaped cross section that extends in the circumferential direction within the through-flow angular range.

9. The roll arrangement according to claim 1, wherein the at least one discharge channel includes a plurality of discharge channels arranged next to one another in the circumferential direction within the through-flow angular region.

10. The roll arrangement according to claim 1, wherein, in the through-flow angular region, the bearing bushing has a collecting oil pocket on an inner side facing the roll journal; and wherein the at least one discharge channel is in fluid-conducting connection to the collecting oil pocket.

11. The roll arrangement according to claim 1, wherein the roll is a working roll, a supporting roll or an intermediate roll.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a first exemplary embodiment of the roll arrangement according to the invention in a longitudinal section;

(2) FIG. 2 shows the roll arrangement according to the invention in a cross section;

(3) FIG. 3 shows a second exemplary embodiment of the roll arrangement according to the invention;

(4) FIG. 4 shows a third exemplary embodiment of the roll arrangement according to the invention; and

(5) FIG. 5 shows the bearing bushing according to the invention with various variants for the discharge channels.

DETAILED DESCRIPTION OF THE INVENTION

(6) The invention is described in detail below in the form of various exemplary embodiments with reference to the figures mentioned. In all of the figures, identical technical elements are denoted by the same reference sign.

(7) FIG. 1 shows a first exemplary embodiment of the roll arrangement 100 according to the invention. The roll arrangement 100 comprises a roll 110 with a roll barrel 112 and a roll journal 114. In a rolling stand, the roll is mounted rotatably in a chock 120, put more precisely in a bearing bushing 130 which is arranged in the chock for rotation therewith. The bearing bushing 130 has a receiving opening for receiving the roll journal 114, wherein the inside diameter of the receiving opening is designed to be larger than the outside diameter of the roll journal or of the journal bushing 116 placed on the latter in such a manner that an annular gap 180 for receiving a lubricant, typically oil, remains between the bearing bushing and the roll journal or the journal bushing 116; see FIG. 2.

(8) A sealing ring 140 is arranged on the end side of the receiving opening on the roll barrel side for sealing the annular gap there in relation to a receiving chamber 160 on the roll barrel side. Analogously, a further sealing ring 150 is arranged on the end side of the receiving opening remote from the roll barrel for sealing the annular gap 180 there in relation to the oil receiving chamber 170 there which is remote from the roll barrel.

(9) As shown in FIG. 1, the bearing bushing 130 has at least one discharge channel 132 for conducting the lubricant out of the annular gap 180 into one of the oil receiving chambers 160, 170. In the case of the first exemplary embodiment shown in FIG. 1, a barrel-side discharge channel 132-1 and a barrel-remote discharge channel 132-2 are provided for conducting oil out of the annular gap 180. For this purpose, the discharge channels 132-1, 132-2 are connected in a fluid-conducting manner to the annular gap and to the respective oil receiving chamber 160, 170. As shown in FIG. 1, the discharge channels extend, by way of example in portions, in the radial and axial direction.

(10) FIG. 2 shows a cross section through the roll arrangement according to the invention under the load of the rolling force F which here acts by way of example in the direction of the center plane Y. Owing to the interaction of action and reaction of the rolling force F, the roll journal 114 is displaced, optionally together with the journal bushing 116, eccentrically within the bearing bushing 130, and therefore an asymmetrical annular gap 180 or an asymmetrical oil film arises. At the position of the supporting load point A, the annular gap 180 assumes the minimum height or thickness h.sub.min.

(11) According to the invention, the bearing bushing 130as seen in the circumferential directionis divided into a through-flow angular range and a shut-off angular range which is understood as meaning the difference between 360 and the through-flow angular range . The shut-off angular range extends, starting from A+ with 10<<+35 by a maximum of 270 counter to the rotational direction of the roll. Accordingly, the through-flow range is defined as the complementary angular range to the shut-off angular range, i.e. 360 minus the shut-off angular range . In the event of a load, the supporting load point A lies in an angular range of =+/25 with respect to the center axis Y of the roll, said center axis being perpendicular to the plane of the rolling material.

(12) FIG. 3 shows a second exemplary embodiment for the roll arrangement, put more precisely for a possible guide of the discharge channels 132. Specifically, the second exemplary embodiment makes provision for the barrel-side and the barrel-remote discharge channels 132-1, 132-2 to be guided not onlystarting from the annular gap 180in the radial direction through the bearing bushing 130 but also away from the latter through the chock 120 in order to emerge, preferably in the axial direction, on the end sides thereof into the respective oil receiving chambers 160, 170.

(13) FIG. 4 shows a third exemplary embodiment for the arrangement according to the invention, in particular for a possible guiding of the discharge channels. A particular characteristic here can be seen in that the bearing bushing 130 has an oil collecting pocket 136 on its inner side facing the roll journal 114 and that the at least one discharge channel 132-1, 132-2 is in fluid-conducting connection to the oil pocket 136. The oil pocket is a local recess on the inner side of the bearing bushing and in this respect the oil pocket acts as a local volumetric increase of the annular gap; in the region of the oil collecting pocket, the thickness of the annular gap 180 and therefore the thickness of the oil film located therein are increased.

(14) According to the invention, the discharge channels 132, 132-1, 132-2 are always formed only in the through-flow angular range , but never in the shut-off angular range .

(15) FIG. 5 shows possible arrangements and cross-sectional shapes for the discharge channels. The cross-sectional shapes shown there, slit-shaped, round or rectangular, should be understood as merely being by way of example; of course, the discharge channels can have any desired cross-sectional shape. It is advantageous if the discharge channels extend in the circumferential direction of the bearing bushing, whether it be, for example, slot-shaped, shown on the left in FIG. 5, or in the form of a plurality of singular discharge channels arranged distributed in the circumferential direction, as shown on the right in FIG. 5.

LIST OF REFERENCE SIGNS

(16) 100 Roll arrangement 110 Roll 112 Roll barrel 114 Roll journal 116 Journal bushing 120 Chock 130 Bearing bushing 132 Drain channel 132-1 Barrel-side discharge channel 132-2 Barrel-remote discharge channel 136 Oil pocket 140 Sealing ring on the roll barrel side 150 Sealing ring remote from the roll barrel 160 Barrel-side oil receiving chamber 170 Barrel-remote oil receiving chamber 180 Annular gap Shut-off angular range Through-flow angular range Angular range for supporting load point A Supporting load point Y Angle