JPH0155046B2 - - Google Patents

Description

Detailed description of the invention: Industrial field of application A rolling stand for a rolling mill for rolling bars, comprising a camwaltz transmission and an exchangeable roll casing, with bearings mounted on the roll casing. The invention relates to a type in which a pair of rolled rolls is connected via a releasable drive connection to a driven shaft of a camwaltz transmission.

Conventional technology When manufacturing a steel bar, the material is rolled into a desired final cross section by passing it many times according to a pass plan; This is carried out one after the other on a rolling mill with rolling stands. If it is necessary to roll to a finished dimension that is smaller than the starting dimension, a very large number of passes are required to obtain the final cross section, and the overall length of the mill increases. Significantly higher passing speeds in the terminal range,
This provides only a small amount of time for recrystallization etc. for the rolled material between each pass, and such rolling mills are therefore unsuitable for high-alloy steels. Hitherto, such bars of high alloy steel have been rolled in individual open, reversible rolling stands in a laborious and concentrated operation. All known devices are therefore very expensive and require a large amount of space. This disadvantageous relationship becomes even more disadvantageous when rolling high-grade steels, such as high-base metal steels, since the degree of cross-sectional reduction with each pass is small.

Various types of rolling stands with replaceable roll casings are already known in order to facilitate roll changes based on wear phenomena or for the purpose of changing the roll profile. Of course, all these roll casings are always equipped with rolls, bearings and drives of the same size and cannot influence the structure and working type of the rolling mill.

OBJECT OF THE INVENTION The object of the present invention is therefore to avoid the above-mentioned disadvantages, to have a good possibility of being easily adapted to different rolling programs, and, above all, to be possible with a low space requirement and low cost. in,
It is an object of the present invention to provide a rolling stand of the type mentioned at the outset, which provides a rolling mill arrangement that makes it possible to economically roll bars made of high-alloy steel in a wide range of sizes.

Means for Solving the Problem According to the present invention, which solves this problem, a roll casing is provided with a roll having a roll body diameter and a roll journal diameter designed in accordance with a predetermined cross section of a bar to be rolled. In addition, at least one auxiliary roll casing is provided with rolls having a roll journal diameter designed for a cross-section smaller than the predetermined cross-section of the bar to be rolled. Assigned to the camwaltz transmission, the auxiliary roll casing is additionally configured to the changed roll dimensions for the rolls of the roll casing in order to maintain the rolling center line of the roll casing. It is adapted to be connected to a camwaltz transmission via a drive connection.

Operation and Effects In contrast to normal replacement casings for simply replacing worn rolls with new identical rolls, such auxiliary roll casings can be used for rolling mills with different rolling dimensions and thus for rolling cross sections. You can change the range. Thereby, a relatively small rolling mill with only a few rolling stands is sufficient to roll the bar in one pass or in more than one pass to virtually any cross-section in each case. It is. In this case, it is only necessary to replace the roll casing with an auxiliary roll casing after each passage of the rolling material, or to replace an already installed auxiliary roll casing with a corresponding new auxiliary roll casing. The auxiliary roll casing is provided with rolls of different size for each pass. Since these rolls form the same rolling axis and their rotational speed is determined in each case to the same rolling material passing speed, the best rolling conditions are obtained for the respective cross section. By being able to replace the roll casing designed for the maximum roll diameter with a corresponding auxiliary roll casing, it is possible to use existing rolling mills optimally and economically.

For example, by installing one roll casing and two auxiliary roll casings in one rolling mill with eight rolling stands (the first four rolling stand groups: the roll diameter of the roll casing is 600 mm, the first The roll diameter of the auxiliary roll casing is 450 mm, the roll diameter of the second auxiliary roll casing is 320 mm; the following four rolling stand groups: the roll diameter of the roll casing is 520 mm, the first
The roll diameter of the auxiliary roll casing is 380 mm, the roll diameter of the second auxiliary roll casing is 280 mm),
In a total of three passes, the bar initially having a diameter of 100 mm is rolled to a final diameter of 12.5 mm by reducing the cross section by 75% each time. Previously, this required the arrangement of three complete rolling mills independent of each other. According to the invention, only a separate auxiliary roll casing is always required for each rod to pass through, and all other equipment from the camwaltz transmission to the control device can be used as is; The manufacturing costs are significantly lower compared to known devices. This naturally reduces the capacity of the rolling mill, but it also means that the load on the mill due to the small demand for bars of precious metal or similar materials is also reduced.

Suitable drive connections between the roll housing and the camwaltz transmission are in each case releasable couplings, cardan shafts or the like, but couplings consisting of parts that can be separated from one another are particularly preferred. In this case, according to a further embodiment of the invention, an intermediate gear inserted between the camwaltz transmission and the auxiliary roll casing is used as an additional drive connection,
The intermediate gear has a coupling part on the inlet side of the connection to one driven shaft of the camwaltz transmission, which coupling part is attached to the driven shaft of a coupling for the roll casing connection. It has become possible to cooperate with the parts that have been
An advantageous construction is obtained if a coupling consisting of mutually separable parts is provided for the driving connection of the intermediate gear and the auxiliary roll casing. By means of such an intermediate gear, the distance between the cam waltz transmission and the auxiliary roll casing, which is limited by the different roll dimensions and the constant rolling center line, can be easily bridged, in which case at the same time the drive rotation The number can be adjusted to the dimensional difference of the rolls. The intermediate gear is preferably removable from the auxiliary roll casing, but can also be assembled together with this auxiliary roll casing as a single structural unit.

Although the rolling stand according to Austrian Patent No. 370 643 is compact in its construction and already offers the possibility of economical roll changes and is suitable for installation in the rolling mill according to the invention, the invention According to a further embodiment, it is further provided that an auxiliary roll casing can be attached to the outer bearing pin by means of a bearing part in accordance with the roll casing, and from the exchange position surrounds the intermediate gear and is connected to the camwaltz transmission. The intermediate gear, which can be swiveled into a close-coupled position or vice versa, is itself supported in a bearing on a bearing pin inside the Camwaltz transmission. In this embodiment, as well as the roll casing, the auxiliary roll casing and the intermediate gear can be mounted or removed quickly and without problems. In this case, the auxiliary roll casing for the Camwaltz transmission also has the function of a gear cover, so that the sealed structural unit has all the advantages associated with a sealed transmission, coupling devices, lubrication conditions, etc. There is.

Embodiment Next, the structure of the present invention will be specifically described with respect to an embodiment shown in the drawings.

The rolling stand, designated as a whole by the reference numeral 1, has a camwaltz transmission 2 with two driven shafts 3 for driving the rolls and for placing the rolls in close contact with the receiving roll casing. A closing wall 4 is formed on the roll side, and
A bearing pin 5 and a hydraulic high-speed tightening device 6 are provided on the outside to support and secure the roll casing.

As can be seen in FIG. 1, the camwaltz transmission 2 is fitted with a cassette-shaped roll casing 7. This roll casing 7 is supported by a bearing pin 5 via a bearing part 8, and is supported by a high-speed tightening device 6.
It is closely, but loosely fixed to the closing wall 4 by. A pair of rolls 9 is mounted in the roll housing 7, with eccentric bushings 11, 12 for the roll bearings, which are rotationally adjustable via an adjusting device 10, bringing the pairs of rolls 9 radially close to each other. Oldham-Kupplung 1 is used to form a driving connection between the roll pair 9 and the driven shaft 3 of the Camwaltz transmission 2.
3 is used. This Oldham joint 13 consists of mutually separable parts 13', 13'' and not only provides the necessary torque transmission, but also compensates for the lateral deviations created by bringing the roll pairs 9 closer together. will also be compensated.

In order to be able to adapt the rolling stand 1 to a wide range of different rolling programs, the camwaltz transmission 2 is assigned an auxiliary roll casing 7' of smaller dimensions, as shown in FIG. The auxiliary roll casing 7' is attached to the camwaltz transmission 2 with an intermediate gear 14 interposed therebetween instead of the roll casing 7.
This auxiliary roll casing 7' is attached to a cover plate 7'' which is fitted to the closing wall 4. This cover plate 7'' likewise has a shaft receptacle 8' for the bearing pin 5. and is fixed by a high-speed tightening device 6. The auxiliary roll casing 7' has a roll pair 9' having smaller dimensions than the roll pair 9. This pair of rolls 9' is rotatably adjustable via eccentric bushings 11', 1 via an adjusting device 10' in order to be able to approach each other in the radial direction.
2'. In this case, the rolling center line of the roll pair 9' always coincides exactly with the rolling center line defined by the roll pair 9 of the roll casing 7. In order to bridge the distance from the roll pair 9' to the cam waltz transmission 2 and to adjust the roll rotation speed in accordance with the dimensional changes of the roll pair 9' reduced relative to the roll pair 9, an intermediate gear 14 is provided. The intermediate gear 14 is supported via a bearing 15 on an inner bearing pin 16 of the camwaltz transmission 2 and is located in a chamber formed by the closing wall 4. This intermediate gear 14 has two driven shafts 3', and a roll pair 9' is connected to these two driven shafts 3' via mutually separable parts 17' and 17'' by an Oldham joint 17. For connection to one of the driven shafts 3 of the camwaltz transmission 2, the intermediate gear 14 has a coupling part 13 on the input side.This coupling part 13 has a coupling part 13 for the roll pair 9'. In cooperation with the part 13' present in the Oldham coupling 13, it transmits the driving force from the Camwaltz transmission.

By associating two or more roll casings in one common camwaltz transmission, the rolling stand can be adapted economically and inexpensively to rolls of different sizes,
For example, in small-sized rolling mills made up of these rolling stands, it is possible to pass the rolled material through multiple rolling passes, and it is possible to carry out rolling over large areas with small-sized equipment. For this purpose, the roll casing 7 can be removed after one rolling pass and the intermediate gear 14 and the auxiliary roll casing 7' can be installed in its place, or the intermediate gear 14 and the auxiliary roll casing 7' can be replaced by other suitable means. It is only necessary to replace the size of the intermediate gear and the auxiliary roll casing.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view of a rolling stand according to an embodiment of the present invention with a roll casing attached thereto, and FIG. 2 is a partial cross-sectional view of a rolling stand with an auxiliary roll casing attached thereto. DESCRIPTION OF SYMBOLS 1... Rolling stand, 2... Camwaltz transmission, 3, 3'... Driven shaft, 4... Closing wall, 5...
...Bearing pin, 6...High speed tightening device, 7...Roll casing, 7'...Auxiliary roll casing,
7″……Cover plate, 8,8′……Bearing part,
9, 9'... Roll pair, 10, 10'... Adjusting device, 11, 11', 12, 12'... Eccentric bushing, 13... Oldham joint, 13', 13''... Part, 13... ... Coupling part, 14 ... Intermediate gear, 15 ... Bearing section, 16 ... Bearing pin, 17
...Oldham-Cupling, 17', 17''...
…part.

Claims (1)

[Scope of Claims] 1. A rolling stand for a rolling mill for rolling bars, comprising a cam waltz transmission and a replaceable roll casing, with a pair of rolls bearing on the roll casing. A roll cylinder designed for a given cross-section of the bar to be rolled, in which the roll cylinder is connected via a releasable drive connection to the driven shaft of a camwaltz transmission. In addition to the roll casing 7 with the rolls 9 having the diameter and roll journal diameter, the bar to be rolled is
At least one auxiliary roll casing 7' is assigned to the camwaltz transmission 2, with a roll 9' having a roll body diameter and a roll journal diameter designed for a cross-section smaller than the predetermined cross-section; The auxiliary roll casing 7' has an additional drive connection 14 configured for the roll dimensions varied for the rolls of the roll casing 7 in order to maintain the rolling center line of the roll casing 7. and is connected to the cam waltz transmission 2,
rolling stand. 2. A drive connection with a coupling consisting of mutually separable parts is provided between the camwaltz transmission 2 and the roll casing 7'; Intermediate gear 1 inserted between
4 is used, the intermediate gear 14 having a coupling part 13 on the inlet side of the connection to one driven shaft 3 of the camwaltz transmission 2, which coupling part 13 is connected to the roll casing. The coupling coupling 13 is adapted to cooperate with a part 13' mounted on the driven shaft 3 and is separated from each other in order to drive the intermediate gear 14 and the auxiliary roll casing 7'. Coupling 1 consisting of possible parts 17', 17''
7. The rolling stand according to claim 1, wherein: 7 is provided. 3. has a roll casing closely connected to the uncovered camwaltz transmission, the roll casing being mounted via a downwardly opening bearing part on the outer bearing pin of the camwaltz transmission; The auxiliary roll casing 7' is pivotably supported from the gear engagement position to the exchange position or from the gear exchange position to the engagement position, and the auxiliary roll casing 7' is supported by the outer bearing pin by the bearing part 8' according to the roll casing 7. 5 and pivotable from an exchange position into a close engagement position with the cam waltz transmission 2 surrounding the intermediate gear 14 or from said engagement position into an exchange position, said intermediate gear 14 itself is supported with a bearing part 15 on a bearing pin 16 inside the camwaltz transmission 2,
A rolling stand according to claim 2.