EP1151808B1 - Rolling mill, in particular skew rolling mill or Diescher rolling mill, of modular construction - Google Patents

Abstract

Rolling mill comprises a roll stand (4) consisting of opposite-lying portal frames (7, 8) fixed to a plate (6) with an upper cassette (9) for an upper rolling unit (11) and a lower cassette for a lower rolling unit (12). Both frames are tensioned and fixed to each other using several pulling elements (13) arranged above or next to each other. Preferred Features: Both portal frames are connected to each other using a cross frame (14). Rollers each consist of a lower drum unit (17b) with conical rolls (18).

Description

The invention relates to a rolling mill, in particular a diagonal or Diescherwalzwerk, in modular design, with rotatably mounted in a roll stand rollers, the Rolltooth is formed from Gussständern, welded sheet metal stands or forging stands, which are mounted on anchored in the foundation and cast sole plates.

For rolling mills, the framework stands of the known type are unreasonably large as a unit in manufacturing and handling. A scaffold stand is difficult and expensive to manufacture as a one-piece casting unit. The existing crane capacities, handling and processing set limits for the stator sizes. It has therefore begun to produce the rolling mill stands in modular design to handle smaller units easier. In addition, the balance of power between the resulting forces in the rolling process and the formation of Walzgerüstrahmens play a role.

The invention has for its object to simplify the production, handling and training of Walzgerüstrahmens to the effect that the production can be made easier and more economical, that the handling is facilitated by lower weights and that the structural design depending on the rolling process forces.

The object is achieved according to the invention that the Walzgerüstrahmen from opposite, fixed to the base plate portal frame with a distance between the portal frame forming upper cassette for an upper roller unit and a lower cassette for the lower roller unit is assembled, the two portal frame means several, one above the other and / or juxtaposed tension elements are braced and fixed together. This framework stand construction simplifies the stand construction and leads to lighter, more manageable modular units that can be produced economically. The modular design with only four module groups, two of which are the same or very similar, allows a more economically manageable design and manufacturing and with respect to the rolling process forces a centralization of the forces acting on the stand forces. In addition, advantages result from a load-optimized mass distribution, so that no superimposed voltage states arise. On the occasion of FEM investigations, a high rigidity of the scaffold stand was found, which increases the product quality. Furthermore, such a modular design allows any size chain. The construction method is about 15% cheaper, because the circle of material suppliers, eg for castings or forgings, expands. The flexibility of the own production and the acquisition of purchase can be increased thereby. The simpler production leads to shorter delivery times. This eliminates previous problems of material selection, whether forged or high quality sheets serve as the starting material.
Furthermore, the stretching force from the rolling process is taken up by the two portal frames and forwarded via the sole plate directly into the foundation. Other forces caused by the rolling process are absorbed by the cassettes and short-circuited.

An embodiment provides that the two portal frame are connected to each other below with a lower transverse frame.

An advantageous conclusion upwards results from the fact that a crosshead for roll removal or for roll installation between the portal frame in upper guides is displaced parallel. The lower transverse frame and the crosshead give the rolling forces occurring vertically to the portal frame on.

For one type of skew rolling mills, it is advantageous that the rolls each consist of a lower drum unit and an upper drum unit with tapered rollers. The invention is therefore very useful to apply to cone slanting mills.

For this purpose, it is further provided that at least the devices of the feed angle adjustment and the roller drum balance are attached to the cassettes.

For the development of the rolling mill to a Diescherwalzwerk is proposed that the tapered rollers at least one Diescherscheibe is assigned to each one Diescherscheibenschlitten which is movable on a transverse to the rolling direction slide from the operating position to a change position and back. In the conventional barrel or cone rolling mills the Diescherscheiben are mounted in wings on the long sides of the frame stand. The swiveling arrangement and the hydraulic locking on the rolling mill frame lead to "breathing" of the wings during the rolling process, which can have a negative effect on the rolling stock quality. Furthermore, lost by the known swing free space on both sides of the Walzgerüstrahmens by the pivoting of the wings, which would be better to use otherwise. The forces acting on the Diescherscheiben rolling forces are also absorbed by hydraulically actuated locks from the roll stand and lead to additional loads on the framework stands.

Another peculiarity arises from the fact that the Diescherscheibenschlitten can be fixed by means of a toggle lever lock on the slide. As a result, the positions are maintained accurately and safely during operation and while changing the Diescherscheibe.

Another improvement is that the die disc carriage is centered on a spatially mounted receptacle attached to the lower cassette.

In and of itself, disengageable propeller shafts are used for driving the rollers, such as e.g. is described in DE 43 32 893 C1. For further savings in space, however, it is proposed that the driving force can be transmitted to the rollers in the rolling stand each by means of a disengageable propeller shaft, in the quick-release coupling in the roller-side hit a hydraulically actuated clamp is provided. This saves on length, which benefits the installation space.

The design and manufacture of the rolling mill frame are influenced by other functions and facilities. Thus, it is provided according to additional features that the required installation space or the weight of the rolling mill frame is tuned to a minimized length of the roll axis. Thus, by choosing the cheapest drive can also be saved on construction volume of Walzgerüstrahmens.

In the drawing, an embodiment of the invention is shown, which will be explained in more detail below.

Fig. 1

eine Stirnansicht des Walzwerks, dass als Kegelschrägwalzwerk mit Diescherscheiben ausgerüstet ist,

Fig. 2

eine Draufsicht auf das Walzwerk gemäß Fig. 1,

Fig. 3

einen senkrechten Schnitt durch das Walzwerk parallel zur Walzrichtung,

Fig. 4

eine Einzelheit der Zentriermittel für den Diescherscheibenschlitten und

Fig. 5

einen Teil-Längsschnitt durch die ausrückbare Gelenkwelle des Walzwerksantriebs.

Show it:

Fig. 1

an end view of the rolling mill, which is equipped as cone cone rolling mill with Diescherscheiben,

Fig. 2

a top view of the rolling mill of FIG. 1,

Fig. 3

a vertical section through the rolling mill parallel to the rolling direction,

Fig. 4

a detail of the centering means for the Diescherscheibenschlitten and

Fig. 5

a partial longitudinal section through the disengageable PTO shaft of the rolling mill drive.

The rolling mill 1 may in particular consist of a cross rolling mill or Diescherwalzwerk and is assembled in modular construction of individual groups. In the rolling mill 1, an upper roller 2 and a lower roller 3 are rotatably mounted and as usual employable. The rolling mill frame 4 is formed either of cast iron or welded sheet metal stands or forgings. The stands are anchored in the foundation 5 and cast and fixed on the base plate 6.

The rolling mill frame 4 consists of two spaced apart portal frames 7 and 8, the distance of which is determined by an upper cassette 9 and a lower cassette 10. The upper roller 2 and the upper cassette 9 form an upper roller unit 11 and the lower roller 3 and the lower cassette 10 form a lower roller unit 12. The composite of the two portal frames 7 and 8 is completed by tension members 13 which are formed as expansion elements and capture the rolling forces in a preload expansion range.

The two portal frames 7, 8 are connected to a lower transverse frame 14 with each other and above the connection by means of a crosshead 15 is created.

The crosshead 15 is displaceably guided in two-sided guides 16a and 16b for a roll removal and for a roller installation between the portal frames 7 and 8 (FIG. 3).

The rollers 2, 3 are part of an upper drum unit 17a and a lower drum unit 17b. The rollers 2, 3 are executed in the embodiment as tapered rollers (Fig. 3).

The devices of the feed angle adjustment 19 and the roller drum balancing 20 are hinged to the cassettes 9 and 10.

Each of the tapered rollers 18 is assigned a die plate 21a and 21b (FIGS. 1 and 2). The Diescherscheiben 21a and 21b are each on a transversely to the rolling direction 22 extending slide 23 guided Diescherscheibenschlitten 24a and 24b back and forth. Referring to Figs. 1 and 2, the left die disc 21a is shown in the operative position while the right die disc 21b is out of the operating position in a service position where a die plate may be replaced, e.g. in the case of a dimensional change of the rolling stock 25. The Diescherscheibenschlitten 24a, 24b can each be fixed by means of a toggle lever 26a, 26b on the slide 23. In this case, the respective Diescherscheibenschlitten 24a, 24b is centered on a fixed to the lower cassette 10, spatially placed receptacle 27 (Fig. 4).

According to FIG. 5, the drive force is transmitted to the rollers 2, 3 in the rolling frame 4 in each case by means of a disengageable propeller shaft 28. The propeller shaft 28 has a quick-release coupling 29, wherein in the roller-side hit 30, a hydraulically actuated clamp 31 is installed relative to the roller shaft 32. The required installation space and thus the weight of the rolling mill frame 4 is thereby matched to a minimized length of the roll axis 32 and saves installation space.

LIST OF REFERENCE NUMBERS

1

rolling mill

2

upper roller

3

lower roller

4

Stand frame

5

foundation

6

foundation slab

7

portal frame

8th

portal frame

9

upper cassette

10

lower cassette

11

upper roller unit

12

lower roller unit

13

tension element

14

lower cross frame

15

crosshead

16a

guide

16b

guide

17a

upper drum unit

17b

lower drum unit

18

tapered roller

19

Feed angle adjustment

20

Roll-balancing drum

21a

Diescher disk

21b

Diescher disk

22

rolling direction

23

slipway

24a

Diescher disc

24b

Diescher disc

25

rolling

26a

Toggle locking

26b

Toggle locking

27

spatially arranged recording

28

disengageable PTO shaft

29

Quick Couplings

30

roll side hit

31

hydraulic clamping

32

roll axis

Claims (10)

1. A rolling mill, particularly an oblique or Diescher rolling mill, constructed modularly, having rollers (2, 3) supported in pivotable manner on a roll stand (1), the roll stand frame (4) being constructed from cast metal columns, welded sheet metal columns, or wrought metal columns that are secured to bearing plates (6) which are cast and anchored in the foundation (5),
   characterised in that
   the roll stand frame (4) can be assembled from gantry frames (7;8) secured opposite one another on the bearing plate (6), with an upper cradle (9) for the upper rolling unit (11) creating the separation between the gantry frames (7;8) and a lower cradle (10) for the lower rolling unit (12), wherein the two gantry frames (7;8) are braced against and fixed to each other via a plurality of tie members (13) that are disposed above and/or beside each other.
2. The rolling mill as recited in claim 1,
   characterised in that
   the two gantry frames (7;8) are attached to each other at the bottom via a lower cross frame (14).
3. The rolling mill as recited in either of claims 1 or 2,
   characterised in that
   a cross head (15) is slidable in upper guides (16a, 16b) between the gantry frames (27;8) and parallel thereto to enable the rollers to be mounted or dismounted.
4. The rolling mill as recited in any of claims 1 to 3,
   characterised in that
   each of the rollers (2;3) is constructed from a lower drum unit (17a) and an upper drum unit (17b) with tapered rollers (18).
5. The rolling mill as recited in any of claims 1 to 4,
   characterised in that
   at least the devices of the feed angle adjustment (19) and the roller-drum-counterbalance (20) are secured to the cradles (9;10).
6. The rolling mill as recited in either of claims 4 or 5,
   characterised in that
   at least one Diescher disc (21a, 21b) on each Diescher disc carriage (24a;24b) is allocated to the conical rollers (18), which carnage is movable from the operating position to a changing position and back along a contact surface (23) extending transversely to the rolling direction (22).
7. The rolling mill as recited in either of claims 5 or 6,
   characterised in that
   the Diescher disc carriage (24a;24b) can be fixed on the contact surface (23) via an elbow lever locking mechanism (26a;26b).
8. The rolling mill as recited in any of claims 4 to 7,
   characterised in that
   the Diescher disc carriage (24a;24b) is centered on a spatially positioned retaining device (27) that is secured on the lower cradle (10).
9. The rolling mill as recited in any of claims 1 to 8,
   characterised in that
   the driving force can be transferred to each of the rollers (2;3) in the roll stand frame (4) via a disengageable articulated shaft (28), and a hydraulically operable clamp (31) is provided in the quick release coupling (29) of the shaft in the roller-side strike plate (31).
10. The rolling mill as recited in any of claims 1 to 9,
    characterised in that
    the necessary installation space and the weight of the roll stand frame (4) is sychronised with a minimised length of the roller axle (32).

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