EP0432532A2 - High performance bar or wire rolling mill - Google Patents

Abstract

In a high-performance bar or wire rolling mill, especially for the single-strand twist-free rolling of rolling stock, with a roughing train 1 having in each case a plurality of roll stands or roll units, at least one intermediate train 2 and an adjoining finishing train 3 with a subsequent finishing block 4 if required, it is proposed that roll changing be carried out in accordance with the minimised sequence of passes in each mill section, the changing of the rolls in the roughing train 1 being carried out with crane tools 15, in the intermediate train 2 with manipulators 16 and in the finishing train 3 by means of rapid-change devices 17 and in addition by means of manipulators 16 if required, all the roll stands or roll units in the individual mill sections 1 to 4 having removable rolls 18, 31, 32, 46 in floating mounts in order to increase the availability and output of the rolling mill. <IMAGE>

Description

The invention relates to a high-performance steel bar / wire mill, in particular for the single-core, twist-free rolling of rolling stock, each with a plurality of roll stands or rolling units comprising a roughing train, at least one intermediate train and a subsequent finishing train with, if appropriate, a subsequent finishing block.

In recent years, the development of wire rod production has been very stormy due to the use of new technologies such as Morgan block and Stelmor cooling devices. The maximum speed could be increased from approx. 35 m / s to over 100 m / s; the piercing cross-sections were increased from 80 mm in diameter to 150 mm in diameter and the ring weights could be tripled. The consequence of this development is that it was possible to switch from four / three-core to two- or one-core lines with all the advantages with regard to the output and utilization of the production facilities. Regarding the arrangement of the rolling stands, it should be noted that with normal steel grades, especially with planned multi-core rolling, the continuous horizontal stand type for both the roughing and the intermediate line order was chosen. With this arrangement, depending on the caliber shape, it must be twisted between the stands. The requirements placed on the surface qualities and tolerances allow such a procedure in most cases.

In cases where higher demands are made, the intermediate streets are split up and equipped with scaffolds in a horizontal-vertical arrangement with appropriate devices for draft-free rolling. This is particularly important for the creation of garret dimensions with a good surface and tolerance.

For medium and high-alloy steels and grades with a special surface quality, a horizontal-vertical arrangement is required for the entire rolling mill, since these qualities usually no longer allow twisting. In addition, it should be mentioned that roller guides between the scaffolding are used as far as possible to achieve a perfect surface quality.

Depending on the wire qualities to be rolled, various twist-free prefabricated block types have also been developed. The individual horizontal-vertical rolling units of the finishing block have overhung carbide rolling rings.

Regarding the current state of the technical development of wire rod mills, it must be said that these have to be designed more and more to meet the special needs of the operators, because it is important to improve the efficiency of the wire rod mill and to adapt it more easily to the respective product programs, to increase the output and the To ensure high-tech quality of the product.

The object of the invention is to optimize the individual road sections of the steel bar / wire mill, in particular to increase their availability, to roll the wire or the bar steel in all road sections without twists and to reduce the plant costs by the optimized use of rolling mill with certain predetermined properties.

This object is achieved with a high-performance steel bar / wire mill of the type described in the preamble of claim 1 and with the characterizing features of this claim 1. Further refinements of the high-performance rolling mill are characterized by claims 2 to 10.

According to claim 1, the roll change in the high-performance steel bar / wire mill takes place in accordance with the minimized caliber series in each street section, namely in the roughing train by means of a crane tool, in the intermediate line by means of a manipulator and in the finishing train by means of a quick-change device, if necessary additionally by means of a manipulator, all roll stands or Roll units in the individual road sections have rollers mounted on the fly. The design of the entire rolling mill with roll stands or rolling units with flying roll shafts, on which the rolling rings are mounted, allows short changeover times, ie no long conversion times are necessary, so that the mill is practically always ready for rolling. No interchangeable scaffolds are required. Due to the fact that the roll change is provided in accordance with the minimized caliber series, the roll change can take place according to the frequency and the necessity taking into account the wear condition and the quality assurance, whereby the most suitable and optimally adapted to the changing process and the roll weight taking into account changing devices will. The result shows a twist-free rolling of the rolling stock in the entire rolling mill with high availability and a rolled product with high quality and quality.

In an embodiment of the invention it is provided that, for the purpose of swirl-free rolling of the rolling stock, intermediate and intermediate mill have horizontal-vertical compact stands in an alternating sequence, that the finishing train seen in the rolling direction initially consists of horizontal and vertical compact stands, followed by a vertical - And horizontal rolling unit having a rolling block, the horizontal rolling unit of which can only be used for separating rolling of the rolling stock in two separate rolling cores, while the vertical rolling unit can be used for normal rolling of the rolling stock and that the finishing block consists of several horizontal and vertical rolling units in a 45 ° arrangement Roll rings exist, which are attached to a basic frame. This design of the individual road sections has several advantages: The space required for the scaffolding is minimized. The overall length of the rolling mill is reduced because the compact stands can be positioned close together; no roller tables between the scaffolding are required. Due to the standardization of the optimized roll change, the storage of spare parts is low. The changeover times are reduced. The proposed use of a two-stand vertical-horizontal mini-block with overhung rollers is particularly advantageous as a replacement for the tilting and rotating stands previously used if, for example, the single-wire rolled rolling stock is to be subjected to a separating roller. Because in the case of separation rolling of the rolling stock, only the horizontal rolling unit of the stand is used for the separation stitch, while in the case of normal rolling only the vertical roller unit is in operation. The other roller unit is simply left empty or the corresponding roller cassette is removed.

In a further embodiment of the invention, it is proposed that the horizontal-vertical rolling block for the last passages of the separating roll be followed by two duo roll stands with the rolling sequence from the oval caliber to the round caliber. So if the horizontal rolling unit of the horizontal-vertical rolling block in the finishing train is used for separating rolling of the rolling stock - the vertical rolling unit of the rolling block does not perform any rolling work - each strand of the rolling stock separated into two roll cores is rolled up in the horizontal stands by means of rolls with two calibers each Rolled far enough that the formed rolled stock can then be driven onto the cooling bed as finished bar steel.

A further advantageous embodiment of the invention is shown in that the vertical-horizontal rolling block of the finishing train for the last passages of the separating roll is followed by two compact rolling blocks each having a horizontal and a vertical rolling unit. The use of two two-stand compact rolling blocks for the last two passes after the rolling of the rolling stock enables the horizontal duo stands, which are arranged downstream, to be replaced. As a result, each rolling wire is rolled without twists. The entire rolling mill can therefore also be equipped with overhung roller rings in the case of separating rolling. Tungsten carbide rolling rings with a long service life can also be used. The set-up times and the maintenance times of the rolling mill can be reduced even further. The use of the compact scaffolding allows a short construction of the finishing train in the sense of a reduced space requirement.

In order to reduce the set-up times or the maintenance times in the roughing train or to increase the availability of this section of the street, according to a further proposal of the invention, a C-shaped carrier tool pivotably attached to a crane bridge is used to change the rolling rings of at least the horizontal compact stands , at the lower center of gravity of which a common changing device for the rolling rings is arranged. Since the rolling rings in this section of the road have a very high weight of about 150 to 450 kilograms, on the other hand they have a comparatively long service life of several days with maximum permissible rolling capacity, the use of the roller changing device proposed here is optimally adapted to the rolling technology in the roughing mill, both with regard to the structural effort and the time required for the changing device.

The same advantages can be seen in the intermediate line if, in a suitable adaptation to the rolling technology, the overhung roller rings of the stands are changed with the aid of a manipulator that can be moved on all sides, the head of which carries the changing device for the roller rings of the compact stands and which can be controlled manually. Since in this section of the road the weights of the rolling rings are already significantly reduced compared to those in the roughing mill, and on the other hand their average lifespan is also reduced, a changeover device is therefore provided that is easy to use by the maintenance personnel and a correspondingly quick and exact change of the processed rolling rings permits new rolling rings.

The advantage of changing the rollers in accordance with the minimized caliber series is particularly clear in every section of the finishing train, if there is another Proposal of the invention, a quick-change device is used, which has a liftable and rotatable, if appropriate, displaceably designed and arranged on a movable change carriage change device for the two corresponding rolling rings of each vertical and horizontal stand. The rolling rings in these sections of the road are subject to high loads, among other things, due to the high rolling speed and, despite the best choice of materials such as tungsten carbide, only have an average life of around one to two days with maximum rolling performance. The invention with the proposed quick-change device does justice to the need for quick and accurate roller change that can be controlled from a control room. A further improving embodiment of the invention provides that the roll changing device has at least two receiving devices pivotable about its axis of rotation for a mounting frame receiving at least the rolling rings. As a result, the maintenance personnel are given the opportunity to hold new rolling rings on a building site ready for assembly, which are inserted into the receiving device of the mobile changing device. The receiving device is then pivoted accordingly and the finished rolling rings are placed on the site for further handling. Then the change car is driven back into the road section. The individual processes when changing the roll can thus be carried out using conventional control or Control elements are fully automated.

To optimize the roll change in the finishing train, it is provided that the rolling fittings can be inserted into the mounting frame and that the corresponding rolling rings can be fixed in the operating position. This results in an even more complete pre-assembly on the building site, which ultimately the roller change times are also shortened and the availability of these road sections increases. Overall, the availability of the entire steel bar / wire mill is improved. In this sense, it is also expedient if, according to a further proposal of the invention, the front plate has centering and clamping pieces for fixing the mounting frame on the front plate of the compact frame. A mounting frame designed in this regard is explained in more detail in the special description below.

Figur 1

das Lay-Out der Walzstraße,

Figur 2

die Fertigwalzstraße im Falle des Trennwalzens mit zwei Horizontal-Duo-Gerüsten,

Figur 3

die Fertigwalzstraße im Falle des Trennwalzens mit zwei Vertikal-Horizontal-Walzblöcken,

Figur 4

die Walzenwechselvorrichtung für die Vorstraße,

Figur 5

die Walzenwechselvorrichtung für die Zwischenstraße,

Figur 6

die Walzenwechselvorrichtung für die Fertigstraße,

Figur 7

den Montagerahmen für die Walzenwechselvorrichtung nach Fig. 6.

The invention is described with reference to schematic drawings for a high-performance steel bar / wire mill. Show it:

Figure 1

the layout of the rolling mill,

Figure 2

the finishing mill in the case of separating rolling with two horizontal duo stands,

Figure 3

the finishing mill in the case of separating rolling with two vertical-horizontal blocks,

Figure 4

the roll changing device for the roughing train,

Figure 5

the roller changing device for the intermediate line,

Figure 6

the roll changing device for the finishing train,

Figure 7

the mounting frame for the roller changing device according to FIG. 6.

In Fig. 1, the high-performance steel bar / rolling mill is shown with the roughing train 1, which consists of roll stands arranged side by side in the rolling line with the stand sequence horizontal (H) / vertical (V), followed by the intermediate train 2, which also consists of side by side Roll stands with the horizontal (H) / vertical (V) stand sequence, which is followed by finishing train 3. The finishing train 3, which is the intermediate line in the wire production, is followed by the finishing block 4 with the cooling device (not shown in more detail), usually consisting of a water cooling section with a driver / winding layer and the Stelmor system. In the case of rolling rod production, the finishing train 3 is followed by a cooling or storage bed 6.

2 and 3 show in an enlarged detail the finishing train 3, in which three rolling stands with the stand sequence horizontal / vertical / horizontal are followed by a rolling block 7, which consists of two rolling units in the sequence vertical / horizontal. According to FIG. 2, two horizontal duo stands 8 are arranged downstream of the vertical / horizontal rolling block 7. The rollers 9 of these duo stands each have at least two calibers 10, 11. It can be clearly seen that in the horizontal roller unit 7 ″ of the rolling block 7, the rolling stock 12 is separated from a single rolling strand onto two rolling strands 12 ′, 12 ″ and each of these rolling strands in the two subsequent horizontal stands 8 one Oval / round rolling is subjected. It should be noted that in the case of separating rolling, the vertical rolling unit 7 'of the roll block 7 runs along empty or that the corresponding roll cassette is removed. 3 shows that in the case of separating rolling of the rolling stock 12 with the help of the horizontal rolling unit 7 ″ of the rolling block 7, two two-stand rolling blocks 13, 14 are arranged downstream, specifically for each rolling strand 12 ′ or 12 ″. one roll each block 13 and 14. Each rolling block 13, 14 has two rolling units 13 ', 13''; 14 ', 14''in the vertical / horizontal roller sequence.

The tilting or rotating stands usually used at this point are replaced by the vertical / horizontal rolling block 7 in the finishing train 3. The horizontal duo stands shown in FIG. 2 are replaced by the vertical / horizontal rolling blocks 13, 14.

All of the rolling stands in the rolling mill, in particular according to FIG. 1 in connection with FIG. 3, have overhung shafts on which the rolling rings are mounted. This opens up the possibility of changing the rolls in accordance with the minimized caliber series in each section of the road, namely in the roughing train using crane tools (Fig. 4), in the intermediate train using manipulators (Fig. 5) and in the finishing train using quick-change devices (Fig. 6) .

According to FIG. 4, the crane tools 15 for changing the rolling rings 18, in particular the horizontal stands (FIG. 4) in the roughing street 1, consist of a C-shaped carrier tool 19 which is pivotably suspended on a crane bridge 20. In the lower center of gravity of the carrier tool, a handwheel-operated roll changing device 21 is arranged, which receives the corresponding rolling rings 18 of the roll stand together. For this purpose, a lever system 22 is provided with an end projection 23 which engages in the caliber 24 of the roller rings 18 when the handwheel is rotated and the guide nut 25 is thus moved longitudinally. The roller changing device 21 'for the roller rings of the vertical stands can, for example, be of the usual design Ropes of a crane are raised (Fig. 4b). In the simplest version it is also possible that the crane cables can be attached directly to the roller rings (Fig. 4c).

FIG. 5 shows the use of a manipulator 16 for changing the rolling rings 31, 32 of a vertical compact stand 33 (FIG. 5a) or a horizontal compact stand 34 (FIG. 5b) in the intermediate street 2. The manipulator 16 is on a carrier bridge 26 attached, and connectable to a hydraulic system, not shown. The manipulator usually consists of joint systems 27, 28, so that the head 29 of the manipulator, which carries the changing device 35 for the roller rings 31, 32, can be moved on all sides. The head 29 of the manipulator 16 can be controlled by the operating personnel in any direction of movement with the aid of a control lever 30, so that the rolling rings 31, 32 are pulled off the respective rolling stand in the shortest possible time and can be exchanged for new rolling rings 31 'or 32', respectively store the site 36 prepared.

A quick-change device 17, which is shown in FIG. 6, is provided for changing the rolling rings 46 in the finishing train 3. The quick-change device 17 consists of an interchangeable carriage 37 which can be moved by a piston-cylinder linkage 38 on a conventional rail arrangement between the roll stands 42, 43 and a construction site 39. The changing device has a lifting and rotating receiving device 40, the movement of which is indicated by arrows and which, according to FIG. 6a, has two diametrically opposite roller carriers 44, each with a receiving opening 41 at least for the corresponding rolling rings 46 of the vertical compact stand 42 Receiving opening can thus carry the finished rolling rings of the roll stand 42 while the other receiving opening accommodates the new rolling rings prepared on site 39. The receiving device 40 for the rolling rings of the horizontal compact stand 43 is designed somewhat differently according to FIG. 6b, in that the two opposite roller carriers 44 on the interchangeable carriage can be moved so far according to the movement arrow that there is sufficient space for mounting or removing the rolling rings if the receiving device 40 is rotated accordingly on the change carriage.

A particularly advantageous mounting system is shown in FIG. 7, namely a mounting frame 45 which can be inserted into the receiving openings 41 of the quick-change device 17 in FIG. 6. The corresponding rolling rings 46, 46 'are fixed in the mounting position 45 in the installation position and thus in the operating position. In addition, the rolling fittings 47, 47 'of the inlet and outlet sides are firmly inserted in the mounting frame. The rolling rings are fixed in the installation position with the aid of a conventional and therefore not shown lever system, the mounting hooks 48, 48 'of which are placed on the circumference of each rolling ring or on the caliber of the rolling ring for secure positioning. Centering pieces 49 and clamping devices 50 are provided on the front plate 52. These measures serve to center and fix the assembly frame on the front plate of the respective compact stand of the finishing train 3. With the help of the assembly frame 45 according to FIG. 7, the quick-change device shown in FIG. 6 can be used even more effectively for the rolling rings.

It could be shown that the measures claimed increased the availability of a bar and wire rod mill with high output and excellent product quality, if primarily in all streets cut roll stands or rolling units with overhung shafts and removable roll rings are used and if the design of the roll changing devices are precisely matched to the need and frequency of the roll changing conditions.

List of reference numbers

1

 Vorstrasse

2nd

 Intermediate street

3rd

 Finishing train

4th

 Finished block

5

 Cooling line

6

 Cooling / storage bed

7

 Rolling block

7 '

 Vertical rolling unit

7 ''

 Horizontal rolling unit

8th

 Horizontal duo scaffold

9

 Rollers

10th

 Oval caliber

11

 Round caliber

12

 Rolling stock

12 '

 Rolled stock

12 ''

 Rolled stock

13

 Rolling block

13 '

 Vertical rolling unit

13 ''

 Horizontal rolling unit

14

 Rolling block

14 '

 Vertical rolling unit

14 ''

 Horizontal rolling unit

15

 Crane tool

16

 manipulator

17th

 Quick change device

18th

Rolling ring

19th

 Carrier tool

20th

 Crane bridge

21

 Exchange device

21 '

 Exchange device

22

 Lever system

23

 head Start

24th

 caliber

25th

 Guide nut

26

 Girder bridge

27, 28

 Joint system

29

 Manipulator head

30th

 Control lever

31, 32

 Roll rings

33

 Vertical compact frame

34

 Horizontal compact scaffold

35

 Roller changing device

36

 Building site

37

 Exchange car

38

 Piston-cylinder linkage

39

 Building site

40

 Reception facility

41

 Receiving opening

42

 Vertical compact frame

43

 Horizontal compact scaffold

44

 Roller carrier

45

 Mounting frame

46, 46 '

 Roll rings

47, 47 '

 Roll fittings

48

 Assembly hook

49

 Centering pieces

50

 Clamping device

51

 Axis of rotation

52

 Front panel

Claims (10)

High-performance steel bar / wire mill, in particular for single-core, twist-free rolling of rolled material, each with a plurality of roll stands or rolling units comprising a roughing mill, at least one intermediate mill and a subsequent finishing mill with a subsequent finishing block, if applicable,
characterized,
that in accordance with the minimized caliber series in each section of the road, the roller change in the roughing train (1) using a crane tool (15), in the intermediate line (2) using a manipulator (16) and in the finishing train (3) using a quick-change device (17), if necessary, additionally Manipulator (16) is carried out, with all the roll stands or rolling units in the individual road sections (1 to 4) having abradable rollers (18, 31, 32, 46) mounted on the fly. Rolling mill according to claim 1,
characterized,
that for the purpose of swirl-free rolling of the rolling stock (12) roughing and intermediate mill (1, 2) in alternating order have horizontal and vertical compact stands (H, V) that the finishing mill (3) seen in the rolling direction initially from horizontal and There are vertical compact stands (HV), followed by a rolling block (7) having a vertical and horizontal rolling unit (VH), the horizontal rolling unit (H) of which is used exclusively for separating the rolling stock (12) into two separate rolling cores (12 ', 12 '') can be used, during which the vertical rolling unit (V) can be used for normal rolling of the rolling stock (12), and that the finishing block (4) consists of several horizontal and vertical rolling units (HV) in a 45 ° arrangement of the rolling rings (46), which are attached to a base frame. Rolling mill according to claims 1 and 2,
characterized,
that the vertical-horizontal rolling block (7) in the finishing train (3) for the last passages of the separating roll two duo-roll stands (8) with the rolling sequence from the oval caliber to the round caliber are arranged. Rolling mill according to claims 1 and 2,
characterized,
that the vertical-horizontal rolling block (7) of the finishing train (3) for the last pass of the separating roll is followed by two vertical and one horizontal rolling unit (VH) having compact rolling block (14). Rolling mill according to claims 1 to 4,
characterized,
that in the roughing area (1) a C-shaped angled to a crane bridge (20) pivotally mounted carrier tool (19) can be used, on the lower center of gravity a common changing device (21) for the roller rings (18) is arranged at least the horizontal compact stands . Rolling mill according to claims 1 to 5,
characterized,
that a manipulator (16) which can be moved on all sides is arranged in the intermediate line (2), the head (29) of which carries the changing device (35) for the roller rings (31, 32) of the compact stands (33, 34) and which can be controlled manually. Rolling mill according to claims 1 to 6,
characterized,
that in the finishing train (3) a lifting and rotating, if necessary, slidably designed and arranged on a movable changing carriage (37) arranged changing device (17) for the two corresponding rolling rings (46) of each vertical and horizontal stand (42, 43) can be used is. Rolling mill according to claims 1 to 7,
characterized,
that the roller changing device (17) has at least two receiving devices (40) which can be pivoted about its axis of rotation (51) for an assembly frame (45) which receives at least the roller rings. Rolling mill according to claims 1 to 8,
characterized,
that the rolling fittings (47) can be inserted into the mounting frame (45) and the corresponding rolling rings (46, 46 ') can be fixed in the operating position. Rolling mill according to claims 1 to 9,
characterized,
that the front plate (52) has centering and clamping pieces (49, 50) for fixing the mounting frame (45) on the front plate (52) of the compact frame (42, 43).

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