EP0329998B1 - Rolling train, especially one in a section-rolling mill - Google Patents

Abstract

In order to mechanise and automate to a large extent the changing of rolls and fittings in a roll-stand group (4) of a rolling train, in particular a rolling train in a section-rolling mill, it is proposed that preferably each second roll stand (1) of each roll-stand group (4) consisting of a plurality of roll stands (1, 2, 3) be designed to be displaceable, movable or transferable by at least the width of the guide fitting (10) out of the rolling line (16) in order to make access to the guide fittings, arranged at a short distance from one another in the rolling line, easier for exchange and also to enable the sets of rolls of the individual roll stands to be exchanged more rapidly. <IMAGE>

Description

The invention relates to a rolling mill in a shaped steel rolling mill with at least one stand group consisting of n stands in a group, the stand having at least horizontal guide fittings, which are arranged at least on the middle stands in a rolling line with a close spacing; see DE-A 33 17 748. According to claim 12, the invention also relates to a method for controlling the stand change in said rolling mill.

The overall technical concept for the economic efficiency of the rolling mill is decisive for the rational production of steel profiles of different shapes and sizes in combined shaped steel rolling mills, in particular largely mechanized change systems for the roll stand, rolls and roll stand fittings are decisive for cost-effective adaptation of the rolling mill to different rolling programs with different lot sizes .

In order to create the prerequisites for maximum possible times of use for a rolling mill, it has already been proposed to move complete rolling stands over sliding platforms with the help of quick-release couplings from the rolling mill to separate building sites and to replace them with rolling stands adapted to the respective rolling program, which have been prepared on the site and be driven over the transfer platforms into the rolling mill. The use of interchangeable stands also allows rolling systems to follow one another as required. These measures make it possible to switch from one universal program to another or from universal rolling mill to duo rolling mill or vice versa. The time required for a quick program change could be reduced considerably. The disadvantage of the interchangeable stands is the high investment costs and the need to have a large number of susceptible media and electrical couplings.

From EP-PS 2047 it is also known to move heavy roll stands quickly and with little structural effort over long travels when changing stands, for which purpose the roll stand has its own drive, which is geared to rollers on which the stand directly along traverse paths the rolling line or from this is movable.

In order to adapt the roll stands to different rolling programs, it is also known to move complete roll sets out of the roll stands, which are stationary in a rolling train, across the rolling path. For this purpose, the fittings guiding the rolling stock are dismantled. This is done with the help of the hall or auxiliary cranes. However, the disassembly, assembly and that Aligning the fittings takes a lot of time and personnel. Not least because access to the fittings is very difficult due to the limited space available.

The object of the present invention is to be able to adapt a rolling mill of the type mentioned at the outset to the various rolling programs even more efficiently, primarily by means of extensive mechanization of the roll change and change of fittings on the roll stand, in order to reduce the time and manpower required for the staff when changing the roll To reduce the risk potential and to do without interchangeable scaffolding.

This object is achieved on a rolling mill according to the preamble of claim 1 by its characterizing features. The adjacent roll stands can be arranged in a stationary manner in the rolling line. For example, from a stand group consisting of three rolling stands, the middle stand is shifted to the operating side so that enough assembly space is created to remove the guide fittings from the rolling stands or to mount new guide fittings on the rolling stands. It is expedient that, in the case of a reversing tandem scaffolding group consisting of a universal scaffold, upsetting scaffold and universal scaffolding, the upsetting scaffold is designed to be displaceable by at least half the width of the universal scaffolding on the operating side. So here the smallest scaffold, the compression scaffold from a scaffold group with two heavy universal scaffolds, is also only moved to the operating side as far as the limited space between the two heavy duty universal scaffolds make this necessary. As soon as the compression frame has reached a sliding position that is outside the half width of the universal frame, the compression frame is easily accessible from all sides and the guide fittings can be changed quickly and easily. By moving the upsetting stand out of the rolling line, a space is created between the universal stands, in which assembly and disassembly devices can be used in such a way that the guide fittings of the universal stands can be replaced quickly and inexpensively.

In an advantageous embodiment of the invention, it is provided that the compression frame can be moved from the rolling line to the operating side on rollers having its own drive. In this way, the displacement path of the roll stand can be traversed quickly without the need for special displacement rods or displacement hydraulics. It is expedient that the chocks of the roll stands, which support the horizontal rolls, can be displaced from the compression stand or from the universal stand on rollers having their own drive. As soon as the guide fittings have been removed from the roll stand, the rolls stored in the chocks can be moved from the roll stands to a separate construction site without great expenditure on equipment. To set up a new rolling program, new rolls can be inserted and set in the roll stands just as quickly and easily. In the mutually offset assembly position of the roll stands, new or adapted guide fittings can be mounted quickly and easily. It becomes clear that through these measures, the assembly effort is reduced considerably and that expensive interchangeable scaffolding can be dispensed with.

To further mechanize the change of fittings in a group of scaffolds, it is proposed that the compression scaffold have at least one movable assembly platform on the drive side. It is expedient that the assembly platform in the rolling line has a platform length which corresponds approximately to the distance between the universal stands and that the platform width corresponds approximately to the displacement path of the compression frame. This measure allows the guide fittings to be pulled off the two universal stands from an assembly platform, since the assembly platform is inserted between the universal stands to the extent that the compression stand is moved out of the rolling line. The assembly of the new guide fittings on the universal scaffolding is also carried out in a particularly favorable manner from the assembly platform. Furthermore, it is expedient that a stationary work platform is arranged on both sides of the displaced upsetting frame on the operating side, so that the removal of the guide fittings from the upsetting frame and the equipping of the upsetting frame with new fittings can take place in a particularly favorable manner, at the same time, for which the fittings are changed on the universal scaffolding.

In a particularly advantageous embodiment of the invention it is provided that the assembly platform and the working platform have at least one set-up group, consisting of at least one guide fitting pre-assembled in a stand and a preferably adjacent empty stand. This measure shortens the time to change the fittings again, especially if the guide fittings are pre-assembled on the assembly platform. Without hall or auxiliary cranes, the guide armatures on the assembly or working platform can be dismantled with the help of the empty stand and immediately afterwards the pre-assembled guide armature can be inserted into the rolling stand, the empty stand being designed, for example, as a movable carriage.

A further rationalization of the change of fittings in a group of rolling stands is achieved in that, on the assembly platform and on the work platform, preferably automatically operable pulling devices or assembly devices for the guide fittings are arranged, so that the use of personnel in the safety-sensitive zones can be very considerably restricted .

For a special development of the invention, it is proposed that the upsetting stand be connected to at least one position transmitter which limits the displacement path in such a way that the empty stand on the assembly platform is the guide fittings of the universal stand and that the empty stand on the working platform can be fed to the guide fittings of the upsetting stand approximately in the middle. This enables extensive automation of the scaffolding change or the change of fittings, because the automatic program control can be used to initiate the shifting of the upsetting stand from the rolling line and the position transmitter ends exactly where the dismantling of the guide fittings on the work platform or assembly platform is carried out using the automatically working puller is to take place. For the same reasons, it is expedient that the compression frame with at least a position encoder that limits the displacement path is connected in such a way that the guide fitting preassembled on the assembly platform can be fed to the universal stand in the rolling line and the guide fitting preassembled on the work platform to the compression stand approximately in the middle.

The method for controlling the stand change in a rolling mill is characterized according to the invention in that the upsetting stand is moved step by step from the rolling line and that first the position transmitter is actuated for the empty stand position for the purpose of dismantling the guide fittings from the roll stands and then the position transmitter is actuated for the pre-assembly position for the purpose of assembling the pre-assembled guide fittings on the roll stands before the upsetting stand is moved back into the rolling line. By means of a suitable program control and with the aid of the position transmitter, which can be designed as a limit switch or as a contact-free contact transmitter, the valve exchange can be largely automated in a scaffold group, for example in a universal carrier line, so that the time required for changing the guide valve in the scaffolding from typically one hour to about ten minutes.

In a further embodiment of the control method it is proposed that the position transmitter for the empty stand position releases the lock for the rollers of the roll stands stored in the chocks and the position transmitter for the preassembly position closes the lock. In this way, a fully automatic changing system for the rollers and for the guide fittings in a stand group is created, in particular in connection with driven chocks, whose hydraulic drives, for example, are switched on or stopped depending on the locking of the chocks in the roll stands.

Figur 1

eine Walzgerüstgruppe einer Universal-Trägerstraße mit in Walzlinie angeordnetem Universalgerüst, mittlerem verschobenen Stauchgerüst und nachfolgendem Universalgerüst, mit ein- bzw. aus gefahrenen Führungsarmaturen, teilweise im Schnitt,

Figur 2

eine Draufsicht auf die Walzgerüstgruppe gemäß Fig. 1 mit Montagebühne und Arbeitsbühne für den Armaturenwechsel und mit Verschiebebühnen für die Gerüstwalzen, in verkleinerter Darstellung, und

Figur 3

einen Schnitt durch das verschobene Stauchgerüst entlang der Linie III-III in Fig. 2 mit einer Ansicht auf die aus den Universalgerüsten gefahrenen Walzen.

The invention is explained in more detail using an exemplary embodiment. Show it:

Figure 1

a roll stand group of a universal carrier train with a universal stand arranged in the rolling line, a middle displaced compression stand and subsequent universal stand, with guide fittings moved in and out, partly in section,

Figure 2

a plan view of the rolling mill group according to FIG. 1 with a mounting platform and working platform for the change of fittings and with moving platforms for the scaffolding rollers, in a reduced view, and

Figure 3

a section through the displaced upsetting stand along the line III-III in Fig. 2 with a view of the rollers driven out of the universal stands.

1 shows a stand group 4 consisting of a compression stand 1 and two universal stands 2, 3, which is arranged in a shaped steel rolling mill 5. The smaller compression frame 1 is arranged between the larger universal frames 2, 3. A roller conveyor 6 which transports the rolling stock, for example a T-shaped support, is arranged on both sides of the universal stands 2, 3.

In the respective roll stands 7 of the stand group 4, the horizontal rolls 9 are stored in chocks 8. In the area of the roll gap between the horizontal rolls, the guide fittings 10 guiding the rolling stock are arranged. The chocks 8 supporting the horizontal rollers are mounted on rollers 11 which have their own drive, the drive e.g. can be a commercially available hydraulic wheel hub drive. The upsetting frame 1 and the universal frames 2, 3 are of the same type with regard to these components, which is why the same reference numbers should apply to these components.

The compression frame 1 is mounted on support rollers 12, which have their own drive. Like the roller drive on the chocks 8, this roller drive can consist of a commercially available hydraulic wheel hub drive. The upsetting frame 1 and the universal frames 2, 3 are arranged on sole plates 13, which in turn are connected to the foundation 14. The rolling stands within the stand group 4 are at such a short distance from one another that their guide fittings seem to touch in the rolling line in order to give the rolling stock an uninterrupted guidance. On the universal scaffold 3, the guide fittings 10 can be seen disassembled from the puller 15.

Fig. 2 shows a plan view of the scaffold group 4 consisting of universal scaffold 2, compression frame 1 and universal scaffold 3 in a reduced view. It can also be seen here that the guide fittings 10, seen in the rolling line 16, are at a very close distance from one another. The compression frame 1 has on the drive side 17 a mounting platform 18 which can preferably be moved together with the frame. In the rolling line 16, the assembly platform has a length L which corresponds approximately to the distance between the universal scaffolding 2, 3. The width B of the assembly platform corresponds approximately to the displacement path of the compression frame. The universal stands 2, 3 of the stand group 4 are arranged in a stationary manner in the rolling mill 5, while the upsetting stand 1 can be moved out of the rolling line 16 to the operating side 19. The shifted position of the compression frame is shown in Fig. 2 in dashed lines. It can be seen that the compression frame is displaced from the roller line by about half the width U of the universal frame 2. A work platform 18 'is located on both sides of the displaced compression frame 1'.

On the assembly platform 18, a respective set-up group 20 for the guide fittings 10 of the universal stands 2, 3 is installed opposite the respective universal stands 2, 3. The set-up group 20 for the assembly and disassembly of the guide fittings 10 and their supports 10 'consists of an empty stand 21 for a guide fitting (dashed lines) and a guide fitting 22 pre-assembled in a stand. On the work platform 18', a set-up group 23 is arranged, which contains a guide fitting 24 pre-assembled in a frame for the upsetting frame 1 and a corresponding secondary frame 25. Following the work platform 18 ', a site 26 is set up, on which the roller sets 27, 28 for the universal stands 2, 3 and the roller set 29 for the compression stand 1 are pre-equipped. The roller sets 27, 28, 29 of the stand group are displaced from the roll stands on a sliding platform provided with rails 30 to the construction site 26 or transported from the construction site 26 to the roll stands. The relocation of the roller sets takes place with the help of own roller drives 11.

If the compression stand 1 is now moved from the rolling line 16 to the operating side 19 by means of the position transmitter 31 by half the width U of the universal stand 2 into the position shown in dashed lines in FIG. 2, then the empty stands 21 stand on the assembly platform 18 in the longitudinal direction to the guide fittings 11 the universal stands 2, 3 and the empty stand 25 on the work platform 18 'stands in the longitudinal direction to the guide fittings 10 of the upsetting frame 1. With the aid of the preferably automatically operated pulling devices 15, the guide fittings from the universal stands and, at the same time, the guide fittings from this displaced position of the upsetting frame the compression frame are removed and placed on the assembly platform 18 or on the work platform 18 '. The shifted assembly position of the compression frame 1 is shown in Fig. 3. From the pullers 15 or assembly devices 15, the guide fittings 10 on the work platform 18 'are dismantled or mounted on the chocks 8. The rollers 9 of the universal stands 2, 3 can be moved along the working platform with the aid of the roller drive 11.

If the roller sets 27, 28, 29 of the entire stand group 4 are to be changed, the position sensor 31 can release the locking mechanism (not shown in more detail) for the rollers of the roll stands stored in the chocks 8, so that the roller sets can be opened by means of the driven rollers 11 the rails 30 of the transfer platform can be moved to the site 26. From the building site 26, the new roller sets assigned to the respective roll stands are moved into the roll stands on the rails 30 of the transfer platform and adjusted there in a known manner. Subsequently, the upsetting frame is moved with the aid of the idler roller drive 12 into a new assembly position which is controlled by the position transmitter 32 so that the guide fitting 22 pre-assembled on the assembly platform 18 is brought approximately centrally to the universal stands 2, 3 and at the same time that on the work platform 18 'pre-assembled guide fitting 24 is approximately in the middle in front of the rollers of the upsetting stand. In this assembly position of the upsetting frame, the preassembled guide fittings 22, 24 are connected to the upsetting frame 1 or to the universal stands 2, 3 with the aid of the automatically operated assembly devices 15. At the same time, the respective locking of the roller sets in the roll stands can be controlled by the position transmitter 32. Then the upsetting stand 1 is moved from the operating side 19 back into the rolling line 16, so that the entire stand group is set up to roll a rolled product with a changed profile shape. With the measures described above for the extensive mechanization and automation of the roll and valve change in a stand group in a shaped steel rolling mill, it is possible to reduce the time and manpower required for the disassembly, assembly and alignment of the valves and for the roll change to reduce the individual scaffolding to a fraction of the previously known effort.

List of reference numbers

1

Compression frame

2nd

Universal scaffold

3rd

Universal scaffold

4th

Scaffolding group

5

Rolling mill

6

Roller table

7

Mill stand

8th

Chock

9

Horizontal rolling

10th

Guide fitting

10 ′

Carrier of the guide armature

11

Roller drive

12th

Idler roller drive

13

Sole plate

14

foundation

15

Puller or assembly device

16

Rolling line

17th

Drive side

18th

Assembly platform

18 ′

Working platform

19th

Operator side

20th

Setup group

21

Empty scaffolding for universal scaffolding

22

Pre-assembled guide fitting for universal scaffolding

23

Setup group

24th

Preassembled guide fitting for compression frame

25th

Empty frame for upsetting frame

26

Building site

27

Roller set for universal scaffolding

28

Roller set for universal scaffolding

29

Roller set for upsetting stand

30th

Rail of the transfer platform

31

Position transmitter

32

Position transmitter

Claims (13)

1. Rolling train in a steel section rolling mill, comprising at least one stand group (4) consisting of n stands in a group, wherein the rolling stands have at least horizontal guide fittings (10), which are arranged at least at the middle stands in a rolling line with narrow spacing relative to one another, characterised thereby that the rolling train is a reversible tandem stand group (4), which consists of a first universal stand (2), an edging stand (1) and a second universal stand (3), and that out of the reversing tandem stand group (4) the edging stand (1) is constructed to be slidable, transportable or offsettable by at least the width of the guide fitting (10) out of the rolling line (16) for the purpose of exchange of the guide fittings (10) and/or the rolls (9), wherein the edging stand (1) has at least one transportable mounting platform (18) on the drive side (17) and wherein a stationary work platform (18') is arranged at both sides of the displaced edging stand (1) on the service side (19).
2. Rolling train according to claim 1, characterised thereby that the edging stand (1) is constructed to be displaceable by at least half the width (U) of the universal stand (2, 3) to the service side (19).
3. Rolling train according to claim 1 or 2, characterised thereby that the edging stand (1) is displaceable out of the rolling line (16) to the service side (19) on rollers (12) having an own drive.
4. Rolling train according to at least one of claims 1 to 3, characterised thereby that the chocks (8), which carry the horizontal rolls (9), of the rolling stand (3) are shiftable out of the edging stand (1) or out of the universal stands (2, 3) on rollers (11) having an own drive.
5. Rolling train according to at least one of claims 1 to 4, characterised thereby that the mounting platform (18) has in rolling line (16) a platform length (L) which corresponds approximately to the spacing between the universal stands (2, 3) and that the platform width (B) corresponds approximately to the displacement travel of the edging stand (1).
6. Rolling train according to at least one of claims 1 to 5, characterised thereby that the mounting platform (18) and the work platform (18') have at least one assembly group (20, 23), consisting of at least one guide fitting (22, 24) premounted in a stand and an empty stand (21, 25) preferably arranged adjacently.
7. Rolling train according to at least one of claims 1 to 6, characterised thereby that the assembly group (20) on the mounting platform (18) contains the premounted guide fitting (22) for the universal stand (2, 3) and the assembly group (23) on the work platform (18') contains the premounted guide fitting (24) for the edging stand (1).
8. Rolling train according to at least one of the preceding claims, characterised thereby that removal or mounting devices (15), which are preferably automatically operable, for the guide fittings (10, 22, 24) are arranged on the mounting platform (18) and on the work platform (18').
9. Rolling train according to at least one of the preceding claims, characterised thereby that the edging stand (1) so stands in connection with at least one position transmitter (31) limiting the displacement travel that the empty stand (21) on the mounting platform (18) can be brought approximately centrally to the guide fittings (10) of the universal stand (2, 3) and the empty stand (25) on the work platform (18') can be brought approximately centrally to the guide fittings (10) of the edging stand (1).
10. Rolling train according to at least one of the preceding claims, characterised thereby that the edging stand (1) so stands in connection with at least one position transmitter (32) limiting the displacement travel that the guide fitting (22) premounted on the mounting platform (18) can be brought approximately centrally to universal stand (2, 3) in the rolling line and the guide fitting (24) premounted on the work platform (18') can be brought approximately centrally to the edging stand (1).
11. Rolling train according to at least one of the preceding claims, characterised thereby that the position transmitter (31, 32) stands in connection with the locking mechanism for the rolls (9), which are mounted in the chocks (8), of the roll stand.
12. Method of controlling stand changeover in a rolling train according to at least one of claims 1 to 11, particularly according to claims 9 and 10, characterised thereby, that the edging stand (1) is movable in steps out of the rolling line (16) and that initially the position transmitter (31) is driven for the empty stand setting for the purpose of demounting of the guide fittings (10) from the roll stands and subsequently the position transmitter (32) is driven for the premounting setting for the purpose of mounting of the premounted guide fittings (22, 24) at the roll stands before the edging stand (1) is moved back into the rolling line (16).
13. Method according to claim 12, characterised thereby that the position transmitter (31) for the empty stand setting releases the locking mechanism for the rolls (9), which are mounted in the chocks (8), of the roll stands and the position transmitter (32) for the premounting setting closes the locking mechanism.

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