DE2613459A1 - Arrangement for avoiding scrap in a rolling mill - for wide strip material, during break down of the prodn. line and/or the strip winding arrangement - Google Patents

Abstract

The raw material first passes through a row of pre-rolling mills. The pre-rolled strip is wound on rollers after which the rolls are placed by a transporter in an oven. The oven forms a store for several rolls of pre-rolled material and keeps these at rolling temp. during any break down of the finishing plant. The transporter is so arranged, that the rolls are turned over in a horizontal plane by 180 degrees. This ensures that the rolls leave the oven with the correct end facing the finishing plant. When the break down is repaired, the transporter removes the rolls from the oven and places them in the winding machine which in this case unwinds the rolls and feeds the material to the finishing plant.

Description

Process and system to avoid the accumulation of scrap

in continuous broadband lines The invention relates to a method to avoid the accumulation of scrap in continuous broadband lines in the event of disruptions in the finishing train and / or on the coiler system as well as a system for implementation of the procedure.

When operating continuous high-performance broadband lines It can happen that oi malfunctions in the finishing train or on the downstream train Reel system occur. In such a case there are already three to four slabs outside the furnace, that is, in the one between the furnace and the Finishing mill lying working area of the broadband mill.

The malfunctions occurring in the finishing train or at the; aspelanlaOe however, do not allow these slabs to be rolled out into the finished product. Much more it is necessary to keep the association emerging from the roughing train entering the To prevent finishing mill. One has therefore hitherto in the occurrence of disorders in the Finishing mill or the bandage on the reeling system when it comes out of the last one The framework of the roughing train is pulled off sideways, cut into scrap lengths and removed. The material removed in this way was either scrapped or as a Second grade material sold for specific, minor uses.

Since the weight of a single slab can be up to 45 t it is clear that if faults occur in the finishing train or on the coiler more than 100 tons of rolled material become unusable or sold as poor quality will have to.

Purpose of the invention is this, when operating continuous Avoid the disadvantage resulting from high-speed broadband roads. It is therefore the The object of the invention, a method and a system for avoiding the occurrence of scraps to create in continuous broadband roads through which or with which the full length of all pre-strips exiting the roughing train are retained and after the malfunctions have been eliminated for further processing of the Finishing train can be fed back.

The solution to this problem is, according to the invention, in process engineering Respect achieved by the fact that the sliver is bundled when it leaves the roughing train rolled up, then stored and kept on rolling heat and finally is fed to the finishing train while being unwound from the bundle.

As when faults occur in the finishing train or in the coiler system it is no longer rolled in the roughing train as soon as those outside the furnace Rolling slabs have completely passed through the roughing train when the method according to the invention type immediately after eliminating the disturbances already several, Rolling rods having pre-strips are available, so that the rolling operation in the finishing train can be resumed without a salt slab running through the roughing train beforehand must have.

According to the invention, it has proven to be useful if the band collar before inserting the stored on it Pre-strip in the finishing mill is turned around 1800, because the end of the tape is in the same plane and the same Winding direction can be forwarded as it has previously been wound.

Hit advantage is that the band is turned before it is kept warm, see above that the sliver is fed back into the finishing train with rolling heat without delay can be.

The process technology on which the invention is based sees this before that the band collar is moved to keep warm and / or turning out of the rolling line.

Because the pre-strip leaves the last stand of the roughing train still has a considerable thickness, the smearing process is favored if after the pre-strip is pre-bent before winding up a further invention, On the other hand, it also makes sense to unwind the opening act from the bundle again to be straightened before it enters the finishing mill.

From the DU-OS 2 256 0L-4 and the DT-OS 2 256 030 it is known Winding up the pre-strip leaving the roughing train of a rolling mill into bundles and then pull it off immediately afterwards links from the bundle and put into the finishing mill to introduce. However, this known type of method cannot serve the purpose that in the event of malfunctions in the finishing train or in the coiler system to store the slabs in the roughing mill in the form of rolled roughing strips, until the faults are resolved.

Rather, its only purpose is to achieve that the direction of passage of the rolling stock in the finishing train opposite the direction of flow in the roughing train is reversed.

In other words, the end of the rolled strip trailing in the roughing train should enter the finishing train as the head end, around the when passing through the roughing train Temperature drop that has occurred between the head section and the trailing end of the opening act balance.

A plant for carrying out the method according to the invention is essentially characterized in that in the ItTalzlinie between roughing train and finishing train, a winding machine for winding and unwinding is arranged, that outside the rolling line, next to the winding machine, there is a heating furnace is located, and that a coil transport device between ir winding machine and the heating furnace is reciprocable.

A further feature of the invention is the winding machine A strip pre-bending device on the roughing road side and a strip pre-bending device on the J? ertigstraße side a strip straightening machine assigned to facilitate the winding operation on the one hand and on the other hand to ensure the safe entry of the pre-strip into the finishing train.

It has also been proposed that the plant be constructed so as to contain the heating furnace forms a store for several strip bundles.

So that the system operates in an optimal manner in terms of heat economy can be is, according to another feature of the invention, the heating furnace on the loading and A temperature lock is connected upstream on the unloading side.

According to the invention, the bundle transport device can consist of a bundle carriage exist, which can be moved below the winding machine and the heating furnace and has a liftable and lowerable turntable for the band bundles, which is placed in the heating furnace can be raised.

Finally, the system according to the invention is constructed so that the Turntable of the Bunäwagen in a space between the wrapping machine and the heating oven is rotatable about a vertical axis by 180 °.

Of course, the system according to the invention can also run so that the turntable of the bundle car can be saved, namely in that the inlet for the pre-strip to be wound up in the winding machine is on a different level than the outlet for the tape to be unwound from the winding machine, But while using a turntable, the winding machine for winding of the sliver can be operated with the same direction of rotation as for unwinding of the pre-strip, it would be necessary to save the turntable, the winding machine for winding up the pre-tape and for unwinding the pre-tape each with operate in opposite directions of rotation.

When rolling out various steels, especially those steels, which are used for pipe production, it is for metallurgical reasons it is desirable to roll the material in the roughing train at a higher temperature than in the finishing mill. On the face of it, this condition seems easy to be fulfilled by simply removing the strip exiting the roughing line before entering in the finishing train to the lower temperature for rolling in the finishing train lets cool down.

In practice, however, this results in considerable difficulties which lead to a lasting disruption of the continuous rolling operation.

A further object of the invention is therefore to provide a method and to develop a system for temperature locking of sliver that or the targeted temperature control without significantly lengthening the entire broadband line the entire length of the sliver while maintaining a practically continuous Rolling operation of roughing train and finishing train enabled.

Based on the type of procedure in which the pre-strip on expiry from the voxstrare, wound 8 bundles, then heat treated and subsequently is unwound again from the coils for the entry into the finishing train, results The solution to this problem is essentially that the band bundles initially subjected to a temperature reduction below the rolling temperature of the finishing train and immediately afterwards heated to the exact finishing train rolling temperature will.

The facility to carry out this procedure is in the main characterized in that the heating furnace arranged outside the rolling line is at least a temperature reduction zone leading away from the roughing train and one to the finishing train Has leading temperature increase zone. It has to be particularly beneficial proved when the heating furnace contains 3 separable temperature zones, of which the first two temperature zones together form the temperature reduction zone form.

Each of the 3 temperature zones of the oven has a different characteristic the invention designed as a memory for several tape bundles and contains each its own transport device for the tape bundles.

It has also proven to be useful if the 3 temperature zones of the furnace are arranged at right angles to one another and one with the other form a substantially U-shaped heating furnace.

The invention will now be described in detail with reference to the drawing Figure 1 shows, in a schematically simplified representation, a continuieiiche High-performance broadband line with an assigned system to avoid the accumulation of scrap in an operating phase in which there are several slabs in the work area between Furnace and finishing train are located while the finishing train and / or the Coiler system gesbp tt znt1 K FIG. 2 one of FIG. 1 corresponding Representation of the continuous high-performance broadband line in one operating phase, in which the malfunction of the finishing train and / or the coiler system has been remedied, figure 3 in a detailed representation and sectional side view, the one essential Part of the system to avoid the accumulation of scrap forming pre-strip winding machine, FIG. 4 shows, in a simplified schematic representation, a continuous high-performance broadband line with an assigned system for temperature locking of the pre-strip after the run-out from the roughing train and before entering the subsequent finishing train, figure 5 shows, on a larger scale, a detailed top view representation of that shown in FIG System for temperature control of pre-strip, FIG. 6 shows a section along the lines VI - VI in Figure 5, Figure 7 shows a section along the lines VII - VII in Figure 5, FIG. 8 shows a section along the lines VIII - VIII in FIG. 5 and FIG. 9 a Section along the line IX - IX in FIG. 5.

The continuously operating high-performance broadband line 1 exists from a roughing train 2, a finishing train 3 and a strip reel 4. The ones to be rolled out Slabs 5 are fed to it from a furnace 6.

During normal rolling operation, the individual slabs 5 pass through one after the other the roughing train 2 and the finishing train 3 and thereby gradually become the wide strip the desired dimensions are rolled out. The rolled strip leaving the finishing train 3 is then wound into tape bundles with the help of the reel system 4 Stepping in operation the high-performance broadband mill 1 in the finishing mill 3 or the coiler system If there are 4 faults, there is already a large number of slabs 5 between the discharge side of the furnace 6 and the last stand of the roughing train, such as this can be seen from FIG.

Since the weight of each individual slab can be 5 to 45 t, In the event of a malfunction, there are regularly more than 100 t of rolled material outside the Furnace 6, assuming that at least three rolling slabs 5 in the machining process stand.

So that the pre-strips 7 running out of the roughing train 2 are not scrapped there is an auxiliary system between roughing train 2 and finishing train 3 8 arranged to avoid the accumulation of scrap. This consists of a winding machine 9, which initially winds the pre-strip 7 into strip bundles. There is also a bundle transport device 10 available, which the finished wound tape bundles from the winding machine 9, the the pre-strip 7 initially winds up to form tape bundles. There is also a bundle transport device 10 is available, which takes over the finished wound tape bundles from the winding machine and transported them sideways from the rolling line into a heating furnace 11.

This heating furnace. 11 forms a memory for several tape bundles and keeps this during the operational disruptions in finishing train 3 or at the coiler 4 at rolling temperature.

The Bund-iiransportvorrichtung 10 is designed so that they of The tape bundles taken over by the winding machine 9 before entering the heating furnace 11 rotates in the horizontal plane by 1800, so that the trailing from the roughing train 2 End of the sliver reaches a position in which there is the leading end for the Introducing into the finishing train 3 forms.

As soon as the malfunction occurs in finishing mill 3 or at the coiler 4 is corrected, the coil transport device 10 moves individually and one after the other from the heating furnace 11 and transfers them to the winding machine 9. This winds the Sliver 7 from the band collar and is operated in the same direction of rotation as in the previously described winding process.

The individual pre-strips 7 then pass through the finishing train 3 and are rolled out to the broadband 12. This runs to the reel system 4 and is from this wound up into individual tape bundles 13.

So that the heating furnace 11 under thermally favorable conditions can be driven, there is a temperature lock on the loading and unloading side 14 upstream, which causes excessive heat losses when moving the belt bundles in and out prevented.

From Fig. 3 of the drawing is the basic structure of the winding machine 9 and their interaction with the bundle transport device 10 can be seen. aside from that the assignment of a strip pre-bending device 15 to the The roughing train side of the winding machine 9 and a strip straightening machine 16 on the finishing train side the winding machine 9 emerges.

The winding machine 9 is a mandrelless winding machine in principle Running three-roller bending machine, in which the roller 17 on the inner circumference of the band collar as a support role is effective and against this via a pressure cylinder 18 can be employed. The roll 19 of the winding machine is part of the bundle transport device 10 and stored in a turntable 20 which is movable around a vertical axis by 1800, which is carried by a Bund transport carriage 21, which on rails 22 on the one hand can be driven under the winding machine, but also under the Heating furnace 11 is movable.

The turntable 20 can be raised and lowered in the bundle transport carriage 21 guided so that the bending roller 19 can be raised to the winder position, in which it is effective on the outer circumference of the band.

The bending roller 23 can also be used with the aid of a pressure cylinder 24 be employed against the outer circumference of the band to be wound, in such a way that that all three bending rollers 17, 19 and 23 together have the respective bending radius for determine the pre-strip 7.

While the bending rollers 17 and 1) are stored loosely, the bending roller 23 power driven.

So that the winding up of the sliver 7 takes place without disturbances, this is driven into the winding machine 9 via a driver 25. Behind the driver 25 the pre-bending device 15 is arranged, by means of which the pre-strip 7 is pre-bent is imposed, by which it is deflected from the rolling plane into the winding position will. The sliver 7 runs under a support roller 26 of the turntable 20, which together with the bending roller 19 also mounted on this finished The wound band is supported while it is from the winding machine 9 in the heating furnace 11 or in the opposite direction.

Even when unwinding the pre-strip 7 from the strip collar, this runs between the rollers 19 and 26 of the turntable 20 through, and that takes The turntable 20 is rotated by 1800 about the vertical axis compared to FIG Position. That is, in the unwinding operation, the roll 19 is at the point which has the roll 26 in the winding operation and vice versa is the roll 26 in the unwinding operation in a position which the roll 19 during the winding operation occupies.

So that the pre-strip 7 unwound from the band bundle when entering the Finishing train 3 no longer has a bend, it runs out of the winding machine 9 by the strip straightening machine 16 arranged on the finishing train side.

On the side of the line 1 opposite the furnace 11, it is also possible a grate 27 can be arranged, this grate 27 allows the on the winding machine 9 formed band bundles, if necessary for cooling and for the subsequent removal park next to the winding machine 9.

In Figure 4 is a continuous high speed broadband line 31 shown, which in turn consists of a roughing train 32, a finishing train 33 or a Tape reel 34 is made. The slabs 35 to be rolled out are removed from the furnace 36 fed.

The broadband train 31 is designed so that during normal rolling operations the individual slabs 35 pass through roughing train 32 and finishing train 33 one after the other, the rolled strip leaving the finishing train 33 with the help of the coiler 34 is wrapped into the ribbon.

When rolling out special steels, such as those used for pipe production are used, but a different sequence of the rolling process is provided. and although the pre-strips 37 running out of the roughing train 32 are initially an auxiliary system 38 for temperature control supplied, before You enter finishing train 33 to continue the rolling work.

The auxiliary system 38 for regulating the temperature of the preliminary strips 37 exists from a winding machine 39 which initially winds the sliver 37 into tape bundles. These band bundles are then taken over by a bundle transport device 40 which first of all rotates the band bundles by 1800 and then feeds them to a heating furnace 41.

This heating furnace 41 consists of three furnace sections 42, 43 and 44, each of which forms a store for several belt bundles. The furnace sections 42, 43 and 44 are each arranged at right angles to one another, so that the heating furnace 41 has a substantially U-shaped plan. Here brings the Bundle transport device 40 the band bundles coming from the winding machine 39 first in the furnace section 42, within which they gradually move onto the furnace section 43 to be moved.

In section 43 of the oven, the direction of movement of the band is around 90 deflected so that it extends parallel to the rolling direction of the broadband train 31. At the level of the furnace section 44, the direction of movement is then again deflected for the band bundles by 9o0, with the latter gradually turning towards the Rolling line to be transported. At the end of the furnace section 44, each individual Ribbon bundle again taken over by a bundle transport device 45 and transferred to a winding machine 46 pass that unwinds the sliver 37 from the band bundle and into the finishing mill 33 introduces. After passing through the finishing train 33, the rolled strip is from the Reel system 34 wound up.

Structure and mode of operation of the auxiliary system 38 and in particular of the heating furnace 41 will now be described in connection with FIGS. 5-9.

The heating furnace 41 serves the purpose of keeping the temperature of the roughing train 32 running down sliver 37 to a predetermined temperature before it is further processed in the finishing train 33. To achieve that, there is temperature in the oven section 42 is kept lower than the temperature of the on the winder 39 pre-strip 37 wound into a strip bundle. The temperature is in the furnace section 43 again lower than in the furnace section 42 and to such an extent that the Temperature of the belt bundles after which they pass through the furnace sections 42 and 43 are below the temperature at which the sliver 37 in the finishing train should be processed further. The furnace section 44 is now heated in such a way that that the band bundles fed to it from the furnace section 43 again increase in temperature experienced, in such a way that the winding machine 46 to run in the pre-strip 37 unwound in the finishing train 33 exactly the required (lower) Has rolling temperature.

So that in each case the correct one in the individual furnace sections 42, 43, 44 If the temperature level is maintained over the long term, they are opposed to one another by means of lifting gates 45 lockable (Figure 6), each between two transport steps for the band bundles are kept flowing, and only opened briefly during each transport step will. A temperature lock 46 is also assigned to each of the furnace sections 42 and 44, which is closed against the rolling line by a lifting gate 47, while against the furnace section 42 or 44 can be blocked by a further lifting gate 48.

Inside the furnace sections 42 and 44 and also in the temperature locks 46 are the tape bundles step by step by a walking beam transport device 49 moves, each with the winding machines 39 and 46 via a coil transport car 50 are in transport connection.

At least the coil transport carriage 50, which the furnace section 42 is assigned, it also has a turntable, with the help of which the Ribbon bundles can be turned by 180.

In the furnace section 43 is a transport vehicle as a transport device 51 is provided, which in the longitudinal direction of the furnace section 43 with the help of an apron belt drive 52 can be moved back and forth. This trolley 51 has supports 53 for several, for example. Three, band bundles, wherein the stock 53 are designed so that them the individual band bundles with the help of the walking beam transport device 49 of the furnace section 42 can be passed, while vice versa, by the walking beam transport device 49 of the furnace section 44, the band bundles are lifted off therefrom again individually.

In order for a uniform temperature equalization within the heating furnace 41 takes place on each individual band, the supports for the band are in each individual furnace section 42, 43, 44 by means of rotationally driven rollers 54 and 55, respectively formed, as can be seen from FIGS. 5 to 8.

It should also be mentioned that the walking beam transport devices 49 in the two furnace sections 42 and 44 are designed so that the lifting drive and displacement drive the walking beam can be effected separately from each other. This ensures that a functionally reliable transfer of the band bundles from the walking beam 49 of the furnace section 42 takes place on the trolley 51 of the furnace section 43 and, on the other hand, also an equally trouble-free takeover of the band bundles from the trolley 51 to the Lifting beam 49 of the furnace section 44 can be made.

It should also be mentioned that the support rollers 54 for the tape bundles in the furnace sections 42 and 44 independently of the walking beams 4) and on both sides next to these are rotatably mounted, while the support rollers 55 of the support 53 can be moved with the trolley 51.

9 can also be seen that the two winding machines 39 and 46 of the auxiliary system 38 work with opposite winding directions, such that the end of the sliver received by the winding machine 39 as the beginning of the tape runs from the winding machine 46. This arrangement of the winding machine 39 and 46 makes it necessary either the transfer device 40 or the transfer device 45 (Fig. 4) as a coil transport carriage 50 with a turntable.

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Claims (17)

Claims W Method for avoiding the accumulation of scrap in continuous broadband mills in the event of malfunctions in the finishing mill and / or on of the reel system, which shows that the pre-strip (7) is at Leaving the roughing train (2) wound into bundles (9), then stored and kept on rolling heat (11) and then with unwinding (9) from the federal government the finishing train (3) is fed. 2, method according to claim 1, characterized in that the band collar before introducing the pre-strip (7) stored on it into the finishing train (3) is turned around 1800 (1o, 20). 3. The method according to claims 1 and 2, characterized in that that the band collar is turned (1o, 20) before it is kept warm or heated (11). 4. The method according to claims 1 to 3, d a d u r c h g e k e n It does not show that the band is used for keeping warm (11) and / or turning (10, 20) the rolling line is moved (lo, 21). 5. Process according to claims 1 to 4, characterized in that that the pre-strip (7) is pre-bent (15) before winding (9). 6. The method according to claims 1 to 5, characterized in that that the pre-strip (7) when unwinding (9) is directed from the federal government (16). 7. Procedure for temperature control of pre-strip after the run-out from the roughing train and before entering the subsequent finishing train, in which the pre-strip, in particular according to claims 1 to 6, when leaving the roughing train Coiled into bundles, then heat treated and then shrink-wrapped the finishing train is unwound from the coils, characterized in that that the band bundles first of all a temperature decrease below the rolling temperature of the Finishing train (33) subjected (42, 43) and immediately afterwards to the exact Finishing train rolling temperature are heated (44). 8. Plant for carrying out the method according to one or more of claims 1 to 6, characterized in that in the rolling line between roughing train (2) and finishing train (3) a winding machine (9) for winding and unwinding is that outside the rolling line laterally next to the winding machine (9) Heating furnace (11) is located and that between the winding machine (9) and the heating furnace (11) a coil transport device (10) can be moved back and forth (21, 22). 9. Plant according to claim 8, characterized in that the winding machine (9) a strip pre-bending device (15) on the roughing train side and a strip pre-bending device (15) on the finishing train side a strip straightening machine (16) is assigned. 40. Plant according to claims 8 and 9, characterized in that the heating furnace (11) forms a store for several strip bundles. 11. Plant according to claims 8 to 1o, characterized in that a temperature lock (14) is connected upstream of the heating furnace (10) on the loading and unloading side is 12. Plant according to claims 8 to 11, characterized in that the bundle transport device (1o) consists of a coil carriage (21), which is below the winding machine (9) and of the heating furnace (11) is movable and a liftable and lowerable turntable (20) for which has band bundles which can be raised into the heating furnace (11). 13. Plant according to claims 8 to 12, characterized in that the turntable (20) of the coil carriage (21) in a space between the winding machine (9) and heating furnace (11) can be rotated by 1800 about a vertical axis. 14. Plant, in particular according to claims 8 to 13, for implementation of the method according to claim 7, the fact that the heating furnace (41) arranged outside the rolling line at least one of the roughing train (32) leading away temperature reduction zone (42) and one leading to the finishing train (33) Has temperature increase zone (44). 15. Plant according to claim 14, characterized in that the heating furnace (41) contains three separable (45) temperature zones (42, 43, 44), of which the first two temperature zones (42, 43) together form the temperature reduction zone form. 16. Plant according to claims 14 and 15, characterized in that that each of the three temperature zones (42, 43, 44) of the heating furnace (41) has a memory for several belt bundles and each has its own transport device (49, 51, 49) contains. 17. Plant according to claims 14 to 16, characterized in that that the three temperature zones (42, 43, 44) of the heating furnace (413 each in the right Angle to each other are arranged and with each other a substantially U-shaped Form a floor plan.