AT404803B - METHOD FOR PROCESSING MOLDED METAL PRODUCTS - Google Patents

Description

ΑΤ 404 803 Β

The invention relates to a method for processing cast metal products such as blanks or strips, preferably made of non-ferrous metals or alloys such as brasses, bronzes, aluminum and aluminum alloys or the like, and a system for processing these metal products for arrangement behind casting systems for these metal products.

It is known to further roll out plates or strips obtained by discontinuous continuous casting, which are subsequently hot-rolled and milled and which have been rolled out, for example, from bars or frames. Transport is carried out here in the rolling process by means of excessively long transport roller tables arranged on both sides of a reversible rolling mill. Subsequent to this cold roughing and before the subsequent actual cold rolling of the still very thick strip, it is rolled into a loose bundle.

Preferably continuously cast strips are usually cut to length in the production line of a strip casting system, milled on the top and bottom, then also pre-curved and rolled up into loose bundles. For example, WO-92/21454 describes a process in which cast pieces are first hot-rolled, then milled and finally cold-rolled. The strip is wound up before cold rolling. EP-0 264 459 A1 shows a method for producing hot-rolled steel strip, in which a storage furnace is interposed and the strip is wound up on a reel after the hot rolling process. AT 345 232 B shows a method for reducing the cross section and rolling, in particular metal wires, in which the surface is roughed in order to remove the zones which are defective in casting.

In the rolled-up state, the loose bundles are transported to a chain conveyor of a cold rolling system, for example by means of a forklift or the like, where the bundles are pre-conveyed in time and transferred to a unwinding machine. Bundle opener auxiliary devices and rough straightening machines are necessarily connected at least in order to ensure that the strip runs horizontally into the roll gap. This naturally involves a great deal of expenditure in terms of equipment, motor technology, control technology and thus also financially. This is all the more true since a milling machine and the pre-bending and reeling machines have to be provided for each casting line.

In addition, the conventional systems have the disadvantage that the cast skin, which would have the greatest adverse effect on the material quality during cold rolling, is removed, but that milling chips caused by the milling could easily have remained on the strip when rolled in and the surface quality of the end product was disadvantageous during the subsequent rolling influence. The oxide layer of the strips formed by intermediate storage or transport time also leads to negative impairments of the surface and would have to be removed again by pickling or peeling before a cold rolling process in order to produce products with good surface quality.

The object of the present invention is to avoid the above-mentioned disadvantages of the conventional methods and to produce products with the best surface quality without the otherwise usual, high mechanical outlay.

To achieve this object it is provided according to the invention that the cast products originating from at least one casting installation are temporarily stored in a substantially planar form after being cut to length, then milled in succession in a single installation and fed directly into a single cold rolling installation.

By omitting the roll-up of the strips into loose bundles, the machines required for this and, of course, all the unwinding, coil opening auxiliary and straightening machines that are conventionally required in front of the cold rolling system are no longer required. In the case of strips originating from at least two casting lines, these can be treated together with only one milling machine and can be guided further to only one cold rolling system, so that in this case the mechanical, motor, control and financial expenditure can be considerably reduced again. Finally, the milling of a flat strip immediately before cold rolling ensures that no milling chips remain on the strip and that a bright metallic strip is rolled without any oxide layer, both of which guarantee the optimal surface quality of the rolled product.

According to a further feature of the invention, the cast products are rolled to the desired thickness in the common cold rolling mill using the reversing method, the products being rolled up and unwound at least initially on winding wheels arranged on both sides of the rolling mill during the rolling process. The thicker strip material is due to the larger bending radius before bending breaks, so-called " coil breaks " protected and there is no need for rough straightening again.

In order to be able to save at least one or even more slow-running milling machines in conventional strip casting systems, it is preferably provided that the milling machine arranged directly in front of the cold rolling system is operated at a faster speed than in conventional strip casting or rolling systems. So far, the speed of the belts due to the 2nd

AT 404 803 B low speed of the casting plants for non-ferrous metals at 0.2 to 6 m / min, for aluminum or its alloys at best 35 m / min. According to the invention, belt speeds during milling are provided above these values, which are up to 75 m / min can be, preferably up to 250 m / min.

If, according to a further feature of the invention, the strips rolled to the desired thickness are wound onto a reel drum on the side opposite the milling machine after the last pass through the cold rolling system, the collapsible structure of this drum makes it easy to pull off the finished bundle and to remove it possible.

According to a further feature of the invention, the method is further characterized in that after the end of the casting and, if necessary, the cutting to length and before the milling process, the products are moved in a substantially flat shape parallel to one another only perpendicularly to their longitudinal direction. This allows the arrangement of all system parts in the smallest possible space and the use of simply constructed and also easy to control transport devices.

The plant for the dissemination of cast metal products such as ingots, slabs, plates or strips, preferably made of non-ferrous metals or alloys such as brasses, bronzes, aluminum and aluminum alloys or the like, is intended to be arranged behind at least one casting plant for these metal products, so that they can be installed as well can also be retrofitted in new casting plants as a replacement for outdated or repaired rolling or roughing lines.

The system is characterized according to the invention by a roller table in connection with the or each casting system, which casting systems can at most be provided with a subsequent cutting machine, for example sledge shears, an intermediate storage area for the products, a single further roller table with only one subsequent milling machine and a single reversible cold rolling mill directly behind the milling machine mentioned, the cold rolling mill being provided on both sides with winding wheels for winding and unwinding the product during cold rolling and with a reel drum opposite the milling machine for taking up the product after the last pass through the cold rolling mill.

Due to the intermediate storage in flat condition and the long roller tables, a slightly larger space is required than with conventional systems, but all system parts associated with rolling up and rewinding can be omitted. In addition, only a single milling machine and a single cold rolling system are required for all existing casting lines, even for several of them. The lower foundation and system costs far outweigh the somewhat higher costs due to the increased space requirement.

It is advantageously provided that the milling machine runs at a higher speed than in conventional systems, preferably at belt speeds of over 35 m / min up to 75 m / min, preferably up to 250 m / min, and by means of electronic circuits exactly at the speed of the rolling line is coordinated and synchronized.

According to a further feature of the invention, the system is characterized in that the axes of the reel drum and the winding wheel located on the same side of the roll stand are parallel to one another, and the reel drum and the winding wheel are preferably axially displaceably mounted. This feature also simplifies the construction of the system and makes it more economical.

The axes of the reel drum and of the winding wheel located on the same side of the roll stand are preferably coaxial with one another, the reel drum and the winding wheel being able to be optionally shifted into the center line of the rolling mill. The two axes preferably form a common shaft which is driven by a single drive device.

The smallest possible space and foundation requirement as well as the construction of the system with simple transport devices is given if, according to a further feature, the roller tables are arranged parallel to one another and preferably perpendicular to their longitudinal axes and a suction belt stacker that is also movable parallel to the longitudinal axes of the roller tables is provided for transporting the products is.

In the following description, the invention is to be explained in more detail on the basis of a preferred, but in no way restricting, exemplary embodiment with reference to the attached drawings.

1 shows a front view of a conventional cold rolling mill for coils rolled up to form loose bundles, FIGS. 2A and 2B show a side view and a top view of a plant according to an embodiment of the present invention, FIGS. 3A and 3B show a side view and a top view of a plant 4A and 4B show a side view and a top view of a system according to a third embodiment of the invention, FIG. 5 shows a side view 3

AT 404 803 B of the actual rolling plant according to an embodiment of the plant according to the invention, FIG. 6 is a plan view of the rolling plant of FIG. 5, FIG. 7 shows a further embodiment for a rolling plant according to the invention, FIG. 8 is a plan view of the plant 7 and 9 is a section through a winding device according to the invention.

The conventional system shown in Fig. 1 consists of a chain conveyor 1, on which the loose bundles B transported to the system are stored. The chain conveyor 1 brings the bundles B one after the other to the unwinding and coil opening station 2, to which the strip start is then straightened in a rough straightening system 3 and guided and drawn in via a transfer table 3 'which can be pivoted about a horizontal axis, so that it is horizontal in the roll gap 6 of the cold rolling system comes in.

The roll stand 19 consists of a number of rolls, in particular the rolls 61 forming the nip 6, and drive or support devices, a suction device 9 being arranged above the stand 19. After the first passage through the nip 6 and a few more times, the strip is wound up on a large diameter winding wheel 8. After the strip has completely passed through the roll gap 6, the direction of the strip travel is reversed and the strip passes through the roll gap 6 in the opposite direction, this time being wound up on the winding wheel 4. This process is repeated until the strip is sufficiently thin so that it can be wound onto one of two reel drums 5 and 7 arranged on both sides of the roll stand 19. These circumferentially collapsible drums 5 and 7 then also take up the finished rolled bundle, and these finished bundles are removed from the drums 5 and 7 after their circumference has been reduced.

A first variant of the invention is shown in FIGS. 2A and 2B. The cast metal strip 11 is fed from a strip casting furnace 10 to a roller table 13, the length of which corresponds to the longest strip length of the system. After a certain length, the band 11 is cut to length by a cross-cutting device, for example a sledge shear 12, and is placed on a stack 14, if necessary one of several, advantageously parallel to the roller table 13 by means of a suction belt stacker 15. If a find is now to be rolled, it is deposited from one or the stack 14 by the suction belt stacker 15 onto a further roller table 16, which is preferably oriented parallel to the first roller table 13 and is advantageously equally long, from where it is fed by only one milling machine 17 with a belt speed of Above 35 m / min up to 75 m / min, preferably up to 250 m / min, is fed directly to the roll stand 19. The roll stand 19 with the rolls 61 forming the roll gap 6 has two winding wheels 18, 20 with a fixed diameter and circumference. From a coolant system 21, coolant is fed in for the rolling process in the circuit and then removed again for cleaning and cooling in this system 21. The finished rolled bundles 28 are laterally removed from a reel drum preferably arranged adjacent to the winding wheel 20, as will be explained in more detail below.

3A and 3B show a system similar to that of FIGS. 2A and 2B, the same reference numerals identifying the same system parts. However, two casting lines are now planned. Two, advantageously adjacent and parallel aligned casting furnaces 10, as could also be provided in the system of FIGS. 2A and 2B, each pour two parallel belts 11 and 11 ', respectively. These belts are guided in parallel on again advantageously mutually parallel roller tables 13, preferably cut to length by sled shears 12 per casting line and then deposited on one or more stacks 14 by a suction belt stacker 15. These stacks 14 are preferably oriented parallel to one another and parallel to the roller tables 13. As already described for FIGS. 2A and 2B, the strips to be rolled are removed from the respective stack 14 by means of the suction belt conveyor 15 and again placed individually on only one further, preferably again parallel, roller table 16, which of course does not have to be as wide as the roller tables 13, from where they are fed to the single milling machine 17 and then to the roll stand 19. Due to the different speeds of the casting and the faster subsequent rolling, the strips produced can be processed almost continuously. By casting two tapes each, but jointly processing the parallel cast tapes " serial " one after the other, instead of the previously required milling machine for the width of two belts or instead of two machines working side by side, only a single milling machine 17 is required for the width of a single belt, which in turn brings cost advantages.

4A and 4B show a system in which the advantages according to the invention emerge most strongly, since here there are three adjacent casting lines, in which the one casting furnace 10 produces two parallel belts 11 and 11 'per line, which are based on the wider ones Roller tables 13 are performed. The subsequent steps correspond to the sequences already described, with again only a milling machine 17 and an immediately following rolling device 19 being provided. 4th

Claims (9)

ΑΤ 404 803 Β Fig. 5 shows a side view of a rolling mill modified according to the invention for a system according to the invention, wherein after the one milling machine 17 per rolling line, a transfer device 24 which can be pivoted about a horizontal axis, the strip passes through the roll gap 6 from the rolls 61 over a first pass Winding drum 18 with a fixed diameter or circumference, through a brushing device 25, past sensors 26 for controlling the rolling process into the nip 6. On the side of the roll stand 19 opposite the milling machine 17, there is a reel drum 22 and, separately therefrom, a winding wheel 23 with a fixed diameter or circumference for winding up the strip, the strip being provided during the rolling process with the known clamping devices for the respective strip end Winding wheels 18 and 23 wound up and unwound and only after the last pass, if necessary even before reaching a strip thickness at which no bending breaks can occur, through the nip 6 instead of onto the winding wheel 20 onto the reel drum which can collapse in terms of circumference or diameter 22 is wound up. Of course, sensors 26 and a brushing device 25 are also provided on the side of the roll stand 19 opposite the milling machine 17. The control of the rolling process and the rolling stand 19 takes place via the sensors 26, which respond as soon as the end of the strip has passed their position, whereupon the direction of transport of the strip is reversed. Furthermore, depending on the progress of the rolling process, a higher pressure and, due to the continuously reduced strip thickness, a higher speed are set. 6, in addition to the roll stand 19, the drive 27 of the rollers 61, the winding wheels 18, 23 with a fixed diameter, the reel drum 22 and its drives 18 ', 23' and 22 ', the circumferentially collapsible ones Recognize the reel drum 22, axially pushed down, finished rolled bundles 28. FIG. 7 shows a rolling mill similar to that in FIG. 5. Here, however, a combined winding reel drum 20 described in more detail with reference to FIG. 9 is used. The finished rolled bundles 28 can also be seen here in the top view in FIG. 8. FIG. 9 shows a section through a combined winding wheel reel drum 20. The actual winding wheel 29 and the reel drum 30, which is designed to be collapsible in order to be able to remove the bundles 28, are located on a common drive driven by the drive device 20 ' Wave 32. As needed, d. H. depending on the strip thickness of the strip to be wound up, its windability or the progress of the rolling process, either the winding wheel 29 or the reel drum 30 (as shown in the drawing figure) is shifted into the strip center line 31. After completion, the bundles 28 are laterally removed from the reel drum 30 and put down. 1. Process for the processing of cast metal products such as blanks or strips, preferably made of non-ferrous metals or alloys such as brasses, bronzes, aluminum and aluminum alloys or the like, characterized in that the cast products originating from at least one casting installation, preferably from several casting installations at most a cut to length in a manner known per se in an essentially planar form and then milled one after the other in a single system and fed directly into a single cold rolling system. 2. The method according to claim 1, characterized in that the cast products are rolled in the common cold rolling mill in a reversing process to the desired thickness, the products being rolled up and unwound at least initially on both sides of the rolling mill fixed winding wheels during rolling. 3. The method according to claim 1 or 2, characterized in that the milling machine arranged directly in front of the cold rolling system is operated at a higher strip speed than in conventional strip casting or cold rolling systems, with over 35 m / min up to 75 m / min, preferably up to 250 m / min. 4. The method according to any one of claims 1 to 3, characterized in that the strips rolled to the desired thickness are wound onto a reel drum at least after the last pass through the cold rolling system on the side opposite the milling machine. 5. The method according to any one of the preceding claims, characterized in that the products after the end of the casting and possibly the cutting to length and before the milling process are moved in a substantially flat shape parallel to each other only perpendicular to their longitudinal direction. 5 AT 404 803 B 6. Plant for processing cast metal products such as blanks or strips, preferably made of non-ferrous metals or alloys such as bronze, aluminum and aluminum alloys or the like, for arrangement behind at least one casting plant, preferably behind several casting plants for the metal products, each characterized by a roller table ( 13) following the or each casting system (10), soft casting systems can at most be provided with a subsequent cutting machine, for example sled shears (12), an intermediate storage area (14) for the products, a single further roller table (16) only a subsequent milling machine (17) and a single reversible cold rolling system (19) immediately behind the milling machine mentioned, the cold rolling system (19) on both sides with winding wheels (18, 20, 23) for winding and unwinding the product during cold rolling and with one the reel opposite the milling machine (17) drum (22) for receiving the product is provided at least after the last pass through the cold rolling system. 7. Plant according to claim 6, characterized in that the axes of the reel drum (22) and the winding wheel (23) located on the same side of the roll stand are parallel to one another, and the reel drum and the winding wheel are preferably axially displaceably mounted. 8. Plant according to claim 7, characterized in that the axes of the reel drum (22) and the winding wheel (23) located on the same side of the roll stand are coaxial with one another, preferably forming a single shaft (32), the reel drum and the Optionally, the winding wheel can be moved into the center line (31) of the rolling mill. 9. Plant according to one of claims 6 to 8, characterized in that the roller tables (13, 16) arranged parallel to one another and preferably perpendicular to their longitudinal axes next to each other and a parallel to the longitudinal axes of the roller tables movable suction belt stacker (15) for transporting the products is provided. Including 9 sheets of drawings 6