RU2104105C1 - Continuous stand group of mill for making thick strips - Google Patents

Abstract

FIELD: hot rolling of thick strips. SUBSTANCE: continuous stand group of mill includes two or three rolling stands, guiding rollers, tables, reversing coiler, finishing line with flying shears. Said stands (two-high and(or) three-high stands ) are in the form of compact united block. Second stand is non-driven one. Finishing line is placed in front of said stands. EFFECT: improved design. 3 cl, 4 dwg

Description

 The invention is intended for the production of thick strips and tapes of non-ferrous metals and their alloys, in particular aluminum and copper. The continuous group of the rolling mill can be used in the hot rolling lines of thick strips and tapes, as well as in the rolling lines of tapes and strips immediately after casting.

 The prior art, for example, is an installation for hot rolling of tapes or sheet blanks, containing successively a roughing stand, a front reversing winder, two reversing stands and a rear reversing winder, all stands being equipped with four-roll sets [1]. The main disadvantages of the above device is, firstly, its bulkiness due to the presence of quarto stands, as well as the irrational use of space in the placement of stands separately from each other, and, secondly, the need for a complex circuit of electrical equipment and a drive for this device.

 Also known is a rolling mill for the production of a thin metal strip containing a block of two identical quarto stands [2].

 The disadvantages of this mill are the complexity of the drive mill and electrical equipment; the mill is intended for a certain type of product and cannot be used unchanged; the angle of capture is small when the strip is set in the mill rolls, which does not allow a stable rolling process of thick strips; even when 50% reduction is achieved, the mill as a whole is very bulky and must be installed in a workshop with high floors, and must also be equipped with heavy cranes to move the mill rolls, the “quarto” during transshipment.

 The closest analogue of the invention is a continuous group of the mill for the production of strips, containing two multi-roll rolling stands with reversing coilers, wire tables [3]. However, this group of the mill is cumbersome and cannot be used to produce thick strips up to 9-10 mm thick.

 According to the invention, a continuous group of a mill for hot rolling of thick strips comprises two or three rolling stands, tables, a reversing winder, setting rollers, a cutting line with flying scissors. The stands are made in the form of a compact single unit with two-roll and / or three-roll sets. The second stand can be non-driven, and a cutting line is located in front of the stands.

The proposed continuous group allows you to create the following cage blocks below, used under various rolling conditions, for example:
a) a single block of two three-roll stands can be used for rolling aluminum. This device has several advantages, including the possibility of partial transshipment, i.e. transshipment of only the middle compensating roll. This block can be made driven from one gearbox or from two gearboxes. In the latter case, the second stand is made with the drive of only one lower roll. Since the capture angle in the trio stands is low compared to the duo stands, master rollers are provided in front of the first stand, the upper presser (hydraulic presser provided) the roller is non-driveable, and the lower roller is driven by turning on the magnetic coupling only at the time of the strip task in rolling mill. Such master rollers may have two lower drive rollers and one upper pressure roller;
b) a single block of two stands - two-roll and three-roll can be made with the drive first stand of the duo, having a relatively large angle of capture. Moreover, the second stand can be made with only one lower drive roll. In this case, the middle roll of the second stand receives rotation from the lower drive roll, and the upper from the strip feed. This block allows idle feed of the tape back through both stands, which is associated with the filling of the tape into the winder;
c) the block may also consist of two two-roll stands. The first stand is made with two drive rolls. The second stand is either non-driven or with only one lower drive roll. This unit also allows reverse feed of the tape. A block of two duo stands is characterized by a large angle of capture and can be used for rolling copper strips or is included in the process of obtaining the BPL tape (non-continuous rolling of the tape), where the first stand with casting rolls, the second with non-drive rolls. Moreover, the block stand can have a drive from only one gear;
d) a block consisting of three stands can have various combinations of three and two roll stands. The unit has a drive from two gearboxes: the first stand - from one gearbox, the second and third stands - from another gearbox. For example, the first two-roll stand is equipped with one gearbox, two three-roll stands have another gearbox, and only the lower rolls of the trio stands are driven. This last version of the block can be used for rolling aluminum. Moreover, the two stands of the trio will allow a stable rolling process simultaneously in two stands with compression of about 50-60%, which will allow to obtain high quality rolled products and reduce the length of the drive roller table to the hot rolling mill.

 It should also be noted that in the General case, the bed 7 (17) of the continuous group has the form of a frame with openings for rolls.

 Using the proposed continuous group will allow you to get hot rolling strips - from slabbing twice as thick as usual and to improve the quality of hire, that is, to exclude the receipt of a wavy with a bent filling end of the hire. The proposed group of the mill will allow to achieve large values of reductions from 50%, without using more powerful equipment, such as a quarto mill, which will also save the amount of space occupied by the rolling equipment.

 In particular, the mill group can be placed in a workshop with a lower height than is required to accommodate the quarto mill. And also when operating the proposed mill group, it is necessary to use more compact auxiliary equipment.

 One of the advantages of the proposed continuous group of the mill is that when re-equipping the rolling mill for the installation of cage blocks, the drives and sets of rolls of the rolling mill of the old traditional layout can be used.

 Gear stands can also be integrated into blocks, for example trio stands.

 The continuous group of the mill also contains a drum winder with lower winding and with a reverse drive having a filling slot.

 The winder is located behind the last second or third stand.

 When rolling the tape, two-way control of the rolling is carried out, a reeling line with flying scissors is installed behind the coiler (i.e., in front of the stands and coiler) and a sheet stacker can be installed.

 In FIG. 1 shows a continuous mill group with two trio stands; in FIG. 2 - a continuous group of a camp with two stands of a trio and one duo; in FIG. 3 - a fragment of the output end of the mill group; in FIG. 4 - placement of the ingot after cutting on the feed roller table and the dimensions of the ends of the ingot.

 The continuous group of the mill for hot rolling of thick strips contains (see Fig. 1, 2) two stands 1, 2 or three stands 11, 12, 13 having two and / or three-roll sets of rolls (drive rolls are designated VI, VII), reverse winder 6 (16), defining rollers 8 (18), flying scissors 9 (19), tables 5 (15).

 The stands are made in the form of a single block 7 (17).

 The group is also equipped with the feed roller 4 (14).

 The continuous group of the mill for rolling strips is as follows. From the slab (or from the continuous spill installation) along the rolling table 4 (14), the strip 10 with a thickness of 20-25 mm enters the block stand 1-2 (11-12-13), and with the help of the setting rollers 8 (18) it is set into the stand . Next, the tape or strip is rolled in stands 1-2 (11-12-13), and the strip is sent to the next stand on table 5 (15). At the exit from the cage block, a rolled strip or tape 9–10 mm thick is fed into the coiler 6 (16) and, after the tension on the coiler has been established, the rolling process continues. After the rental of rolls from the rolls of the block stands, the reel 6 (16) is turned off. Then carry out strapping and removal of the roll from the winder, transportation and laying of the roll on the rack. In this case, if necessary, the rolling process is continued.

 Rolling in a three-stand block of stands 11-12-13 (two trios and one duo) can be carried out without master rollers. The strip to be refueled in the stand is 5-10 mm thicker compared to the strip to be inserted into the block of duo stands.

 The continuous group of the mill can also be equipped with the correct machine B, used as follows (see Fig. 3).

 For the output end of the stand 13 of block 17 with tables 15 and drive rolls VI and VII, a winder 16 is placed. The winder is transferred to the unwinding position 16 'at the end of rolling. The end of the roll 20 is brought into the correct machine B (with three or five rollers) and then sent for cutting (scissors in Fig. 3 are not shown).

 Moreover, the upper turn of the roll 20 is pressed by the lower pressure roller 21.

 The equipment of the group allows you to send after rolling the tape 10 for cutting with flying scissors 9, bypassing the winder 6. Next, the rental is sent to a tape layer (not shown).

 It is also possible to place scissors 19 in front of the input end of the stand block for automatic cutting of the rear end of the strips during rolling, which allows you to install a lower power drive for the lower reel of the coiler with a knife, i.e. the main effort to cut the strip is due to the rolling stand 1 (11). Upper drum non-power.

 Placing scissors 9 behind the winder 6 and the output end of the cage 2 also allows you to trim the front end of the strip 10, which is passed to the flying scissors and cut, and after feeding back into the winder with a further continuation of the rolling process. It should be noted that flywheel scissors can also be used - simpler to use than drum scissors.

 In FIG. 4, the dotted line indicates the part of the ingot A (slab) cut by a saw at an angle to the surface of the ingot (slab). Such an ingot B is fed by a live roll 4 (14) with an oblique cut forward, which prevents broadening of the ends of the strip after rolling.

 Cutting ingots thicker than 200 mm occurs at right angles.

 Thus, the continuous group of the mill according to the invention allows, in addition to rolling, also cutting (cutting) the strips into a measured length in hot rolled form, which increases the productivity of slabing two times or more.

 During the construction of rolling workshops, the aforementioned continuous groups of the mill can be alternated: the second first block can be followed by the second at a distance of 2 m. According to a similar scheme, you can build block lines from stands or similar three-stand lines. Thus, a rolling mill line consisting of continuous groups may contain an even or odd number of stands.

 The cost-effectiveness of the construction and operation of continuous rolling mill groups is due to a reduction in the cost of building a block stand compared to the construction of individual stands, a 2-fold increase in the productivity of slabs and a rolling mill as a whole, and an increase in the quality of rolled products, especially in the production of foil.

 Thus, the construction of such lines from continuous groups is expedient and profitable, especially where production areas are small.

Claims (3)

 1. A continuous group of a mill for hot rolling of thick strips, containing rolling stands with a reversing winder and with tables, characterized in that the group contains two or three stands made in the form of a compact single unit, and the stands of the group are made of two-roll and / or three-roll, group also equipped with set rollers and a cutting line with flying scissors.  2. The group according to claim 1, characterized in that the second stand of the group is non-driven.  3. The group according to claim 1 or 2, characterized in that the cutting line is located in front of the stands.

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