RU2550456C2 - Compact reversing universal unit for production of average-long-size sections - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. Compact reversing rolling mill comprises reduction stand 14, two-roll stand 15 and universal stand 16 to form reversing mid module 12 at roller bearings 13 for workpiece 17 to displace there over. Universal finishing stand 11 is located directly behind said module 12 to make a final finishing stand arranged across common roller bearings 13. Finishing stand 11 is kept open at cycle intermediate passes and is closed before the final pass of said ingot 17.

EFFECT: flexible process, higher quality of rolling.

10 cl, 4 dwg

Description

This invention relates to a compact reversible universal installation for the production of medium-large size profiles.

Over the past ten years, economic development and research has led to an increased use of ever newer civil engineering solutions that use profiles widely to improve versatility, lightness and resilience, and this has led steel manufacturers to turn the market towards manufacturing solutions such profiles. Indeed, the use of lightweight, resilient structures is becoming an essential requirement for the construction of tall buildings and when used in increasingly more extreme architectural solutions.

Population growth in already densely populated areas leads to the construction of ever-higher skyscrapers that require structures that are both resilient and rigid.

In this context, therefore, the market requirements for medium-large profiles have increased significantly, and as a result, large industrial groups consider the profile market as increasingly profitable and, therefore, provide for the possibility of placing their investments in installations that allow the production of this type of product.

Given this need, plant manufacturers are inclined towards the production of technical plants for the production of medium-large profiles (beams, IPE, IPN, HE, sheet piles, corners, etc.). Essentially, there are three installations and technological solutions currently available.

1. Continuous high-quality rolling mill.

2. Semi-continuous high-quality rolling mill.

3. Reversible high-quality rolling mill.

The reversible rolling mill in the third solution provides various advantages compared to the continuous rolling mill in the first two paragraphs, but the main factor essentially represents lower initial investment costs. Indeed, reversible rolling mills reduce the amount of equipment required for rolling, provide the possibility of using smaller rooms and reduce the amount of relevant work related to construction, provide advantages associated with processing and productivity, etc.

Therefore, reversible rolling mills are generally the preferred type.

Patent EP 256409 B1 of SMS describes a process for producing such profiles using a reversible rolling mill known as “X-H”.

The X-H processing solution adopted by SMS for the production of profiles necessitates the use of one or more reversible crimping stands and an intermediate reversing finishing stand (tandem) comprising a universal crimping stand, a two-roll stand and a universal stand that performs dual crimping and finishing functions.

This reduces the number of stands required in a reversing rolling mill.

Such a solution, however, presents disadvantages.

The most significant drawback is the need to use the last stand in the finishing stand, as a crimping stand and finishing stand. This, obviously, creates significant problems with the wear of the rolls, which, subjected to significant loads for crimping the material in the intermediate phases, generate such wear that requires frequent change of the rolls in order to withstand the required dimensional tolerances.

An alternative solution for the production of profiles is also used using another reversible rolling mill.

This solution provides for the use of one or more crimping stands, an intermediate reversing rolling mill containing U-H-U (like that of a competitor) and a continuous finishing stand containing a horizontal stand (providing an edger function if necessary) and a universal stand.

An additional stand is provided at a distance from the intermediate reversing rolling mill and is therefore connected using roller bearings and is located as a finishing stand next to the cooling rack.

In this solution, the last stand in the finishing stand has a duration that is 2-3 times longer than in the solution in accordance with the SMS patent mentioned above, which leads to the use of a significantly smaller number of plants in production for replacing rolls and therefore requires significantly less technical service.

In this last alternative solution for installing an SMS with an additional finishing stand, the last stand is not used for intermediate phases. This additional stand is subjected to significantly less stress and therefore less wear, allowing the rolling of even more tons, without concern about the quality of the final product.

In this embodiment, an additional stand is used, in contrast to the above patent.

In addition, this arrangement requires additional or specific equipment for the production of profiles.

Indeed, the finishing stand, roller bearings and all structural work and facilities related to a longer installation increase the total investment of the client.

The general purpose of the present invention is to solve the above-mentioned disadvantages of the prior art in an extremely simple, economical and, in particular, functional manner.

Another goal is to provide a reversible rolling mill that is more compact than currently available.

Another goal is to provide a reversible rolling mill, which minimizes the cost of installation associated with construction work and the required space.

Given the above objectives, the present invention describes a compact reversible universal rolling mill for the production of medium-large profiles, having the characteristics presented in the attached claims.

The structural and functional properties of the present invention and its advantages, compared with the prior art, will be even more obvious as a result of studying the description below, with reference to the attached drawings, which show an embodiment of a compact reversible universal rolling mill for the production of medium-large profiles in accordance with this invention.

In the drawings:

figure 1 shows the basic elements of a compact reversible universal rolling mill for medium-large profiles in accordance with this invention;

figure 2 shows a first embodiment of a plant known as "Form I", which includes a rolling mill in accordance with the invention;

figure 3 shows a second embodiment of a plant known as "U shape", which includes a rolling mill in accordance with the invention;

figure 4 shows a third embodiment of a mixed type plant, which also includes a rolling mill in accordance with the invention.

First of all, we will consider figure 1, in which a compact reversible universal rolling mill for the production of medium-large profiles is indicated generally by the reference numeral 10.

As shown, in accordance with this invention, the reversible universal rolling mill 10 provides for the placement of the universal finishing stand 11 as the final additional stand in the reversible intermediate module 12 through the roller bearings 13, on which the processed block 17 moves.

The reversible intermediate module 12 includes a first universal crimp stand 14, a twin roll stand 15 and a second universal crimp stand 16.

The function of such an additional stand 11 does not change, since it is always and exclusively used for finishing. Therefore, stand 11 is always open during intermediate passes and closes only before the bar finishes the last pass in the production cycle.

In an alternative solution, in which only arrow F appears in FIG. 1, cage 11 is kept closed in the ready position away from the roller bearings 13, and passage through it is performed only before the last passage of the bar 17.

The cage 11 therefore moves perpendicular to the direction of movement of the bar 17, which is gradually processed by the cage 11. This movement, for example, is affected by the corresponding actuator module, shown in position 18, which can be connected and disconnected from the actuators installed in the cage 11.

This ensures that the notch time values remain unchanged, providing the above processing advantages.

The arrangement consists of solution X-X-H, which uses a reversing rolling mill comprising four complete stands substantially limiting the distance between the finishing stand 11 and the reversing intermediate module 12.

Indeed, such a finishing stand 11 is no longer placed at a distance from the reversible intermediate module 12, as described in the prior art, but placed immediately after the last universal stand of the same reversible module 12.

As a result, the total length of the installation becomes shorter than in the solution used to date, and therefore requires less mechanical equipment and a smaller total area of the building to house the rolling mill, with obvious savings for the client with respect to installations, as in the case of turnkey delivery so no.

The presence of an additional finishing stand also improves the quality of the final product, and also improves the flexibility of the process.

In addition, the option in which the customer is offered an even more compact installation, such as in accordance with the present invention, provides participation in contracts where the installation area is not critical, as well as participation in contracts where the actual layout is critical for the installation of the rolling mill.

Increased productivity shifts the higher initial costs for the installation in accordance with the invention, compared with known installations, to a level of less than one year of operation of the installation, depending on the productivity of the installation and the number of tons during the service life.

The service life of the universal finishing stand rolls according to the invention is approximately 2000 tons for smaller profiles and approximately 3000 tons for larger ones.

This may mean that for smaller production batches, when using our solution, the installation may never stop to replace the roll streams compared to one or two stops to replace the rolls in the finishing stand of the prior art. Similar benefits can be obtained for large production batches by reducing stops to a maximum of one for changing rolls in the finishing stand.

This ensures that the values of the service life of the streams remain unchanged, providing the above advantages in production

The proposed solution can be designated as "XXH".

The advantages of the XXH solution compared to the existing solution are the smaller total area occupied by the installation, and the option that enables the production of two plate bars for each bloom blank produced during optimization of loads in the furnace.

Using the XXH solution, the structural part of the installation is significantly cheaper.

From the point of view of the prospects of performing operations, the proposed layout makes the installation more compact or in any case significantly optimizes the process. The proposed solution generates a system with one replacement for stands of a reversing rolling mill and, therefore, a more compact rolling mill workshop, reduced and optimized use of bridge cranes, more rational use of spare parts and therefore better management in the warehouse. This, of course, leads to fewer maintenance personnel and a shorter time to replace the parts of the rolling mill (for 4 stands located next to each other there is the possibility of the presence of only one operator).

In addition, the management of the warehouse and the movement of the stands, provided through the rational use of spare stands, also provides the ability to remotely locate the mill roll processing workshop in other places without jeopardizing the work and therefore the productivity of the rolling mill.

The “Form I" solution shown in FIG. 2 results in a more compact layout and enables the use of shorter roller bearings, grease pipes, hydraulic pipes, air pipes, water pipes and lubricants, which reduces the impact on parts of operations and maintenance.

In this embodiment, the furnace module 21 with associated accessories (such as a descaler 23) is located immediately in front of the roughing module 24. After it follows a rolling mill 10 in accordance with the invention in front of the refrigerator 27, the nodes 29 slicing and end nodes.

Exactly the same, with the exception of the layout, the solution in the “U shape” shown in FIG. 3 with a refrigerator 27 located even further (due to the fact that, in accordance with the need to place the laying equipment, strapping equipment and sorting equipment for the final product) leads in any case, after improving the finishing stand, to a more compact layout. In any case, the compact solution can provide the possibility of using the space after the finishing stand in such a way that it is optimized, and the distance between it and the refrigerator can be increased at low cost, which allows rolling the longer end product from the initial profile, which is made heavier, and cutting it into many lengths of the refrigerator, in front of the refrigerator using a saw. This, of course, improves productivity and production output, as well as plant productivity at a lower investment cost.

FIG. 4 shows a third embodiment of a plant that includes a rolling mill in accordance with this invention and which combines the characteristics of a plant in “Form I” and a plant in “Form U” shown above as a result of mixing and adaptation.

In general, we can talk about the following advantages of the invention compared to installing SMS:

- advantages due to the reduction in the number of replacements in the finishing stand, as a result of which fewer plant stops are required and therefore greater productivity is provided;

- in addition, fewer replacements reduce the time and cost of preparing the finishing stand in the workshop;

- the service life of the finishing stream is optimized, which in the proposed solution fulfills only the function of final processing, and not the compression function, and also allows to reduce investment costs for many rolls;

- the solution with 4 stands provides flexibility during rolling and the possibility of using both passes through the compression stands for each sequence, which allows to increase the productivity of the installation;

- The best tolerances for the final product, as the finishing stand has a dedicated creek, which wears out to a lesser extent over time.

And the following advantages compared to the previous module (3 + 1) with a separate finishing stand, that is:

- reduction of the spaces required for the production of the profile;

- less energy consumption for the final bar, immediately after roughing, without additional temperature loss.

The above description with reference to the drawings clearly shows how a compact reversible universal rolling mill for the production of medium-large profiles in accordance with the invention, in particular, is useful and preferred. Thus, the goal presented in the introductory part of the description is achieved.

Naturally, the shapes of the compact reversible universal rolling mill for the production of medium-large profiles in accordance with the invention may differ from that presented here solely as a non-limiting example in the drawings, and the materials used may also be different.

The scope of protection of the invention is therefore defined by the appended claims.

Claims (10)

1. A compact reversible universal rolling mill for the production of medium-large profiles, containing at least one first universal crimp stand (14), a two-roll stand (15) and a second universal crimp stand (16) to form a reversible intermediate module (12) through the roller bearings (13), along which the machined block (17) is transferred, characterized in that immediately after the said reversible intermediate module (12) a universal finishing stand (11) is provided as an additional final stand stand also situated transversely to the common roller bearing (13), said finishing mill (11) is maintained open during the intermediate passages cycle and only closes before the bar (17) finishes the last pass of the production cycle. 2. A compact reversible universal rolling mill for the production of medium-large profiles, containing at least a first universal crimp stand (14), a two-roll stand (15) and a second universal crimp stand (16) to form a reversible intermediate module (12) through roller bearings (13), along which the processed block (17) moves, characterized in that immediately after the said reversible intermediate module (12) a finishing universal stand (11) is provided as the final additional fly moving perpendicularly in accordance with the arrow F with respect to said roller bearings (13), said finishing stand (11) being kept closed at a distance from said roller bearings (13) during intermediate cycle passes and only moved to said roller bearings (13) before the bar (17) finishes the last pass of the production cycle. 3. A method of manufacturing medium-large profiles in a reversible universal rolling mill, comprising rolling a bar (17) in a rolling mill containing at least one first universal crimp stand (14), a two-roll stand (15) and a second crimp universal stand ( 16), forming a reversible intermediate module (12), and roller bearings (13), along which the processed bar (17) moves, and immediately after the said reversible intermediate module (12), rolling is performed using a universal of the stand (11) as the final additional stand, where the finishing stand (11) is kept open during intermediate passes of the cycle, the finishing stand (11) is closed only before the bar (17) finishes the last pass of the production cycle. 4. A method of manufacturing medium-large profiles in a reversible universal rolling mill, comprising rolling a bar (17) in a rolling mill containing at least one universal crimping stand (14), a two-roll stand (15) and a second crimping universal stand (16 ), forming a reversible intermediate module (12), and roller bearings (13), along which the processed block (17) moves, immediately after the said reversible intermediate module (12), they are rolled using a finishing universal stand (11) in As a final additional stand, which is arranged to move perpendicularly in accordance with arrow F with respect to said roller bearings (13), said finishing stand (11) being kept closed at a distance from said roller bearings (13) during intermediate cycle passes and moving it to said roller bearings (13) only before the bar (17) finishes the last pass of the production cycle. 5. Installation for the production of medium-large profiles, containing a module (21) of the furnace with the appropriate accessories (23) in front of the roughing module (24), a refrigerator (27), a cutting unit (29) and finishing stands, in which between the said module ( 24) roughing and the mentioned refrigerator (27) provides a compact reversible universal rolling mill (10) according to p. 1. 6. Installation according to claim 5, characterized in that said refrigerator (27) is located immediately after said compact reversible universal rolling mill (10). 7. Installation according to claim 5, characterized in that said refrigerator (27) is placed separately from and after said compact reversible universal rolling mill (10). 8. Installation for the production of medium-large profiles, containing a module (21) of the furnace with appropriate accessories (23) in front of the roughing module (24), a refrigerator (27), a cutting unit (29) and a finishing stand, in which between the said module ( 24) roughing and the mentioned refrigerator (27) provides a compact reversible universal rolling mill (10) according to claim 2. 9. Installation according to claim 8, characterized in that said refrigerator (27) is located immediately after said compact reversible universal rolling mill (10). 10. Installation according to claim 8, characterized in that said refrigerator (27) is placed separately from and after said compact reversible universal rolling mill (10).

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