RU2302913C2 - Heated billet continuous hot rolling process for receiving large number of final blanks of articles - Google Patents

Abstract

FIELD: continuous hot rolling process including stages of slitting rolled piece for producing rods and strips.

SUBSTANCE: it is possible to provide enlarged range of types and dimensions by continuous rolling of billet for producing first rolled piece having at least first and second segments mutually joined through intermediate bridge while surface area of second segment exceeds that of first segment; by cutting bridge for dividing first and second segments and simultaneously rolling divided segments for producing articles with different cross section surface areas. It is possible to roll first and second segments for producing second rolled piece having third segments with similar surface areas of its cross section mutually joined through second intermediate bridge. Second intermediate bridge is cut for dividing third segments then subjected to rolling for producing ready articles. First and second segments may be rolled in separate second and third rolling lines.

EFFECT: enhanced efficiency of rolling mill.

3 cl, 6 dwg

Description

Cross reference to related applications

This application claims the priority of the provisional application, registration number 60/592201, filed July 29, 2004.

State of the art

1. The technical field to which the invention relates.

The present invention relates to continuous hot rolling of heated billets, which are longitudinally cut during processing to produce finished products, such as strips and rods.

2. Description of the Related Art

In a conventional continuous rolling mill, an example of the rolling scheme of which is shown in Figure 1, a typical billet 10 is first heated to a temperature of about 1050-1150 ° C. The billet is then sequentially rolled on rolling mills 1V-12H / V installed along the rolling line P1 to obtain a first rolling 12. As shown in FIG. 2A, the first rolling 12 has transversely spaced segments 14 with equal cross-sectional area, connected by an intermediate first jumper 16.

As again shown in FIG. 1, at position 18, the first jumper 16 is cut to separate the segments 14, which are then routed to separate rolling lines P ₂ , to continue rolling to obtain a second rolling 20 on the rolling mills 13H-16H / V. As shown in figure 2B, each of the second rentals has transversely spaced segments 22 with equal cross-sectional area, connected by an intermediate second jumper 24.

At position 26, as shown in FIG. 1, the second jumper 24 is cut to separate segments 22 and then these segments are sent to separate rolling lines P _3a- P _3d for rolling to produce end products 28 in some or all of the rolling mills 17-24 blocks "M" finishing.

Since the rolled products 12 and 20 are cut into segments having equal cross-sectional areas, identical cut segments 22 are fed into each of the final processing units. This significantly limits the range of products that can be obtained using a rolling mill with a given roll caliber and guide unit. As an illustration, suppose, for example, that the preform 10 at the inlet has dimensions 160 × 160 mm with a cross-sectional area of 26.322 mm ² , with the divided segments 14 and 22 each having a corresponding cross-sectional area of 32.4 mm ² and 15.6 mm ² .

As shown in FIG. 3, when using the finishing unit installed in the rolling line P _3a , as an example, the following rolling sequences are possible to obtain the following products:

ROLLING SEQUENCE FINAL SIZE (DIAMETER) 17-24 6.3 mm 17-22 8 mm 17-20 10 mm 17-18 12.5 mm

To obtain other products, the rolling mill should be stopped, while changing the configuration of the roll calibers and changing the guides.

The main objective of the present invention is to significantly expand the range of products that can be rolled simultaneously with a given configuration of the caliber of the rolls on a rolling mill that uses cutting of the product.

Another objective of the present invention is to provide the above expansion of the range of products while increasing the hourly productivity of the rolling mill.

SUMMARY OF THE INVENTION

In accordance with the present invention, the heated billet is first rolled to produce rolled products having at least transversely arranged first and second segments connected by an intermediate jumper, the cross-sectional area of the second segment being larger than the first segment. The jumper is then cut to separate the first and second segments. The first segment is then rolled to obtain an article in a first size range and simultaneously the second segment is rolled to an article in a second size range with a large article size.

Brief Description of the Drawings

The invention will be described in more detail below with reference to the accompanying drawings, in which:

figure 1 shows a diagram of a rolling mill using conventional technology, a longitudinal section;

Figures 2A and 2B show cross-sectional views of rolled products obtained using the rolling mill shown in Figure 1;

figure 3 shows a rolling diagram of one of the finished blocks shown in figure 1;

figure 4 shows a rolling scheme of a rolling mill that uses cutting technology in accordance with the present invention;

Figures 5A and 5B show a cross-sectional view of the steel obtained using the rolling mill of Figure 4; and

figure 6 shows a rolling diagram of one of the rolling lines shown in figure 4.

DETAILED DESCRIPTION OF THE INVENTION

In accordance with the present invention and as shown in FIG. 4, a heated billet 10 of the type described above is rolled using a sequence of rolling mills 1V-12H / V installed along the rolling line P1 to produce the first rolled 30. However, as shown in FIG. 5A, in contrast from the previously described rental 12, in which segments 14 with an equal cross-sectional area are obtained, the rental 30 has first and second segments 32, 34 with an unequal cross-sectional area, connected by an intermediate jumper 36.

At position 38 in figure 4, the jumper 36 is cut to separate segments 32, 34. The smaller segment 32 is sent to the rolling line P2, where it is rolled in rolling mills 13H-16H / V to obtain a second rolled 40. As shown in figure 5B, the second rolled 40 has a corresponding shape in which third segments 42 with equal cross-sectional area are connected by an intermediate second jumper 44. At position 46, the jumper 44 is cut to separate the third segments 42. The third segments 42 are then routed to rolling lines P _3a and P _3b such as shown in phi Ur 1 for rolling to obtain final products 28.

While the third segments 42 are processed into final products 28, in rolling mill stands of the rolling lines P _3a , P _{3b, the} larger cut segment 34 is sent to a separate rolling line P ₄ for rolling to produce a wide range of end products 48.

And again, by way of illustration, suppose that the same preform 10 is used at the inlet, which has been described with reference to FIG. 1, with the first and second cut segments 32, 34 having corresponding cross-sectional areas of 30 mm ² and 40 mm ² and the third cut segments 42 have a cross-sectional area of 15.6 mm. With these sizes, the final products 28 obtained in the rolling lines P _3a , p _3b will be approximately the same as described above, namely, a round profile with a cross section with a diameter of 6.3, 8.0, 10.0 or 12.5 mm .

However, as shown in figure 6, the following sequence of rolling and final processing of products during rolling of a larger cut segment 34 in line P ₄ rolling:

ROLLING SEQUENCE FINAL PRODUCT SIZE (DIAMETER) 13-22 12.0 mm 13-20 16.0 mm 13-18 20.0 mm 13-16 25.0 mm 13-14 32.0 mm 13-22 14.0 mm 13-20 18.0 mm 13-18 22.0 mm 13-16 28.0 mm

Thus, it can be seen that due to the initial rolling and cutting of the heated billet 10 to obtain separated segments 32, 34 with an unequal cross-sectional area, these segments can then be further processed to obtain the final product with different size ranges. This improved flexibility is provided without the need to turn off the rolling mill to change the configuration of the rolling sequence and replace the guides.

The larger segment 34 of the rolled 30 also allows you to increase the feed rate of the workpieces, which preferably increases the volume of production in tons per hour of operation of the rolling mill.

In view of the foregoing, it should be understood that the types of rolled products and rolling patterns described above are merely examples of what can be used in accordance with the present invention, the basic concept of which is to cut the rolled products into at least two segments with an unequal cross-sectional area, then perform simultaneous rolling of such cut segments to obtain final products with different size ranges.

Claims (3)

1. A method of continuously rolling a billet to produce end products with different sizes, comprising rolling the billet to produce a first roll having at least a first and a second segment connected by an intermediate jumper, wherein the cross-sectional area of the second segment is larger than the cross-sectional area of the first segment, cutting the jumper to separate the first and second segments and simultaneously rolling the first and second segments separated in this way to obtain final products having times th cross-sectional area. 2. The method according to claim 1, in which one of these segments, the first and second, is rolled to obtain a second rental having third segments with an equal cross-sectional area connected by a second intermediate bridge, the second intermediate bridge is cut to separate the third segments and rolled divided Thus, the third segments with the receipt of the final product. 3. The method according to claim 1, in which the billet is rolled to obtain the first rental in the first rolling line and in which the separated first and second segments are rolled simultaneously with the receipt of the final products on separate second and third rolling lines.

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