Method of producing metal beams with a top-hat profile

Abstract

A method for producing metal beams having a top-hat profile comprises the hot rolling of slabs (13), ingots (12), billets, preliminary profiles (14) or similar semifinished products in a rolling train. The rolling train comprises at least two roll stands. Using at least two shaping passes during a single rolling process in a number of rolling stations at hot-rolling temperature, preferably simple irregular pass design turns an entering cross section (10) of a one-part semifinished product into an exiting cross section having a top-hat profile (A), which corresponds geometrically more or less to the profile of the finished product.

Claims

1.-13. (canceled)

14. A method for producing metal beams having a top-hat profile (A), comprising: hot rolling semifinished products in a rolling train with at least two roll stands, wherein an exiting cross section having a top-hat profile is formed from an entering cross section of a one-part semifinished product using at least two shaping passes during a single rolling process in a plurality of rolling stations at hot-rolling temperature, and wherein the exiting cross section substantially corresponds geometrically to a profile of a finished product.

15. The method as in claim 14, wherein the semifinished products are slabs (13), ingots (12), billets, or preliminary profiles (14).

16. The method as in claim 14, wherein the at least two shaping passes have a simple irregular pass design.

17. The method according to claim 14, wherein the entering cross section of the one-part semifinished product has a rectangular cross section whose material distribution corresponds approximately to a material distribution to be produced with a first pass of the hot rolling.

18. The method according to claim 14, wherein the entering cross section of the one-part semifinished product is formed into the exiting cross section using seven to thirteen shaping passes.

19. The method according to claim 18, wherein the hot rolling is at least partly carried out with duo roll stands.

20. The method according to claim 14, wherein the hot rolling is carried out with an open arrangement of three to eight roll stands arranged side by side.

21. The method according to claim 20, wherein the hot rolling is carried out using four to eight roll stands arranged one behind the other.

22. The method according to claim 21, wherein the hot rolling is carried out using roughing roll stands and finishing roll stands in tandem arrangement, in a manner that is at least partially reversing.

23. The method according to claim 14, wherein the hot rolling is carried out using four to ten roll stands arranged one behind the other, comprising roughing roll stands, finishing roll stands in tandem arrangement operated in reversing mode, and finishing roll stands operated in continuous mode.

24. The method according to claim 14, wherein the hot rolling is carried out using seven to eighteen roll stands using roughing roll stands and/or roll stands in tandem arrangement, which are operated in reversing mode, and finishing roll stands, which are operated continuously.

25. The method according to claim 14, wherein the hot rolling is carried out completely continuously using seven to twenty roll stands arranged one behind the other.

26. The method according to claim 14, wherein the hot rolling is carried out using duo roll stands and/or universal roll stands.

27. The method according to claim 14, wherein, after a last forming pass (10) of the hot rolling, an inclination of flanges of the top-hat profile (A) is between 0.1 and 15 degrees relative to a perpendicular to an axis of symmetry of the top-hat profile.

28. The method according to claim 14, wherein the hot rolling is followed by a bending process with a straightening machine or a bending device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The invention is explained below with reference to a forming process illustrated in the drawing. The drawing shows alternative semifinished products and profiles after successive forming passes.

DETAILED DESCRIPTION

[0029] The entering cross section of the semifinished product to be hot-rolled is designated by reference numeral 10. This entry cross section 10 is rectangular and has a material distribution that roughly corresponds to the material distribution of the first forming pass. The semifinished product to be formed is, for example, a block 11 (bloom) with rectangular dimensions between 400 mm and 700 mm×150 to 450 mm, which is formed into the top-hat profile designated with reference character A using ten successive forming passes. The successive forming passes of the calibration for producing the top-hat profile are designated with reference numerals 1 to 10. Reference characters H to A thereby designate the successively generated profiles. For this purpose, in the exemplary embodiment described, ten shaping passes are required, which passes can be carried out, for example, in ten duo roll stands arranged one behind the other. As can be readily seen from the finished top-hat profile A after the forming pass 10, it still exhibits slight angular deviations from a strictly rectangular geometry. The finished top-hat profile A is, for example, the top-hat profile of a center longitudinal beam. The angular deviations after the last forming pass 10 are eliminated by a bending operation, for example by means of a straightening machine or by means of an additional universal roll stand after the last forming pass. In the illustrated exemplary embodiment, the inclination of the flanges 12 of the top-hat profile A relative to a horizontal line is approximately between 0.1 and 15 degrees.

[0030] Alternatively, the primary material for the forming process or the semifinished product to be formed, as the case may be, can be the slab 13 also shown in the drawing with rectangular dimensions between 500 mm and 1200 mm×150 mm to 450 mm or the preliminary profile 14 with dimensions between 400 mm and 750 mm×400 mm to 500 mm.

LIST OF REFERENCE SIGNS

[0031] 1-10 Forming passes

[0032] H to A Profiles

[0033] 11 Entering cross section

[0034] 12 Block (bloom)

[0035] 13 Slab

[0036] 14 Preliminary profile (beam blank)