EP0760263B1 - Method of and apparatus for hot rolling h-steel - Google Patents

Method of and apparatus for hot rolling h-steel Download PDF

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Publication number
EP0760263B1
EP0760263B1 EP96906060A EP96906060A EP0760263B1 EP 0760263 B1 EP0760263 B1 EP 0760263B1 EP 96906060 A EP96906060 A EP 96906060A EP 96906060 A EP96906060 A EP 96906060A EP 0760263 B1 EP0760263 B1 EP 0760263B1
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EP
European Patent Office
Prior art keywords
mill
width
rolling
universal
horizontal rolls
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96906060A
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German (de)
English (en)
French (fr)
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EP0760263A4 (en
EP0760263A1 (en
Inventor
Hiroshi Shikano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
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Sumitomo Metal Industries Ltd
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Publication date
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Publication of EP0760263A1 publication Critical patent/EP0760263A1/en
Publication of EP0760263A4 publication Critical patent/EP0760263A4/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
    • B21B1/088—H- or I-sections
    • B21B1/0886—H- or I-sections using variable-width rolls

Definitions

  • the present invention relates to a method of hot rolling H-shaped steel products for use in technical fields such as civil engineering and building construction, as well as to an apparatus for carrying out the method. More particularly, the invention relates to a hot rolling method of H-shaped steel products and apparatuses therefor, in which rolling stands are compactly arranged in a limited space. According to the present invention, hot rolling can be carried out efficiently with a high yield, and it is possible to reduce the number of inventory rolls.
  • Tandem rolling is a method of rolling with a plurality of rolling stands arranged in series in close proximity to each other.
  • a universal roughing mill (UR) and an edging mill (E) were arranged in tandem, but a universal finishing mill (UF) was provided independently remote from these mills.
  • UR universal roughing mill
  • E edging mill
  • UF universal finishing mill
  • the UF mill In order to shorten such a long-extended line of rolling stands for H-shaped steel products, it has been proposed that the UF mill also be arranged in tandem, i.e., the line of rolling stands of UR-E-UF in which each of the rolling stands is arranged closely to each other has been proposed. See Japan Patent Publication No.57-4401/1982. However, this is substantially the same as the prior art so long as the rolling operations are concerned, since the UF mill is off-duty while usual shape rolling with a reduction in thickness is carried out, and just the last finish pass is carried out through the line of UR-E-UF. The difference from the before-mentioned rolling line is that the UF is placed close to the E in the proposed one, but the UF is placed remote from the E in the conventional one.
  • the UF mill is not used during the usual shape rolling, an increase in operation costs is unavoidable since the UF mill suffers from wear and thermal affects of the lower rolls when the rolling material passes through the rolling stand.
  • Japanese Patent Publication No.6-83845/1994 discloses a method of rolling shaped steels using three mills, such as UR, E, and UF mills, which are installed close to each other in series, the work rolls of the UR mill comprising an X-shaped caliber, i.e., vertical rolls have a double-conical shape in section, and the UF mill comprising an H-shaped caliber, i.e., the vertical rolls are flat rolls.
  • the method comprises carrying out forward and reverse rolling of shaped-steels in a tandem roll arrangement using these three mills and finishing the shaped steels with the H-shaped caliber in the final pass through the UF mill.
  • Figure 1 shows an example of the roll pass design which is employed in the above rolling method employing X caliber + X caliber + H caliber.
  • the H-shaped steel piece 1 is subjected to reverse rolling, i.e., UR- E - UF, and then UF - E - UR.
  • Angles ⁇ R , ⁇ E , and ⁇ F are tilting angles, i.e., open angles of flanges of H-shaped steel products of horizontal rolls 10, 12, and 14, respectively, for the UR, E, and UF mills.
  • Reference figures 16 and 18 indicate vertical rolls of UR and UF mills, respectively.
  • the angle ⁇ R is adjusted to be about 5 - 10° for the universal roughing mill (UR), and the angle ⁇ E is adjusted to be ⁇ E ⁇ ⁇ R .
  • the universal finishing mill (UF) is provided with an H-caliber and the angle ⁇ F is nearly equal to zero ( ⁇ F ⁇ 0).
  • EP-A-0 736 341 which represents a state of art according to art.
  • 54(3) EPC discloses an intermediate rolling process using a universal roughing mill and a universal edging mill, the intermediate rolling process being followed by a universal finishing mill which can be disposed close to the edging mill in order to carry out an intermediate rolling using the finishing mill.
  • the width of the edging mill is adjusted to be smaller than the width of the horizontal roll of the universal roughing mill in order to reduce the height of the web through the final process.
  • the reference is silent about how to adjust the width of the horizontal rolls of the universal finishing mill.
  • Japan Kokai No. 4-258301/1992 discloses a rolling apparatus for shaped steels having parallel flanges, the apparatus comprising three mills, i.e., a universal roughing mill, an edging mill, and a universal finishing mill in a tandem line.
  • a universal roughing mill i.e., a universal roughing mill, an edging mill, and a universal finishing mill in a tandem line.
  • Either one of the horizontal rolls for the universal roughing mill and the universal finishing mill has a variable width, and the other one has a fixed-width.
  • the angle of the edge surfaces of the horizontal rolls is preferably 0°.
  • the web height of the shaped steels can be controlled by means of either one of the universal roughing mill and the universal finishing mill.
  • Figure 4 shows one example of the roll pass design of the above-described method of rolling, in which the UR, E, and UF mills are all provided with an H-caliber.
  • An H-shaped steel piece 1 is successively rolled through horizontal rolls 40, 42, 44 and vertical rolls 46, 48 for the UR, E, and UF mills, respectively.
  • the E and UF mills are provided with variable-width horizontal rolls, and the UF mill can expand or reduce the web height, as shown by the drawings labeled UF 1 and UF 2 , respectively.
  • Figures 5a and 5b show an example of the flange contacting troubles which occur in the above-mentioned rolling method.
  • Figure 5a illustrates an H-shaped steel piece which has just entered the UR mill
  • Figure 5b illustrates the H-shaped steel piece just before leaving the UR mill.
  • the UR mill comprises horizontal rolls 50 and vertical rolls 56, and the center of the UR mill and the center of the rolling material, i.e., the H-shaped steel piece 1 are separated by the distance ⁇ .
  • the horizontal rolls 50 therefore contact the top edges of the flanges in the area A.
  • the widths of the flanges are different from each other when leaving the UR mill, i.e., the width of flange 2a of H-shaped steel piece 1 is small, and the width of flange 2b is large.
  • An object of the present invention is to provide a method of hot rolling H-shaped steel products through a tandem rolling mill of UR-E-UF and an apparatus for carrying out the method, which can achieve the following advantages.
  • the inventor of the present invention carried out numerous rolling experiments including reverse rolling of beam blanks obtained by reverse breakdown rolling using UR-E-UF tandem rolling mills, as shown in Figure 6.
  • the mills comprised a universal roughing mill (UR), an edging mill (E), and a universal finishing mill (UF).
  • the horizontal roll of the UR was of the fixed-width type, that of the E was of the variable-width type, and that of the UF was of the variable-width type.
  • the inventor carried out rolling experiments on H-shaped steel piece 1 under hot rolling conditions, using a three-mill rolling line, as detailed in Figure 7, which comprised a universal roughing mill (UR), an edging mill (E), and a universal finishing mill (UF), in which the horizontal rolls of the E and UF mills were divided into two pieces and had a variable-width in the roll axis direction.
  • a three-mill rolling line as detailed in Figure 7, which comprised a universal roughing mill (UR), an edging mill (E), and a universal finishing mill (UF), in which the horizontal rolls of the E and UF mills were divided into two pieces and had a variable-width in the roll axis direction.
  • UR universal roughing mill
  • E edging mill
  • UF universal finishing mill
  • the horizontal rolls 76 of the edging mill (E) also had a taper at an angle ⁇ E in the barrel portion thereof.
  • the angle ⁇ E was the same as the angle ⁇ R .
  • the taper angle ⁇ F of the lateral surface of the horizontal rolls 78 of the universal finishing mill (UF) was adjusted to be approximately 0°.
  • the roll path design was X caliber ⁇ X caliber ⁇ H caliber.
  • the inventor obtained the following important findings. (1) According to an embodiment, if the inner web width of the rolling material is W E and the roll width of the variable-width horizontal rolls is W F , even if W F > W E , the rolling material smoothly enters the universal finishing mill, and there are no flaws or troubles when flanges are inserted into rolls.
  • Figure 8a illustrates an H-shaped steel piece 1 just before entering into the universal finishing mill (UF)
  • Figure 8b illustrates the H-shaped steel piece just after leaving the UF mill.
  • the distance ⁇ between the lateral surface of the variable-width horizontal roll 78 and each inner top edge of flanges 2 is, as shown in Figure 8a, preferably 3 - 4 mm or more.
  • the upper limit thereof varies depending on the flange width. When the flange width is 200 mm, for example, the distance may be 8 mm or less.
  • the inner web width of the rolling material is expanded from W E to W F , and simultaneously the taper angle of the flange 2 decreases from ⁇ E ( ⁇ ⁇ R ) to ⁇ F ( ⁇ 0°), as shown in Figure 7.
  • the inner web width of the rolling material after the universal finishing mill is W F and the roll width of the variable-width horizontal rolls of the edging mill is W E and if W E ⁇ W F , the rolling material smoothly enters the edging mill and there are no flaws or troubles when flanges are inserted into rolls.
  • Figure 9a illustrates an H-shaped steel piece 1 just before entering the edging mill (E)
  • Figure 9b illustrates the H-shaped steel piece just after leaving E.
  • the distance b between the lateral surface of the variable-width horizontal roll 76 and each inner top edge of flanges 2 is, as shown in Figure 9a, preferably 2 - 4 mm or more.
  • the upper limit thereof is preferably 15 mm.
  • the distance ⁇ is preferably within the range of 2 - 15 mm. More desirably, the distance is 8 mm or less.
  • W F and W E indicate the inner web widths of the H-shaped steel piece just after leaving the universal finishing mill and edging mill, respectively. These symbols sometimes indicate the widths of the variable-width horizontal rolls of these respective mills, too. Since the lengths of these widths are the same, respectively, the same symbols are used to describe these respective widths in this specification for the purposes of convenience.
  • Figure 6 illustrates an example of a production line for H-shaped steel products, which is an embodiment of the present invention. On the basis of this embodiment, the structure and effect of the present invention will be described in further detail.
  • Figure 7 illustrates pass designs of rolls installed on each of the universal roughing mill (UR), edging mill (E), and universal finishing mill (UF) in tandem rolling mills.
  • the E mill and UF mill have horizontal rolls each of which is divided into two pieces in the axial direction and has a width which can be varied.
  • the break-down rolling can be carried out in a conventional manner so as to prepare a rough-rolled workpiece from a starting material for intermediate rolling.
  • the resulting rolling material is then subjected to reverse rolling by a plurality of passes through three rolling mills arranged in tandem, which comprises the universal roughing mill, edging mill, and universal finishing mill in the arrangement of UR-E-UF.
  • the H-shaped steel stocks can be finished to final target sizes of flange width, inner web width, flange thickness, and web thickness by a final pass through the UF mill.
  • the width of a horizontal roll of each mill is adjusted such that the width W R of the horizontal rolls of the UR mill is equal to the inner web width of a final H-shaped steel product.
  • the present invention therefore, follows this general practice to determine the width W R . In fact, however, it is necessary to allow ⁇ 5 mm plus a width of product for wear of a roll.
  • the width W E of a barrel portion of each horizontal roll of the edging mill (E) is adjusted to be the same as the width W R
  • the width W F is adjusted to be several millimeters to ten some millimeters larger than the width W E . Namely, W F > W E ⁇ W R .
  • W F W R , i.e., a final inner web width is achieved.
  • the taper angle i.e., the slope angle of the lateral surfaces of horizontal rolls of each mill is adjusted such that the slope angle ⁇ R is 3° - 5° for the horizontal rolls 72 of the UR mill, the slope angle ⁇ E is equal to the slope angle ⁇ R for the horizontal rolls 76 of the E mill, and the slope angle ⁇ F is 0° - 0.5° for the horizontal rolls 78 of the UF mill.
  • the horizontal rolls 76 of the E mill have been described as being of the variable-width type, they may be of the fixed-width type. In such a case, it is generally desirable that the width W E of a barrel portion of the roll be equal to the width W R , and the width W E may be several millimeters smaller than the width W R .
  • reverse rolling can be carried out with these rolling mills which are arranged in tandem.
  • Figure 10 illustrates the course of deformation of a rolling material through the above-described rolling method of the present invention.
  • W R is the width of the horizontal rolls of the UR mill
  • W E is the width of barrel portions of the horizontal rolls of the E mill
  • W F is the width of the horizontal rolls of the UF mill. Since W F > W E , the inner web width is expanded at the UF mill. The passes going from the upstream side to the downstream side are called odd passes, and the reverse ones are called even passes.
  • the inner web width is expanded by a given amount (W F - W E ) at the UF mill, and in the course of the succeeding reverse rolling from the UF mill to the E mill, the rolling material is bit by rolls at the E mill as shown in Figures 9a and 9b. It is possible, therefore, to avoid problems when flanges are inserted into rolls and formation of rolling defects such as flaws on the inner surfaces of flanges.
  • the rolling material is finished by a final pass through the UF mill in which the width W F of the horizontal rolls 78 of the variable-width type is adjusted so as to obtain predetermined sizes of H-shaped steel products (web height, flange thickness, and flange width).
  • an H-shaped steel production line as shown in Figure 6 is used, in which each rolling mill is provided with rolls having a specific roll pass design as shown in Figure 7, and the width W R of horizontal rolls of the UR mill is adjusted to be substantially equal to the inner web width of the H-shaped steel product, as described with respect to the before-mentioned embodiment.
  • the width is also adjusted in an "on-line” manner to be W E ⁇ W F during rolling proceeding from the UF mill to the E mill.
  • the horizontal rolls of the E mill comprise a mechanism by which the width thereof can be varied in an "on-line" manner in a short period of time.
  • a mechanism is described in Japan Unexamined Laid-Open Specification No. 60-72603/1985, for example.
  • the taper angle ⁇ R of the horizontal rolls of the UR mill is adjusted to be 3° - 5°
  • the taper angle ⁇ F of the horizontal rolls of the UF mill is adjusted to be 0° - 0.5°.
  • Figure 11 illustrates the course of deformation of a rolling material through the above-described rolling method of the present invention.
  • the inner web width is equal to the width W F when the rolling material is introduced into the E mill, i.e., W F > W E , and the rolling material is bit by rolls at the E mill as shown in Figures 9a and 9b. It is possible, therefore, to avoid problems when flanges are inserted into rolls and formation of rolling defects such as flaws on the inner surfaces of flanges.
  • the rolling material is next finished by the final pass through the UF mill in which the width W F of the horizontal rolls of the variable-width type is adjusted so as to obtain predetermined sizes of H-shaped steel products (web height, flange thickness, and flange width).
  • width W E at the even pass means the width of barrel portions of the horizontal rolls of the E mill.
  • an H-shaped steel production line shown in Figure 6 is used to carry out reverse rolling in three rolling mills arranged in tandem as in UR-E-UF, in which each of the horizontal rolls of the universal roughing mill comprises two pieces divided in the widthwise direction and has a variable-width.
  • Figures 12a and 12b illustrate a layout of a rolling mill arrangement and roll pass design, respectively, in which the UR mill comprises three piece, variable-width horizontal rolls, the E mill comprises two-piece, variable-width horizontal rolls, and the UF mill comprises two-piece, variable-width horizontal rolls.
  • Table 1 below compares the prior art disclosed in Japan Patent Publication No. 6-83845/1994 and Japan Unexamined Laid-Open Specification No. 4-258301/1992 with the present invention with respect their structure and effect. As is apparent therefrom, the present invention exhibits marked synergistic effects over those of the prior art.
  • the size of the final product was H500 X 200 X 10/16 (mm), and the roll pass design was that shown in Figure 7, the dimensions of which were as follows:
  • the roll pass schedule was as shown in Table 2
  • the size of the final product was H500 X 200 X 10/16 (mm), and the roll pass design was that shown in Figure 7, the dimensions of which were as follows:
  • the roll pass schedule was as shown in Table 2 (starting rolling material: 700W X 300t, cc slabs)
  • the size of the final product was H500 X 200 X 10/16 (mm), and the roll pass design was that shown in Figure 12b, the dimensions of which were as follows:
  • the widths W R , W E , and W F were adjusted in an "on-line" manner so that the predetermined widths could be maintained even after wear of rolls took place.
  • the roll pass schedule was as shown in Table 2 (starting rolling material: 700W X 300t, cc slabs)
  • the present invention provides a rolling method which can avoid formation of flaws on the inner flange surfaces, as well as problems at the time of biting of flanges by rolls, i.e., prior art problems.
  • it is also possible to achieve highly efficient rolling of H-shaped steel pieces by means of reversible continuous rolling through three mills.
  • not only a finish universal rolling mill, but also a universal roughing mill have variable-width horizontal rolls, so it is possible to produce final products of the high quality with a high yield without the need for frequent roll exchanging which is usually required to make up for wear of rolls.
  • the present invention has great value from an industrial viewpoint.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP96906060A 1995-03-17 1996-03-15 Method of and apparatus for hot rolling h-steel Expired - Lifetime EP0760263B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP5910995 1995-03-17
JP59109/95 1995-03-17
JP5910995 1995-03-17
PCT/JP1996/000688 WO1996029160A1 (fr) 1995-03-17 1996-03-15 Procede et dispositif de laminage a chaud d'acier a profil en h

Publications (3)

Publication Number Publication Date
EP0760263A1 EP0760263A1 (en) 1997-03-05
EP0760263A4 EP0760263A4 (en) 1999-03-03
EP0760263B1 true EP0760263B1 (en) 2002-08-28

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Application Number Title Priority Date Filing Date
EP96906060A Expired - Lifetime EP0760263B1 (en) 1995-03-17 1996-03-15 Method of and apparatus for hot rolling h-steel

Country Status (5)

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EP (1) EP0760263B1 (ja)
AU (1) AU693326B2 (ja)
DE (1) DE69623208T2 (ja)
ES (1) ES2182966T3 (ja)
WO (1) WO1996029160A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19722732A1 (de) * 1997-05-30 1998-12-03 Schloemann Siemag Ag Verfahren zum Walzen von Stahlprofilen
CN105057345B (zh) * 2015-08-21 2017-03-22 天津市中重科技工程有限公司 一种万能轧机劈轧板坯生产h型钢的方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0763722B2 (ja) * 1985-05-17 1995-07-12 川崎製鉄株式会社 Ｈ形鋼の熱間圧延方法
DE3627729C2 (de) * 1986-08-16 1996-03-07 Schloemann Siemag Ag Formstahl-Walzwerk
JP2712846B2 (ja) * 1991-02-08 1998-02-16 住友金属工業株式会社 形鋼の圧延方法および圧延装置
JPH05115901A (ja) * 1991-10-29 1993-05-14 Kawasaki Steel Corp 形鋼のウエブ高さサイズフリー圧延方法
JPH05329521A (ja) * 1992-06-01 1993-12-14 Kawasaki Steel Corp Ｈ形鋼圧延方法
JP2943326B2 (ja) * 1993-12-20 1999-08-30 住友金属工業株式会社 Ｈ型鋼の製造方法

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Publication number Publication date
DE69623208T2 (de) 2003-04-17
EP0760263A4 (en) 1999-03-03
EP0760263A1 (en) 1997-03-05
AU693326B2 (en) 1998-06-25
ES2182966T3 (es) 2003-03-16
DE69623208D1 (de) 2002-10-02
AU4955796A (en) 1996-10-08
WO1996029160A1 (fr) 1996-09-26

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