EP0597093B1 - Method of manufacturing metal bars and apparatus therefor - Google Patents

Method of manufacturing metal bars and apparatus therefor Download PDF

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Publication number
EP0597093B1
EP0597093B1 EP91916223A EP91916223A EP0597093B1 EP 0597093 B1 EP0597093 B1 EP 0597093B1 EP 91916223 A EP91916223 A EP 91916223A EP 91916223 A EP91916223 A EP 91916223A EP 0597093 B1 EP0597093 B1 EP 0597093B1
Authority
EP
European Patent Office
Prior art keywords
strands
pair
rolling
slit rolls
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.)
Revoked
Application number
EP91916223A
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German (de)
English (en)
French (fr)
Other versions
EP0597093A1 (en
EP0597093A4 (en
Inventor
Giichi Matsuo
Akira Sakai
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Publication of EP0597093A4 publication Critical patent/EP0597093A4/en
Publication of EP0597093A1 publication Critical patent/EP0597093A1/en
Application granted granted Critical
Publication of EP0597093B1 publication Critical patent/EP0597093B1/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • B21B1/0815—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 from flat-rolled products, e.g. by longitudinal shearing

Definitions

  • the present invention relates to methods and apparatuses for producing metal bars wherein at least four strands of metal bars, particularly steel bars, are obtained by simultaneously rolling from a single billet.
  • a steel bar of 9 to 20 mm in diameter as a concrete bar for reinforcing concrete is produced in large quantities.
  • the bar includes not only a bar whose cross section is substantially round, but also a bar whose cross section is slightly oval or square-shaped and a ribbed bar which is the above-mentioned bar, on which ribs are formed.
  • Said bars are produced by a bar rolling mill generally having 16 to 20 stands in the following manner:
  • the bar rolling mill is roughly composed of a roughing rolling train and a finishing rolling train.
  • a preformed billet is produced by rolling a billet of 100 to 150 mm in diameter and thus reducing a cross-sectional area of the billet to 70 to 95 % thereof.
  • a final product is obtained by rolling said preformed billet in the finishing rolling train.
  • the method wherein a strand of metal bar is produced from a single billet in this way is popular. However, such a method is not effective in productivity of the bars.
  • FIG. 10(A) Four strands 4a, 4b, 4c and 4d connected to each other by thin connecting portions 4e, 4f and 4g are formed as shown in Figure 10(A) by means of stands K 4 and k 3 .
  • the four strands 4a, 4b, 4c and 4d as shown in Figure 10(B) are cut off along the central connecting portion 4f by means of a first pair of slit rolls (6) between stands K 3 and K 2 as shown in Figure 11.
  • four bars 4a, 4b, 4c and 4d as shown in Figure 10(C) are obtained by cutting off along the connecting portions (4e, 4g) by means of two pairs of second slit rolls (7, 8).
  • bars 5a, 5b, 5c and 5d as final products are produced by simultaneously rolling the four bars 4a, 4b, 4c and 4d. Processes of rolling and cutting the strands are shown in Figures 10(A) to 10(D) and the positions of the slit rolls on the plane are shown in Figure 11.
  • the present invention provides a method for producing metal bars, which solves said problems and is further improved, and it is an object of the present invention to provide a method for simultaneously producing at least four metal bars and an apparatus therefor.
  • the present invention proposes a new construction of a finishing rolling train and a new rolling method for producing metal bars wherein the conventional roughing rolling train is used.
  • the stands of a finishing rolling train are stands K 4 , K 3 , K 2 and K 1 arranged in series in the rolling direction.
  • Figure 1 is a top plan view showing an arrangement of the finishing rolling train of an apparatus for producing metal bars by the present invention.
  • Figures 2(A) to 2(G) are explanatory views showing the roll calibers of each stand in the finishing rolling train as shown in Figure 1.
  • Figure 3 is a top plan view of an arrangement of the first and the second slit rolls placed just behind a stand K 3 .
  • Figure 4 is an explanatory view showing a caliber of the first pair of slit rolls.
  • Figure 5 is an explanatory view showing a caliber of the second pair of slit roll.
  • Figure 6 is an explanatory view showing the slit roll guide composed of the first pair of slit rolls and the second pair of slit rolls as shown in Figures 3 to 5.
  • Figures 7(A) to 7(H) are explanatory views showing the processes of deformation of the strands by roll calibers from the roll stands K 5 to K 1 in the case of simultaneously rolling five strands of bars.
  • Figures 8(A) to 8(I) are explanatory views showing the processes of deformation of the strands by roll calibers from the roll stands K 5 to K 1 in the case of simultaneously rolling six strands of bars.
  • FIGS 9(A) to 9(C) are explanatory views showing the processes of rolling in the "Prior Art 1".
  • FIGS 10(A) to 10(D) are explanatory views showing the processes of rolling in the "Prior Art 2".
  • Figure 11 is an explanatory view showing an arrangement pairs of slit rolls in the "Prior Art 2".
  • reference numeral 9 denotes a final stand K 5 in a roughing rolling train.
  • the final stand has a pair of vertical rolls (hereafter referred to as "V roll") and finally controls the shape of a preformed billet supplied to the next stand K 4 .
  • Reference numeral 11 denotes a stand K 4 , 13 a stand K 3 16 a first pair of slit rolls, 17 a second pair of slit rolls, 18 a stand K 2 and 20 a stand K 1 .
  • An ordinary roughing rolling train (not shown) is arranged before the stand K 5 .
  • a finishing billet yard is laid out, which includes cutting devices and cooling beds. Roll calibers arranged in the stands as shown in Figure 1 and a process of deformation of strands are described with specific reference to Figure 2.
  • Figure 2(A) shows a shape of a roll caliber of said stand K 5 and a shape of a preformed billet 10.
  • the stand K 5 provides a shape of the preformed billet 10 by means of a pair of V rolls required for rolling in the stand K 4 .
  • FIG 2(B) shows an oval caliber rolls 11 and the strands divided into four in the case of simultaneously rolling four strands.
  • the caliber roll 11 has three convex portions 11a, 11b and 11c as shown in Figure 2(B) and divides the preformed billet 10 into four strands 12a through 12d having a substantially equal cross sectional area.
  • the depth of the convex portions is from 1 to 4 mm, and the four strands are sufficiently connected to each other with shallow cleavages.
  • the depth of the cleavages is from 10 to 20 % of the thickness of the strand 12.
  • the four strands divided are substantially square-shaped or oval in shape.
  • Figure 2(C) shows that the connected four strands are further rolled by the stand K 3 .
  • Both the outer roll calibers 13a and 13d are of oval shape or box-shaped and the roll calibers 13b and 13c at the intermediate portion are diamond-shaped in principle. Accordingly, both the outer strands 14a and 14d are box-shaped and the two strands 14b and 14c at the intermediate portion are diamond-shaped.
  • the four strands are connected to each other by means of thin connecting portions (hereinafter referred to as the "connecting portion") 14e through 14g.
  • Figure 2(D) shows that the connecting portions 14e and 14g of the connecting portions are cut by means of a first pair of slit rolls.
  • Figure 2(E) shows the four strands 14a through 14d after the center connecting portion 14f has been cut by means of a second pair of slit rolls.
  • Figure 2(F) shows roll calibers 18a through 18d and strands 19a through 19d in the stand K 2 .
  • the stand K 2 has oval roll calibers so that the four strands as shown in Figure 2(E) are rolled to be adapted to the final rolling, whereby four strands 19a to 19d of oval shape are formed.
  • Figure 2(G) shows roll calibers 20a through 20d on the stand K 1 for carrying out the final rolling.
  • the roll caliber is a round caliber.
  • the roll calibers in the stand K 1 are required to have the shape of the final product.
  • the roll caliber should be a caliber which gives ribs on the bars.
  • Approximate dimensions of the preformed billet are shown to show specific examples of the present invention.
  • a square billet of 150 mm in each side was rolled by means of a roughing rolling train.
  • a preformed billet 10 obtained in the final stand K 5 had a box-shape with a breadth of 41.24 mm and a thickness of 13.48 mm and the central portion of the preformed billet was swelling. Accordingly, the roll calibers also were box-shaped.
  • a roll caliber in the stand K 4 had a breadth of approximately 48.1 mm and had an oval shape as a whole, the maximum thickness of which was about 10.5 mm.
  • the roll caliber had convex portions 11a through 11c at positions where the roll caliber was divided into about four equal portions.
  • the breadth of each of the divided strands was from 11.5 to 12.5 mm.
  • Each of both the outer roll calibers 13a and 13d in the stand K 3 had a breadth of about 7.9 mm and a thickness of 9.5 mm and had an oval shape.
  • Diamond-shaped roll calibers 13b and 13c at the intermediate portion had a breadth of about 11.4 mm and a thickness of 12 mm.
  • the connecting portions had a breadth of about 0.8 mm and a thickness of 1 mm or less.
  • Roll calibers 18a through 18d in the stand K 2 had a breadth of 17.8 mm and a thickness of 6.6 mm and were flat oval-shaped.
  • Roll calibers 20a through 20d in the stand K 1 were round calibers of about 8.9 mm in diameter. In consequence, a bar of about 8.8 mm in diameter as a final product could be produced.
  • Figure 3 is a top plan view showing an arrangement of a first pair of slit rolls 16 and a second pair of slit rolls 17 placed just behind a stand K 3 .
  • Reference numerals 16c, 16d and 17b denote guides for controlling the directions of movement of cut strands.
  • the strands 14a through 14d are cut off as shown in Figure 4.
  • the present invention is characterized in that connecting portions of two strands 14a and 14d on the outer sides out of divided four strands 14a through 14d are cut off by means of two edges 16a and 16b of a first pair of slit rolls 16.
  • the important points in the shape of the two edges 16a and 16b consist in that the edges are formed so that the cut strands 14a and 14d can be directed outwardly, as shown by the arrows in Figure 3.
  • the two central strands 14b and 14c are cut off along the connecting portion 14f by means of the edge 17a of the second pair of slit rolls 17 as shown in Figure 5.
  • the angle of the edge 17a of the second pair of slit rolls is formed so that the cut strand can be directed outwardly.
  • the present invention includes the feature that initially both the outer strands are cut off and then two inside strands are sequentially cut off, in contrast to the Prior Art 2.
  • a method is adopted wherein the strands are sequentially cut off from both the outer strands to the central portion thereof.
  • This method has an advantage in that the position of the second pair of slit rolls 17 can be fixed in relation to the position of the first pair of slit rolls 16 independent of the rolling speed of the strands and that the cutting of the strands can be performed to change of the rolling speed and the like.
  • the first pair of slit rolls 16 and the second pair of slit rolls 17 are accommodated into a housing 22.
  • Reference numeral 23 denotes a guide for leading cut strands.
  • the device as a whole is referred to as a slit roll guide.
  • Figure 7 shows an embodiment wherein five bars are simultaneously produced.
  • Figure 8 shows an embodiment wherein six bars are simultaneously produced.
  • the method for simultaneously producing five bars or six bars is quite the same as the method for simultaneously producing four bars. However, additional explanation is given below as follows:
  • Figure 7(A) shows a roll caliber 9a in a stand K 5 and a preformed billet 10.
  • Figure 7(B) shows a process in which five strands 25a through 25e, each having equal cross sectional area, are rolled by means of a pair of rolls 24 in the stand K 4 .
  • Figure 7(C) shows a process in which both the outer strands 27a and 27e are rolled to form strands of oval shape or of a box-shape, and intermediate three strands 27b through 27d are rolled to form strands of a diamond shape or oval shape which is longer in vertical directions, by means of a pair of rolls 26 in the stand K 3 .
  • Figure 7(D) shows a process in which both the outer two strands 27a and 27e are cut off by means of two edges 28a and 28b of the first pair of slit rolls 28.
  • Figure 7(E) shows a process in which connected three strands 27b, 27c and 27d are cut off by means of the second pair of slip rolls 29 having two edges 29a and 29b along the connecting portions 27g and 27h.
  • Figures 7(F) to 7(H) show a process in which the cut strands 27a through 27e are rolled on the stands K 2 and K 1 .
  • Figures 8(A) to 8(I) show roll calibers and deformation of the strands when six bars are simultaneously produced.
  • Figure 8(A) shows the deformation of the billet in the stand K 5
  • Figure 8(B) shows the deformation of the strands in the stand K 4
  • Figure 8(C) shows the deformation of the strands in the stand K 3 .
  • Figure 8(D) shows a cutting procedure of the strands by means of the first pair of slit rolls 38.
  • Figure 8(E) shows a cutting procedure of the strands by means of the second pair of slit rolls 39.
  • Figure 8(F) shows a cutting procedure of the strands by means of the third pair slit rolls 40.
  • N the number of bars to be simultaneously produced is N (N ⁇ 4)
  • 1/2 x N pairs of slit rolls are provided in the slit roll guide when N is an even number.
  • N is an odd number
  • 1/2 x (N - 1) pairs of slit rolls are provided in the slit roll guide.
  • Figure 8(H) shows a rolling process at the stand K 2 .
  • Figure 8(I) shows a rolling process at the stand K 1 .
  • the present invention is intended to simultaneously roll mainly four steel bars or more. It is clear that the present invention can be applied to the production of aluminium bars, copper bars and other metal bars in general.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Shearing Machines (AREA)
  • Wire Processing (AREA)
EP91916223A 1990-08-20 1991-09-21 Method of manufacturing metal bars and apparatus therefor Revoked EP0597093B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2218329A JP2590598B2 (ja) 1990-08-20 1990-08-20 １つのビレットから少なくとも４本の金属丸棒を同時に製造するための方法および装置
CA002071545A CA2071545C (en) 1990-08-20 1991-09-21 Method and apparatus for producing metal bars
PCT/JP1991/001263 WO1993005897A1 (fr) 1990-08-20 1991-09-21 Procede de fabrication de barres metalliques et appareil associe

Publications (3)

Publication Number Publication Date
EP0597093A4 EP0597093A4 (en) 1994-03-24
EP0597093A1 EP0597093A1 (en) 1994-05-18
EP0597093B1 true EP0597093B1 (en) 1997-12-10

Family

ID=27169105

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91916223A Revoked EP0597093B1 (en) 1990-08-20 1991-09-21 Method of manufacturing metal bars and apparatus therefor

Country Status (6)

Country Link
EP (1) EP0597093B1 (ja)
JP (1) JP2590598B2 (ja)
CA (1) CA2071545C (ja)
DE (1) DE69128432T2 (ja)
ES (1) ES2111575T3 (ja)
WO (1) WO1993005897A1 (ja)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2630067B2 (ja) * 1991-09-21 1997-07-16 日本鋼管株式会社 金属棒材の製造方法および装置
AU3064092A (en) * 1991-11-04 1993-06-07 Structural Metals, Inc. Method and apparatus for simultaneously forming four metal rounds
IT1260567B (it) * 1992-06-30 1996-04-16 Danieli Off Mecc Procedimento per ottenere a caldo profili tondi singoli da elementi unici multiprofilo caldi e relativo dispositivo
US5626044A (en) * 1995-05-19 1997-05-06 Lara-Castro; Manuel Method of producing steel bars from billets
RU2302913C2 (ru) * 2004-07-29 2007-07-20 Морган Констракшн Компани Способ непрерывной горячей прокатки нагретой заготовки с получением множества законченных заготовок изделий
US7191628B2 (en) 2004-07-29 2007-03-20 Morgan Construction Company Method of continuously hot rolling a heated billet into a plurality of finished products
CN105032936B (zh) * 2015-06-29 2017-11-07 四川省达州钢铁集团有限责任公司 一种切分轧制工艺
CN110280591B (zh) * 2019-06-26 2020-09-11 安阳钢铁股份有限公司 一种棒材生产控轧工艺的多线切分轧制中线处理方法
CN112404131A (zh) * 2020-10-30 2021-02-26 张家港宏昌钢板有限公司 一种控制螺纹钢切分道次条形均匀性的方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE341049C (ja) *
FR956169A (ja) * 1939-06-18 1950-01-26
JPS6018241B2 (ja) * 1979-12-07 1985-05-09 新日本製鐵株式会社 スラブの幅多分割方法
JPS591001A (ja) * 1982-06-28 1984-01-06 Showa Kogyo Kk 棒鋼の多条圧延方法
JPS5924503A (ja) * 1982-07-31 1984-02-08 ストラクチュラル　メタルス，インコーポレーテッド ３つの均一な丸い金属棒を同時に圧延する方法とその装置
JPS6092001A (ja) * 1983-10-27 1985-05-23 Nippon Kokan Kk <Nkk> 多条素材の切り裂きによる条鋼の製造方法および多条素材の切り裂き装置

Also Published As

Publication number Publication date
DE69128432T2 (de) 1998-05-07
EP0597093A1 (en) 1994-05-18
CA2071545C (en) 1996-01-30
DE69128432D1 (de) 1998-01-22
CA2071545A1 (en) 1993-03-22
ES2111575T3 (es) 1998-03-16
JPH04100603A (ja) 1992-04-02
WO1993005897A1 (fr) 1993-04-01
EP0597093A4 (en) 1994-03-24
JP2590598B2 (ja) 1997-03-12

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