US3597954A - Method and apparatus for rolling steel material and rails or similarly shaped products - Google Patents

Method and apparatus for rolling steel material and rails or similarly shaped products Download PDF

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Publication number
US3597954A
US3597954A US790766A US3597954DA US3597954A US 3597954 A US3597954 A US 3597954A US 790766 A US790766 A US 790766A US 3597954D A US3597954D A US 3597954DA US 3597954 A US3597954 A US 3597954A
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United States
Prior art keywords
vertical roll
rolling mill
rolling
universal rolling
curves
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Expired - Lifetime
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US790766A
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English (en)
Inventor
Koe Nakajima
Hisashi Naoi
Kanichi Kishikawa
Hidehiko Abe
Kazunari Tanaka
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Nippon Steel Corp
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Nippon Steel Corp
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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
    • B21B1/085—Rail sections

Definitions

  • ABSTRACT A method and apparatus for rolling steel material into steel products having flanges such as rails and l-l-shaped products by use of a universal rolling mill wherein the cross section along the direction of axis of the vertical roll of the universal rolling mill has a convex shape. Therefore, the rolling by such vertical roll gives a reduction of nearly V- shaped concentration to the part of the steel material contact ing said vertical roll and to be made into a flange.
  • FIG. I PRIOR ART 5 7 5 i f I E FIG. 2 PRIOR ART KOE NAKAJIMA, HISASHI NAOI,
  • FIG. 3A PRIOR ART tuvwxyz
  • FIG. 3B PRIOR ART" O b c d e 'FIG.;.4A m 45 KOE NAKAJIMA, HISASHI NAOI, KANICHI KISHIKAWA, [IIDEHIKO [ ⁇ BE' and I KAZUNARI TANAKA,
  • the present invention relates to a method and apparatus for rolling a steel material into rail or similarly shaped product such an H-shaped steel product or an l-shaped steel product by the universal rolling mill.
  • I-shaped steel products and T-shaped steel products by the conventional pass rolling methods becomes more difficult as the cross section ofsuch products becomes larger.
  • the rolling by such universal rolling mill has the merit of forming the head, particularly of a rail which requires forging to a great degree, concentrically by the vertical rolls. That is, the surface of the head of the rail which contacts wheels, is required to meet the most severe conditions, compared with the other parts, and therefore, the concentrated forging of the surface of the head of rail is an important factor for the prolongation of the life of the rail as well as for the prevention of breakage which might cause accidents.
  • the universal rolling mill can concentrically forge the head of rail, even such concentrated forging leaves certain parts unforged (hereafter referred to as the "unforged zone). This causes poor quality of product and the resulting complications, which constitutes an unavoidable problem in making rails and similarly shaped products by the universal rolling mill.
  • An object of the present invention is to provide a method and apparatus for rolling a steel material into steel products having flanges such as rails, H-shaped steel products and I-shpaed steel products by the universal rolling mill, without the formation of the unforged zone on the flanges of the products, such as the head of the rail.
  • the special characteristic of the present invention lies in the improvement of the method for rolling steel material into a shaped steel product having flanges such as a rail or an H- shaped steel product by the universal rolling mill and also the improvement of the universal rolling mill per se, whereby the cross section along the direction of the axis of the vertical roll of said universal rolling mill has a convex shape, Therefore, the rolling by said vertical roll gives a reduction of V-shaped concentration to the central part of the steel material contact ing said vertical roll.
  • FIG. 1 illustrates the rolling ofa rail according to the conventional method using the universal rolling mill
  • FIG. 2 illus trates the operation of edger rolls set before and behind the ing metal flow while rolling a roughly preformed steel piece of the same source as the piece of FIG. 3A, and FIG. 4B the condition of the metal after the rolling is finished
  • FIG. 5 illustrates the operation of the vertical rolls ofthe universal rolling mill on the head of rail according to the present invention
  • FIG. 6 illustrates the rolling according to the rolling method of FIG. 1
  • FIG. 7 exemplifies the modification of the rolling according to the present invention, showing the distribution of the same pressure when the vertical roll has only one convex part
  • FIG. 8 shows that at first stage, FIG. 9 that at the middle stage and FIG. 10 that at the last stage; and FIG. 11 is a sketch of the overall process according to the present invention.
  • FIGS. 1 and 2 illustrate the rolling ofa rail using the universal rolling mill, as carried out conventionally.
  • the to-be-rolled material is reduced in the thickness of the head 5, of the web 6 and of the foot 7.
  • the material passes through a predetermined space between the horizontal rolls 8 and 9 (the so-called edger rolls"); which passage is for the formation of the widths of the head and of the foot; the combination of the above rollings being carried out repeatedly until the desired sizes of the final product are obtained.
  • the rolling carried out by the conventional method is found to cause certain complications resulting in a poor quality product, which complications arise from the formation of an unforged zone in the surface ofthe head. This is due to the clinging ofthe object rolled by the hot rolling mill.
  • the unforged zone does not contribute to extension or deformation of the material, even though a great reduction overall is obtained by such method.
  • FIGS. 3A illustraterate the formation of the unforged zone, presenting theobservation of metal flow of product when rolled by the rolling method of FIGS. I and 2, using an assumed network on the cross section of the roughly preformed steel piece.
  • the surface part has some squares the height of which remain as high as before rolling, proving that the surface part was scarcely extended.
  • Such zone is shown with oblique lines in FIG. 38 though it does not exist actually with such a distinct boundary.
  • the area of the oblique lines varies according to ratios of the thickness and the width of the material, reductions, etc.
  • Distortion of the to-be-rolled material may occur due to the difference in extension rate between the surface part containing the unforged zone and other parts.
  • the present invention is based on the finding that the modification ofthe shape ofthe rolling pass ofthe vertical roll can eliminate the unforged zone.
  • FIG. 5 shows the head ofrail deformed by the vertical roll of part ofthe head ofrail 5 having a convex shape.
  • the unforged zone produced in the head of the rail is subjected to concentrated reduction by said convex part ofthe vertical roll, resulting in enforced rolling ofthe unforged zone.
  • part of the vertical roll is the unforged zone is not convex part of the vertical roll with the central part of the head of the rail when generally positioned above the surface of the roll table. and pushes up against the tip ofthe to-be-rolled material as carried over by the roll table and charged into the rolling mill.
  • edger rolls of the ordinary type before and behind the universal rolling mill as illustrated in FlG. H.
  • the vertical roll 10 of the universal rolling mill used at the early stage of rolling has the rolling pass shaped like the letter which concentrically reduces the whole of the part of the to-be-rolled material 6-! to be made into the head.
  • the thickness of the part to be made into the web and of the part to be made into the foot are reduced respectively by a pair of the horizontal rolls 1 and 2 and the vertical roll (11).
  • the material which has passed through the previous stage is subjected to reduction on the part to be concentration but since has been sufficiently forged, and the tip D, of the concave part corresponding to the corner part of the tioned restriction ofextension in the direction ofthe width; for example, if the taper for D,E is l/Z, that for IE is made l/2 l/l.5 and that for i H1.
  • FIG. 11 shows one example of the overall rolling apparatus the material is carried out by the universal rolling mill [V and the edger rolls [E,], which stage constitutes the abovementioned early stage ofrolling.
  • the material is charged into the universal rolling mill [V then for rolling the part to be made into the head, the material is charged into the edger roll [E having the vertical roll and the vertical roll, thereby overcoming such difficulties as mentioned above in connection with rolling operations, and giving strong forging to the part of the material to be made into the head, particularly of a rail which is required to meet severe operating conditions.
  • a method for rolling by the universal rolling mill steel material into shaped steel products having flanges such as rails and H-shaped articles comprising subjecting the part of said material to be made into a flange to a first rolling operation by a first vertical roll concentration of reduction force to the center of said part while preventingsubstantial restriction of extension of said part in the width direction thereof, thereby preventing the formation of an unforged zone of said part; subjecting said part to a second rolling operation by a second vertical roll of said universal rolling mill including imparting a smoothing reduction force to said part while increasing the restriction of extension of said part in the width direction thereof; and subjecting said part to a third rolling operation by a third vertical roll of said universal rolling mill including imparting a further smoothing reduction force to said part while further increasing the restriction of extension of said part in the width direction thereof.
  • a universal rolling mill for rolling steel material into shaped steel products having flanges such as rails and H shaped articles
  • the improvement comprising a first vertical roll adapted to contact that part of said material to be made into a flange, said first vertical roll having a convex portion around the periphery thereof adapted to impart a concentrated V-shaped reduction force to the center of said part, and concave portions on either side of said convex portion, the outward extensions of said concave portions forming curves having a lower rate of curvature than the corners of said part when finished, said curves adapted to prevent substantial restriction of extension of said part in the direction of the width thereof.
  • a universal rolling mill as claimed in claim 2 the further improvement comprising a second vertical roll adapted to contact said part, said second vertical roll having curves similar to but having a higher rate of curvature than said curves of said first vertical roll.
  • a universal rolling mill as claimed in claim 3, the further improvement comprising a third vertical roll adapted to contact said part, said third vertical roll having curves similar to but having a higher rate of curvature than said curves of said second vertical roll.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
US790766A 1968-01-16 1969-01-13 Method and apparatus for rolling steel material and rails or similarly shaped products Expired - Lifetime US3597954A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP221368 1968-01-16
LU58140 1969-03-04
DE1912350A DE1912350C3 (de) 1968-01-16 1969-03-12 Verfahren zum Walzen von Schienen sowie UniversalwalzenstraBe zur Durchführung dieses Verfahrens

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US3597954A true US3597954A (en) 1971-08-10

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US790766A Expired - Lifetime US3597954A (en) 1968-01-16 1969-01-13 Method and apparatus for rolling steel material and rails or similarly shaped products

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US (1) US3597954A (enrdf_load_stackoverflow)
DE (1) DE1912350C3 (enrdf_load_stackoverflow)
FR (1) FR2000306A1 (enrdf_load_stackoverflow)
GB (1) GB1252496A (enrdf_load_stackoverflow)
LU (1) LU58140A1 (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086801A (en) * 1976-03-31 1978-05-02 Nippon Steel Corporation H-shape metallic material rolling process
US4322962A (en) * 1978-09-12 1982-04-06 Kawasaki Steel Corporation Method of producing H-beams
US4503700A (en) * 1982-06-30 1985-03-12 Nippon Steel Corporation Method of rolling rails
US4615200A (en) * 1983-03-21 1986-10-07 Sacilor Forming process for metal rail blank
CN102527714A (zh) * 2011-12-30 2012-07-04 天津市宁河县隆昌异型轧钢厂 电梯t型导轨轧制方法及轧制孔型系统
CN113634624A (zh) * 2021-07-22 2021-11-12 武汉钢铁有限公司 在矫直过程中控制钢轨对称度的方法
CN115815488A (zh) * 2022-12-02 2023-03-21 中铁二院工程集团有限责任公司 一种无缝齿轨及其轧制机构、方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5931404B2 (ja) * 1979-08-03 1984-08-02 新日本製鐵株式会社 軌条およびその類似形鋼のユニバ−サル圧延方法
JPS6020081B2 (ja) * 1979-09-11 1985-05-20 川崎製鉄株式会社 粗形鋼片の成形方法
JPS5953121B2 (ja) * 1981-03-05 1984-12-24 川崎製鉄株式会社 粗形鋼片用大型素材の幅出し圧延方法とその圧延用ロ−ル
FR2515538B1 (enrdf_load_stackoverflow) * 1981-11-04 1985-05-17 Sacilor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US674222A (en) * 1901-03-13 1901-05-14 Joseph S Seaman Rolls for the manufacture of rails.
US1068467A (en) * 1912-02-14 1913-07-29 Wilhelm Vassen Method of rolling profile iron with parallel flanges.
US1201239A (en) * 1913-10-11 1916-10-17 Nicholas A Becker Railroad-rail-rolling mill.
US1385644A (en) * 1920-01-15 1921-07-26 Alvin L Roberts Universal mill
US1812247A (en) * 1928-12-27 1931-06-30 William C Oberg Rolling mill plant and method of operating same
US3165948A (en) * 1960-07-23 1965-01-19 Yawata Iron & Steel Co Method of rolling h-sectioned steel members and mill train for the same
US3342053A (en) * 1964-04-15 1967-09-19 Wendel & Cie De Method of producing rail sections

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US674222A (en) * 1901-03-13 1901-05-14 Joseph S Seaman Rolls for the manufacture of rails.
US1068467A (en) * 1912-02-14 1913-07-29 Wilhelm Vassen Method of rolling profile iron with parallel flanges.
US1201239A (en) * 1913-10-11 1916-10-17 Nicholas A Becker Railroad-rail-rolling mill.
US1385644A (en) * 1920-01-15 1921-07-26 Alvin L Roberts Universal mill
US1812247A (en) * 1928-12-27 1931-06-30 William C Oberg Rolling mill plant and method of operating same
US3165948A (en) * 1960-07-23 1965-01-19 Yawata Iron & Steel Co Method of rolling h-sectioned steel members and mill train for the same
US3342053A (en) * 1964-04-15 1967-09-19 Wendel & Cie De Method of producing rail sections

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4086801A (en) * 1976-03-31 1978-05-02 Nippon Steel Corporation H-shape metallic material rolling process
US4322962A (en) * 1978-09-12 1982-04-06 Kawasaki Steel Corporation Method of producing H-beams
US4503700A (en) * 1982-06-30 1985-03-12 Nippon Steel Corporation Method of rolling rails
US4615200A (en) * 1983-03-21 1986-10-07 Sacilor Forming process for metal rail blank
CN102527714A (zh) * 2011-12-30 2012-07-04 天津市宁河县隆昌异型轧钢厂 电梯t型导轨轧制方法及轧制孔型系统
CN102527714B (zh) * 2011-12-30 2015-01-14 天津市宁河县隆昌异型轧钢厂 电梯t型导轨轧制方法及轧制孔型系统
CN113634624A (zh) * 2021-07-22 2021-11-12 武汉钢铁有限公司 在矫直过程中控制钢轨对称度的方法
CN115815488A (zh) * 2022-12-02 2023-03-21 中铁二院工程集团有限责任公司 一种无缝齿轨及其轧制机构、方法

Also Published As

Publication number Publication date
DE1912350C3 (de) 1975-05-28
FR2000306A1 (enrdf_load_stackoverflow) 1969-09-05
LU58140A1 (enrdf_load_stackoverflow) 1969-07-07
DE1912350B2 (enrdf_load_stackoverflow) 1974-10-10
GB1252496A (enrdf_load_stackoverflow) 1971-11-03
DE1912350A1 (de) 1970-12-03

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