US3583193A - Rolling method and apparatus for producing h-shaped steel products having flanges of different thicknesses and similarly shaped steel products - Google Patents

Rolling method and apparatus for producing h-shaped steel products having flanges of different thicknesses and similarly shaped steel products Download PDF

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Publication number
US3583193A
US3583193A US782174A US3583193DA US3583193A US 3583193 A US3583193 A US 3583193A US 782174 A US782174 A US 782174A US 3583193D A US3583193D A US 3583193DA US 3583193 A US3583193 A US 3583193A
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Prior art keywords
rolls
vertical
flanges
roll
shaped steel
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US782174A
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English (en)
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Kanichi Kishikawa
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate

Definitions

  • the present invention relates to a rolling method and apparatus for producing H-shaped steel products having flanges of different thicknesses, rails, etc. by using a universal rolling mill.
  • the universal rolling mill is not completely free from problems.
  • the rolled material tends to bend and twist while rolled, causing inaccurate size-stability of the product or, at the worst, making it impossible to finish rolling, for such reasons as the difference in stretching rate of the two flanges and the difference in horizontal pressure of the two vertical rolls. That is to say, it is impossible for the universal rolling mill having vertical rolls of the same diameter to roll the material to produce such products having flanges of different thicknesses such as H-shaped steel products and rails.
  • An object of the present invention is to provide a rolling method and apparatus for rolling the material by using the universal rolling mill with the vertical rolls having been so arranged as to have different diameters, into such shaped products as H-shaped steel products having flanges of different thicknesses, such as rails.
  • Another object of the present invention is to provide a universal rolling mill capable of rolling the material easily and accurately into such shaped products as H-shaped steel products and rails, whichhas heretofore been impossible with the conventional universal rolling mill.
  • a pair of the vertical rolls of the universal rolling mill are so constructed that the diameter of one of them is made smaller than that of the other in correspondence with the difference in thickness of the flanges of the to-be-made product, thereby making equal or nearly equal the projected lengths of biting contact of these vertical rolls on the rolled material.
  • FIG. 1 shows an example of shaped steel products to be rolled by the method and apparatus of the present invention
  • FIG. 1 (A) and (B) show steel products shaped like rails and H-shaped steel products, respectively.
  • FIG. 2 is the longitudinal section of the conventional mill when rolling the material into a l-I-shaped steel product having flanges of different thicknesses to show the relation between the vertical roll and the material.
  • FIG. 3 is schematic diagram of the vertical roll of the conventional mill when operating, to show the relation with the material in comparison with the relation when operating the mill of the present invention.
  • FIG. 4 is another example similar to that shown in FIG. 3.
  • FIG. 5 is the longitudinal section of the rolling apparatus of the present invention when operated by the method of the present invention to produce a rail, and showing the relation between the vertical roll and the material.
  • horizontal pressure acting on the vertical rolls of the universal rolling mill may be generalized, as follows:
  • the imblance of horizontal pressure acting on the vertical rolls 1 and 2 causes the following problems:
  • the vertical roll 1 which is effected by greater vertical pressure tends to push the horizontal rolls 4 and 4' through the thinner flange 6 to the left.
  • the above sideslip (transverse) of the horizontal rolls 4 and 4 affects the formation of the thicker flange 5 placed between these rolls and the other vertical roll 2. If this is left unadjusted, it will become impossible to obtain products of accurate size.
  • a thrust metal is set on the neck of the horizontal roll in the roll housing.
  • This device is not desirable for such rolling methods as that of the present invention which is accompanied with extremely great horizontal pressure, for the following reasons:
  • the thrust metal is subjected to severe abrasion; the thickness of product is inconstant; it requires time and labor for repairs, hampering smooth rolling operations; and also its complicated structure enhances construction costs.
  • Another difficulty is that the vertical rolls 1 and 2 contact the rolled material at different points, therefore, as shown in FIG. 3, the line connecting the contact point Q of the thicker flange 5 of the rolled material and the contact point Q of the thinner flange 6 ofthe rolled material.
  • the present invention is intended to solve these problems by adjusting the diameter of the vertical rolls for rolling to produce, above all, H-shaped steel products having flanges of different thicknesses or other steel products ofa similar shape.
  • the special characteristics of the present invention relating to a rolling method and apparatus for producing such asymmetrical steel products as I-I-shaped steel products having flanges of different thicknesses with the universal rolling mill, consist in that the diameter of one vertical roll is made greater than that of the other vertical roll, thereby making equal or nearly equal the projected lengths of biting contact of the vertical rolls on the rolled material.
  • any difference in horizontal pressure may be directed in a predetermined direction so as to have the vertical roll of smaller diameter on the opposite side of this thrust contact the horizontal rolland thus absorb the side-slip of the horizontal roll, thereby completely solving the problems of conventional rolling.
  • FIG 3 and FIG. 5 The following IS a concrete explanation of the present invention using FIG 3 and FIG. 5.
  • a predetermined distance is maintained between the upper horizontal roll 4 and the lower horizontal roll 4 so as to maintain constant the thickness of web T; and the case 8 housing a pair of the vertical rolls 1 and 3 is placed within the same perpendicular section of said horizontal rolls 4 and 4.
  • the diameter of the vertical roll 3 on the side of the head 9 of the rail to be subjected to greater reduction is made smaller than that of the vertical roll 1 on the side of the base 10 of the rail to be subjected to smaller reduction.
  • the line connecting the contact points Q and 0 respectively of the vertical rolls 1 and 3 with the rolled material is made parallel with the line connecting the centers 0 and O of the vertical rolls, so as to make equal the projected lengths e,, and e, of biting contact of the rolls on the rolled material.
  • the rolling schedule is predetermined with relation to the size of the prefigured steel piece and that of the product, and to the number of passes and reduction by respective passes.
  • the diameters of the vertical rolls are then determined on the basis of the above schedule and other items, so as to make equal said projected lengths of biting contact.
  • Said vertical rolls 1 and 3 are housed in the vertical roll case 8.
  • the difference in horizontal pressure between the vertical rolls 1 and 3 taking place during rolling does not produce bending moment, since the contact points Q and Q become parallel with each other. Therefore, the difference, if any, of reduction rates between the two flanges will not cause the rolled material to bend.
  • Horizontal pressure acting on the vertical rolls 1 and 3 is, as follows:
  • P' horizontal pressure acting on the vertical roll 3 on the side of the head of the rail.
  • R diameter of the vertical roll 1.
  • R diameter ofthe vertical roll 3 Therefore, P,, P,.
  • the difference in horizontal pressure acting on the two vertical rolls due to the difference in reduction between the two flanges is absorbed by the contact of the part of the vertical roll to be subjected to smaller horizontal pressure with the horizontal roll.
  • the following device will make the process more advantageous and is preferable.
  • Sleeve rolls 11 are provided on the upper and lower parts of the vertical roll 3 of smaller diameter (on the side of the head of the rail) and held by bearings 13 and 14 set between said sleeve rolls and the axis 12 of the vertical roll, so that the sleeve rolls 11 contact the side of the horizontal rolls 4 and 4 and rotate independently of the vertical roll 3.
  • the horizontal rolls 4 and 4 move toward the vertical roll 3 on the side of the head of the rail which is subjected to smaller horizontal pressure, causing the sleeve rolls ll of the vertical roll 3 to contact the side of the horizontal rolls 4 and 4'. Therefore, the side of the vertical r0113 which is subjected to smaller horizontal pressure, should be so made as to maintain the designed size at the time of contacting the horizontal rolls 4 and 4. Thus, the horizontal rolls 4 and 4' move the vertical roll which is subjected to smaller horizontal pressure, and
  • the diameter of the other roll can be easily obtained from the reverse proportion of reduction rates.
  • the, present invention makes it possible to greatly stabilize rolling operations for the production of H- shaped steel products having flanges of different thicknesses and similarly shaped steel products, by equalizing the projected lengths of biting contact of the two rolls on the rolled material, thereby eliminating bend and torsion of the rolled material caused by horizontal pressure.
  • successful rolling can be attained also by making nearly equal the projected lengths of biting contact of the rolls by making the diameter of the roll which is subjected to the greater reduction rate, smaller than that of the other roll.
  • the difference in stretching rate should occur at every pass.
  • these flanges are not always the same in stretching rate. This is due mostly to play of parts of the rolling mill or difficulty in obtaining rolled materials of a desired size.
  • the present invention makes it possible to produce products having flanges of different desired thicknesses by taking up the greatest difference of allowance of stretching rate between the two flanges and by carrying out the rolling operation several times taking into consideration the difference of allowance of stretching rate between the flanges for each rolling operation.
  • a universal rolling mill for making asymmetrical H- shaped products having flanges of different thicknesses and similarly shaped products, said mill comprising a pair of horizontal rolls and a pair of vertical rolls, said vertical rolls positioned to roll said flanges, the improvement wherein the diameter of one of said vertical rolls is smaller than that of the other, such difference in diameter corresponding to the difference in thickness of said flanges, and comprising a pair of sleeve rolls mounted on said one of said vertical rolls having the smaller diameter, said pair of sleeve rolls contacting said horizontal rolls.
US782174A 1967-12-16 1968-12-09 Rolling method and apparatus for producing h-shaped steel products having flanges of different thicknesses and similarly shaped steel products Expired - Lifetime US3583193A (en)

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JP8043967 1967-12-16

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US3583193A true US3583193A (en) 1971-06-08

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US (1) US3583193A (fr)
DE (1) DE1814950C3 (fr)
FR (1) FR1597875A (fr)
GB (1) GB1245628A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023825A1 (fr) * 1979-08-03 1981-02-11 Nippon Steel Corporation Procédé de laminage de rails de chemin de fer et de profilés de forme analogue par laminage universel
US4518660A (en) * 1981-11-04 1985-05-21 Sacilor Shaped blanks, methods for their production and improvements to the universal rolling of rails
US4637241A (en) * 1983-03-21 1987-01-20 Sacilor Fully universal rolling process for H or I-beam type metal sections
WO2004009259A1 (fr) * 2002-07-19 2004-01-29 Danieli & C. Officine Meccaniche S.P.A. Procede de laminage a chaud de rails et installation a cet effet
CN113399453A (zh) * 2021-06-17 2021-09-17 马鞍山钢铁股份有限公司 热轧h型钢及其生产方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5921402A (ja) * 1982-06-30 1984-02-03 Nippon Steel Corp 連続ｈ形鋼圧延工程における軌条のユニバ−サル圧延方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US431623A (en) * 1890-07-08 Rolling mill
US657964A (en) * 1900-06-07 1900-09-18 Joseph S Seaman Manufacture of rails.
US3342053A (en) * 1964-04-15 1967-09-19 Wendel & Cie De Method of producing rail sections

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US431623A (en) * 1890-07-08 Rolling mill
US657964A (en) * 1900-06-07 1900-09-18 Joseph S Seaman Manufacture of rails.
US3342053A (en) * 1964-04-15 1967-09-19 Wendel & Cie De Method of producing rail sections

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023825A1 (fr) * 1979-08-03 1981-02-11 Nippon Steel Corporation Procédé de laminage de rails de chemin de fer et de profilés de forme analogue par laminage universel
US4344310A (en) * 1979-08-03 1982-08-17 Nippon Steel Corporation Method of rolling railroad-rails and steels of similar shape by universal rolling
US4518660A (en) * 1981-11-04 1985-05-21 Sacilor Shaped blanks, methods for their production and improvements to the universal rolling of rails
US4637241A (en) * 1983-03-21 1987-01-20 Sacilor Fully universal rolling process for H or I-beam type metal sections
WO2004009259A1 (fr) * 2002-07-19 2004-01-29 Danieli & C. Officine Meccaniche S.P.A. Procede de laminage a chaud de rails et installation a cet effet
US20060016236A1 (en) * 2002-07-19 2006-01-26 Franco Burco Method and plant for the hot rolling of rails
CN1299844C (zh) * 2002-07-19 2007-02-14 丹尼利机械设备股份公司 用于热轧钢轨的方法与设备
CN113399453A (zh) * 2021-06-17 2021-09-17 马鞍山钢铁股份有限公司 热轧h型钢及其生产方法
CN113399453B (zh) * 2021-06-17 2022-09-02 马鞍山钢铁股份有限公司 热轧h型钢及其生产方法

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Publication number Publication date
FR1597875A (fr) 1970-06-29
DE1814950A1 (de) 1970-02-19
GB1245628A (en) 1971-09-08
DE1814950B2 (de) 1975-02-27
DE1814950C3 (de) 1975-10-16

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