US3657912A - Universal method of rolling rails and a mill train for the same - Google Patents

Universal method of rolling rails and a mill train for the same Download PDF

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Publication number
US3657912A
US3657912A US881379A US3657912DA US3657912A US 3657912 A US3657912 A US 3657912A US 881379 A US881379 A US 881379A US 3657912D A US3657912D A US 3657912DA US 3657912 A US3657912 A US 3657912A
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United States
Prior art keywords
edging
rolling mill
rolling
universal
rail
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Expired - Lifetime
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US881379A
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English (en)
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Yoshiyuki Ishibashi
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
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
    • B21B2031/026—Transverse shifting the stand

Definitions

  • a universal method of rolling rails and a mill train for the same comprises an edging rolling mill set anterior to or/and posterior to a universal rolling mill.
  • the edging rolling mill consists of a first rail edging roll pass and a second edging roll pass containing a set of the pass designs so different as to have the radii to meet respective corners of the head and of the foot of the so-rolled rail made larger than those of the pass designs of the first edging roll pass.
  • the second edging roll pass is operated in combination with the universal rolling mill so as to conduct rolling following the rolling operation of the universal rolling mill and the first edging roll pass.
  • the present invention relates in general to a method of rolling rails and the mill train for the same, and more particularly to a method of rolling rails by a special edging rolling mill in combination with a universal rolling mill and a mill train for the same.
  • the universal rolling mill method is gaining popularity.
  • the universal rolling method is fundamentally different from the above rolling method of the roll pass type.
  • the former uses a universal rolling mill with the horizontal rolls and vertical rolls concentrating reduction on every part of the to-be-called material, particularly the upper surface and both sides of the part to be rolled into the head of the rail which will contact wheels, thus producing a rail having a head of good quality resulted from sufficient forging.
  • therail is sent to the edging rolling mill which is equipped with the roll pass so designed as to put the same reduction rate to the head and the foot, but the passing of such to-be-rolled material as the rail I having the head and the foot with greatly different stretched volumes causes different reduction rates between these parts, thus causing such troubles as bending of the so-called products, these troubles making any further reciprocal rolling impossible.
  • the corners of the head and of the foot of the so-rolled rail will form an acute angle, which constitutes a fatal shortcoming of the prior art method.
  • An object of the present invention is to provide a universal method of rolling rails, whereby the reciprocal rolling of rails is made possible by using an edging roll mill which can shift swiftly to a second edging rod for rolling the corners of the head and of the foot of the so-called rail so as to not form an acute angle.
  • These corners are all formed by using, in addition to the normal pass design, a second pass design with radii to cause the corners to be made larger than those of the abovementioned normal pass design, whereby a rail having a suffrciently forged head can be produced, thus solving the abovementioned problem of the universal rail rolling method which has been in use.
  • Another object of the present invention is to provide a mill train for rolling rails of high accuracy in size and shape, which requires no rolls of the roll pass type and which can be operated very easily compared with the operation of the rolling method of the roll pass type.
  • the present invention is developed in relation to a method of rolling rails by using a rolling mill train comprising a universal rolling mill, an edging rolling mill, a finishing rolling mill, etc., wherein said edging rolling mill is set anterior to and/or posterior to said universal rolling mill, and said edging rolling mill consists of a first rail edging roll pass (hereafter called the: first edging roll pass”) and a second roll pass (hereafter called the second edging roll pass) containing a set of the pass designs so different as to have radii to form respective corners of the head and the foot of the so-rolled rail larger than those of the pass designs of the first edging roll pass.
  • the rolling operation is carried out by using the combination of the second edging roll pass with the universal rolling mill following the rolling operation using the universal rolling mill and the first edging roll pass.
  • FIG. 1 shows a plan sketch of the universal rail rolling mill train conventionally in use.
  • FIG. 2 shows a plan perspective, with partial sections rotated, of the rolling operation as it is carried out by the universal rolling mill u, the edging rolling mill E and the finishing rolling mill F shown in FIG. 1.
  • FIG. 3 shows the progress of the material the universal rolling mill shown in FIG. 2.
  • FIG. 4 shows the progress of the material as it is rolled by the edging rolling mill shown in FIG. 2.
  • FIGS. SA-C show universal rail rolling mill trains according to the present invention.
  • FIG. 6 shows the progress of the material as it is rolled ac cording to the present invention.
  • FIGS. 1 and 2 show the conventional type of the universal mill train for rolling rails, in which a rough-rolled billet having a symmetrical section which has passed through the blooming rolling mill V1 and the breakdown rolling mill V2, is several times reciprocally subjected to the universal rolling mill to and the edging rolling mill E.
  • the universal rolling mill u has the horizontal rolls 6 and 7 to roll the web of the sorolled rail from above and below and the vertical rolling mills 4 and 5 to roll the head 1 and the foot 2 of the so-ro1led rail from both sides (since FIG.
  • the edging rolling mill E has the upper and lower horizontal rolls 8 and 9 with pass designs to edge the material which has passed through the universal rolling mill 14. After having passed through the edging rolling mill E, the material is sent to the final finishing rolling mill which is indicated with the sign F.
  • the line with the arrows shows the passage of the to-be-rolled material; 10 indicates the motor of each mill.
  • the material is sent to the universal rolling mill u.
  • the positions, at the first pass, of the vertical rolls 4 and 5 and the upper and lower horizontal rolls 6 and 7 are indicated respectively with 4-1, 5-1, 6-1 and 7-1, as they are reducing respectively the head 1, and foot 2 and the web 3.
  • the material is sent to the edging rolling mill E, as shown in FIG. 4; and the positions, at the first pass, of the horizontal rolls 8 and 9 are indicated respectively with 8-1 and 9-1.
  • the upper and lower horizontal rolls and the vertical rolls of the universal rolling mill u are so designed as to form any desired cross-section. Therefore, no acute angle is produced on the corners of the head 1 and the foot 2.
  • the horizontal rolls 8 and 9 of the edging rolling mill E have pass designs, so they are adjustable only in the upward and downward direction. This causes certain parts of the head I and the foot 2 not to meet the pass designs as rolling operation progresses. That is because, after the fifth pass of the head 1 of the so-rolled rail, there is produced a difference of AH in reduction from the first pass, causing the head 1 of the sorolled rail, at least its corner A, to leave and be free from contact by the pass designs of the horizontal rolls of the edge rolling mill.
  • corner A After being finished, corner A should have the prescribed radius R], But, since it has not been contacted by the pass designs of the edge rolling mill, the corner tends to have a shape of an acute angle; and residual stress is produced there due to insufficient forging.
  • the head 1 of the so-rolled rail is subjected to concentrated reduction by train wheels, and therefore it should be subjected to sufficient forging by the rolling mill prior to such concentrated reduction, and should have such a profile as to stand actual severe use.
  • the tandem rolling mill train having a number of universal rolling mills and edging rolling mills arranged alternately. But this sort of the rolling mill train is too expensive to be commercially practicable.
  • corner B of the foot 2 there will be seen the same situation. That is to say, even if the pass design is so constructed as to produce the prescribed curve rate on said corner B, as the rolling operation progresses, say, at the third pass, the difference of A occurs, causing the corner to not be contracted by the pass design. Said corner B of the foot 2 of the so-rolled rail'should have its radius designed so as not to damage rail sleepers or gather rust. Once an undesirable profile is formed at that stage, it is impossible to correctit by the finishing rolling mill F.
  • the present invention provides, in addition to the abovementioned edging roll pass, a second edging roll pass in the edging rolling mill E. This causes, at the latter stage of rolling operation, the prescribed radiuses for respective corners of the head and the foot of the so-rolled rail to be formed by the other edging roll pass.
  • the present invention is characterized by the arrangement of a blooming rolling mill, a universal rolling mill, an edging rolling mill, a finishing rolling mill, etc., and the rolling method using such arrangement of the rolling mills, wherein the edging rolling mill set near anterior and/or posterior to the universal rolling mill is provided with a second edging roll having such pass design as to form the curve rates prescribed to meet the corners of the head and the foot of the so-rolled rail, and the second edging roll is so designed as to move in a direction perpendicular to the rolling line.
  • V1, V2 and u indicate respectively a blooming rolling mill, a breakdown rolling mill and a universal roughing rolling mill; El and E2 indicate respectively a first edging roll and a second edging roll, of which pass designs are different one from the other; and F indicates a universal finishing rolling mill.
  • a steel billet is bloomed and roughed respectively by the blooming rolling mill V1 and the roughing rolling mill V2, and then subjected reciprocally in several passes to the edging roll E1, and the universal roughing rolling mill u.
  • FIG. 5B shows a rolling mill train, in which the first edging roll E1 and the second edging roll E2 having different pass designs one from the other, are arranged posterior to the universal roughing rolling mill u.
  • FIG. 5C shows a rolling mill train, in which the first edging roll El and the second edging roll E2 and another set of such rolls El and E2 having different pass designs one from the other are arranged respectively anterior and posterior to the universal rouging rolling mill :4.
  • FIG. 5B and 5C The rolling method by using the rolling mill trains shown in FIG. 5B and 5C, is the same as that by using the rolling mill train shown in FIG. 5A. But when using the rolling mill train shown in FIG. 5C, there are seen such advantages that while either of the edging rolls in used, the other acts as a guide, and while either of them is replaced after being worn out by a long period of use, the other can carry out rolling smoothly and perfectly.
  • FIG. 6 shows the enlarged view of the rolling operation carried out in the abovementioned situation.
  • the to-be-rolled material has been reduced by two passes through the universal rolling mill u and the edging roll El so as to have a certain cross-section, which process is the same as that used in the conventional method.
  • the corner A of the head 1 and the corner B of the foot 2 of the so rolled rail form an acute angle to some extent.
  • said edging roll E1 is made to move out of the rolling line, and instead of this roll, the second edging roll E2 is set on the rolling line, by movement of the edging rolling mill E itself or otherwise.
  • the second edging roll E2 has pass designs with the radius R1 for the corner A of the head I of the so-rolled rail and with the radius R2 for the corner B of the foot 2.
  • the material to be rolled into a roll is made to pass, one or two times, through the universal rolling mill u and the second edging roll E2.
  • the so-rolled rail is then subjected to the final finishing rolling mill F to become a final product.
  • the radius R1 of the corner A of the head must be made larger than the radius formed by the edging roll E1 of the former edging rolling mill. This is particularly to forging the corner of the rail which will be subjected most severely to mechanical impact.
  • the rail material rolled by the aforesaid universal mill is then reduced by the first pair of rolls E1 of the edging mill E.
  • the edging rolls El reduce the material excluding the top surfaces of the head 1 and the bottom surface of the foot 2 (respectively indicated by dotted lines in FIG. 6,) thus reducing the sides of the head 1 and foot 2 which have not been subjected to reduction by the previous passage through the universal mill u (pass E-l 1 in FIG. 6).
  • both mills u and E cooperate in complementary reduction of the material into an intended rail configuration. Subsequent passes through it and E1 are represented by 6-2 and El-2 in FIG. 6.
  • the universal mill u and the second pair of edging rolls E2 of the edging mill E are used for subsequent rolling.
  • these passes are represented by 6-3 and E2-1, respectively.
  • the edging mill E with rolls E2 mainly reduces the sides of the head 1 and the foot 2 which respectively include the corners A and B shown in FIG, 4.
  • the portions of rolls E2 which contact corners A and B are so formed that the radius of curvature RI on the border between the top surface of the head 1 and each of the side surfaces thereof and the radius of curvature R2 on the border between the bottom surface of the foot 2 and each of the side surfaces thereof are larger than the respective radii of rolls E1. Therefore, the corners A and B of the rail can be reduced sufficiently to be rounded and forged to a substantially increased degree.
  • the rolling mill train and the rolling method according to the present invention it is possible to produce rails of high accuracy in size with a single universal rolling mill and an edging mill which are inexpensive.
  • the quality of the so-rolled rail is as good as or even better than that of rails which are produced by such wellknown, but expensive rolling equipment as the tandem rolling mill.
  • said second pair of edging rolls having a contour such that the portions thereof which meet the corners of each of the head and foot of said rail have larger radii than those of the corresponding portions of said first pair of edging rolls, and again rolling the material subjected to the aforesaid reciprocative rolling, by the reciprocative passage through said second pair of edging rolls and said universal rolling mill, and
  • a universal rail rolling mill train including a universal rolling mill and an edging rolling mill, a rail being formed by reciprocating a roughly rolled billet back and forth through said universal rolling mill and said edging rolling mill; the improvement wherein said edging rolling mill comprises a first pair of edging rolls and a second pair of edging rolls, said pairs of edging rolls having portions formed to contact the corners of the head and foot of said roughly rolled billet while being formed into said rail, said portions of said second pairs of edging rolls have larger radii than said portions of said first pair of edging rolls; and means mounting said pairs of edging rolls for selectively shifting one of said pairs into the path of rolling of said rail and the other of said pairs out of said path.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
US881379A 1968-12-09 1969-12-02 Universal method of rolling rails and a mill train for the same Expired - Lifetime US3657912A (en)

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CA (1) CA944592A (enrdf_load_html_response)
DE (1) DE1960601C3 (enrdf_load_html_response)
FR (1) FR2025705A1 (enrdf_load_html_response)
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4370877A (en) * 1980-02-04 1983-02-01 Sacilor-Acieries Et Laminoirs De Lorraine Rolling mill rolls
US4503699A (en) * 1982-06-30 1985-03-12 Nippon Steel Corporation Method and apparatus for rolling rails
US4503700A (en) * 1982-06-30 1985-03-12 Nippon Steel Corporation Method of rolling rails
US4615201A (en) * 1983-06-17 1986-10-07 Sacilor System for replacing section rolling mill stands, multi-function stand-bearing trolley for positioning on the rolling sites and transport towards the pre-assembly sites
US4860426A (en) * 1986-10-27 1989-08-29 Sms Schloemann-Siemag Aktiengesellschaft System for rolling continuously cast profiles
US6564608B2 (en) * 2000-08-28 2003-05-20 Daniel & C. Officine Meccaniche Spa Rolling method and line for rails or other sections
US20100281668A1 (en) * 2003-08-07 2010-11-11 Cmc Steel Fabricators, Inc. Single Slitting Process For Recycling Rail
CN102059249A (zh) * 2010-11-23 2011-05-18 天津市中重科技工程有限公司 万能轨梁轧机的防侧弯立辊
CN104668287A (zh) * 2014-12-09 2015-06-03 攀钢集团攀枝花钢钒有限公司 钢轨万能轧机装置及钢轨轧制方法
CN106424138A (zh) * 2016-10-26 2017-02-22 攀钢集团攀枝花钢钒有限公司 万能轧机布置结构及轧制方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2844438C2 (de) * 1978-10-12 1986-06-05 SMS Schloemann-Siemag AG, 4000 Düsseldorf Walzstraße zum Walzen von schweren Trägerprofilen oder Schienen
DE2844433C2 (de) * 1978-10-12 1985-05-09 SMS Schloemann-Siemag AG, 4000 Düsseldorf Walzstraße zum wahlweisen Walzen von schweren Trägerprofilen oder Schienen
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
DE3132974A1 (de) * 1980-08-28 1982-04-15 Daidotokushuko K.K., Nagoya, Aichi Walzvorrichtung
FR2515538B1 (enrdf_load_html_response) * 1981-11-04 1985-05-17 Sacilor
RU2136408C1 (ru) * 1998-12-25 1999-09-10 Закрытое акционерное общество "Интеллект" Рельс
RU2135310C1 (ru) * 1998-12-25 1999-08-27 Закрытое акционерное общество "Интеллект" Рельс двухголовый

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4370877A (en) * 1980-02-04 1983-02-01 Sacilor-Acieries Et Laminoirs De Lorraine Rolling mill rolls
US4503699A (en) * 1982-06-30 1985-03-12 Nippon Steel Corporation Method and apparatus for rolling rails
US4503700A (en) * 1982-06-30 1985-03-12 Nippon Steel Corporation Method of rolling rails
US4615201A (en) * 1983-06-17 1986-10-07 Sacilor System for replacing section rolling mill stands, multi-function stand-bearing trolley for positioning on the rolling sites and transport towards the pre-assembly sites
US4860426A (en) * 1986-10-27 1989-08-29 Sms Schloemann-Siemag Aktiengesellschaft System for rolling continuously cast profiles
US6564608B2 (en) * 2000-08-28 2003-05-20 Daniel & C. Officine Meccaniche Spa Rolling method and line for rails or other sections
US20100281668A1 (en) * 2003-08-07 2010-11-11 Cmc Steel Fabricators, Inc. Single Slitting Process For Recycling Rail
US7996973B2 (en) * 2003-08-07 2011-08-16 Cmc Steel Fabricators, Inc. Single slitting process for recycling rail
CN102059249A (zh) * 2010-11-23 2011-05-18 天津市中重科技工程有限公司 万能轨梁轧机的防侧弯立辊
CN102059249B (zh) * 2010-11-23 2012-07-04 天津市中重科技工程有限公司 万能轨梁轧机的防侧弯立辊
CN104668287A (zh) * 2014-12-09 2015-06-03 攀钢集团攀枝花钢钒有限公司 钢轨万能轧机装置及钢轨轧制方法
CN106424138A (zh) * 2016-10-26 2017-02-22 攀钢集团攀枝花钢钒有限公司 万能轧机布置结构及轧制方法

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Publication number Publication date
FR2025705A1 (enrdf_load_html_response) 1970-09-11
DE1960601B2 (de) 1973-12-20
DE1960601C3 (de) 1974-07-11
CA944592A (en) 1974-04-02
GB1292849A (en) 1972-10-11
DE1960601A1 (de) 1970-06-18

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