EP1306142A1 - Method for separating rolling of stock material - Google Patents

Method for separating rolling of stock material Download PDF

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Publication number
EP1306142A1
EP1306142A1 EP01957647A EP01957647A EP1306142A1 EP 1306142 A1 EP1306142 A1 EP 1306142A1 EP 01957647 A EP01957647 A EP 01957647A EP 01957647 A EP01957647 A EP 01957647A EP 1306142 A1 EP1306142 A1 EP 1306142A1
Authority
EP
European Patent Office
Prior art keywords
pass
rolling
feed
square
billet
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.)
Granted
Application number
EP01957647A
Other languages
German (de)
French (fr)
Other versions
EP1306142B1 (en
EP1306142A4 (en
Inventor
Alexandr Nickolaevich Bondarenko
Vadim Vladimirovich Philippov
Michail Pavlovich Gulyaev
Yuri Vladimirovich Dyachenko
Vladimir Andreevich Tischenko
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.)
Respublikanskoe Unitarnoe Predpriyatie "Belorissky Metallurgichesky Zavod"
Original Assignee
Respublikanskoe Unitarnoe Predpriyatie "Belorissky Metallurgichesky Zavod"
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Filing date
Publication date
Priority claimed from RU2000125597A external-priority patent/RU2176165C1/en
Application filed by Respublikanskoe Unitarnoe Predpriyatie "Belorissky Metallurgichesky Zavod" filed Critical Respublikanskoe Unitarnoe Predpriyatie "Belorissky Metallurgichesky Zavod"
Publication of EP1306142A1 publication Critical patent/EP1306142A1/en
Publication of EP1306142A4 publication Critical patent/EP1306142A4/en
Application granted granted Critical
Publication of EP1306142B1 publication Critical patent/EP1306142B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21B1/0815—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
    • 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
    • B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B1/026—Rolling
    • 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

Definitions

  • the present invention relates to rolling process, particularly to the methods of rolling at reversing mills, roughing mills, continuous billet mills and heavy section mills chiefly for billet production.
  • the method of billet rolling at a reversing roughing mill [1] which includes applying of successive flat box passes with the groove bottom surface bent relative to its vertical axis towards the sidewalls situated on the body of the roll along its length, a square box pass with the groove sidewalls taper, a rhombic pass and a diagonal square pass was taken as a prototype.
  • the disadvantage of this method is the tendency of the feed coming from the rhombic pass to twist in the diagonal square pass which results in a worse quality of the finished product. This happens because the feed coming from the square box pass loses its diagonal symmetry during the operation (e.g. this may be caused by a wear of the pass). Due to this reason the feed coming from the rhombic pass loses its rhombic shape, i.e. the rhomb made in this pass loses its diagonal symmetry. When such feed goes through the diagonal square pass, it twists round its longitudinal axis and, besides the impairment of the quality of the finished product, this causes feed handling problems (e.g. manipulating, cross motion, etc.), it also makes the rolling cycle longer and lowers mill performance characteristics .
  • the object of the present invention is to provide simultaneous double feed rolling in square passes, to improve finished product quality, particularly its macrostructure, giving a heavy reduction to ingot core part, to improve mill performance characteristics.
  • Technological effects of the present invention are elimination of the feed twisting round its longitudinal axis in the diagonal square passes, decrease of ingot macrostructure defects due to axial porosity compacting and complete elimination of carbon segregation.
  • Fig. 1 illustrates a roll pass design consisting of five passes.
  • Fig.2 schematically represents the pass consisting of two diagonal squares connected by a bridge.
  • Fig.3 schematically represents a breaking pass, providing the bridge breaking and the double feed splitting into two separate billets.
  • the process of rolling using the system of passes according to the present invention is done as follows.
  • the original ingot with square or rectangular cross-section is heated in the reheating furnace of a roughing mill and is rolled first in a box pass 1 with the groove bottom surface bent about the pass vertical axis.
  • the feed is rolled in a forming (slitting) pass 2 having the shape of a twin feed, both parts of which have similar sectional areas of an oval or rhombic shape connected by a bridge.
  • the rolling method of the invention allows a greater degree of deformation of the original ingot core part where casting defects - central porosity and carbon segregation - are concentrated. For instance, diagonal square height total reduction coefficient in pass 4 is 1.8, and bridge total reduction coefficient in this pass is 75. High degree of the feed core part deformation allows to eliminate the original ingot central porosity. Due to the rolling method of the invention carbon segregation (casting defect) moves to the bridge area connecting two diagonal squares (fig.2).
  • the method of the invention is implemented at a roughing two-high reversing rolling mill 850 at the Democratic Unitary Enterprise "Byelorussian Steel Works” in manufacturing of high carbon steel st80 cord square billet 125x125 mm used for cord rod production.
  • the original ingot with square or rectangular cross-section is heated in the heating furnace of a roughing mill and is rolled first in a box pass 1 with the groove bottom surface bent about the pass standing axis.
  • the feed is rolled in a forming (slitting) pass 2 having the shape of double feed, both parts of which have the same sectional areas of an oval or rhombic shape connected by a bridge.
  • a forming (slitting) pass 2 having the shape of double feed, both parts of which have the same sectional areas of an oval or rhombic shape connected by a bridge.
  • the incoming rectangular feed centers itself in the pass at the moment of nipping due to simultaneous four-angle contact with the sidewalls of the pass and after slitting by means of the pass grooves ridges situated on the central vertical axis of the pass, two feeds with the same cross-section connected by a bridge are formed.
  • the method of the invention implemented under the conditions of the roughing rolling mill 850 allows to eliminate diagonal square twisting round the longitudinal axis, to improve mill performance characteristics due to simultaneous two square billets 125x125 mm rolling in the last pass and improve the billet macrostructure quality due to axial porosity compacting and complete elimination of carbon segregation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)

Abstract

The present invention relates to rolling process, particularly to the methods of double feed rolling with its following slitting in the rolling mill line and its following two-strand rolling, and can be implemented at two-high reversing and billet mills.
The object of the present invention is to provide simultaneous double feed rolling in square passes, to improve finished product quality, particularly its macrostructure, giving a heavy reduction to ingot core part, to improve mill performance characteristics.
Technological effects of the present invention are elimination of the feed twisting round its longitudinal axis in diagonal square passes, decrease of the ingot macrostructure defects due to axial porosity compacting and complete elimination of segregation.
Slitting method of billet rolling is the method whereby a heated ingot is successively rolled in box, rhombic and diagonal square passes of the rolling mill.
The method is different from the previously known methods because after the box pass the feed is rolled in a forming slitting pass having the shape of two ovals connected by a bridge and after that in rhombic and diagonal square passes it is further rolled into two feeds connected by a bridge, whereby the double diagonal square feed is slit at a breaking pass by means of round groove ridges having the radius R = (0,3...0,45)a, where "a" is a square billet side. 1il.

Description

    Field of the invention
  • The present invention relates to rolling process, particularly to the methods of rolling at reversing mills, roughing mills, continuous billet mills and heavy section mills chiefly for billet production.
    • Description of the prior art
  • The following methods are already known: billet rolling at roughing and billet mills by means of successively arranged box passes, a square box pass, rhombic and diagonal square passes.
  • The method of billet rolling at a reversing roughing mill [1] which includes applying of successive flat box passes with the groove bottom surface bent relative to its vertical axis towards the sidewalls situated on the body of the roll along its length, a square box pass with the groove sidewalls taper, a rhombic pass and a diagonal square pass was taken as a prototype.
  • The disadvantage of this method is the tendency of the feed coming from the rhombic pass to twist in the diagonal square pass which results in a worse quality of the finished product. This happens because the feed coming from the square box pass loses its diagonal symmetry during the operation (e.g. this may be caused by a wear of the pass). Due to this reason the feed coming from the rhombic pass loses its rhombic shape, i.e. the rhomb made in this pass loses its diagonal symmetry. When such feed goes through the diagonal square pass, it twists round its longitudinal axis and, besides the impairment of the quality of the finished product, this causes feed handling problems (e.g. manipulating, cross motion, etc.), it also makes the rolling cycle longer and lowers mill performance characteristics .
  • Other disadvantages of this rolling method are:
    • Impossibility to improve the ingot macrostructure having internal melting defects concentrated in its core part (e.g. central porosity, carbon segregation);
    • Worse quality of the finished product and lower mill performance characteristics caused by the feed coming from the rhombic pass tendency to twist in the diagonal square pass due to the loss of the feed diagonal symmetry while passing through the box passes during the operation (e.g. due to the pass wear);
    • low production rate of the mill.
    Summary of the invention
  • The object of the present invention is to provide simultaneous double feed rolling in square passes, to improve finished product quality, particularly its macrostructure, giving a heavy reduction to ingot core part, to improve mill performance characteristics.
  • Technological effects of the present invention are elimination of the feed twisting round its longitudinal axis in the diagonal square passes, decrease of ingot macrostructure defects due to axial porosity compacting and complete elimination of carbon segregation.
  • The object of the present invention is achieved because in the slitting method of billet rolling according to which a heated feed is rolled successively in box, rhombic and diagonal square passes of the rolling mill, after the box pass a feed is rolled in a forming slitting pass having the shape of two ovals connected by a bridge and after that in rhombic and diagonal square passes it is further rolled into two feeds connected by a bridge, whereby double diagonal squares are slit in a breaking pass by means of round groove ridges having the radius R = (0,3...0,45)a, where a - a square billet side.
  • The difference between the method of the present invention and its prototype is that after the box pass the feed is rolled in the forming slitting pass having the shape of two ovals connected by a bridge and then in rhombic and diagonal square passes in the form of two grooves connected by a bridge, whereby the dual diagonal squares are slit in the breaking pass by means of round groove ridges having the radius R = (0,3...0,45)a, where a - a square billet side.
    • Brief description of the drawings
  • The following drawings are given to illustrate the invention.
  • Fig. 1 illustrates a roll pass design consisting of five passes.
  • Fig.2 schematically represents the pass consisting of two diagonal squares connected by a bridge.
  • Fig.3 schematically represents a breaking pass, providing the bridge breaking and the double feed splitting into two separate billets.
    • Preferable embodiments of the invention
  • The process of rolling using the system of passes according to the present invention is done as follows. The original ingot with square or rectangular cross-section is heated in the reheating furnace of a roughing mill and is rolled first in a box pass 1 with the groove bottom surface bent about the pass vertical axis. After the box pass the feed is rolled in a forming (slitting) pass 2 having the shape of a twin feed, both parts of which have similar sectional areas of an oval or rhombic shape connected by a bridge. In the process of deformation in pass 2 incoming rectangular feed centers itself in the pass at the moment of nipping due to simultaneous four - angle contact with the sidewalls of the pass and after slitting by means of the pass grooves ridges situated on the central vertical axis of the pass, two feeds with the same cross-section connected by a bridge are formed. The following feed forming is carried out in two passes representing double passes with rhombic (pass 3) and rectangular (pass 4) cross-sections connected by bridges, where deformation occurs in a rhombic - square roll pass design without twisting round the longitudinal axis as distinct from the previously known rhomb - square pass design method (1).
  • The rolling method of the invention allows a greater degree of deformation of the original ingot core part where casting defects - central porosity and carbon segregation - are concentrated. For instance, diagonal square height total reduction coefficient in pass 4 is 1.8, and bridge total reduction coefficient in this pass is 75. High degree of the feed core part deformation allows to eliminate the original ingot central porosity. Due to the rolling method of the invention carbon segregation (casting defect) moves to the bridge area connecting two diagonal squares (fig.2).
  • The double feed being rolled in pass 5 is slit into two square billets by means of slitting ridges having the radius R = (0,30-0,45)a, where "a" is square billet side (Fig.3), separating the double diagonal square to the distance l2 (fig.2), which is 1,1 - 1,3 times as long as the distance l1.
  • Separated square billets having remains of the bridge at the point of slitting are dressed with a grinding machine removing bridge remains where carbon segregation is concentrated.
    • Industrial application
  • The method of the invention is implemented at a roughing two-high reversing rolling mill 850 at the Republican Unitary Enterprise "Byelorussian Steel Works" in manufacturing of high carbon steel st80 cord square billet 125x125 mm used for cord rod production.
  • The original ingot with square or rectangular cross-section is heated in the heating furnace of a roughing mill and is rolled first in a box pass 1 with the groove bottom surface bent about the pass standing axis. After the box pass the feed is rolled in a forming (slitting) pass 2 having the shape of double feed, both parts of which have the same sectional areas of an oval or rhombic shape connected by a bridge. In the process of deformation in pass 2 the incoming rectangular feed centers itself in the pass at the moment of nipping due to simultaneous four-angle contact with the sidewalls of the pass and after slitting by means of the pass grooves ridges situated on the central vertical axis of the pass, two feeds with the same cross-section connected by a bridge are formed. The following feed formation is carried out in two passes representing double passes with rhombic (pass 3) and rectangular (pass 4) cross-sections connected by bridges, where deformation occurs without twisting round the longitudinal axis as distinct from the previously known rhomb-square pass design method.
  • The double feed being rolled in pass 5 is slit into two square billets by means of slitting ridges having the radius R = (0,30-0,45)a, where "a" - a square billet side (Fig.3), separating double diagonal squares to the distance l2 (fig.2), which is 1,1 - 1,3 times as long as the distance l1.
  • Separated square billets having bridge remains at the point of slitting are dressed with a grinding machine, thus, bridge remains where segregation is carbon concentrated are removed.
  • The method of the invention implemented under the conditions of the roughing rolling mill 850 allows to eliminate diagonal square twisting round the longitudinal axis, to improve mill performance characteristics due to simultaneous two square billets 125x125 mm rolling in the last pass and improve the billet macrostructure quality due to axial porosity compacting and complete elimination of carbon segregation.
    • Source of information
  • 1. Filippov I.N. and others. Roll pass designs atlas. - M.: Chermetinformatsiya, 1965. - pp. 11 - 12 (prototype).

Claims (1)

  1. The slitting method of billet rolling according to which heated ingot is rolled successively in box, rhombic and diagonal square passes of the rolling mill distinguished by rolling of a billet in a forming slitting pass having the shape of two ovals connected by a bridge after the box pass and after that in rhombic and diagonal square passes it is further rolled into two feeds connected by a bridge, where the double diagonal squares are slit in a breaking pass by means of round groove ridges having the radius R = (0,3...0,45)a, where "a" is a square billet side.
EP01957647A 2000-07-04 2001-06-29 Method for separating rolling of stock material Expired - Lifetime EP1306142B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
BY20000637 2000-07-04
BY20000637 2000-07-04
RU2000125597 2000-10-12
RU2000125597A RU2176165C1 (en) 2000-12-12 2000-12-12 Billet separation rolling method
PCT/BY2001/000009 WO2002002250A1 (en) 2000-07-04 2001-06-29 Method for separating rolling of stock material

Publications (3)

Publication Number Publication Date
EP1306142A1 true EP1306142A1 (en) 2003-05-02
EP1306142A4 EP1306142A4 (en) 2005-10-19
EP1306142B1 EP1306142B1 (en) 2006-08-30

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EP01957647A Expired - Lifetime EP1306142B1 (en) 2000-07-04 2001-06-29 Method for separating rolling of stock material

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EP (1) EP1306142B1 (en)
AT (1) ATE337861T1 (en)
AU (1) AU2001279512A1 (en)
DE (2) DE60122742T2 (en)
WO (1) WO2002002250A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101530859B (en) * 2008-03-12 2012-11-21 新疆八一钢铁股份有限公司 6-line splitting and rolling technology for deformed steel bar with small section

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101500174B1 (en) * 2013-10-24 2015-03-06 주식회사 포스코 Slitting Device for metal material and Slitting method thereof
JP6909786B2 (en) 2015-07-22 2021-07-28 コリーン コーポレーションＫｏｌｅｎｅ Ｃｏｒｐｏｒａｔｉｏｎ Scale conditioning process for advanced high strength carbon steel alloys
CN115069766B (en) * 2022-07-06 2023-06-13 山东钢铁集团永锋临港有限公司 Hole pattern system for producing phi 18mm hot rolled ribbed steel bar by four-segment rolling

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191128777A (en) * 1911-12-21 1912-12-23 Thomas Doughty Improvements in Rolling Metals, and in Mills and Appliances Employed therein.

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
SU622514A1 (en) * 1976-02-20 1978-07-22 Донецкий Ордена Трудового Красного Знамени Политехнический Институт Billet-rolling method
SU1061860A1 (en) * 1982-08-17 1983-12-23 Донецкий Ордена Трудового Красного Знамени Политехнический Институт Method of rolling
RU2126728C1 (en) * 1997-01-08 1999-02-27 Открытое акционерное общество "Западно-Сибирский металлургический комбинат" Method for two-strand rolling of reinforcing shapes
US6050122A (en) * 1999-03-24 2000-04-18 Fabris; Mario Slitter for the production of multiple sections

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191128777A (en) * 1911-12-21 1912-12-23 Thomas Doughty Improvements in Rolling Metals, and in Mills and Appliances Employed therein.

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch, Week 197926 Derwent Publications Ltd., London, GB; Class M21, AN 1979-48746B XP002342308 -& SU 622 514 A (DONETSK POLY) 22 July 1978 (1978-07-22) *
DATABASE WPI Section Ch, Week 199402 Derwent Publications Ltd., London, GB; Class M21, AN 1994-015278 XP002342307 -& SU 1 784 293 A1 (FERROUS METALLURGY INST) 30 December 1992 (1992-12-30) *
See also references of WO0202250A1 *
SHUBIN S G ET AL: "INVESTIGATION OF THE TECHNOLOGICAL POSSIBILITIES OF THE PROCESS OF MULTISTRAND ROLLING AND SEPARATING ROUNDS" STEEL IN TRANSLATION, INSTITUTE OF MATERIALS, LONDON, GB, vol. 29, no. 8, 1999, pages 55-58, XP000976460 ISSN: 0967-0912 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101530859B (en) * 2008-03-12 2012-11-21 新疆八一钢铁股份有限公司 6-line splitting and rolling technology for deformed steel bar with small section

Also Published As

Publication number Publication date
EP1306142B1 (en) 2006-08-30
DE60122742D1 (en) 2006-10-12
ATE337861T1 (en) 2006-09-15
WO2002002250A1 (en) 2002-01-10
DE60122742T2 (en) 2007-08-23
DE1306142T1 (en) 2003-11-27
EP1306142A4 (en) 2005-10-19
AU2001279512A1 (en) 2002-01-14

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