EP1306142B1 - Verfahren zum längstrennwalzen von walzgut - Google Patents

Verfahren zum längstrennwalzen von walzgut Download PDF

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Publication number
EP1306142B1
EP1306142B1 EP01957647A EP01957647A EP1306142B1 EP 1306142 B1 EP1306142 B1 EP 1306142B1 EP 01957647 A EP01957647 A EP 01957647A EP 01957647 A EP01957647 A EP 01957647A EP 1306142 B1 EP1306142 B1 EP 1306142B1
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.)
Expired - Lifetime
Application number
EP01957647A
Other languages
English (en)
French (fr)
Other versions
EP1306142A4 (de
EP1306142A1 (de
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"
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
Priority claimed from RU2000125597A external-priority patent/RU2176165C1/ru
Application filed by Respublikanskoe Unitarnoe Predpriyatie "Belorissky Metallurgichesky Zavod" filed Critical Respublikanskoe Unitarnoe Predpriyatie "Belorissky Metallurgichesky Zavod"
Publication of EP1306142A1 publication Critical patent/EP1306142A1/de
Publication of EP1306142A4 publication Critical patent/EP1306142A4/de
Application granted granted 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
    • 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)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Claims (1)

  1. Verfahren zum Walzen von Knüppeln, bei dem ein aufgeheizter Block nacheinander in Kasten-, Rhombus- und quadratischen Diagonalstichen einer Walzstraße gewalzt wird, gekennzeichnet durch das Walzen eines Knüppels in einem Kastenstich, anschließend in einem formgebenden Schlitzwalzstich in Form von zwei durch eine Brücke verbundenen Ovalen und danach in Rhombus- und quadratischen Diagonalstichen, wo das Walzen in zwei durch eine Brücke verbundenen Strängen erfolgt, wobei die doppelten diagonalen Quadrate in einem nachfolgenden Trennstich mit runden Kaliberstegen mit einem Radius R = (0,3...0,45) a geschnitten werden, wobei "a" die Kantenlänge des quadratischen Knüppels ist.
EP01957647A 2000-07-04 2001-06-29 Verfahren zum längstrennwalzen von walzgut Expired - Lifetime EP1306142B1 (de)

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 (ru) 2000-12-12 2000-12-12 Способ прокатки заготовок разделением
PCT/BY2001/000009 WO2002002250A1 (fr) 2000-07-04 2001-06-29 Procede de laminage de flans par separation

Publications (3)

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

Family

ID=25665749

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01957647A Expired - Lifetime EP1306142B1 (de) 2000-07-04 2001-06-29 Verfahren zum längstrennwalzen von walzgut

Country Status (5)

Country Link
EP (1) EP1306142B1 (de)
AT (1) ATE337861T1 (de)
AU (1) AU2001279512A1 (de)
DE (2) DE60122742T2 (de)
WO (1) WO2002002250A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101500174B1 (ko) * 2013-10-24 2015-03-06 주식회사 포스코 금속 소재 슬릿 장치

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101530859B (zh) * 2008-03-12 2012-11-21 新疆八一钢铁股份有限公司 小断面螺纹钢的6线切分轧制工艺
US11208727B2 (en) 2015-07-22 2021-12-28 Kolene Corporation Scale conditioning process for advanced high strength carbon steel alloys
CN115069766B (zh) * 2022-07-06 2023-06-13 山东钢铁集团永锋临港有限公司 一种用于四切分轧制生产Φ18mm热轧带肋钢筋的孔型系统

Family Cites Families (5)

* 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.
SU622514A1 (ru) * 1976-02-20 1978-07-22 Донецкий Ордена Трудового Красного Знамени Политехнический Институт Способ прокатки заготовок
SU1061860A1 (ru) * 1982-08-17 1983-12-23 Донецкий Ордена Трудового Красного Знамени Политехнический Институт Способ прокатки
RU2126728C1 (ru) * 1997-01-08 1999-02-27 Открытое акционерное общество "Западно-Сибирский металлургический комбинат" Способ сдвоенной прокатки арматурных профилей
US6050122A (en) * 1999-03-24 2000-04-18 Fabris; Mario Slitter for the production of multiple sections

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101500174B1 (ko) * 2013-10-24 2015-03-06 주식회사 포스코 금속 소재 슬릿 장치

Also Published As

Publication number Publication date
WO2002002250A1 (fr) 2002-01-10
EP1306142A4 (de) 2005-10-19
DE60122742T2 (de) 2007-08-23
AU2001279512A1 (en) 2002-01-14
DE1306142T1 (de) 2003-11-27
DE60122742D1 (de) 2006-10-12
ATE337861T1 (de) 2006-09-15
EP1306142A1 (de) 2003-05-02

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