US3703057A - Method for the production or restoration of working rolls for hot rolling of metallic flat products - Google Patents

Method for the production or restoration of working rolls for hot rolling of metallic flat products Download PDF

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Publication number
US3703057A
US3703057A US101077A US3703057DA US3703057A US 3703057 A US3703057 A US 3703057A US 101077 A US101077 A US 101077A US 3703057D A US3703057D A US 3703057DA US 3703057 A US3703057 A US 3703057A
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US
United States
Prior art keywords
roll
rolls
hot rolling
working rolls
production
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Expired - Lifetime
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US101077A
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English (en)
Inventor
Johann Krausz
Johan Feichtinger
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Voestalpine AG
Voest AG
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Voestalpine AG
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Publication date
Application filed by Voestalpine AG filed Critical Voestalpine AG
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Publication of US3703057A publication Critical patent/US3703057A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B28/00—Maintaining rolls or rolling equipment in effective condition
    • B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning

Definitions

  • the invention relates to a method for the production or restoration of working rolls for hot rolling metallic flat products, in particular for shaping steel slabs to pre-strips on broad strip mills, wherein the improvement resides in that the central circumferential zone of the roll body is provided with a greater coarseness than the two marginal zones. With this process it is possible to employ rolls with great hardness and yet obtain an excellent roll bite, so that the efficiency is greatly enhanced.
  • the invention relates to a method for the production or restoration of working rolls for hot rolling of metallic flat products, in particular for shaping steel slabs to pre-strips on broad strip mills.
  • the roll body of the working rolls is desired to be as hard as possible so as to prolong the life of the rolls expressed in metric tons throughput mrn abrasion or to keep small the necessary abrasion or grinding for restoring the original roll profile.
  • the friction angle of the roll is impairedwith increasing hardness so that the bite of the rolls is deteriorated and the electrical power of the roll stand cannot be fully exploited, i.e., the full rolling capacity cannot be reached.
  • harder rolls also the number of passes is greater and when the rolls slip through shocks may be exerted on the drive, particularly on the spindle couplings. Owing to the higher number of passes only lighter slabs may be inserted so that when strips are produced in the broad strip mill arranged in succession to the rolling stand coils of relatively low weight are obtained.
  • the wear of the working rolls has reached a certain degree, the original roll profile will have to be restored by grinding the entire body surface, which process is repeated at specific time intervals.
  • the center area of the working rolls is worn to a greater degree than the marginal areas when flat products are rolled; when a certain degree of wear is reached broad sheets or strips can no longer be rolled; then the rolls have to be removed and reground.
  • the invention is aimed at improving the operating conditions at hot rolling stands and at creating a method for the production or restoration of working rolls by which the described disadvantages and difficulti es may be eliminated or reduced.
  • the invention resides in that the central circumferential zone of the roll body is provided with a greater coarseness than the two marginal zones of the roll body.
  • the length of the central circumferential zone which is provided with a greater coarseness may amount to from about 1/5 to 1$ of the overall body length.
  • the central circumferential zone may artificially be roughened e.g. by means of sand jets.
  • the rolls are suitably re-ground only in the area of the marginal zones while the natural coarseness produced by the rolling process in the area of the central circumferential zone is retained.
  • the preferred application field for rolls produced or restored according to the invention is in shaping steel slabs to pre-strips for broad strip mills.
  • FIG. 1 is a schematical representation of a pair of working rolls in which the wear occurring in the course of rolling is illustrated on an excessive scale.
  • FIG. 2 is a longitudinal sectional view of a removed working roll prior to re-grinding, the surface layer being shown on enlarged scale.
  • FIG. 3* is a similar representation as FIG. 2 showing a roll re-groundaccording to the invention.
  • FIG. 1 shows the surface contour of a removed working roll; the contour is established by means of a testing device for ascertaining the coarseness.
  • the height of the illustrated zig-zag lines, the amplitudes, is a measure for the coarseness; for better clarity, the amplitudes areshown on an enlarged scale, the lines of the screen on the left hand side of FIGS. 2 and 3 indicating a distance of 0.05 mm.
  • the central area 2 of the rolls is provided with greater coarseness than the marginal zones 1.
  • the body length of the roll on which the measurements were carried out amounted to 2,240 mm'and the diameter D to 895.01 mm, the roll camber being 0.1 mm.
  • the maximum wear depth in the central area of the roll amounted to about 0.23 mm.
  • the contour of the original roll profile is denoted with 3.
  • FIG. 3 shows the roll profile of a roll that has been re-ground according to the invention. As proposed by the invention not the entire body surface was re-ground; instead, the coarseness obtained by rolling was maintained in the zone 2 in the middle part of the roll having a length L and only the marginal zones 1 were re-ground in customary manner.
  • the marginal zones denoted with I in FIG. 1 thus were adapted to the central zone 2 by means of grinding.
  • the contours of the ground rolling profile are denotedwith numeral 1 in FIG. 3.
  • This re-ground roll had a diameter D, of 894.54 mm, the roll abrasion (reduction of diameter) at the marginal zones 1 amounting to 0.47 mm.
  • the diameter D is indicated, to which the rolls had been ground so far, both in the marginal zones and in the central zone.
  • the diameter D,- corresponds to an abrasion of about 0.57 to 0.67mm over the entire body length; in the earlier method a certain subjective inaccuracy had been unavoidable.
  • the length of the zone L amounts to 500 to 800 mm.
  • the working time for grinding a roll was reduced from 6 to 4 hours.
  • the texture of the surface of the hot coils produced on the broad strip mill by rolling the pre-strips was not influenced. it has been shown that the use of hard working rolls, which are not ground 1 over the entire body length, does not entail any disadvantages.
  • the invention is also applicable with four-high rolling stands for the production of plates.
  • the central zone may be coarsened artificially already during production for example by sand blasting; the operating conditions in a rolling stand may then be improved during the whole life of the working having a predetermined length and two ends, comprising providing a prespecified central circumferential zone of said roll with a greater roughness than two predetermined marginal zones.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US101077A 1969-12-24 1970-12-23 Method for the production or restoration of working rolls for hot rolling of metallic flat products Expired - Lifetime US3703057A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT1203969A AT293321B (de) 1969-12-24 1969-12-24 Verfahren zur Herstellung bzw. Wiederherstellung von Arbeitswalzen für das Warmwalzen von metallischen Flachprodukten

Publications (1)

Publication Number Publication Date
US3703057A true US3703057A (en) 1972-11-21

Family

ID=3631956

Family Applications (1)

Application Number Title Priority Date Filing Date
US101077A Expired - Lifetime US3703057A (en) 1969-12-24 1970-12-23 Method for the production or restoration of working rolls for hot rolling of metallic flat products

Country Status (8)

Country Link
US (1) US3703057A (xx)
AT (1) AT293321B (xx)
BE (1) BE760469A (xx)
DE (1) DE2062162A1 (xx)
FR (1) FR2074183A5 (xx)
GB (1) GB1326809A (xx)
NL (1) NL7018262A (xx)
SE (1) SE356444B (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5651413A (en) * 1995-10-06 1997-07-29 Armco Inc. In-situ conditioning of a strip casting roll
US20030009872A1 (en) * 2001-07-10 2003-01-16 Self Leveling Machines, Inc. Symmetrical mill
CN113798928A (zh) * 2020-06-16 2021-12-17 上海梅山钢铁股份有限公司 一种防止四辊粗轧机打滑的工作辊磨削方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103846610B (zh) * 2012-12-05 2016-09-07 江苏南山冶金机械制造有限公司 芯棒等径修复工艺
BR112015021910B1 (pt) 2013-03-15 2022-08-30 Novelis Inc Métodos para preparar um cilindro de trabalho para aplicar um acabamento de brilho opaco sobre uma superfície de substrato de metal e para formar um acabamento de brilho opaco sobre um substrato de metal

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1697810A (en) * 1927-09-29 1929-01-01 Gregory J Comstock Nail and the like and method of making the same
US1743623A (en) * 1925-12-18 1930-01-14 J J Ross Mill Furnishing Compa Process for making grinding rolls for flour mills
US3089293A (en) * 1961-10-05 1963-05-14 Cincinnati Milling Machine Co Automatic control mechanism for roll grinder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1743623A (en) * 1925-12-18 1930-01-14 J J Ross Mill Furnishing Compa Process for making grinding rolls for flour mills
US1697810A (en) * 1927-09-29 1929-01-01 Gregory J Comstock Nail and the like and method of making the same
US3089293A (en) * 1961-10-05 1963-05-14 Cincinnati Milling Machine Co Automatic control mechanism for roll grinder

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5651413A (en) * 1995-10-06 1997-07-29 Armco Inc. In-situ conditioning of a strip casting roll
US20030009872A1 (en) * 2001-07-10 2003-01-16 Self Leveling Machines, Inc. Symmetrical mill
US20040197157A1 (en) * 2001-07-10 2004-10-07 Self Leveling Machines, Inc. Symmetrical mill
US6827530B2 (en) 2001-07-10 2004-12-07 Self Leveling Machines, Inc. Symmetrical mill
US6832424B2 (en) 2001-07-10 2004-12-21 Self Leveling Machines, Inc. Symmetrical mill
CN113798928A (zh) * 2020-06-16 2021-12-17 上海梅山钢铁股份有限公司 一种防止四辊粗轧机打滑的工作辊磨削方法

Also Published As

Publication number Publication date
GB1326809A (en) 1973-08-15
AT293321B (de) 1971-10-11
FR2074183A5 (xx) 1971-10-01
DE2062162A1 (de) 1971-07-01
SE356444B (xx) 1973-05-28
BE760469A (fr) 1971-05-27
NL7018262A (xx) 1971-06-28

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