US3425254A - Rolling of slabs - Google Patents

Rolling of slabs Download PDF

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Publication number
US3425254A
US3425254A US349022A US3425254DA US3425254A US 3425254 A US3425254 A US 3425254A US 349022 A US349022 A US 349022A US 3425254D A US3425254D A US 3425254DA US 3425254 A US3425254 A US 3425254A
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US
United States
Prior art keywords
groove
rolling
slab
ridge
height
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
US349022A
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English (en)
Inventor
Walter Bayer
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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
Application filed by Mannesmann AG filed Critical Mannesmann AG
Application granted granted Critical
Publication of US3425254A publication Critical patent/US3425254A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21B1/02—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

Definitions

  • Slabs are usually used as primary material for producing plate bars, sheet metal, or metal bands.
  • Slabs are usually used as primary material for producing plate bars, sheet metal, or metal bands.
  • a roll 1 which forms a part of a roll train in which there is a second symmetrically built counterroll that cooperates with the roll 1.
  • the roll 1 has a first groove A, a second groove B and a flat roll portion C.
  • the aforesaid counterroll of the roll train will have symmetrically arranged with the roll 1 appropriate grooves A and B and flat roll portions 'nce C; the grooves A and B of the two rolls complete the respective upset passes, and the flat portions C complete the flat rolling pass.
  • the slab is being passed during each upset thrust through a pass formed by the grooves shown at A and B, each of which has an internal central annular ridge that projects radially from the groove base.
  • the slab is first passed through the groove A which has a central annular internal ridge 3 that projects radially towards the groove opening from the base 2.
  • the side surfaces 4 of the groove A form an angle with each other (which is larger than the groove angle usually found with bloomer rolls now in used).
  • This angle is about 8.
  • the depth of the groove A is greater than that found in grooves of bloomer rolls now in use.
  • the slab is positioned with its width upright so that the narrower surfaces will form the top and bottom faces of the slab.
  • the ridge 3 will engage the central face section of the slab and will exert thereon a compressive force that is larger than the compressive force exerted on the side sections of the slab face.
  • the slab is in the same position through the groove B as it had been through the groove A.
  • the depth of the groove B is smaller than that of the groove A, and the radial height of the central ridge 5 is smaller than that of the ridge 3.
  • the convex summit of the ridge 3 in the groove A is spaced from the surface of the roll 1 for a distance smaller than that of the ridge Sin the groove B.
  • the angle formed between the side surfaces 6 of the groove B is approximately the same as that formed between the side surfaces 4 of the groove A.
  • the slab Upon the completion of the rolling through the groove B, the slab will bulge out at its side surfaces substantially uniformly throughout its width.
  • the flat rolling section C is, for the purpose of convenience and preference, and not in any limiting sense, shown adjacent the groove B, and serves to exert pressure against the bulge when the slab is passed through the pass formed by the flat rolling portions of the cooperat ing rolls of the roll train, with the slab turned for onequarter of one turn as compared to its previous position, so that the bulging sides face the rolling surfaces, for equalizing.
  • Example in the rolling schedule shown on the table below there is indicated the sequence of steps for rolling a slab, for example of an initial size of 1000 mm. (39.37 in.) by 250 mm. (9.84 in.) down to a shaped bloom of the size of 300 mm. (11.81 in.) by 250 mm. (9.84 in.).
  • the width of the slab is designated h
  • the thickness is indicated b.
  • Ah and Ab there are given the dilferences in width and, respectively, increase in thickness between the individual rolling thrusts.
  • the first two columns of the table indicate the number of thrusts and the grooves (A, B or C) used.
  • the pressure will not only be at right angle to the roll axis, but also at various angles to the vertical; as the groove A is wider than the rolling grooves of bloomer rolls now in use, the groove A owing to the aforesaid pressure distribution will be filled even near the contact surfaces of the roll; during the ensuing thrust of the slab through the groove B, there will be achieved a further increase in thickness up to the size of the groove B.
  • the second thrust or pass takes place in the groove B, which to a certain extent eliminates any excessive surface impression that had been imparted to the slab in the preceding thrust through the groove A.
  • the slab is, in an equalizing thrust, rolled by the fiat rolling portions C of the rolls.
  • each roll having portions with upset grooves and a fiat rolling portion, each groove comprising an internal central annular ridge projecting radially from the groove base for a height, a first of said grooves having a first depth and a first ridge, a second of said grooves having a second depth which is smaller than the first depth and having a radial height of ridge projection from the base which is smaller than that of said first ridge, whereby an elongated slab first being rolled through said first groove and thereafter through said second groove, with the slab width upright, will engage with its narrow face first the first ridge in the first groove and thereafter the second ridge in the second groove.
  • a roll for use in a roll train, having two upset grooves and a flat rolling portion, each upset groove comprising an internal central annular ridge projecting radially for a height from the groove base, the depth, and the height of the ridge projecting from the groove base, of the first groove being larger than the depth, and the height of the ridge projecting from the groove base, respectively, of said second groove.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Rolling (AREA)
US349022A 1963-03-14 1964-03-03 Rolling of slabs Expired - Lifetime US3425254A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEM56114A DE1254106B (de) 1963-03-14 1963-03-14 Stichfolge beim Herstellen von Halbzeug fuer Stabstahl- und Profilstahl-Walzwerke aus in Stranggiessanlagen erzeugten Gussbloecken

Publications (1)

Publication Number Publication Date
US3425254A true US3425254A (en) 1969-02-04

Family

ID=7308501

Family Applications (1)

Application Number Title Priority Date Filing Date
US349022A Expired - Lifetime US3425254A (en) 1963-03-14 1964-03-03 Rolling of slabs

Country Status (6)

Country Link
US (1) US3425254A (xx)
AT (1) AT251518B (xx)
BE (1) BE643545A (xx)
DE (1) DE1254106B (xx)
GB (1) GB1063373A (xx)
LU (1) LU45263A1 (xx)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52117861A (en) * 1976-03-31 1977-10-03 Nippon Steel Corp Method of rolling hhshaped metal material
JPS53123358A (en) * 1977-04-04 1978-10-27 Kawasaki Steel Co Steel plate rolling method
JPS5922602B2 (ja) * 1979-02-24 1984-05-28 日本鋼管株式会社 熱間粗圧延中におけるスラブの板幅の自動制御方法
JPS6020081B2 (ja) * 1979-09-11 1985-05-20 川崎製鉄株式会社 粗形鋼片の成形方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US318220A (en) * 1885-05-19 Process of rolling beams
US1425971A (en) * 1920-05-24 1922-08-15 Johns Charles Method of producing finished sections from iron and steel scrap
US1826622A (en) * 1929-10-12 1931-10-06 Firth Sterling Steel Co Method of rolling

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US318220A (en) * 1885-05-19 Process of rolling beams
US1425971A (en) * 1920-05-24 1922-08-15 Johns Charles Method of producing finished sections from iron and steel scrap
US1826622A (en) * 1929-10-12 1931-10-06 Firth Sterling Steel Co Method of rolling

Also Published As

Publication number Publication date
DE1254106B (de) 1967-11-16
AT251518B (de) 1967-01-10
GB1063373A (en) 1967-03-30
BE643545A (xx) 1964-05-29
LU45263A1 (xx) 1964-03-21

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