EP0317841A2 - Procédé pour laminer des profilés par exemple des poutres - Google Patents

Procédé pour laminer des profilés par exemple des poutres Download PDF

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Publication number
EP0317841A2
EP0317841A2 EP88118798A EP88118798A EP0317841A2 EP 0317841 A2 EP0317841 A2 EP 0317841A2 EP 88118798 A EP88118798 A EP 88118798A EP 88118798 A EP88118798 A EP 88118798A EP 0317841 A2 EP0317841 A2 EP 0317841A2
Authority
EP
European Patent Office
Prior art keywords
stand
universal
bar
rolling
passes
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.)
Withdrawn
Application number
EP88118798A
Other languages
German (de)
English (en)
Other versions
EP0317841A3 (fr
Inventor
Alexander Svagr
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.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
Schloemann Siemag 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 SMS Schloemann Siemag AG, Schloemann Siemag AG filed Critical SMS Schloemann Siemag AG
Publication of EP0317841A2 publication Critical patent/EP0317841A2/fr
Publication of EP0317841A3 publication Critical patent/EP0317841A3/fr
Withdrawn legal-status Critical Current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
    • B21B1/08—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
    • B21B1/14—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 in a non-continuous process, i.e. at least one reversing stand
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/12—End of product

Definitions

  • the present invention is directed to a method of rolling bar sections, particularly beams or girders, in a rolling mill including reversing roughing or blooming stands and downstream universal mill stands, universal stand groups or two-­high stands.
  • the bar sections are pre-rolled for n-­passes in reversing blooming stands to form beam-blank sections.
  • the beam-blank sections are cropped on one or both ends and, subsequently, are finished rolled by inserting the cropped bar end into the finishing groove of the downstream stands.
  • Cropping the ends of bar section is especially necessary when rolling girders, because a more or less long web tongue forms at the end when rolling the bar section in the blooming stand.
  • the end must be removed prior to introducing the bar section into the universal stands.
  • the ends to be cropped have lengths of 500mm or more, depending on the size of the bar section. If the cropping operation is performed with a circular saw, the introduction of the bar section ends into the universal stands presents no particular difficulties.
  • the sawing process requires a comparatively long time, and the wear developed is so great that a saw-blade change must be performed after a short period of time, for instance, eight hours. Since an extraordinary amount of noise is generated during the sawing operation, special noise protection means have to be installed.
  • the bar ends are cropped by shears, there is the disadvantage that the bar ends are bent upwardly or downwardly from the rolling direction out of the section mid-axis. As a result, the lower edge of the cropped bar section strikes against the circumferential roll surfaces as it is conveyed on the rolling table and moves toward the entry groove of the downstream universal stand or two-high stand with a skipping and chattering action.
  • the introduction of the bent end into the groove in the universal stand provides considerable difficulty, particularly because of the comparatively narrow pre-set guide passages.
  • the primary object of the present invention is to modify the known method so that the difficulties and disadvantages mentioned above are avoided.
  • the improvement involves that after performing n -1 or less passes through the reversing blooming stands, the bar sections are cropped at one or both ends and subsequently are rolled in the same reversing blooming stands until n-passes are completed.
  • the ends of the bars shaped in the manner described above by the cropping shear cut are rolled in the same reversing blooming stands after the cropping cut, whereby the bends are removed and the cropped end is returned to its original position with respect to the central axis of the bar.
  • the method of the present invention involves an additional significant advantage. While the bar, with its bar ends cropped in accordance with the present invention, every now and then falls behind when entering the downstream universal stand, because the vertical rolls engage the flanges of the bar and the rolls are not driven, however, the driven horizontal rolls do not engage the flanges.
  • a short tongue portion of the web projected from the bar section surface in the course of the passes through the reversing blooming stand following the cropping cut are first engaged by the driven horizontal rollers as the bar section moves into the universal stand, thereby aiding the passage of the bar section into the roll gap of the universal stand without any difficulty.
  • the bar or rod to be rolled is introduced into the reversing blooming stand l in the direction of the arrow S in Figure 1.
  • the bar is moved with its front end on the rolling table 2 into the shears 3.
  • the front end is cropped by the shears and the bar is returned into the reversing blooming stand opposite to the direction of he arrow S and is rolled for two additional passes to form the desired beam-blank section.
  • the bending deflection at the end T′ of the bar T from the central plan M of the bar is indicated in dashed lines in Figure 2.
  • the deflected end, developed during the cropping step, is for practical purposes eliminated and the end T′ of the bar is in the form shown in solid lines in Figure 2.
  • the bar can be prematurely cropped in the appropriate manner at its rear end while passing through the shears 3 and can be rolled in the manner indicated above.
  • the insertion of the cropped rear end of the bar T into the reversing blooming stand 1 does not present any difficulties, because the rolls of the stand 1 can be moved away from one another to facilitate the insertion in a manner differently from for the universal stands 5, 6 in Figure 1, since at the reversing blooming stand there is no rolling equipment which has to be adjusted to a narrow dimension.
  • the bar After completing the rolling operation in the reversing blooming stand 1, as described above, the bar is fed by the transverse conveyor 8 into the rolling line of the universal rolling stand group made up of the universal stands 5 and 6 with a two-high edging stand 7 located between them.
  • the drives 9, 10 and 11 are connected, respectively, to the universal stand 5, the two-high edging stand 7, and the universal stand 6.
  • the bar passes through the universal rolling stand group, it is finish rolled in the usual manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
EP88118798A 1987-11-26 1988-11-11 Procédé pour laminer des profilés par exemple des poutres Withdrawn EP0317841A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3740111 1987-11-26
DE19873740111 DE3740111A1 (de) 1987-11-26 1987-11-26 Arbeitsverfahren zum walzen von profilstaeben, insb. traegern

Publications (2)

Publication Number Publication Date
EP0317841A2 true EP0317841A2 (fr) 1989-05-31
EP0317841A3 EP0317841A3 (fr) 1989-10-25

Family

ID=6341342

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88118798A Withdrawn EP0317841A3 (fr) 1987-11-26 1988-11-11 Procédé pour laminer des profilés par exemple des poutres

Country Status (2)

Country Link
EP (1) EP0317841A3 (fr)
DE (1) DE3740111A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5499523A (en) * 1993-10-19 1996-03-19 Danieli United, Inc. Method for producing metal strips having different thicknesses from a single slab

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2344652A1 (de) * 1972-09-06 1974-03-14 Mitsubishi Electric Corp Verfahren zur kompensation der schwanzstuecke von walzgut

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2344652A1 (de) * 1972-09-06 1974-03-14 Mitsubishi Electric Corp Verfahren zur kompensation der schwanzstuecke von walzgut

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5499523A (en) * 1993-10-19 1996-03-19 Danieli United, Inc. Method for producing metal strips having different thicknesses from a single slab

Also Published As

Publication number Publication date
DE3740111A1 (de) 1989-06-08
EP0317841A3 (fr) 1989-10-25

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