EP0194322A1 - Laminoir - Google Patents

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Publication number
EP0194322A1
EP0194322A1 EP85102468A EP85102468A EP0194322A1 EP 0194322 A1 EP0194322 A1 EP 0194322A1 EP 85102468 A EP85102468 A EP 85102468A EP 85102468 A EP85102468 A EP 85102468A EP 0194322 A1 EP0194322 A1 EP 0194322A1
Authority
EP
European Patent Office
Prior art keywords
crown
rolls
roll
plate
given
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
EP85102468A
Other languages
German (de)
English (en)
Other versions
EP0194322B1 (fr
Inventor
Hisatoshi Yoshii
Hidekazu Watanabe
Osamu Takemoto
Hiromi Matsumoto
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to AT85102468T priority Critical patent/ATE36256T1/de
Priority to EP85102468A priority patent/EP0194322B1/fr
Priority to DE8585102468T priority patent/DE3564202D1/de
Publication of EP0194322A1 publication Critical patent/EP0194322A1/fr
Application granted granted Critical
Publication of EP0194322B1 publication Critical patent/EP0194322B1/fr
Expired 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
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control

Definitions

  • the present invention relates to a rolling mill for metal stocks, and more particularly to a rolling mill which over a wide range can control the plate crown.
  • the work rolls are subjected to a large rolling load which causes a deflection of the rolls, while the portion of the roll surface which is in contact with the rolling stock is forced to be flat.
  • the edges of the plate being rolled are extended sidewise so that the distribution of thickness of the rolled plate in the direction of the roll axis will be as shown in Fig. 1, leaving the thickest portion in the rolled center of the plate, which gradually becomes thinner toward the plate edges.
  • This is the phenomenon of plate crown usually seen in the conventional rolling mill operation.
  • the amount of-the plate crown varies depending on the rolling variables, the thermal expansion of the rolls and the roll wear.
  • Fig. 1 B represents the plate width
  • tM represents the thickness of the rolled center of the plate
  • tE represents the thickness of the plate edges
  • the plate crown is represented by tM - tE.
  • Fig. 3 shows the.controllability range of plate crown defined by roll deformation under uniform force (herein called the controllability range of plate crown under uniform force) obtainable by various crown values given to the back-up rolls.
  • the plate crown under uniform force means a calculated plate crown from the plate thickness distribution defined by the shape of work rolls determined by the deformation of the rolls caused by the load acting on the rolls imposed by the mill stand, which load is assumed to be distributed uniformly across the width of the plate being rolled.
  • This calculated plate crown is not identical to the actual plate crown, but is very useful for relative comparison of the plate crown controllability of rolling mills.
  • One object of the present invention is to provide a rolling mill which can effectively control the plate crown in plate rolling by overcoming the problems of the conventional arts in reducing and controlling the plate crown as aforementioned.
  • the gist of the present invention lies in that a convex roll crown C BUR -of 0.5 to 10 mm in diameter is given to at least one back-up roll which is in contact with one of a pair of upper and lower work rolls and a concave crown C WR is given to at least one of the work rolls under the condition; whereby an effective plate crown control can be made for all various widths of plates to be rolled.
  • an increased amount of the convex crown given to the back-up roll will expand the controllability range of plate crown under uniform force, but the increased amount will cause a contact stress, (Hertz's contact stress), between the back-up rolls and the work rolls as shown in Fig. 6, and the maximum linear load is imposed on the rolled center of the plate as shown in Fig. 6(a), so that spalling will very readily occur.
  • the roll bending force applied is 90 tons and the strip width used is 7 feet. Therefore, the amount of the maximum convex . crown given to the back-up roll is naturally limited by the spalling limit, but this maximum crown amount limitedvby the spalling limit will, needless to say, be increased as the , width of the plate being rolled increases.
  • the limit for the maximum crown amount beyond which the spalling is caused is about 10 mm. Therefore, the range of the convex crown given to the back-up roll should be not larger than 10 mm in diameter in view of the crown control effect and the spalling limit of the rolls.
  • the back-up rolls are given a convex crown in view of the type of roll wears and other factors, but the crown in this case is about 0.2 mm at the largest point.
  • the controllability range of plate crown under uniform force is 50 ⁇ m or less.
  • the plate crown of hot strip mill product in the range from 0 to 60 ⁇ m so as to meet with the requirements of the subsequent cold rolling operation, and for this purpose the controllability range of plate crown under uniform force for each stand of the hot strip rolling tandem mill must be at least 60 ⁇ m with respect to a 3-foot width of plate. To achieve this range, a convex crown of at least 0.5 mm in diameter must be given to the back-up rolls.
  • the work rolls are given a convex or concave crown shape of about 0.1 mm in diameter in view of the wear and thermal expansion of the rolls.
  • the work rolls are given a large concave crown ranging from 0.15 x CBUR to 0.4 x C BUR in diameter depending on the magnitude of the convex crown given to the back-up roll.
  • Fig. 7 the controllability ranges of plate crown under uniform force from which the actual plate crown can be controlled to the range from 0 to 60 ⁇ m are shown. As shown a larger width of plate provides a wider controllability range.
  • Fig. 7.in.comparison The controllability ranges of plate crown under uniform force achieved by the work and back-up rolls with appropriate crowns according to the present invention are shown in Fig. 7.in.comparison with those achieved without giving the crown to the back-up rolls.
  • Fig. 7 when an appropriate concave crown satisfying the condition (1), depending on the magnitude of the convex crown given to the back-up rolls, a proper controllability range can oe obtained for various widths of the plates being rolled, whereby problems such as the crown being controlled only on the minus side as shown in Fig. 3 can be eliminated and the controllability range of plate crown under uniform force can be expanded substantially.
  • a shape of the roll crown various shapes such as crowns formed by straight lines (a), (b), a sine curve (c), and a parabola (d) shown in Fig. 8 may be used.
  • a concave crown shape complementary to the convex crown shapes of the back-up rolls shown in Fig. 8 may be used.
  • the crown shape as shown by (a), (b) and (e) in Fig. 8 are not desirable.
  • the desired results of the present invention can be obtained also by a rolling mill arrangement in which an intermediate roll is mounted between the work roll and the back-up roll, and the intermediate roll is given a convex crown and the work roll is given a concave crown corresponding to the magnitude of the convex crown of the intermediate roll.
  • an effective controllability range of plate crown under uniform force can be guaranteed for various widths by giving a convex crown to the back-up roll which is in contact with the work roll and giving a concave crown to the work roll depending on the magnitude of the convex crown of the back-up roll, and-at the same time a remarkable plate crown controlling effect is obtained by the roll bending.
  • a mill arrangement in which 6 to 7 stands are arranged adjacent each other is usually used.
  • the work rolls and - back-up rolls of at least one stand are given the crown configurations as defined in the present invention so as to control the plate crown of the final mill products. If the number of the stands in which the rolls are given the crown configurations according to the present invention is increased, the controlling capacity and ability are so much increased.
  • Example of the mill arrangements composed of seven stands are illustrated in Fig. 9.
  • the particulars of the mills are set forth below.
  • the rolls are crowned according to the present invention.
  • the roll stands designated (b) are conventional ones specially designed for the crown control.
  • the mill arrangements shown in Fig. 9 are used for the plate crown controlling of special grades of steel . which are very rigid and difficult to control the plate crown.
  • the conventional crown controlling rolling stands of high capital cost are arranged in the down-stream of the mill train, and the rolling stands according to the present invention are arranged in the up-stream of the train so that the capital cost as a whole is greatly reduced.
  • the desired result can be obtained by only one stand as defined by the present invention incorporated in a mill comprising a plurality of stands.
  • better results can be obtained by incorporating more than one stand according to the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Control Of Metal Rolling (AREA)
EP85102468A 1985-03-05 1985-03-05 Laminoir Expired EP0194322B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT85102468T ATE36256T1 (de) 1985-03-05 1985-03-05 Walzwerk.
EP85102468A EP0194322B1 (fr) 1985-03-05 1985-03-05 Laminoir
DE8585102468T DE3564202D1 (en) 1985-03-05 1985-03-05 A rolling mill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85102468A EP0194322B1 (fr) 1985-03-05 1985-03-05 Laminoir

Publications (2)

Publication Number Publication Date
EP0194322A1 true EP0194322A1 (fr) 1986-09-17
EP0194322B1 EP0194322B1 (fr) 1988-08-10

Family

ID=8193347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85102468A Expired EP0194322B1 (fr) 1985-03-05 1985-03-05 Laminoir

Country Status (3)

Country Link
EP (1) EP0194322B1 (fr)
AT (1) ATE36256T1 (fr)
DE (1) DE3564202D1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1452153A1 (de) * 1965-11-26 1968-12-12 Verwaltungsgesellschaft Moelle Walzwerk zur Herstellung von Flachprodukten,z.B. von Blechen und Baendern
EP0124991A1 (fr) * 1983-03-31 1984-11-14 DAVY McKEE (SHEFFIELD) LIMITED Laminoir

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1452153A1 (de) * 1965-11-26 1968-12-12 Verwaltungsgesellschaft Moelle Walzwerk zur Herstellung von Flachprodukten,z.B. von Blechen und Baendern
EP0124991A1 (fr) * 1983-03-31 1984-11-14 DAVY McKEE (SHEFFIELD) LIMITED Laminoir

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 7, no. 128 (M-220)[1273], 3rd June 1983; & JP - A - 58 47501 (MITSUBISHI JUKOGYO) 19-03-1983 *

Also Published As

Publication number Publication date
ATE36256T1 (de) 1988-08-15
DE3564202D1 (en) 1988-09-15
EP0194322B1 (fr) 1988-08-10

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