US3890817A - Methods of rolling strip materials, and strip materials rolled thereby - Google Patents

Methods of rolling strip materials, and strip materials rolled thereby Download PDF

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Publication number
US3890817A
US3890817A US498549A US49854974A US3890817A US 3890817 A US3890817 A US 3890817A US 498549 A US498549 A US 498549A US 49854974 A US49854974 A US 49854974A US 3890817 A US3890817 A US 3890817A
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United States
Prior art keywords
stand
rolling
shape
mill
roll
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Expired - Lifetime
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US498549A
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English (en)
Inventor
John Wilmot Beeston
Greyham Frank Bryant
Peter David Spooner
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GE Power Resources Management Ltd
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GEC Elliott Automation Ltd
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Assigned to GENERAL ELECTRIC COMPANY, P.L.C., THE 1 STANHOPE GATE, LONDON W1A 1EH reassignment GENERAL ELECTRIC COMPANY, P.L.C., THE 1 STANHOPE GATE, LONDON W1A 1EH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GEC- ELLIOTT AUTOMATION LIMITED
Anticipated expiration legal-status Critical
Assigned to GEC ELECTRIC PROJECTS LIMITED reassignment GEC ELECTRIC PROJECTS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GENERAL ELECTRIC COMPANY, P.L.C., THE
Assigned to GEC CONTROLS LIMITED reassignment GEC CONTROLS LIMITED CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 12/20/1989 Assignors: GEC ELECTRICAL PROJECTS LIMITED
Assigned to CEGELEC CONTROLS LTD. reassignment CEGELEC CONTROLS LTD. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE ON 03/01/1991 Assignors: GEC CONTROLS LIMITED
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    • 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
    • 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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/18—Roll crown; roll profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/06—Threading
    • B21B2273/08—Threading-in or before threading-in

Definitions

  • This invention relates to methods of rolling strip material, and more particularly but not exclusively,- to rolling of metal strip, such aslsteel strip, and also to strip material rolled by these methods.
  • Shape refers to the transverse cross-section of the strip i.e. transverse gauge profile, and transverse variation in the longitudinal tension/stress pattern of the strip.'Excessive stress differences across the strip can cause buckling of the strip, i.e. manifest bad shape. If the strip is subjected to sufficient longitudinal tension, buckling may" be avoided but the potential for buckling is not necessarily eliminated, in which case the strip has Iaterit'bad shape, and may buckle for example when cut into nar- When threading strip into a mill, particularly a multistand tandem mill, for subsequent rolling to reduce gauge, the shape of the nose i.e.
  • bad nose shape may prevent the nose enteringa stand v(or automatic threading devices for a stand, where employed). The operator then has to stop the mill, cut off the bad nose, and reattempt threading. This results in undesirable scrap, and loss of mill utilisation time.
  • a method of rolling strip material in a rolling mill havingat least one adjustable rolling stand comprises the steps of:
  • stand including a. means for sequentially measuring the mill settings and data regarding the strip material to be rolled, means for calculating at least approximately the roll force to give the required gauge which should theoretically occur on the nose of the strip materialat ,each stand, and also means for calculating theoretically the roll camber at each stand;
  • c. means for comparing the calculated roll force at each stand with the determined ideal roll force at that respective stand, and if the calculated roll force differs from the determined ideal roll force sufficiently to give the'nose an unthreadable shape or a shape outside predetermined limits of badness, means for modifying the mill settings to produce a roll force and/or a roll camber for each stand which will give the nose a threadable shape or a shape within predetermined limits of badness;
  • lnterstand-tension includes the tension between the final standand the reel.
  • the mill settings which may be modified in step (0) may be roll gap, and alternatively or additionally in the case where there is provision for varying roll camber, (for example by roll-bending jacks), roll camber.
  • the roll camber calculation of step (a) may be based on a knowledge of camber built-in to the rolls of the rolling stand in question, for example by grinding dur-- ing their manufacture and roll wear during use, together with a knowledge of thermal dissipation in the rolls during working and idling periods which when applied to a mathematical model of the dynamic thermal camber of therolls, gives the instantaneous thermal camber.
  • 1 L V i The aforesaid calculations'may be performed in a computer, preferably a suitably programmed digital computer.v
  • Another aspect of the present invention comprises strip material when rolled by the above method.
  • said rolled strip material may b for example steel or aluminium.
  • the resultant shape of the coil nose after threading through a roll stand is dependent on how. close is the roll force which occurs in rolling thenosecompared with the roll force which will deform the work rolls (by bending and flattening) so as to compensate for the total camber (ground and thermal) existing on the rolls. If compensation is correct then the shape of the rolls will exactly match the incoming transverse gauge profile of the strip and perfect exit shape results. If
  • the roll force which will theoretically occur on the nose i.e. the front first few feet of the strip is calculated using known models giving roll force F as a function of inter-stand thickness during threading of the strip, inter-stand tensions, yield stress of the strip and roll gap friction.
  • the roll camber is also calculated as follows:
  • the ground camber is known for each stand from the dimensions of the rolls.
  • the thermal camber, to be added to the effect of the ground camber is then calculated as follows:
  • the thermal camber coefficient for stand i is calculated assuming that the rolls had settled down to steady state conditions i.e. as if the coil had been rolled at one per unit speed for an infinite time. 7
  • thermal camber C (t) Secondly estimates of thermal camber C (t) are calculated every 15 secs as follows:
  • C is the steady state camber/unit speed as calculated above and C... (t) is the thermal camber that would be reached running at speed (o for an infinite time.
  • the actual Thermal camber C (t) at time t is therefore given by: C "(t) l, C "(t) l C r-Az) 1 C"(z2A z) l Cm"(z-At) l Cm(- t-ZAt) i l C (t-3At) 4. All values of C and C, are updated'by shifting one value in time every 15 secs.
  • C J(t) is calculated from present and previous values of the steady state camber e.g. Cm"(t) and from previous values of the actual thermal camber i.e. Cm t-At) where A z the sampling interval of 15 secs, and l l 1 are constants.
  • the zero shape roll force per unit strip width is given by:
  • AFli is mathematically defined above and is the change in gauge force which will be made to obtain tolerable shape Mi mill modulus hi-l is entry gauge to stand i
  • Ah total thread gauge change of previous stand Ah is the total thread gauge change for stand i and is in two parts (i) the change for shape only Ah (ii) the effect of Ah
  • the mill settings for the stands of the mill can then be recalculated from the roll forces F, AF, and the gauges k h,--Ah
  • the first and last stands have roll bending jacks and the required jack forces Ji (for stand i) are given by KO KO are constants determined by the mill geometry.
  • the change of settings e.g. screw positions for rolls, roll speeds, jack forces
  • the change of settings to return to the settings appropriate to a predetermined rolling schedule are accomplished by removing the changes made at each stand in sequence as the strip enters the following stand. This then minimises the amount of off-gauge material produced.
  • the change of settings is preferably accomplished without disturbing interstand tensions, for example by employing the non-interactive gauge control methods described in Journal of The Iron and Steel Institute, Volume 209, part 11, November 1971, pages 869 to 875.
  • block 100 is the predetermined rolling schedule (i.e. interstand gauges and tensions. This could, for example, be obtained from punched paper tape or calculated by a computer programme.
  • This schedule is fed as input to a thread rollforce calculator block 101 in which the rollforce which will theoretically occur on the nose is calculated in accordance with section (a) of the above described method.
  • the nominal schedule from is also fed to a thermal camber calculator 102 which calculates the thermal camber'as described in section (a) above to be used by the zero shape rollforce calculator 103 as described in section (b) above.
  • the outputs of 101 and 103 are compared in comparator 104 as described in section (0) above and the output'of 104 is used to calculate the jack force settings and gauge changes required for threading as described in section (0) above.
  • the output programme is then used to apply these settings to mill during threading and remove them as described in section (d) above.
  • FIG. 2 shows a rolling mill with 4 stands 1 to 4, metal strips to be rolled, screws position controllers 5 to 8, speed controllers 9 to 12 and jack force controllers 13, 14.
  • the digital computer, 22, as described with reference to FIG. 1, calculates the jack forces 1,, .l and thread gauge corrections Ah which are applied to the controllers through the gain setting amplifiers 15 to 21, and summing amplifiers 23, 24.
  • the mill is equipped with automatic tension controls using the screwdowns at each stand then this can be used to remove the threading changes as the strip passes through the mill.
  • a method of rolling strip material in a rolling mill having at least one adjustable rolling stand comprises the steps of:
  • a rolling mill having at least one adjustable rolling that respective stand, and if the calculated roll stand, including force differs from the determined ideal roll force a. means for sequentially measuring the mill settings ffl i ml t i e th no e an unthreadable shape and data regarding the strip material to be rolled,
  • gil go rig2:2 :2 is:lief;i fe g gzggg vtilfiii go3;; 5 means for modifying the mill settings to produce a roll force and/or a roll camber for each stand which theoretically occur on the nose ofthe strip material will give the nose 8 threadable Shape or a shape fifii iil roll 3511 83 2? lilifi siill Within p'edete'mined t bad'tess;
  • b. means for determining at least approximately the 10 means far threacimg the smp l f" through the ideal r0 force for each Stand which with the mill and as each inter-stand tension is successively culated roll camber on the respective stand, will establishefj changing the Settings of mm to give the nose a shape threadable into a subsequent Phose Settmgs ppropnate to a predetemlmed roll rolling stand or a shape within predetermined limits mg Schedule (If not already at those settmgs); and f b d l5 means for rolling the strip material substantially 0. means for comparing the calculated roll force at according to the rolling schedule. each stand with the determined ideal roll force at

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US498549A 1973-08-23 1974-08-19 Methods of rolling strip materials, and strip materials rolled thereby Expired - Lifetime US3890817A (en)

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Application Number Priority Date Filing Date Title
GB4000073A GB1458973A (en) 1973-08-23 1973-08-23 Methods of rolling strip materials and strip materials rolled thereby apparatus for making nuts

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US3890817A true US3890817A (en) 1975-06-24

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US (1) US3890817A (US08124317-20120228-C00038.png)
JP (1) JPS5072854A (US08124317-20120228-C00038.png)
CA (1) CA1015840A (US08124317-20120228-C00038.png)
CH (1) CH603265A5 (US08124317-20120228-C00038.png)
DE (1) DE2440235A1 (US08124317-20120228-C00038.png)
FR (1) FR2241350B1 (US08124317-20120228-C00038.png)
GB (1) GB1458973A (US08124317-20120228-C00038.png)
SE (1) SE412707C (US08124317-20120228-C00038.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4126026A (en) * 1977-09-26 1978-11-21 General Electric Company Method and apparatus for providing improved automatic gage control setup in a rolling mill
CN117798191A (zh) * 2024-02-28 2024-04-02 常州市力俊机械有限公司 一种可调控黑色金属压延定位工装及使用方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0747171B2 (ja) * 1988-09-20 1995-05-24 株式会社東芝 圧延機の設定方法および装置
DE19605566A1 (de) * 1996-02-15 1997-03-27 Bosch Gmbh Robert Vorrichtung und Verfahren zum Zuführen eines plastisch verformbaren Massestrangs zu einer Bearbeitungsstation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3248916A (en) * 1962-09-21 1966-05-03 Westinghouse Electric Corp Workpiece shape control with a rolling mill
US3387470A (en) * 1965-09-28 1968-06-11 Westinghouse Electric Corp Method for measuring roll crown and improving the operation of a rolling mill
US3813908A (en) * 1972-12-18 1974-06-04 Gen Electric Method of adaptive thread
US3820711A (en) * 1971-02-16 1974-06-28 M Economopoulos Process for the predetermination of the datum values of a wide strip finishing rolling mill train controlled by an electronic calculator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1283185B (de) * 1962-10-25 1968-11-21 Verwaltungsgesellschaft Moelle Steuerung zum Einstellen des Walzenspaltes in Revesier-Walzgeruesten zum Auswalzen von Grob- und Mittelblechen
US3332263A (en) * 1963-12-10 1967-07-25 Gen Electric Computer control system for metals rolling mill
GB1256067A (en) * 1967-12-06 1971-12-08 English Electric Co Ltd Automatic control of rolling mills
US3587263A (en) * 1968-12-10 1971-06-28 Westinghouse Electric Corp Method and apparatus for steering strip material through rolling mills

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3248916A (en) * 1962-09-21 1966-05-03 Westinghouse Electric Corp Workpiece shape control with a rolling mill
US3253438A (en) * 1962-09-21 1966-05-31 Westinghouse Electric Corp Automatic strip gauge control for a rolling mill
US3387470A (en) * 1965-09-28 1968-06-11 Westinghouse Electric Corp Method for measuring roll crown and improving the operation of a rolling mill
US3820711A (en) * 1971-02-16 1974-06-28 M Economopoulos Process for the predetermination of the datum values of a wide strip finishing rolling mill train controlled by an electronic calculator
US3813908A (en) * 1972-12-18 1974-06-04 Gen Electric Method of adaptive thread

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4126026A (en) * 1977-09-26 1978-11-21 General Electric Company Method and apparatus for providing improved automatic gage control setup in a rolling mill
CN117798191A (zh) * 2024-02-28 2024-04-02 常州市力俊机械有限公司 一种可调控黑色金属压延定位工装及使用方法
CN117798191B (zh) * 2024-02-28 2024-05-10 常州市力俊机械有限公司 一种可调控黑色金属压延定位工装及使用方法

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JPS5072854A (US08124317-20120228-C00038.png) 1975-06-16
GB1458973A (en) 1976-12-22
SE7410682L (US08124317-20120228-C00038.png) 1975-02-24
DE2440235C2 (US08124317-20120228-C00038.png) 1989-11-23
SE412707C (sv) 1985-03-18
FR2241350A1 (US08124317-20120228-C00038.png) 1975-03-21
SE412707B (sv) 1980-03-17
CH603265A5 (US08124317-20120228-C00038.png) 1978-08-15
FR2241350B1 (US08124317-20120228-C00038.png) 1978-03-24
DE2440235A1 (de) 1975-02-27
CA1015840A (en) 1977-08-16

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