US3348393A - Rolling - Google Patents

Rolling Download PDF

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Publication number
US3348393A
US3348393A US302967A US30296763A US3348393A US 3348393 A US3348393 A US 3348393A US 302967 A US302967 A US 302967A US 30296763 A US30296763 A US 30296763A US 3348393 A US3348393 A US 3348393A
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Prior art keywords
pass
rolling
last
mill
slab
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Expired - Lifetime
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US302967A
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English (en)
Inventor
Peter J Shipp
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British Iron and Steel Research Association BISRA
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British Iron and Steel Research Association BISRA
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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

Definitions

  • This invention relates to rolling and more particularly but not exclusively to the rolling of steel plate from a slab.
  • Equation 6 can be used as the basis of a method of predicting the required screwdown setting in conjunction with any convenient method of measuring mill stretch.
  • One such method for example, is to relate mill stretch during a pass to the mill load experienced during that pass.
  • housing stretch which may be non-linear
  • roll deflection which depends on workpiece width
  • 1 k a constant correction which includes any zero error of the screwdown indicator, interface clearances taken up when the rolling load is applied, etc.
  • f(Lfi) the mill stretch during the one pass as herein dened.
  • r the reduction ratio at the pass to produce the predetermined length.
  • k a constant mill characteristic as herein defined.
  • the rolling load L may be calculated from the known required reduction ratio r and from the measured value of r and L for the previous pass, or from the average of the values of r and corresponding values of L measured on several preceding cross-rolling passes on the same slab.
  • the rolling load L may be calculated from the known required draft c and from the measured or calculated values of 0 and L for the previous pass, or from the average of the values of /c and L for several preceding passes.
  • the draft 0 on a pass is equal to the difference between the slab thicknesses before and after a pass.
  • the thickness after a pass is, from Equations 3 and 7, given by and the thickness before the pass is equal to the thickness issuing from the preceding pass, which can be obtained in a similar manner.
  • Equation 9 then becomes .11 1 a Sg Tgk
  • all the quantities on the right hand side of the equation are known or can be measured directly, except the factor aM.
  • the value of the factor aM for any slab we note that for any pass where the symbols have their previous significance.
  • the reduction ratio in a pass may be obtained from the slab lengths before and after the pass according to
  • the slab thickness after a pass may be obtained from Equation 2 thus where 1 is the slab length after the pass and l ,t are the corresponding length and thickness of the slab before or after one of the earlier cross-rolling passes.
  • values of r or c on any pass may be obtained from the slab thicknesses before and after the pass calculated from Equations 3 and 7. If in such a mill the cross-rolling is always finished on the same side of the mill, only one slab length measuring device need be fitted, on the side remote from the finishing side, to furnish the value 2 in Equation 9. If the cross-rolling may be finished on either side of the mill length measuring devices are required on both sides of the mill. If loadcells are not fitted to the mill, length measuring devices are required on both sides of the mill.
  • the rolling load L in a pass may be obtained by averaging an analogue or digital representation of the load obtained from commercially available loadcells already in use on steel rolling mills.
  • FIGURES 1 and 2 is a schematic diagram of a millstand.
  • FIGURE 1 shows a millstand having work rolls 2 the lower of which is bottomed against a load cell 3.
  • the upper roll is actuated by a screwdown motor and screwdown indication is provided by a position transducer 4 which may give an analogue or digital representation of the rotation of the screwdown motor or of the screwdown screw itself, such a transducer being well known.
  • a length measuring device 6 eg an English Electric Slab Length Measurer.
  • the signals derived from the load cell, position transducer and length measurer are fed to a computer which also receives the constants f(L), w and k.
  • the resultant signal is fed back to the screwdown motor.
  • FIGURE 2 is shown a similar arrangement but for the elimination of the load cell and the provision of two length measurers.
  • the comand I is not required, while the arrangement of FIGURE 2, working according to the expression requires two length measurers to provide both l and 1 (l and I).
  • a known thickness measurement device may be used, for example a rocker arm rotated by the slab and operative to set a potentiometer or a visual indicator.
  • Apparatus for controlling the setting of the roll of the last broadside pass in the rolling sequence of a roughing stand of a plate mill to produce a predetermined length (w) for the rolled material comprising means for generating an electrical signal representing the actual roll gap setting (s corresponding to the last-but-one pass, means for generating an electrical signal representing rolling load (L corresponding to the last-but-one pass, means for generating an electrical signal representing the material length (1 before said last pass, and calculating apparatus for providing an electrical signal for controlling the roll gap setting (s .for said last pass calculated in accordance with the relationship where k is a predetermined constant characteristic of the mill, f(L) is the total mill stretch calculated -in predetermined manner from the respective rolling load (L or L and r is the predicted reduction ratio for the pass to be controlled.
  • Apparatus as claimed in claim 1 in which said calculating apparatus comprises means for deriving r from the relationship 3.
  • Apparatus as claimed in claim 2 in which said calculating apparatus comprises means for deriving L from r l and r by the relationship constant with r representing the reduction ratio for the preceding pass.
  • Apparatus for controlling the setting of the roll of the last broadside pass in the rolling sequence of a roughing stand of a plate mill to produce a predetermined length (w) for the rolled material comprising means for generating an electrical signal representing the actual roll gap setting (s corresponding to the last-butwhere k is a predetermined constant characteristic of the mill,
  • M is the modulus of elasticity of the millstand
  • I is the workpiece length before the next to the last pass.
  • Apparatus as claimed in claim 4 in which said calculating means comprises means for deriving aM according to the expression in which t represents the thickness of the workpiece and means to determine r according to the expression in which 1 represents the predetermined workpiece length.
  • Apparatus according to claim 5 in which said calculating means comprises means to determine t according to the expression in which t and t represent the thickness of the workpiece before and after the last pass.
  • said calculating means comprises means to determine t according to the expression in which 1 represents the length and d the width of the workpiece after any given pass, W represents the weight of the workpiece and g represents the density of the workpiece.
  • Apparatus for rolling plate from slab comprising means for controlling the setting of the roll of the last broadside pass in the rolling sequence of a roughing stand of the plate mill to produce a predetermined length (w) for the rolled material, means for turning the rolled material through and then rolling the material to the required plate thickness, the means for controlling the setting of the roll of the last broadside pass including means for generating an electrical signal representing the actual roll gap setting (s corresponding to the last-butone pass, means for generating an electrical signal representing rolling load (L corresponding to the last-but-one pass, means for generating an electrical signal representing the material length (1 before said last pass, calculating apparatus for providing an electrical signal for controlling the roll gap setting (s for said last pas calculated in accordance with the relationship w w f 2) 2 where k is a predetermined constant characteristic of the mill, f(L) is the total mill stretch calculated in predetermined manner from the respective rolling load (L or L and r is the predicted reduction ratio for the pass to be controlled.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US302967A 1962-08-21 1963-08-19 Rolling Expired - Lifetime US3348393A (en)

Applications Claiming Priority (1)

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GB3204962 1962-08-21

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3635059A (en) * 1969-09-18 1972-01-18 Westinghouse Electric Corp Calibration of rolling mill screwdown position regulator
US20150352680A1 (en) * 2013-01-16 2015-12-10 Richard POLIQUIN An apparatus and method for manufacturing a steel component
US20220355368A1 (en) * 2019-06-21 2022-11-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. Method for producing a casting mold and mold produced using the method

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680978A (en) * 1950-07-05 1954-06-15 British Iron Steel Research Production of sheet and strip
US3039513A (en) * 1960-04-13 1962-06-19 Gpe Controls Inc Roll position control
US3081653A (en) * 1957-11-22 1963-03-19 Westinghouse Electric Corp Strip thickness control apparatus
US3104566A (en) * 1958-10-16 1963-09-24 Square D Co Rolling mill control
US3136183A (en) * 1961-08-29 1964-06-09 Gen Electric Slowdown control for reversing hot mill
US3158049A (en) * 1961-09-21 1964-11-24 Rank Precision Ind Ltd Automatic gauge control systems
US3174316A (en) * 1962-04-03 1965-03-23 Moeller & Neumann Verwalt Ges Method and apparatus for producing structural metal bars of various different commercial shapes and lengths
US3177346A (en) * 1959-11-06 1965-04-06 United Steel Companies Ltd Apparatus for use in controlling a rolling mill
US3210977A (en) * 1962-12-31 1965-10-12 Republic Steel Corp Rolling steel plate

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680978A (en) * 1950-07-05 1954-06-15 British Iron Steel Research Production of sheet and strip
US3081653A (en) * 1957-11-22 1963-03-19 Westinghouse Electric Corp Strip thickness control apparatus
US3104566A (en) * 1958-10-16 1963-09-24 Square D Co Rolling mill control
US3177346A (en) * 1959-11-06 1965-04-06 United Steel Companies Ltd Apparatus for use in controlling a rolling mill
US3039513A (en) * 1960-04-13 1962-06-19 Gpe Controls Inc Roll position control
US3136183A (en) * 1961-08-29 1964-06-09 Gen Electric Slowdown control for reversing hot mill
US3158049A (en) * 1961-09-21 1964-11-24 Rank Precision Ind Ltd Automatic gauge control systems
US3174316A (en) * 1962-04-03 1965-03-23 Moeller & Neumann Verwalt Ges Method and apparatus for producing structural metal bars of various different commercial shapes and lengths
US3210977A (en) * 1962-12-31 1965-10-12 Republic Steel Corp Rolling steel plate

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3635059A (en) * 1969-09-18 1972-01-18 Westinghouse Electric Corp Calibration of rolling mill screwdown position regulator
US20150352680A1 (en) * 2013-01-16 2015-12-10 Richard POLIQUIN An apparatus and method for manufacturing a steel component
US20220355368A1 (en) * 2019-06-21 2022-11-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. Method for producing a casting mold and mold produced using the method

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GB1043369A (sv)

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