US3035465A - Rolling mill control apparatus - Google Patents

Rolling mill control apparatus Download PDF

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Publication number
US3035465A
US3035465A US685498A US68549857A US3035465A US 3035465 A US3035465 A US 3035465A US 685498 A US685498 A US 685498A US 68549857 A US68549857 A US 68549857A US 3035465 A US3035465 A US 3035465A
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US
United States
Prior art keywords
transistor
mill
control
rolling mill
control apparatus
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
US685498A
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English (en)
Inventor
Jr Frank Di Nicolantonio
Willard M Brittain
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.)
CBS Corp
Original Assignee
Westinghouse Electric 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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US685498A priority Critical patent/US3035465A/en
Priority to FR775012A priority patent/FR1218445A/fr
Priority to JP2707258A priority patent/JPS3515161B1/ja
Application granted granted Critical
Publication of US3035465A publication Critical patent/US3035465A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/60—Roll-force control; Roll-gap control by control of a motor which drives an adjusting screw
    • 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
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/64—Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands

Definitions

  • the present invention relates, in general, to control apparatus for a rolling mill, and more particularly to control apparatus for a rolling mill wherein said control apparatus is responsive to a control signal provided by a piece of material to be rolled either entering or leaving a particular stand of said rolling mill.
  • FIGURE 1 is a schematic showing of the arrangement of the control apparatus in accordance with the present invention.
  • FIG. 2 is an electrical schematic showing of the control apparatus of the present invention.
  • FIG. 1 there is shown the housing of one stand of a rolling mill, including an upper roller member 12 and a lower roller member 14 which are adjustable in spacing as well known to persons skilled in this art by means of a screwdown device 16 for determining the thickness or gauge of a piece of material 18, such as a strip of steel, which passes between the roller members 12 and 14.
  • the screwdown device 16 is provided with a motor 2% and a screwdown motor control 22 as well known to persons skilled in this art.
  • a magnetic strain gauge 24 including a fixed E-shaped core member 26 and a movable core member 28 is provided with the center leg of the E-shaped core member 26 having wound thereon a first control winding 30, a primary winding 32 and a second control winding 34.
  • a regulated direct current voltage source 36 is connected to energize the primary winding 32.
  • the two control windings 30 and 34 are connected to provide control signals to a control device 38 operative with a relay device i) for controlling the operation of a digital programming device 42 as will be later explained.
  • the digital programming device 42 may be operative through a motor control 44 for controlling the operation of the mill motor 46 that is operative with the roller members 12 and 14.
  • Other control functions, such as controlling the screwdown motor control 22 and the like may also be performed, as will be apparent to persons skilled in this particular art.
  • FIG. 2 there is shown the voltage source 36 connected through a reactor member 50 and an adjustable resistor 52 to the primary winding 32 of the magnetic strain gauge device.
  • the first control winding 30 of the magnetic strain gauge 24- is operative with a first transistor amplifier device T which amplifies the output signal from the first control winding 30 such that it can operate a flip-flop circuit 56 including a transistor T and a transistor T
  • the second control winding 34 of the magnetic strain gauge 24 is operative with a similar transistor amplifier T
  • the transistor amplifiers T and T are temperature compensated such that the output voltage of these amplifiers will not drift too excessively during ambient temperature changes.
  • a first rate control circuit including a capacitor C and a resistor R is connected between the output of the transistor amplifier T and the base circuit of the transistor T in the flip-flop circuit 56.
  • a second rate control circuit including a capacitor C and a resistor R is connected between the output of the transistor amplifier T and the base circuit of the transistor T in the flip-flop circuit 56.
  • These rate control circuits keep the slow varying voltages from across the respective amplifiers T and T, from efiecting the operation ofthe flipfiop circuit 56.
  • the diodes 2D and 5D keep any increasing negative signals from appearing on the flip-flop circuit 56, thus protecting the flip-flop circuit 56 from damaging increasing negative signals and also to prevent the flip-flop 56 from changing its operative state for an increasing negative signal.
  • the diode 1D and resistor R are operative with the first rate control circuit including the capacitor C and resistor R to prevent the capacitor C from charging up on an increasing negative signal such that when the increasing negative signal disappears, the capacitor C will have a very small voltage which cannot change the operative state of the flip-flop 56.
  • the diode 6D and resistor R performs the same function relative to the rate circuit including the capacitor C and resistor R In the flip-flop circuit 56, the diode 4D assures that when the transistor T is not conducting it will not become conductive and the diode 3D assures that when the transistor T is not conducting it will not become conductive.
  • the transistors T and T are operative as amplifier devices for operating the relay 58.
  • the contact member 59 closes a circuit operative with the digital programming device 62 for operating, for example, the screwdown motor 20 through the screwdown motor control 22.
  • the digital programming device 62 may operate the mill motor 46 as shown in FIG. 1 for reversing the operation of the rolling mill if desired.
  • the magnetic strain gauge 24 as shown in FIG. 1 is mounted on the housing of the stand 10 of the rolling mill such that the Loom 28 is movable relative to the stationary E-core 26 and is so movable proportional to the stretch or strain in the housing 10 of the rolling mill including the roller members 12 and 14, which stretch is due to the roller pressure between the roller members 12 and 14.
  • the primary coil 32 provided on the stationary E-core 26 is operative to establish a flux level in both the movable core 28 and the stationary core 26. The flux level for the latter cores is dependent upon the number of ampere turns of the primary winding 32 and also on the gap that exists between the movable core 28 and the stationary core 26.
  • the secondary windings 30 and 34 are provided such that when a piece of material 18 enters the space between the roller members 12 and 14, or when the piece of material 18 leaves the space between the roller members 12 and 14, the gap between the stationary core 26 and movable core 28 will change. This change in gap will cause a voltage to appear on the stationary windings 30 and 34, which voltage is dependent on the equation a E- N where E is the voltage developed by the coil, N is the number of turns of the coil, and
  • M dt is the change in flux in the coil with respect to time.
  • the reactor 50 in series with the voltage source 36 and the primary winding 32 is provided to minimize any line voltage variation from effecting the voltage induced in the secondary windings 30 and 34. Since the voltage source '36 is a direct current voltage source, slow changing temperature effects relative to the gap between the movable core 28 and the stationary core 26 do not result in an appreciable induced voltage in the secondary windings 30 and 34.
  • the resulting induced voltage in the secondary windings 30 and 34 may not be sufiicient to operate the flip-flop circuit 56 directly, and thusly, the voltage signals from the respective secondary windings 30 and 34 are amplified by the respective transistor amplifiers T and T which increase the signal level out of the respective secondary windings 30 and 34 a sufiicient amount to operate the flip-flop circuit 56.
  • the rate circuits including the capacitor C and resistor R in one such circuit and the capacitor C and resistor R in the other such circuit are operative to keep slow varying voltage changes in the respective secondary windings '30 and 34 from operating the flip-flop circuit 56.
  • a control voltage is induced in the secondary winding 34 such that the base of the transistor T is made more positive with respect to emitter to thereby cause the transistor T to become more conducting.
  • a control voltage is induced in the secondary winding 30 which causes the base of the transistor T to become more negative with respect to emitter to make transistor T less conducting which causes the transistor T in the flip-flop circuit to turn On.
  • transistor T On it will make transistor T turn Off, the base of the transistor amplifier T is made more positive with respect to emitter to turn On the transistor T to thereby turn Off the transistor T and thusly deenergize the relay device 53 relative to the voltage source 61.
  • the present control apparatus may be operative with a reversing rolling mill to reduce the thickness of a steel ingot down to the size of a bloom or slab as known to persons skilled in this art.
  • the mill may require twenty passes back and forth through the mill to effect the desired reduction and size of the ingot.
  • it may be desired to accelerate the mill in response to the control signal thereby received from the strain gauge 24.
  • it may be then desirable to decelerate the mill by decreasing the speed of the mill motor 46.
  • it may be desirable to advance the digital programming device 42 to the information required for the second pass, and to reverse the operation of the mill, and to decrease the screwdown spacing through the screwdown motor control 22 and the screwdown motor 20.
  • alternating current energization of the strain gauge 24 may be suitable with a closely regulated alternating current voltage source substituted for the voltage source 36 as shown in FIGS. 1 and 2.
  • control apparatus for a rolling mill operative in one direction and in the opposite direction and including a pair of roller members operative with a piece of material
  • a roller pressure sensing device for providing a control signal having a predetermined change in value when said piece of material changes the pressure between said roller members by a given amount within a selected time period
  • a mill control device operative with said mill for changing the direction of operation of said mill
  • a rate of change device operative with said mill control device and responsive to said control signal when the value of said signal changes by said given amount within said selected period of time.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US685498A 1957-09-23 1957-09-23 Rolling mill control apparatus Expired - Lifetime US3035465A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US685498A US3035465A (en) 1957-09-23 1957-09-23 Rolling mill control apparatus
FR775012A FR1218445A (fr) 1957-09-23 1958-09-22 Appareillage de commande de laminoir
JP2707258A JPS3515161B1 (US08158827-20120417-C00057.png) 1957-09-23 1958-09-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US685498A US3035465A (en) 1957-09-23 1957-09-23 Rolling mill control apparatus

Publications (1)

Publication Number Publication Date
US3035465A true US3035465A (en) 1962-05-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US685498A Expired - Lifetime US3035465A (en) 1957-09-23 1957-09-23 Rolling mill control apparatus

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Country Link
US (1) US3035465A (US08158827-20120417-C00057.png)
JP (1) JPS3515161B1 (US08158827-20120417-C00057.png)
FR (1) FR1218445A (US08158827-20120417-C00057.png)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208252A (en) * 1962-06-22 1965-09-28 Westinghouse Electric Corp Strip thickness control apparatus
DE1285431B (de) * 1963-05-08 1968-12-19 Verwaltungsgesellschaft Moelle Induktions-Messlehre zum Einstellen und laufenden Messen des Walzspaltes in automatisch geregelten Walzgeruesten
US20090071261A1 (en) * 2007-09-17 2009-03-19 Jinan Iron And Steel Company Ltd. Mill Configured for a Thermo-mechanical Simulating Test System

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2176742A (en) * 1936-07-24 1939-10-17 Gen Electric Apparatus responsive to frequency difference
US2339359A (en) * 1941-03-20 1944-01-18 Sperry Prod Inc Apparatus for controlling sheet thickness in continuous strip mills
US2342374A (en) * 1941-03-19 1944-02-22 Sperry Prod Inc Strain gauge for rolling mills and the like
US2660077A (en) * 1946-02-02 1953-11-24 American Brass Co Apparatus for rolling sheet metal
US2708254A (en) * 1950-02-08 1955-05-10 American Brass Co Relay control system
US2726544A (en) * 1952-08-15 1955-12-13 Bendix Aviat Corp Rate of change indicator
US2819396A (en) * 1954-12-07 1958-01-07 Jerome A G Russell Electronic trigger circuit
US2820937A (en) * 1955-08-02 1958-01-21 Fogiel Max Digital to analogue converter servosystem
US2830249A (en) * 1954-03-19 1958-04-08 Cutler Hammer Inc Servomechanisms

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2176742A (en) * 1936-07-24 1939-10-17 Gen Electric Apparatus responsive to frequency difference
US2342374A (en) * 1941-03-19 1944-02-22 Sperry Prod Inc Strain gauge for rolling mills and the like
US2339359A (en) * 1941-03-20 1944-01-18 Sperry Prod Inc Apparatus for controlling sheet thickness in continuous strip mills
US2660077A (en) * 1946-02-02 1953-11-24 American Brass Co Apparatus for rolling sheet metal
US2708254A (en) * 1950-02-08 1955-05-10 American Brass Co Relay control system
US2726544A (en) * 1952-08-15 1955-12-13 Bendix Aviat Corp Rate of change indicator
US2830249A (en) * 1954-03-19 1958-04-08 Cutler Hammer Inc Servomechanisms
US2819396A (en) * 1954-12-07 1958-01-07 Jerome A G Russell Electronic trigger circuit
US2820937A (en) * 1955-08-02 1958-01-21 Fogiel Max Digital to analogue converter servosystem

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3208252A (en) * 1962-06-22 1965-09-28 Westinghouse Electric Corp Strip thickness control apparatus
DE1285431B (de) * 1963-05-08 1968-12-19 Verwaltungsgesellschaft Moelle Induktions-Messlehre zum Einstellen und laufenden Messen des Walzspaltes in automatisch geregelten Walzgeruesten
US20090071261A1 (en) * 2007-09-17 2009-03-19 Jinan Iron And Steel Company Ltd. Mill Configured for a Thermo-mechanical Simulating Test System

Also Published As

Publication number Publication date
JPS3515161B1 (US08158827-20120417-C00057.png) 1960-10-12
FR1218445A (fr) 1960-05-10

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