US3389588A - Apparatus for controlling the position of work rolls - Google Patents

Apparatus for controlling the position of work rolls Download PDF

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Publication number
US3389588A
US3389588A US438274A US43827465A US3389588A US 3389588 A US3389588 A US 3389588A US 438274 A US438274 A US 438274A US 43827465 A US43827465 A US 43827465A US 3389588 A US3389588 A US 3389588A
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US
United States
Prior art keywords
roll
fluid
potentiometer
spacing
signal
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
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US438274A
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English (en)
Inventor
Anthony D Reinhardt
Robert C Slifka
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United States Steel Corp
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United States Steel Corp
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Publication date
Application filed by United States Steel Corp filed Critical United States Steel Corp
Priority to US438274A priority Critical patent/US3389588A/en
Priority to NL6603124A priority patent/NL6603124A/xx
Priority to BE677593D priority patent/BE677593A/xx
Priority to ES0324006A priority patent/ES324006A1/es
Priority to FR52651A priority patent/FR1470883A/fr
Application granted granted Critical
Publication of US3389588A publication Critical patent/US3389588A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/08—Servomotor systems incorporating electrically operated control means
    • 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
    • B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
    • Y10S425/235—Calendar

Definitions

  • An apparatus for controlling the position of work rolls in a mill which includes means to obtain a signal related to the spacing between the work rolls, means to provide a command signal proportional to desired roll spacing and means to operate a fluid system responsive to a signal related to the deviation between actual and desired roll spacing so as to adjust the roll spacing.
  • the present invention relates to an apparatus for controlling the position of work rolls in a rolling mill. More particularly, the invention involves adjusting the spacing between the work rolls so as to maintain an approximate desired roll gap.
  • the thickness of the product has been determined by measuring the product after rolling and making mill adjustments as needed.
  • the present invention contemplates maintaining continuous surveillance of the roll gap and making instantaneous mill adjustments to compensate for undesirable deviations.
  • An outstanding advantage of the invention is the relative simplicity of the equipment to measure the position of work rolls in a rolling mill.
  • the invention is particularly useful in slab mills and in other mills where relatively thick product is rolled.
  • the system employed for measuring and controlling the roll position can maintain roll spacing within a tolerance of $0.025.
  • the system according to the invention is well-suited for use on rolling mills in which relatively thick product such as slabs are rolled.
  • the invention is particularly useful in conjunction with continuous metal casting oper ations.
  • continuous casting a continuous metal column of metal is produced which is passed through rolls which should be maintained at a preselected roll spacing.
  • the present invention can be employed to maintain the preselected roll gap with sufficient accuracy to produce a more uniform product.
  • a Z-high rolling stand comprising top and bottom rolls l2 and M, respectively, having shafts mounted in roll chocks 12a and 12b and 14a and 141), respectively.
  • the roll checks in turn are supported in a mill housing It) wherein they may be moved vertically to adjust the roll gap, i.e. spacing, between the rolls l2 and M. in the preferred embodiment illustrated, the position of top roll 12. is fixed within the mill housing lti, but the roll chochs 14a and ltd! of the bottom roll are supported by fluid-operated assemblies Zita and Z lb to raise and lower the bottom roll.
  • the roll gap is varied by moving roll 14 by means of the fiuidoperated cylinder-ram assemblies 29a and 201).
  • a pump 24 continuously circulates fluid to the storage reservoir 26 through a control valve 28 which is positioned in fluid line Stl.
  • the control valve 28, which is preferably an air-actuated valve produced by Republic Mfg. Co., model No. 831-1, is normally open to permit the circulation of fluid to the reservoir 26 and is closed by introducing air through line 32 via solenoid valve 34 (connected to an air supply not shown).
  • the air-actuated control valve 28 may be closed by solenoid-operated valve 34.
  • the solenoid valves used herein may be model CC20025A made by Hannifin.
  • valve 23 When valve 23 is closed, fluid from pump 24 is forced to flow through line 36 and through check valve 38 into the flow divider 4d which distributes the fluid flow into two equal components which are diverted to the two fluid-operated ram assemblies a and 20b to cause the roll 14 to move upwardly and thereby decrease the roll gap.
  • the bottom roll is lowered by energizing solenoid-operated valves 48a and dtib thereby permitting pump 60 to force pilot fluid through lines 49a and 4912 thereby applying force to hydraulic actuators which. in turn open decompression valves Ma and 44b to allow fluid from ram assemblies 201: and 20b to escape through lines 46a and 46b to the reservoir 26, thus lowering roll 14.
  • the solenoids 47a and 47b of solenoid-operated valves 48a and 48b together with the solenoid of solenoid-operated valve 34 are energized and de-energized by control relays and 57 which are contained within the bridge-balance relay 54. Relays 55 and 57 are energized by power from a transistorized amplifier also contained within bridgebalance relay 54.
  • the roll gap measuring device 22 which may be any suitable transducer but in the preferred embodiment is a spring-loaded reel-type precision potentiometer, with its wire connected between the roll chocks, receives a constant input signal and produces an output signal approximately proportional to the existing roll gap.
  • the signal sent by device 22 is only approximately proportional to the roll spacing because it actually measures the spacing between the roll chocks which may be slightly different than the spacing between the rolls. Spacing be tween the rolls will vary largely due to rolling forces which change the relative positions of the roll chocks which changes are proportional to changes in the roll gap but, in addition, because of roll Wear, deflection, etc; these latter changes will not be reflected in the signal issued by the potentiometer 22.
  • Simultaneously actuated is a circuit comprising a set-point potentiometer 56 and a retransmitting potentiometer 52 both of which are connected to a suitable device 54- for comparing values and algebraically summarizing two electrical signals.
  • a suitable device 54- for comparing values and algebraically summarizing two electrical signals is a bridge-balance relay produced by the Minneapolis-Honeywell Regulator Company, Minneapolis, Minn., identified as R7103C and described in a publication by the manufacturer identified as 95-5420.
  • the set-point potentiometer 56 has an adjustable slider arm and dial 56' to permit a manual setting of potentiometer 56 so as to provide an electrical signal to the bridge-balance relay 54 proportional to the desired roll spacing.
  • the potentiometer is properly calibrated for this purpose.
  • the retransmitting potentiometer 52 has a slider arm 52' that is mechanically linked with the arm or pen of the recorder 50 so that it assumes a position in accordance with the existing roll gap as indicated on the recorder. Any suitable recorder may be used such as the continuous-balance potentiometer type made by Minneapolis-Honeywell. In this way, the potentiometer 52 provides a signal to the relay 54 approximately proportional to the existing roll gap.
  • the bridge-balance control relay contacts receive an input from a power source through lines L and L and compare the signal from the set-point potentiometer 56 to the signal from the retransmitting potentiometer 52. These signals are of equal value when the roll spacing conforms with the desired roll gap. In that event, the bridge-balance relay 54 Will have both of its control relays, 55 and 57 and their respective circuits 54x and 54z, each of which include common line 54y deenergized, thereby causing no change in the roll gap.
  • the bridge-balance relay will be unbalanced and will energize control relay 57 which, when closed, connects the solenoid 35 associated with solenoid-operated valve 34 with the line source and the solenoid is energized to operate the valve.
  • control relay 57 which, when closed, connects the solenoid 35 associated with solenoid-operated valve 34 with the line source and the solenoid is energized to operate the valve.
  • valve 34 When valve 34 is opened, it permits air to enter through line 32 closing the air-actuated control valve 28.
  • Fluid is then forced by pump 24 through line 36, passed the spring-loaded check valve 38 into the flow divider 40 and then into lines 40a and 40b.
  • the fluid passes check valves 41a and 41b to enter the cylinder-ram assemblies 20a and 20b, thereby raising roll chocks 14a and 14b and work roll 14. This action continue-s until the desired roll gap is achieved at which time the slider arm 52 of the retransmitting potentiometer 52 is at a setting such that the signals from this potentiometer and the set-point potentiometer will balance in the relay 54 and the control relay 57 becomes de-energized.
  • De-energizing control relay 57 causes the solenoid-operated valve 34 to shift, permitting air to open valve 28 and resumes the flow of fluid through line 30 to the reservoir 26, thereby halting the flow of fluid into the cyinder-ram assemblies 20a and 20b.
  • the bridge-balance relay energizes the normally opened relay 55.
  • solenoids 47a and 47b of solenoid-operated valves 48a and 4% are electrically connected with the line source and the valves 48a and 48b are operated to open pilot-operated decompression valves 44a and 44b. This, as previously described, causes fluid to be exhausted from the cylinder-ram assemblies 20a and 20b, thereby causing the cylinder-rams and bottom roll to lower and increase the roll spacing. This action continues until the selected roll gap is achieved as indicated by the slider arm of the retransmitting potentiometer 52.
  • fluid-operating system employed in conjunction with the circuitry for sensing the approximate position of the Work rolls with respect to each other has been found to be effective for instantaneous mill adjustments.
  • the term fluid-operated system refers generally to hydraulic systems.
  • one type of valve responsive to electrical signals has been shown, i.e. the solenoid-operated valves, other valves operating under the same principle may be similarly employed, preferably other low torque rotary directional valves.
  • alternate equipment performing similar functions may be readily substituted throughout the system described herein.
  • summing or bi-stable amplifiers may be used in lieu of the bridge-balance relay.
  • other transducers, or indeed, any device which translates mechanical displacement into a proportional signal, electrical or otherwise may be used in place of the spring-loaded potentiometer 22.
  • a recorder is used to maintain a record of roll changes.
  • the recorder may be omitted and, moreover, the potentiometer 22 may be directly connected to the bridge-balance relay 54, thereby also omitting, if desired, retransmitting potentiometer 52.
  • Apparatus for controlling the position with respect to each other of work rolls in a rolling mill comprising means to obtain a first signal approximately proportional to the spacing between work rolls in a rolling mill, means to provide a command signal proportional to the desired roll spacing, means to compare said first signal and said command signal, a fluid-operated system responsive to said last-named means for increasing and decreasing roll spacing so that a desired approximate roll spacing may be maintained.
  • An apparatus for controlling the position with respect to each other of work rolls in a rolling mill comprising upper and lower work rolls, support means for said work rolls, fluid-operated rams positioned at the supports of at least one work roll in said rolling mill adapted to raise and lower said roll, means to provide a controlled supply of fluid to said fluid-operated rams, means to evacuate a controlled quantity of fluid from said fluid-operated rams, means to obtain a signal approximately proportional to the spacing between the rolls, means responsive to said signal for energizing and de-energizing said means to supply fluid to said rams and said means to evacuate fluid from said rams whereby a desired roll spacing is maintained.
  • An apparatus for controlling the position with respect to each other of work rolls in a rolling mill having upper and lower work rolls with the roll ends mounted in roll chocks and supported in a mill housing comprising a fluid-actuated cylinder-ram assembly positioned beneath the roll chock at each end of the bottom roll for raising and lowering said roll chocks and roll, first means to supply a controlled quantity of fluid to said cylinderram assemblies to raise said bottom roll and second means to withdraw a controlled quantity of fluid from said cylinder-ram assemblies to lower said bottom roll, means to obtain a first signal proportional to thespacing between the roll chocks of the top and bottom rolls, means to provide a command signal proportional to the desired roll spacing, means to compare said first signal and said command signal and to energize one of said first means and said second means to raise or lower the bottom work roll until said first signal and said command signal balance.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Metal Rolling (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
US438274A 1965-03-09 1965-03-09 Apparatus for controlling the position of work rolls Expired - Lifetime US3389588A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US438274A US3389588A (en) 1965-03-09 1965-03-09 Apparatus for controlling the position of work rolls
NL6603124A NL6603124A (OSRAM) 1965-03-09 1966-03-09
BE677593D BE677593A (OSRAM) 1965-03-09 1966-03-09
ES0324006A ES324006A1 (es) 1965-03-09 1966-03-09 Aparato para regular la posicion de los rodillos de trabajo de un laminador.
FR52651A FR1470883A (fr) 1965-03-09 1966-03-09 Appareil pour commander la position des rouleaux de laminoir

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US438274A US3389588A (en) 1965-03-09 1965-03-09 Apparatus for controlling the position of work rolls

Publications (1)

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US3389588A true US3389588A (en) 1968-06-25

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US438274A Expired - Lifetime US3389588A (en) 1965-03-09 1965-03-09 Apparatus for controlling the position of work rolls

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US (1) US3389588A (OSRAM)
BE (1) BE677593A (OSRAM)
ES (1) ES324006A1 (OSRAM)
NL (1) NL6603124A (OSRAM)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3527074A (en) * 1966-12-19 1970-09-08 Forges De La Loire Cie Des Ate Device for regulating the thickness of rolling-mill products,and rolling mills equipped therewith
US3538727A (en) * 1966-12-19 1970-11-10 Forges Cie Des Atel Device for regulating the thickness of rolling-mill products and rollingmills equipped therewith
US3546908A (en) * 1967-05-10 1970-12-15 British Aircraft Corp Ltd Hydraulically adjustable rolling mill having a transducer unaffected by piston deformation
US3662576A (en) * 1969-06-21 1972-05-16 Ver Flugtechnische Werke Control for roll gap of a rolling mill
US3693385A (en) * 1969-09-29 1972-09-26 Ube Industries Fluid control system for selectively self-adjusting mill reduction force or interworking roll distance
US3712094A (en) * 1971-02-04 1973-01-23 Lear Siegler Inc Gear rolling machine
US3817068A (en) * 1972-05-20 1974-06-18 F Meyer Roll gap and gap error monitoring device
US3936258A (en) * 1974-01-30 1976-02-03 Intercole Automation, Inc. Calender
US4167964A (en) * 1975-05-30 1979-09-18 Escher-Wyss Limited Continuous casting plant
EP0107493A3 (en) * 1982-10-22 1984-07-11 Kennecott Corporation Rolling mill for metal strip
US4514161A (en) * 1983-12-09 1985-04-30 Usm Corporation Hydraulic roll protection system
US4787835A (en) * 1987-01-27 1988-11-29 Marshall And Williams Company Nip indicator for casting machines
EP0500324A3 (en) * 1991-02-19 1992-09-30 Keiichiro Yoshida Method of and apparatus for controlling hydraulic rolling reduction in a rolling mill
US5775154A (en) * 1995-01-07 1998-07-07 Sms Schloemann-Siemag Aktiengesellschaft Method for adjusting a roll gap
US20060043624A1 (en) * 2004-08-24 2006-03-02 Downing Daniel R Calender gap control

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2903926A (en) * 1956-01-11 1959-09-15 Baldwin Lima Hamilton Corp Method and apparatus for controlling the contour of rolls in a rolling mill
US3062018A (en) * 1961-01-30 1962-11-06 Jess F Baker Method and apparatus for defrosting ice cubing machines
US3178918A (en) * 1960-11-29 1965-04-20 Asea Ab Device for setting the rolling space in a rolling mill

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2903926A (en) * 1956-01-11 1959-09-15 Baldwin Lima Hamilton Corp Method and apparatus for controlling the contour of rolls in a rolling mill
US3178918A (en) * 1960-11-29 1965-04-20 Asea Ab Device for setting the rolling space in a rolling mill
US3062018A (en) * 1961-01-30 1962-11-06 Jess F Baker Method and apparatus for defrosting ice cubing machines

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3527074A (en) * 1966-12-19 1970-09-08 Forges De La Loire Cie Des Ate Device for regulating the thickness of rolling-mill products,and rolling mills equipped therewith
US3538727A (en) * 1966-12-19 1970-11-10 Forges Cie Des Atel Device for regulating the thickness of rolling-mill products and rollingmills equipped therewith
US3546908A (en) * 1967-05-10 1970-12-15 British Aircraft Corp Ltd Hydraulically adjustable rolling mill having a transducer unaffected by piston deformation
US3662576A (en) * 1969-06-21 1972-05-16 Ver Flugtechnische Werke Control for roll gap of a rolling mill
US3693385A (en) * 1969-09-29 1972-09-26 Ube Industries Fluid control system for selectively self-adjusting mill reduction force or interworking roll distance
US3712094A (en) * 1971-02-04 1973-01-23 Lear Siegler Inc Gear rolling machine
US3817068A (en) * 1972-05-20 1974-06-18 F Meyer Roll gap and gap error monitoring device
US3936258A (en) * 1974-01-30 1976-02-03 Intercole Automation, Inc. Calender
US4167964A (en) * 1975-05-30 1979-09-18 Escher-Wyss Limited Continuous casting plant
EP0107493A3 (en) * 1982-10-22 1984-07-11 Kennecott Corporation Rolling mill for metal strip
US4481800A (en) * 1982-10-22 1984-11-13 Kennecott Corporation Cold rolling mill for metal strip
US4514161A (en) * 1983-12-09 1985-04-30 Usm Corporation Hydraulic roll protection system
US4787835A (en) * 1987-01-27 1988-11-29 Marshall And Williams Company Nip indicator for casting machines
EP0500324A3 (en) * 1991-02-19 1992-09-30 Keiichiro Yoshida Method of and apparatus for controlling hydraulic rolling reduction in a rolling mill
US5297408A (en) * 1991-02-19 1994-03-29 Keiichiro Yoshida Method of an apparatus for controlling hydraulic rolling reduction in a rolling mill
US5775154A (en) * 1995-01-07 1998-07-07 Sms Schloemann-Siemag Aktiengesellschaft Method for adjusting a roll gap
US20060043624A1 (en) * 2004-08-24 2006-03-02 Downing Daniel R Calender gap control
US7431579B2 (en) * 2004-08-24 2008-10-07 The Goodyear Tire & Rubber Company Calender gap control

Also Published As

Publication number Publication date
BE677593A (OSRAM) 1966-09-09
NL6603124A (OSRAM) 1966-09-12
ES324006A1 (es) 1966-12-16

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