US3490256A - Control for obtaining constant gauge in a rolling mill - Google Patents

Control for obtaining constant gauge in a rolling mill Download PDF

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Publication number
US3490256A
US3490256A US3490256DA US3490256A US 3490256 A US3490256 A US 3490256A US 3490256D A US3490256D A US 3490256DA US 3490256 A US3490256 A US 3490256A
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mill
force
group
parts
signal
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Expired - Lifetime
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English (en)
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Jeremiah Wagner O'brien
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United Engineering and Foundry Co
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United Engineering and Foundry Co
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Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEAN UNITED, INC., A CORP.OF OH
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Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEAN UNITED, INC., A CORP. OH.
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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
    • B21B37/64—Mill spring or roll spring compensation systems, e.g. control of prestressed mill stands
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
    • A61J7/00—Devices for administering medicines orally, e.g. spoons; Pill counting devices; Arrangements for time indication or reminder for taking medicine
    • A61J7/04—Arrangements for time indication or reminder for taking medicine, e.g. programmed dispensers
    • A61J7/0409—Arrangements for time indication or reminder for taking medicine, e.g. programmed dispensers with timers
    • A61J7/0427—Arrangements for time indication or reminder for taking medicine, e.g. programmed dispensers with timers with direct interaction with a dispensing or delivery system
    • A61J7/0445—Arrangements for time indication or reminder for taking medicine, e.g. programmed dispensers with timers with direct interaction with a dispensing or delivery system for preventing drug dispensing during a predetermined time period

Definitions

  • the present invention provides for an improved rolling mill and control therefor which is characterized by being very economical to manufacture and maintain and capable of giving trouble-free operation even in the difiicult environment of a rolling mill plant.
  • a method and apparatus for maintaining the roll gap of a mill constant, thereby substantial constant gauge can be obtained and wherein the roll separating forces created during rolling are adapted to be transmitted to a first group of related mill parts, including first and second reducing rolls, which parts when subjected to varying separating forces have a variable effective length, the change of which represents an undesirable change in the roll gap by reason of the displacement of the rolls and wherein a controlled force is transmitted to a second group of related mill parts which, when subjected to such a force, has a variable effective length, the algebraic sum of said controlled force being exerted in a direction opposing the separating force and being greater than the separating force, and wherein the controlled force is varied in a manner to change the effective length of the second group of mill parts to com pensate for the change in length of the first group, thereby to move the second roll relative to said first roll to maintain the roll gap substantially constant.
  • means separate from the force applicator is provided to set the initial desired gap of the mill rolls.
  • FIGURE 1 is an elevational view, partly in section, of one embodiment of the present invention.
  • FIGURE 2 is a sectional view taken on lines IIII of FIGURE 1;
  • FIGURE 3 is a modification of the mill shown in FIG- URES l and 2, showing the employment of an inherent elastic member in the group of mill parts associated with the prestressing means;
  • FIGURE 4 represents an electrical diagram of a control for use in practicing the present invention in the form illustrated in the previous figures.
  • FIGURE 5 is an elevational view, partly in section, of a still further embodiment of the present invention.
  • FIGURES 1 and 2 which illustrate the preferred arrangement of the present invention
  • a rolling mill consisting of a pair of upright housings, one of which, 10, is only illustrated, it being understood that the housings with their components are identical in structure.
  • the housing has a window 11 into which there is received upper and lower backup rolls 12 and 13 having chocks 14 and 15, respectively, the chocks having opposed openings 16 into which there are received the chocks 17 and 18 of work rolls 19 and 20, respectively.
  • the backup chocks 14 and are urged away from each other in the usual manner by roll balance piston cylinder assemblies 21, as are the working rolls by roll balance piston cylinder assemblies 22.
  • the lower backup chock is associated with a force applicator in the form of a piston cylinder assembly 23 located at the bottom of the mill having a piston 24 which engages the lower surface of the lower backup chock 15 through a spherical connection.
  • the piston cylinder assembly is connected to a fluid power source capable of exerting a variable force in excess of the separating force.
  • the upper backup chock 14 is provided with parallel openings 27, a continuation of which extends through the top of the mill and through which are inserted rods 31, the lower ends having threaded portions 32 which are received in nuts 33 non-rotatably mounted in the housing 10.
  • the lower ends of the rods 31 engage elongated compression bars 34 which are received in the chock opening 27 and extend to the lower backup chock 15, which they forcibly contact.
  • the upper end of the rods 31 are drivenly associated with a common motor 35, the motor driving through a set of spindles 36 which are associated with worm-wheel units 37 and 38 which serve to transmit the power of the motor to the rods 31.
  • a similar motor-wheel arrangement will be provided for the other housing and that the gear units will be interconnected to assure synchronous operation of the screwdown arrangement for both housings.
  • the present invention contemplates a mill construction and control that will automatically compensate for the elastic change in the characteristics of the mill components which takes place as the separating force changes.
  • the present invention stems from a discovery that the roll gap of the mill can be maintained constant automatically if various parts of the mill are arranged tofunction in interrelated but different groups, one group being subject to the separating force which Will result in an elastic change of its effective length and wherein the other group is subject to a controlled force, which force is applied in a direction opposing the separating force and of a magnitude sufiicient to change the efiective length of the second group of mill parts an amount sufficient to compensate for the change in length of the first group of mill parts.
  • FIGURE 3 while not considered necessary in all forms of the present invention, it is advantageous to provide in the mill readily yieldable members which will allow a relatively high elastic characteristic of the elements of the mill associated with the controlled piston cylinder assembly 23.
  • a verysimple and trouble-free arrangement includes springs located in the group of mill parts to which the controlled force is applied.
  • an opening 39 in the mill lower backup chocks 15 into which is received a spring 40 the spring having a plunger 41 with an enlarged head 42 including a spherical recess to which is received the end of the associated compression bar 34.
  • this arrangement a very simple construction to enable the modulus of the backup chock 15, bars 34, rods 31 and nuts 33 to be kept at a predetermined low value in accordance with the aforesaid objective.
  • a potentiometer 46 which is manually adjusted to produce a signal representing the quantity M of Equation N0. 2 which is sent to a summation amplifier 47, the summation amplifier 47 also receives signals from potentiometers 48 and 49 representing certain variable elastic characteristics of the roll and strip, such as, in the first case, change in size of the roll diameters and, in the second, strip width which influence the stretch of the mill.
  • the amplifier 47 produces a modified signal representing the corrected value for the M quantity which is received by a dividing amplifier 51.
  • This amplifier 51 also receives from a manually adjustable potentiometer 52 a signal representing the quantity M of Equation No. 2.
  • the dividing amplifier 51 produces a signal representing Y which, as previously noted, equals M /M and sends the signal to a dividing amplifier 53.
  • the dividing amplifier 53 also receives a signal from a manually operated potentiometer 54, the signal representing a value V.
  • the signal from the amplifier 53 which is represented by a quantity Y/V is sent to an amplifier 55.
  • This amplifier receives from a secondary amplifier 56, a quantity 1/V, it being noted that the amplifier 56 receives a signal representing the quantity V from the potentiometer 54.
  • the amplifier 55 adds the values Y 1 (rm) and sends a signal to a multiplying amplifier 57, which also receives a signal of the value V from the potentiometer 54.
  • the amplifier 57 accordingly, produces a signal equaling the value Y-l-l from the input signals representing v It should be noted that there are other ways to establish Y+1 and feed its signal into the system.
  • the amplifiers 55-57 are employed to produce the quantities of Equation No. 1: Y+l, which signal is sent from the amplifier 57 to a summation amplifier 58.
  • This amplifier also receives a second signal representing the rolling pressure P.
  • the load cell 26 sends a signal to a secondary amplifier 59 and also sends a signal to an amplifier 62 which receives a second signal from a manually operated potentiometer 63.
  • the amplifier 62 sends its signal to a relay 64 which has a normally open contact and a normally closed contact, 64a and 64b, respectively, as shown.
  • the potentiometer 66 produces a signal representing V so that in the event that the value P iszero or below a predetermined pressure, then the signal V represents the pressure of P.
  • Relay 64 applies either the P or V signal to the amplifier 59 depending on the output from the load cell. Accordingly, the amplifier 59 produces a signal; either P or V and sends its signal to the amplifier 58'.
  • the amplifier 58 produces a signal normally representing P(Y+1), which is sent to a solenoid 67 which operates a valve 68 that controls the pressure in the piston cylinder assembly 23 arranged at the bottom of the housing 10.
  • FIGURE 4 is of the typical, well-known design as exemplified in a publication by Kern and Korn, entitled Electric Analog Computers, published by McGraw-Hill, 1952.
  • the values of the various manual potentiometers such as 46, 48, 49, 52, 54, 63, and 66 will be predetermined and the load cell 26 will produce a signal proportional to the actual separating force of the mill so that the pressure of the cylinder 23 which is represented by the quantity F of Equation #1 will be changed pursuant to the change in the separating force an amount necessary to compensate for any change in the effective length of the mill parts represented by the Y quantity.
  • FIGURE 5 the arrangement illustrated differs from that of FIGURES 1 and 2 in that instead of the parallel screws, a single mill screw is provided for each housing. Accordingly, there is provided in the housing 70 openings 72 in the upper backup chocks 73 to which there is received force transmission bars 74, the bars extending between the lower backup chock 75 and the top of the housing 70, for which purpose there is provided on the housing lugs 76 which are engageable by the upper ends of the bars.
  • the upper backup chock 73 carries a load cell 77 as do the previous mill arrangements, the upper ends of the load cell being engaged by a screw 78 which is readily received in a nut 79 nonrotatably carried by the housing 70.
  • the screwdown nut 79 arrangement illustrated in FIG- URE 5 is similar to present-day mill construction. Accordingly, the screw is adapted to be rotated by a worm wheel unit 80, the worm being driven by a motor, not shown.
  • a rolling mill for controlling the roll gap formed by working rolls thereof comprising:
  • said first group of mill parts including the working rolls, which parts when subject to the varying separating force have a variable eifective length causing a corresponding variation in the roll gap
  • a second group of related mill parts which include a member not included in the first group of mill parts, said parts constructed and arranged to have a variable eifective length when subject to a force
  • said force applicator means exerting its force in a direction opposing said separating force and in which the algebraic sum of the forces applied to said first and second groups of mill parts is at all times greater than the separating force
  • said member of said second group of mill parts being constructed and arranged to be subject only to the difference between the separating force and the controlled force
  • said working rolls constituting a part of a first group of related mill parts adapted to receive the separating force developed by the working rolls in reducing the material
  • said first group of mill parts being characterized by the fact that when subject to the varying separating force they have a variable effective length causing a corresponding variation in the roll gap,
  • force applicator means for developing a force of a magnitude greater than the separating force and in a direction opposing the separating force, being constructed and arranged to move at least one of the rolls of the mill to vary the gap thereof,
  • a fourth signal generating means adapted to produce a signal representing the modulus of the first group of mill parts
  • a fifth signal generating means for producing a signal representing the modulus of the second group of mill parts
  • said means for producing said second signal including means for establishing a ratio between said fourth and fifth signals, and producing said third signal
  • said second group of mill parts includes force transmission bars engageable with a first chock assembly of a roll on the end of the mill on which the force applicator means is located, said bars being unconnected with a secondary chock assembly of a roll on the opposite end of the mill, and engageable with said housing on that end and adapted to resist the prestressing force.
  • said second group of mill parts including the lower backup roll chocks
  • said means responsive to a change in the separating .force being arranged between the upper backup checks and the housings.
  • said second group of mill parts includes a readily yieldable means, whereby said second group is characterized by a low modulus or spring coefficient as compared to the first group of mill parts.
  • said second group of mill parts includes a readily yieldable means arranged to engage said transmission bars and to be subject to force transmitted thereby.
  • said force applicator means being arranged to maintain the stretch of the housing constant.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US3490256D 1966-02-10 1967-01-24 Control for obtaining constant gauge in a rolling mill Expired - Lifetime US3490256A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB597466A GB1176132A (en) 1966-02-10 1966-02-10 Improvements in a Rolling Mill and Control for obtaining Constant Gauge

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US3490256A true US3490256A (en) 1970-01-20

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US (1) US3490256A (no)
BE (1) BE693944A (no)
DE (1) DE1602186A1 (no)
ES (1) ES336640A1 (no)
FR (1) FR1511243A (no)
GB (1) GB1176132A (no)
NL (1) NL6701957A (no)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709007A (en) * 1969-11-18 1973-01-09 Mitsubishi Heavy Ind Ltd Hydraulically loaded rolling mills
US3874211A (en) * 1973-03-02 1975-04-01 Sumitomo Metal Ind Method of controlling the wall thickness within a tube elongater by utilizing a screw down control
US4102171A (en) * 1977-06-12 1978-07-25 Marotta Scientific Controls, Inc. Load transfer block for rolling mills
FR2517993A1 (fr) * 1981-12-09 1983-06-17 Okun David Cage a cylindres de laminoir
US5983694A (en) * 1998-05-28 1999-11-16 Morgan Construction Company Rolling mill roll stand
CN102601122A (zh) * 2012-03-13 2012-07-25 西安交通大学 一种主传动与两轧辊径向间距调整的交流直驱伺服装置
CN102699034A (zh) * 2012-05-31 2012-10-03 天津助友重工机器设备制造有限公司 一种三辊型钢轧机压上装置总成
CN101934290B (zh) * 2009-06-30 2014-04-16 上海宝信软件股份有限公司 不锈钢冷连轧负荷分配调整方法
ITMO20130309A1 (it) * 2013-11-11 2015-05-12 Kemet Electronics Italia S R L Apparato di laminazione

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124982A (en) * 1959-11-05 1964-03-17 Rolling mill and control system
GB955164A (en) * 1963-04-10 1964-04-15 Loewy Eng Co Ltd Improvements in and relating to rolling mills
US3247697A (en) * 1962-12-06 1966-04-26 Blaw Knox Co Strip rolling mill
US3362204A (en) * 1964-04-21 1968-01-09 Pittsburgh Steel Foundry & Mac Hydraulic rolling mills

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124982A (en) * 1959-11-05 1964-03-17 Rolling mill and control system
US3247697A (en) * 1962-12-06 1966-04-26 Blaw Knox Co Strip rolling mill
GB955164A (en) * 1963-04-10 1964-04-15 Loewy Eng Co Ltd Improvements in and relating to rolling mills
US3327508A (en) * 1963-04-10 1967-06-27 Loewy Eng Co Ltd Rolling mills
US3362204A (en) * 1964-04-21 1968-01-09 Pittsburgh Steel Foundry & Mac Hydraulic rolling mills

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709007A (en) * 1969-11-18 1973-01-09 Mitsubishi Heavy Ind Ltd Hydraulically loaded rolling mills
US3874211A (en) * 1973-03-02 1975-04-01 Sumitomo Metal Ind Method of controlling the wall thickness within a tube elongater by utilizing a screw down control
US4102171A (en) * 1977-06-12 1978-07-25 Marotta Scientific Controls, Inc. Load transfer block for rolling mills
FR2517993A1 (fr) * 1981-12-09 1983-06-17 Okun David Cage a cylindres de laminoir
US5983694A (en) * 1998-05-28 1999-11-16 Morgan Construction Company Rolling mill roll stand
CN101934290B (zh) * 2009-06-30 2014-04-16 上海宝信软件股份有限公司 不锈钢冷连轧负荷分配调整方法
CN102601122A (zh) * 2012-03-13 2012-07-25 西安交通大学 一种主传动与两轧辊径向间距调整的交流直驱伺服装置
CN102601122B (zh) * 2012-03-13 2014-10-15 西安交通大学 一种主传动与两轧辊径向间距调整的交流直驱伺服装置
CN102699034A (zh) * 2012-05-31 2012-10-03 天津助友重工机器设备制造有限公司 一种三辊型钢轧机压上装置总成
ITMO20130309A1 (it) * 2013-11-11 2015-05-12 Kemet Electronics Italia S R L Apparato di laminazione
WO2015068140A1 (en) * 2013-11-11 2015-05-14 Manz Italy S.R.L. Laminating apparatus
US10128527B2 (en) 2013-11-11 2018-11-13 Manz Italy S.R.L. Laminating apparatus

Also Published As

Publication number Publication date
BE693944A (no) 1967-08-10
ES336640A1 (es) 1968-04-01
GB1176132A (en) 1970-01-01
FR1511243A (fr) 1968-01-26
NL6701957A (no) 1967-08-11
DE1602186A1 (de) 1970-04-02

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