[go: up one dir, main page]

US3496743A - Rolling mill for producing constant gauge - Google Patents

Rolling mill for producing constant gauge Download PDF

Info

Publication number
US3496743A
US3496743A US661987A US3496743DA US3496743A US 3496743 A US3496743 A US 3496743A US 661987 A US661987 A US 661987A US 3496743D A US3496743D A US 3496743DA US 3496743 A US3496743 A US 3496743A
Authority
US
United States
Prior art keywords
force
mill
rolling
housing
roll
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
US661987A
Other languages
English (en)
Inventor
Morris Denor Stone
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.)
United Engineering and Foundry Co
Original Assignee
United Engineering and Foundry Co
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 United Engineering and Foundry Co filed Critical United Engineering and Foundry Co
Application granted granted Critical
Publication of US3496743A publication Critical patent/US3496743A/en
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEAN UNITED, INC., A CORP.OF OH
Anticipated expiration legal-status Critical
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WEAN UNITED, INC., A CORP. OH.
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis
    • B21B31/32—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis by liquid pressure, e.g. hydromechanical adjusting
    • 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 invention relates to a rolling mill of the type designed to produce a constant thickness workpiece, such as metallic strip.
  • the mill is provided with a piston cylinder assembly for subjecting a first group of mill parts, such as the bearing chock assemblies of one of the rolls, to a roll gap controlling force which is applied in a direction to resist the rolling force of the mill.
  • the cylinder is constructed and arranged so that the force difference between its total force and the rolling force is applied to a second group of mill parts, which may include a tension or compression member. In this mill construction only a portion of the housing of the mill is subject to the rolling force.
  • a rolling mill having a housing, an elongated window in said housing, a pair of rolls between which a rolling force is developed, including mounting means for each roll received in said window of said housing, wherein a portion of the housing receiving the mounting means and said mounting means is subject only to the rolling force of the mill, means arranged at one end of said window of said housing and between one of the mounting means and housing for applying to a first group of mill parts, including one of said mounting means, a substantial part of a roll ga-p controlling force, said force being applied in a direction to resist the rolling force of the mill, the force applying means being constructed and arranged so that the force differential between its total force and the rolling force is applied to a second group of mill parts, which excludes at least said other mounting means, and wherein the elastic characteristics of said two groups of mill parts have a predetermined relationship.
  • This rolling mill can be employed in combination with a control means for continually measuring the force imposed on either said first or second group of parts and varying the applying force proportional to a change in the force being imposed on said first or second group of mill parts to maintain a predetermined relationship between either of these forces and the applied force.
  • the present invention provides in a rolling mill, or like apparatus, having a housing, a pair of rolls between which a rolling force is developed including means arranged in said housing at one side thereof for applying to a first group of mill parts, including said mounting means, a substantial part of a roll gap controlling force, said roll gap controlling force being applied in a direction to resist the rolling force of the mill, the force applying means being constructed and arranged so that the force difierential between its total force and the rolling force is applied to a second group of mill parts, which excludes at least one of said mounting means, and wherein the elastic characteristics of said two groups of mill parts have a predetermined relationship, means separate from said force applying means and associated with the mounting means arranged on the side of the housing opposite said force applying means for adjusting the associated mounting means and its roll to adjust the position of the roll independent of said force applying means.
  • This rolling mill can be employed in a combination with a control means for continually measuring the force imposed on either said first or second group of parts and varying the applying force proportional to a change in the force being imposed on said first or second group of mill parts to maintain a predetermined relationship between either of these forces and the applied force.
  • said second group of mill parts comprises one or more tension rods associated with the lowest roll assembly of the mill, said tension rod subject to a tension force by said force applying means, and wherein the tension imposed on said tension rods is measured by a force measuring means.
  • a spring or equivalent device can be used in conjunction with the tension rods compressible by said rods to give added flexibility to the system.
  • a still further object of the present invention is to provide in a rolling mill of the above-described construction a readily yieldable means received in the housing of the mill and so associated with the force applying means to be subject to a compression force.
  • the housings are provided with projections having openings to which there are received a plurality of springs, one end of which engages one of the roll chocks of the roll assembly, this spring being compressed by the application of said force applying means and wherein said housing projections are in the vicinity of the work rolls of the mill.
  • housing projections are at the base of the mill wherein the springs engage a member associated with said force applying means and is compressible upon the movement thereof.
  • the yieldable means is arranged between the mill screw and a crosshead against which a compression force is exerted.
  • a still further embodiment of the present invention comprises, either at the top or bottom of a rolling mill, a pair of substantially parallel arms connectable to one of the roll chocks of the mill and extending through or alongside the housing at which place they are connected with a cross member, means for adjusting the cross member relative to the pass line of the mill in which construction the force applying means in applying a force on the roll chock to which the arms are associated imposes a tension force on said arms, a portion of which is taken into the cross member and into the housing.
  • the present invention relates to a rolling mill for producing constant gauge and, more particularly, uniformity of longitudinal gauge, such as, metallic sheet or strip. It has been well recognized for many years that the degree of gauge accuracy in a rolling mill is dependent upon the stiffness of the mill, i.e. to say, the resistance the mill has to stretch under the rolling load generated in the rolling of the material. ln this regard the art early in its history sought to add stiffness to the mill by providing one or more backup rolls for the reducing rolls. The most common for-m of such a mill is the well known and universally employed 4-high mill. While the multi-high mill improved the stillness of the rolls and, hence, of the mill and yielded a more uniform product, it leaves much to be desired.
  • FIGURE 1 is an elevational view, partly in section, of a 4-high rolling mill incorporating the features of the present invention
  • FIGURE 2 is a similar view of a second embodiment of the present invention.
  • FIGURE 3 is a further embodiment of the form illustrated in FIGURE 2;
  • FIGURE 4 is an elevational view, partly in section, of a still further embodiment of the present invention.
  • FIGURE 5 is a further embodiment of the present in vention.
  • FIGURE 6 is a typical control circuit for the mill shown in FIGURES 1-5.
  • FIGURE 1 there is shown one of the housings 10 of a 4-high mill, it being appreciated that according to normal mill construction a similar housing will be provided for the other side of the mill and that it will contain all the components of the illustrated housing.
  • the housing 10 has a window 11 into which there is received backup chocks 13 and 14 which rotatably support backup rolls 15, the backup chocks have recesses into which there is received work roll chocks 17 and 18 that rotatably support work rolls 19 and 21.
  • the upper backup chock 13 is adjustable relative to the pass line of the mill by a conventional mill screw 22 received in a nut 23 secured to the housing.
  • the motor and gear for rotating the screw are not shown since they follow conventional designs.
  • a load cell 24 for measuring the separating force of the mill.
  • the backup and work roll chocks are separated by balance cylinder assemblies 25 and 26.
  • tension rod 31 which extends downward through or alongside the mill housing and at their lower ends carry spring retainer elements 32, into which there are received compression springs 33
  • the tension rods at their lower ends and beyond the retaining elements are either enlarged to form heads, or threaded to receive nuts 34, and between the lower surfaces of the spring retainers and nuts are provided load cells 35.
  • the load cells 35 may be employed in place of the load cells 24, and are designed to measure the tension force imposed on the rods 31, and could take the form of conventional strain gauges, if such were desirable.
  • the piston cylinder assembly 29 is adapted to apply to the bottom roll 15 a force which may be identified as F.
  • F a force which may be identified as F.
  • P the rolling force
  • Q the by-pass component
  • M the spring constant of the mill composed of rolls, backup chocks, screws, and housings
  • M the spring constant for the crosshead, rods, and springs.
  • Equation 4 the relationship of the change in the rolling force P and the spring force Q to the cylinder force F in terms of Equation 1 can be written:
  • Equation 8 may be transformed to give s Mm which, substituted in Equation 6', gives s O MJ 2)
  • the spring load cells 35 will read AQ or the alternate load cell 24 under the screw will read AP, so that either one may be used during rolling as the actuating signal and the ratio of a change in force represented by AF/AP or AF/AQ must be maintained, as stated in Equation 13 to obtain constant gage control.
  • Equation 14 the reduction of the error in accordance with the Equation 14 is based upon the relationship set out in Equation 13, in which the relationship between the AF and AP or AQ is held constant when the error is made to be zero.
  • the control circuit illustrated in FIGURE 6 is designed to solve Equation 14, the value Q being derived from the load cells 35, the value F from a pressure transducer 40 connected to the cylinder 29, and the value h from the potentiometer 41 coupled to the mill screw 22 (in FIG- URE 6 the potentiometer is shown as coupled to the motor 42 that drives the screw 22).
  • the required material gauge t is set up on a manually controlled potentiometer 43.
  • Electrical signals representing h F/M 1 1 Q (MEWS) and t are summer in a summing circuit 44 to produce an error signal e, which is amplified in amplifier 45 and sent to a differentiating circuit 49, the difference signal being applied to a pressure control valve 51 in the supply line 52 of the cylinder to reduce the error signal to equal zero.
  • FIGURE 2 where there is illustrated a housing 55 having a window in which there is received backup chocks 56, the chocks adapted to rotatably support backup rolls 57, the lower chock, it being noted, is in engagement with a force applying piston cylinder assembly 58 which exerts a force greater than the rolling load.
  • the upper chock 56 is engageable by the bottom end of a screw 59 being received in a housing via a nut 61 in which the screw is driven in the usual Way.
  • the housing is provided midway between its upper and lower portion with projections 62 forming in a reduced window section to which there is received the work roll chocks 63 and, accordingly, the work rolls 64 which constitute the mill.
  • balance piston cylinder assemblies such as 65, are provided for the backup chocks and the work roll chocks so as to take up clearances prior to the material being introduced into the mill.
  • cavities 66 into which there are received readily yieldable means, such as springs 67, the bottom surface of the springs engaging enlarged heads of plunger 68 which rest on the lower backup roll chock 56.
  • F P+Q
  • F is the cylinder force
  • P the rolling force
  • Q the compression force on the spring.
  • a AP signal will be developed as in the alternate form illustarted in FIGURE 1 from a load cell 69 arranged between the screw 59 and the upper chock 56.
  • FIG- URE 2 will be similar to the arrangement in FIGURE 1.
  • FIGURE 3 which illustrates a further embodiment and a second embodiment of the principle illustrated in FIGURE 2, and in which only the lower half of the mill in FIGURE 2 is illustrated, wherein it will be noted that the projections 71 of the housing are located at the bottom of the housing. In these projections there are provided cavities 72 for receiving springs 73 as in the case of FIGURE 2. The lower end of the springs engage enlarged heads of plunger 74 which are carried by a crosshead 75 forming the cylinder of a piston cylinder assembly 76, the piston being in engagement with the bottom of the housing. Between the crosshead and the bottom chock there are provided variable spacers 77 to take care of a change in the diameter of the roll.
  • the mill arrangement in FIGURE 3, aside from the structural dilterences, is similar in operation as that disclosed with respect to the FIGURE 2 embodiment.
  • FIGURE 4 The embodiment of the present invention illustrated in FIGURE 4 will now be described. It will be appreciated that while the equipment to be discussed is arranged at the bottom of the mill, it can be just as well arranged at the top.
  • a housing 81 which has a window 82 into which there is received backup chocks 83 of a 4-high mill, backup chocks rotatably supporting backup rolls 84.
  • the backup chocks as in the case of FIGURE 1, are provided with cavities 85 into which there are received work roll chocks 86 which rotatably support work rolls 87.
  • the backup and work roll chocks are provided with the usual balance cylinder assemblies 88 and 89.
  • the upper backup chock is adapted to be adjusted by a mill screw, not shown, which is driven in the usual way.
  • the lower backup chock 83 it will be noted that it is provided with projections 91 that provide an opening for receiving the ends of the tension bars 92, the tension bars extending downward through or alongside the mill and are connected to a common crosspiece 93.
  • the crosspiece itself is movable towards and away from the rolls by a power-driven screw '94 which is connected to a worm wheel 95 driven by a worm 96, the drive for the worm not being shown.
  • the screw 94 engages the bottom of the housing 81.
  • the screw can be operated to maintain the pass line, set the initial roll gap, or change the gap during rolling.
  • FIG- URE 5 there is illustrated such an arrangement, wherein there is shown a housing 101 having a window 102 that receives the rolls shocks of a 4-high mill.
  • the upper chock is engaged by a cross member which is urged downward by a pair of force applying cylinders 104.
  • a spring 105 is rotated between the cross member and a screw 106, which is driven by a motor wheel set 107.
  • the spring and cylinder act in concert, the force of the cylinder being controlled by the signal of a load cell 108 as in the other embodiments.
  • a pair of rolls between which a rolling force is developed including mounting means for each roll received in said window of said housing, wherein a portion of the housing receiving the mounting means and at least one of said mounting means is subject only to the rolling force of the mill,
  • the force applying means being constructed and arranged so that the force differential between its total force and the rolling force is applied to a second group of mill parts, which excludes at least said other mounting means, and wherein the elastic characteristics of said two groups of mill parts have a predetermined relationship.
  • a control means for continually measuring the force imposed on either said first or second group of parts and varying the applying force proportional to a change in the force being imposed on said first or second group of mill parts to maintain a predetermined relationship be tween either of these forces and the applied force.
  • the force applying means being constructed and arranged so that the force difierential between its total force and the rolling force is applied to a second group of mill parts, which excludes at least one of said mounting means, and wherein the elastic characteristics of said two groups of mill parts have a predetermined relationship
  • a control means for continually measuring the force imposed on either said first or second group of parts and varying the applying force proportional to a change in the force being imposed on said first or second group of mill parts to maintain a predetermined relationship between either of these forces and the applied force.
  • said second group of mill parts comprises one or more tension rods associated with the lowest roll assembly of the mill, said tension rod subject to a tension force by said force applying means, and wherein the tension imposed on said tension rods is measured by a force measuring means.
  • said housing is provided with projections, openings in said projections for receiving a plurality of springs, one end of said springs engaging one of said roll chocks of the roll assembly, said springs being compressed by the application of said force applying means and wherein said housing projections are in the vicinity of the work rolls of the mill.
  • said housing is provided with projections located at the base of the mill, the projections including openings for receiving springs and wherein said springs engage a member associated with said force applying means and are compressed upon movement thereof.
  • a rolling mill comprising a pair of substantially parallel arms connectable at one of their ends to one of the roll chocks of the mill and at the other of their ends to a cross member, means for adjusting the cross member relative to the pass line of the mill in which construction the force applying means in applying a force on the roll chock to which the arms are associated imposes a tension force on said arms, a'portion of which is taken into the cross member and into the housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US661987A 1966-09-09 1967-08-21 Rolling mill for producing constant gauge Expired - Lifetime US3496743A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB40488/66A GB1194328A (en) 1966-09-09 1966-09-09 Rolling Mill for Producing Constant Gauge

Publications (1)

Publication Number Publication Date
US3496743A true US3496743A (en) 1970-02-24

Family

ID=10415151

Family Applications (1)

Application Number Title Priority Date Filing Date
US661987A Expired - Lifetime US3496743A (en) 1966-09-09 1967-08-21 Rolling mill for producing constant gauge

Country Status (5)

Country Link
US (1) US3496743A (xx)
BE (1) BE703666A (xx)
DE (1) DE1602197A1 (xx)
GB (1) GB1194328A (xx)
NL (1) NL6712126A (xx)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702554A (en) * 1970-09-18 1972-11-14 Wean United Inc Roll positioning means for a rolling mill
US3709007A (en) * 1969-11-18 1973-01-09 Mitsubishi Heavy Ind Ltd Hydraulically loaded rolling mills
US3713314A (en) * 1970-10-02 1973-01-30 Wean United Inc Retractable gauge control assembly for a rolling mill
US3757553A (en) * 1971-08-13 1973-09-11 Wean United Inc Hydraulic mills
US3766761A (en) * 1971-10-07 1973-10-23 Wean United Inc Rolling mill control
US4056140A (en) * 1976-10-20 1977-11-01 United States Steel Corporation Method and mechanism for controlling forces in a continuous-casting machine
US4202197A (en) * 1977-12-23 1980-05-13 Chelyabinsky Politekhnichesky Institut Device for controlling the thickness of strip stock being rolled
US4253322A (en) * 1979-07-23 1981-03-03 Vydrin Vladimir N Method of controlling the thickness of strip stock being rolled
USRE32048E (en) * 1979-01-11 1985-12-17 Prince Corporation Tie bar adjustment system
US20110101139A1 (en) * 2009-11-03 2011-05-05 Inoue Mfg., Inc. Roll mill with automatic control of roll-to-roll distance and inter-roll pressure

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2757831C2 (de) * 1976-12-28 1986-11-20 Čeljabinskij politechničeskij institut imeni Leninskogo Komsomola, Čeljabinsk Streifendickenregelung beim Walzen
DE3826544A1 (de) * 1988-08-04 1990-02-15 Schloemann Siemag Ag Vorrichtung zum anstellen der in einbaustuecken gelagerten walzen von walzgeruesten
DE19846900C2 (de) * 1998-10-12 2000-08-10 Thyssenkrupp Stahl Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes für abzulängende Tailored Blanks

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327508A (en) * 1963-04-10 1967-06-27 Loewy Eng Co Ltd Rolling mills

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3327508A (en) * 1963-04-10 1967-06-27 Loewy Eng Co Ltd Rolling mills

Cited By (11)

* 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
US3702554A (en) * 1970-09-18 1972-11-14 Wean United Inc Roll positioning means for a rolling mill
US3713314A (en) * 1970-10-02 1973-01-30 Wean United Inc Retractable gauge control assembly for a rolling mill
US3757553A (en) * 1971-08-13 1973-09-11 Wean United Inc Hydraulic mills
US3766761A (en) * 1971-10-07 1973-10-23 Wean United Inc Rolling mill control
US4056140A (en) * 1976-10-20 1977-11-01 United States Steel Corporation Method and mechanism for controlling forces in a continuous-casting machine
US4202197A (en) * 1977-12-23 1980-05-13 Chelyabinsky Politekhnichesky Institut Device for controlling the thickness of strip stock being rolled
USRE32048E (en) * 1979-01-11 1985-12-17 Prince Corporation Tie bar adjustment system
US4253322A (en) * 1979-07-23 1981-03-03 Vydrin Vladimir N Method of controlling the thickness of strip stock being rolled
US20110101139A1 (en) * 2009-11-03 2011-05-05 Inoue Mfg., Inc. Roll mill with automatic control of roll-to-roll distance and inter-roll pressure
US8172166B2 (en) * 2009-11-03 2012-05-08 Inoue Mfg., Inc. Roll mill with automatic control of roll-to-roll distance and inter-roll pressure

Also Published As

Publication number Publication date
DE1602197A1 (de) 1970-03-26
BE703666A (xx) 1968-03-08
GB1194328A (en) 1970-06-10
NL6712126A (xx) 1968-03-11

Similar Documents

Publication Publication Date Title
US3496743A (en) Rolling mill for producing constant gauge
US3327508A (en) Rolling mills
EP0107493A3 (en) Rolling mill for metal strip
US3531960A (en) Gauge control method for rolling mills and like apparatus
EP0035009B1 (de) Vorrichtung zum Abstützen einer Arbeitswalze einer Blechbiege- oder -richtmaschine
US3373588A (en) Crown control for rolling mill
US3596490A (en) Roll stand, with means for the fine adjustment of the rolls under rolling pressure
US3516273A (en) Strip thickness measuring device for use in a rolling mill and like apparatus
US3491571A (en) Rolling mill method and apparatus
US3657913A (en) Crown control
EP0371280B1 (de) Verfahren zum Richten von Blechen, Bändern, Tafeln, Profilen, Trägern etc.
US3285049A (en) Rolling mill with closed frames and with a control system for continuously and rapidly adjusting the roll gap
US3431762A (en) Constant gap rolling mill
US3422655A (en) Prestressed rolling mill
US3479854A (en) Rolling mills
ES336640A1 (es) Aparato para regular la separacion entre cilindros formada por los cilindros de trabajo de un cilindro laminador.
US3464245A (en) Rolling mill having a controlled hydraulic prestress range and other gap adjusting means for initial operation and for adjustment to said range
EP0698428A1 (de) Einrichtung zur Erfassung des Walzspaltes zwischen zwei Arbeitswalzen eines Walzgerüstes
JPS6239843Y2 (xx)
EP1556178B1 (de) Reibungsarmes biegesystem in einem mehrwalzen-walzgerüst
US3534577A (en) Rolling mills for rolling metal
US3492848A (en) Automatic gauge control for rolling mills
US3852984A (en) Coarse and vernier roll position system for a rolling mill
US3507139A (en) Rolling mills
AT390392B (de) Walzwerk, insbesondere kaltwalzwerk

Legal Events

Date Code Title Description
AS Assignment

Owner name: PITTSBURGH NATIONAL BANK

Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP.OF OH;REEL/FRAME:004458/0765

Effective date: 19850610

AS Assignment

Owner name: PITTSBURGH NATIONAL BANK,PENNSYLVANIA

Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP. OH.;REEL/FRAME:004792/0307

Effective date: 19860630

Owner name: PITTSBURGH NATIONAL BANK

Free format text: SECURITY INTEREST;ASSIGNOR:WEAN UNITED, INC., A CORP. OH.;REEL/FRAME:004792/0307

Effective date: 19860630