US3327508A - Rolling mills - Google Patents

Rolling mills Download PDF

Info

Publication number
US3327508A
US3327508A US358665A US35866564A US3327508A US 3327508 A US3327508 A US 3327508A US 358665 A US358665 A US 358665A US 35866564 A US35866564 A US 35866564A US 3327508 A US3327508 A US 3327508A
Authority
US
United States
Prior art keywords
roll
stressing
assemblies
mill
rolling
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
US358665A
Other languages
English (en)
Inventor
Brown Robert
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.)
Loewy Engineering Co Ltd
Original Assignee
Loewy Engineering Co Ltd
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 Loewy Engineering Co Ltd filed Critical Loewy Engineering Co Ltd
Application granted granted Critical
Publication of US3327508A publication Critical patent/US3327508A/en
Anticipated expiration legal-status Critical
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
    • 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
    • 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
    • B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
    • B21B2203/36—Spacers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/08—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring roll-force

Definitions

  • the invention relates in particular to rolling mills for sheet or strip material having means for subjecting them to a pre-stressing force which at all times during the operation of the mill is greater than the separating force produced by the material which is in the gap between the working rolls of the mill.
  • These rolling mills have two roll-assemblies of which each includes a working roll and may also include one or more backing rolls.
  • the pre-stressing force may be produced in such a mill by one or more hydraulic cylinder-and-ram units, built into the frame of the mill. Usually each of the two housings of the mill has its own hydraulic pre-stressing unit.
  • spacing means In a mill of this type, spacing means have to be provided for keeping the axes of the working rolls at a preset distance from each other and thereby determining the size of the roll-gap and the thickness of the material which passes therethrough. These spacing means are subjected during a rolling operation to a force which is equal to the difference between the pre-st'ressing force and the separating force.
  • the separating force is known to vary frequently from one rolling operation to the next or even during one and the same operation. The reason for these variations is changes in the condition of the rolled material, e.g., changes in its temperature or hardness.
  • Variations in the separating force result in corresponding variations in the diiference between the pre-stressing force and the separating force, provided that the pre-stressing force is kept constant at all times. These variations cause the spacing means to stretch by varying amounts and thus interfere with the pre-set gap between the working rolls. This is undesirable because it leads to the production of material of uneven thickness.
  • the spacing means which determine the distance between the axes of the working rolls are in the form of spindles which are threaded into the bearing chocks of one roll-assembly and abut against load meters placed on top of the bearing chocks of the other roll-assembly.
  • the spindles can be displaced for the purpose of adjusting the size of the roll-gap by an electric motor through reduction gears built into the mill.
  • the load meters may be of the type comprising pressure-responsive cells.
  • the rolling mill of the present invention is similar in its major aspects to the mill described in British patent specification No. 955,164 in that there are provided in that mill means for pre-stressiug the mill and for controlling the pre-stressing force in response to changes in the separating force measured by load meters, so that the difference between the two forces is substantially constant at all times, with the result that the spacing means are subjected to a substantially constant force during a rolling operation and that the size of the gap between the working trolls is maintained substantially constant as well.
  • the object of the present invention is to provide a rolling mill as described above which is of simpler design than that of British patent specification No. 5 ,164.
  • spacer rods serve the purpose of keeping the first roll-assembly apart from the second roll-assembly and of transmitting the forces acting between the roll-assemblies to the load cells. Relative adjustment of the two -roll-assemblies is eifected not by the spacer rods but by separate means which act direct on the bearing chocks of one of the roll-assemblies. This is preferably the rollassembly which is by-passed by the spacer rods.
  • the relative adjustment of the two roll-assemblies may be effected by additional hydraulic units which act direct on the bearing chocks of one of the roll-assemblies. This may be the roll-assembly whose bearing chocks are bypassed by the spacer rods.
  • the relative adjustment of the roll-assemblies can then be changed by changing the volume of hydraulic fiuid in the hydraulic adjustment units.
  • the pressure fluid is taken from a separate cylinder having a piston which can be accurately displaced in either direction, e.g., by means of a motor-driven reduction gear which acts on the piston rod.
  • FIG. 1 is a section along line I--I of FIG. 2.
  • FIG. 2 is a front elevation of a rolling mill in accordance with the present invention.
  • the rolling mill illustrated in the drawings comprises two housings 10 and is fitted with two roll-assemblies, each including a working roll 11 and a backing roll 12.
  • Means for pre-stressing the mill are arranged in the lower part of each housing and consist of a hydraulic cylinder 13 and a ram 14.
  • the rams form part of the housings, and the cylinders are formed in blocks 15 which are displaceable and guided in Windows 16 of the respective housings 10.
  • Another cylinder 17 of somewhat smaller size than the cylinder 13 is formed in each block 15, and a ram 18 is displaceable in each of the last-mentioned cylinders, a cylinder 17 and a ram 18 forming together a unit for the adjustment of the two roll-assemblies 11, 12 relative to each other.
  • the rams 18 support bearing chocks 19 of the lower backing roll 12. These chocks are guided in the windows 16.
  • the bearing chocks 29 of the upper backing roll 12 abut from below against the upper ends of the housings 10, blocks 21 being interposed between the bearing chocks 20 and the housings.
  • the height of the blocks 21 may be adjustable for the initial setting of the roll-gap.
  • the bearing chocks 19 and 20 have recesses 22 and 23 at their ends facing each other, and bearing chocks 24 and 25 respectively for the working rolls 11 are accommodated in these recesses.
  • Adjustment in height of the lower working roll 11, and therefore also of the opening between the two working rolls, is obtained by the admission or release of pressure fluid contained in the cylinders 17.
  • the rods 27 pass freely through the bearing chocks 19, the latter can move relatively to these rods during adjustment of the roll-gap.
  • the pre-stressing force will be transmitted from these units to the blocks 15, from there to the load cells 26, to the spacer rods 27, to the bearing chocks 20, and to the top of the housings 10; at the same time, the reaction of the pre-stressing force will be transmitted directly from the rams 14 to the lower end of these housings.
  • the spacer rods 27 have then to take the full pre-stressing force.
  • the spacer rods have only to take the difference between the prestressing force and the roll-separating force, and this difference acts on the load meters.
  • the load-meters are preferably of the type having pressure-responsive cells in which changes in pressure are transformed into electric signals. These signals are utilised for controlling the pressure of the hydraulic units 13, 14 in a manner similar to that described in British patent speecification No. 955,164.
  • the signals are fed into an amplifier 28 and from there to a servomotor 29 for a pressure relief valve 30. This valve is in a by-pass of a hydraulic line leading from a pump P to the cylinders 13 of the hydraulic pre-stressing units.
  • the above-described control circuit, the relief valve and the pump P are common to the units 13, 14 of both housings 10.
  • the hydraulic fluid from the cylinders 17 is taken from one or more displacement cylinders 31 having a ram 32.
  • the ram is threaded over a spindle 33 driven by a motor 34.
  • Separate cylinders 31 and rams 32 may be arranged for each of the cylinders 17. In this way, it is possible to adjust the position of the rams 32 relative to the cylinders 31 with great accuracy, and thus to regulate within close limits the amount of pressure fluid contained in the cylinders 17. This, again, provides adjustment of the roll-gap between the working rolls 11 within close limits.
  • the two groups of hydraulic units 13, 14 and 17, 18 respectively are arranged in the lower part of the housings 10 where they are easily accessible for maintenance and other purposes.
  • the pipes which supply hydraulic fluid to these units can also be kept relatively short.
  • the invention can also be applied to rolling mills without backing rolls.
  • the bearing checks for' the working rolls take the place of the bearing chocks for the backing rolls in the example described.
  • a rolling mill for rolling flat products having two roll-assemblies each having a working roll, spacing means for maintaining a pre-set distance between said working rolls, means for adjusting the distance between said working rolls separate from said spacing means, pre-stressing means for the mill, load meters measuring the load in said spacing means, control means for varying the pre-stressing force and responsive to the output from said load meters, said spacing means being formed by rods interposed between one of the roll-assemblies and said load meters, said load meters being interposed in turn between said spacing means and said pre-stressing means and said adjusting means interposed between the other roll-assembly and the pre-stressing means.
  • a rolling mill for rolling fiat products comprising two housings, two roll-assemblies each comprising a working roll and roll-bearing means for supporting a roll-assembly in said housings, spacing means for maintaining a pre-set distance between said working rolls for the passage therethrough of the rolled product, means for adjusting the distance between said working rolls and acting directly on the roll-bearing means of one roll-assembly,
  • pre-stressing means interposed between said adjusting means and said housings, load meters interposed between said spacing means and said pro-stressing means, and control means for varying the pre-stressing force in response to the output from said load meters, said spacing means being formed by rods abutting with one of their ends against the load meters and with the other end against the bearing means of one roll-assembly and by-passing the bearing means of the other roll-assembly,
  • a rolling mill for rollingfiat products having two housings, two superposed roll-assemblies defining between themselves a gap for the passage therethrough of the rolled product, bearing means for supporting said rollassemblies in said housings, means for placing said housings and said bearing means under a pro-stressing force, means for adjusting the gap between said roll-assemblies and acting on the bearing means of the lower one of said roll-assemblies, rods supporting the bearing means of the upper one of said roll-assemblies and bypassing the bearing means of the lower roll-assembly, load meters measuring the load in said spacing means, and control means for adjusting the pre-stressing force in response to the output from said load meters.
  • a rolling mill for rolling fiat products having two superposed roll-assemblies defining between themselves a gap for the passage therethrough of the rolled product, bearing means for supporting said roll-assemblies in said housings, means for placing said housings and said bearing means under a pre-stressing force, said pre-stressing means comprising hydraulic cylinder-and-ram units, means for adjusting the gap between said roll-assemblies.
  • a rolling mill according to claim 5 having load meters interposed between said spacing means and said blocks, and control means for varying the pressure in said pre-stressing units in response to the output of said load meters.
  • a rolling mill having adjusting means comprising hydraulic cylinder and ram units, and at least one metering cylinder connected to the cylinders of the hydraulic adjusting units, a ram displaceable in said metering cylinder and means for adjusting the position of said ram relative to said metering cylinder.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US358665A 1963-04-10 1964-04-09 Rolling mills Expired - Lifetime US3327508A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB14304/63A GB1012853A (en) 1963-04-10 1963-04-10 Improvements in and relating to rolling mills

Publications (1)

Publication Number Publication Date
US3327508A true US3327508A (en) 1967-06-27

Family

ID=10038763

Family Applications (1)

Application Number Title Priority Date Filing Date
US358665A Expired - Lifetime US3327508A (en) 1963-04-10 1964-04-09 Rolling mills

Country Status (4)

Country Link
US (1) US3327508A (enrdf_load_html_response)
DE (1) DE1285970C2 (enrdf_load_html_response)
FR (2) FR1338908A (enrdf_load_html_response)
GB (2) GB955164A (enrdf_load_html_response)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416341A (en) * 1966-12-12 1968-12-17 Kaiser Aluminium Chem Corp Rolling mill control system
US3427839A (en) * 1960-03-14 1969-02-18 Moeller & Neumann Verwalt Ges Hydraulic adjusting means for rolling mills
US3464245A (en) * 1965-05-03 1969-09-02 Davy & United Eng Co Ltd Rolling mill having a controlled hydraulic prestress range and other gap adjusting means for initial operation and for adjustment to said range
US3490256A (en) * 1966-02-10 1970-01-20 United Eng Foundry Co Control for obtaining constant gauge in a rolling mill
US3491571A (en) * 1966-02-14 1970-01-27 United Eng Foundry Co Rolling mill method and apparatus
US3492848A (en) * 1966-09-19 1970-02-03 United Eng Foundry Co Automatic gauge control for rolling mills
US3496743A (en) * 1966-09-09 1970-02-24 United Eng Foundry Co Rolling mill for producing constant gauge
US3507139A (en) * 1967-05-17 1970-04-21 Davy & United Eng Co Ltd Rolling mills
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
US3533255A (en) * 1965-08-24 1970-10-13 Raymond Bernard Sims Rolling mill
US3537285A (en) * 1964-12-22 1970-11-03 Davy & United Eng Co Ltd Prestressed rolling mill and control
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
US3709007A (en) * 1969-11-18 1973-01-09 Mitsubishi Heavy Ind Ltd Hydraulically loaded rolling mills
DE2515015A1 (de) * 1975-04-07 1976-10-21 Schloemann Siemag Ag Quarto-walzgeruest
US4087999A (en) * 1976-11-24 1978-05-09 Vydrin Vladimir Nikolaevich Device for automatic adjustment of roll gap in mill stand
US4380954A (en) * 1980-02-28 1983-04-26 Kleinewefers Gmbh Method and apparatus for controlling the pressure exerted on a material web in the roller nip of a rolling mill

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR85591E (enrdf_load_html_response) * 1963-04-10 1965-12-10
FR1362076A (fr) * 1963-04-19 1964-05-29 Spidem Ste Nle Laminoir réversible à double mouvement de serrage
DE1301787B (de) * 1963-06-20 1969-08-28 Loewy Eng Co Ltd Walzwerk mit zwischen den oberen und unteren Einbaustuecken eingesetzten Distanzstuecken
DE1427879A1 (de) * 1964-04-29 1970-02-26 Froehling Fa Josef Vorgespanntes Walzgeruest
GB1155013A (en) * 1965-07-05 1969-06-11 United Eng Foundry Co Rolling Mill
GB1114778A (en) * 1965-09-17 1968-05-22 Loewy Eng Co Ltd Pre-stressed rolling mill
GB1161318A (en) * 1965-11-15 1969-08-13 Davy & United Eng Co Ltd Rolling Mills
DE2111608A1 (de) * 1971-03-11 1972-09-14 Ishikawajima Harima Heavy Ind Regeleinrichtung fuer ein hydraulisches Walzwerk
GB8309021D0 (en) * 1983-03-31 1983-05-11 Davy Mckee Sheffield Rolling mill
AT390573B (de) * 1988-05-13 1990-05-25 Voest Alpine Ind Anlagen Vorrichtung zum befestigen eines walzringes auf einer walzenwelle

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1669550A (en) * 1926-04-01 1928-05-15 United Eng Foundry Co Rolling mill and method of rolling
US2345931A (en) * 1941-12-11 1944-04-04 Major E Gates Controlling apparatus
GB728012A (en) * 1952-01-18 1955-04-13 Sandvikens Jernverks Ab Rolling mill
US3024679A (en) * 1957-07-01 1962-03-13 Thomas A Fox Skin pass mills and methods of rolling
US3124982A (en) * 1959-11-05 1964-03-17 Rolling mill and control system
CA683660A (en) * 1964-04-07 A. Fox Thomas Rolling mill structures
GB955164A (en) * 1963-04-10 1964-04-15 Loewy Eng Co Ltd Improvements in and relating to rolling mills
CA701014A (en) * 1964-12-29 Verwaltungsgesellschaft Moeller U. Neumann Offene Handelsgesellschaft Elimination of excentricity in rolling mills
US3191408A (en) * 1962-02-08 1965-06-29 Blaw Knox Co Hydraulic pressure regulating system for rolling mills or the like
US3247697A (en) * 1962-12-06 1966-04-26 Blaw Knox Co Strip rolling mill

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1044007B (de) * 1957-09-21 1958-11-20 Demag Ag Quarto-Walzgeruest, dessen Arbeitswalzen durch in deren Einbaustuecke gefuehrte hydraulisch beaufschlagte Verstellmittel gegen ihre zugehoerigen Stuetzwalzen gepresst werden
US2985042A (en) * 1959-04-30 1961-05-23 United Eng Foundry Co Rolling mill
AT222607B (de) * 1960-02-19 1962-08-10 Schloemann Ag Quartogerüst mit gegen die Stützwalzen abgestützten Arbeitswalzen
FR1314562A (fr) * 1961-12-01 1963-01-11 Spidem Ste Nle Laminoir précontraint à serrage inverse

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA683660A (en) * 1964-04-07 A. Fox Thomas Rolling mill structures
CA701014A (en) * 1964-12-29 Verwaltungsgesellschaft Moeller U. Neumann Offene Handelsgesellschaft Elimination of excentricity in rolling mills
US1669550A (en) * 1926-04-01 1928-05-15 United Eng Foundry Co Rolling mill and method of rolling
US2345931A (en) * 1941-12-11 1944-04-04 Major E Gates Controlling apparatus
GB728012A (en) * 1952-01-18 1955-04-13 Sandvikens Jernverks Ab Rolling mill
US3024679A (en) * 1957-07-01 1962-03-13 Thomas A Fox Skin pass mills and methods of rolling
US3124982A (en) * 1959-11-05 1964-03-17 Rolling mill and control system
US3191408A (en) * 1962-02-08 1965-06-29 Blaw Knox Co Hydraulic pressure regulating system for rolling mills or the like
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

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3427839A (en) * 1960-03-14 1969-02-18 Moeller & Neumann Verwalt Ges Hydraulic adjusting means for rolling mills
US3537285A (en) * 1964-12-22 1970-11-03 Davy & United Eng Co Ltd Prestressed rolling mill and control
US3464245A (en) * 1965-05-03 1969-09-02 Davy & United Eng Co Ltd Rolling mill having a controlled hydraulic prestress range and other gap adjusting means for initial operation and for adjustment to said range
US3533255A (en) * 1965-08-24 1970-10-13 Raymond Bernard Sims Rolling mill
US3490256A (en) * 1966-02-10 1970-01-20 United Eng Foundry Co Control for obtaining constant gauge in a rolling mill
US3491571A (en) * 1966-02-14 1970-01-27 United Eng Foundry Co Rolling mill method and apparatus
US3496743A (en) * 1966-09-09 1970-02-24 United Eng Foundry Co Rolling mill for producing constant gauge
US3492848A (en) * 1966-09-19 1970-02-03 United Eng Foundry Co Automatic gauge control for rolling mills
US3416341A (en) * 1966-12-12 1968-12-17 Kaiser Aluminium Chem Corp Rolling mill control system
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
US3507139A (en) * 1967-05-17 1970-04-21 Davy & United Eng Co Ltd Rolling mills
US3709007A (en) * 1969-11-18 1973-01-09 Mitsubishi Heavy Ind Ltd Hydraulically loaded rolling mills
DE2515015A1 (de) * 1975-04-07 1976-10-21 Schloemann Siemag Ag Quarto-walzgeruest
US4087999A (en) * 1976-11-24 1978-05-09 Vydrin Vladimir Nikolaevich Device for automatic adjustment of roll gap in mill stand
US4380954A (en) * 1980-02-28 1983-04-26 Kleinewefers Gmbh Method and apparatus for controlling the pressure exerted on a material web in the roller nip of a rolling mill

Also Published As

Publication number Publication date
FR1338908A (fr) 1963-10-04
GB955164A (en) 1964-04-15
FR85591E (enrdf_load_html_response) 1965-12-10
DE1285970B (de) 1969-01-02
GB1012853A (en) 1965-12-08
DE1285970C2 (de) 1975-02-27

Similar Documents

Publication Publication Date Title
US3327508A (en) Rolling mills
US3247697A (en) Strip rolling mill
CN101733287A (zh) 轧机工作辊水平偏移量调节定位装置
US3427839A (en) Hydraulic adjusting means for rolling mills
DE3306549A1 (de) Walzvorrichtung
US3286495A (en) Deformation compensating hydraulic device for rolling mills of the hydraulic mechanical pressure type
US3496743A (en) Rolling mill for producing constant gauge
US3416341A (en) Rolling mill control system
US3197986A (en) Control system for rolling mills
US3285049A (en) Rolling mill with closed frames and with a control system for continuously and rapidly adjusting the roll gap
US2369598A (en) Adjusting device for rolling mills
CN201565467U (zh) 轧机工作辊水平偏移量调节定位装置
US3712095A (en) Slab rolling
US3490256A (en) Control for obtaining constant gauge in a rolling mill
US3855830A (en) Method and apparatus for controlling plate thickness in a rolling mill
GB1307823A (en) Rolling of strip or plate material
CN112973868A (zh) 四辊破碎机辊间隙自动调整系统
US2056409A (en) Rolling mill
DE1954211A1 (de) Einrichtung zum Herstellen von blattfoermigem Material und Streifen aus einem Teilchenmaterial wie Puder
DE2459248C2 (de) Regelungs-Vorrichtung zum Ausregeln walzkraftbedingter Walzendurchbiegungen
GB1346878A (en) Rollmill control system
US3464245A (en) Rolling mill having a controlled hydraulic prestress range and other gap adjusting means for initial operation and for adjustment to said range
US3315507A (en) Method and apparatus for controlling thickness of elongated workpieces
US3550413A (en) Gage control for rolling mills
US3587266A (en) Method and apparatus for rolling flat material in rolling mills or the like