US3750448A - Twin stand rolling mill-azial roll alignment - Google Patents

Twin stand rolling mill-azial roll alignment Download PDF

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Publication number
US3750448A
US3750448A US00125678A US3750448DA US3750448A US 3750448 A US3750448 A US 3750448A US 00125678 A US00125678 A US 00125678A US 3750448D A US3750448D A US 3750448DA US 3750448 A US3750448 A US 3750448A
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United States
Prior art keywords
arm
rolling mill
mill stand
pivot
stand according
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Expired - Lifetime
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US00125678A
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English (en)
Inventor
R Oxlade
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British Iron and Steel Research Association BISRA
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British Iron and Steel Research Association BISRA
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Publication of US3750448A publication Critical patent/US3750448A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/005—Cantilevered roll stands
    • 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
    • B21B2203/22—Hinged chocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/22—Aligning on rolling axis, e.g. of roll calibers
    • 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
    • B21B31/18—Adjusting or positioning rolls by moving rolls axially

Definitions

  • ABSTRACT A four-high rolling mill stand has each work roll mounted to the free end of a preloaded drive shaft r0- tatably carried in an individual arm pivotally mounted in the mill frame.
  • the effective position of the pivot axis of one arm is movable through a limited arc relative to the pivot axis of the other arm by means of limited rotation of eccentric pivot pins, whereby to effect adjustment of the axial position of the work rolls relative to one another to avoid ovality or assymetry in the rolled stock.
  • PATENTEL 7 I975 SHEEI 3 OF 3 @V/ZV/Z INVENTOR ATTORNEY TWIN STAND ROLLING MILL-AZIAL ROLL ALIGNMENT BACKGROUND OF THE INVENTION
  • This invention relates to rolling mills and particularly, but not exclusively, to rod or bar stock rolling mills.
  • US. Pat. No. 3,613,4208 discloses a rolling mill stand including a frame, two work rolls drivably carried in said frame, an arm rotatably carrying one of said work rolls, means pivotally mounting said arm in said frame, said means defining a pivot axis extending substantially parallel to and spaced apart from the stock pass line between said work rolls, said pivot axis being substantially fixed in position relative to said arm, whereby said arm carrying its associated work roll is pivotally movable about said fixed pivot axis to permit adjustment of the work gap between said rolls, and wherein said work rolls are backed up by support rolls rotatably mounted in said frame so that the axes of rotation of the support rolls are movable with respect to the frame for alignment of the support rolls on their associated work rolls.
  • each said work roll is carried in an individual arm pivotally mounted in said frame, both arms being pivoted about a substantially common pivot axis.
  • US. Pat. No. 3,587,267 discloses, in one aspect thereof, a rolling mill stand wherein at least one of the work rolls is carried on a shaft mounted to be movable to a limited extent at least about a specified axis, and preferably about a point, so that the work roll can move slightly in the stock pass line.
  • a load cell is provided between the work roll shaft and the mill frame to provide a signal indicative of the stock tension.
  • the shaft is preferably mounted in a bearing block which is slidable in a guide to a limited extent axially of the shaft. Hydraulic capsules are defined between the block and the guide and means are provided for controllably supplying fluid under pressure to said capsules, whereby the axial position of the shaft is controllably adjustable. The main reason for this adjustment is to permit accurate alignment of the roll grooves in the work rolls to avoid ovality or assymmetry in the rolled stock.
  • the pressure in the capsules also determines the preloading of the shaft bearing assembly as a whole.
  • An object of the present invention is to provide an improved arrangement for permitting alignment of the roll grooves with respect to one another.
  • a rolling mill stand comprising a frame, two work rolls drivably carried in said frame, an arm rotatably carrying one of said work rolls, said arm being pivotally mounted in said frame, said work rolls being backed up by support rolls rotatably carried in said frame and wherein means is provided for adjusting the effective position of the pivot axis of said pivotal mounting whereby to permit adjustment of the axial position of the work rolls with respect to one another.
  • FIG. 1 is a side view of a fOUFhIgl'I rolling mill stand according to the invention with a vertical part of the mill frame removed for clarity;
  • FIG. 2 is a sectional view taken substantially along line A--A of FIG. 1, and
  • FIG. 3 is a sectional view taken substantially along line 8-8 of FIG. 2.
  • a four-high rolling mill stand comprising a frame having vertical side members 10, 11 and upper and lower cross members l2, 13.
  • Two arms l4, 15 are pivotally mounted in the frame.
  • the upper arm 14 has a pivot axis 16 and the lower arm a pivot axis 17.
  • the arms rotatably mount work roll drive shafts 18, 19 respectively having work rolls 20, 21 mounted to the free ends thereof.
  • the shafts are driven by motors (not shown) through couplings 22, 23, preferably both of which allow limited axial movement of their respective shafts.
  • Support rolls 24, 25 back up the work rolls and are mounted in the frame so that their axes of rotation are movable for alignment of the support rolls on their respective work rolls.
  • the support rolls are carried by the respective arms l4, 15.
  • the lower arm 15 is pivotally mounted to the frame by means of pivot pins 30 which are symmetrical about pivot axis 17 and which work in bores 31 formed in the heads 32 of eccentric pivot pins 33.
  • Heads 32 are normally fixedly secured with respect to the lower arm 15.
  • the heads 32 have an outer cylindrical surface 34 coaxial with the axis 17 of pin 30.
  • the heads 32 are received in split housings forming part of the lower arm 15.
  • An upper semi-circular part 40 of each housing is secured to arm 15 by two bolts 41. The dimensions are such that when bolts 41 are tightened the housing grips or locks the associated pivot pin head 32 to prevent rotation thereof. When the bolts 41 are slackened the heads 32 may be rotated relative to the arm 15.
  • Pivot pin 33 has a circular cross section tail portion 45 eccentric with respect to its head 32. This is best shown in FIG. 3.
  • the upper arm 14 is mounted for rotation on the tail portion about the tail portion axis 16 by means of a suitable bearing assembly, such as a preloaded taper roller bearing assembly 46.
  • the pin 33 may be so rotated by any suitable means, but the arrangement particularly shown comprises toothed segments 50 secured to the respective pins 33.
  • the segments are driven by gears 51 mounted on a shaft 52 which in turn is driven by a suitable motor (not shown).
  • the extent of movement of segments 50 is preferably indicated by a scale visible to the mill operator.
  • bell crank levers may be employed, and instead of a drive motor, hydraulic cylinder power or manual operation may be used.
  • bolts 41 should be slackened before the above adjustment is effected, and retightened after adjustment. It will be appreciated that the adjustment described comprises movement of the whole upper arm 14 relative to the lower arm, in either direction generally axially of the work roll shafts. Consequently precise alignment of the roll grooves in the work rolls can be effected.
  • the bearing assembly 60 comprises a central selfaligning spherical roller bearing 62 with a pair of oppositely directed spherical roller thrust bearings 63, 64 spaced on opposite sides thereof by spacer rings 65, 66.
  • the whole bearing assembly is axially preloaded by hydraulic fluid introduced under pressure to capsule 70 to urge'sliding block 71 axially against bearing 63.
  • the more remote face of opposite bearing 64 is consequently urged against a positive end stop constituted by a part 72 of the bearing housing.
  • This arrangement pro vides a somewhat stiffer system in the axial direction than an earlier arrangement wherein balanced hydraulic pressure cap chambers were utilized both to preload the shaft and to adjust its position axially.
  • a rolling mill stand comprising a frame, two work rolls drivably carried in said frame, an arm rotatably carrying one of said work rolls, pivot means pivotally mounting said arm in said frame, said pivot means defining for said arm a movable pivot axis extending parallel to and spaced apart from the stock pass line between said work rolls, said work rolls being backed up by support rolls rotatably carried in said frame, means being providedfor adjusting the effective position of the movable pivot axis defined by said pivot means in a direction transverse to said pivot axis position to permit adjustment of the axial position of the work rolls with respect to one another.
  • each said work roll is carried in an individual arm pivotally mounted in said frame.
  • a rolling mill stand according to claim 2 wherein the effective position of said movable pivot axis of said first mentioned arm is adjustable in an are centered on the pivot axis of the other arm.
  • a rolling mill stand according to claim 1 wherein said means for adjusting the effective pivot axis position comprises means for rotation through an arc, and in unison, a pair of eccentric pivot pins, said pivot pins being associated with and serving pivotally to mount said first mentioned arm.
  • a rolling mill stand according to claim 4 including releasable means for releasably clamping each pivot pin to prevent rotation thereof when adjustment movement is not required.
  • a rolling mill stand according to claim 1 wherein said work rolls and their associated support rolls have substantilly cylindrical outer surfaces for mutual engagement.
  • a rolling mill stand according to claim 1 wherein said movable pivotal axis intersects the axis of rotation of the work roll carried by said pivotally mounted arm.
  • a rolling mill stand according to claim 1 wherein said first mentioned arm carries its associated work roll mounted to a free end of a work roll drive shaft, said shaft being rotatably mounted in said arm in bearings arranged to preload the shaft both radially and axially.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Support Of The Bearing (AREA)
  • Metal Rolling (AREA)
US00125678A 1970-03-18 1971-03-18 Twin stand rolling mill-azial roll alignment Expired - Lifetime US3750448A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1299770 1970-03-18

Publications (1)

Publication Number Publication Date
US3750448A true US3750448A (en) 1973-08-07

Family

ID=10014945

Family Applications (1)

Application Number Title Priority Date Filing Date
US00125678A Expired - Lifetime US3750448A (en) 1970-03-18 1971-03-18 Twin stand rolling mill-azial roll alignment

Country Status (8)

Country Link
US (1) US3750448A (en:Method)
BE (1) BE764414A (en:Method)
CA (1) CA951549A (en:Method)
DE (1) DE2112998A1 (en:Method)
FR (1) FR2083396B1 (en:Method)
GB (1) GB1333065A (en:Method)
SE (1) SE382398B (en:Method)
ZA (1) ZA711436B (en:Method)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002280A1 (en) * 1985-10-15 1987-04-23 CENTRO-MORGA^oRDSHAMMAR AB Wire rod block
US5327760A (en) * 1992-01-17 1994-07-12 Sms Schloemann-Siemag Aktiengesellschaft Roller leveller
US5524470A (en) * 1994-03-24 1996-06-11 Italimplanti Of America, Inc. Plug mill bottom roll adjustment

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1085568A (en) * 1911-03-29 1914-01-27 Pettingell Machine Co Beading, molding, and cutting machine.
US1822697A (en) * 1929-10-04 1931-09-08 Niagara Machine & Tool Works Sheet-metal working machine
US3190098A (en) * 1959-02-16 1965-06-22 British Iron Steel Research Cantilever rolling mill
US3468151A (en) * 1965-02-26 1969-09-23 Spidem Ste Nle Rolling mill
US3613428A (en) * 1967-11-15 1971-10-19 British Iron Steel Research Rolling mills

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1085568A (en) * 1911-03-29 1914-01-27 Pettingell Machine Co Beading, molding, and cutting machine.
US1822697A (en) * 1929-10-04 1931-09-08 Niagara Machine & Tool Works Sheet-metal working machine
US3190098A (en) * 1959-02-16 1965-06-22 British Iron Steel Research Cantilever rolling mill
US3468151A (en) * 1965-02-26 1969-09-23 Spidem Ste Nle Rolling mill
US3613428A (en) * 1967-11-15 1971-10-19 British Iron Steel Research Rolling mills

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002280A1 (en) * 1985-10-15 1987-04-23 CENTRO-MORGA^oRDSHAMMAR AB Wire rod block
US4785653A (en) * 1985-10-15 1988-11-22 Centro-Morgardshammar Ab Wire rod block
US5327760A (en) * 1992-01-17 1994-07-12 Sms Schloemann-Siemag Aktiengesellschaft Roller leveller
US5524470A (en) * 1994-03-24 1996-06-11 Italimplanti Of America, Inc. Plug mill bottom roll adjustment

Also Published As

Publication number Publication date
GB1333065A (en) 1973-10-10
DE2112998A1 (de) 1971-10-07
FR2083396A1 (en:Method) 1971-12-17
BE764414A (fr) 1971-08-16
CA951549A (en) 1974-07-23
SE382398B (sv) 1976-02-02
FR2083396B1 (en:Method) 1975-01-17
ZA711436B (en) 1971-11-24

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