US3861190A - Rolling mills - Google Patents

Rolling mills Download PDF

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Publication number
US3861190A
US3861190A US322191A US32219173A US3861190A US 3861190 A US3861190 A US 3861190A US 322191 A US322191 A US 322191A US 32219173 A US32219173 A US 32219173A US 3861190 A US3861190 A US 3861190A
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United States
Prior art keywords
support
rolls
roll
work
axis
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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US322191A
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English (en)
Inventor
Jack Maltby
Dennis Stubbs
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British Steel Corp
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British Steel Corp
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Publication date
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    • 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
    • B21B31/22—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis mechanically, e.g. by thrust blocks, inserts for removal
    • 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

Definitions

  • ROLLING MILLS [75] Inventors: Jack Maltby; Dennis Stubbs, both of Sheffield, England [73] Assignee: British Steel Corporation, London,
  • ABSTRACT A four-high rolling mill stand for rolling metal bar stock.
  • Each work roll is carried by a work roll arm pivotably mounted about a first axis and each support or back-up roll is carried by a separate support roll arm, each support roll arm being pivotally mounted about a second and third axis respectively positioned on opposite sides of the first axis.
  • the position of one or each of the second and third axes is adjustable to permit adjustment of the axes of the associated support or back-up rolls towards and away from the stock pass line.
  • SHEET 5 0F 5 ROLLING MILLS This invention relates to rolling mills and particularly to four or more high cantilever rod or bar or strip stock rolling mills.
  • British Pat. Specification No. 1,240,658 discloses and claims such a mill and particularly describes a mill wherein each work roll together with its associated support roll is carried for rotation in an individual arm pivotally mounted in the mill frame, the two arms being mounted for pivotal movement about a single fixed pivot axis.
  • This arrangement leads to substantial design complexity in the neighbourhood of that pivot axis, to consequent possible mechanical weaknesses under heavy load, and to difficulty of access for repair and maintenance of the parts of the mill near the pivot axis.
  • an eccentric pivot pin arrangement is utilised as disclosed and claimed in pending Pat. Application No. 125,678, filed Mar. 18, 1971, now U.S. Pat. No. 3,750,448.
  • An object of the present invention is to provide an improved mill design taking into account the above and other factors.
  • a rolling mill stand including two work rolls drivably carried in a mill frame, each work roll being backed up by a support roll, at least one of said work rolls being rotatably carried by an arm pivotable about a first axis for adjustment of the work gap between said work rolls, the support roll associated with said one work roll being rotatably carried on another arm mounted in the frame for pivotal movement about a second axis spaced apart from said first mentioned axis, for adjustment of the gap between said support rolls, the pivot axes being substantially perpendicular to the axes of the rolls.
  • each work roll is carried by a separate work roll arm pivotable about said first axis
  • each support roll is carried by a separate support roll arm pivotable respectively about said second axis and a third axis, said second and third axes being spaced apart on opposite sides of said first axis.
  • the work roll arms are preferably carried in individual arms pivoted together to form a sub-assembly, the sub-assembly being releasably and removably mounted to the frame.
  • the sub-assembly may extend between, and substantially perpendicular to, the two spaced apart support roll arm pivot axes.
  • the means for adjusting the effective position of said axis or axes includes graduation marks so that the effective position of said axis (axes) can be preselected.
  • FIG. 1 is a general elevation of a close coupled twin stand four high bar or rod rolling mill according to the invention
  • FIG. 2 is a part sectional side elevation of one stand of the mill shown in FIG. 1;
  • FIG. 3 is a part sectional rear elevation of the stand of FIG. 2 shown in two positions to either side of the vertical centre line;
  • FIG. 4 is a sectional view on the line IV-lV of FIG. 2;
  • FIG. 5 is a part sectional front elevation of the stand of FIG. 2 shown in two positions to either side of the vertical centre line.
  • FIG. 1 a close coupled twin stand fourhigh cantilever rod or bar mill viewed along the stock pass line 9.
  • the two stands 10, 11 have a common basic frame 12 including standards l3, l4 and upper and lower cross beams l5, 16 for each stand.
  • the stands are driven, for example, by individual motors 17, 18 and are arranged in a no twist mode so that the rolled stock need not be twisted between the two passes.
  • the stands are similar and one is shown in FIGS. 2, 3 and 5 turned through 45 for ease of illustration.
  • Each stand comprises a pair of work rolls 20, 21 backed up by respective support rolls 22, 23.
  • the work rolls are releasably mounted to the free ends of work roll drive shafts 24, 25 which are rotatably carried in respective work roll arms 26, 27 and are driven through couplings 28, 29 by the motors 17, 18.
  • the two arms 26, 27 are pivotally mounted one to the other about a first axis at pivot 30 to form a sub-assembly which is releasably held in the frame by an off-set pin 31. Attention is directed to our above referance co-pending Application of even date for a further disclosure of this sub-assembly.
  • the support rolls 22, 23, are rotatably mounted to and carried by upper and lower support roll arms 35, 36.
  • Each arm comprises a central web 37 with upper and lower flanges 38, 39 and secured to a massive forward chock 40.
  • Each arm 35, 36 is mounted at its rearward end for pivotal movement about a respective second and third axis at pivot pins 41 by means of an eccentric pivot pin arrangement described later in relation to FIG. 4.
  • Each chock 40 has a stub axle 42 secured thereto and the support roll is mounted thereby by means of a selfaligning spherical roller bearing indicated schematically at 43 so that the support rolls are aligned on their associated work rolls.
  • This bearing is stabilised against the unwanted rotation about a horizontal axis by means of a flat sided guide 43a projecting forwardly from the axle 42 and slidable to a limited extend vertically in vertical slot 43b in a circular plate 44.
  • a collar 45 secured to the support roll rotates concentrically about stationary plate 44 by means of a simple ball race bearing 46.
  • each support roll pivot pin 41 may be withdrawn from the frame by means of handle 47, normally latched, to permit ready installation and removal of each entire support roll and support roll arm sub-assembly forwardly through the opening between the frame standards.
  • the pivot pin 41 works in bores 48 in massive cross frame members 49 secured to the basic frame 12.
  • Pivot pin 41 mounts an eccentric 50 having an external cylindrical surface 51 centred on axis 52 which is off set from the axis 53 of the pivot pin 41.
  • Surface 51 works within a bore in the rearward end of the support roll arm. It will thus be appreciated that movement of eccentric 50 in an are relative to pin 41 will cause movement in an arc of the position of the effective pivot axis 52 of the appropriate support roll arm.
  • the eccentric is arranged so that in its centre position of its travel the two axes 52, 53 are side by side as seen in FIG. 2 so that movement of the eccentric from its centre position causes the effective pivot axis 52 to move substantially vertically up or down, at least at the start of its travel, as viewed in FIG. 2.
  • Adjustment of the position of the eccentric is effected by slackening lock nuts 55, 56 and moving rod 57 substantially axially through an aperture in boss 58 which is secured to the web 37.
  • Rod 57 is pivotally attached at 59 to the arms 60 of the eccentric 50.
  • Graduations 61 marked on the eccentric opposite a mark on the web 37 assist in adjusting the eccentric to a desired position.
  • the lock nuts are then tightened.
  • the forward ends of the support roll chocks 40 are a close sliding fit between the standards 13, 14 of the mill frame.
  • the upper chock has depending side members 70 and the lower chock has upper side members 71.
  • Member 71 houses piston and cylinder devices 72 which can be pressurised to separate the two chocks 40 from their closest position seen on the left hand side of FIG. 5 to their most widely spaced normal operating positions seen on the right hand side of FIG. 5. These devices 72 are also pressurised when the mill is in use to preload the mill as will be described below.
  • the forward end of the work roll arms present bearing blocks 80 which are a sliding fit between the side members 70, 71 of the associated support roll chocks 40.
  • the lower block 80 houses piston and cylinder devices 81 which can be pressurised to separate the two chocks 80 from their closest position seen on the left hand side of FIG. 5 to their most widely spaced position seen on the right hand side of FIG. 5. These devices are also pressurised when the mill is in use to pre-load the mill.
  • a piston and cylinder device 96 mounted in the lower chock 40 serves when extended to separate the lower work roll 21 from the support roll 23.
  • the lower support roll arm 36 is supported on the basic frame 12 by virtue of its chock 40 resting on an adjustable wedge device 82, the position of the wedge 83 thereof being controlled by handles 84.
  • the rolling force between the work rolls is provided by a massive hydraulic piston and cylinder device 85 having a line of action coincident with that of the wedge device and with the centre line between the frame standards.
  • Device acts on the chock 40 of the upper support roll of arm 35 and is adapted to accommodate for the slight angular mis-alignments which occur in operation due to the fact that the rolls are all carried by arms movable about pivot axes within a finite distance from the stock pass line.
  • a preferred form of the device 85 is disclosed in our co-pending British Pat. Application No. 20649/72 entitled Hydraulic Actuators.
  • the operation of the rolling mill will now be described. Assume that the mill stand has just been re assembled for use with fresh support rolls and fresh work rolls and also that the maximum work roll gap (e.g. 4mm) is to be used.
  • the wedge device 82 is adjusted to raise, or lower, the top line of the lower work roll 21 into correct relationship with the stock pass line (e.g. 2mm below it in this case). It will be appreciated that work roll 21 rests on support roll 23 and is carried up or down therewith.
  • the eccentric 50 associated with the lower support roll arm 36 is adjusted, if necessary, so that the lower support roll axis is adjusted towards or away from the associated work roll axis to maintain the axis of the support roll as closely parallel to the work roll axis.
  • the separating devices 81 are actuated to raise or lower the upper work roll arm relative to the lower arm so that the work roll gap is the correct vertical height. Eccentric pivot pin arrangement can then be operated if necessary to adjust the axial roll groove alignment as described in our above referenced co-pending Application.
  • the devices 72 are relaxed so that the upper support roll arm 35 descends to bring the upper support roll 22 to rest on its associated work roll 20.
  • the loading device 85 is pressurised and at the same time the devices 72 and 81 are pressurised so that all the slack between the four arms themselves and between the arms and the frame, and the resilience of the frame itself is taken up. All surfaces in the load path are thus pre-stressed.
  • control of the pressure applied to device 85 controls the work roll gap. This condition of the four rolls is shown on the right hand side of FIG. 5.
  • the device 85 is acting at an extreme angle of about 23 minutes in this condition.
  • the work rolls wear and at intervals need redressing. Similarily the support rolls wear.
  • the loading device 85 is relaxed, and separating devices 72, 81 and 96 operated to maintain an open gap between the work rolls and open a gap between the work rolls and the support rolls. The work rolls may then be released from the ends of their drive shafts and fresh or re-dressed rolls mounted thereof.
  • a similar procedure is followed for removal and replacement of the support rolls.
  • the devices 72 and 81 will be in their most retracted positions shown on the left hand side of FIG. 5, and the eccentrics 50 will also have been adjusted to near the other ends of their travel.
  • the device 85 will be acting at an extreme angle of up to about 37 minutes.
  • the eccentrics 50 may need to be adjusted at a support roll change operation but would not normally need adjustment for work roll changes.
  • the device 85 is then de-pressurised, wedge device 82 adjusted to its lowest possible position and devices 72 operated to their fullest extent.
  • the piston and cylinder device 96 is pressurised to lift the lower work roll just clear of the lower support roll to avoid rubbing.
  • the drive shafts are decoupled and the sub-assembly and then be removed forwardly between the frame standards by means of a porter bar.
  • the loading device 85 has to act at one extreme angle for maximum diameter rolls and maximum roll gap, and the other extreme angle for minimum diameter rolls and minimum roll gap.
  • the angular difference between these extremes is reasonably small in magnitude and the device can be designed to accommodate for this in a number of ways, even in view of the extreme magnitude of the operational loads present in a rolling mill.
  • the angular difference between these two extreme positions can be reduced by removing the second and third pivot axes 52 further apart to bring them nearer level with devices 85 and the wedge device 82 respectively.
  • the problem of scrubbing of the support roll from the work rolls becomes more severe. The latter problem is more serious and so the best compromise position for the pivot axes is chosen for each particular practical design of mill.
  • each support roll arm carrying its support roll and eccentric arrangement can be removed as a whole.
  • graduations 61 near the eccentrics a support roll can be replaced as is reasonably practical, the relative positions illustrated being sufficient to reduce to a practical minimum the discussed angular changes in position of the four arms during various conditions of use of the mill.
  • a rolling mill stand including:
  • each arm carrying a respective work roll
  • a first pivotal mounting means to which both work roll arms are mounted to permit pivotal movement of the work roll arms in a plane substantially parallel to a plane containing the axis of the work rolls, for adjustment of the gap between the work rolls,
  • each arm carrying a respective support roll
  • a rolling mill stand including a third pivotal mounting means spaced from both the first and the second pivotal mounting means and to which the other support roll arm is mounted, thereby permitting pivotal movement of both support roll arms independently of one another in a plane substantially parallel to the plane of movement of the work roll arms.
  • a rolling mill stand according to claim 1 in which means are provided for adjustment of the second pivotal mounting means whereby to permit adjustment of the axis of the associated support roll towards and away from the stock pass line.
  • a rolling mill stand according to claim 2 in which means are provided for adjusting the second and third pivotal mounting means whereby to permit adjustment of the axis of the associated support rolls towards and away from the stock pass line.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US322191A 1972-01-27 1973-01-09 Rolling mills Expired - Lifetime US3861190A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB388772A GB1385494A (en) 1972-01-27 1972-01-27 Rolling mills

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US3861190A true US3861190A (en) 1975-01-21

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US322191A Expired - Lifetime US3861190A (en) 1972-01-27 1973-01-09 Rolling mills

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US (1) US3861190A (enrdf_load_stackoverflow)
JP (1) JPS4884072A (enrdf_load_stackoverflow)
AU (1) AU465545B2 (enrdf_load_stackoverflow)
CA (1) CA962864A (enrdf_load_stackoverflow)
DE (1) DE2303467A1 (enrdf_load_stackoverflow)
FR (1) FR2169298B1 (enrdf_load_stackoverflow)
GB (1) GB1385494A (enrdf_load_stackoverflow)
IT (1) IT977672B (enrdf_load_stackoverflow)
SE (1) SE376554B (enrdf_load_stackoverflow)
ZA (1) ZA73139B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964282A (en) * 1972-05-19 1976-06-22 British Steel Corporation Rolling mills
WO1987002280A1 (en) * 1985-10-15 1987-04-23 CENTRO-MORGA^oRDSHAMMAR AB Wire rod block
US5524470A (en) * 1994-03-24 1996-06-11 Italimplanti Of America, Inc. Plug mill bottom roll adjustment
CN114786832A (zh) * 2019-12-11 2022-07-22 Sms集团有限公司 用于热轧机和用于制造金属扁平产品的热轧机架、热轧机以及用于运行热轧机的方法
US12269080B2 (en) 2019-12-11 2025-04-08 Sms Group Gmbh Modular rolling train, particularly hot rolling train, preferably in conjunction with an upstream casting facility

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4244204A (en) * 1977-11-16 1981-01-13 Vydrin Vladimir N Mill stand
CN102962261B (zh) * 2012-11-23 2014-07-23 武钢集团昆明钢铁股份有限公司 一种精轧机组锥箱安装调整方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1900032A (en) * 1930-10-25 1933-03-07 Worthington Warren Bar mill
US3613428A (en) * 1967-11-15 1971-10-19 British Iron Steel Research Rolling mills

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1900032A (en) * 1930-10-25 1933-03-07 Worthington Warren Bar mill
US3613428A (en) * 1967-11-15 1971-10-19 British Iron Steel Research Rolling mills

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3964282A (en) * 1972-05-19 1976-06-22 British Steel Corporation Rolling mills
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
US5524470A (en) * 1994-03-24 1996-06-11 Italimplanti Of America, Inc. Plug mill bottom roll adjustment
CN114786832A (zh) * 2019-12-11 2022-07-22 Sms集团有限公司 用于热轧机和用于制造金属扁平产品的热轧机架、热轧机以及用于运行热轧机的方法
US12269080B2 (en) 2019-12-11 2025-04-08 Sms Group Gmbh Modular rolling train, particularly hot rolling train, preferably in conjunction with an upstream casting facility
US12343776B2 (en) 2019-12-11 2025-07-01 Sms Group Gmbh Hot-rolling stand for a hot-rolling mill and for producing a flat metal product, hot-rolling mill and method for operating a hot-rolling mill

Also Published As

Publication number Publication date
SE376554B (enrdf_load_stackoverflow) 1975-06-02
FR2169298A1 (enrdf_load_stackoverflow) 1973-09-07
ZA73139B (en) 1973-09-26
AU5104073A (en) 1974-07-18
DE2303467A1 (de) 1973-08-02
IT977672B (it) 1974-09-20
GB1385494A (en) 1975-02-26
FR2169298B1 (enrdf_load_stackoverflow) 1978-10-27
JPS4884072A (enrdf_load_stackoverflow) 1973-11-08
AU465545B2 (en) 1975-10-02
CA962864A (en) 1975-02-18

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