US3461527A - Rolls for rolling mills - Google Patents

Rolls for rolling mills Download PDF

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Publication number
US3461527A
US3461527A US614227A US3461527DA US3461527A US 3461527 A US3461527 A US 3461527A US 614227 A US614227 A US 614227A US 3461527D A US3461527D A US 3461527DA US 3461527 A US3461527 A US 3461527A
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United States
Prior art keywords
roll
ring
rolls
core
hard metal
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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US614227A
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English (en)
Inventor
Per Olof Strandell
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.)
Santrade Ltd
Original Assignee
Individual
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.)
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Publication date
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Publication of US3461527A publication Critical patent/US3461527A/en
Assigned to SANTRADE LTD., A CORP. OF SWITZERLAND reassignment SANTRADE LTD., A CORP. OF SWITZERLAND ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SANDVIK AKTIEBOLAG, A CORP. OF SWEDEN
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/03—Sleeved rolls
    • B21B27/035—Rolls for bars, rods, rounds, tubes, wire or the like
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • Y10T29/49547—Assembling preformed components
    • Y10T29/49549—Work contacting surface element assembled to core
    • Y10T29/49552—Work contacting surface element assembled to core with prestressing of component by heat differential, e.g., shrink, fit

Definitions

  • the roll ring according to the arrangement is mounted with a clearance fit on the roll core and is secured to the same by pressure means which act axially against the flat end surfaces only of the roll ring, the pressure means imparting to the roll ring the force necessary for fixing and pre-stressing the said ring so that it is capable of withstanding the rolling forces.
  • the present invention relates to an arrangement in rolls for rolling mills of the type which present a roll core on which can be fixed a ring or sleeve of hard material having a high degree of hardness and resistance to wear.
  • the surface of the rolls are subjected to considerable wear, particularly in the case of hot rolling, which in addition to impaired microgeometry also contributes to deviations in measurements. This is particularly noticeable in the case of so-called calipered rolls which are intended to give a certain configuration, determined by the groove in said roll. Worn rolls must of necessity be periodically removed from the mills for re-grinding, resulting in reduced effective production time.
  • the object of the invention is to eliminate these deleterious stresses, by means of a special roll structure.
  • the invention is mainly characterized in that said ring or sleeve is capable of being mounted and is mounted, respectively, With a clearance fit on a roll core, and capable of being fixed and is fixed, respectively, to the said core by means of pressure means capable of being urged axially and which are urged axially, respectively, solely against the end surface of the sleeve, the said pressure means providing the force necessary for fixing the sleeve and enabling it to take up the forces created under rolling conditions.
  • FIGURE 1 shows in perspective, partly in section, a working roll designed in accordance with the invention.
  • the roll shown in the drawing is intended to be used in rolling mills of the type which utilize backing rolls, i.e. a rolling mill where the material is worked between two working rolls supported by backing rolls, which take up the rolling forces.
  • FIGURE 2 shows a section of a similar caliper roll, designed according to the invention.
  • a roll body or core suitably made of tempered steel of high strength.
  • a ring or sleeve 2 which has circular cross section, is mounted and capable of being mounted, respectively, with a clearance fit on the roll core, the ring or sleeve 2 being made of a material having a high degree of hardness and wear resistance, e.g. a suitable hard metal.
  • Abutting each end of said sleeve 2 is a sleeve-shaped pressuremeans 3 and 4, suitably made of metal of high pressure and tensile strength, e.g. tempered steel.
  • the outer diameter of the pressure means are preferably at least slightly larger than the diameter of the hard metal sleeve 2, the difference in diameters being shown, although in an exaggeration, at 5 on the drawing.
  • the end portions of the roll core 1 are provided with trunnions 6 and also with threaded portions 7, on which are tightened nut members 8 by means of which the pressure means 3 and 4 can be tightened against the ends of the hard metal sleeve 2 so that said sleeve is fixed in position axially as well as radially relative to the core 1.
  • the rolls according to the invention are primarily intended to be used for hot rolling in which the rolls become hot and consequently expand to a certain extent. Since the coefiicient of thermal expansion of the hard metal is only half of that of the steel there is a grave risk that the hard metal ring will fracture unless a certain clearance exists between the said roll core and the roll ring.
  • the clamping force between the pressure members 3 and 4 is so high that the friction between the outer faces of the hard metal ring and the steel surfaces of the pressure means is suflicient to take up roll forces as well as torque. This is opposed to conventional structures, in which the roll forces urge the hard metal ring against the jacket surface of the core, the said jacket surface taking up the forces created during rolling.
  • FIGURE 2 Grooved rolls are used when rolling sections, and an example of such a roll, designed according to the inventon, provided with a groove, which in cooperation with a similar groove in a similar roll gives the workpiece a square cross section, is shown in FIGURE 2.
  • the roll members according to FIGURE 2 are the same as those shown in FIGURE 1, with the exception of the Slightly modified hard metal sleeve 2'; presenting a profile groove 9.
  • This groove in itself causes a substantial weakening of the hard metal sleeve and if the roll were of a conventional design the brittle hard-metal ring would easily fracture under the lateral forces which occur in the groove during rolling.
  • the metal ring is retained under axial pressure forces which are so powerful that the lateral forces can be completely overcome.
  • the roll ring was comprised of hard metal and had an outer diameter of 80 mm., and an inner diameter of 50 mm. and a length of 30 mm.
  • the largest outer diameter of the roll core was 45 mm. and the pressure means, on opposite sides of the roll ring, had an outer diameter of 81 mm.
  • the complete roll with the exception of the roll ring, was made of tempered steel.
  • the roll ring was provided with a V-shaped groove, the sides of which were at right angles to each other and had a length of 11 mm. in cross section.
  • the roll was intended to reduce the area of an oval workpiece by 40%, forming a square section having sides of 11 mm. in cross section.
  • the workpiece could have comprised a plain carbon steel having a carbon content of 0.15% or a high-alloyed highspeed steel.
  • the anticipated forces on the hard metal ring reached to approximately 2 tons for the carbon steel and 6 tons for the high speed steel.
  • An axial force, corresponding to the force necessary for stretching the roll core 3 pro mille acting against the flat side surfaces of the roll ring was required to pre-stress and fix the hard metal ring, so that it could withstand a roll force of approximately 60 tons. This axial force was obtained by preheating the steel portions of the roll to a temperature of 270 C. prior to mounting the roll ring.
  • the nuts could be easily backed off and the pressure means and hard-metal ring then removed from the roll core, subsequent to heating the complete roll to approximately 540 C., the hard metal ring and the remaining portions of the roll comprising tempered steel being well capable of withstanding this temperature.
  • the invention also offers the advantage that the inner surface of the roll ring of hard material need not be worked. Machining of the interiorof a hard metal ring is very expensive and can absorb upwards to half the total cost of the ring.
  • the said ring can be provided with an internal lining of easily machined material for instance, an aluminium or copper ring lining, fitted by shrinking, the lining being easily machined at low costs so that 'a centrally positioned hole having but a small clearance to the roll core being obtained.
  • a composite roll for rolling mills comprising a cylindrical roll core having threaded portions on at least one end thereof, a sleeve of hard material having an internal diameter slightly greater than the outer diameter of said core and end surfaces perpendicular to the roll axis, axially adjustable pressure means mounted on said threaded portions to apply force only against the end surfaces of said sleeve to thereby fix said sleeve against the forces created during rolling, said roll core and pressure means being made of high pressure, high tensile strength metal, said roll core having a coefficient of linear expansion higher than that of said sleeve, said pressure means having a cylindrical outer surface the diameter of which is slightly greater than that of said sleeve.

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  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US614227A 1966-02-09 1967-02-06 Rolls for rolling mills Expired - Lifetime US3461527A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1659/66A SE322749B (de) 1966-02-09 1966-02-09

Publications (1)

Publication Number Publication Date
US3461527A true US3461527A (en) 1969-08-19

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ID=20258598

Family Applications (1)

Application Number Title Priority Date Filing Date
US614227A Expired - Lifetime US3461527A (en) 1966-02-09 1967-02-06 Rolls for rolling mills

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US (1) US3461527A (de)
SE (1) SE322749B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3577619A (en) * 1969-05-12 1971-05-04 Sandvikens Jernverks Ab Method of manufacturing composite hardmetal rolls
FR2130417A1 (de) * 1971-03-17 1972-11-03 Hufnagl Walter
US3803683A (en) * 1968-12-10 1974-04-16 British Iron Steel Research Rolling mill work roll assemblies
US3902233A (en) * 1973-04-23 1975-09-02 Sumitomo Electric Industries Roll assembly
US4115910A (en) * 1976-04-29 1978-09-26 Gunther Hertel Roller reinforced with a hard metal jacket
US4274185A (en) * 1977-07-05 1981-06-23 Sumitomo Electric Industries, Ltd. Roll assembly for use in rolling a wire rod
US4876875A (en) * 1987-12-04 1989-10-31 Coors Porcelain Company Supported ceramic guide roller
US5109585A (en) * 1990-10-24 1992-05-05 Uwe Kark Roll for a roll stand having an exchangeable roll ring and a divided roll body
US20120028772A1 (en) * 2009-03-12 2012-02-02 Sandvik Intellectual Property Ab Roller comprising a drive shaft and a roller ring, as well as a method for assembling such a roller

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US256628A (en) * 1882-04-18 Richard birkholz
US983828A (en) * 1909-12-20 1911-02-07 Sellers Mfg Company Composite roll for rolling metal.
US1518836A (en) * 1924-03-08 1924-12-09 Firm Rheinische Stahlwerke Rolling mill
US2021913A (en) * 1933-12-15 1935-11-26 Fallon John Roller for conveyer furnaces
US2788957A (en) * 1953-03-30 1957-04-16 Drever Co Refractory roller furnace conveyor system
US3234769A (en) * 1962-07-17 1966-02-15 Kocks Gmbh Friedrich Rolling-mill stand with exchangeable rolls

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US256628A (en) * 1882-04-18 Richard birkholz
US983828A (en) * 1909-12-20 1911-02-07 Sellers Mfg Company Composite roll for rolling metal.
US1518836A (en) * 1924-03-08 1924-12-09 Firm Rheinische Stahlwerke Rolling mill
US2021913A (en) * 1933-12-15 1935-11-26 Fallon John Roller for conveyer furnaces
US2788957A (en) * 1953-03-30 1957-04-16 Drever Co Refractory roller furnace conveyor system
US3234769A (en) * 1962-07-17 1966-02-15 Kocks Gmbh Friedrich Rolling-mill stand with exchangeable rolls

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803683A (en) * 1968-12-10 1974-04-16 British Iron Steel Research Rolling mill work roll assemblies
US3851365A (en) * 1968-12-10 1974-12-03 British Iron Steel Research Rolling mill work roll assemblies
US3577619A (en) * 1969-05-12 1971-05-04 Sandvikens Jernverks Ab Method of manufacturing composite hardmetal rolls
FR2130417A1 (de) * 1971-03-17 1972-11-03 Hufnagl Walter
US3902233A (en) * 1973-04-23 1975-09-02 Sumitomo Electric Industries Roll assembly
US4115910A (en) * 1976-04-29 1978-09-26 Gunther Hertel Roller reinforced with a hard metal jacket
US4274185A (en) * 1977-07-05 1981-06-23 Sumitomo Electric Industries, Ltd. Roll assembly for use in rolling a wire rod
US4876875A (en) * 1987-12-04 1989-10-31 Coors Porcelain Company Supported ceramic guide roller
US5109585A (en) * 1990-10-24 1992-05-05 Uwe Kark Roll for a roll stand having an exchangeable roll ring and a divided roll body
US20120028772A1 (en) * 2009-03-12 2012-02-02 Sandvik Intellectual Property Ab Roller comprising a drive shaft and a roller ring, as well as a method for assembling such a roller

Also Published As

Publication number Publication date
SE322749B (de) 1970-04-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SANTRADE LTD., ALPENQUAI 12, CH-6002, LUCERNE, SWI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SANDVIK AKTIEBOLAG, A CORP. OF SWEDEN;REEL/FRAME:004085/0132

Effective date: 19820908