US3670381A - Rolls and rollers particularly for continuous casting plants, bar deformation plants and for hot rolling mills operated at low rolling speeds - Google Patents

Rolls and rollers particularly for continuous casting plants, bar deformation plants and for hot rolling mills operated at low rolling speeds Download PDF

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Publication number
US3670381A
US3670381A US55830A US3670381DA US3670381A US 3670381 A US3670381 A US 3670381A US 55830 A US55830 A US 55830A US 3670381D A US3670381D A US 3670381DA US 3670381 A US3670381 A US 3670381A
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United States
Prior art keywords
segments
tool
plants
set forth
core
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US55830A
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English (en)
Inventor
Rudolf Schoffmann
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Voestalpine AG
Voest AG
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Voestalpine AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1287—Rolls; Lubricating, cooling or heating rolls while in use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/008—Rollers for roller conveyors

Definitions

  • ABSTRACT The invention proposes rolls and rollers, particularly for con- [211 Appl 55330 tinuous casting plants, bar deformation plants and hot rolling mills operated at low rolling speeds, in which the improvement resides in that the working body of the rolls or rollers, respectively, is formed by a plurality of segments arranged side by [30] 93" Apphcauon Prlomy. Dam 7 side with play, which segments are provided with key-like pro- .luly 25, 1969 Austria ..A 7189 jecfions engaging with correspondingly formed guiding a grooves arranged at the roll or roller core.
  • the core may be made of material of high strength, capable of absorbing great [52] US. Cl ..29/;2;1,b29/11 bending stresses, and the segments may be made of mamrial [5 f CI 3 resistant to heat and wear. Owing to the division of the work- [58] new of Search" ing tools into two units and the provision of play between seg- 164/76 282 ments, heat cracks and ruptures are precluded.
  • the invention relates to rolls and rollers, particularly for continuous casting plants, bar deformation plants and hot rolling mills operated at low rolling speeds.
  • v Rolls and rollers in continuous casting and bar deformation plants are used not only for shaping but also for supporting, drawing, bending and straightening cast bars. They are exposed to specific stresses.
  • the speed with which the cast bars are fed, or lowered in continuous casting or bar deformation plants lies between about 0.6 and 1.5 m/min.
  • the speed with which the material to be rolled is pushed into a planetary mill by means of pushing rolls arranged in front of such mill is about the same.
  • therolling material runs through the rolling stands with a speed of between 30 and 600 m/min.
  • rollers and rolls in continuous casting or bar deforma-' tion plants and in a pushing stand arranged before a planetary mill are for a far longer time in contact with the bar having a surface temperature of between about l,000 and 'l,300 C than the rollers and rolls in other rolling mills. In operation they are locally highly overheated and exposed to thermal shock stresses as .a result of the necessary cooling. It is therefore imperative that such rolls and rollers be provided with resistance to the formation of cracks and ruptures which might be caused by heat stresses and with adequate strength, including as small a notch sensitivity as possible, and suffic'ient resistance to wear.
  • Pulling and straightening rollers and rolls for shaping bars have so far been produced from steels with a composition of 0.4 to 0.7 C, 0.5 to L6 Cr, 0.20 to 0.90 Mo and 0.40 V, balance substantially Fe.
  • Rolls with this analysis are well suited as rolls for hot rolling but they have not proved satisfac' tory for use in continuous casting or bar deformation plants; when they are used in such plants substantial chill cracks developed rapidly at the surface and ruptures, particularly ruptures going through the body of the rolls occurred.
  • the reason for such damage lies in the fact that such rollers or rolls According to a preferred embodiment the segments and the roll or roller core are made of different materials.
  • the segments may be made of material resistant to heat and wear, preferably of heat resistant steel being composed of 0.15 to 0.30 C, 0.20 to 0.50 Si, 0.40 to 0.70 Mn, 0 to 0.35 P, 0 to 0.035 S, 0.50 to 3.0 Cr and 0.40 to 1.0 Mo, if desired up to 1.5 percent nickel and up to 0.5 percent vanadium and up to 1 percent tungsten, balance iron.
  • the roll or roller core may be made of material of high strength, capable of absorbing great bending stresses, preferably of steel composed of 0.5 to 0.7 C, 0.2 to 0.6 Si, 0.6 to 1.0 Mn, balance Fe.
  • FIG. 1 is a longitudinal sectional view of a roll
  • FIG. 2 is a vertical sectional view along the line ll-ll of FIG. 1, and
  • FIG. 3 is an enlarged part of the longitudinal sectional view according to FIG. 1.
  • FIGS. 4, 5 and 6 show similar illustrations of another embodiment'of the invention.
  • FIG. 4 is a longitudinal sectional view of the upper half of a roll.
  • FIG. 5 is a vertical sectionalview of the whole roll taken along the line V V of FIG. 4 during mounting, and FIG. 6
  • V V shows the samesectional view (V V) after mounting is are subjected to a different kind of stresses which are not compensated by an intensive cooling, but, on the contrary, even aggravated.
  • Rolls with a high carbon content are sensitive against rapid heating and change of temperature.
  • the invention is aimed at avoiding the described disadvantages and difficulties by creating rolls and rollers for use'in continuous casting plants, bar deformation plants, and hot rolling mills operated at low rolling speeds, having a long life and durability, and a high resistance against bending stresses, wearing and the formation of cracks.
  • the body of the rolls or rollers, respectively is formed by a plurality of segments arranged side by side with play, which segments are provided with key-like projections engaging with appropriately formed guiding grooves arranged at the roll or roller core, respectively.
  • the side faces of the segments are slightly inclined towards each other so that the play gaps are slightly conically widening towards the periphery of the roll.
  • the key-like projections are designed to be dovetail shaped.
  • the grooves may be arranged at the surface of the roll or roller core concurrently and in parallel with the longitudinal axis of the roll or roller and the individual rows of segments may be held together by connecting means, e.g. screws, a holding ring surrounding the roll or roller core, respectively, being provided for fixing the segments; it is, however, also possible to arrange the grooves to be concurrent in circumferential direction of the roll or roller core surface, and to provide at least one further recess extending over the total body length in a direction transverse to said grooves through which recess the individual segments may laterally be slid into the groove and in which recess a holding rail for fixing said segments may be inserted after mounting.
  • numeral 1 denotes the roll core 1 into whose cylindrical surface grooves 2 are milled to be side by side and parallel to each other in the direction of the longitudinal axis of the roll.
  • These grooves have a dove-tail cross section. They serve for taking up a plurality of segments 3 provided at their bottom sides with dove-tail projections 4 which fit into the grooves 2 in key-fashion.
  • the segments 3 may be inserted into the grooves 2 with their key-like projections 4 from both sides of the roll.
  • a recess 7 is provided for receiving a holding ring 8 made of two parts which serves for fixing the segments 3.
  • This holding ring need not be arranged in the middle of the roll but may be arranged in any other part of the roll, e.g. at the margin of the roll.
  • Each segment 3 is provided with a bore 5; together, these bores form a longitudinal'canal through which screws 9 are putas soon as one row of segments has been built in.
  • the individual rows of segments which are supported by the holding ring 8 are held together.
  • segments 3' are arranged which are each provided in the projection 4 with a small angular recess for receiving the holding ring. It is also possible that all segments are provided with such a recess in which case only a single form of segments is necessary for the whole roll body.
  • FIG. 1 the roll is shown in a condition during mounting. From the left hand side two segments 3, 3' had been inserted into the upper groove 2. The lower groove is already filled with segments, illustrating the arrangement when mounting has been completed.
  • a play 16 is present, in axial as well as in circumferential direction, so that the segments may freely expand in any direction during operation.
  • the side faces 6, 6' of the individual neighboring segments are slightly inclined towards each other, so that the play 16 between two segments is greater at the surface than at the core.
  • the dimensions of the play 16 depend on the surface temperature and on the dimensions of the individual segments; as a rule, the play will amount to some tenths of a millimeter.
  • grooves 1 1 are machined into the cylindrical surface of the core in circumferential direction of the roll and parallel to each other; segments 12 with dove-tail projections 13 may be inserted into them.
  • FIG. 5 shows the roll when mounting of the segments 12 has not been completed yet.
  • a recess 14 is provided perpendicularly to the circumferential grooves 11 in longitudinal direction of the roll; the width of this recess is somewhat greater than that of the projections 13 of the segments 12.
  • the segments 12 are inserted laterally through the recess 14 into the respective groove 11 and then moved on in circumferential direction (direction of arrows in FIG. 5).
  • each of these units may be made of the most suitable and qualitatively best material, without having to make do with compromises or less favorable interim solutions.
  • the core is made of high-strength, unalloyed material which is capable of absorbing high bending stresses, which material would otherwise be unsuitable for hot rolling rolls in view of its liability to the formation of cracks.
  • the core remains practically free from heat influences emanating from the material to be rolled and only the segments are affected by them. Therefore, the segments may be made of steel which is resistant to heat and wear, the characteristic of strength being not so important for them.
  • the segments may be designed relatively small so as to reduce the costs for the material. If particularly high stresses are exerted on the segments they may be made of a metal ceramic material, e.g. of molybdenum and circonium oxide.
  • the segments and the core may be made of the same material if the exchange of the segments may be carried out at any time and without having to stop the operation, which may be an inexpensive solution in plants which are not continuously operated. The advantages of the invention thus may be exploited in all cases of application.
  • a revolving tool particularly for use as rolls and rollers in continuous casting plants, bar deformation plants and hot rolling mills operated at low rolling speeds comprising a core made of material with a high strength and capable of absorbing great bending stresses, and having a plurality of guiding grooves on its periphery, and a body formed of a plurality of segments arranged side by side with play, the segments being made of material resistant to heat and wear and having keylike projections for engagement with said guiding grooves.
  • the core is made of steel composed of 0.5 to 0.7 C, 0.2 to 0.6 Si, 0.6 to 1.0 Mn, balance iron.
  • a revolving tool particularly for use as rolls and rollers in continuous casting plants, bar deformation plants and hot rolling mills operated at low rolling speeds, comprising a core made of heat-resistant steel consisting of 0.15 to 0.30 C,

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US55830A 1969-07-25 1970-07-17 Rolls and rollers particularly for continuous casting plants, bar deformation plants and for hot rolling mills operated at low rolling speeds Expired - Lifetime US3670381A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT718969A AT291454B (de) 1969-07-25 1969-07-25 Walzen und Rollen insbesondere für Stranggußanlagen, Strangverformungsanlagen, sowie für mit niedriger Walzgeschwindigkeit betriebene Warmwalzwerke

Publications (1)

Publication Number Publication Date
US3670381A true US3670381A (en) 1972-06-20

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US55830A Expired - Lifetime US3670381A (en) 1969-07-25 1970-07-17 Rolls and rollers particularly for continuous casting plants, bar deformation plants and for hot rolling mills operated at low rolling speeds

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US (1) US3670381A (en])
AT (1) AT291454B (en])
BE (1) BE753625A (en])
CA (1) CA937788A (en])
CH (1) CH528932A (en])
CS (1) CS152478B2 (en])
DE (1) DE2030322A1 (en])
ES (1) ES188324Y (en])
FR (1) FR2053148B1 (en])
GB (1) GB1310560A (en])
SE (1) SE351572B (en])

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3760477A (en) * 1970-11-10 1973-09-25 Koppern & Co Kg Roller-type press
USRE28581E (en) * 1970-11-10 1975-10-28 Roller-type press
US3997370A (en) * 1975-11-17 1976-12-14 Bethlehem Steel Corporation Method of hot reducing ferrous and ferrous alloy products with composite martensitic nodular cast chill iron rolls
US6910571B1 (en) * 2003-05-15 2005-06-28 Dorner Mfg. Corp. Multi-section conveyor drive roller
CN111906269A (zh) * 2020-08-07 2020-11-10 云南玉溪玉昆钢铁集团有限公司 一种便拆式耐磨型新型炼钢厂连铸机钢坯输送辊

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2258235B1 (en]) * 1974-01-21 1981-02-06 Voest Ag
DE2902825C2 (de) * 1979-01-25 1984-06-28 Mannesmann AG, 4000 Düsseldorf Walze für Warmgut, insbesondere Stütz- und/oder Transportwalze für Stahl-Gießstränge
DE2936949C2 (de) * 1979-09-10 1981-11-26 Mannesmann AG, 4000 Düsseldorf Strangführungsrolle
JPS59118630A (ja) * 1982-12-27 1984-07-09 Toshiba Corp 紙葉類の取出し装置
JPS6130654A (ja) * 1984-07-21 1986-02-12 Kanto Tokushu Seikou Kk アルミニウム連続鋳造用ロ−ルシエル鋼
PL187208B1 (pl) 1999-01-25 2004-06-30 Boart Longyear Gmbh & Co Kg Zespół noża obrotowego zwłaszcza do maszyn górniczych
DE19910475C2 (de) 1999-03-10 2001-06-13 Spanntec Gmbh Spann Und Wickel Rotierbares Tragelement
CN115532838B (zh) * 2022-10-09 2023-11-21 江苏锦航机械制造有限公司 一种带有裂缝填补结构的轧辊及其使用方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US912254A (en) * 1907-11-29 1909-02-09 Sailer And Whitmore Machine Company Press-roll for paper-making machines.
US996970A (en) * 1909-06-03 1911-07-04 Stoughton Rubber Company Rubber-covered roll.
US1209736A (en) * 1916-05-29 1916-12-26 Anton T Lueckenbach Press-roll for paper-making machines.
US1570231A (en) * 1922-12-28 1926-01-19 Ammiel F Decker Padding for ironing rolls
US1618704A (en) * 1923-07-18 1927-02-22 Harry H Straus Cork facing
US2770082A (en) * 1953-08-31 1956-11-13 Whitesell Harry Grinding and polishing and the like

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US912254A (en) * 1907-11-29 1909-02-09 Sailer And Whitmore Machine Company Press-roll for paper-making machines.
US996970A (en) * 1909-06-03 1911-07-04 Stoughton Rubber Company Rubber-covered roll.
US1209736A (en) * 1916-05-29 1916-12-26 Anton T Lueckenbach Press-roll for paper-making machines.
US1570231A (en) * 1922-12-28 1926-01-19 Ammiel F Decker Padding for ironing rolls
US1618704A (en) * 1923-07-18 1927-02-22 Harry H Straus Cork facing
US2770082A (en) * 1953-08-31 1956-11-13 Whitesell Harry Grinding and polishing and the like

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3760477A (en) * 1970-11-10 1973-09-25 Koppern & Co Kg Roller-type press
USRE28581E (en) * 1970-11-10 1975-10-28 Roller-type press
US3997370A (en) * 1975-11-17 1976-12-14 Bethlehem Steel Corporation Method of hot reducing ferrous and ferrous alloy products with composite martensitic nodular cast chill iron rolls
US6910571B1 (en) * 2003-05-15 2005-06-28 Dorner Mfg. Corp. Multi-section conveyor drive roller
CN111906269A (zh) * 2020-08-07 2020-11-10 云南玉溪玉昆钢铁集团有限公司 一种便拆式耐磨型新型炼钢厂连铸机钢坯输送辊

Also Published As

Publication number Publication date
FR2053148A1 (en]) 1971-04-16
ES188324Y (es) 1974-09-16
FR2053148B1 (en]) 1973-03-16
CA937788A (en) 1973-12-04
SE351572B (en]) 1972-12-04
CS152478B2 (en]) 1973-12-19
CH528932A (de) 1972-10-15
ES188324U (es) 1974-03-01
DE2030322A1 (de) 1971-02-04
BE753625A (fr) 1970-12-31
AT291454B (de) 1971-07-12
GB1310560A (en) 1973-03-21

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