US3650314A - Apparatus for manufacturing stretch-formed products of high-melting metals - Google Patents

Apparatus for manufacturing stretch-formed products of high-melting metals Download PDF

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Publication number
US3650314A
US3650314A US878064A US3650314DA US3650314A US 3650314 A US3650314 A US 3650314A US 878064 A US878064 A US 878064A US 3650314D A US3650314D A US 3650314DA US 3650314 A US3650314 A US 3650314A
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United States
Prior art keywords
pair
rollers
strand
mold
set forth
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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US878064A
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English (en)
Inventor
Bruno Tarmann
Heinrich Vonbank
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.)
Gebrueder Boehler and Co AG
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Gebrueder Boehler and Co AG
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Publication date
Application filed by Gebrueder Boehler and Co AG filed Critical Gebrueder Boehler and Co AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • 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
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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

Definitions

  • the cast strand which exits from the mold is in a partially solidified state and has a molten core.
  • the withdrawing means comprise a pair of spaced grooved rollers which define a box-pass therebetween.
  • the bottom of the groove of each roller includes a convexedly curved portion, the camber of convexity of which amounts to 10-25 percent of the height of the box-pass.
  • Pressure producing means are operatively connected to the pair of grooved rollers. This pressure producing means being selectively variable in applying pressure at ratios ranging from 1:4 to 1:8.
  • This invention relates generally to an apparatus for continuous casting of molten metals, and in particular of nonalloyed and alloyed steels.
  • the working process according to this invention can be carried out with the existing working installations for working strands, which are suitable for reduction of the cross section of materials. lt is preferred that the working is effected by means of rollers.
  • the rollers of the driving installation in a continuous casting processing machine have been found suitable for car- LII rying out the process step of this invention.
  • the rollers of the driving installation may have the usual diameter that is prevalent in rolling mills of the described character. It has been found to be particularly advantageous to use grooved rollers in the fabrication of square and round strands.
  • the apparatus of the invention comprises at least one pair of grooved rollers the bottoms of the grooves of which are spaced at a distance H from each other.
  • the rollers are mounted downstream from the exit end of the ingot mold.
  • the bottom surface of the groove of each roller of the pair of grooved rollers includes a convexedly curved portion which projects a maximum distance H from the bottom surface proper.
  • the pair of grooved rollers not only deform the cast strand but also serve to withdraw the strand from the ingot mold.
  • a pair of grooved rollers shaped as described hereinabove exert a particularly strong and effective pressure on that portion of the cast strand where the molten core is situated and cause the leading point of the molten core to be shifted to a position upstream from the pair of grooved rollers.
  • the distances h must be 10-25 percent of the distance H in order to achieve this effect satisfactorily.
  • the diameter of the rollers of the pair of grooved rollers should be 3.5-5 times as large as the distance H.
  • the apparatus of the invention operates as follows:
  • a dummy strand leaves the mold and passes between the pair of grooved rollers which engage it and withdraw it from the mold.
  • the dummy strand has substantially the same cross section as the continuously cast strand before the latter has been deformed.
  • the pair of grooved rollers are provided with means (preferably hydraulic means) for varying the pressure applied by the pair of grooved rollers and the distance between the pair of grooved rollers. These means adjust the pair of grooved rollers so that it bears against the surface of the dummy strand with a relatively small pressure so as to not damage it.
  • the continuously cast strand is also withdrawn, and when the latter has reached the region between the pair of grooved rollers, the pressure exerted on it by the pair of rollers is increased four to eight times. This causes the pair of grooved rollers to gradually move together as the cast strand passes therebetween until the edges of the grooved rollers engage each other.
  • the continuously cast strand which has been worked in accordance with the process of this invention has, after working, still a sufficiently high temperature so that, if necessary, it can by means of the usual known steps be further deformed into the desired shapes and dimensions as will be described hereinbelow.
  • the prevailing thickness of the strand shell i.e., of the liquid core
  • the deformation by the pair of grooved rollers according to this invention should be effected with steels having a large solidification period with a liquid core having a thickness near the upper limit of the thickness range, whereas with steels having a small solidification period the deformation should be effected near the lower limit of the thickness range of 5 to 30 mm. of the liquid core.
  • the correct liquid core length can always be obtained by adjusting the rate of pouring of the molten metals or by adjusting the cooling rate of the strand.
  • the detennination of the required size of the worked over area of the hardened strand cross section can be obtained without difficulty, because the cross-sectional portion of the liquid core can be calculated as well as the prevail- I Cross section of mold ing thickness of the liquid core.
  • the cross-sectional portion of the liquid core can be calculated as well as the prevail- I Cross section of mold ing thickness of the liquid core.
  • FIG. I is a schematic elevational view of an installation in accordance with this invention.
  • FIG. 2 is a cross-sectional elevational view on a larger scale illustrating the continuously cast strand passing through the pair of grooved rollers;
  • FIG. 3 is a view along line 3--3 of FIG. 2 illustrating a first embodiment of the pair of grooved rollers
  • FIG. 4 is a view along line 3-3 of FIG. 2 illustrating a second embodiment of the pair of grooved rollers.
  • FIG. 1 there is illustrated an open ended reciprocating mold l in which a continuously cast strand 4 partially I solidifies.
  • the partially solidified strand which emerges from the mold 1 passes through the curved cooling installation 2 which comprises a plurality of water sprays.
  • the partially solidified strand 4 then passes through a curved insulated chamber 3 in which the temperature gradient of the solidified portion of the strand 4 is reduced.
  • the apparatus of the invention further includes a working installation of four contiguous pairs of rollers 5, 6, 7 and 8 between each ofwhich the strand 4 passes.
  • the partially solidified strand 4 which enters between the first pair or rollers will have a liquid core of 22 mm. in thickness.
  • the cross section of the strand 4 is first reduced to I50 X 70 respectively 100mm. (the strand is no longer truly rectangular after passing between the first pair of rollers as can be noted in FIGS. 3 and 4) between the pair of rollers 5, then to 100 X 107 mm. between the pair of rollers 6, then I I X 72 mm. between the pair of rollers 7, and then 80 mm square between the pair of rollers 8.
  • the main step of effecting a welding together of the solidified wall portions of the cast thread 4, and thereby the shifting upstreamwards of the leading edge of the molten core 9 is performed by the first pair of grooved rollers 5.
  • This first pair of rollers causes a 36 percent reduction of the cross-sectional area of the cast strand 4 whereby the crosssectional area of the solidified portion of the cast strand is reduced by 34 percent.
  • the pair of rollers 5, each of which has a symmetrical outer configuration comprises outer portions 50 which are of substantial cylindrical shape. Adjacent to these outer portions, there are respectively arranged frustoconical portions 5b. Adjacent to the portions 5b extends the bottom surface 5c of the groove 5d defined by the roller 5. In this embodiment, the portion R projecting from the bottom surface 5c at a distance h is not curved but is flat.
  • a curved portion having a chamber h projects from the bottom surface 50.
  • the configuration of the cast strand 4 prior to being deformed by the pair of rollers 5', is illustrated by a dotted line.
  • the distance between the bottom surface 50' of the pair of rollers 5' is indicated by reference letter H.
  • the pairs of rollers 5, respectively 5 will deform the cast strand 4 so that it will substantially correspond in shape to the passage defined between the pair of rollers 5, respectively 5' when the cylindrical portions 5a, respectively 5a come into contact with each other. Such a contacting between these cylindrical portions comes about after a short run-in stage of the cast strand.
  • the pairs of rollers 5, respectively 5' not only shape the cast strand but also effect its withdrawal from the mold 1.
  • the withdrawal of the cast strand is performed with the aid of a dummy strand (not illustrated).
  • This dummy strand should, of course, not be deformed, and therefore, the pressure applied to the dummy strand should not be excessive in order to avoid damaging it.
  • the pair of grooved rollers 5, respectively 5 are provided with pressure application means 5" which preferably are in form of a hydraulic piston and cylinder arrangement. Similar means may be provided for the pair of rollers 6, 7 and 8.
  • the dummy strand has substantially the same cross section as the continuous cast strand 4 before its deformation.
  • the distance h in the pair of rollers 5, 5' should be 10 to 25 percent of the distances H.
  • the diameter of the rollers of the pair of rollers 5, 5 should be 3.5 to 5 times as large as the distance H. It has been found advantageous to provide variable pressure application means 5" which have a range of variability ranging from 1:4 to 1:8.
  • At least one additional pair of rollers be pro- 5 vided adjacent to the pair of grooved rollers 5, 5".
  • This additional pair of rollers 6 should have its axes in a plane perpendicular to the plane defined by the axes of the pair of rollers 5, 5'.
  • Such an arrangement can be supplemented with additional pairs of rollers 7 and 8.
  • the pair of rollers 6 should preferably also have a groove which has, however, a flat bottom, that is, no projecting portion.
  • combination withdrawing and shaping means for withdraw ing said metal strand in a partially solidified state in which the metal strand has solid exterior and a liquid core and for stretch-forming it so that the solid exterior and a liquid core and for stretch-forming it so that the solid exterior is welded together and substantially reduced in cross section and the leading edge of said liquid core is displaced to a position upstream from said combination withdrawing and shaping means,
  • said combination withdrawing and shaping means comprising a first pair of oppositely mounted rollers being spaced a predetermined first distance from each other and defining a box-pass therebetween, each roller of said first pair of rollers having a bottom surface,
  • each roller of said first pair of rollers being 10 about 3.5 to 5 times said first distance
  • pressure application means being operatively connected to said first pair of rollers for applying a withdrawal pressure and subsequently applying a shaping pressure 4-8 times greater than said withdrawal pressure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Rolling (AREA)
US878064A 1969-11-19 1969-11-19 Apparatus for manufacturing stretch-formed products of high-melting metals Expired - Lifetime US3650314A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US87806469A 1969-11-19 1969-11-19

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US3650314A true US3650314A (en) 1972-03-21

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US878064A Expired - Lifetime US3650314A (en) 1969-11-19 1969-11-19 Apparatus for manufacturing stretch-formed products of high-melting metals

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US (1) US3650314A (index.php)
JP (1) JPS503750B1 (index.php)
CH (1) CH526356A (index.php)
DE (1) DE2056473A1 (index.php)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3766962A (en) * 1971-02-01 1973-10-23 I Rossi Method of continuously casting a slab
US3794106A (en) * 1971-05-19 1974-02-26 V Barsukov Plant for producing a metal band from a melt
US3837392A (en) * 1971-11-18 1974-09-24 I Rossi Apparatus for continuously casting steel slabs
US3837391A (en) * 1971-02-01 1974-09-24 I Rossi Continuous casting apparatus
US20030164251A1 (en) * 2000-04-28 2003-09-04 Tulloch Rory Mccrae Expandable apparatus for drift and reaming borehole
US20030213578A1 (en) * 2002-04-08 2003-11-20 Sei Hiraki Continuous casting method, continuous casting apparatus and continuously cast steel slab
US20050067135A1 (en) * 2001-11-06 2005-03-31 Hans Streubel Method and casting machine for production of casting bars in the shape of billets or blocks

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55131102U (index.php) * 1979-03-12 1980-09-17
GB8602163D0 (en) * 1986-01-29 1986-03-05 Davy Mckee Shiffield Ltd Metal strip

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US395684A (en) * 1889-01-08 Method of making rods
US494659A (en) * 1893-04-04 Means for manufacturing metal bars or rods
US3157920A (en) * 1962-04-03 1964-11-24 Concast Ag Continuous casting plant with deflection of the casting
CH392785A (de) * 1961-02-08 1965-05-31 Lugert Josef Stranggiessanlage mit waagrechtem Abzug
US3358358A (en) * 1964-12-31 1967-12-19 United States Steel Corp Method of reducing width of metal slabs
US3393727A (en) * 1965-10-22 1968-07-23 Koppers Co Inc Continuous casting machine having billet shape maintaining rollers

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US395684A (en) * 1889-01-08 Method of making rods
US494659A (en) * 1893-04-04 Means for manufacturing metal bars or rods
CH392785A (de) * 1961-02-08 1965-05-31 Lugert Josef Stranggiessanlage mit waagrechtem Abzug
US3157920A (en) * 1962-04-03 1964-11-24 Concast Ag Continuous casting plant with deflection of the casting
US3358358A (en) * 1964-12-31 1967-12-19 United States Steel Corp Method of reducing width of metal slabs
US3393727A (en) * 1965-10-22 1968-07-23 Koppers Co Inc Continuous casting machine having billet shape maintaining rollers

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3766962A (en) * 1971-02-01 1973-10-23 I Rossi Method of continuously casting a slab
US3837391A (en) * 1971-02-01 1974-09-24 I Rossi Continuous casting apparatus
US3794106A (en) * 1971-05-19 1974-02-26 V Barsukov Plant for producing a metal band from a melt
US3837392A (en) * 1971-11-18 1974-09-24 I Rossi Apparatus for continuously casting steel slabs
US20030164251A1 (en) * 2000-04-28 2003-09-04 Tulloch Rory Mccrae Expandable apparatus for drift and reaming borehole
US20050067135A1 (en) * 2001-11-06 2005-03-31 Hans Streubel Method and casting machine for production of casting bars in the shape of billets or blocks
US20030213578A1 (en) * 2002-04-08 2003-11-20 Sei Hiraki Continuous casting method, continuous casting apparatus and continuously cast steel slab
EP1356880A3 (en) * 2002-04-08 2005-03-16 Sumitomo Metal Industries, Ltd. Continuous casting method, continuous casting apparatus and continuoulsly cast steel slab
US7086450B2 (en) 2002-04-08 2006-08-08 Sumitomo Metal Industries, Ltd. Continuous casting method, continuous casting apparatus and continuously cast steel slab

Also Published As

Publication number Publication date
CH526356A (de) 1972-08-15
DE2056473A1 (de) 1971-05-27
JPS503750B1 (index.php) 1975-02-08

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