EP0942795A1 - Machine a couler de type a roue rotative - Google Patents

Machine a couler de type a roue rotative

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Publication number
EP0942795A1
EP0942795A1 EP96922708A EP96922708A EP0942795A1 EP 0942795 A1 EP0942795 A1 EP 0942795A1 EP 96922708 A EP96922708 A EP 96922708A EP 96922708 A EP96922708 A EP 96922708A EP 0942795 A1 EP0942795 A1 EP 0942795A1
Authority
EP
European Patent Office
Prior art keywords
mold
wall
radius
wheel
segment
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.)
Granted
Application number
EP96922708A
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German (de)
English (en)
Other versions
EP0942795B1 (fr
Inventor
William Lyon Sherwood
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority claimed from PCT/CA1996/000473 external-priority patent/WO1998003286A1/fr
Publication of EP0942795A1 publication Critical patent/EP0942795A1/fr
Application granted granted Critical
Publication of EP0942795B1 publication Critical patent/EP0942795B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Definitions

  • the invention relates to the continuous casting of steel and other metals and, more particularly, to an improved rotary wheel-type casting machine for continuous castmg of billets, blooms, slabs, bars, rods and the like.
  • peripheral closure of the casting mold channel generally is accomplished by either a moving, endless metal belt pressed against the wheel rim by rollers to realize closure and synchronous peripheral motion with the wheel, or by multiple closure segments, or clamshell-style molds, spaced in abutting sectors around the entire wheel circumference and rotating with it, which are closed proximate the point of pouiing steam entry, and reopened at bar exit from the casting sector during each revolution of the wheel.
  • Known technology also includes a stationary closure belt, pressed in frictional contact against the wheel periphery spanning the casting arc.
  • Disadvantages of the endless belt include: heat from the casting warps the belt, also imparting a wrinkled and warped surface to the cast stock on the belt side of the section; return rollers are bulky and occupy useful space; a closed and sealed collector and conduit for spent belt-cooling water is difficult, if not impossible, to realize; belts require a regular schedule of replacement through wear and warpage; belts do not maintain uniform contact and pressure to hold the casting firmly against the wheel as the casting proceeds around the wheel; and maximum width of cast stock is very limited due to belt flexure and warpage. Despite these disadvantages, most commercial production machines employ a moving endless flexible metal belt to effect mold closure.
  • Disadvantages of segmented molds include mechanical complexity with inherently very large number of cooperating parts and components; difficulty in maintaining necessary close tolerances between large number of interacting wheel sectors usually 24 or 36, each sector including a clam-shell mold pair, inlet-outlet water piping, mechanical hinging and actuation; problems with metal and slag splashes interfering with mold closure and mold-mold interfaces; and additional tundish pouring clearance necessary to accommodate individual mold sector height above metal meniscus.
  • Disadvantages of the static closure are incidence of sticking between the moving surface of the initially solidified stock and the stationary surface of the closure, resulting in possible skin ruptures and the like; also wear and operating problems associated with contact friction between wheel perimeter surface and the closure surface.
  • Casting wheels having an oscillating closure have also been proposed. These have not offered practical support of the oscillating castmg shoe assembly along with close control of the clearance O 98/03286 dimension between channel edge surfaces and the mating edges of the oscillating shoe, or a low-inertia closure assembly allowing rapid oscillation, in combination with close clearance control. Further, the prior art lacks means for precise positioning of containment rollers relative to the wheel rim, along with control of the containment roller pressure against the cast section below the mold, together with capture and disposal of spent coolant, as an integral part of the wheel assembly, rather than of a bulky external structure without coolant capture. Practical means for changing the width of cast slab sections, without changing molds, is also not evident in the prior art of rotary wheel casters.
  • Another object is to provide a casting machine which realizes a much higher output per strand of equivalent cross-section than do conventional vertical, curved or horizontal casting machines, and thereby can involve less cost and complexity for equivalent output.
  • a further object is to provide, in various embodiments, a casting machine capable of casting billet and bloom type sections for rolling into rod, bar and tubing sections and, in a modified embodiment, flat slab sections suitable for subsequent rolling into plate, sheet and strip products, with the invention particularly suitable for casting near net shape products such as thin slabs and beam blanks. Varying the width of slab section without changing the wheel channel is a related object.
  • An additional object is to provide a casting machine in which the principal force and pressure propelling the cast section forward is inherently effected at the location of the cross section being cast, rather than by the pulling force and tension created by the withdrawal pinch rollers following exit from the casting mold and containment spray chamber area, thus eliminating the main source of skin stresses and tears, with associated substantial increase in casting rate.
  • a still further object is to provide a casting machine capable of casting product with very good surface and internal metallurgical quality.
  • the invention comprises basic features in common with the prior ait, namely a rotary wheel continuous casting machine comprising a rotary wheel incorporating a circumferential inner-radius mold wall with two parallel annular inner mold-wall edges, integral to the wheel rim; a non-rotating casting- moid sector (11) comprising at least one rigid mold segment (10), incorporating an outer-radius mold wall having two outer mold-wall edges (21 ) which are parallel to, and interface with, said inner mold-wall edges (9), forming a casting mold envelope (43) between said inner (8)and outer-radius (12) mold walls; molten metal pouring means adapted for introducing molten metal proximate the entry end (42) of said mold envelope (43) to pass through in the casting direction of circular wheel rotation and at least partially solidify a cast metal section for exit from the exit end (20) of said mold envelope (43); external support means of said segment (10) adapted to maintain it in a substantially fixed angular position in relation to said wheel; reciprocal oscillation means connected to said segment (10)
  • a preferred embodiment includes two of said guide tracks (5,6), one located on either side of the central plane of rotation of said inner-radius mold wall (8), and at least two of said followers (15) for each of said guide tracks (5,6), and said followers comprise cam roller followers (15) which run in contact with said track (5,6) and incorporate means of restraining relative movement in the axial as well as radial direction of said cam roller followers (15) relative to said track and thereby between said inner (9) and outer (12) mold-wall edges during wheel rotation.
  • each said guide track (5,6) typically face radially outwards from the rotation axis of said wheel, and said cam follower rollers (15) ride on these surfaces and thereby do not restrain said casting-mold segments (10) from movement in the radially outward direction.
  • the wheel carries another annular balancing guide track (25) with faces directed radially inwards, complementary to each outward-facing track (5,6), against which rides at least one balancing cam follower (27) attached to said non-rotating casting-mold segment (10) thereby maintaining contact between said guide track followers (15) and said guide track (5,6) by radially restraining movement of said casting mold segment ( 10) in the direction radially outwards from said wheel.
  • the casting mold segments (10) also cany a supplementary guide track (115) against which fluid-pressure loaded balancing cam followers (114) maintain continuous pressure and contact of the guide track followers (15) against the wheel rim, with the balancing followers (114), in turn, being supported and positioned from a fixed support of the machine housing, or the like.
  • the supplementary track preferably includes a reverse capturing flange (116) for the balancing follower, enabling the casting segments to be lifted off the wheel and held in suspension during inspection or maintenance.
  • Mold segments (10) most suitably comprises a rigid, semicircular enclosure having two box side walls ( 13), a box outer cover wall ( 143) and a box inner wall carrying said outer-radius mold wall ( 12) on its face, in which said external support means and said oscillation means are attached to the segment (10), thereby being adapted to oscillate said outer-radius mold wall (12) back and forth in the circumferential direction about a substantially fixed angular location on the casting wheel periphery.
  • Spray nozzles (38) are suitably contained within said enclosure directed radially inwards, to spray coolant directly against said outer-radius mold walls (12) and spent coolant is confmed within the enclosure and discharged via an appropriate outlet duct (40).
  • the enclosure may form a pressurized water jacket, internally baffled to provide an annulus for flow of pressurized coolant against the outside of mold-wall (12).
  • Another aspect of the invention provides a containment-roller sector (28) adjoining the mold envelope exit end (20), similar to the casting mold sector (11) but carrying transverse containment idler rollers (69) journalled in bearings (72) supported by the segment side walls (13), with faces positioned and adapted to press radially inwards against the outer face of the section being cast to maintain the inner face of the section pressed against the inner-radius mold wall (8), the tangential component of this pressure acting to exert a circumferential forward propelling force on the section in the casting direction.
  • Means are provided for controlling the radial movement and pressure of these rollers (69) against the face of the section being cast.
  • aspects of the invention include apparatus for positioning of movable side-dam bars (44) adapted for varying the width of the metal section being cast; a tangential departure (67) of the outer mold-wall at the entry end (42) of the mold envelope to provide improved access for introducing liquid metal; a mold closure guiding arrangement applicable to spray-cooled solid-block copper casting wheel mold rings (93); and a universal hinge coupling assembly (120) connecting adjoining segments (10, 90) which allows each individual to track independently on the wheel rim, without coupling backlash.
  • Fig. 1 is an illustrative side view of a rotary wheel casting machine embodiment according to the invention, including a wheel sector illustrated in section, along the pi we of rotation intersecting the mold center line;
  • Fig. 2 is a section view along plane 2-2 of Fig. 1 incorporating a moid cavity of general shape suitable for the casting of blooms, billets, bars and rods applicable to production of long products;
  • Fig. 3 is a section view along plane 3-3 of Fig. 1;
  • Fig. 4 is a side view of the apparatus illustrated in Fig. 3; and Fig. 5 is a corresponding section view to that illustrated in Fig. 2 incorporating a mold cavity of general shape suitable for casting slabs, plates, sheets .and strip, as applicable to the production of flat-rolled products;
  • Fig. 6 is a partial front elevation view of a mold-width adjustment mechanism adapted for casting various flat-rolled product widths without changing the wheel mold;
  • Fig. 7 is a sectional view along plane 7-7 of Fig. 6;
  • Fig. 8 is an illustrative partial sectional view of an alternative embodiment substituting containment idler rollers in place of the outer mold wall in the lower portion of the non-rotating casting sector;
  • Fig. 9 is a partial top view along plane 9-9 of Fig. 8
  • Figs. 10, and 11 illustrate two variations for containment idler roller bearing support, positioning and pressure application
  • Fig. 12 is a corresponding section view of that illustrated in Figs. 2 and 5, incorporating a mold cavity adapted for the near net shape casting of structural sections and the like;
  • Fig. 13 is a split cross-section illustration of a containment roller segment embodiment
  • Fig. 14 is a partial side view of the roller segment of Fig. 13;
  • Fig. 15 is a side elevation view of an entry mold segment assembly;
  • Fig. 16 is a section view along plane 16-16 of Fig. 15;
  • Fig. 17A is a section view along plane 17A of Fig. 15;
  • Fig. 17B is a section view along plane 17B of Fig. 15;
  • Fig. 18 is a section view along plane 18- 18 of Fig. 16;
  • Fig. 19 is a side elevation general arrangement view of an embodiment incorporating mold and roller segment balancing devices supported directly from the fixed machine frame;
  • Figs. 20, 21 and 22 illustrate details of the externally supported balancing assemblies as shown in Fig.
  • Fig. 23 is a section view of a suitable segment oscillator assembly
  • Fig. 24 is a section view along plane 24-24 of Fig. 23
  • Fig. 25 is a side elevation view of a containment roller segment embodiment
  • Fig. 26 is a section view along plane 26-26 of Fig. 25
  • Fig. 27 is a section view along plane 27-27 of Fig. 25
  • Fig. 28 is a section view along plane 28-28 of Fig. 25
  • Fig. 29 is a section view along plane 29-29 of Fig. 27.
  • wheel hub assembly 1 is journalled upon bearings mounted on fixed supports and the rotated by an appropriate electro-mechanical or hydraulic drive unit, preferably at variable and controlled speed.
  • the rotary wheel structure comprises a solid-disc body 2 with radial stiffener ribs 19 spanning between hub 1 and U-shaped wheel rim 24, also defining cooling water jacket annulus 4.
  • a typical wheel size would be 2-4 meters in diameter, although a wide range of sizes are possible.
  • Wheel mold cooling water is introduced, and spent water discharged, via appropriate rotary union assemblies incorporated into hub assembly 1, supplied to and returned from wheel rim 24 via appropriate wheel mounted water pipes 35.
  • the details of this aspect and numerous other features of the wheel casting machine are not shown or described herein, being well known in the art, and with many known and obvious options as to selection and configuration available.
  • Casting wheel rim 24 carries .annular inner radius mold-wall support rings 3 and also two outer- radius mold-wall edge guide trad s 5, 6 comprising cylindrical radial surfaces, directed radially outward, one on either side of axial central plane of rotation 7 of the inner radius mold wall, in the embodiment illustrated.
  • the inner radius mold-wall 8 may also include side faces 18 extending radially outwards, as in the embodiment illustrated for casting of a square cross section, approximately at right angles to the inside face of mold wall 8.
  • the mold wall usually of copper or copper alloy, is fastened to support rings 3 such as by screws spaced around the wheel rim periphery.
  • side faces 18 are tapered to diverge transversely outwards, for example, at a slope of 1 or 2 per cent, thereby assuring clearance for tangential discharge of the cast metal section at exit 20, without edge friction or binding between the section and side faces 18.
  • Non-rotating casting mold sector 11 incorporates outer radius mold-wall 12 as its inner face thereby forming a casting mold envelope 43 between said inner 8 and outer 12 mold walls.
  • Sector 11 may comprise a single rigid circumferential mold segment or be made up in multiple mold segments 10.
  • sector 11 comprises three rigid semicircular mold segments 10 having the abutting ends of segment side walls 13 interleaved and connected together by hinge pins 14.
  • Each segment 1 has four cam track followers 15 mounted on side walls 13 as two opposite pairs, positioned to run in contact with guide tracks 5,6.
  • the roller mounting studs incorporate eccentric bushings 16, to enable easy adjustment of the clearance 17 between the interfacing inner 9, and outer 21, parallel annular mold-wall edges.
  • Adjustment of these clearances may be effected manually using an Alien wrench applied to a hexagonal socket in the stud end of cam roller 15, whilst measuring the clearances with feeler gauges. Clearances down to the 25 micron area can be accomplished without any contact across the interface, thus emulating a continuous mold wall whilst avoiding wear and galling of these mating surfaces. At typical casting temperatures approaching the liquidus, the combined parameters of surface tension, viscosity .and transient solidification in the presence of cold, high-conductivity mold wall material, generally then preclude entry of metal between the mold-edge faces proximate the meniscus.
  • rollers 15 are also provided with flanges 22 to ride against circumferential transverse alignment guide surfaces 23, incorporated into guide tracks 5,6 to maintain transverse (side-to-side) outer mold-wall alignment.
  • Segment-mounted radially-slidable brackets, or the like may be employed to augment, or as alternatives to, the eccentric bushings 16 for adjustment of track follower position and thereby clearance 17.
  • Outer-radius mold wall 12 may be transversely contoured, for example, recessed between the edges to provide a rounded billet corner and eliminate the sharp right-angled corner at 17 characteristic of a flat plate shoe, a source of possible rolling mill difficulty.
  • the inner mold-wall support rings 3 also include a second set of annular balancing guide tracks 25 directed radially inwards, against which ride balancing cam followers 27.
  • there is one set comprising two of these rollers 27 applied to each hinged mold segment 10, each set counteracting the corresponding two sets of rollers 15, leveraged to apply approximately equal force to each set.
  • the rollers 27 are mounted on balancing slide arm 29, guided for movement in the radial direction only within support ring side bracket 30, .and stroked by balancing cylinder 31.
  • Such balancing actuators can be powered by any appropriate fluid, but compressible gases such as air have a clear advantage when in a pressure-control mode of this application, by compensating for wheel and track eccentricity and irregularity displacements without use of supplementary proportional or servo control valves or the like to meter fluids back and forth.
  • Oscillation of segment 10 along the path defined by cam rollers 15 along tracks 5,6 is effected, such as by hydraulic oscillator 32 acting between rotatable bracket 33 fixed to segment 10 and externally fixed support bracket 34.
  • a wide range of forms of hydraulic and electro-mechanical oscillators as well as casting control systems, are known in the -art of continuous casting.
  • the inner mold walls are appropnately force water-cooled with water supplied and returned via at least one set of wheel-mounted water pipes 35
  • Each segment 10 is supplied with coolant, usually water, via an inlet through box side walls 13 or outer cover wall 143 into enclosed header pipe 37 feeding coolant spray nozzles 38 which direct the coolant spray 39 to impinge on the exte ⁇ or surface of outer radius mold-wall 12.
  • Spent coolant flows by gravity through outlets 40 into approp ⁇ ate hosmg to a sump or the like, usually for recirculation Ease of coolant enclosure, as compared to flexible belt casters, is also to be noted.
  • Removable cover plates 41 incorporated mto segments 10 provide access to the sprays for maintenance and the like, as well as rotation adjustment of cam roller eccentric bushings 16 These preferably include quick-release fasteners and seals
  • Fig. 5 illustrates an embodiment adapted for casting of thin slab products. Except for the shape and size of the mold envelope, it will be seen that the basic machine features are essentially the same as those for casting billets .and blooms, as illustrated by Figs 2 and 3
  • Figs. 6 and 7 illustrate a supplementary apparatus to facilitate the castmg of various slab widths without major equipment modifications or substitutions.
  • the side faces 89 of partially solidified thin slab 61 are confined between the two movable mold side-dam bars 44, also fabricated and machined on an arc to a clearance fit between inner 8 and outer 12 mold wall faces
  • Bars 44 are confined transversely between side alignment brackets 47 of movable carnage 46, and circumferentially by the interaction between pin 50, as fixed to carnage 46 by bracket 48, and mold side-dam oscillator bracket 49
  • Carriage 46 is earned on two pairs of vee-guide rollers 53 which run on transverse guide track 51, providing linear guided movement only in the transverse direction Track 51 , in turn, is fastened to track support bracket 52 attached to segment 10, and thereby transmits the corresponding circumferential oscillation movement of the outer mold wall to mold side-dam bars 44.
  • Rollers 53 are preferably mounted on eccentric bushings
  • Carnages 46 are fixed transversely by threaded take-up nuts 59 riding on support bracket 60, variably positioned axially by rotation of opposite-hand threaded carriage drive screws 58, as driven by centrally located hydraulic traverse motor 54. As illustrated, this is a hollow-shaft motor mounted on splined drive shaft 64, as carried between flange bearings 56 of motor support bracket 55, in turn fixed to the outer wall of box enclosure 10. Torque couple-arms 66 act against torque pins 63 to prevent motor body rotation. Shaft 64, in turn, is connected at either end to drive screws 58 by couplings 57.
  • Mold side-dam bar 44 appropriately comprises a rectangular tube of copper alloy, blanked off at both ends, with coolant provided via flexible hoses connected into coolant inlet and outlet connections 45, one of which is internally piped to the bottom extremity of side-dam bar 44.
  • the faces of bar 44 may also be drilled for lubricant ducts and outlets, to provide face lubrication, such as by rapeseed oil during operation.
  • a taper can be added to the outer-radius mold walls 12 by graduating the portion of the face of outer-radius mold walls 12 within sides 18.
  • Fig. 8 shows a variation including a containment roller wheel sector 28 incorporating containment roller segments 90 which cany containment idler rollers 69, in place of outer radius mold-wall 12, with coolant sprays 39 thereby impinging directly upon the surface of the cast metal section.
  • the withdrawal forces can then be applied directly by the rollers 69 at the cross section being cast, by maintaining static frictional contact and pressure between the stock skin surface and the inner radius mold walls 8, as they move and propel the casting along at essentially identical surface speed.
  • rollers 69 may also be split into multiple lengths incorporating intermediate segment-supported bearings. It is obvious that minor leakage of spent cooling water can take place via clearances 17, in the absence of sealed contact between side walls 13 and inner mold-wall edges 9. A supplementary seal may be added to minimize this leakage (not illustrated). Suitable practice could provide on the order of a meter of wheel arc, e.g. one box enclosure 10 at the top, as illustrated, incorporating outer mold walls 12 and the two bottom segments 90 be equipped with rollers 69.
  • One or more of the containment rollers 69 may also be applied to effect thickness reduction of the cast metal section by increasing the roller pressure, optionally including liquid core reduction when the section is only partially solidified. These rollers may be undriven idlers or, alternatively, powered so as to rotate the roller surface at a rate synchronized with the surface speed of the cast metal section.
  • a starter block or starter bar is usually inserted into the mold cavity, designed to move in unison with the wheel once casting commences.
  • a starter block When the block can be confmed between the wheel rim and containment rollers, only a relatively short starter bar is required or, alternatively, a short starter block head having a longer, flexible elastomer bar attached, which can be hollow and contoured to fit snugly in the wheel groove, in order to assist with section guidance following exit from the machine.
  • the block characteristically includes a protruding top hook or claw designed to hold the starter block and freshly cast metal together in one piece until they are separated following exit.
  • FIGs. 8 and 9 illustrate means to mitigate this problem by a funnel-shaped departure on only the outer-radius mold wall at the nozzle 65, wherein wall 12 is extended vertically and tangentially upwards, as at 67, at right angles to the wheel horizontal center line 80 in the plane of rotation of the wheel, at the transverse location of submerged entry nozzle 65, on either side of which mold- wall 12 is graduated into the straight-sided cylindrical wall, in the form of a half funnel-segment 68 with maximum width at the location of molten metal entry 42.
  • the thickness of nozzle 65 is nearly equal to the casting thickness, it may be seen that adequate insertion is obtained, including good wall clearance, by vertical insertion of nozzle 65 parallel to this vertical funnel wall.
  • Fig. 10 illustrates simple means of maintaining position and controlled pressure of transverse containment rollers 69 against the outer section surface.
  • the roller shafts 71 are journalled within sealed cartridge bearings 72, riding in guided chocks 73, as recessed in the structure of side-walls 13 of segment 90.
  • the chocks 73 and thereby rollers 69 are loaded and retracted by air or hydraulic cylinders 70, through which the position or force of each roller against the cast metal section surface 104 can be adjusted.
  • Fig. 11 illustrates another means of supporting and controlling rollers 69, whereby the outer race of bearings 72, mounted on roll shaft 83, are carried within an eccentric bushing 76.
  • Rotating means for bushing 76 such as a pivotally mounted cylinder or rotary actuator (not shown) actuating lever arm 77 of the bushing, can effect both controlled pressure and controlled position of roller 69.
  • Cooling water can also be supplied via rotary union 78 through internal ducting within shaft 83 to roll water cooling annulus 79.
  • the bearings 72 can also be located outside of wall 13 in other embodiments, such as by extension of shafts 71, 83 shown in Fig. 10 or Fig. 11.
  • Fig. 12 illustrates an embodiment in which the mold envelope is in the form of a near net shape structural beam blank. It will be evident that a variety of such mold shapes and sizes can be applied as variations on die basic features of the apparatus of the invention.
  • Figs. 13 and 14 illustrate a containment roller segment variation, in conjunction with a wheel in which a spray-cooled copper block mold ring 93 comprises the wheel rim, combining the functions of inner mold wall 8 and annular outer radius mold wall edge guide track 6.
  • Cam roller track followers 15 ride directly on the mold ri , (guide track 5,6) with flanges 22 riding against bevelled edge surface 94 of mold ring 93.
  • Balancing rollers in this case may more conveniently be mounted to act between the roller segment and a fixed support attached to the machine base, backing frame or the like, rather than the rotating wheel.
  • Mold ring 93 is appropriately cooled by means of inside coolant sprays 159 and side sprays 160.
  • Roll shaft 84 is fixed, except for rotation together with externally eccentric bushings 85 keyed or otherwise fixed to shaft 84, and also concentrically supports the inner race of bearing cartridge 72 carrying roller 69 on the outer races.
  • Pneumatic or hydraulic cylinders 91 function similarly to rotary actuators by stroking eccentric lever arm 92 to control position and pressure of containment rollers 95 against the outer surface 104 of the solidifying cast metal section. This arrangement facilitates close control of the face position of roller 69 in relation to surface 104, such as by precise positioning of cylinder 91, for example, employing position sensors for the rod of a hydraulically operated cylinder, including a transducer to accomplish remote electronic automatic position control, to maintain set-point positions.
  • rollers could be directly and individually supported with reference to the machine base or backing plate only, eliminating rollers 15,22 and allowing radial roller position to follow the variations in position of casting surface 104 as the wheel rotates, cylinder 91 being operated pneumatically.
  • Lever arms 92 of adjacent rollers may also be linked together providing for actuation of two or more rollers 69 with one cylinder, but with the potential disadvantage of unequal roller pressures or stock-to-roller clearances occurring.
  • a three-position duplex cylinder or equivalent could be employed in place of single cylinder 91.
  • T is includes a pressurized water-filled inlet chamber 106 separated from outlet chamber 107 by dividing wall 108, incorporating baffle plate 109, as held in position by draw-bolts 110, to assure high-velocity water flow within annulus 111 for cooling of outer radius mold wall shoe 112.
  • Draw-bolts 110 are sealed by way of an appropriate O-ring gland 113.
  • the outer radius mold wall shoes 112 are sealed by an elastomer-coated metal gasket 130 and fastened in position by screws 131.
  • cental mold overflow channel 149 at mold entry to reduce the risk of molten metal jamming the entry junction between wheel and outer mold wall, should overflow conditions occur during casting.
  • the balancing assembly is based upon an external support frame, to locate and control the force of flanged rollers 114 against balancing track 115. Rollers 114, in turn, are mounted with clearance but captured within retention flange 116, thus providing for retracting the segments radially outward and off the wheel to hold them in essentially fixed position when desired for mold inspection, maintenance, changing of wheels and the like.
  • This segment embodiment includes substantial radial adjustment of track followers 15, in view of the much lower cost of re-machining used outer radius mold wall shoes 112 after use; in comparison with replacement with new ones.
  • Adjusting screw 122 effects adjustment of pillow blocks 121, to be held in position by locking screws 123.
  • one of the followers 15 of each opposing pair is spring-preloaded transversely by way of compression spring 124 acting between cap 125 and the face of linear bushing 126, thus maintaining continuous running contact between flanges 22 and inner mold edges 94.
  • Side-guide follower rollers, having one of each pair spring or fluid pre-loaded is a more elaborate alternative not illustrated.
  • a single universal hinge- coupling assembly 120 connects adjacent segments together, comprising opposed spherical plain thrust bearings 117, thrusting against end flanges 82 of segments 90 confmed by bolt-and-nut assembly 118 and at an adjustable distance of separation between flanges 82, and also incorporating pre-load spring 119 with spring rate force sufficient to eliminate clearances and any backlash, whilst allowing both transverse and angular misalignment between segments.
  • Belleville spring-washers are appropriately inserted between the nuts and bearings 117, designed to balance the opposing force of spring 119, and with additional travel sufficient to accommodate the expansion after start-up.
  • Fig. 17B also illustrates the variation of a contoured transverse profile of outer-radius mold wall 112, in which side faces 18 are extended past clearance 17 into a recess of outer mold wall shoe 112. This eliminates the acute angle at the .section comer entering into gap 17 and also allows a rounded comer 127 of the cast metal section. As otherwise illustrated to be flat, any metal flash into clearance 17 between shoe and wheel occurs at the section comer, rendering it difficult to hot roll or extrude without introducing lap surface defects or the like, whereby whecl-and-band casters usually mill off the comer flash prior to hot working. Contouring of the outer mold shoe face also extends the range of shapes and sizes which can be cast.
  • FIG. 19 illustrates the invention as applied to such a wheel, and with segment balancing effected by an air cylinder 145 mounted within a square tube 146, the extension of which carries the segment balancing rollers 1 14, and guided by sliding bearing pads 144 riding against the inner walls of another square tube 147 fixed to machine frame 148.
  • Oscillator crank arm 99 transmits oscillating motion to mold segments 10, as generated by oscillator drive assembly 156, which is also supported by fixed machine frame 148.
  • Figs. 20, 21 and 22 illustrate details of the segment balancing units as appropriately cantilevered out from a backing frame also supporting the main casting wheel hub and bearings. Please note that piping and wiring and the like is omitted from Figs. 15-22 for clarity.
  • Figs. 23 and 24 illustrate a suitable oscillator, in which housing 95 carries bearings 96 for rotation of drive shaft 97 by means of adjustable speed hydraulic motor 98 as an alternative to air motor 74 with gear box and belt drive 75, as illustrated in Fig. 19.
  • Eccentric crank extension 99 revolves around the center axis of shaft 97 carrying connecting rod drive bearing 105.
  • location ring 154 of cantilevered stub shaft 150 is rotated by nut 151 and locked at the desired stroke length by bolted locking plate 152.
  • Crank 99 may be connected directly to mold segment wrist pin 153.
  • a sinusoidal reciprocating oscillation of selected adjustable stroke length, is transmitted to the moid segments.
  • Figs. 25, 26, 27, 28 and 29 illustrate additional or alternative embodiments of the roller segment apparatus 90.
  • the roller eccentric assembly comprises drive eccentric disk 137 and driven eccentric disk 138 which are equally eccentric to roller shaft 84 and keyed to it by parallel cross keys 134 and 1 5, as fixed by dowels 136, thus comprising a rigid assembly to maintain parallel rotation of the shaft 84 axis about the axis of disks 137, 138.
  • Containment idler roller 69, as supported by bearings 72, is then rotatable about shaft 84 by frictional contact with the moving face of the cast metal section.
  • Concentric disks 137, 138 rotate within concentric bushings 161 mounted within axially aligned circular apertures in opposite box side walls 13, and the rotation of drive eccentric disk 137 is effected by a rotary actuator assembly.
  • this comprises a shaft 162 journalled within bearings 163 of housing 164, which is bolted to side walls 13 with axis concentric to disks 137, 138.
  • Pneumatic or hydraulic cylinder 91 via crank arm 165, rotates shaft 162, which transmits essentially pure torsion force to disk 137 by way of splined or square shaft end 166 or the like.
  • the extension stroke of cylinder 91 is limited by abutment of the roller 69 shoulders against wheel rim tracks 5,6.
  • the retraction stroke limit is adjustable by stop-screw 169, as carried on bracket 168 attached to housing 164, against pin 167 which rotates integrally with shaft 162.
  • this provides for pressure control of roller 69 against cast metal section surface 104 during stroke extension, providing for section movements, dimensional and surface irregularities whilst maintaining effectively constant roller force.
  • operating with cylinder retracted or zero extension air pressure provides for positional containment only, even allowing the cast section to release from the wheel, according to the setting of stop-screw 169.
  • the roller segment assembly 90 is adapted to provide combined air-water cooling via air manifold 139 and water manifold 140 feeding spray block 141 into air-most nozzles 142, as well as spray water only, onto rollers 69 via water nozzles 144. As shown, these segments are not enclosed, although they could be so arranged if desired. Segment-to-segment hinging and segment balancing assemblies are analogous to those of the mold segments 10, as illustrated.

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  • Continuous Casting (AREA)

Abstract

Roue à couler qui porte une paroi (8) de moulage rotative de rayon interne sur son bord et possède un secteur (11) de moulage non rotatif comportant au moins un segment de moulage (10) rigide possédant une paroi (12) de moulage de rayon externe, et oscillant de manière circonférentielle autour d'un support fixe (34) externe. Ladite roue à couler comporte sur sa périphérie des rails de guidage (5, 6) circonférentiels le long desquels des rouleaux (15) de guidage à fonction de came portant les segments non rotatifs (10) agissent pour maintenir un espace libre étroitement régulé entre les bords des parois de moulage de rayon interne (9) et de rayon externe (12) pendant toute la durée de la rotation. Le secteur de moulage (11) non rotatif peut être conçu en tant qu'ensemble unique ou en tant que segments multiples (10) fixés ensemble par charnière en vue de l'oscillation provoquée par un seul oscillateur (32), chaque segment comprenant son propre système de rouleau de guidage. Chaque paroi intérieure de caisson se dédouble pour constituer la paroi (12) externe d'enveloppe de moule, qui peut être refroidie par de l'eau pulvérisée (39) projetée par des buses (38), ou par fermeture étanche et mise sous pression de segments (10) à travers lesquels est maintenu un flux régulé de liquide de refroidissement. En raison de la construction rigide de la roue et de la fermeture, la présente invention peut également être adaptable à la coulée de planches larges pour des laminés plats, par simple augmentation de la largeur de la roue par rapport à la profondeur de l'enveloppe de moulage. Certains modes de réalisation comportent des digues (44) latérales à largeur réglable pour régler la largeur de la planche coulée, et un espace supplémentaire pour des buses d'entrée intégrées pour la coulée de planches minces. La présente invention est adaptable pour toute une série de produits sous forme de filet métallique comprenant des sections structurales. Dans un mode de réalisation, la présente invention comporte des segments (90) de rouleau non oscillants qui portent une série de cylindres non commandés (69) au lieu de la paroi (12) de moulage de rayon externe, après formation d'une peau solide cohésive sur la partie en cours de moulage. Cela élimine considérablement la friction de fermeture et assure un contact non coulissant à pression régulée entre le produit de moulage et la roue, ce qui permet la propulsion dudit produit par friction statique le long de l'arc de contact avec la roue, plutôt que par traction à l'aide de cylindre de retrait suivant l'évacuation, ou par des cylindres entraînés le long de la partie de confinement. Divers autres caractéristiques et avantages de l'appareil sont également décrits.
EP96922708A 1996-07-18 1996-07-18 Machine a couler de type a roue rotative Expired - Lifetime EP0942795B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA1996/000473 WO1998003286A1 (fr) 1995-04-10 1996-07-18 Machine a couler de type a roue rotative

Publications (2)

Publication Number Publication Date
EP0942795A1 true EP0942795A1 (fr) 1999-09-22
EP0942795B1 EP0942795B1 (fr) 2002-06-05

Family

ID=4173161

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96922708A Expired - Lifetime EP0942795B1 (fr) 1996-07-18 1996-07-18 Machine a couler de type a roue rotative

Country Status (5)

Country Link
EP (1) EP0942795B1 (fr)
JP (1) JP2000514718A (fr)
AT (1) ATE218405T1 (fr)
AU (1) AU721235B2 (fr)
DE (1) DE69621657T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108500223B (zh) * 2018-03-09 2019-10-11 张家港立志传导新材料有限公司 一种镁基材料连续铸挤设备中的增压装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1301977A (fr) * 1961-07-13 1962-08-24 Duralumin Machine de moulage continu
JPS58205660A (ja) * 1982-05-26 1983-11-30 Ishikawajima Harima Heavy Ind Co Ltd 連続鋳造装置
US5547013A (en) * 1993-03-17 1996-08-20 Sherwood; William L. Rotary wheel casting machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9803286A1 *

Also Published As

Publication number Publication date
AU6350796A (en) 1998-02-10
DE69621657T2 (de) 2003-02-06
JP2000514718A (ja) 2000-11-07
ATE218405T1 (de) 2002-06-15
AU721235B2 (en) 2000-06-29
DE69621657D1 (de) 2002-07-11
EP0942795B1 (fr) 2002-06-05

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