US3167829A

US3167829A - Apparatus for continuous casting of metal

Info

Publication number: US3167829A
Application number: US174609A
Authority: US
Inventors: Hess Walter; Colombo Enzo; Olsson Erik
Original assignee: Concast AG
Current assignee: SMS Concast AG
Priority date: 1962-02-20
Filing date: 1962-02-20
Publication date: 1965-02-02
Anticipated expiration: 1982-02-02

Description

Feb. 2, 1965 w. HESS ETAL APPARATUS FOR CONTINUOUS CASTING OF METAL 6 Sheets-Sheet 1 Filed Feb. 20, 1962 Feb. 2, 1965 w. HESS ETAL 3,167,329

APPARATUS FOR CONTINUOUS CASTING OF METAL Filed Feb. 20, 1962 6 Sheets-Sheet 2 Feb. 2, 1965 w. HESS ETAL 3,167,329

APPARATUS FOR CONTINUOUS CASTING OF METAL Filed Feb. 20, 1962 6 Sheets-Sheet 3 Fig. 5

Feb. 2, 1965 w. HESS ETAL 3,167,329

APPARATUS FOR CONTINUOUS CASTING OF METAL Filed Feb. 20, 19 62 4 e Sheets-Sheet 4 Feb. 2, 1965 w. HESS ETAL 3,167,329

APPARATUS FOR CONTINUOUS CASTING OF METAL Filed Feb. 20,- 1962 6 Sheets-Sheet 5 Fig. 7b

Feb. 2, 1965 w. HESS ETAL APPARATUS FOR CONTINUOUS CASTING OF METAL 6 Sheets-Sheet 6 Filed Feb. 20, 1962 United States Patent 3,167,829 APPARATUS FOR CONTINUOUS CASTING OF METAL Walter Hess, Dusseldorf, Germany, and Enzo Colombo and Erik Olsson, Zurich, Switzerland, assignors to Concast Ag., Zurich, Switzerland Filed Feb. 20, 1962, Ser. No. 174,609 4 Claims. (Cl. 22-572) The present invention relates to an apparatus for contlnuous casting of metal and particularly refers to a means for guiding the cast ingot or slab immediately after the latter leaves the die in the so-called secondary cooling zone.

In the continuous casting of ingots or slabs these are cooled down in the secondary cooling zone shortly after they emerge from the die by spraying water against them to such an extent that when leaving this zone the slabs or ingots are approximately solidified over their whole cross-section. In order to obtain metallurgically perfect quality of the cast slab it is of great importance that the spraying is adaptable to changing Working conditions and that this spraying, while being precisely adjustable, is also perfectly uniform. Since at least in the zone adjacent the die the solidified external zone or skin of the slab is still thin and thus may take up only limited pulling and compressing strains it has shown advisable to provide means which contact the Wall surface of the ingot or slab directly after it is withdrawn from the die for a distance which allows the walls or skin to aquire such a thickness as to continue to be self-supporting. Such means for supporting and guiding the slab as it emerges from the die and before entering the withdrawal apparatus are described and illustrated in detail in the US-patent specification No. 2,284,503 for Apparatus for Continuous Casting filed September 14, 1939. In this patent there are shown guiding rolls or plates assembled with spraying pipes in a common frame. This slab guiding or supporting means is arranged in the spray chamber in such manner that a separate roller guiding may be mounted for each slab shape or then at least the spaces between the rollers may be adjusted and that in the case of a breaking out of fluid steel through the solidified external zone or skin the slab guiding may be cleaned. Also the possibility of an easy checking, replacement or readjustment of the spray nozzles during interruptions of the working must be provided. 7

In vertical continuous casting apparatus the slab guiding means have up to now been mounted below the die in such manner that for the interchanging of this guiding means it was necessary either to remove the die in order to remove the guiding upwardly or then the guiding had to be released from its securing which was rather cumbersome and then it had to be taken out of the machine through an appropriate opening in the spray chamber. Obviously great time losses were involved with these working steps.

It is a prime object of the present invention to render' possible the exchange of the guiding means for the slab or ingot in substantially shorter time than it was possible before and thereby to notably improve the yield and the commercial efiiciency of the plant. This is obtained according to the present invention by making the guiding means for the slab or ingot and the support therefor withdrawable in direction transversally to the axis of the slab or ingot.

Other features and advantages of the invention will become apparent from the description now to follow, of preferred embodiments thereof, given by way of example only, and in which reference will be made to the accompanying drawings, in which:

FIGURE 1 is a diagrammatical view of the upper portion of a vertical continuous casting unit.

3,157,329 Patented Feb. 2, 1965 "ice FIGURE 2 is a top view on to the unit of FIGURE 1.

FIGURE 3 is a detail of FIGURE 1.

FIGURE 4 shows a slab guiding means with stationary support. 7

FIGURE 5 is a top view illustrating a slab guid ing means having a movable support.

FIGURES 6a and 6b illustrate in a diagrammatical front and side view respectively, sections of slab guiding means interconnected with each other by links.

FIGURE 70 shows the upper part of a continuous casting unit in sectional view, with the slab guiding means in form ofa set of guiding rolls in casting position.

FIGURE 7b shows the continuation of the rails shown in FIGURE 7a with a second truck carrying mounted thereon a second set of guiding rolls ready to be put in operation.

FIGURE 8 shows a truck having guiding rolls suspended therefrom only the suspension thereof being represented,

FIGURE 9 is a top view to FIGURE 8, and

FIGURE 10 is a side view to FIGURE 8. v

The continuous casting unit diagrammatically represented in FIGURES 13 is of known operation and according to conventional construction of such machines comprises a die or mould 1, a cooling or spray chamber 2 and lowering or withdrawing rolls 3 for a strand or slab A. Moreover a slab guiding truck 4 running on rails 6 and carrying a slab guiding or supporting means 5-is represented in position for casting. The slab guiding means 5 is a unit consisting of means for supporting and guiding the thin skin of the strand formed by the mold 1 and issuing from the mold and through the unit 5. The unit 5 may, thus, consist of a plurality of roller guides or a roller apron and includes cooling apparatus such as plurality of nozzles arranged in the unit to spray cooling water onto the strand as the strand passes through the unit as will be described and shown in detail hereinafter and as is shown in detail in US. Patent No. 2,234,503. The slab guiding is connected with the truck 4 through

supports

7 and 8. It may be withdrawn from the casting position represented in full lines through an opening in the wall 9 of the cooling chamber into a position 11 shown in dot-and-dash lines for checking purposes. Also from this position 11 the whole slab guiding may be removed by a crane indicated by a hook 12, while a duplicate or spare slab guiding means 13 or a slab guiding means of another type may in a very expeditious manner be brought into casting position on a further truck 14, by moving the latter through an opening in the cooling chamber wall 10 in direction to the right into the cooling chamber 2 (FIGURE 1).

In order to make possible precise adjustment of the position of the guiding means 5 with respect to the die opening 1 and to the lowering rolls 3 it is advantageous to provide, as shown in FIGURE 2, an adjusting device 20 for horizontal adjustment transversely to the direction of moving of the truck 4 and further adjusting devices 21 for vertical adjusting movements. These adjusting devices include threaded

spindles

23 and 24. The spindles 23 carry hand wheels 22 and the spindles 24 have square ends for receiving a ratchet tool, for example the one shown in FIGURE 7a, Where this tool is designated by reference numeral 85. The possibility of adjustment in direction of movement of the truck 4 may be combined with a locking device for the truck, A U-profile 25, secured to the frame of the continuous casting unit has welded thereto a nut 26 receiving a threaded spindle 28 provided with a hand wheel 27. At the side of the hand wheel 27 the spindle 28 is pivotally mounted in an eyelet of a bearing 29. This hearing may be locked by means of a locking bolt 30 over an arm 31 Welded to the truck 4. The above-mentioned adjusting means highly facilitate the truck.

- guide roll cage.

ing belly-shaped shaft ends.

3 the handling and the Operation of the unit inasmuch as the truck, which may weigh several tons, must be displaced on the rails 6 only approximately into casting position while the fine adjustment may then be effected by 1 means of the said adjusting means.

Should the construction of die oscillating means, for example the hydraulically operated cylinders 35 shown in FIGURE 3, hinder lateral withdrawal of the slab guiding truck 4 it may be possible to lower the guiding means by a lifting device, for example by means of hydraulically or pneumatically operated lifting cylinders 36, into-a position 37 'shown in dot-and-dash lines from which it may then be moved'out laterally. With the same device the slab guiding means may be lifted into the casting position afterwards.

Variations-of temperature in the ingot or slab may lead to a deflection or warping of the latter out of the desired path. Such deflection in thelower portion of the cooling chamber 2 may-result 'in a displacement of the uppermost portion of the slab guiding means 5 with respect to 'thediel' leading to undesirable'stresses of the solidified marginal zone of the slap in the thinnest part thereof and 7 even to break out. In order to prevent this according to the present invention the supports of the slab guiding means are arranged as near as possible of the. bottom of the die-and the actual guiding is suspended from the support-so that its lower free'endmay follow within its elastic'lir'nit the deflections of the slab. Such a support of the slab guiding arranged near the die is indicated diagrammatically at 38 in FIGURE 4.

If however deflections of the slab are expected that may'not'be followed by the guiding '5 without permanent deformation thereof, it maybe advantageous to replace the guiding means rigidly connected with the truck 4 as shown in FIGURE 4 by the modification shown in FIGURE 5. In the latter the guiding means is-carclanically mounted with respect to the truck, i.e. the guiding means may eifect pivotal movements to all sides with respect to the truck. In this modification the truck 4 is-provided with bearingplates 40, 41' having in their upper portions bearings 42 and 43rotatably receiving bolts 44 which in turn are rigidly connected with a' frame45. The latter carries

bearings

46 and 47 also rotatably receiving bolts 49 rigidly connected with'a further frame .48.

. The latter then carries the guiding means 5. The arrangement of the two movably arranged frames45 and 48 renders possible pivotal movements of the guiding means 5 to anyside whereby abutments (not'represented) are provided at the lower end of guiding 5 which limit such movements to a permissible extent.

If the guiding means 5 is rigidly mounted on the truck 4 permanent deformations of the guidingmeans owing todeflections of the slab may also be prevented by' dividing the guiding means 5 into at least two sections 56 as shown, by way of example, diagrammatically in FIG- URES 6a and 6b in which such sections are articulated to each other by links 55. Thereby the greatest possible number of such sections shouldadvantageously be of identical construction in order to permit interchangeability of these sections and to limit the number of spare parts to be stored.

The FIGURES 7-10 show an example of aslab guiding means in form of a roller guiding rigidly suspended from Guiding rolls'6t) are arranged-in a frame work 61 which simultaneously receives the apparatus for the-secondary cooling of the slab comprising pipes 62 and spray nozzles 63. These elements form the so-called The suspension of this cage is effected through webs-64 welded to the frame 61. Vertical adjustment ofthe cage may be effected through four annular screws 65 screwedinto boringsof the webs 64 and hav- With these shaft ends' the screws 65 are supported on slide pieces 66 thereby affording for an easily adjustable four point support of the cage. Subsequent to such vertical adjustment of the cage the w fi a s r d by nuts 6511.. The slidespieces.

-tion to horizontal continuous casting units.

are loosely placed on plates 67 welded to jacks 68. Adjustment of the guide roll cage transversally to the rail axis is effected by means of adjusting screws 69 mounted in threaded blocks 69a and engaging slide pieces 66. (FIGURE 10). A traverse 70 arranged above the webs 64 serves to rigidly mount the roll cage after the adjustment thereof onto a truck 72 by means of a pull anchor 71. The truck is provided with wheels 73 running on the rails 6. For. alignment of the roll cage in running direction of the truck 72 the latter has welded thereto a bearing eyelet in which is pivotally mounted a link 81 (FIGURE 9). The other end of said link may be connected by a locking bolt 82 with a nut 83 threaded onto a spindle 84. This spindle 84 is rotatably held in a bearing 88 fixedto an I beam 89 of-ithe machine frame and may be engaged by a ratchet 85. Thereby the nut83 may be axially displaced and the truck 72 moved. After such adjustment of the truck the latter may be clamped to the rail axis by means of four clamping devices 90.

Should an exchange of the guide roll cage be necessary the connections of the cooling water pipes must be released, the'locking bolt 82 must be pulled out of its bearing and the clamping devices 90 must, be released. Subsequent to these operations thetruck with the roll cage which just was in operation may be withdrawn and another truck with another cagemay be moved into casting position. The adjustment of the new truck in the casting position is effected as described for the first truck.

Of course the invention is not limited to the embodiment represented and described, hereinbefor'e. Several .modifications may be possible, for-example the arrange 'ment of the slab guiding sets on a turntable, without departing from the essence of the invention.

Also in plural slab plants it may be desirable for economic reasons and more particularly when similar profilesare cast to arrangeseveral slab guiding means on one and the same truck. Thereby each slab guiding means may be provided with separate adjusting devices.

In the described embodiments the roll guiding means are mounted on trucks. in order to be easily withdrawable. However it is of course also possible to'arrange the wheels directly at the roll guiding meansand to dispense with any truck.

By an appropriate bearing of the guiding means it is also possible to apply the'principle' of the present inven- Thereby the guiding means is preferably made removable from the slab in horizontal direction and perpendicularlyv to the slab axis.

Owing to the possibility of withdrawing the slab guiding means and of a rapid and precise adjustment thereof in casting position as provided by the present'invention it is possibleto improve the efliciency of any plant.

'We claim:

1. Apparatusfor use in a continuous casting plant having a continuous casting mold to solidifyvthe surface of molten materialpoured therein into a strand issuing therefrom and drawn therefromby lowering rolls which comprise guiding means positioned between said mold and said rolls and adjacent said mold to receive :the strand issuing from said mold and t-oguide and suppont the surface of said strand as it leaves the mold, cooling means for cooling said strand as the strand passes through and is supported by said guilding means, said guiding means and said cooling means being assembled as a unit on a common frame,

[H 3 ment in a direction transverse both to the axis of said strand and to the direction of said rails to precisely adjust the alignment of said unit With respect to said mold.

2. Apparatus for use in a continuous casting plant having a continuous casting mold to solidify the surface of molten material poured therein into a strand issuing therefrom and drawn therefrom by lowering rolls which comprise guiding means positioned between said mold and said rolls and adjacent said mold to receive the strand issuing from said mold and to guide and support the surface of said strand as it leaves the mold, cooling means for cooling said strand as the strand passes through and is supponted by said guiding means, said guiding means and said cooling means being assembled as a unit on a common frame, means for moving said common frame including said guiding and cooling means transversely to the longitudinal ElXlS of the issuing strand to a position giving access to said unit, and rails extending transversely of the longitudinal axis of said issuing strand, a truck mounted on said rails and being movable thereover, said unit being supportably coupled to said truck, and means for precisely adjusting the alignment of said unit with respect to said mold which comprises mean for adjusting the position of said truck along said rails and means for adjusting the unit with respect to said truck in a direction transverse both to the axis of said strand and to the direction of said rails,

3. Apparatus for use in a continuous casting plant having a continuous casting mold to solidify the surface of molten material poured therein into a strand issuing therefrom and drawn therefrom by lowering rolls which comprise guiding means positioned between said mold and said rolls and adjacent said mold to receive the strand issuing from said mold and to guide and support the surface of said strand as it leaves the mold, cooling means for cooling said strand as the strand passes through and is supported by said guiding means, said guiding means and said cooling means being assembled as a unit on a common frame, means for moving said common frame including said guiding and cooling means transversely to the longitudinal axis of the issuing strand to a position giving access to said unit, and means for moving said unit in a direction of the longitudinal axis of said strand thereby to enable positioning of said unit in close proximity to said mold during strand casting and to lower said unit away from said mold when it is desired to move said uni-t transversely.

4. Apparatus for use in a continuous casting plant having a continuous casting mold to solidify the surface of molten material poured therein into a strand issuing therefrom and drawn therefrom by lowering rolls which comprise guiding means positioned between said mold and said rolls and adjacent said mold to receive the strand issuing from said mold and to guide and support the surface of said strand as it leaves the mold, cooling means for cooling said strand as the strand passes through and is supported by said guiding means, said guiding means and said cooling means being assembled as a unit on a common frame, means for moving said common frame including said guiding and cooling means transversely to the longitudinal axis of the issuing strand to a position giving access to said unit, being coupled to said moving means at a position close to said mold thereby to ensure alignment of said unit and said mold so that said unit can receive said strand even during deflection of the guiding means by distortion of said issuing strand passing therethrough,

References (Zited by the Examiner UNITED STATES PATENTS 2,284,503 5/42 Williams 2257.2 2,601,615 6/52 Jordan 22-572 2,775,008 12/56 Easton et a1. 2257.2 2,789,328 4/ 57 Ackerman et al 22-572 2,946,100 7/ 60 Baier et al. 22-200.l 3,015,862 1/62 Bustemeyer et a1 22-200.1

MICHAEL V. BRINDISI, Primary Examiner.

ROBERT F. WHITE, Examiner.

Claims

1. APPARATUS FOR USE IN A CONTINUOUS PLANT HAVING A CONTINUOUS CASTING MOLD TO SOLIDIFY THE SURFACE OF MOLTEN MATERIAL POURED THEREIN INTO A STRAND ISSUING THEREFROM AND DRAWN THEREFROM BY LOWERING SAID MOLD AND SAID PRISE GUIDING MEANS POSITIONED BETWEEN SAID MOLD AND SAID ROLLS AND ADJACENT SAID MOLD TO RECEIVE THE STRAND ISSUING FROM SAID MOLD AND TO GUIDE AND SUPPORT THE SURFACE OF SAID STRAND AS IT LEAVES THE MOLD, COOLING MEANS FOR COOLING SAID STRAND AS THE STRAND PASSES THROUGH AND IS SUPPORTED BY SAID GUILDING MEANS, SAID GUIDING MEANS AND SAID COOLING MEANS BEING ASSEMBLED AS A UNIT ON A COMMON FRAME, MEANS FOR MOVING SAID COMMON FRAME INCLUDING SAID GUIDING AND COOLING MEANS TRANSVERSELY TO THE LONGITUDINAL AXIS OF THE ISSUING STRAND TO A POSITION GIVING ACCESS TO SAID UNIT, AND MEANS FOR PRECISELY ADJUSTING THE ALIGNMENT OF SAID UNIT WITH RESPECT TO SAID MOLD, SAID LAST NAMED MEANS COMPRISING RAILS EXTENDING TRANSVERSELY OF THE LONGITUDINAL AXIS OF SAID ISSUING STRAND, A TRUCK BEING MOUNTED ON SAID RAILS AND MOVABLE THEREOVER, SAID UNIT BEING SUPPORTABLY COUPLED TO SAID TRUCK, AND MEANS FOR ADJUSTING SAID UNIT BY MOVEMENT IN THE DIRECTION OF SAID RAILS, AND BY MOVEMENT IN A DIRECTION TRANSVERSE BOTH TO THE AXIS OF SAID STRAND AND TO THE DIRECTION OF SAID RAILS TO PRECISELY ADJUST THE ALIGNMENT OF SAID UNIT WITH RESPECT TO SAID MOLD.