DE1558178A1 - Method and device for continuous casting - Google Patents

Description

PATENT ADVOCATE.

DIPl.-PHYS. DRVVAITER LAMGHOFF 1558178

WUiohan. <At8. May 1967

1) e 3 ch r e 1 exercise on the patent application of Pinna E, VL BliöB Coinpanäf, 217 Second Strtsefc, üant; on, OliLo, USA

concerning
Process and device for continuous casting

Priority: -9. Mal 1966 - U.S.A.

The connection also relates to a method and a device Äuns continuous casting τοπ profile parts, approximately in cross section round, rectangular, oval or square-shaped Parts that are referred to below as castings.

Continuous casting takes place in a vertical through-casting mold, which is either fixed or movable to and fro and is usually cooled with water * When the Gußabüok from which the QIeSfora emerges, it is merely solidified and usually still contains a liquid core

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from ijöi-räohr-Li ^ hiir Ύΐπίν. uribwr of the solid outer skin. It is therefore also necessary to set up the casting mold at a considerable height so that it can be seen ; "! lying subsequent cooling, usually by means of what j er jt" r ah.lon, can be carried out in order to solidify the casting through and through. In order to reduce the height of the Sfcranggleßanlage, the casting strand is usually curved from the vertical position bogenfftrnU, * and then brought into a hay L / .onlvfi.i .. »Luge before it is in the specified Strand length is ab ^ ijuniiLtten. D1.3 Casting speed, the size of the (Ji6 /? 'F> t, i · -.ng.'t ,, the metallurgically glossy eggshaft on the metal and other · valley · dead effects, however, the admissible Oe-charge limit of the secondary cooling and limit to a large extent the reduction of the height of the continuous casting, due to the fact v that the Gleßstrang, the deep still a liquid core;.. üLot, along a longer vertical path must be performed b.vor DLJ complete solidification is reached and before.:. At lt; m pulling off and bending can be started.

Bieher close the pulling and bending of the cast strand with a ReLh-: rolling that close; ^ n the point of complete solidification dye strand were placed, attempts to reduce Qießhöhe characterized in that the rollers were ga.ltgt closer to the mold, were generally unsatisfactory, in · - tar line due to the fact d. _t £ strong drawing and Ii "o ^ skräftö ingsß GleßBtr-on the still soft and weak skin exerted by the zyllndrlschsn Walaen; hti single · !!? rjiilir hohan touch pressure on a small one

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'' create a strip-like surface of the skin of the cord, which often leads to internal and surface cracks. This causes errors in cast strands that have a very high specific pressure of the cylindrical peeling and bending rolls is a major problem in use such rolls in continuous casting machines.

Another problem encountered with using bend and pull rolls when they are in place or below of the place of complete solidification of the strand are arranged, is that the stretch walls then on must be a point where the cast strand is significantly is below its solidification temperature, so that higher stretching forces are required, whereby surface ruptures can easily occur again in the cast strand «

In addition, the distance between the casting mold and the bending and drawing rollers determines the length of the starting mechanism required. The starting mechanism usually forms a long, chain-like device with a rod arranged at one end, which is pushed up into the mold by the drawing rollers at the start of a pouring flow and which is originally used to form the bottom in the casting mold and pulling the cast strand with it. As a result «Ines longer The starting mechanism also requires a more expensive and more difficult-to-use storage device.

These disadvantages are according to the invention by a method and

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solved a device in which a distributed pulling and bending force acts on a relatively large surface of the Gießstranpea continuously, ao that the peeling and casting can take place closer to the mold , where the casting strand still has a substantially liquid core.

According to the invention , a pulling and bending device travels continuously with the cast strand and delimits a curved path through which the cast strand is bent, a contact member being provided which contacts a relatively large surface of the cast strand with respect to its cross-sectional area, so that a fairly low pressure is exerted on the partially solidified cast cord.

The pulling and bending device comprises at least two endless conveying devices between which the GIMT rang passes, each conveying device carrying a contact member, each of which has a common center of curvature (radius point).

According to a further development of the invention, a continuous casting process is provided in which the casting strand is cooled when it exits the casting mold in order to form a solid structure of sufficient strength that can withstand a predetermined Fitchen pressure, and the casting strand is then pulled off the casting mold and is bent at the same time along a curved line, namely by continuously applying a pulling and pulling force

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Bending force that moves sioh with the casting strand and over a attacks relatively large surface area of the skin of the cast strand.

According to a further development, the GleSetrang © ine Secondary cooling carried out in two stages, with the Oießstrang between the mold and the attack in the first stage Pulling and bending force is cooled for a long enough time to allow a While forming skin on the ossicular cord of a certain thickness the second stage comprises spray cooling to completely solidify the cast strand before it is straightened again will.

Since the launch mechanism includes both the straight and the must go through curved paths, it is made up of a number Composed rolls, the diameter of which is equal to the minimum Thickness of the strand to be produced is.

With the method and the device according to the invention, the height of the glass strand in continuous casting plants drastically reduce the pressure exerted by the pulling device and the bending orphans, so that the pressure exerted by an excessive Print errors that would otherwise occur will no longer occur. This also allows the total height of a rod caster significantly reduce and let the same calibrate in already accommodate existing factories.

The application of pulling and bending forces for the OieÄctrang

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at one point closer ar. The mold reduces the vertical height required for cooling and the distance between the mold and the drawing and bending device, so that a novel and shorter starting mechanism can be used, thereby reducing the size of the handling and storage device.

Because the drawing and bending device can never be moved closer to the casting mold, the casting strand is bent while its temperature is still above or near the point of complete solidification , so that the stretching mechanism can be brought closer to the casting mold namely to a point where the cast strand has already solidified, but has a higher temperature, so that the forces required for stretching are less binding and therefore less forces act on the casting strand.

The invention is described in the following with the aid of eohematic drawings of an exemplary embodiment.

Figure 1 is a rare view of a continuous caster

with a pulling and bending device according to the invention.

Figure 2 let a partial sectional view of the drawing and bending

mechaniamus.

Figure 3 is a Sehnittaneloht length of line 3-3 of Figure 2 and Figure Ί is a horizontal line length de? Line ¹ J- ¹ I of Figure 2.

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1 is a tranr; cooling system ίο with a water-cooled flow forra Ί2, which is mounted on a pouring floor 1 '' and is above a cooling chamber 16. Furthermore, a Zj.sh- and bending device 17, a cooling chamber 18 and a Walsen stretching device 20 are provided in FIG. The starter mechanism 22 is shown in two essential positions, firstly in a position in which the rod 2? at the beginning of a casting process in the mold, and · * where it en β in a position in which the rod rests in a handle and storage device 2 * 1 after the casting tube. I has been tightened and the continuous caster is working continuously. The starting mechanism 22 includes a view! "W * la cn R, which have the same diameter as the minimum thickness of the cast strand I and which are connected to one another by at least two links I .. Bind, which lie on both sides of the orphans and whose width is smaller than the diameter of the rolls R During continuous operation of the plant, pouring ladles 26 are moved back and forth on rails 25, with a pouring ladle being shown in its pouring position over a "Gießtrichtex-27. The flow of the molten metal from the pouring ladle" 26 into the casting mold 12 is in itself Known white regulated by the Schlftelnrichtung of the pouring funnel 27 according to a predetermined pouring speed.

The StT> ex.iggießanlage 10 has a two-stage secondary cooling device on, wherein the first stage comprises a cooling chamber and the second stage mainly a cooling chamber 18,

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however, it can also comprise an injection cooling device within the drawing and bending device 17. The initial cooling takes place within the casting mold 12 by circulating water in the walls of the same. The cooling arrangement is characterized in that the cooling chamber 16 has a significantly smaller size than known cooling devices, since the purpose of the cooling chamber 16 is not to completely solidify the cast strand I, but only a skin I ¹ (Figure 2) of a sufficient to form a thickness greater than that produced in the casting mold 12 in order to absorb the drawing and bending forces of the drawing and bending device 17, as will be explained in more detail below. The cooling chamber 16 forming the first cooling stage is essentially of the same design as the cooling chamber 18 forming the second cooling stage, and both cooling chambers comprise support rollers 23, 29 for guiding the casting strand Ϊ. Furthermore, water nozzles 30, 31 are provided which are connected to an electrical water circulation system and a heat exchanger (not shown) and are arranged between the rollers 28, 2-9. The second cooling chamber 18 comprises a sliding door 33 which is of such a size that it is attached to the pivoting arm 35 of the start chain store and the handling mechanism

24 is adapted. The length of the starting chain 22 is approximately greater than the distance between the center of the mold and the center of the pulling and bending device 17 or than the distance between the latter and the drive gearwheel 36. During the continuous casting, the pivot arm 35 remains in his

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The position shown in FIG. 1 outside the cooling chamber 18 At the start of a casting process, however, the guide door is 33 opened and the swivel arm 35 is shown in dashed lines in FIG brought position shown, namely by means of actuation cylinders 38. The start chain 22 is in the direction of onto the casting mold 12 and away from it by means of the drive gear 36 and the pulling and bending device 17 along Moved longitudinal guides 39, which are arranged on both sides of the path of the cast strand.

According to the figures 2 to ¹ I, the drawing and bending device is housed in a spray box ho, in which water jets (not shown) if necessary, be directed to the "u cooling parts" It 1st a frame 4l is provided with a pair of endless conveyors 42, $ 3 on both sides of the cast strand I, each conveyor device being driven continuously with the cast strand so that there is no relative movement between these parts. The conveying devices 42, ^ 3 have essentially the same components, which are also provided with the same reference numerals. Only the components with a different design are marked with © in apostrophes. Each conveyor * ä2 _s J | 3 is formed of a Ansahl chain links 44, which © are interconnected by means of connecting pins 46, weleh © jewsils in its center ein® role H7 and at its two Snäen H © ll @ n § 9 aufu @ l0 @n _o Di © include the upper and lower drive © 50 _D 52 of the conveyors

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axially spaced gears, which engage the rollers and the conveyors 42, drive 43, each of which is provided with a separate but synchronized drive 53rd The conveyor devices 42, 43 comprise a pulling area 54, 54 ' on which the middle rollers 47 of each pressure shoe 45, 45' run. The train area

54 is convexly curved and acts Susanne with a concavely curved area a of the tension area 54 'and delimits a circle segment with a radius R, the length of the segment depending on the cross-sectional area de Qie & strmnges I and the type of steel to be cast in large Dimensions depends. In general, the radius R is approximately equal to 25 times the thickness of the cast strand I. The upper region b of the tensile region 54 * , which extends vertically over the tensile region, has a flat surface which serves to absorb the bending forces when the Cast strand I runs into the curled web. The forces involved in bending the same are therefore transmitted directly to the frame 40, so that the entire mechanism can be easily constructed.

The traction segment 54 'and the upper and lower gears 50, 52 of the conveyor 43 are fixedly attached to the frame 4o , while the traction area 54 and the gears

50, 52 of the conveyor 42 are suspended from a joint 58 and a fork (60) which carries the upper gear shaft (42). According to FIG. 4, the upper end of the pulling area 54 is held by a shaft 62, while the lower end

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End is held by the shaft 63 of the lower drive gear in a similar manner. The upper and lower eyelets (65 and 66) are also mounted on the upper and lower gear shafts (62 and 63) and rest on holding cylinders 68, 69, which create the distance between the drawable areas 5 * »5Ί ¹ generate the necessary pulling and bending forces that are applied by the shoes $ 5 »$ 5 '. If a change in the dimension of the casting strand is required, the nuts 70 on the holding cylinders 68, 69 can be adjusted so that the distance between the pressure shoes 45, 5 'is in accordance with the thickness of the casting strand to be produced. The Drucksehuhe h _t $ t5 "are curved and convex bsw. concave in adaptation to the curvature, which is to be wiung out in its path through the drawing areas 5 * V 5 & ¹ . Since dl · Pressure shoes * l5, ^ 5 ^ during d®p Be ührang with <ä "m CSießstrang hei® will have two cooling tank 73 provided _B lead the running water, and are arranged so that -the Drujskschuhe *> 5, ^ 5 'pass through the water with each = revolution with the FCrd, $ r # inrlohtungen 42, 43 *. The Xaseerepruh-;. ', Box-ko' mnfafit a Vaeeerabdichtung 75 üb lower end emerges at de "the casting Trang I to eaoseln to the cooling water.

As already mentioned, occurs with the known continuous casting systems Because of the transfer of the pulling and bending forces to the GIEA-etrang oldtels cylindrical orphans, there is a substantial linear contact with the Gießstrang, whereby extrea hefo «

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Pressures are caused. This disadvantage does not occur with the device described.

Particularly in those cases in which the cast strand has a deeper, more fluid shape, as is usually the case with the casting of steel, the pulling and bending device 17 results in a continuous transmission of the bending and pulling force to a relatively large surface of the cast strand, causing distortions and cracking of the same are avoided and the mechanism can be placed closer to the casting mold on a cleat, where the casting strand is only partially solidified, as shown in Figure 2 1st. Oeaiß the invention, it is necessary only that the one-QleAstrang / este outer skin I ¹ of such a thickness has DAFL sio resists the distributed forces. These attack the surface of the Gießetrangta, which is essentially a function of the cross-section '. area 1st. For casting strands old a very large cross-section, the conveying devices 12, 3 are therefore much longer and the radius of curvature R is much larger, so that the bending forces are less concentrated. As an old rule of thumb, the radius of curvature R should be about 25 times the thickness of the cast strand I.

The pressure shoe that transmits the pulling and bending forces « * 5> ^ 5 'move with the casting strand during this is deformed. In the known continuous casting plants, however, when the cast strand is drawn by rolling, it is unfavorable dynamic rolling stresses generated.

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Claims (8)

PATENT CLAIMS 1. Continuous caster with a flow-through mold for casting a cast strand, characterized by Conveyors (42, 43) attached to the surfaces of the Attack cast strand and can move continuously with it along a curved path, and the original Deflect the direction of movement of the Qießstrangea out of the mold (12) along the curved path, and through Large-area contact devices on the conveyors to control the pulling and bending forces over a large area to distribute. 2. Continuous caster according to claim 1, characterized in that the conveying devices each comprise a pair of drawing areas (5 ¹ I, 5 * »'), one of which is concave and the other is convex and which are arranged opposite one another, and one is curved Limit the path for the passage of the cast strand that a number of gripping members ( ¹ IS, ¹ IS ¹ ') are provided, which are adaptable to the curvature of the drawing areas (S ^, 54') and engage the cast strand and engage with them along each drawing area (S ¹ J * 54 ') move with the pulling speed of the cast strand, so that there is no relative movement between the gripping members (45, 45') and the ßisßstrang., And that holding elements (62, 63) WHEEL 009812/0680 - Ill - are provided, which the drawing areas against a movement from a certain, adapted to the thickness of the Oießstranges Maintain the distance so that the cast strand is deflected from its original path and withdrawn from the mold. 3. Continuous casting plant according to claim 1 or 2, characterized in that the radius of the curved path is chosen in the size of 25 times the thickness of the cast strand. ή. Continuous casting plant according to claim 2 or 3, characterized in that the concave drawing area (5 ^ ¹ ) has a flat area b which extends upwards and which absorbs the bending forces. 5. Continuous casting plant according to claim 4, characterized in that the holding elements (62, 63) are held by actuating cylinders (65t 66) which change the distance allow it between the drawing areas in adaptation to different cast strand thicknesses. 6. Continuous casting plant according to claim 2 to 5, characterized by conveying devices with a number Chain links (ήΌ, where adjacent chain links each connected to one another by a gripping member (^ 5, ^ 5 ') are, with a pair of vertically spaced gears (50, 52) which mesh with the chain links can and these as well as the gripping members around the pulling areas 009812/0680 can lead, and with a drive (53) for driving the Conveyors synchronous with the drawing speed dee Gießstrangeε. 7. Cast strand system according to claim 1 to 6, characterized in that a starting mechanism (22) is provided with a number of rollers (R), the diameter of which is at most equal to the minimum thickness of the cast strand to be cast, and with a number of connecting links (L), which connect the individual roles like a chain. 8. Continuous casting process, characterized in that a casting strand emerging from a flow casting mold is cooled until it forms a solid outer skin of sufficient thickness to withstand a certain pressure, and that the Casting strand withdrawn from the casting mold and at the same time along one curved path is bent by a bending force acting on both sides of the cast strand in one with the Cast strand is applied across a surface of the cast strand which is proportional to its cross-sectional area, 9 «gekennzeichn method nauh claim 8j> et characterized _s that the cast strand directly beneath the Durchflußgieß" form is cooled only limited so that the cast strand verhältnisiiiä a!. 'Igt.1.ef s. liquid core on most, which extends into the .Bex ^s #xvh, where the pulling and bending force is applied BATH 0R5G1NAL 009812/06 80 -Ιβ- ΙΟ. Method according to Anopruch 9 »characterized in that that the cast strand is cooled extensively at one point which is mainly concentrated under the area where the pulling and bending force is applied, bo that the casting strand is completely solidified. 0 0 9 8 12/0680 Blank page