DE2438280A1 - PULLING ROLLER DRIVE FOR A CONTINUOUS CASTING DEVICE - Google Patents

Description

PATENT LAWYERS

MANITZ, FINSTERWALD & GRÄMKOW

_v 8, & ug. OT

G 3050

GENERAL MOTORS CORPORATION
Detroit, Michigan, USA

Peel roll drive for a continuous casting device

The invention relates to a pull-off roller drive for a continuous casting device, wherein a cast ingot is intermittently pulled forward , and where a roller serving to remove the ingot, which is arranged at a distance from the casting mold , is in one

509811/0709

DR. C. MANITZ DIPL.-ING. M. FINSTERWALD DIP L. -ING. W. GR AMKOW ZENTRALKASSE BAYER. FOLK BANKS

β MÖNCHEN 22. ROBERT-KOCH-STRASSE 1 7 STUTTGART SO (BAD CANNSTATTI MÖNCHEN. ACCOUNT NUMBER 7270

TEL. (0691 22 42 11. TELEX OS - 29-672 PATMF SEELBERGSTR.23 / 2S. TEL. (0711) 56 7261 POSTSCHECK-. MÖNCHEN 77Ο62-βΟ5

a predetermined amount is moved in the opposite direction, this movement starting at the point in time at which the standstill period begins.

In one form of such a continuous casting process, molten ferrous metal is poured from a holding vessel into a mold. The cylindrical walls of the mold are cooled so that the molten metal solidifies if it can come to a standstill against them4 thereby forming a new, initially separate section of ingot with a solidified, annular, rear end face and cylindrical shell during each standstill period . The net heat transfer from and to the annular surface of the mold located downstream, seen in the flow direction, is such that the solidification of the metal takes place up to a radius which is between the most inner area of the annular surface and the outer circumference s « ill «> exposed area. This is no longer liquid, solidified metal is displayed in bar form by a suitable outlet channel from the mold, üe the necessary withdrawal or the withdrawal of the billet iu care, can one serving for the withdrawal of the billet roll "it de" bullion at a point

5098 11/0709

engaged at a distance from the exit point of the Barrens is arranged. This roller is used in a series of intermittent, short, to withdraw the billet Serving rotational movements rotated by significantly longer periods of standstill of the ingot from each other are separated. For example, the rotations can move the ingot a distance of approximately 1.9 a (three quarters of an inch) move forward and occur, for example, at a repetition rate of about 120 prints per minute. The rate of withdrawal of the billet during each of these movements is faster than the rate of solidification of the molten metal when it is after flows forward and radially outward against the cylindrical walls of the mold. So while the bar is being withdrawn and the molten metal behind it solidifies to form a new section of the ingot that becomes the new one Section separated from the pre-formed billet by an area of non-solidified metal. That the Molten metal forming the new ingot section first solidifies at the rear end of the part, the will form the new billet section, with further solidification towards the leading end of that section he follows. So the solidification runs in the same direction as the movement with which the Ingot removed from mold during its withdrawal periods

50981 1/0709

will. At the point in time at which the downtime of the ingot ends, the front end of the new section is welded together with the withdrawn, rear, annular end surface of the previously cast section, so that during the new withdrawal movement (the one over the pull from the one at a distance arranged roller is transferred) the newly solidified portion is pulled forward to form the rear end of the solidified billet, whereby one cycle is completed .

The fiery withdrawal roller should be some distance, such as 8 to 10 feet or more, from the end of the billet against which the new metal will be welded during the downtime or froze. It has been found that it is necessary to exert a slight reverse motion during the standstill period on the rollers used to withdraw the billet. Otherwise, the weld between the annular surface of the trailing end of the drawn billet and the leading end of the newly solidified portion of the billet will tend to break. However, this is disadvantageous and occasionally even very dangerous, since it requires at least an interruption of production and thus results in a time-consuming restart of operation;

50981 1/0709

2A38280

in extreme cases it can even lead to liquid Metal can freely leak through the mold and splash onto the floor. This reverse movement only has a small size. For example, it can be on the order of 0.635 mm (1/10 inch). Experience with continuous casting have shown that such a device is initially with some reliability can work, but after a long period of operation the casting is irregular with regard to the breakage of the ingot and leads to unsatisfactory results. Although the reason for these poor results is not complete is known, it is assumed that it is due to otherwise imperceptible wear in the drive device which is zvygering to be in any other Relationship to matter. In any case, it turned out that this difficulty caused by the device described herein according to the present invention is overcome which causes the roller biased by springs in the reverse direction for a predetermined amount of reverse rotation will {this movement begins at the moment when the movement of the take-off roller starts with the an ingot is removed, is stopped »

It is therefore an object of the invention, inter alia, to provide an improved, continuously operating casting device to create with an immitting bar withdrawal,

509811/0709

in the case of one of the rollers used for drawing off the barrel, which is arranged at a distance from the solidification point of the metal is, immediately of a retracting force on the ingot, which is reversed during a predetermined one Rotation of the roller is effective ", is subjected when it is at the end of the movement serving to withdraw the billet comes to a standstill.

By the present invention this effect is achieved in a manner which enables an easy adjustment, both in terms of the size of the force exerted on the billet reverse force and with respect to the amount of reverse movement, on the like is applied; Furthermore, this effect takes place in such a way that the operation of the device can be observed visually. Furthermore, this effect is achieved independently of play and wear and changes in play and wear on the cams and other drive parts.

The new features characteristic of the present invention are listed in particular in the claims that are summarized at the end. Both the structure and the operation of the invention itself, however, are best understood from the description which follows, in which. Reference is made to the accompanying schematic drawings.

509811/0709

E.s ;; cigon:

FIG. 1 is a general, somewhat schematic view with Tc'ilcn in axial cross-section of a complete, continuous casting apparatus of the type to which the present invention can be applied; the state of this device is shown at the end of the movement leading to the withdrawal of the ingot;

FIG. 1 a is a fragmentary view similar to FIG. 1, but with the state of the device at the end the standstill period is shown;

Figures 2 and 3 are a perspective view and an axial cross-section, respectively, of the preferred mechanism for the transmission of intermittent movements for the billet withdrawal as well as the downtime to the roller drive swell e;

Figure Ί an elevation of the drive roller for the trigger of the bar and associated mechanisms;

Figure 5 is a side view of the device of Figure k , taken along the axis of the drive roller, the parts being shown in their positions at the end of the idle period; and

ORIGINAL BATHROOM 509811/0709

Figure 5a is a fragmentary similar to Figure 5 View but showing the parts in the positions they will be in at the end of the ingot withdrawal period to have.

In Fig. 1, a holding container, in particular a holding furnace, for the molten metal is shown at 10, which, in use, contains a certain amount of the molten ferrous metal M that can be cast. This The container is attached to the molding unit generally indicated at 12 in such a way that a sealed connection is created. This unit has a passage 12 a serving as an inlet, which ends in a spout 12 b made of boron nitride, which penetrates into the path of the molten metal and forms an annular end surface 12 d which against the direct metal flow is protected. The shape has a cylindrical portion 12 c, which is through a not shown Device is cooled or quenched. The heat flow to and from the seen in the direction of flow downward facing surface of the exposed boron nitride spout is such that the molten metal solidified, it being at the junction of the outer, annular surface 12 d made of boron nitride and the cylindrical , Inner surface 12 c of the mold begins to progressively have a sleeve-like section 13 to form an annular rear surface. The cast ingot or block is indicated in FIG. 1 at l'i.

509811/0709

As shown at lk d, the billet lk is solidified at its rearward end towards the completion of an operation leading to the removal of the billet to a generally annular end surface and a generally conical interior, the annular end surface having a radius between that of the radially inwardly directed surface of the spout made of boron nitride and its outer, exposed radius. A gap lk d occurs between the end face and the newly cast section 13, which gap consists of liquid, or essentially liquid, metal. In Fig. 1, the bar 1A is shown just after a movement to remove the bar and at the point in time at which the short, regular standstill, also referred to as the holding time, begins. As shown in Fig. 1 a, the gap lk d welds together until the end of the following holding period, so that with the next withdrawal movement the ingot is connected to the newly cast section and is pulled forward together with it.

At a point spaced a certain distance from the end of the mold 12, the billet I ^ is passed between a drive roll l6 and a pinch or finish roll l8. The caliber pressure or roller attack of these rollers ensures that the drive roller l6 and the ingot lk reliably come into engagement with one another; thereby the ingot takes on the movement of the roller

509811/0709

part. As described further below, the Roller l6 driven in a sequence of rotary movements which serve to remove or withdraw the beard. Every this rotational movement transmits a rapid trigger or forward movement of approximately 1.8 era (three quarters Inches) on the bars. The roller then stands for a period of time that is approximately equal to the time in which the ingot is withdrawn, still (with the exception of the reverse movement to be described below ). Because of the successive movements of the billet, a series of dimensional markings l4b occurs as Ring around the bar at intervals equal to the size of the successive bar that is used to withdraw the bar Movements are.

In operation, the apparatus shown in Fig. 1 moves gradually dan bars in predetermined steps, such as 1.8 cm (three quarters inch) from j after which time solidified portion of the molten metal which fills the left portion of the F _orni, on the peeled end l4 a of the ingot. The forward movement is transmitted to the ingot l ^l k by the drive roller 16 so that the quenched end 12 c of the ingot is pulled away from the spout 12 d at a higher rate than the molten metal solidifies. Therefore, there is molten metal on or near the rear end face of the billet. Will be the back end of the ingot

509811 / D709

withdrawn, so that molten metal fills the space behind the kiln, so the molten metal solidifies against the annular surface 12 d of the spout 12 b and against the cooled cylindrical surface 12 c of the mold 12. This process proceeds progressively, starting at the end of the spout 12 b and further with a movement in the forward direction of the movement of the ingot. The rate of billet withdrawal, however, exceeds the rate * at which the molten metal solidifies so that, as shown at lk d in Figure 1, molten metal is in contact with or near the end face l'la of the billet. During the subsequent holding period, the molten metal solidifies against the rear end face of the ingot, so that at the point in time at which the next withdrawal movement of the ingot takes place | A new sleeve of solid metal extends from the previous end of the billet to the annular surface on the spout 12d and has sufficient strength to support the re-solidified portion when the billet is withdrawn in the next step. During the subsequent withdrawal movement of the billet, the new billet section formed by this sleeve and the remainder of the billet are carried as a whole, thereby completing an operating cycle.

ORIGINAL BATHROOM 509811/0709

It has been found that the weld between the banks 1 (t, as it occurs at the end of each trigger movement, and the newly solidified section, when this process is carried out, leads to great difficulties if it is not optimally designed in a suitable manner. it is the area that is indicated b in Fig. 1 a general at 1%. If the weld is not efficiently produced, so the solid ingot tends during the next following withdrawal movement dos ingot at this point of the to separate ^ solidified section · Is the

Welding point not designed in a corresponding way,

and becomes the deduction claim of the ingot continued, it is possible for molten metal to spill out from the mold to the floor of the casting hall.

It is believed that the difficulty in forming an effective weld is due to the thermal contraction of the bar 14 as it cools. This means the following: if the roller 16 is stationary and the billet cools down, the end l4a is pulled off somewhat from the mold 12 , whereby the welding of the newly blown section to the end of the billet previously produced is prevented or disturbed. In any case , it has been found that a slight reverse movement of the roller 16

50981 1/0709

BAD OHiGiNAL

can avoid the ingot at the point of new Weld breaks. The initial attempts at creating such a reverse motion resulted but lead to irregular and unpredictable results, especially after a long period of operation. It is believed that this is deficient Reliability is due to very little wear and tear on the parts of the drive mechanism; at all This wear cannot be determined in normal applications. In any case, avoid the following to be described improved device this difficulty, so that continuous pouring over a longer period is possible.

Intermittent drive mechanism for the roller

A preferred embodiment of a mechanism by which the drive roller 16 is actuated during successive withdrawal movements for the ingot is shown in perspective in FIG. The shaft 20 is driven counterclockwise by a suitable motor (not shown), such as, for example, an induction motor _t as shown in FIG. 2, as indicated by the arrow. Serving as control cams cams or eccentrics 22 and 2k are wedged on the shaft 20 and rotate with her. A shaft 26 is through a suitable gear (not shown)

60981 1/0709

connected to the roller 16 serving to withdraw the ingot. A first Nockenstößeleinhoit, which is generally provided ιιιχέ dom reference numeral 28, is keyed on the shaft 26 and drives it; this unit has a number of cam rollers 30 a, 30 b and 30 c, which are aligned and run one after the other against the cam 22 serving as a control cam, as will be described in detail. A second cam follower unit 32, indicated generally at 32, is also ^{keyed to 1} WSLIe 26 to drive it. This cam follower similarly carries a series of cam rollers 3k a ·, 3 ^ b and 3k c which are arranged to successively run against the cam 2k and come into engagement with it.

From the cross-sectional view shown in Fig. 3 it can be seen that the cam roller 30a of the cam runs on the cam 22 at a point which is above the line xx which forms an axis and connects the axes of the shafts 20 and 26 with one another. As a result of this, the cam roller 30 a of the cam drives the shaft 26 as shown in FIG. 3 counterclockwise, or at least limits the possible. Clockwise movement of shaft 26 in relation to shaft 20. Furthermore, it can be seen that the cam roller 3k a comes into engagement with the nook 2k at a point below the line :: - :: which the axes of the shafts 2o and 26

S0981 1 / Q709

connects with each other. As a result, the cam roller "J> ^l la drives the shaft 26 in the clockwise direction, or at least limits the rotation of that shaft in relation to the shaft 20 in the counterclockwise direction.

The designed as Stcuerkurven surfaces of the cams 22 and 2.k are shaped so that with a uniform 'drive rotation -of the shaft 20, the successive positions which are exerted by the shaft 26, a first period of time during which the shaft 26 moves progressively forward (so that the billet is withdrawn from the mold) and define a second period of approximately equal duration during which the shaft 26 is held against rotation (and the billet stands still). The mechanical effects occurring in this case can be seen if one follows the shapes of the cams shown for explanation in FIG. 3. The shaft 26 makes a third turn for every full rotation of the shaft 20.

During the previously described sequence of movements and the damii. associated effects come the cam rollers 30 a, 30 b and 30 c of the cam successively with the cam 22 at points above the LMe :: - ?: (Fig. 3) in engagement, while the cam rollers 3 '± a, 3 ^ b and 3 ** c one after the other with the cam 2k at points below the line:; - x come into engagement. The cams 22 and 2'i are

shaped so that the shaft 26 is securely fixed in a bcstinnu .-. i position at all times. That means the following /

509811/0709

BATH ORIGINAL

If the shaft 20 is in any particular rotational position, the shaft 26 is controlled by the cams and cam followers are also fixed in a specific threatening position. However, it turned out that when the wool is fixed 26 not only a certain, necessary play or dead gait occurs, but that, moreover, the device is subjected to wear in a manner that is too unpredictable and varying deviations from the desired position.

When the shaft 20 rotates at a uniform angular velocity, the movement imparted to the shaft includes a first period of rotation _of

approx. 180 ° of the shaft 20, the shaft 26 during this period of time rotates in the direction of the roller 26 serving to withdraw the ingot in the direction drive in which the bar is removed. The magnitude of this movement used to withdraw the ingot, as it is transmitted by the drive gear, transmits a billet draw of approximately three quarters of an inch. The turning speed increases continuously and then decreases during this period, so that a steady and stepless acceleration and Decrease in speed or braking of the roller 16 and the ingot 14 results. During the rest of the part

509811/0709 _{BAD 0R} , q _1N au

one full rotation of the shaft 20, the shaft 26 is driven in a slight reverse motion. The magnitude of this rotation is sufficient to cause a reverse movement on the roll 16 on the billet on the roll 16 to deliver. The amount of this twist may, for example, be approximately 0.635 nim (25/1000 of an inch), although corresponding the respective system can deviate upwards or downwards from this value.

Mechanism for applying an instantaneous inverse force.

Dor mechanism which an instantaneous, reverse force exerts on the bars jA in the time at which the standstill begins, is shown in Figs. ^L i _r 5 and 5 a. As can be seen particularly well in Fig. K , the roller l6, which drives the bar ΐΛ, an extension auff which is attached with bolts or screws 36 a and forms an inner part 36 c of a bushing bearing. This part has an integral with it, provided with a flange section 36b, which in turn receives the fastening bolts or screws 38 (see FIGS. K and 5) which rigidly fasten a part of a disc brake to it . An outer part of the bush bearing ^ 2 (see Fig. ^ L) is attached to an upright supporting wall ^ 3.

B09811 / 0709

The rotor part 4O of the disc brake forms a part a two-part brake mechanism, the other part being a shoe or operating unit that encompasses the rotor is indicated generally at 44 (see Figures 4, 5 and 5 a). This encompassing the brake discs The shoe unit has the conventional structure of a disc brake for a motor vehicle and contains a housing 44 a, which is attached to a frame or a bracket 44 b by means of bolts or screws 44 c. The frame 44 b is from the part of the bush bearing and the protruding, short end 36 d of the shaft 36 depending a hanger 44 d g "ehaltert, which is carried by a bush bearing 44 e and also by the bush bearing 42 and the Strap / ± 3 is supported. The frame 44 b still has a horizontal transverse plate 44 f, which in turn has a downward protruding or. hanging lock latch 44 g. The entire brake including the parts 42, 43, 44 to 44 g forms a structure that, when used the brake tends to rotate with shaft 16 and the short end 36 of the shaft, if this Rotation is not limited by stop elements that engage the stop 44 g.

The housing 44 a of the brake shoe unit 44 forms a cylinder 44 h (see FIG. 5), which in turn is a piston

509811/0709

44 j picks up. A fluid medium exerts pressure on the rear surface of the piston 44 j through a connection connection 44 k for the fluid medium (see FIG. 5) which is provided for this purpose. A pair of brake shoes 44 m (see FIGS. 4- and 5) spans the disk 4o and is used to exert a braking effect in

Frictional engagement with it through the pressure of the fluid Ilcdium pressed, which is supplied through the port 44 k and a pressure against the rear surface of the piston 44 j generated. With normal use of the here described Device is a predetermined, constant pressure of the fluid medium exerted, so that a previously certain, constant braking resistance for the rotation of the disk 4O results.

A II old plate 46 (see Fig. 4,5 and 5a) is on the Frame of the device (not shown) fixed by bolts or screws 46 a (see Fig. 5). The plate 46 carries an adjustable billet retracting stop assembly, indicated generally by the numeral 48 is provided (see Fig. 5 and 5a) · This for Locking serving unit contains an outwardly projecting support plate 48 a, which has a thread adjustable, horizontally aligned stop screw 48 b receives. This screw is held by a lock nut 48 c held in the set position. It can be

BATH ORIGINAL

S09811 / 0709

recognize that the stop screw 48 b with the stop 44 g of the brake member 44 comes into engagement to the oscillating movement of the brake member in the direction against the To limit clockwise as shown in FIG.

A stationary stop unit, indicated generally at 52, (see Figs. 4, 5 and 5a) includes a sleeve or socket 52a which is attached to the support plate 46 in generally aligned relation to the stop screw 48b. This bushing has a threaded end 52 b, a cylindrical bore 42 c with a smaller diameter and an end surface 52 d with an opening 52 e receiving a stop bolt or stop pin. The stop pin 5 ^ * is arranged in the bore 52 c, its end 5 ^ a extending through the opening 52 e, as shown in FIGS. 5 and 5 a. An annular shoulder 54 b on the stop pin 5 ^ takes on compression springs $ 6 and 58 on its rear side, while its front side covers the edges of the opening 52 e. The springs 56 and 58 are adjustably compressed by a screw 60 which is threadedly engaged with a threaded end 52b of the sleeve 52. A lock nut 6O a holds the screw 60 in the setting position. As shown in Fig. 5, the following effect results: the roller l6 is rotated in the counterclockwise direction as shown in this figure,

509811/0709

so the stop 44 g comes into engagement with the stop 48, the stop pin 54 extending outside the stop surface 52 d to come into engagement with the opposite surface of the stop. If the roller l6 and the short end 36 b of the shaft rotate in the clockwise direction as shown in FIG position shown in Fig. 5 a is reached. Subsequently the end face 52 is d with the A _NSCN i _a g 44 g engages and serves as a stationary stop, to limit in the clockwise direction by further rotation of the brake unit 44th

The device described above is adjusted for operation by first turning the stop screw 48 b is adjusted so that a movement of the stop 44 g backwards and forwards between the AnJ ^ jsfläche 52 d and the stop screw 48 b is possible, which is essentially twice as large as the desired reverse Movement of the ingot during the downtime is. For example, amounts to the withdrawal movement of the bar about 1.9 cm (three quarters of an inch) so the initial setting of screw 48b could be about 1.27 mm (0.050 inch), whereby on the roller 16 a reverse movement of the ingot 14 of approximately

50981 1/0709

0.635 mm (0.025 inch) is produced. The preload exerted by springs 56 and 50 is adjusted by screw 60 to a value sufficient to exert a reverse force on stop 52d with the stop pin depressed, as shown in FIG. 5a. In practice, a force of approximately 450 pounds has been used. The pressure of the fluid medium, which via the connection ^l i ^! k k acts on the piston ^l ih j to increase the braking force, is then set to such a value that a slip or slip torque of the brakes is generated which is slightly greater than the torque generated by the springs 56 and 58 is produced. It has been found that these settings are not critical, so that the braking pressure, the spring pressure and the setting of the stationary stop can be varied over a wide range without thereby achieving the efficient and reliable continuous casting process which is characteristic of the present invention However, it is essential that the brake and associated parts are present and working as described above.

509811/0709

It is not known why the device was after the The present invention work so surprisingly effectively. However, it is "believed that this is a consequence of the current application of a reverse Torque on the roller 16 at the point in time at which the. Forward speed of the roller at the end of the the stroke used to withdraw the ingot falls to zero; this application of the reverse torque is effective over a limited reverse movement of the ingot. During the rotation of the roller 16, which is used to remove the ingot, the cam 24 drives the roller over the Cam roller 34 a (or, with the following strokes, the cam rollers 34 b and 34 c) and the intermediate gear forward, which is provided between the shaft 26 and the roller l6. The dead gear in the forward direction or the leeway in the system is taken up at this point. After the maximum of speed is reached in the forward direction, the cams 22 and 24 act with their respective cam rollers together to produce a torque either in the forward direction or in the opposite direction on the shaft 26, depending on the effects of inertia and the frictional resistance to rotation as well as idling or dead gear. The braking friction exerted on the disc 40 (and thus on the roller 16)

BAD ORIGINAL, 509811/0709

- 2k -

represents one component of the frictional resistance. At a certain point in time all the forces reducing the speed bring the roller and the ingot 14 to a standstill; At this point in time the stop kk g is in the position shown in FIG. 5 a. The springs 56 and 58 now immediately exert a reverse torque via the frictional engagement of the jaws kk u and the disk kO on the roller l6. The braking resistance is sufficient to transmit this torque without slipping or slipping, so that the bar ld is subjected to this reverse torque resulting from the springs without any time delay. This torque is further exercised by the following reverse movement of the ingot, according to the setting of the stop screw 48 b (see FIG. 5 and 5a) · Sits However, the stopper g kk against the stop screw 48 b, so the braking force now serves as a resistance and acts against further reverse movement of the ingot; up to this point the braking force tended to transmit the reverse force to the bar. During this entire process, the cams and 2k , acting through the respective cam rollers and with a released idle, drive the shaft 26 in a slight reverse motion, while the

509811/0709

Wave 26, which again works with a certain idle speed, tends to drive the roller 16 slightly in the reverse direction. The net effect of these individual movements results in a force being exerted and causing the roller 16 to move in a manner that According to experience, reliable welding of each new section of the billet to the pre-formed end of the ingot ensures, so that there is a more effective, continuously running Casting process results.

- patent claims -

BATH ORIGINAL

509811/0709

Claims (3)

Claims e 1. Peeling roller drive for a continuous casting device for ferrous metals, wherein an ingot in solid form emerges from a casting fora and is withdrawn by a roller, which is arranged at a distance from the solidification point of the ingot, in a sequence of stepwise movements in the forward direction, which is pulled through Standstill times are separated from one another, the duration of which is comparable to the duration of the forward movements, and where a slight, reverse movement is exerted on the ingot during the standstill time at the point of engagement with the roller, characterized by a two-part, constantly engaged braking mechanism (^ O, kk ), one part (40) being rigidly attached to the roller (l6) and rotatable with it, while the other part (Vl) is attached so that it is together with the first part (40) below the action of the brake application can move, and wherein the other part ( kk ) defines surfaces (44 g), which are forward ne or move backwards when the roller (l6) removes or withdraws the ingot (l4), through a stationary stop (52) in the path of the forward-facing surface, 60 981 1/0709 weiuy & ich rotates the roller (17) in the direction leading to the withdrawal of the billet, whereby the movement of the other part is locked depending on the braking effect, by an adjustable stop (48) in the path of the rearward-facing surface when the Roller (l6) rotates in the direction of the reverse movement of roller (l6), with an adjustable fixation of the movement of the other part in the reverse direction, and by means of an elastic element, ( Jk ₁ 561 58). Which provides a resistance against the Movement of the other part as a function of the rotation of the roller (l6) in the withdrawal direction of the ingot ( lk ) caused, this element (5 ^, 56, 58) exerting less forces than the braking force, so that the elastic element during the forward stroke yields until the stationary stop (52) comes into engagement and then the brake slips, so that the elastic element (5 ^, 56, 58) continues to rotate in the opposite direction moment exerted by the brake on the roller (l6) when the forward movement of the ingot ( lk ) ceases, and that finally the action of the brake offers resistance to further reverse movement when the reverse movement of the roller (l6) causes it against the adjustable stop ( kB ) is seated. 50981 1/0709 2. peeling roller drive for a contouring Gisßvcirichfcing according to claim 1, characterized by a first, driven at a uniform angular speed shaft (20), by a second shaft (26) which is in drive connection with the roller (l6), and by an intermittent one working drive for the second shaft (26) from the first shaft (20), the forward and backward movable cam and cam roller elements (22, 24, 30 a, 30 b, 30 c, 3 ^ a, 3k b , 3k c), which successively transmit rotations to the second shaft (26) for the withdrawal of the ingot ( Ik ) and the idle periods in between, the reverse rotation of the second shaft (26) in relation to the rotation in the forward direction during the Standstill period is small. 3. take-off roller drive for a continuous casting device according to one of claims 1 or 2, characterized in that the other part of the two-part brake mechanism z »r pendulum-like Performing a waving motion in relation is suspended to the axis of the roller (16), and that the surfaces formed by the other part are arranged to move forward and backward respectively 509811/0709 Swing around the axis of the roller (16). 509811/0709