EP3623077A1 - Oscillation device and corresponding method and computer program product for operating an oscillation device - Google Patents

Abstract

The invention relates to a method and a computer program product for operating an oscillation device for a continuous casting mold within a continuous casting installation for producing a casting strand. The oscillation device 100 serves to oscillate the continuous casting mold with a stroke course over at least one period in order to reduce friction between the freshly cast casting strand and the inner mold wall. In order to be able to specify individual oscillation speed profiles for individual applications or casting orders and to be able to implement them with the oscillation device, the method according to the invention provides for the area contents of a predetermined speed profile for the oscillation and the x-axis within to be determined when determining the stroke profile for the oscillation Calculate positive and negative partial areas included in a period above and below the x-axis and check whether these areas are of equal size. If this is not the case, the specified speed curve is changed or adapted accordingly. The stroke curve for the oscillation is then determined by integrating the speed curve with the partial areas of the same size.

Description

The invention relates to a method and a computer program product for operating an oscillation device for a continuous casting mold within a continuous casting installation for producing a casting strand. The invention can be used in block, billet, BBL, slab and thin slab continuous casting plants. Such continuous casting plants can be designed as vertical bending, sheet or vertical slab plants.

Furthermore, the invention relates to an oscillation device which is operated according to the method according to the invention. Known oscillation devices typically use hydraulic or electromechanical drives or adjusting elements for oscillating the mold.

State of the art:

In order to counteract the friction of the continuous shell on the mold plates, the continuous casting machines work with oscillating molds. The high-quality production of cast products requires a defined speed course of the mold oscillation depending on certain casting parameters.
The assignment criterion / selection criterion (of the oscillation curve profiles) is preferably the steel quality to be cast (steel analysis of the melt which is to be cast) and the casting speed.

The selected oscillation curve profile (speed profile) is then used for the production of a steel quality together with the variable one Production parameters "casting speed" used. The stroke height and stroke frequency are then dynamically adjusted depending on the casting speed.

Thus, among other things a targeted setting of a "negative strip value" is also possible.

Negative strip is the time range in which the mold exceeds the set casting speed in speed (in the direction of movement of the oscillation in the direction of production of the strand produced, that is, in the direction of the casting speed).

The negative strip is usually given as a percentage of an entire oscillation period. The course of the oscillation curve of the oscillation speed is the basis for the other dependencies and settings mentioned.

The procedural background for the course of the oscillation movement is a targeted reduction of the friction between the strand shell on the copper plates of the mold during the oscillation movement. The oscillation movement favors the feeding of the gap between the strand and mold plates with casting powder, casting granules or liquid lubricants (e.g. oil). The properties (including the viscosity and melting behavior) of the lubricant used (e.g. casting powder) can therefore also be a supplementary selection criterion for the selection of the oscillation curve and its parameters.

The stroke amplitudes of the mold are, for example, in the typical range around ± 3 mm (at goat speeds around 1 m / min). With a sinusoidal periodic course of the oscillation curve, a mold stroke frequency in the range of up to approx. 70 strokes per minute per m / min casting speed is set.

From the WO-2016/162141 A1 For example, the following is known: Liquid metal is poured into a continuous casting mold of the continuous casting plant. The liquid metal solidifies on the side walls of the continuous casting mold to form a continuous shell. The continuous shell is withdrawn from the continuous casting mold at a casting speed by means of a withdrawal device of the continuous casting installation with or without a still liquid core. The continuous casting mold is moved periodically in the casting direction by means of an oscillation device of the continuous casting plant. The oscillation device is controlled by a control device of the continuous caster. In a first period of the period, the movement of the continuous casting mold is a harmonic oscillation on which a speed offset is superimposed. In a second period of the period, the movement takes place at constant speed. A vibration is described as harmonic, the course of which can be described by a sine function.

From the DE-19742794-A1 Another solution to the oscillatory motion is known. In comparison to a simple sinusoidal or non-sinusoidal oscillation with comparable frequency and amplitude, the heat transfer in the mold and thus the shell formation can be controlled and the quality of the cast product can thus be specifically improved. For this purpose, it is proposed that the zero line of the mold vibrations be moved upwards and / or downwards (by a second superimposed vibration) relative to the position of the bath level during the casting process at any given strand withdrawal speed.

In the DE-19854329-A1 In addition, a method for oscillating a continuous casting mold by means of variable oscillation parameters is described. The invention described there relates to a method for oscillating a continuous casting mold by means of vertically reciprocating movements in the casting direction or in the opposite direction, the stroke and frequency of the oscillation being adjustable parameters in accordance with the casting speed and, when the mold is advancing relative to the strand, the so-called negative strip, liquid and / or solid casting medium is drawn into the gap between the mold and the strand.

The known solutions have the following disadvantages:
The oscillation curves (speed profiles) previously described in the prior art are often sinusoidal, have a sinuous character, have a sinusoidal component or are complex curve profiles over a time profile of the oscillation movement.

The generation of an oscillation curve speed curve is associated with great effort. Due to the specifically created machine code, the speed profiles can only be generated to a limited extent. Transferring the processes via data carriers (from the creation system to the control system) is cumbersome or time-consuming.

Since sinusoidal curves also restrict the degrees of freedom of generating a curve, there is a limit to the procedural requirements with the possibilities known to date in the prior art.

The invention is based on the object of developing a known method and computer program product for operating an oscillation device for a continuous casting mold and a known corresponding oscillation device such that individual oscillation speed profiles can be specified for a specific application or casting order and can be implemented in the oscillation device.

• Vorgeben eines beliebigen Geschwindigkeitsverlaufs für die Oszillation über der Periode;
• Berechnen der Flächeneinhalte der von dem Geschwindigkeitsverlauf und der x-Achse innerhalb der Periode eingeschlossenen positiven und negativen Teilflächen oberhalb und unterhalb der x-Achse;
• Prüfen, ob die Flächeninhalte der positiven und negativen Teilflächen gleich groß sind; und
• falls ja: Ermitteln des Hubverlaufs für die Stranggießkokille durch Integrieren des Geschwindigkeitsverlaufs mit den gleich großen Teilflächen oberhalb und unterhalb der x-Achse über der Periode.

In terms of process engineering, this object is achieved by the method claimed in claim 1. This is characterized in that the stroke course with which the continuous casting mold is oscillated is determined as follows:

• Specifying any speed curve for the oscillation over the period;
• Calculating the areas of the positive and negative partial areas enclosed by the speed curve and the x-axis within the period above and below the x-axis;
• Check whether the areas of the positive and negative sub-areas are the same size; and
• If yes: Determine the stroke profile for the continuous casting mold by integrating the speed profile with the same sized areas above and below the x-axis over the period.

• den Schmiermitteleinzug zwischen Innenwand der Kokille und sich bildender Schale des Gießstrangs in der Kokille zu verbessern bzw. dort die Reibung zu reduzieren;
• die Oberflächenqualität eines Gießstrangs durch die Beeinflussung der Oszillationsmarken (dies sind die Abdrücke die durch die Oszillationsbewegung auf der Strangoberfläche entstehen) in ihrer Ausprägung (Tiefe und Verlauf) zu optimieren bzw. zu verbessern; und
• den Oszillationsgeschwindigkeitsverlauf so zu gestalten, dass eine Anregung von möglichen unerwünschte Resonanzen (insbesondere die Vermeidung von Sinusschwingungen als Anregungsschwingung) bei Einrichtungen in unmittelbarer Nähe der Oszillation (z.B. Kokille, Gießbühne, Strangführung, Segmente) vermieden wird.

The claimed method offers the advantage that any desired, ie freely definable and freely parameterizable, speed profiles can be specified for the oscillation of the continuous casting mold, as is increasingly required by process engineering or metallurgy. This claimed specification of any speed profiles, adapted for a specific casting task, offers the following options:

• to improve the lubricant intake between the inner wall of the mold and the shell of the casting strand which forms in the mold or to reduce the friction there;
• to optimize or improve the surface quality of a cast strand by influencing the oscillation marks (these are the impressions that result from the oscillation movement on the strand surface); and
• to design the oscillation speed curve so that excitation of possible undesirable resonances (in particular the avoidance of sine vibrations as excitation vibrations) is avoided in devices in the immediate vicinity of the oscillation (e.g. mold, casting platform, strand guide, segments).

The term "x-axis" in the sense of the invention typically means a time or angle axis, i. H. the speed curve V for the oscillation is preferably given in the form of a V (t) or V (α) curve for the present invention. Likewise, the course of the stroke is likewise preferably given over time or over the angle, more preferably within a period. A conversion of the abscissa from a temporal dimension into an angular dimension and vice versa is possible at any time. This means that one cycle of an oscillation movement corresponds to 360 ° in the angle display and - analogously to this - a period time T in the time display.

The claimed test step, in which it is checked whether the surface area of the positive and negative sub-areas of the specified speed curve is the same size, is necessary because only if this condition is met can it be ensured that the mold is not successively offset in height by the oscillation. Conversely, this would have the disadvantage that if the partial areas are of different sizes, the mold would then gradually be offset in height by the oscillation, which is not desired.

Claim 1 initially relates to the case where the predetermined speed profile is predetermined from the outset in such a form that its partial areas above and below the x-axis actually have the same area.

According to a first exemplary embodiment, the case is dealt with in that the partial areas above the x-axis are actually not the same in the case of the arbitrarily predetermined speed profile for the oscillation. In this case, a correction of the speed curve is required, as claimed in claim 1, in order to establish the uniformity of the partial surfaces and to prevent said undesirable height shifting of the mold by the oscillation.

According to a further exemplary embodiment of the invention, the speed profile can be specified in the form of a continuous curve profile or in the form of at least three support points over a period. In the latter case, the correspondingly predefined speed curve is then preferably determined by interpolation, for example by linear interpolation.

According to a further exemplary embodiment of the invention, it is advantageous if the stroke profile determined by integration for the mold is converted to a maximum desired oscillation amplitude, for example specified in the unit mm, and / or a desired stroke frequency, ie. H. is standardized.

The predetermined speed profile for the oscillation preferably also contains a range or a time interval in which the oscillation speed in the casting direction is greater than the casting speed. This area is then the area of the “negative strip” as described above with associated advantages in the prior art.

The predefined speed curve can also be arbitrary in that it not only has one, but a plurality of zero crossings, not only an absolute maximum but also at least one local maximum and / or not only an absolute minimum, but also, for example, at least one local minimum.

The above-mentioned object is further achieved by a computer program product according to claim 8 and an oscillation device according to claim 9. The advantages of these two solutions correspond to the advantages mentioned above with regard to the claimed method.

The claimed oscillation device preferably has an input device for manually specifying any speed curve in the form of at least three support points over a period. For this purpose, the input device preferably has a display device which offers the possibility of graphically specifying the speed curve or the reference points representing the speed profile and also graphically representing an interpolation of the reference points to the speed profile for an operator. In addition to the predetermined speed profile, the display device preferably also shows the speed profile shifted to compensate for the positive and negative partial areas and / or the stroke profile ultimately calculated for the operator at least during one period. Alternatively or in addition to the manual input option, the oscillation device can also have a data interface for specifying the speed profile, e.g. B. via memory stick or network interface.

Figur 1

die erfindungsgemäße Oszillationseinrichtung;

Figuren 2a und 2b

das erfindungsgemäße Verfahren zum Betreiben der Oszillationsvorrichtung;

Figur 3

die Vorgabe des Geschwindigkeitsverlaufes in Form von Stützpunkten;

Figur 4

mögliche verschiedenartige vorgebbare Geschwindig-keitsverläufe pro Periode; und

Figur 5

die Interpolation des Geschwindigkeitsverlaufs und den "Negativ Strip"

veranschaulicht.A total of 5 figures are attached to the description

Figure 1

the oscillation device according to the invention;

Figures 2a and 2b

the inventive method for operating the oscillation device;

Figure 3

the specification of the speed curve in the form of bases;

Figure 4

possible different predefinable speed profiles per period; and

Figure 5

the interpolation of the speed curve and the "negative strip"

illustrated.

The invention is described in detail below with reference to the figures mentioned in the form of exemplary embodiments. The same technical elements are denoted by the same reference symbols in all the figures.

Figure 1 shows the oscillation device 100 according to the invention. This oscillation device 100 is used to oscillate a continuous casting mold 210 of a continuous casting plant 200. In addition to the continuous casting mold 210, the continuous casting plant 200 essentially also comprises a strand guide device 220 downstream of the continuous casting mold 210 in the casting direction R.

The mold 210 is set in oscillation, that is to say in oscillations in and against the casting direction R, in particular during a casting process for producing the casting strand 300 with the aid of the oscillation device 100. This direction of oscillation is in Figure 1 illustrated with the vertical double arrow next to the mold 210. In the casting operation, the mold 210 is filled with a molten metal. Inside the mold 210, the melt solidifies on the cooled walls of the mold and a casting strand 300 is formed with an initially still liquid core. This casting strand is pulled out of the mold and down deflected from the vertical into the horizontal with the aid of the strand guide device 220. The oscillation of the mold serves to reduce the friction between the casting strand and the walls of the mold.

The oscillation device comprises at least one, typically 2 adjusting elements, for example in the form of hydraulic cylinders or electromechanical lifting elements for oscillating the continuous casting mold. These adjusting elements 110 are controlled with the aid of a control device 120 via an actuating signal S such that a stroke curve for the oscillation of the mold 210, which is represented by the actuating signal, is established.

According to the invention, this stroke profile is calculated in advance of the oscillation by a calculation device 130 from an arbitrarily or freely predetermined (oscillation) speed profile for the oscillation.

For this determination or calculation of the stroke profile, the method according to the invention sees the in the Figures 2a and 2 B shown sequence of steps.

Process step 1:

At the beginning of the method according to the invention, a desired speed profile for the oscillation of the mold is first specified, be it as a continuous curve or in the form of at least three support points per period. Considering a period is sufficient because, as the name implies, the oscillation is periodic.

The base points can be specified in a table, as shown in the table in Figure 2a next to step 1 is illustrated.

Process step 2:

This procedural step provides that if the speed curve is initially specified only in the form of support points, these support points are interpolated to form a continuous curve. This interpolation can, for example, be linear, as shown in Figure 2a is illustrated in the graphic representation next to method step 2.

A basic curve profile of an oscillation period can now be freely set, e.g. via the variably settable reference points of the desired oscillation speeds and the respectively associated angles. can be entered in tabular form. Alternatively, a graphical entry is possible. The base points are then connected to each other (programmatically automatically) via a linear point connection. H. interpolated.

The connection between two speed points, each consisting of the coordinates speed and angle or time, then results in a linear function (in the coordinate system) for a section between two angles (or reference points) of the speed curve of the oscillation.

• f(x) = Funktionsverlauf in Abhängigkeit von x
• m = Steigung der linearen Funktion
• x = Variable
• n = Konstante

entspricht $$\mathrm{f}\left(\mathrm{\alpha }\right)=\left({\mathrm{<figure-callout\; id="3"\; label="v"\; filenames="imgf0002.png,imgf0003.png"\; state="\{\{state\}\}">v</figure-callout>}}_{\mathrm{3}}-{\mathrm{<figure-callout\; id="2"\; label="v"\; filenames="imgf0002.png,imgf0003.png"\; state="\{\{state\}\}">v</figure-callout>}}_{\mathrm{2}}\right)/\left({\mathrm{<figure-callout\; id="3"\; label="\alpha "\; filenames="imgf0002.png,imgf0003.png"\; state="\{\{state\}\}">\alpha </figure-callout>}}_{\mathrm{3}}-{\mathrm{<figure-callout\; id="2"\; label="\alpha "\; filenames="imgf0002.png,imgf0003.png"\; state="\{\{state\}\}">\alpha </figure-callout>}}_{\mathrm{2}}\right)\mathrm{\alpha }+{\mathrm{<figure-callout\; id="1"\; label="V\; c"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">V</figure-callout>}}_{\mathrm{c}}$$

für die Beispielstützpunkte 2 und 3, siehe Figur 3. Für Figur 3 gilt folgende Legende:

V

= Oszillationsgeschwindigkeit

t

= Zeit

T

= Periodenzeit einer Schwingung, Oszillationsperiode

T₁

= Oszillationskurvenanteil entgegen der Gießgeschwindigkeitsrichtung

T₂

= Oszillationskurvenanteil in Gießgeschwindigkeitsrechnung

1/2T

= Halbe Periodenzeit

A₁

= Flächenanteil (integrierter Weg, Aufwärtsbewegung)

A₂

= Flächenanteil (integrierter Weg, Aufwärtsbewegung

(1)

= Stützpunkt (Geschwindigkeit und Zeit)

V_G

= Gießgeschwindigkeitsrichtung

In this case, a linear function is referred to in mathematics as a linear normal function and therefore corresponds to the following formula: $$\mathrm{f}\left(\mathrm{x}\right)=\mathrm{mx}+\mathrm{n}$$

• f (x) = function course depending on x
• m = slope of the linear function
• x = variable
• n = constant

corresponds $$\mathrm{f}\left(\mathrm{\alpha }\right)=\left({\mathrm{v}}_{\mathrm{3rd}}-{\mathrm{v}}_{\mathrm{2nd}}\right)/\left({\mathrm{\alpha }}_{\mathrm{3rd}}-{\mathrm{\alpha }}_{\mathrm{2nd}}\right)\mathrm{\alpha }+{\mathrm{<figure-callout\; id="1"\; label="V\; c"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">V\; </figure-callout>}}_{\mathrm{c}}$$

for sample bases 2 and 3, see Figure 3 . For Figure 3 the following legend applies:

V

= Oscillation speed

t

= Time

T

= Period time of an oscillation, oscillation period

T ₁

= Part of the oscillation curve against the casting speed direction

T ₂

= Part of the oscillation curve in the casting speed calculation

1 / 2T

= Half period time

A ₁

= Area share (integrated path, upward movement)

A ₂

= Area share (integrated path, upward movement

(1)

= Base (speed and time)

V _G

= Casting speed direction

The start and end points (0 and 360 degrees) are set as a fixed required angle input. The value of the oscillation speeds for all set angular points has to be entered in mm / s, for example. The operator can make a relative reference here and thus easily create his idea of the character or the profile of the oscillation curve to be created.

The individual support points are automatically connected to one another after input into the oscillation device. The resulting complete curve (polygon) of a speed curve hereby consists of a closed combination of linear sub-functions.

Of course, in addition to linear interpolation, any other type of interpolation between the support points is also included in the present invention.

This said interpolation of the interpolation points and thus also step 2 is unnecessary if the speed curve is given immediately in the form of a continuous speed curve.

The predefined speed profile or the speed profile determined by interpolation according to method step 2 need not be sinusoidal, but can also be the in Figure 4 only accept the courses shown as examples. So the left picture shows in Figure 4 for example, an oscillation curve with 2 0 passes within an oscillation period. The right figure in Figure 4 on the other hand shows an oscillation curve with a plurality of here, for example three, minima per period.

entspricht $$\mathrm{f}\left(\mathrm{a}\right)=\left({\mathrm{v}}_{\mathrm{3}}-{\mathrm{v}}_{\mathrm{2}}\right)/\left({\mathrm{a}}_{\mathrm{3}}-{\mathrm{a}}_{\mathrm{2}}\right)\mathrm{a}+{\mathrm{V}}_{\mathrm{c}\mathrm{1}}$$

The left figure in Figure 5 once again illustrates the linear interpolation carried out in method step 2 between two predetermined interpolation points. The course of the curve between two support points corresponds to a linear normal function. For Figure 5 , left figure applies: $$\mathrm{f}\left(\mathrm{x}\right)=\mathrm{mx}+\mathrm{n}$$

corresponds $$\mathrm{f}\left(\mathrm{a}\right)=\left({\mathrm{v}}_{\mathrm{3rd}}-{\mathrm{v}}_{\mathrm{2nd}}\right)/\left({\mathrm{a}}_{\mathrm{3rd}}-{\mathrm{a}}_{\mathrm{2nd}}\right)\mathrm{a}+{\mathrm{<figure-callout\; id="1"\; label="V\; c"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">V\; </figure-callout>}}_{\mathrm{c}}$$

T_n

= Negativ Strip Zeit

T

= gesamte Periodenzeit

V

= Oszillationsgeschwindigkeit

t

= Oszillationszeit

V_G

= Gießgeschwindigkeit

f

= Oszillationsfrequenz

The right figure in Figure 5 illustrates an example of a predetermined speed curve over time resulting from the interpolation, wherein - at Plotting the casting speed V _G in the negative direction shows that this speed profile has an amount of speed during a time interval T _n that is greater than the casting speed. This time range or this time interval T _n represents the so-called “negative strip” time, as described with its advantages in the introductory part of the description. For those in the figure on the right Figure 5 The following generated legend shows the generated oscillation curve with representation of the negative strip area: $${\mathrm{T}}_{\mathrm{n}}\left(\%\right)={\mathrm{T}}_{\mathrm{n}}/\mathrm{T}$$

T _n

= Negative strip time

T

= total period time

V

= Oscillation speed

t

= Oscillation time

V _G

= Casting speed

f

= Oscillation frequency

Process step 3:

According to Figure 2a This method step 3 provides that the contents of the partial areas A1, A2 above and below the x-axis are first calculated, which are enclosed or enveloped by the speed curve calculated in method step 2. This is done with a calculation device 130 according to the invention inside or outside the oscillation device 100. The positive (above the x-axis) and negative (below the x-axis) partial areas A1, A2 determined in this way become compared with each other in terms of their area. An automatic check within the calculation device generates a corresponding correction if the areas are not identical or offers the operator of the oscillation device a possibility for correction.

Process step 4:

So that the desired curve shape or the character of the curve entered is retained, a parallel shift of the predetermined speed curve along the ordinate is carried out in order to approximate the area of the partial areas until the area of the partial areas above and below the abscissa are the same; see process step 4 in Figure 2b . This adjustment of the surface areas of the partial areas in the speed curve is necessary in the present invention, so that when the speed curve is subsequently converted into the stroke curve, the same amplitudes for oscillation in and against the casting direction can be set for the oscillation device. If the positive and negative amplitudes were not the same in the oscillation, this would have the disadvantage that the mold would be successively offset in height by the oscillation, which is not wanted.

Process step 5:

The previously determined speed curve with the same-sized partial areas above and below the x-axis per period is integrated into a stroke curve for the oscillation according to method step 5. The integration can be, for example, a numerical integration. In this way, the course of the stroke can be calculated as an oscillation period over an angle or over time.

Process step 6:

After the integration of the speed curve, the stroke curve is normalized in particular to a desired maximum stroke amplitude, e.g. B. in the amount of +/- 2mm and / or a desired stroke frequency.

The stroke curve determined in this way can be entered into the oscillation device before the start of or during an oscillation during the ongoing casting operation and can be implemented by the oscillation device. If desired, the previous stroke can also be switched to a new stroke while the oscillation is running.

Reference list

100

Oscillation device

110

Adjusting element

120

Control device

130

Calculation device

140

Input device

142

Display device

200

Continuous caster

210

Oscillation device with mold

220

Strand guide

300

Casting strand

R

Pouring direction

S

Control signal

V _G

Casting speed

Claims (14)

Method for operating an oscillation device (100) for a continuous casting mold (210) for producing a casting strand (300); preferably made of metal, comprising the following steps: Oscillating the continuous casting mold (210) with a stroke profile over at least one period; characterized, that the stroke course is determined as follows: - Specifying any periodic speed curve for the oscillation over the period; - Calculating the area of the positive and negative partial areas enclosed by the speed curve and the x-axis within the period above and below the x-axis; - Check whether the areas of the positive and negative sub-areas are the same size; and - if so:
Determine the stroke profile for the continuous casting mold by integrating the speed profile with the same sized partial areas above and below the x-axis over the period. Method according to claim 1,
characterized,
that - if a deviation between the size of the positive and the negative partial area per period is determined during the check - the following intermediate step is carried out before the stroke course is determined: - Shifting the predetermined speed curve so that a shifted speed curve is created, in which the shifted speed curve and the x-axis within the Period included positive and negative partial areas above and below the x-axis are each the same size; and
that when the stroke profile is determined, the shifted speed profile is used as the speed profile with the partial areas of the same size. Method according to one of the preceding claims,
characterized,
that the speed curve is specified in the form of a continuous curve or in the form of at least three support points over the period. Method according to claim 3,
characterized,
that the interpolation points are interpolated to the speed curve. Method according to one of the preceding claims,
characterized,
that the stroke curve determined by integration is normalized to a maximum desired oscillation amplitude. Method according to one of the preceding claims,
characterized,
that the speed curve for the oscillation is specified such that the speed in the casting direction is greater than the casting speed during a time interval. Method according to one of the preceding claims,
characterized,
that the given speed curve for the oscillation is a A plurality of zero crossings, at least one local maximum and / or at least one local minimum. Computer program product which can be loaded directly into the memory of a computer and has software code sections with which the steps according to one of the preceding method claims are carried out when the computer program product runs on a computer. Oscillation device (100) for a continuous casting mold (210) for producing a casting strand (300), with
at least one adjusting element (110) for oscillating the continuous casting mold (210); and
a control device (120) for actuating the adjusting element (110) with an actuating signal (S) which represents a stroke profile for oscillating over a period;
characterized,
that the control device (120) is designed to operate the oscillation device (100) according to the method according to one of the preceding claims 1-7. Oscillating device according to claim 9,
marked by
a calculation device (130) which is designed to determine the stroke profile as follows: - Calculating the area of the positive and negative partial areas enclosed by the speed curve and the x-axis within the period above and below the x-axis; - Check whether the areas of the positive and negative sub-areas are the same size; and - if yes: determining the stroke profile for the continuous casting mold by integrating the speed profile with the same-sized partial areas above and below the x-axis over the period; and wherein the calculation device (130) is further configured to transmit the determined stroke profile to the control device. Oscillating device according to claim 10,
characterized,
that the calculation device (130) is further designed to carry out the following intermediate step before determining the stroke profile if a deviation of the positive partial area contents from the negative partial area contents is determined during the test: - Shifting the predetermined speed curve for the oscillation over the period in such a way that a shifted speed curve arises in which the positive and negative partial areas enclosed by the shifted speed curve and the x-axis within the period become the same size above and below the x-axis ; and - Determining the stroke curve for the continuous casting mold (210) by integrating the shifted speed curve as the speed curve with the partial areas of the same size over the period. Oscillating device according to one of claims 9 to 11,
characterized,
that the calculation device (130) is designed to interpolate the specified speed profile if this is only specified in the form of at least three interpolation points over the period. Oscillating device according to one of claims 10 to 12,
marked by
an input device (140) for specifying or inputting the arbitrary speed profile, in the form of at least three support points per period. Oscillating device according to claim 11,
characterized,
that the input device (140) is assigned a display device (142) for graphically displaying the predetermined speed curve, the shifted speed curve and / or the calculated stroke curve at least during one period.

Images