Induction heating device, method, production line, use of such an induction heating device, use of such a method and use of such a production line

Abstract

The invention relates to an induction heating device (1) for heating metallic workpieces (2) conveyed in a conveying direction (R1), wherein the induction heating device (1) has at least one first oscillating circuit (10) for generating a magnetic field for heating metallic workpieces (2), wherein the first oscillating circuit (10) has at least one first coil (11) and a first capacitor device (12) electrically connected to the first coil (11). The first coil (11) is mounted so as to be positionally adjustable in a first direction (R2) such that a first normal distance between the first coil (11) and a workpiece (2) located in the induction heating device (1) can be changed, and the first coil (11) is mounted so as to be positionally adjustable in a second direction (R3).The induction heating device (1) has an adjusting device (30) for adjusting a position of the first coil (11) in the first direction (R2), and a detecting device (60) for determining shape and / or position data of at least one conveyed metallic workpiece (2).

Description

[0001] The present invention relates to an induction heating device for heating metallic workpieces and a production line for manufacturing and / or processing metallic workpieces. The present invention further relates to a method for heating metallic workpieces.

[0002] The invention further relates to the use of such an induction heating device, such a production line and such a method.

[0003] Known induction heating devices for heating continuous metallic workpieces have coils that are fixed relative to the metallic workpieces and / or are adjustable in position vertically and / or horizontally relative to a conveying direction of the metallic workpieces, wherein the metallic workpieces are guided past the respective coil in a conveying direction.

[0004] The coils of known induction heating devices are supplied with electrical energy from an electrical energy source by means of power electronic components such as transformers, inverters, rectifiers and capacitors.

[0005] In induction heating devices with coils that are stationary relative to the metal workpieces, the electrical connection between the power electronic components and the coils can be designed to be particularly short. However, with coils that are stationary relative to the metal workpieces, the distance between the stationary coils and the metal workpieces is always designed such that even metal workpieces with the largest possible dimensions, viewed transversely to the conveying plane of the respective induction heating device, do not collide with the stationary coils. This means that the coils must always be spaced at the greatest possible safety distance from the metal workpieces. However, this specified safety distance results in a significant reduction in the achievable electrical efficiency of the respective induction heating device.

[0006] In induction heating devices with coils that can be adjusted vertically and / or horizontally relative to the metal workpieces, the freedom of movement of the coils in the horizontal and / or vertical direction relative to the conveying direction of the metal workpieces is limited by the electrical connection between the power electronic components and the coils. With electrical connections via busbars, relative movement between the power electronic components and the coils is not possible in known induction heating devices. With electrical connections via cables, the maximum horizontal and / or vertical displacement of the coils is limited by the length of the electrical cables. If the cables are made longer to increase the maximum horizontal displacement, the power losses increase due to the extended cable length.

[0007] The present invention is based on the object of providing an induction heating device by which, on the one hand, the electrical efficiency between the coils and the metallic workpieces is improved and, on the other hand, the power losses in the electrical connection between the power electronic components and the coils are reduced.

[0008] This object underlying the present invention is achieved by an induction heating device having the features of claim 1. Advantageous embodiments of the induction heating device are described in the dependent claims.

[0009] More specifically, the object underlying the present invention is achieved by an induction heating device for heating metallic workpieces conveyed in a conveying direction, wherein the induction heating device has at least one first resonant circuit for generating a magnetic field for heating metallic workpieces, wherein the first resonant circuit has at least one first coil and a first capacitor device electrically connected to the first coil. The first coil is mounted so as to be positionally adjustable in a first direction such that a first normal distance between the first coil and a workpiece located in the induction heating device is variable, and the first coil is mounted so as to be positionally adjustable in a second direction.The induction heating device has an adjustment device for adjusting a position of the first coil in the first direction, and the induction heating device has a detection device for determining shape and / or position data of at least one conveyed metallic workpiece. The induction heating device has a control unit for controlling and / or regulating a position of the first coil in the first direction, wherein the control unit is data-connected to the detection device and the adjustment device, and wherein the control unit is configured to carry out the following method steps: . - Determining shape and / or position data of at least one conveyed metallic workpiece at a first time by means of the detection device, and - Adjusting a position of the first coil in the first direction by means of the adjusting device, taking into account the determined shape and / or position data of the at least one conveyed metallic workpiece, such that a first gap width between the metallic workpiece and the first coil in the first direction is set to a desired gap width at a second time following the first time.

[0010] An induction heating device designed in this way has the advantage that the gap width between the first coil and the metallic workpieces in the first direction can be adjusted not only partially, but also as desired over the entire length of the metallic workpieces. This allows for shape and position tolerances to be taken into account over the entire length of the metallic workpieces and advantageously compensated for by appropriately shifting the first coil in the first direction relative to the metallic workpieces. This makes it possible to apply an adjustable, preferably uniform, heat input and / or achieve optimal efficiency to the metallic workpieces over their entire length along the conveying direction. This significantly reduces the amount of material waste.

[0011] A metallic workpiece can be formed as a substantially flat workpiece. The workpiece can be formed as a metal slab, a metal strip, or a formed blank.

[0012] A substantially flat workpiece within the scope of the invention has a thickness extension that is substantially smaller than a width extension and a length extension.

[0013] A metallic workpiece has a first side and a second side opposite the first side. The first direction is preferably oriented orthogonally to the first side and the second side of the metallic workpiece. The first side and the second side delimit the metallic workpiece in the thickness direction of the metallic workpiece. In the case where the conveying direction is oriented horizontally, the first side of the metallic workpiece can be referred to as the top side and the second side of the metallic workpiece as the bottom side.

[0014] A metallic workpiece has a first outer edge and a second outer edge. The first outer edge and the second outer edge are preferably opposite sides of the metallic workpiece. The first outer edge and the second outer edge of the metallic workpiece delimit the metallic workpiece in the widthwise extent of the metallic workpiece.

[0015] A metallic workpiece has a head region. The head region is a front region of the metallic workpiece as seen in the conveying direction of the metallic workpiece. The size or length of such a head region can vary. For example, the length of the head region can depend on the thickness of the metallic workpiece. For example, the head region has a length of 100 mm or 150 mm or more, measured from a front end face of the metallic workpiece. For example, the size or length of the head region can also depend on the type of deformation, for example caused by a cutting process on a material strand. In particular, the head region can also have a ski deformation or the like.

[0016] A metallic workpiece has a base region. The base region is the rear region of the metallic workpiece, as seen in the conveying direction of the metallic workpiece. The base region can be configured as described above for the head region and can extend over a length of 100 mm or 150 mm or more, measured from a rear end face of the metallic workpiece.

[0017] Due to the analogy between the head area and the foot area, for the sake of simplicity we will refer only to the head area from now on, even though the foot area is also included.

[0018] Joined endless metallic workpieces, for example welded or stapled belts, also have a head and tail area at the points where the connection was made, since the anomalies described above can occur at the connection points there.

[0019] The length of a metallic workpiece is the length of the metallic workpiece in the direction of conveyance.

[0020] The thickness extension of the metallic workpieces is the extension of the metallic workpieces in the direction of the first direction.

[0021] The width dimension of a metallic workpiece is the dimension of the metallic workpiece in the direction of the second direction.

[0022] The conveying direction, the first direction, and the second direction form an orthogonal coordinate system. The conveying direction and the second direction define a conveying plane. A plane defined by the length and width of a metallic workpiece conveyed in the conveying direction is preferably aligned parallel to the conveying plane.

[0023] Typically, the conveying direction is horizontal. Therefore, the second direction is also horizontal and orthogonal to the conveying direction, so that the conveying plane is horizontal. The first direction is vertical and orthogonal to both the conveying direction and the second direction.

[0024] The shape and / or position data of the conveyed metallic workpiece include shape and / or position data of the conveyed metallic workpiece in the first direction. Furthermore, the shape and / or position data of the conveyed metallic workpiece can include shape and / or position data of the conveyed metallic workpiece in the second direction and / or in the conveying direction.

[0025] A gap width is the normal distance between a coil and the side of a metallic workpiece conveyed in the conveying direction facing it in the first direction. Consequently, the first gap width is the first normal distance between the first coil and the side of a metallic workpiece conveyed in the conveying direction facing it in the first direction. A first gap width can be adjusted by adjusting the position, for example, by shifting and / or moving the first coil in the first direction.

[0026] A first gap width can be preset by adjusting the position of the first coil in the first direction before and / or while a metallic workpiece runs past the first coil or into the working area of the first coil, so that the first gap width is actually present when the metallic workpiece runs past the first coil or into the working area of the first coil.

[0027] A working area of a coil is the area in which a magnetic field generated by the coil interacts with a metallic workpiece to heat the metallic workpiece.

[0028] The first capacitor device may comprise a single capacitor or a plurality of capacitors. The plurality of capacitors may be connected in parallel.

[0029] The adjusting device can be configured to adjust a position of a second coil in the first direction.

[0030] The adjusting device may comprise one or more hydraulic cylinders, rack and pinion drives or toggle levers for adjusting a position of the first coil and / or a second coil in the first direction.

[0031] The detection device can comprise a first sensor device for detecting a geometric profile of the conveyed metallic workpieces on a side of the metallic workpieces facing the first coil, wherein a first effective range of the first sensor device is arranged upstream of the first coil with respect to the conveying direction of the metallic workpieces. The detection device can, for example, determine the distance to a workpiece optically, for example using a laser.

[0032] An induction heating device designed in this way has the advantage that a first gap width between the first coil and the conveyed metallic workpieces can be adjusted such that the metallic workpieces can always be subjected to an adjustable heat input and / or optimal efficiency along their length, despite the existing shape and position tolerances of the metallic workpieces. Because the effective range of the sensor device is arranged upstream of the first coil with respect to the conveying direction of the metallic workpieces, the information of the geometric profile is fixed at a point on the conveyed metallic workpieces before this point passes the first coil. With a detection device designed in this way, the shape data of the metallic workpieces correspond to the geometric profile of one side, for example the top or bottom, of the metallic workpieces.

[0033] The detection device can be designed as the first sensor device.

[0034] The detection device can have a second sensor device for detecting a geometric profile of the conveyed metallic workpieces on a side of the metallic workpieces facing a second coil, wherein a second effective range of the second sensor device is arranged in front of the second coil with respect to the conveying direction of the metallic workpieces.

[0035] The control unit is designed as an electronic control device and is configured to receive data, store data, process data and control and / or regulate one or more receiver devices, in particular one or more adjustment devices, taking data into account.

[0036] The control unit can be connected to the detection device and the adjustment device via a cable or wirelessly.

[0037] The determination of shape and / or position data of the conveyed metallic workpieces at a first point in time by means of the detection device is preferably carried out in such a way that the detection device detects the shape and / or position data of the conveyed metallic workpieces at a first point in time and transmits them to the control unit.

[0038] The adjustment of the position of the first coil in the first direction by means of the adjustment device taking into account the determined shape and / or position data of the conveyed metallic workpieces is preferably carried out in such a way that the control unit transmits adjustment data to the adjustment device.

[0039] The target gap width is a predetermined normal distance between a coil and the side of a metallic workpiece being conveyed in the conveying direction facing it at a specific time. The target gap width can be specified depending on the geometry, in particular the dimensions, of the conveyed metallic workpiece. Furthermore, the target gap width can be specified depending on a result to be achieved through the inductive heat treatment. For example, a specific microstructure, such as a martensitic microstructure, can be a desired result in the metallic workpiece. The target gap width can also take into account target temperatures of the conveyed metallic workpieces.For example, target temperatures can be specified, for example in the form of a target temperature profile along the width and / or length and / or thickness of a given metallic workpiece, which are to be achieved by means of the induction heating device. The target gap widths can take into account the required target temperatures of the conveyed metallic workpieces and the power at which the induction heating device is operated.

[0040] The target gap width can have a minimum value. In particular, the target gap width can have a value of less than or equal to 60 mm, preferably a value of less than or equal to 40 mm, and particularly preferably a value of less than or equal to 20 mm.

[0041] The first time and / or the second time can be a time / times before and / or while a metallic workpiece, in particular a head region of the metallic workpiece, runs past the first coil and / or into the working area of the first coil.

[0042] An induction heating device designed in this way has the advantage that the first gap width can be set and continuously readjusted before and / or during the metallic workpiece's entry onto the first coil and / or into the working area of the first coil along the length of the metallic workpiece. This allows for improved adjustment, preferably uniform adjustment, of the heat input and / or optimal efficiency into the metallic workpieces across their entire length along the conveying direction. This further reduces the amount of material waste.

[0043] A further advantage of an induction heating device designed in this way is that the head area of the metal workpiece is heat-treated just as well as the rest of the metal workpiece, especially the central area, which immediately adjoins the head area, and the foot area, which immediately adjoins the central area. This further reduces the amount of material waste.

[0044] A further advantage of an induction heating device designed in this way is that the risk of collision between the metallic workpiece and the first coil is reduced. Deformations, caused for example by a cutting and / or joining process on a material strand, occur more frequently in the head area of metallic workpieces. In particular, the head area can also exhibit ski deformation or the like. By presetting the gap width, taking into account the shape and / or position data of the metallic workpieces, it can be preset in such a way that collisions are avoided and, at the same time, uniform heat input and / or optimal efficiency into the metallic workpiece are ensured. This can further reduce the amount of material waste.

[0045] The induction heating device is preferably designed such that the induction heating device has a second coil, and the second coil is mounted so as to be positionally adjustable in the first direction such that a third normal distance between the second coil and a workpiece located in the induction heating device can be changed. The second coil is preferably mounted so as to be positionally adjustable in a second direction, and the adjustment device is configured to adjust a position of the second coil in the first direction.

[0046] The induction heating device may comprise additional coils, each of which is mounted so as to be adjustable in position in the first direction and / or the second direction. The additional coils may each be electrically connected to the first capacitor device.

[0047] Preferably, the adjustment device is configured to adjust a position of the first coil in the first direction and a position of the second coil in the first direction independently of one another. In other words, for example, a position of the first coil can be adjusted in the first direction while a position of the second coil in the first direction is not adjusted, or vice versa.

[0048] An induction heating device designed in this way has the advantage that a first gap width between the first coil and the metallic workpieces and a second gap width between the second coil and the metallic workpieces can be adjusted independently of one another and, in particular, as desired, over the entire length of the metallic workpieces. This makes it possible to apply an adjustable, preferably uniform, heat input and / or achieve optimal efficiency to the metallic workpieces over their entire length along the conveying direction. This reduces the amount of material waste.

[0049] The control unit may be configured to control and / or regulate a position of the second coil in the first direction.

[0050] In particular, the control unit can be configured to control and / or regulate a position of the first coil in the first direction and / or a position of the second coil in the first direction independently of one another.

[0051] The control unit can be configured to carry out the following method step: - Adjusting a position of the second coil in the first direction by means of the adjusting device, taking into account the determined shape and / or position data of the at least one conveyed metallic workpiece, such that a second gap width between the metallic workpiece and the second coil in the first direction is set to a desired gap width at the second time.

[0052] The second gap width is the second normal distance between the second coil and the side facing it of a metallic workpiece conveyed in the conveying direction in the first direction.

[0053] The adjusting device can be configured to adjust a position of the first coil in the second direction and / or a position of the second coil in the second direction, preferably independently of each other.

[0054] The adjustment device may comprise one or more travel units, trolleys, wheel-rail systems and / or sliding systems for adjusting a position of the first coil and / or the second coil in the second direction.

[0055] The control unit can be configured to control and / or regulate a position of the first coil in the second direction and / or a position of the second coil in the second direction independently of one another.

[0056] The control unit can be configured to carry out the following process steps: - Adjusting a position of the first coil in the second direction by means of the adjusting device, taking into account the determined shape and / or position data of the at least one conveyed metallic workpiece, such that a first edge distance between the metallic workpiece and the first coil in the second direction is set to a desired edge distance at the second time, and / or - Adjusting a position of the second coil in the second direction by means of the adjusting device, taking into account the determined shape and / or position data of the at least one conveyed metallic workpiece, such that a second edge distance between the metallic workpiece and the second coil in the second direction is set to a desired edge distance at the second time.

[0057] An induction heating device designed in this way has the advantage that an increased heating homogeneity of the metallic workpieces can be achieved, in particular an increased heating homogeneity in the width extension of the metallic workpieces.

[0058] In longitudinal field induction, the currents induced by the first coil in a metallic workpiece run in the opposite direction to the currents induced by the second coil. The currents induced by the first coil in the metallic workpiece run along the width direction on the first side of the metallic workpiece and join the currents induced by the second coil in the metallic workpiece via the first outer edge of the metallic workpiece. The currents induced by the second coil in the metallic workpiece run along the width direction of the metallic workpiece on the second side of the metallic workpiece in the opposite direction to the currents induced by the first coil and in turn join the currents induced by the first coil via a second outer edge of the metallic workpiece.As a result, the induced currents of the first and second coils form a closed circuit in a plane orthogonal to the conveying direction of the metallic workpiece. Thus, in particular, no current is induced that runs in the direction of the conveying direction at the first outer edge and / or the second outer edge.

[0059] This prevents overheating of the outer edges, so that the metallic workpiece experiences increased heating homogeneity across the width of the metallic workpiece during inductive heating.

[0060] The first coil and the second coil preferably each have at least one turn, wherein each turn is formed by at least two conductor profiles connected via a connecting web.

[0061] The edge distance is the distance between the connecting web of a coil and an outer edge of a metal workpiece conveyed in the conveying direction in the second direction. Consequently, the first edge distance is the distance between the connecting web of the first coil and an outer edge of a workpiece conveyed in the conveying direction. The second edge distance is therefore the distance between the connecting web of a second coil and an outer edge of a workpiece conveyed in the conveying direction.

[0062] The first coil and / or the second coil can be displaced in the first direction and, at least partially, displaced in the second direction in a temporally overlapping manner.

[0063] The first coil and / or the second coil can be displaced in the first direction and, at the same time, displaced in the second direction in a completely overlapping manner. In other words, the displacement of the first coil and / or the second coil in the first direction begins and ends simultaneously with the displacement of the first coil and / or the second coil in the second direction.

[0064] An induction heating device designed in this way has the advantage that, for example, when transferring the first coil and / or the second coil to a standby position, an operative connection between the coils and a metallic workpiece can be interrupted more quickly. This allows, for example, collisions to be avoided even more effectively.

[0065] Preferably, the induction heating device is designed such that the second coil and the first capacitor device are electrically connected to each other, or the second coil and a second capacitor device are electrically connected to each other.

[0066] The second capacitor device may comprise a single capacitor or a plurality of capacitors. The plurality of capacitors may be connected in parallel.

[0067] The first capacitor device and the second capacitor device can form a structural unit. In other words, the first capacitor device and the second capacitor device can be immovable relative to one another. The structural unit can be formed such that the first capacitor device and the second capacitor device are arranged in a common capacitor cabinet.

[0068] The induction heating device may comprise a second resonant circuit for generating a magnetic field for heating metallic workpieces, wherein the second resonant circuit comprises the second coil and the second capacitor device electrically connected to the second coil.

[0069] The first coil may be detachably electrically connected to the first capacitor device and / or the second coil may be detachably electrically connected to the first capacitor device and / or second capacitor device.

[0070] An induction heating device designed in this way has the advantage that the first coil and / or the second coil can be replaced quickly in the event of maintenance or repair.

[0071] Preferably, the induction heating device is designed such that the first coil and the second coil are configured to heat metallic workpieces conveyed in the conveying direction by means of transverse field induction and / or longitudinal field induction.

[0072] Preferably, the induction heating device is designed such that the first capacitor device is mounted so as to be positionally adjustable in the first direction.

[0073] An induction heating device designed in this way has the advantage that the first capacitor device can follow a movement of the first coil in the first direction and / or in the second direction. As a result, the electrical connection between the first capacitor device and the first coil can be shortened. As a result, the losses in the electrical power transmission between the first capacitor device and the first coil can be reduced. Furthermore, by separating the first capacitor device from the first coil, the mass to be moved for a movement of the first coil is reduced, particularly since the first coil would otherwise be rigidly connected to the first capacitor device. As a result, the entire system can act much more dynamically with regard to the adjustment mechanism for adjusting the first coil relative to the metallic workpiece and can therefore respond better to dynamic operating requirements.Furthermore, by reducing the mass to be moved, significantly less auxiliary energy is required to move the first coil.

[0074] The second capacitor device can be mounted so as to be positionally adjustable in the second direction.

[0075] Preferably, the induction heating device is designed such that the first coil and / or the second coil is / are mounted so as to be positionally adjustable in the first direction relative to the first capacitor device and / or to the second capacitor device.

[0076] Preferably, the induction heating device is designed such that the first coil is mounted so as to be positionally adjustable in the second direction relative to the first capacitor device.

[0077] The first coil may be mounted in the second direction relative to the second capacitor device.

[0078] The second coil may be mounted in the second direction relative to the first capacitor device and / or to the second capacitor device.

[0079] The induction heating device may comprise a capacitor adjustment device for adjusting a position of the first capacitor device and / or the second capacitor device. In particular, the capacitor adjustment device may be configured to adjust a position of the first capacitor device independently of a position of the second capacitor device.

[0080] The control unit can be configured to adjust the first capacitor device and / or the second capacitor device by means of the capacitor adjustment device, preferably depending on the movement of the first coil and / or the second coil in the first direction and / or in the second direction. The first capacitor device and / or the second capacitor device can be moved synchronously or offset in time with the movements of the first coil and / or the second coil.

[0081] An induction heating device designed in this way has the advantage that a distance between the first capacitor device and the first coil and / or a distance between the second capacitor device and the second coil does not reach or exceed a critical maximum value. This allows the length of a power transmission device, in particular a cable, between the capacitor devices and the coils to be significantly reduced, so that the power transmission losses between the capacitor devices and the coils can be further reduced.

[0082] Preferably, the induction heating device is designed such that the first coil is connected to the first capacitor device by means of a flexible energy transmission device, wherein the energy transmission device enables a change in distance between the first coil and the first capacitor device in the first direction and / or in the second direction.

[0083] The second coil can be electrically connected to the first capacitor device and / or to the second capacitor device by means of the flexible energy transmission device or a further flexible energy transmission device.

[0084] The power transmission device may comprise a cable or be designed as such. Alternatively or additionally, the power transmission device may comprise a telescopically extendable busbar or be designed as such.

[0085] An induction heating device designed in this way has the advantage that the capacitor devices can follow the movement of the coils even more effectively. This allows the entire system to operate significantly more dynamically with regard to the adjustment mechanism for adjusting the first and / or second coil relative to the metallic workpiece, thus responding even more effectively to dynamic operating requirements.

[0086] Preferably, the induction heating device is designed such that the first coil and the first capacitor device are positively coupled with respect to movement in the second direction.

[0087] In particular, a distance between the first capacitor device and the first coil may be constant in the second direction.

[0088] The second coil and the first capacitor device may be positively coupled with respect to movement in the second direction. A distance between the first capacitor device and the second coil in the second direction may be constant.

[0089] The second coil and the second capacitor device may be positively coupled with respect to movement in the second direction. A distance between the second capacitor device and the second coil in the second direction may be constant.

[0090] An induction heating device designed in this way has the advantage that the length of the energy transmission device, in particular the cables and / or busbars, is minimized. This further reduces the power losses during energy transmission between the capacitor devices and the coils.

[0091] The induction heating device may comprise a power supply device for supplying the first coil and / or the second coil with electrical energy.

[0092] The energy supply device is a device configured to provide electrical energy for operating at least one coil, in particular electrical energy with an electrical current of suitable current intensity, suitable voltage, and / or suitable frequency. The energy supply device can be designed to provide electrical energy for a plurality of coils, in particular for at least two coils, preferably for three, four, five, six, or more coils. The energy supply device can have at least one power converter, in particular an inverter, or be designed as such.

[0093] Preferably, the induction heating device is designed such that the control unit has a setpoint receiving unit for receiving setpoint gap widths for the first gap width and / or the second gap width, and a calculation unit for calculating correction values for the first gap width and / or the second gap width, wherein the control unit is configured to carry out the following method steps: - determining a first gap width between the first coil and the conveyed metallic workpiece and / or a second gap width between the second coil and the conveyed metallic workpiece at the first time; - receiving a first target gap width for the first gap width at the second time; - receiving a second target gap width for the second gap width at the second time; - Determining a first correction value for the position of the first coil in the first direction taking into account the first gap width at the first time, the determined shape and / or position data of the conveyed metallic workpiece at the first time and the first target gap width of the first gap width at the second time; - Adjusting a position of the first coil in the first direction by means of the adjusting device, taking into account the first correction value, such that a first gap width between the metallic workpiece and the first coil in the first direction is set to the first desired gap width at the second time; and / or - Determining a second correction value for the position of the second coil in the first direction, taking into account the second gap width at the first time, the determined shape and / or position data of the conveyed metallic workpiece at the first time, and the second target gap width of the second gap width at the second time; and / or - Adjusting a position of the second coil in the first direction by means of the adjusting device, taking into account the second correction value, such that a second gap width between the metallic workpiece and the second coil in the first direction is set to the second target gap width at the second time

[0094] An induction heating device designed in this way has the advantage that the gap widths can be dynamically adjusted using the recorded shape and / or position data of the metallic workpieces, allowing for responses to shape and / or positional anomalies of the metallic workpieces. This prevents collisions between the coils and the metallic workpieces. Furthermore, an adjustable, preferably uniform, heat input and / or optimal efficiency can be achieved across the entire length of the metallic workpieces. This allows for an even more significant reduction in the amount of material waste.

[0095] The control unit can be configured to additionally carry out the following process steps: - Receiving a target temperature of the conveyed metallic workpiece at the second time; - Determining the first correction value for the position of the first coil in the first direction, additionally taking into account the target temperature of the conveyed metallic workpiece at the second time; and / or - Determining the second correction value for the position of the second coil in the first direction, additionally taking into account the target temperature of the conveyed metallic workpiece at the second time.

[0096] An induction heating device designed in this way has the advantage that the first gap width and / or the second gap width can be adjusted to achieve even more uniform heat input and / or optimal efficiency into the metallic workpieces. This further reduces the amount of material waste.

[0097] Preferably, the induction heating device is designed such that the induction heating device has a coil position determination device for determining coil position data of the first coil and / or the second coil, wherein the control unit is configured to carry out the following method steps: - Determining coil position data of the first coil and / or the second coil at the first time by means of the coil position determining device, - Determining the first correction value for the position of the first coil in the first direction, taking into account the determined coil position data of the first coil, and / or - Determining the second correction value for the position of the second coil in the first direction, additionally taking into account the determined coil position data of the conveyed metallic workpiece.

[0098] An induction heating device designed in this way has the advantage that the gap width between a coil and the metallic workpieces can be adjusted more precisely. In particular, the relative distance to the metallic workpieces can be determined more accurately using the coil position data.

[0099] The coil position data preferably includes position data of the first coil and / or the second coil in the first direction. The coil position data may further include position data of the first coil and / or the second coil in the second direction and / or in the conveying direction.

[0100] The coil position data can be determined relative to a fixed reference point, such as a machine bed or the like. Alternatively, the coil position data can be determined relative to a movable reference point.

[0101] The control unit can be data-connected to the coil position detection device. The coil position detection device can be configured to transmit the coil position data to the control unit.

[0102] The coil position determination device can be a component of the detection device and in particular form a structural unit with the detection device.

[0103] Preferably, the induction heating device is designed such that the induction heating device has a temperature detection device for determining temperatures of the conveyed metallic workpieces, wherein the control unit is configured to carry out the following method steps: - Determining temperature data of at least one conveyed metallic workpiece at the first time by means of the temperature determination device, - Determining the first correction value for the position of the first coil in the first direction, taking into account the determined temperature data at the first time of the conveyed metallic workpiece, and / or - Determining the second correction value for the position of the second coil in the first direction, additionally taking into account the determined temperature data at the first time point of the conveyed metallic workpiece.

[0104] An induction heating device designed in this way has the advantage that the gap width between a coil and the metallic workpieces can be adjusted even more precisely.

[0105] The control unit can be data-connected to the temperature-detecting device. The temperature-detecting device can be configured to transmit temperature data to the control unit.

[0106] A first effective range of the temperature detection device can be arranged in front of and / or behind the first coil with respect to the conveying direction of the metallic workpieces.

[0107] A second effective area of the temperature detection device can be arranged in front of and / or behind the second coil with respect to the conveying direction of the metallic workpieces.

[0108] An induction heating device designed in this way has the advantage that the gap width between a coil and the metal workpieces can be adjusted even more precisely, taking temperature data into account. This makes it possible, in particular, to achieve a uniform heat input and / or optimal efficiency into the metal workpieces. This further reduces the amount of material waste.

[0109] Preferably, the induction heating device is designed such that the induction heating device has a dimension determination device for determining dimension data of the conveyed metallic workpieces, wherein the control unit is configured to carry out the following method steps: - Determining dimensional data of at least one conveyed metallic workpiece at the first time by means of the dimension determination device, - Determining the first correction value for the position of the first coil in the first direction, taking into account the determined dimensional data of the conveyed metallic workpiece, and / or - Determining the second correction value for the position of the second coil in the first direction, additionally taking into account the determined dimensional data of the conveyed metallic workpiece.

[0110] An induction heating device designed in this way has the advantage that the gap width between a coil and the metallic workpieces can be adjusted even more precisely.

[0111] The dimensional data of the metallic workpieces include in particular their length, width and thickness.

[0112] The control unit can be data-connected to the dimension-determining device. The dimension-determining device can be configured to transmit the dimension data to the control unit.

[0113] Preferably, the induction heating device is designed such that the induction heating device has a conveying speed determination device for determining conveying speed data of the metallic workpieces, wherein the control unit is configured to carry out the following method steps: - Determining conveying speed data of at least one conveyed metallic workpiece at the first time by means of the conveying speed determining device, and - Determining the first correction value for the position of the first coil in the first direction, taking into account the determined conveying speed data of the conveyed metallic workpiece, and / or - Determining the second correction value for the position of the second coil in the first direction, additionally taking into account the determined conveying speed data of the conveyed metallic workpiece.

[0114] An induction heating device designed in this way has the advantage that the gap width between a coil and the metallic workpieces can be adjusted even more precisely.

[0115] The conveying speed data of the metallic workpieces include in particular their conveying speed relative to the first coil and / or the second coil in the conveying direction.

[0116] The control unit can be data-connected to the conveyor speed determination device. The conveyor speed determination device can be configured to transmit the conveyor speed data to the control unit.

[0117] The setpoint receiving unit can be configured to receive setpoint edge distances for the first coil and / or the second coil.

[0118] The calculation unit can be configured to calculate correction values for the first edge distance and / or for the second edge distance.

[0119] The control unit can be configured to carry out the following process steps: - determining a first edge distance between the first coil and the conveyed metallic workpiece and / or a second edge distance between the second coil and the conveyed metallic workpiece at the first time; - receiving a first target edge distance for the first edge distance at the second time; and / or - receiving a second target edge distance for the second edge distance at the second time; - Determining a third correction value for the position of the first coil in the second direction taking into account the first edge distance at the first time, the determined shape and / or position data of the conveyed metallic workpiece at the first time and the first desired edge distance of the first edge distance at the second time; - Adjusting a position of the first coil in the second direction by means of the adjusting device, taking into account the third correction value, such that a first edge distance between the metallic workpiece and the first coil in the second direction is set to the first desired edge distance at the second time; and / or - Determining a fourth correction value for the position of the second coil in the second direction, taking into account the second edge distance at the first time, the determined shape and / or position data of the conveyed metallic workpiece at the first time, and the second target edge distance of the second edge distance at the second time; and / or - Adjusting a position of the second coil in the second direction by means of the adjusting device taking into account the fourth correction value such that a second edge distance between the metallic workpiece and the second coil in the second direction is set to the second desired edge distance at the second time.

[0120] An induction heating device designed in this way has the advantage that an increased heating homogeneity of the metallic workpieces can be achieved, in particular an increased heating homogeneity in the width extension of the metallic workpieces.

[0121] The control unit is preferably configured to additionally carry out the following method steps: - Determining the third correction value for the position of the first coil in the second direction, taking into account the determined coil position data of the first coil and / or the determined temperature data of the conveyed metallic workpiece and / or the determined dimensional data of the conveyed metallic workpiece and / or the determined conveying speed data of the conveyed metallic workpiece and / or the target temperature of the conveyed metallic workpiece at the second time, and / or - Determining the fourth correction value for the position of the second coil in the second direction with additional consideration of the determined coil position data of the second coil and / or the determined temperature data of the conveyed metallic workpiece and / or the determined dimensional data of the conveyed metallic workpiece and / or the determined conveying speed data of the conveyed metallic workpiece and / or the target temperature of the conveyed metallic workpiece at the second point in time.

[0122] The object underlying the present invention is further achieved by a method for operating an induction heating device for heating metallic workpieces by means of a previously described induction heating device, the method comprising the following method steps: - Determining shape and / or position data of at least one conveyed metallic workpiece at a first time by means of the detection device, and - Adjusting a position of the first coil in the first direction by means of the adjusting device, taking into account the determined shape and / or position data of the at least one conveyed metallic workpiece, such that a first gap width between the metallic workpiece and the first coil in the first direction is set to a desired gap width at a second time following the first time, and / or - Adjusting a position of the second coil in the first direction by means of the adjusting device, taking into account the determined shape and / or position data of the at least one conveyed metallic workpiece, such that a second gap width between the metallic workpiece and the second coil in the first direction is set to a desired gap width at a second time following the first time.

[0123] A method designed in this way has the advantage that a gap width between a coil and the metallic workpieces in the first direction can be adjusted not only partially but as desired over the entire length of the metallic workpieces, so that shape and position tolerances can be taken into account over the entire length of the metallic workpieces and advantageously compensated for by means of suitable displacement of the coils in the first direction relative to the metallic workpieces. This makes it possible to apply an adjustable, preferably uniform, heat input and / or optimal efficiency to the metallic workpieces over their entire length along the conveying direction. This significantly reduces the amount of material waste.

[0124] Preferably, the method for operating an induction heating device for heating metallic workpieces by means of a previously described induction heating device, wherein the control unit has a setpoint receiving device for receiving setpoint gap widths for the first gap width and / or the second gap width, and a calculation unit for calculating correction values for the first gap width and / or the second gap width, comprises the following method steps: - Determining a first gap width between the first coil and the conveyed metallic workpiece and / or a second gap width between the second coil and the conveyed metallic workpiece at the first time, - receiving a first target gap width for the first gap width at the second time, and / or - Receiving a second target gap width for the second gap width at the second time, - Determining a first correction value for the position of the first coil in the first direction taking into account the first gap width at the first time, the determined shape and / or position data of the conveyed metallic workpiece at the first time and the first target gap width of the first gap width at the second time, - Adjusting a position of the first coil in the first direction by means of the adjusting device, taking into account the first correction value, such that a first gap width between the metallic workpiece and the first coil in the first direction is set to the first desired gap width at the second time, and / or - Determining a second correction value for the position of the second coil in the first direction taking into account the second gap width at the first time, the determined shape and / or position data of the conveyed metallic workpiece at the first time and the second target gap width of the second gap width at the second time, and / or - Adjusting a position of the second coil in the first direction by means of the adjusting device taking into account the second correction value such that a second gap width between the metallic workpiece and the second coil in the first direction is set to the second desired gap width at the second time.

[0125] The method is preferably designed such that the method comprises the following method steps: - Determining coil position data of the first coil and / or the second coil at the first time by means of the coil position determining device, and / or - Determining temperature data of at least one conveyed metallic workpiece at the first time by means of the temperature determination device, and / or - Determining dimensional data of at least one conveyed metallic workpiece at the first time by means of the dimension determination device, and / or - Determining conveying speed data of at least one conveyed metallic workpiece at the first time by means of the conveying speed determining device, and / or - Receiving a target temperature of the conveyed metallic workpiece at the second time, - Determining the first correction value for the position of the first coil in the first direction, taking into account the determined coil position data of the first coil and / or the determined temperature data of the conveyed metallic workpiece and / or the determined dimensional data of the conveyed metallic workpiece and / or the determined conveying speed data of the conveyed metallic workpiece and / or the target temperature of the conveyed metallic workpiece at the second time, and / or - Determining the second correction value for the position of the second coil in the first direction with additional consideration of the determined coil position data of the second coil and / or the determined temperature data of the conveyed metallic workpiece and / or the determined dimensional data of the conveyed metallic workpiece and / or the determined conveying speed data of the conveyed metallic workpiece and / or the target temperature of the conveyed metallic workpiece at the second point in time.

[0126] The method is preferably designed such that the method comprises the following method steps: - determining a first edge distance between the first coil and the conveyed metallic workpiece and / or a second edge distance between the second coil and the conveyed metallic workpiece at the first time; - receiving a first target edge distance for the first edge distance at the second time; and / or - receiving a second target edge distance for the second edge distance at the second time; - Determining a third correction value for the position of the first coil in the second direction taking into account the first edge distance at the first time, the determined shape and / or position data of the conveyed metallic workpiece at the first time and the first desired edge distance of the first edge distance at the second time; - Adjusting a position of the first coil in the second direction by means of the adjusting device, taking into account the third correction value, such that a first edge distance between the metallic workpiece and the first coil in the second direction is set to the first desired edge distance at the second time; and / or - Determining a fourth correction value for the position of the second coil in the second direction, taking into account the second edge distance at the first time, the determined shape and / or position data of the conveyed metallic workpiece at the first time, and the second target edge distance of the second edge distance at the second time; and / or - Adjusting a position of the second coil in the second direction by means of the adjusting device taking into account the fourth correction value such that a second edge distance between the metallic workpiece and the second coil in the second direction is set to the second desired edge distance at the second time.

[0127] The method is preferably designed such that the method comprises the following method steps: - Determining the third correction value for the position of the first coil in the second direction, taking into account the determined coil position data of the first coil and / or the determined temperature data of the conveyed metallic workpiece and / or the determined dimensional data of the conveyed metallic workpiece and / or the determined conveying speed data of the conveyed metallic workpiece and / or the target temperature of the conveyed metallic workpiece at the second time, and / or - Determining the fourth correction value for the position of the second coil in the second direction with additional consideration of the determined coil position data of the second coil and / or the determined temperature data of the conveyed metallic workpiece and / or the determined dimensional data of the conveyed metallic workpiece and / or the determined conveying speed data of the conveyed metallic workpiece and / or the target temperature of the conveyed metallic workpiece at the second point in time.

[0128] The object underlying the present invention is further achieved by a production line for the manufacture and / or processing of metallic workpieces, comprising at least one previously described induction heating device and at least one processing device for processing metallic workpieces.

[0129] Preferably, the production line comprises a plurality of previously described induction heating devices and / or processing devices for processing metallic workpieces.

[0130] The processing device for processing metallic workpieces can be or comprise, for example, a rolling device, a pressing device, a cutting device or another processing device.

[0131] The object underlying the present invention is further achieved by using a previously described induction heating device and / or a previously described method and / or a previously described production line.

[0132] Further advantages, details, and features of the invention will become apparent from the following exemplary embodiments. In detail: Fig. 1: a schematic representation of an induction heating device according to a first embodiment; Fig. 2: a schematic representation of an induction heating device according to a second embodiment; Fig. 3: a schematic representation of an induction heating device according to a third embodiment, and Fig. 4: a schematic representation of an induction heating device according to a fourth embodiment.

[0133] In the following description, identical reference numerals designate identical components or identical features, so that a description given with reference to one figure regarding a component also applies to the other figures, thus avoiding repetitive description. Furthermore, individual features described in connection with one embodiment can also be used separately in other embodiments.

[0134] Fig. 1 shows a schematic representation of an induction heating device 1 for heating metallic workpieces 2 conveyed in a conveying direction R1 according to a first embodiment. The induction heating device 1 has a first resonant circuit 10 for generating a magnetic field for heating metallic workpieces 2, wherein the first resonant circuit 10 has a first coil 11 and a first capacitor device 12 electrically connected to the first coil 11. The induction heating device 1 has a second resonant circuit 20 for generating a magnetic field for heating metallic workpieces 2, wherein the second resonant circuit 20 has a second coil 21 and a second capacitor device 22 electrically connected to the second coil 21. The first capacitor device 12 and the second capacitor device 22 have a common capacitor cabinet 90 and thus form a structural unit.The first capacitor device 12 and the second capacitor device 22 are mounted so as to be adjustable in position in a second direction R3. The first capacitor device 12 and the second capacitor device 22 have a common capacitor adjustment device 40.

[0135] The first coil 11 and the second coil 21 are each mounted so as to be positionally adjustable in a first direction R2 and in a second direction R3. The first coil 11 is positionally adjustable relative to the first capacitor device 12 and the second capacitor device 22 in the first direction R2 and in the second direction R3. The second coil 21 is positionally adjustable relative to the first capacitor device 12 and the second capacitor device 22 in the first direction R2 and in the second direction R3. Joint position adjustment is also possible.

[0136] The first coil 11 is electrically connected to the first capacitor device 12 by means of an energy transmission device 100 embodied as a cable 101, and the second coil 21 is electrically connected to the second capacitor device 22 by means of a further energy transmission device 100 embodied as a cable 101. The energy transmission devices 100 enable a change in the distance between the first coil 11 and the first capacitor device 12 or between the second coil 21 and the second capacitor device 22 in the first direction R2 and in the second direction R3. In an embodiment not shown, the energy transmission device can be designed in the form of a busbar.

[0137] The induction heating device 1 has an adjustment device 30, wherein the adjustment device 30 has two cylinder devices 31, 32, wherein a first cylinder device 31 is configured to adjust a position of the first coil 11 in the first direction R2 and a second cylinder device 32 is configured to adjust a position of the second coil 21 in the first direction R2. By adjusting a position of the first coil 11 by means of the first cylinder unit 31, a first gap width 13 between the first coil 11 and the metallic workpiece 2 is set in the first direction R2. By adjusting a position of the second coil 21 by means of the second cylinder unit 32, a second gap width 23 between the second coil 21 and the metallic workpiece 2 is set in the first direction R2.The adjustment device 30 further comprises two displacement units 33, 34, wherein a first displacement unit 33 is configured to adjust a position of the first coil 11 in the second direction R3 and a second displacement unit 34 is configured to adjust a position of the second coil 21 in the second direction R3.

[0138] Fig. Figure 2 shows a schematic representation of an induction heating device 1 for heating metallic workpieces 2 conveyed in a conveying direction R1, according to a second embodiment. The first capacitor device 12 has a capacitor cabinet 90, and the second capacitor device 22 has a separate capacitor cabinet 90. The first capacitor device 12 has a capacitor adjustment device 40, and the second capacitor device 22 has a separate capacitor adjustment device 40. The first capacitor device 12 is positionally adjustable relative to the second capacitor device 22 in the second direction R3.

[0139] Fig. Figure 3 shows a schematic representation of an induction heating device 1 for heating metallic workpieces 2 conveyed in a conveying direction R1 according to a third embodiment. The first coil 11 and the first capacitor device 12 are positively coupled with respect to movement in the second direction R3. The second coil 21 and the second capacitor device 22 are positively coupled with respect to movement in the second direction R3.

[0140] Fig.4 shows a schematic representation of an induction heating device 1 for heating metallic workpieces 2 conveyed in a conveying direction R1 according to a fourth embodiment. The induction heating device 1 has a detection device 60 for detecting shape and / or position data of the conveyed metallic workpieces 2 and a control unit 50 for controlling and / or regulating a position of the first coil 11 and the second coil 21 in the first direction R2. The control unit 50 has a setpoint receiving unit 52 for receiving setpoint gap widths for the first gap width 13 and the second gap width 23 and a calculation unit 51 for calculating correction values for the first gap width 13 and the second gap width 23.

[0141] The detection device 60 has a first sensor device 61 for detecting a geometric profile of the conveyed metallic workpieces 2 on a side of the metallic workpieces 2 facing the first coil 11, wherein a first effective range of the first sensor device 61 is arranged in front of the first coil 11 with respect to the conveying direction R1 of the metallic workpieces 2. The sensor device 61 and the detection device 60 form a structural unit.

[0142] The induction heating device 1 further comprises two temperature detection devices 80 for detecting temperatures of the conveyed metallic workpieces 2. An effective range of one temperature detection device 80 is arranged upstream of the first coil 11 and the second coil 21 relative to the conveying direction R1 of the metallic workpieces 2. An effective range of the other temperature detection device 80 is arranged downstream of the first coil 11 and the second coil 21 relative to the conveying direction R1 of the metallic workpieces 2.

[0143] The induction heating device 1 further comprises a coil position detecting device 70 for detecting coil position data of the first coil 11 and the second coil 21.

[0144] The control unit 50 is data-connected to the detection device 60, the adjustment device 30, the displacement device 40, the coil position determination device 70 and the temperature determination devices 80. List of reference symbols 1 induction heating device 2 Metallic workpiece 10 First resonant circuit 11 First coil 12 First capacitor setup 13 First gap width 20 Second resonant circuit 21 Second coil 22 Second capacitor device 23 Second gap width 30 Adjustment device 31 First cylinder device 32 Second cylinder device 33 First travel unit 34 Second travel unit 40 Capacitor adjustment device 50 control unit 51 Calculation unit 52 Setpoint receiving unit 60 detection device 61 First sensor device 70 Coil position detection device 80 Temperature detection device 90 capacitor cabinet 100 energy transmission device 101 Cables R1 conveying direction R2 First Direction R3 Second Direction

Claims

[1] Induction heating device (1) for heating metallic workpieces (2) conveyed in a conveying direction (R1), the induction heating device (1) having the following features: - the induction heating device (1) has at least one first oscillating circuit (10) for generating a magnetic field for heating metallic workpieces (2), wherein the first oscillating circuit (10) has at least one first coil (11) and a first capacitor device (12) electrically connected to the first coil (11), - the first coil (11) is mounted so as to be adjustable in position in a first direction (R2) such that a first normal distance between the first coil (11) and a workpiece (2) located in the induction heating device (1) can be changed, - the first coil (11) is mounted so as to be adjustable in position in a second direction (R3), - the induction heating device (1) has an adjusting device (30) for adjusting a position of the first coil (11) in the first direction (R2), - the induction heating device (1) has a detection device (60) for determining shape and / or position data of at least one conveyed metallic workpiece (2), - the induction heating device (1) has a control unit (50) for controlling and / or regulating a position of the first coil (11) in the first direction (R2), wherein the control unit (50) is data-connected to the detection device (60) and the adjustment device (30), - wherein the control unit (50) is configured to carry out the following method steps: - determining shape and / or position data of at least one conveyed metallic workpiece (2) at a first time by means of the detection device (60), and - Adjusting a position of the first coil (11) in the first direction (R2) by means of the adjusting device (30) taking into account the determined shape and / or position data of the at least one conveyed metallic workpiece (2) such that a first gap width (13) between the metallic workpiece (2) and the first coil (11) in the first direction (R2) is set to a desired gap width at a second time following the first time. [2] Induction heating device (1) according to claim 1, characterized by the following features: - the induction heating device (1) has a second coil (21), - the second coil (21) is mounted so as to be adjustable in position in the first direction (R2) such that a second normal distance between the second coil (21) and a workpiece (2) located in the induction heating device (1) can be changed, - the second coil (21) is mounted so as to be adjustable in position in a second direction (R3), - the adjusting device (30) is designed to adjust a position of the second coil (21) in the first direction (R2). [3] Induction heating device (1) according to claim 2, characterized by the following features: - the second coil (21) and the first capacitor device (12) are electrically connected to one another, or - the second coil (21) and a second capacitor device (22) are electrically connected to one another. [4] Induction heating device (1) according to one of the preceding claims, characterized by that the first capacitor device (12) is mounted so as to be positionally adjustable in the second direction (R3). [5] Induction heating device (1) according to one of the preceding claims, characterized bythat the first coil (11) is mounted so as to be positionally adjustable in the second direction (R3) relative to the first capacitor device (12). [6] Induction heating device (1) according to one of the preceding claims, characterized by the following features: - the first coil (11) is connected to the first capacitor device (12) by means of a flexible energy transmission device (100), and - the energy transmission device (100) enables a change in distance between the first coil (11) and the first capacitor device (12) in the first direction (R2) and / or in the second direction (R3). [7] Induction heating device (1) according to one of the preceding claims, characterized by that the first coil (11) and the first capacitor device (12) are positively coupled with respect to a movement in the second direction (R3). [8] Induction heating device (1) according to one of the preceding claims, characterized by that the control unit (50) has a setpoint receiving unit (52) for receiving setpoint gap widths for the first gap width (13) and / or the second gap width (23), and a calculation unit (51) for calculating correction values for the first gap width (13) and / or the second gap width (23), wherein the control unit (50) is configured to carry out the following method steps: - determining a first gap width (13) between the first coil (11) and the conveyed metallic workpiece (2) and / or a second gap width (23) between the second coil (21) and the conveyed metallic workpiece (2) at the first time, - receiving a first target gap width for the first gap width (13) at the second time; and / or - receiving a second target gap width for the second gap width (23) at the second time, - Determining a first correction value for the position of the first coil (11) in the first direction (R2) taking into account the first gap width (13) at the first time, the determined shape and / or position data of the conveyed metallic workpiece (2) at the first time and the first target gap width of the first gap width (13) at the second time, - adjusting a position of the first coil (11) in the first direction (R2) by means of the adjusting device (30) taking into account the first correction value such that a first gap width (13) between the metallic workpiece (2) and the first coil (11) in the first direction (R2) is set to the first desired gap width at the second time, and / or - Determining a second correction value for the position of the second coil (21) in the first direction (R2) taking into account the second gap width (23) at the first time, the determined shape and / or position data of the conveyed metallic workpiece (2) at the first time and the second target gap width of the second gap width (23) at the second time, and / or - Adjusting a position of the second coil (21) in the first direction (R2) by means of the adjusting device (30) taking into account the second correction value such that a second gap width (23) between the metallic workpiece (2) and the second coil (21) in the first direction (R2) is set to the second desired gap width at the second time. [9] Induction heating device (1) according to claim 8, characterized bythat the induction heating device (1) has a coil position determination device (70) for determining coil position data of the first coil (11) and / or the second coil (21), wherein the control unit (50) is configured to carry out the following method steps: - determining coil position data of the first coil (11) and / or the second coil (21) at the first time by means of the coil position determining device (70), - determining the first correction value for the position of the first coil (11) in the first direction (R2) with additional consideration of the determined coil position data of the first coil (11), and / or - Determining the second correction value for the position of the second coil (21) in the first direction (R2) with additional consideration of the determined coil position data of the conveyed metallic workpiece (2). [10] Induction heating device (1) according to one of claims 8 or 9, characterized by that the induction heating device (1) has a temperature detection device (80) for detecting temperatures of the conveyed metallic workpieces (2), wherein the control unit (50) is configured to carry out the following method steps: - Determining temperature data of at least one conveyed metallic workpiece (2) at the first time by means of the temperature determination device, - determining the first correction value for the position of the first coil (11) in the first direction (R2) with additional consideration of the determined temperature data of the conveyed metallic workpiece (2), and / or - Determining the second correction value for the position of the second coil (21) in the first direction (R2) with additional consideration of the determined temperature data of the conveyed metallic workpiece (2). [11] Method for operating an induction heating device (1) for heating metallic workpieces (2) by means of an induction heating device (1) according to one of claims 1 to 10, comprising the following method steps: - determining shape and / or position data of at least one conveyed metallic workpiece (2) at a first time by means of the detection device (60), and - Adjusting a position of the first coil (11) in the first direction (R2) by means of the adjusting device (30) taking into account the determined shape and / or position data of the at least one conveyed metallic workpiece (2) such that a first gap width (13) between the metallic workpiece (2) and the first coil (11) in the first direction (R2) is set to a desired gap width at a second time following the first time, and / or - Adjusting a position of the second coil (21) in the first direction (R2) by means of the adjusting device (30) taking into account the determined shape and / or position data of the at least one conveyed metallic workpiece (2) such that a second gap width (23) between the metallic workpiece (2) and the second coil (21) in the first direction (R2) is set to a desired gap width at a second time following the first time. [12] Method for operating an induction heating device (1) for heating metallic workpieces (2) according to claim 11 by means of an induction heating device (1), wherein the control unit (50) has a setpoint receiving unit (52) for receiving setpoint gap widths for the first gap width (13) and / or for the second gap width (23), and a calculation unit (51) for calculating correction values for the first gap width (13) and / or the second gap width (23), characterized by the following procedural steps: - determining a first gap width (13) between the first coil (11) and the conveyed metallic workpiece (2) and / or a second gap width (23) between the second coil (21) and the conveyed metallic workpiece (2) at the first time, - receiving a first target gap width for the first gap width (13) at the second time, and / or - receiving a second target gap width for the second gap width (23) at the second time, - Determining a first correction value for the position of the first coil (11) in the first direction (R2) taking into account the first gap width (13) at the first time, the determined shape and / or position data of the conveyed metallic workpiece (2) at the first time and the first target gap width of the first gap width (13) at the second time, - adjusting a position of the first coil (11) in the first direction (R2) by means of the adjusting device (30) taking into account the first correction value such that a first gap width (13) between the metallic workpiece (2) and the first coil (11) in the first direction (R2) is set to the first desired gap width at the second time, and / or - Determining a second correction value for the position of the second coil (21) in the first direction (R2) taking into account the second gap width (23) at the first time, the determined shape and / or position data of the conveyed metallic workpiece (2) at the first time and the second target gap width of the second gap width (23) at the second time, and / or - Adjusting a position of the second coil (21) in the first direction (R2) by means of the adjusting device (30) taking into account the second correction value such that a second gap width (23) between the metallic workpiece (2) and the second coil (21) in the first direction (R2) is set to the second desired gap width at the second time. [13] Production line for the manufacture and / or processing of metallic workpieces (2), comprising at least one induction heating device (1) according to one of claims 1 to 10 and at least one processing device for processing metallic workpieces (2). [14] Use of an induction heating device (1) according to one of claims 1 to 10 and / or a method according to one of claims 11 or 12 and / or a production line according to claim 13.

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