METHOD AND DEVICE FOR WINDING A METAL STRIP AND USE OF A CONTACT ROLLER

Description

[0001] The invention relates to a method for winding a metal strip, in which a metal strip is provided, in which the metal strip is fed to a winding roll via contact with at least one contact roller and in which the metal strip is wound on the winding roll and the temperature of the metal strip at which the metal strip is wound on the winding roll is at least partially adjusted by tempering the at least one contact roller.The invention further relates to a device for winding a metal strip for carrying out a method according to the invention, comprising at least one contact roller and at least one winding roll for winding the metal strip. The at least one contact roller is configured to feed the metal strip to the winding roll via contact with the at least one contact roller, and the at least one contact roller has temperature control means for adjusting the temperature of the metal strip at which the metal strip is wound onto the winding roll. A use of a contact roller is also disclosed.

[0002] Metal strips, especially metal foils made of aluminum or aluminum alloys, can be produced by first casting a rolling ingot, hot-rolling the ingot into a hot strip, and then cold-rolling the hot strip, with or without intermediate annealing, to the final thickness of the foil. The rolling ingot can optionally be subjected to heat treatment or homogenization before the hot rolling process. Alternatively, it is possible to cast a metal strip directly (continuous casting) and then form it to a final thickness using hot and / or cold rolling.

[0003] For further processing or delivery of a metal strip, the metal strip is typically wound onto a winding reel and formed into a wound body or coil. In the large-scale production of metal strip, such as (cold) rolling, high process speeds are typically desired. High rolling ratios or pass reductions are often required during cold rolling, which result in a corresponding increase in the exit speed of the metal strip from the work rolls. The speed for winding a metal strip must therefore be comparatively high in order not to reduce the productivity of the metal strip production.

[0004] DE 10 2008 037 520 B4 proposes a winding device with a contact roller to enable high film web speeds during winding. A metal foil web can be fed to a winding roll by wrapping around the contact roller. This is intended to prevent, in particular, air cushions between the individual film layers and unwanted telescoping of the winding body.

[0005] However, particularly with thin metal strips or metal foils, problems continue to arise with the quality of the wound strips or foils and their arrangement in the winding body. On the one hand, so-called neckings can occur in metal strips, which are usually formed by circumferential, single or multiple folds. Such neckings can lead to rope folds, stranding, and / or gramophone grooves during further winding. On the other hand, tension differences can arise in the metal foil during winding, so that although winding occurs with a certain specified flatness, the subsequently unwound metal strip deviates from the flatness specifications. Such phenomena and defects in the shape of the metal strips must be subsequently removed or even lead to the rejection of the affected metal strip.

[0006] In the case of aluminum alloy metal strips, the microstructure of the metal strip is also adjusted during production under the influence of thermal and mechanical processing steps, which determines the mechanical properties of the metal strip. Here, too, undesirable deviations are observed between the properties of the metal strip during winding and the subsequent properties upon unwinding from the winding body.

[0007] Another problem with rolled metal strips is the removal of surface deposits on the metal strip that arise during rolling, for example surface deposits from lubricants such as rolling oil residues, rolling emulsion residues or deposits of other contaminants such as metal particles.

[0008] From DE 87 17 259 U1, which forms the basis for the preamble of claim 1, a winding machine for metal foils is known, comprising a cylinder against which a winding roll is supported. The cylinder serves to displace air from the gap between the foil and the winding roll and is provided with an elastic coating. In the exemplary embodiments, the cylinder is designed either as a support drum for a reel, as a winding roll, or as a support roller with pressure rollers, or as a support roller of a double support roller winder. The coating can further have a perforated surface, with air being drawn through the perforation to achieve cooling of the coating.

[0009] DE 36 27 463 A1 relates to a device for regulating the pressure of a contact roller on a coil. A positioning device and a position-measuring device for the contact roller are provided, with a computer specifying the positioning of the contact roller according to a function depending on the coil diameter. This is intended to achieve a uniform winding density in the coil, in particular to prevent wrinkling, out-of-roundness, and telescoping. The contact roller can be designed as a cooling roller.

[0010] Japanese patent JP 4277344 B2, on the other hand, deals with straightening devices that contribute to improving the flatness of the strip through temperature-controlled tension rollers. The problem of the temperature gradient of the metal strip during winding was not recognized.

[0011] The international patent application WO 2009 / 093806 A2 relates to a tempered roller for adjusting a roll barrel of the roller.

[0012] The present invention is based on the object of proposing a method and a device for winding a metal strip, wherein the properties of the metal strip can be adjusted as reliably as possible at high winding speeds, also with regard to the resulting properties after subsequent unwinding of the metal strip. Furthermore, an advantageous use of a contact roller for achieving this object is to be specified.

[0013] The stated object is achieved by a method according to claim 1, a device according to claim 9 and a use according to claim 15.

[0014] It was recognized that a significant change in the temperature of the metal strip can be achieved by controlling the temperature of the contact roller(s) during winding. By adjusting the temperature of the metal strip at the point of contact with the contact roller, wrinkling and tension differences in the metal strip can be reduced or compensated for during the winding process through targeted control of the temperature of the contact roller. Likewise, the mechanical properties of the metal strip can be better controlled in its final state, for example after subsequent unwinding. Adjusting the temperature of the metal strip by controlling the temperature of the contact roller also allows for greater flexibility when using cooling lubricants during a preceding rolling process, so that the metal strip can have less surface deposits and is easier to clean.

[0015] The term metal strip is intended to include, in particular, thinner strips such as foils which comprise metallic materials. In particular, the metal strip comprises or consists of aluminum or an aluminum alloy. The provision of a metal strip can, for example, comprise cold rolling and / or hot rolling. The provision can include casting, for example into a rolling ingot or continuous casting into a strip, and optionally homogenization. One or more intermediate annealing steps and / or final annealing of the metal strip can be provided. It is also conceivable for the metal strip to be provided by unwinding from a winding body. When provided for winding, in particular after cold rolling, the metal strip can have a temperature of more than 40°C, in particular more than 100°C.Such temperatures can occur during cold rolling at high speeds and / or rolling degrees.

[0016] By winding the metal strip onto the winding reel, a winding body, or coil, is formed. The layers of metal strip in the winding body are preferably in contact with each other, at least in some areas, resulting in a particularly compact winding body.

[0017] The temperature of the metal strip during winding also determines the temperature profile within the winding body. It has been recognized that higher temperatures during winding, in particular, can lead to unfavorable temperature profiles within the winding body. The cooling of the winding body during and after winding can be particularly uneven, with the outer layers of the metal strip cooling faster than the inner layers close to the take-up roll. Therefore, the temperature and cooling rate of the metal strip can already be dependent on the longitudinal direction of the metal strip in the winding body. Areas at the edges of the metal strip can also cool faster than areas in the middle of the metal strip in the transverse direction, resulting in a dependence of the temperature and cooling rate in the transverse direction of the metal strip. Corresponding unevenness in the temperature profile orCooling can be the cause of wrinkling and / or tension differences.

[0018] Because the temperature of the metal strip at which the metal strip is wound onto the winding roll is adjusted at least partially by controlling the temperature of at least one contact roller, wherein the metal strip is fed to a winding roll via contact with the at least one contact roller, the method according to the invention allows a particularly effective adjustment of the winding temperature of the metal strip. The temperature of the metal strip at which the metal strip is wound onto the winding roll can be both reduced and increased. Adjusting the temperature of the metal strip at which the metal strip is wound onto the winding roll by controlling the temperature of the at least one contact roller is understood in particular to mean that the temperature of the contact roller is adjusted in order to bring about heat transfer in the metal strip through contact with the contact roller and thus a targeted temperature change in the metal strip.

[0019] Accordingly, the temperature range at which the metal strip is wound can be selected by controlling the temperature of the contact roller. For example, the contact roller is temperature-controlled such that the temperature of the metal strip during winding is less than 100°C, in particular less than 70°C or less than 50°C. In particular, the temperature of the metal strip during winding can be less than 40°C. Low winding temperatures or winding temperatures close to room temperature reduce the risk of wrinkling and undesirable stress distributions within the winding body. The process can also influence the otherwise uncontrolled recovery and recrystallization processes in the metal strip, such as those that occur with aluminum alloys, for example.It is also conceivable to increase the winding temperature of the metal strip, for example so that the metal strip in the winding body undergoes a thermal treatment (e.g. corresponding to a final annealing).

[0020] In particular, the at least one contact roller is wrapped around the metal strip, allowing the metal strip to come into contact with the contact roller not only along a line but also across its surface. This facilitates heat transfer between the metal strip and the contact roller, thus improving temperature adjustment. In particular, the metal strip is in circumferential contact with the contact roller over an angular range of at least 90°, in particular of at least 180° (i.e., the metal strip rests on at least one-third or at least one-half of the circumference of the contact roller at at least one axial position of the contact roller).

[0021] In particular, the contact roller and metal strip are in contact with each other at the winding point, i.e., during winding, the metal strip is applied and / or pressed against the winding roll or winding body by the contact roller. The winding point is understood to be the point in a plane perpendicular to the longitudinal direction of the contact roller at which the (not yet wound) metal strip is guided onto the winding body. Accordingly, winding via the contact roller not only allows for particularly reliable processing at high speeds, but also allows for more effective heat transfer between the metal strip and the contact roller. In particular, the contact roller can also function as a smoothing roller for the winding process.

[0022] In one embodiment of the process, the metal strip can be cleaned before, during, and / or after winding. Surface deposits on the metal strip, for example, lubricants such as rolling oil residues, rolling emulsion residues, or deposits of other contaminants such as metal particles, can be removed. Chemical, thermal, and / or mechanical treatments can be used, for example, by brushing and / or degreasing.

[0023] In principle, several rollers can be provided in a roller arrangement, with at least the at least one contact roller and, for example, all rollers of the roller arrangement being temperature-controlled. In a preferred embodiment of the method, the metal strip is fed to the winding roll via a roller arrangement, with the roller arrangement comprising the at least one contact roller. In particular, a pair of rollers (which comprises the contact roller) is provided, with both rollers of the roller pair preferably being temperature-controlled jointly or independently of one another. The metal strip is preferably in contact with the rollers of the roller arrangement on both sides, i.e. at least one roller is in contact with the surface of the metal strip (the surface of the metal strip with the greatest extent). The metal strip can be guided through the roller arrangement in an S-shaped path, which can create flat, double-sided contact.In particular, the rollers of the roller arrangement are arranged so that the gap between the rollers is of the same order of magnitude as the thickness of the metal strip.

[0024] The rollers of the roller arrangement can have the same diameter, for example, from 300 mm to 600 mm. Likewise, the angular ranges in which the metal strip is in circumferential contact with the respective roller can be the same, in particular with an angular range of at least 90°, in particular of at least 180° or approximately 180°. The axes of the rollers of the roller arrangement and the winding roller can be arranged in one plane and in particular approximately parallel to each other.

[0025] The advantage of using a pair of rollers or a roller arrangement is that the rollers are in contact with the metal strip on both sides. This allows for particularly effective temperature control. The temperature profile along the thickness of the metal strip can be influenced; for example, both sides of the metal strip are heated to the same temperature, enabling a particularly homogeneous temperature profile along the thickness of the metal strip during winding.

[0026] In one embodiment of the method, a tensile separation can be effected between a rolling stand and the winding roll for the metal strip via the roller arrangement. When the strip is prepared, the strip runs out of the rolling stand, in particular under tension, and the strip can then be relaxed by adjusting the roller arrangement and, in particular, in an S-shaped course of the strip during winding. This can eliminate the need for a separate work step for relaxing the strip. Tensile separation can be understood to mean that the tension on the metal strip as it runs out of the rolling stand is reduced by 10% to 75%, in particular by 30% to 55%, for winding over the winding roll. The tension during winding via the tensile separation can be selected depending on the material properties of the metal strip, for example, depending on the yield stress of the metal strip.

[0027] In a further embodiment, a contact pressure profile of the metal strip during winding is adjusted via the relative arrangement of the at least one contact roller and the winding roller. As already described above, the contact roller and metal strip can be in contact with one another at a winding point on the winding roller, i.e. in particular, the metal strip is pressed against the winding roller or winding body by the contact roller during winding. The pressure between the winding roller and the contact roller can be adjusted, with a defined pressure being exerted on the metal strip along at least one line, for example in the transverse direction of the metal strip. By adjusting the pressure, in particular the heat transfer between the contact roller and the metal strip and the winding can be influenced.

[0028] A contact pressure profile can also be set here, i.e. a specific value for the pressure can be set, for example, depending on the position along the transverse direction of the metal strip. For example, a constant pressure can be set for all positions along the transverse direction of the metal strip. Alternatively, the pressure profile can be designed such that the pressure varies along the transverse direction of the strip. This can be advantageous with thickness variations in the metal strip, for example a metal strip with a pronounced thickness profile (crown). The temperature profile in the transverse direction of the metal strip can also be influenced at least partially via the contact pressure profile. For example, the contact roller can be clamped and, for example, the crown of the contact roller can be changed, in particular to adjust the contact pressure profile.

[0029] According to the invention, the relative arrangement of the at least one contact roller and winding roller can be varied via a linear guide for the winding roller. In addition, a linear guide for the contact roller can be provided, for example. A linear guide can provide a high level of precision. For example, the position of the winding point of the metal strip is independent of the respective diameter of the winding body, which can be achieved by moving the winding roller. Cumulatively, the contact roller can be movable relative to the winding roller. If a roller arrangement comprising the contact roller is used, the rollers of the roller arrangement can also be designed to be movable together and / or relative to one another, for example, to influence the contact of the metal strip with the contact rollers when a pair of contact rollers is wrapped in an S shape.The winding roller, contact roller(s) and / or roller arrangement can be moved by hydraulic and / or pneumatic means, for example hydraulic, pneumatic and / or hydropneumatic means or corresponding cylinders.

[0030] In a further embodiment, the temperature of the metal strip during contact with the at least one contact roller can be adjusted at least partially using liquid and / or gaseous heat transfer media. For example, liquid and / or gaseous heat transfer media are applied to the metal strip before and / or during contact with the at least one contact roller. Heat transfer media can be applied to the contact roller, a roller arrangement, and / or directly to the metal strip.

[0031] The heat transfer media can be preheated or precooled, thus adjusting the winding temperature, with the heat transfer media themselves either inputting or absorbing heat. The heat transfer media can further improve heat transfer between the contact roller(s) and the metal strip, thus improving the winding temperature, for example, by increasing the thermal contact or by ensuring high thermal conductivity of the heat transfer media.

[0032] Preferably, the heat transfer media are inert. Inert here can mean that the heat transfer media do not enter into any significant (chemical) reaction with the strip and / or the rolls and, for example, do not impair the effectiveness of (rolling) lubricants. An example of this is polyglycol, which is beneficial for heat transfer and does not impair a rolling lubricant such as rolling oil during a rolling process.

[0033] The heat transfer media can be compatible with other media used in the process. "Compatible" can mean that the heat transfer media are compatible with other media used in the process, such as lubricants from the rolling process and / or subsequent processes, and, for example, that they do not trigger any adverse reactions with these other media for the strip, the other media, and / or the rolls.

[0034] The rolling lubricant, e.g., a rolling oil, can itself serve as a heat transfer medium. Heat transfer media can also be a compatible (e.g., a polyglycol compatible in the above sense) and / or an inert heat transfer medium in the above sense. Examples include air, nitrogen, liquids, and CO2, especially supercritical CO2.

[0035] For example, heat transfer media are applied in conjunction with a preceding rolling process, eliminating the need for an additional application step. For example, heat transfer media can be applied together with rolling lubricants prior to a rolling process, and / or the rolling lubricant (e.g., a rolling oil) itself serves as the heat transfer medium. For example, heat transfer media are applied at the inlet of the rolling stand and / or via the work rolls of the rolling stand. Preferably, a compatible heat transfer medium is used, such as a polyglycol, which does not impair the rolling lubricant, such as the rolling oil, and is also not evaporated during the rolling process.

[0036] Heat transfer media can be applied after a rolling process, for example, at the exit of the metal strip from the rolling stand. This is particularly advantageous for inert heat transfer media that may be volatilized during the rolling process. Examples of such inert heat transfer media include air, nitrogen, liquids, and CO2, especially supercritical CO2.

[0037] In a further embodiment, a temperature profile of the metal strip can be set in the transverse direction of the metal strip. The metal strip is in contact with the longitudinal direction of the contact roller in the transverse direction. For example, tempering zones can be provided in the longitudinal direction of the contact roller, it being possible for the contact roller to be tempered at least partially independently of one another in the longitudinal direction in these tempering zones. The metal strip can have a temperature profile in the transverse direction, i.e. the temperature depends on the position in the transverse direction. For example, a uniform temperature profile can be set, i.e. an approximately identical temperature at the positions along the transverse direction. An uneven temperature profile is also possible, for example the areas at the edges of the metal strip are set to a higher temperature than the areas close to the middle.

[0038] In a further embodiment, a temperature profile of the metal strip is set in the longitudinal direction of the metal strip. The metal strip can have a temperature profile in the longitudinal direction, i.e. the temperature is dependent on the position in the longitudinal direction. For example, a uniform temperature profile can be set, i.e. an approximately identical temperature at the positions along the longitudinal direction. An uneven temperature profile is also possible, for example the areas of the metal strip at the beginning, which are wound up first, are set to a lower temperature than the areas near the end of the metal strip, which are wound up last. Such an adjustment can be brought about in particular by a time-dependent temperature control of the contact roller(s).

[0039] Consequently, a temperature profile can also be adjusted within the winding body. As already described above, at least some of the defects on the winding bodies are attributed to the temperature distribution within the winding body, which causes, for example, voltage differences and uneven shrinkage of the winding body during cooling. If a temperature profile of the metal strip is adjusted longitudinally, such phenomena can at least be mitigated or even used to influence the structure of the metal strip.

[0040] If the temperature profile of the metal strip is set to be as homogeneous as possible in the transverse and / or longitudinal directions, the maximum temperature difference of the metal strip at different positions in the transverse and / or longitudinal directions (each) can be less than 10 °C, in particular less than 5 °C. This can prevent larger voltage differences and uneven shrinkage of the winding body.

[0041] According to the invention, the temperature of the metal strip is measured before, during and / or after contact with the contact roller. In a preferred embodiment, the temperature of the metal strip is measured before and after contact with the contact roller and, in particular, a difference in temperature before and after contact is determined. This allows the influence of the temperature control of the contact roller(s) on the temperature of the metal strip to be monitored with high precision. Several temperature measurements can also be taken along the transverse direction of the metal strip in order to determine a temperature profile in the transverse direction of the metal strip. The temperature at the winding point is also measured, in particular. Pyrometers and / or thermocouples (e.g. in the contact roller), for example, are used to measure the temperature.

[0042] The temperature measurement can be used, in particular, to create a (closed) control loop for controlling the temperature of the contact roller(s). For example, at least one output variable is determined, at least partially depending on the temperature(s) of the metal strip. The temperature control of the contact roller(s) can be carried out, at least partially, depending on the at least one output variable. For example, the at least one output variable is determined by a control unit and outputted, or an output is initiated. The at least one output variable is, in particular, indicative of the temperature control of the contact roller(s) and allows control of the temperature control.

[0043] To regulate the temperature, profiles can also be stored which, for example, influence the temperature control of the contact roller(s). For example, already known output variables for certain process parameters (e.g. width, length of the metal strip, material of the metal strip, rolling degree(s), forces, moments, strip tension, coolant quantity / type, control parameters and / or feedforward control) are stored in a database and can be called up to control the temperature control of the contact roller(s). Corresponding profiles can also be used in connection with the previously described determination of at least one output variable. For example, the at least one output variable is influenced by both measured values ​​(e.g. temperature(s) of the metal strip) and by at least one stored profile.

[0044] The method allows a metal strip or metal foil to be wound in a single layer. However, in a further embodiment, a metal strip is provided in multiple layers, in particular a double layer.

[0045] In particular, thinner foils are often rolled as double foil during cold rolling, i.e. two layers of a foil are placed on top of one another and guided together through the rolling stand. It has been found that metal strips in multiple layers can also be wound reliably using the method according to the invention, wherein, in particular, adjustment of the temperature of such multiple layers is also possible. In particular, a roller arrangement with a contact roller is used to contact the metal strip on both sides, whereby the individual layers of the metal strip are each in contact with the temperature-controlled rollers. In particular, a pair of rollers is used in conjunction with two layers of a metal strip, whereby the temperature of each layer of the metal strip can be adjusted (if necessary independently of one another). For example, the temperatures of the layers are adjusted uniformly, i.e.with a temperature difference between the layers of less than 10 °C, in particular less than 5 °C.

[0046] The metal strip comprises, in particular, or consists of, an aluminum alloy. For example, aluminum alloys of types AA8XXX, in particular AA8006, AA8011, AA8111, AA8014, AA8015, AA8021, and AA8079, are used. Alloys of type AA1XXX can also be used.

[0047] The speed of the metal strip during provision and winding, for example after rolling, can be 100 m / min - 3000 m / min. The thickness of the metal strip is in particular less than 1.0 mm or less than 0.15 mm. Metal foils with thicknesses of 5 µm to 200 µm are preferably used as metal strips. In particular, metal strips or metal foils with thicknesses of at most 70 µm, at most 35 µm, or at most 20 µm are used. In principle, a pre-rolled strip for foils can also be wound up, which, for example, has a thickness of up to a maximum of 500 µm. If a foil with a final thickness is wound up, the thickness can be 5 µm to 12 µm, in particular 5 µm to 6 µm.

[0048] According to the invention, the above-mentioned object relating to a device for winding a metal strip, in particular for carrying out the method according to the invention, is achieved with a device according to claim 9.

[0049] As already explained with regard to the method according to the invention, it has been recognized that a significant change in the temperature of a metal strip can be achieved by controlling the temperature of the contact roller(s) during winding. By specifically controlling the temperature of the contact roller(s), wrinkling phenomena and tension differences in the metal strip can be reduced or compensated for during winding. The mechanical properties of the metal strip can also be adjusted using the device.

[0050] In principle, the temperature of the contact roller can be controlled using heating means and / or cooling means. For example, the contact roller has one or more electrical heating elements and / or lines for a heating medium and / or a cooling medium. For example, an inert gas or liquefied inert gas is provided. Media based on nitrogen, air, CO2 (particularly supercritical or liquid), or water can be provided for cooling and / or heating, for example. Rolling lubricants, e.g., rolling oil, and / or polyglycols, which have inert properties and / or can be compatible with the lubricant used for rolling, for example, if rolling is planned in the subsequent process. In the event of leaks in the heating and / or cooling medium used to control the temperature of the contact roller, the risk of impairment or damage to the subsequent process and the final product is reduced.

[0051] The device can comprise means for providing a metal strip, for example means for cold rolling and / or hot rolling (e.g. one or more rolling stands, for example tandem rolling stands). The device can be part of a rolling train for producing a metal strip. The winding device is in particular arranged directly downstream of a means for cold rolling. Means for casting, thermally and / or mechanically treating a metal strip can be provided. It is also conceivable for the metal strip to be provided by an unwinding device. Means for cleaning the metal strip can be provided, for example brushes. The device can have a strip pulling device, for example comprising two rollers which feed the metal strip to the contact rollers (for example a pair of S-rollers).

[0052] The contact roller(s) can have a diameter of 300 mm to 600 mm. Corresponding contact roller sizes allow for reliable winding and good heat transfer between the metal strip and the contact roller(s).

[0053] In one embodiment of the device, a roller arrangement is provided which is designed to contact a metal strip on both sides and feed it to the winding roll. The roller arrangement comprises at least one contact roller. Accordingly, the temperature can be adjusted on both sides of the metal strip. The contact roller configurations described here can also be used for configurations of the other roller(s) of the roller arrangement.

[0054] In a further embodiment of the device, means are provided for adjusting the contact pressure profile of a metal strip during winding onto the winding roll. For example, the winding roll and / or contact roller(s) are assigned to a linear guide that can change the relative arrangement of the winding roll and / or contact roller(s). The means for adjusting the contact pressure profile can be used, for example, to ensure constant pressure of the contact roller(s) on the winding body and for optimal winding conditions. The winding roll, contact roller, and / or roller arrangement can be movable via hydraulic and / or pneumatic means, for example hydraulic, pneumatic, and / or hydropneumatic means or corresponding cylinders. The means for adjusting the contact pressure profile can also include means for damping vibrations.

[0055] A contact pressure profile can be adjusted by bracing the contact roller. In a further embodiment of the device, means are provided for adjusting the crowning of the contact roller(s). For example, the contact roller has at least one channel for a pressure medium, wherein a (reversible) deformation of the contact roller can be brought about by adjusting the pressure of the pressure medium. The crowning of the contact roller can be adjusted accordingly, i.e. a targeted deviation of the shape of the contact surface of the contact roller from a cylindrical shape. The contact roller can have several regions in the longitudinal direction with respective channels for pressure medium. Several channels for pressure medium can also be provided in the circumferential direction.

[0056] In a further embodiment of the device, the at least one contact roller has at least two tempering zones in the axial direction, which are particularly designed to be tempered independently of one another. For example, this can be used to adjust the temperature profile of a metal strip in contact with the contact roller in the transverse direction of the metal strip. For example, the contact roller has several electrical heating elements and / or several lines for heating media and / or cooling media distributed in the longitudinal direction. In particular, at least one temperature measuring element, for example at least one thermocouple, is also provided for each tempering zone.

[0057] In a further embodiment of the device, the contact roller has a coating, particularly for heat conduction and / or damping. The coating can have a higher or lower thermal conductivity compared to the surface of the uncoated contact roller.

[0058] According to the invention, the above-mentioned object is also achieved by using a contact roller in the method according to the invention. Regarding the advantages and embodiments of the use, reference is made to the description of the method according to the invention and the device according to the invention.

[0059] In particular, the preceding or following description of method steps according to preferred embodiments of a method is intended to also disclose corresponding means for carrying out the method steps by preferred embodiments of a device. Likewise, the disclosure of means of a device for carrying out a method step is intended to also disclose the corresponding method step.

[0060] Further advantageous exemplary embodiments of the invention can be found in the following detailed description of some exemplary embodiments of the present invention, particularly in conjunction with the figures. In the drawings: Fig. 1 shows a first embodiment of a method or a device according to the invention and Fig. 2 shows a second embodiment of a method or a device according to the invention.

[0061] In Fig. 1 1 shows a device 2 or a method for winding a metal strip 4. A rolling stand 8 is shown, which, for example, provides the metal strip via cold rolling. The rolling stand 8 does not necessarily have to represent a part of the device 2 or a means of the method for winding a metal strip 4. In this exemplary embodiment, the metal strip 4 is, for example, a metal foil made of an aluminum alloy, which has a thickness of up to 200 µm, in particular of at most 50 µm, at most 35 µm, at most 20 µm. However, the device 2 can also be designed for metal strips made of other materials and / or with other thicknesses.

[0062] The metal strip 4 leaves the rolling stand at a comparatively high speed, approximately between 100 m / min and 3000 m / min, and at a temperature increased by cold rolling to more than 40 °C, in particular more than 100 °C, and is to be coiled. Advantageously, the metal strip 4 should be coiled without significant wrinkling or tension differences occurring in the metal strip, and the mechanical properties of the metal strip in the final state can be reliably adjusted.

[0063] The metal strip 4 is fed to a winding roll 14 via contact with a contact roller 12, and the metal strip 4 is wound onto the winding roll 14 to form a winding body 16. The contact roller 12 is arranged here in a roller arrangement 11 with another roller 10 as a pair of rollers,

[0064] It has been recognized that by tempering the contact roller 12 (if necessary with simultaneous tempering of roller 10) during winding, a significant change in the temperature of the metal strip 4 can be achieved, whereby, in particular, wrinkling phenomena and tension differences in the metal strip 4 can be reduced or compensated for during winding. The temperature distribution in the winding body 16 can be advantageously influenced, whereby, for example, tension differences and uneven shrinkage of the winding body 16 during cooling are reduced. By using a pair of rollers in a roller arrangement 11, the metal strip 4, and thus the respective layer of the double foil, can be brought into contact with a tempered roller on both sides.

[0065] The temperature of the metal strip 4, at which the metal strip 4 is wound onto the winding roll 14, is adjusted at least partially by controlling the temperature of the contact roller 12. The rollers 10, 12 can have one or more electrical heating elements and / or lines for a cooling medium. The metal strip 4 is wrapped around the rollers 10, 12, here with an S-shaped wrap, wherein the metal strip 4 is in circumferential contact with the rollers 10, 12 over an angular range of at least 90°, in particular of at least 180°, in order to effect effective heat transfer. The rollers 10, 12 have a coating for heat conduction and damping.

[0066] Contact roller 12 and metal strip 4 are in contact with each other at the winding point 18. The relative arrangement of roller assembly 11 and winding roller 14 can be used to adjust the contact pressure profile of the metal strip 4 during winding. A linear guide for the winding roller 14, symbolized by the arrow 20, is provided, whereby winding can be carried out in such a way that the position of the winding point 18 of the metal strip 4 is independent of the respective diameter of the winding body 16, as indicated by the outline of the winding body 16' at the end of the winding process. The roller assembly 11 causes a tension separation of the metal strip 4, whereby the tension acting on the metal strip 4 as it exits the rolling stand 8 is reduced by 10% to 75% for winding.

[0067] A contact pressure profile can be adjusted, with a specific pressure value being set depending on the position along the transverse direction of the metal strip 4. For this purpose, the crowning of the contact roller 12 is also adjustable.

[0068] A temperature profile of the metal strip 4 in the transverse and longitudinal directions of the metal strip 4 is set. During winding, the temperature of the metal strip 4 is less than 100°C, in particular less than 70°C, in particular less than 50°C or less than 40°C. The maximum temperature difference of the metal strip at various positions in the transverse and longitudinal directions can be, in particular, less than 10°C or less than 5°C.

[0069] The temperature of the metal strip 4 is measured by pyrometers 22, 24 before and after contact with the roller assembly 11. A (closed) control loop for controlling the temperature of the rollers 10, 12 can be provided.

[0070] A rolling lubricant is applied in front of the rolling stand 8 via a lubricating device 30. The rolling lubricant can serve as a heat transfer medium for contact with the rolls 10, 12, with heat transfer agents compatible with the lubricant, particularly polyglycols, additionally being added to the rolling lubricant.

[0071] Further shown in Fig. 1 a strip pulling device comprising two rollers 26, 28, which feed the metal strip 4 to the contact rollers 10, 12.

[0072] Fig.2 shows a second embodiment of a device 2, wherein corresponding elements have the same reference numerals as in Fig. 1 The embodiment of the device 2 in Fig. 2 essentially corresponds to the embodiment of the Fig. 1, however, the position of the winding roller 14 is fixed and the contact roller 12 and the roller arrangement 11 are movable. Here, the contact roller 12 and the metal strip 4 are also in contact with one another at the winding point 18, wherein the contact pressure profile of the metal strip 4 during winding is adjusted via the relative arrangement of the roller arrangement 11 and the winding roller 14. A linear guide, symbolized by the arrow 20, of the contact roller 12 and the roller arrangement 11 is provided, wherein the winding can be carried out in such a way that the radius of the winding body 16, which increases with winding, is compensated by moving the contact roller 12 and the roller arrangement 11.

Claims

1. Method for winding a metal strip(4), in which a metal strip(4) is provided, in which the metal strip(4) is fed to a winding roller (14) via contact with at least one contact roller (12), and in which the metal strip(4) is wound onto the winding roll (14) to form a winding body or a coil, and the temperature of the metal strip (4), at which the metal strip (4) is wound onto the winding roller (14), is set at least partially by controlling the temperature of the at least one contact roller (12) characterised in that a temperature profile is set in the winding body, the temperature of the metal strip (4) being measured before, during and / or after contact with the at least one contact roller (12) .

2. Method according to claim 1, characterised in that the metal strip is fed to the winding roller (14) via a roller arrangement (11), wherein the roller arrangement (11) comprises the at least one contact roller (12) and wherein the metal strip (4) is guided through the roller arrangement (11), in particular in a S-shaped course.

3. Method according to claim 2, characterised in that a tension separation between a roll stand and the winding roll (14) for the metal strip (4) is effected via the roll arrangement (11).

4. Method according to any one of claims 1 to 3, characterised in that the relative arrangement of the at least one contact roller (12) and the winding roller (14) is used to set a contact pressure curve of the metal strip (4) during winding.

5. Method according to any one of claims 1 to 4, characterised in that the temperature of the metal strip (4) on contact with the at least one contact roller (12) is at least partially adjusted via liquid and / or gaseous heat transport media.

6. Method according to any one of claims 1 to 5, characterised in that a temperature profile of the metal strip (4) is set in the transverse direction of the metal strip (4).

7. Method according to any one of claims 1 to 6, characterised in that a temperature profile of the metal strip (4) is set in the longitudinal direction of the metal strip (4).

8. Method according to any one of claims 1 to 7, characterised in that a metal strip (4) is provided as a multiple layer, in particular as a double layer.

9. Device(2) for winding a metal strip (4) for carrying out a method according to any one of claims 1 to 8, with at least onecontact roller (10, 12) and with at least one winding roller(14) for winding the metal strip (4), wherein theat least one contact roller (12) is configured in that the metal strip (4) is fed to the winding roll (14) via contact with the at least one contact roller (12) and the at least one contact roller (12) has temperature control means for adjusting the temperature of the metal strip (4), with which the metal strip (4) is wound onto the winding roll (14), characterised in that the device is configured in that a temperature profile is set in the winding body and, the temperature of the metal strip (4) being measured before, during and / or after contact with the at least one contact roll (12).

10. Device(2) according to claim 9, characterised in that a roller arrangement (11) is provided, which is configured in that a metal strip (4) is contacted on both sides and fed to the winding roller (14), the roller arrangement (11) comprising the at least one contact roller (12).

11. Device according to claim 9 or 10, characterised in that means are provided for adjusting the contact pressure curve of a metal strip (4) during winding on the winding reel (14).

12. Device according to any one of claims 9 to 11, characterised in that means are provided for adjusting the crowning of the at least one contact roller (12).

13. Device (2) according to any one of claims 9 to 12, characterised in that the at least one contact roller (12) has at least two temperature control zones in the axial direction, which are set up to adjust a temperature profile of a metal strip (4) in contact with the at least one contact roller (12) in the transverse direction of the metal strip (4).

14. Device (2) according to any one of claims 9 to 13, characterised in that the at least one contact roller (12) has a coating, in particular for heat conduction and / or damping.

15. Use of a contact roller (12) in a method according to claim 1, which comprises tempering means for adjusting the temperature of a metal strip (4) which is in contact with the contact roller (12), in a device (2) for winding a metal strip (4).