Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/16—Controlling or regulating processes or operations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
  • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
  • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B15/0007—Cutting or shearing the product
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/12—Accessories for subsequent treating or working cast stock in situ
  • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/16—Controlling or regulating processes or operations
  • B22D11/163—Controlling or regulating processes or operations for cutting cast stock
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
  • B22D11/16—Controlling or regulating processes or operations
  • B22D11/20—Controlling or regulating processes or operations for removing cast stock
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B15/0007—Cutting or shearing the product
  • B21B2015/0014—Cutting or shearing the product transversely to the rolling direction

Definitions

• the invention relates to a method for operating a plant in the metallurgical industry, in particular a casting and / or rolling plant for manufacturing a metal product with the participation of a cutting or a forming device.
• FIG. 3 shows an example of such a plant in the metallurgical industry, as is basically known in the prior art.
• FIG. 3 specifically shows a combined casting and rolling plant.
• the casting installation is denoted by the reference number 1. It consists of a mold arranged on the inlet side and a strand guide arranged downstream of the mold in the continuous casting direction for deflecting a cast strand cast in the mold from the vertical to the horizontal. The direction of material flow is from left to right in FIG.
• the casting installation is denoted by the reference number 1. It consists of a mold arranged on the inlet side and a strand guide arranged downstream of the mold in the continuous casting direction for deflecting a cast strand cast in the mold from the vertical to the horizontal.
• the direction of material flow is from left to right in FIG.
• the rolling mill comprises, for example, two roughing stands 3, a transfer bar cooling system 4, an oven 5, an inductive heating system 6, and a plurality of
• the sub-units of the casting plant and the rolling plant mentioned are partially optional and by no means all have to be implemented in a specific plant. All sub-assemblies are subject to a central one
• the system shown in FIG. 3 is a typical Continuous Slap Production CSP system, which can in particular be run in a batch operating mode.
• the present invention is by no means limited thereto. Rather, the present invention can also Can be used in any systems of the type mentioned, in particular those that can be operated in a so-called endless operation and / or a so-called semi-endless operation in addition to the batch operation.
• Plants in the metallurgical industry with permanently installed cutting or reshaping devices can occasionally no longer cut or reshape new metal products to be manufactured because they are too strong or because their resistance to severing or reshaping is too great. The performance of the permanently installed cutting or forming devices is then no longer sufficient in this case.
• the overall quality or quality aimed for in the manufacture of the metal product is advantageously not impaired by this measure, because the said temperature increase only relates to the very narrow length section in which a separation of the metal product is provided anyway.
• the invention is based on the object of providing an alternative method for operating a plant in the metallurgical industry in which a metal product is separated or reshaped by a severing or reshaping device with limited performance. This object is achieved by the method according to claim 1.
• This method is characterized by the following steps: a) specifying a threshold value which is characteristic of the performance of the separating or shaping device; b) calculating an actual value for a parameter of the metal product in the length section, the parameter representing the resistance of the metal product to separation or forming processes; c) comparing the calculated actual value of the parameter with the predetermined threshold value to determine whether the actual value of the parameter is greater than the threshold value; d1) if yes: local processing of the metal product in said length section in such a way that the value of the parameter falls below the threshold value, and cutting or reshaping of the metal product in said length section only when the actual value of the parameter is less than the threshold value;
• the claimed method offers the advantage that it is first checked whether the performance of the cutting or shaping devices present in the system is sufficient to cut or reshape the metal product to be manufactured. Only if this is not the case because the threshold value representing the performance is smaller than the actual value of the parameter representing the resistance of the metal product in the length section, a suitable processing takes place, ie weakening of the metal product in the previously defined Length section. Should the Separating or reshaping device, however, are determined, the targeted processing or weakening of the metal product in the length section is dispensed with and the costs associated therewith are saved.
• any physical or metallurgical property of the metal product can be used as a parameter for carrying out the method according to the invention, provided that this parameter only represents the resistance of the metal product to separation or forming processes, at least in part.
• the parameter can be individual parameters, such as B. the thickness, the width, the temperature or the strength of the material of the metal product, but also a functional link between such individual parameters. Accordingly, the processing step for the targeted weakening of the metal product in the length section is not limited to a single measure.
• one or more processing steps can be selected from a bundle of individual processing steps in order to weaken the metal product in a targeted manner and thus also in a plant in the metallurgical industry with permanently installed cutting or forming devices to be able to manufacture with limited capacity.
• p f (w, d, T, k f ) (1)
• d is the thickness of the metal product in particular in the length section
• w the width of the metal product in particular in the length section
• T is the temperature of the metal product, in particular in the length section k f
• the strength of the metal product, in particular in the length section f is the functional link between the parameters w, d, T and / or k f ; and the link being designed in such a way that its functional value, which corresponds to the actual value pi st of the parameter, increases when the thickness, the width and / or the strength of the metal product increases and / or that its functional value decreases when the temperature of the Metal product increases.
• the parameter p can be calculated as follows, for example:
• the temperature is disregarded in the formula (3).
• step d1) it turns out that the actual value of the parameter for the metal product is not yet smaller than the threshold value even after processing in the predefined length segment, the present invention provides that steps b), c) and d1) or d2) are repeated iteratively, preferably until the actual value of the parameter is smaller than the threshold value, in order to then achieve the desired separation or To be able to carry out the forming process with the existing power-limited cutting or forming device.
• Figure 1 shows a first embodiment for the claimed
• Machining step in a predefined length of the metal product here, for example, a reduction in thickness
• Figure 2 shows a second embodiment for the claimed
• Machining step over the length section here, by way of example, a reduction in the strength of the metal product
• Figure 3 shows a casting and rolling plant from the prior art.
• FIGS. 1 and 2 in the form of exemplary embodiments.
• the same technical elements are denoted by the same reference symbols.
• the cutting force of a separating device and the reshaping possibility of a reshaping device, in particular the winding possibility of a flasher, are always limited.
• the power required by the flasher for winding a first turn is particularly great.
• the load on the separating device or the shaping device is to be reduced.
• the said length section can in principle be predefined at any point along the length of the metal strip.
• it can be fixed at the cutting point of the separating device, that is to say at the transition from one end of the strip to the next beginning of the strip or, in the case of forming by a reel, on the head of a metal product; in the latter case to facilitate the winding of the first winding of the tape head on the reel in particular.
• the load on the separating device and the forming device increases with increasing thickness, increasing width and increasing strength of the material of the metal product.
• the load decreases with increasing temperature, since the strength or the flow stress of the material then decreases.
• the load depends on the material.
• a softer material with a lower k f is easier to cut or wind than a stronger material.
• the term "load" means the resistance of the metal product to cutting or forming processes.
• a parameter p for a metal product which, as stated, represents the resistance of the metal product to separation or forming processes.
• the present invention recommends calculating this parameter according to an exemplary embodiment for the above formula (1) as the actual value pist:
• d denotes the thickness of the metal product
• w the width of the metal product
• T the temperature of the metal product
• k f a Material parameter of the metal product, which represents its strength.
• the parameter c designates any constant.
• the parameter p can also be calculated as an actual value as follows:
• an actual value for the parameter in the length section can be calculated for each metal product to be produced on the system.
• a threshold value is defined for at least individual, preferably for all separating or shaping devices present in the system, which characterizes the performance of the individual separating or shaping devices with regard to their separating or shaping force.
• the method according to the invention then provides that the actual value of the parameter calculated for the metal product to be manufactured is compared with the predefined threshold value for the performance of the individual devices to determine whether the actual value is greater than the threshold value; see process step c). I. E. it is checked whether the
• Resistance of the metal product is greater than the performance of the individual, especially the least powerful device. If this is the case, the metal product is specifically weakened as it passes through the system before it reaches the corresponding cutting or shaping device in the said length section, with the aim that the actual value of the
• the parameter falls below the threshold value. Only when this goal has been achieved can the intended cutting or reshaping of the metal product in said length section take place with the aid of the cutting or reshaping device present in the system. As long as the actual value of the parameter is not yet below the threshold value, the metal product to be manufactured cannot be processed correctly by the cutting or forming device. If the actual value of the parameter has not yet fallen below the threshold value after a first processing step of the metal product has been carried out, it is advisable to repeat the claimed process steps b), c) and d1) or 62) until the actual value the parameter has fallen below the threshold value. Only then can the metal product be processed by the existing cutting or forming device.
• This position or the corresponding length Lx of the metal product which is typically determined in advance by the automation of the system, is tracked when the metal strip is guided through the system, at least until it reaches the cutting device or the forming device.
• the cutting or reshaping of the metal product is then carried out by the said cutting or reshaping device exclusively in the predetermined length section.
• the inventive processing or weakening of the metal product in the length range Lx to reduce the local actual value of the parameter there can be carried out by at least one of the following individual steps: Decrease in metal product cause a thinner thickness over length Lx; see FIG. 1. This procedure has the particular advantage that the amount of material in the length section Lx can be reduced.
• ii) reducing the width w of the metal product with the aid of an upsetter or by varying the width of the cast strand in the mold; this also has the advantage that the material in the longitudinal section, ie in the transition area z. B. is gradually reduced or decreased.
• iii) Increasing the temperature of the metal product, for example by inductive heating or transferable cooling or by using a suitable cooling strategy in the secondary cooling of the casting plant or the cooling section of the rolling plant, the strategy in each case providing for a reduction in the cooling capacity over the length section.
• iv) Reducing the strength of the metal product over the length section, see FIG. 2, for example also by using a suitable cooling strategy.
• a lower target strength or a reduced value for the parameter k f in the length section can be set by means of a microstructure model in that the process variables are predefined in a suitable manner.
• the process variables can be, for example, the furnace, final rolling or coiling temperature or the dwell times of, in particular, the length of the metal product in the furnace or a finishing rolling train.
• the process variables to be specified for the structure model can also be the parameters mentioned above, such as the thickness, the width or the strength or the temperature of the metal product.
• the properties can also be influenced by changing the acceptance distribution in the stands.
• a higher-level module - based on algorithms or artificial intelligence algorithms, such as neural networks or others - can be installed, which then decides whether the thickness, the temperature, the width or the material parameter k f or several of these values should be changed to lower the actual value of the parameter below the threshold value. Furthermore, this model can decide which unit, ie which separating or forming device of the plant is to take over the variation of the selected parameters. In the event of problems or malfunctions in individual separating or reshaping devices, according to the invention, planning can also be carried out during ongoing operation.
• This can mean, for example, that instead of an initially planned reduction in thickness of the metal product due to a disruption of the rolling stand provided for the reduction in thickness, a reduction in the width and / or an increase in temperature over the longitudinal section of the metal product is carried out in order to keep the actual value of the parameter below the Lower the threshold.
• the decisive factor in rescheduling can be that the best possible quality is achieved or that as little energy as possible is consumed or that production remains as stable and safe as possible.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Winding, Rewinding, Material Storage Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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• 2019
  • 2019-11-19 DE DE102019217839.1A patent/DE102019217839A1/de active Pending
• 2020
  • 2020-10-28 EP EP20797756.2A patent/EP4061558A1/de active Pending
  • 2020-10-28 JP JP2022528259A patent/JP7397193B2/ja active Active
  • 2020-10-28 CN CN202080079022.5A patent/CN114728329B/zh active Active
  • 2020-10-28 US US17/778,162 patent/US20230032062A1/en active Pending
  • 2020-10-28 WO PCT/EP2020/080233 patent/WO2021099077A1/de unknown

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