EP4688298A1 - Arbeitswalze zum walzen eines metallischen gutes, walzgerüst, metallisches band, verfahren zur herstellung einer arbeitswalze sowie verwendung einer arbeitswalze - Google Patents
Arbeitswalze zum walzen eines metallischen gutes, walzgerüst, metallisches band, verfahren zur herstellung einer arbeitswalze sowie verwendung einer arbeitswalzeInfo
- Publication number
- EP4688298A1 EP4688298A1 EP24728511.7A EP24728511A EP4688298A1 EP 4688298 A1 EP4688298 A1 EP 4688298A1 EP 24728511 A EP24728511 A EP 24728511A EP 4688298 A1 EP4688298 A1 EP 4688298A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- equal
- protection layer
- wear protection
- less
- particularly preferably
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
- B21B27/03—Sleeved rolls
- B21B27/032—Rolls for sheets or strips
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/067—Metallic material containing free particles of non-metal elements, e.g. carbon, silicon, boron, phosphorus or arsenic
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C4/11—Oxides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/123—Spraying molten metal
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/10—Roughness of roll surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/26—Hardness of the roll surface
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
Definitions
- the invention relates to a work roll for rolling a metallic material, in particular for rolling a metallic strip, comprising a base body made of metal and a wear protection layer arranged at least in regions on the base body, wherein the wear protection layer is a thermal splash protection layer.
- the invention further relates to a rolling stand.
- the invention further relates to a metallic strip which is cold rolled by means of a work roll.
- the invention further relates to a method for producing a work roll.
- the invention also relates to a use of a work roll.
- such work rolls are provided with a suitable wear protection layer on their surface, by means of which at the same time it can be possible to create a defined surface texture on a tape.
- a suitable wear protection layer comprises a hard chrome coating, which, however, also tends to form microcracks, which in turn can have a negative effect on the service life and corrosion resistance.
- a hexavalent chromium Cr-6 has been used up to now. It is now considered proven that Cr-6 is carcinogenic and/or mutagenic.
- the invention is based on the object of providing an improvement or an alternative to the prior art.
- the object of the invention is achieved by a work roll for rolling a metallic material, in particular for rolling a metallic strip, having a base body made of metal and a wear protection layer arranged at least in regions on the base body, wherein the wear protection layer is a thermal splash protection layer, wherein the wear protection layer has a chromium content of less than or equal to 90 wt. %, preferably less than or equal to 60 wt. %, and particularly preferably less than or equal to 30 wt. %.
- a chromium content of the wear protection layer and the related properties of the wear protection layer please refer to Table 1.
- the present wear protection layer serves to protect the working roll from wear.
- the wear protection layer is designed as proposed, an improved wear resistance of the base body of the work roll can be ensured.
- the wear protection layer proposed here enables the work roll, but especially the wear protection layer itself, to be provided as freely as possible, preferably entirely, without the chromium, in particular hard chromium, which has previously been predominantly required for wear protection layers, and this with at least the same or even improved qualitative properties, such as an improved surface quality, an improved service life and other improved properties of the work roll, as described in more detail below.
- the wear protection layer makes it possible to ensure a consistent roughness on the work roll surface that lasts as long as possible, which influences the desired target values for the metallic material to be rolled for as long as possible, such as in particular the roughness and texture or smoothness of a producing metallic material surface, in particular of a metallic strip to be produced.
- a lower nickel content should be set, in particular a nickel content of less than or equal to 90 wt. %, preferably less than or equal to 60 wt. % and particularly preferably less than or equal to 30 wt. % since the wear resistance decreases with increasing nickel content.
- Chromium and/or nickel content (wt.%) : residual compressive stresses and wear resistance (evaluation between 0 and 10 with the individual scales between smallest possible (0) and largest possible (10) (scale designation: k-g) as well as neutral (0) and best possible (10) (scale designation: n-b) )
- the wear resistance of the wear protection layer can be improved with a higher chromium content and/or a lower nickel content, whereby mutagenic and/or carcinogenic effects on the environment can be reduced by smaller Chromium content and smaller nickel content can be improved or avoided.
- the wear resistance of the wear protection layer can also be supported by the level of residual compressive stresses in the wear protection layer.
- the wear protection layer By building up residual compressive stresses in the wear protection layer, the wear protection layer can be advantageously clamped to the base body, which ultimately also improves the layer stability and/or the layer quality, in particular the adhesive tensile strength.
- the adhesive tensile strength of the wear protection layer can be advantageously influenced, in particular, by a decreasing nickel content.
- any microcracks that may occur in the wear protection layer can be closed again by residual compressive stresses in the wear protection layer, whereby any crack growth of the microcracks can be advantageously reduced or prevented.
- the wear protection layer has an outer surface with an arithmetic mean roughness R a of greater than or equal to 0.01 gm, preferably greater than or equal to 0.5 gm and particularly preferably greater than or equal to 1.5 gm, and/or if the wear protection layer has an outer surface with an arithmetic mean roughness R a of less than or equal to 17 gm, preferably less than or equal to 10 gm and particularly preferably less than or equal to 6 gm.
- the roughness R a of the wear protection layer of the present work roll can be individually adjusted to the requirements of the product to be treated with it, which in turn allows the roughness R a on the product surface to be determined almost arbitrarily, in particular the surface roughness of a strip material.
- the factory roughness R a of the wear protection layer of the product to be sold can be adjusted in this way.
- the possibility of a specific determination of a surface roughness of a product is particularly advantageous with regard to various product properties, such as the paintability of a product, the feel of a product, the deep-drawing and/or pressing behavior of a product, the adjustability of rolling forces or the like.
- a generic work roll can be advantageously further developed solely by means of the features relating to the arithmetic mean roughness value, so that relevant features or combinations of features thereof are already advantageous without the other features of the invention.
- a small value for the arithmetic mean roughness R a of the outer surface of the wear protection layer can lead to a better texture of the work roll and of a strip material rolled with the work roll and to an advantageous adjustability of the rolling forces.
- An average value (cf. Table 2) for the arithmetic mean roughness R a of the outer surface of the wear protection layer can contribute to optimal conditions for the paintability of a metallic product rolled with the work roll.
- wear protection layers with a low value (cf. Table 2) for the arithmetic mean roughness R a of the outer surface of the wear protection layer contribute to a lower porosity of the wear protection layer, so that with low values for the arithmetic mean roughness R a the adhesive tensile strength of the wear protection layer, which depends on the porosity of the wear protection layer, can also be improved.
- the wear protection layer has a grain size with a value of greater than or equal to 2 pm, preferably greater than or equal to 5 pm, and/or having a grain size of less than or equal to 50 pm, preferably less than or equal to 45 pm and particularly preferably less than or equal to 30 gm or less than or equal to 20 gm.
- grain size in the sense of the invention describes the average diameter or the average area in a micrograph of the crystallites (grains) within a polycrystalline metal.
- the grain size of the wear protection layer proposed here results in thermal spraying in particular from a size of particles of a starting material for providing the coating material for producing the wear protection layer.
- the term “grain size” therefore correlates strongly with the particle size of powder particles of a powder for the starting material.
- element distribution in the sense of the invention describes the volumetric proportion of hard phase and matrix, whereby the volumetric proportion can be determined, for example, after coating the base body by means of microscopy.
- matrix or “matrix material” in the sense of the invention is a structure of a deposited wear
- the matrix of the wear protection layer may comprise iron and/or nickel and/or cobalt and/or molybdenum and/or boron and/or tungsten.
- the chemical resistance of the matrix of the wear protection layer can be improved.
- a matrix containing nickel can ensure that the wear protection layer is chemically resistant overall, and in particular is corrosion resistant.
- Cobalt as a component of the matrix of a wear protection layer can lead to an increase in the temperature resistance of the wear protection layer. Cobalt can also advantageously be used to increase the hardness of the matrix and thus of the entire wear protection layer.
- the chemical resistance and/or the temperature resistance of the wear protection layer, in particular of the matrix can be improved.
- the temperature resistance of the matrix and thus also of the entire wear protection layer if the matrix contains tungsten. It has been shown that the adhesive properties of the matrix and thus also of the wear protection layer as such can be improved by using boron as a matrix component.
- the matrix of the wear protection layer can also contain manganese, copper, chromium and/or silicon, whereby the matrix of the wear protection layer can be further optimized with regard to its ductility, its hardness, its chemical resistance, its machinability, its friction properties, its temperature resistance, its adhesion resistance and/or the like.
- a "hard phase” is embedded or “floating" embedded in a softer material of the wear protection layer, in particular in a softer matrix or a softer matrix material of the wear protection layer.
- Hard phases suitable for the wear protection layer can in particular be oxidic, carbide or boride hard phases, which advantageously have a high hardness.
- oxidic, carbide or boride hard phases which advantageously have a high hardness.
- a compound of silicon and carbon can be used, which forms silicon carbide (SiC).
- adheresive tensile strength describes the resistance to adhesion acting on the wear protection layer.
- Adhesion is the adhesive capacity of the wear protection layer on the base body of the working roll.
- phase generally describes a state of one or more elements.
- an intermetallic phase describes a compound, in particular a homogeneous chemical compound, of at least two metals.
- the grain size of the wear protection layer affects a number of properties of the wear protection layer.
- the grain size can be influenced by the process parameters of the thermal spraying of the wear protection layer, in particular via the average diameter of the powder used.
- the grain size can have a beneficial effect on the homogeneity of the wear protection layer, in particular on the homogeneity of the distribution of the coating elements within the wear protection layer, in particular on the distribution of the hard phase elements within the wear protection layer, as well as on the homogeneity of the thickness of the wear protection layer. Tests have shown that the homogeneity mentioned above can be improved with decreasing grain size.
- the roughness R a in particular the arithmetic mean roughness R a , of the wear protection layer can be influenced by means of the grain size.
- a smaller value for the arithmetic mean roughness R a of a thermally sprayed and subsequently not reworked wear protection layer can be achieved with a smaller grain size.
- the grain size can influence the residual stress in the wear protection layer, whereby the residual stress in the wear protection layer can be increased with smaller grain size It has been shown that higher residual stresses in the wear protection layer can lead to an improvement in the adhesive tensile strength, whereby the risk of delamination of the wear protection layer from the base body of the work roll can be reduced on the one hand by a decreasing grain size.
- the delamination resistance is also influenced by the influence of the grain size on the porosity of the wear protection layer.
- Tab. 3 Grain size of the wear protection layer (pm): Roughness of the wear protection layer, roughness of a product (strip) machined with the work roll, residual stresses in the wear protection layer and/or the base body, porosity, hardness, number of peaks, homogeneity, in particular homogeneity of the distribution of the coating elements within the wear Protective layer as well as homogeneity of the thickness of the wear protection layer, (coating) element distribution, adhesive strength and delamination resistance (each rated between 0 and 10 with the individual scales between smallest possible ( 0 ) and largest possible ( 10 ) ( scale designation : kg) as well as neutral ( 0 ) and best possible ( 10 ) ( scale designation : nb ) )
- the grain size achieved within a wear protection layer can also influence the kinetics of the coating material when applied to the base body surface during the thermal spraying process, as well as the temperature of the particles of the coating material.
- the grain size can also influence the porosity of the wear protection layer, in particular a larger grain size increase the porosity of the wear protection layer, which may reduce the hardness and/or delamination resistance of the wear protection layer.
- the grain size can also influence the number of peaks of a wear protection layer and, associated with this, also the roughness of a metallic strip treated with the work roll, whereby the optimum number of peaks can be achieved in a medium range of the grain size considered here, so that the roughness of a metallic strip treated with the work roll can also assume optimum values in a medium range of the grain size considered here.
- a generic work roll can be advantageously further developed solely by means of the features relating to the grain size, so that relevant features or combinations of features are already advantageous without the other features of the invention.
- the wear protection layer has a proportion of tungsten carbide (WC) of greater than or equal to 50 wt. %, preferably a proportion of greater than or equal to 60 wt. %, and particularly preferably of greater than or equal to 70 wt. %.
- WC tungsten carbide
- tungsten carbide is explicitly understood to mean mono-tungsten carbide (WC).
- the hardness of the wear protection layer can be advantageously increased, whereby an increased proportion of mono-tungsten carbide (WC) in the wear protection layer allows the hardness of the wear protection layer to increase further.
- the wear protection layer can advantageously have a proportion of tungsten carbide (WC) of greater than or equal to 2 wt. %, preferably a proportion of greater than or equal to 20 wt. %, and particularly preferably greater than or equal to 25 wt. % or greater than or equal to 30 wt.
- the wear protection layer can have a proportion of tungsten carbide (WC) of greater than or equal to 40 wt. %, preferably a proportion of greater than or equal to 45 wt. %, and particularly preferably greater than or equal to 65 wt. % or greater than or equal to 70 wt.
- the wear protection layer can have a proportion of tungsten carbide (WC) of greater than or equal to 75 wt. %, preferably a proportion of greater than or equal to 80 wt. %, and particularly preferably greater than or equal to 85 wt. % or greater than or equal to 87 wt.
- the wear protection layer can be further improved if the wear protection layer has a proportion of tungsten precipitates, in particular of elemental tungsten (W) and/or ditungsten carbide (W 2 C), with a proportion of less than or equal to 50 wt. %, preferably less than or equal to 33 wt. %, and particularly preferably less than or equal to 10 wt. % or less than or equal to 5 wt. %.
- W elemental tungsten
- W 2 C ditungsten carbide
- Tungsten precipitates in the form of elemental tungsten (W) and/or ditungsten carbide (W 2 C) can be formed by degradation of tungsten carbide (WC).
- Tab. 4 Tungsten precipitates (elemental tungsten and/or ditungsten carbide W 2 C) in the wear protection layer (wt.%): embrittlement, wear resistance, fracture toughness, adhesive tensile strength, service life, hardness and layer adhesion of the wear protection layer (evaluation between 0 and 10 with the individual scales between smallest possible (0) and largest possible (10) (scale designation: kg) as well as neutral (0) and best possible (10) (scale designation: nb))
- Tungsten precipitates in the wear protection layer can contribute to embrittlement of the wear protection layer, whereby the wear resistance of the wear protection layer, the fracture toughness of the wear protection layer and/or the adhesive tensile strength of the wear protection layer can be reduced with an increasing proportion of tungsten precipitates.
- a higher proportion of tungsten precipitates in the wear protection layer can therefore reduce its service life.
- a higher "wt. %" content of tungsten precipitates for example, can increase the hardness of the wear protection layer.
- the proportion of tungsten precipitates within the wear protection layer can have an influence on the layer adhesion between adjacent, in particular superimposed, and not simultaneously worn individual layers of the wear protection layer, whereby the layer adhesion can decrease with an increasing proportion of tungsten precipitates.
- the wear protection layer has a balanced "w/w" proportion of tungsten precipitates.
- the wear protection layer has a layer thickness of greater than or equal to 2 gm, preferably greater than or equal to 5 gm and particularly preferably greater than or equal to 10 gm, and/or a layer thickness of less than or equal to 80 gm, preferably less than or equal to 40 gm and particularly preferably less than or equal to 15 gm.
- the reason for this trend reversal may be the decreasing values for the magnitude of the residual stresses in the wear protection layer resulting from smaller values for the layer thickness of the wear protection layer, since it has been shown that the delamination resistance can increase with increasing values for the residual stresses in the wear protection layer.
- values for the achievable minimum arithmetic roughness of the surface of the wear protection layer can increase and/or an increasing deterioration of the homogeneity of the thickness distribution of the wear protection layer can result, so that larger values for the layer thickness of the wear protection layer can also contribute to a higher post-processing effort of the wear protection layer until its designated use.
- the wear protection layer has an adhesive tensile strength with an adhesive tensile value of greater than or equal to 60 N/mm 2 , preferably greater than or equal to 70 N/mm 2 , and particularly preferably greater than or equal to 80 N/mm 2 or greater than or equal to 100 N/mm 2 .
- the wear protection layer under test When carrying out an adhesion tensile test, it can be determined whether the wear protection layer under test has a tensile strength in the normal direction to the wear protection layer after the test. has completely, partially or not at all flaked off under the applied tensile force. Therefore, the tensile adhesive strength is understood to be the value for a tensile force at which the wear protection layer has not flaked off at all at the point under investigation. Accordingly, higher values for the tensile adhesive strength are advantageous for the delamination resistance of the wear protection layer.
- the wear protection layer has an adhesive tensile strength with an adhesive tensile value of greater than or equal to 55 N/mm 2 , preferably greater than or equal to 65 N/mm 2 , and particularly preferably greater than or equal to 75 N/mm 2 or greater than or equal to 90 N/mm 2 .
- a generic work roll can be advantageously further developed solely by means of the adhesive tensile strength of the wear protection layer, so that relevant features or combinations of features are already advantageous without the other features of the invention.
- the wear protection layer has a porosity with a porosity value of less than or equal to 1%, preferably less than or equal to 0.5% and particularly preferably less than or equal to 0.1%.
- Porosity of the wear protection layer (%): quality, corrosion resistance, delamination resistance, surface roughness, hardness, residual stresses and peak number of the wear protection layer (each rating between 0 and 10 with the individual scales between smallest possible (0) and largest possible (10) (scale designation: kg) and neutral (0) and best possible (10) (scale designation: nb)).
- the term "porosity” describes the number and/or size of the pores in the wear protection layer, which is given in percent (%). This number can be determined, for example, by means of an optical evaluation or with the help of a permeation test, in which the water displacement of the wear protection layer and/or the work roll together with the wear protection layer is examined under the influence of a vacuum. Tests have shown that the general quality of the wear protection layer of a work roll with regard to the required properties of a work roll, in particular corrosion resistance, delamination resistance and hardness, can be improved with decreasing porosity of the wear protection layer.
- the corrosion resistance of the wear protection layer can be improved by decreasing the porosity values.
- the adhesive strength or delamination resistance of the wear protection layer can also be positively influenced by smaller values for the porosity of the wear protection layer.
- the hardness of the wear protection layer can also be increased by decreasing the porosity values.
- Small values for the roughness of the outer surface of the wear protection layer can be advantageously achieved, in particular with a low value for the porosity, in particular by the additive application of the wear protection layer by means of a thermal spraying process and/or by the subtractive removal of an outer layer of the wear protection layer.
- Achievable values for the residual stress in the wear protection layer can also be increased by low values of porosity.
- a generic work roll can be advantageously further developed solely by means of the porosity of the wear protection layer, so that relevant features or combinations of features are already advantageous without the other features of the invention.
- the wear protection layer has a permeability with a permeability value of less than or equal to 1 Barrer, preferably less than or equal to 0.5 Barrer and particularly preferably less than or equal to 0.1 Barrer.
- the permeability of the wear protection layer can also influence its quality. For example, a better layer quality with regard to the wear protection layer can be achieved if the wear protection layer has a low permeability, in particular a low gas permeability in Barrer.
- the general quality of the wear protection layer of a work roll with regard to the required properties of a work roll in particular corrosion resistance, delamination resistance and hardness, can be improved with decreasing permeability of the wear protection layer.
- the corrosion resistance of the wear protection layer can be improved with decreasing permeability values.
- the adhesive strength or delamination resistance of the wear protection layer can also be positively influenced by smaller permeability values of the wear protection layer.
- the hardness of the wear protection layer can also be increased with decreasing permeability values.
- Tab. 7 Permeability of the wear protection layer (Barrer): quality, corrosion resistance, delamination resistance,
- permeability describes the permeability of the wear protection layer, which can be determined primarily by the number of permeable or open pores in the wear protection layer, in particular pores through which gas can flow.
- a generic working roll can be advantageously further developed solely by means of the permeability of the wear protection layer, so that relevant features or combinations of features can be achieved without the other features of the
- the wear protection layer has a layer hardness with a layer hardness value of greater than or equal to 800 HV, preferably greater than or equal to 1000 HV and particularly preferably greater than or equal to 1100 HV, and/or with a layer hardness value of less than or equal to 1600 HV, preferably less than or equal to 1500 HV and particularly preferably less than or equal to 1400 HV.
- HV Layer hardness of the wear protection layer
- Wear resistance and adhesive tensile strength of the wear protection layer (evaluation between 0 and 10 with the individual scales between smallest possible (0) and largest possible (10) (scale designation: k-g) as well as neutral (0) and best possible (10) (scale designation: n-b) )
- the wear resistance of the wear protection layer can be advantageously influenced or improved.
- the ratio of hard phase to matrix, the precipitation of ditungsten carbide (W 2 C ), the porosity and/or the permeability have an influence on the hardness of the wear protection layer of the working roll.
- the wear protection layer has a deviation of less than or equal to 40% from a weight proportion of a coating element averaged over a total number of analysis points, preferably a deviation of less than or equal to 30% and particularly preferably a deviation of less than or equal to 20%, at more than or equal to 80% of a number of analysis points, preferably at more than or equal to 90% of a number of analysis points and particularly preferably at more than or equal to 95% of a number of analysis points, wherein the total number of analysis points is greater than or equal to 5, preferably greater than or equal to 15 and particularly preferably greater than or equal to 25, in particular the coating element is a the elements tungsten carbide ( WC), aluminum oxide (AI2O3), zirconium oxide ( ZrO2 ), chromium carbide ( Cr3C2 , Cr7C3 and/or Cr23C6 ) or vanadium carbide (VC).
- the coating element is a the elements tungsten carbide ( WC), aluminum oxide (AI2O3), zirconium oxide
- the properties of the wear protection layer can also be advantageously influenced by the homogeneity of the element distribution.
- the chemical element composition in particular can be determined locally. Both qualitative and quantitative analyses are possible.
- a determination in this regard can be made using microanalytical methods, such as an "EDX analysis” (Energy Dispersive X-ray Spectroscopy).
- EDX analysis can be used to advantageously carry out investigations of coating compositions. Even unknown materials or contamination with regard to chemical elements can be analyzed on the existing wear protection layer. Layer thickness measurements with regard to the wear protection layer can also be carried out.
- Homogeneity of the element distribution (qualitative): Homogeneity of the distribution of hard phase to matrix, hardness, porosity, (compressive) residual stress, delamination resistance and homogeneity of the layer thickness of the wear protection layer (evaluation between 0 and 10 with the individual scales between smallest possible (0) and largest possible (10) (scale designation: k-g) as well as neutral (0) and best possible (10) (scale designation: n-b) )
- the more inhomogeneous a starting material is when fed into the thermal spraying process the more inhomogeneous the resulting wear protection layer is and thus also the ratio of hard phase to matrix of the wear protection layer, which influences several properties of the wear protection layer.
- the more inhomogeneous the ratio of hard phase to matrix the lower the usable hardness of the wear protection layer.
- more defects occur, which increase the porosity of the wear protection layer.
- the usable level of the residual stresses occurring in the wear protection layer is also reduced.
- a decreasing homogeneity of the distribution of the coating elements also leads to a reduction in the adhesive tensile strength of the wear protection layer, which decreases in particular due to an increase in porosity and/or a decrease in a minimum residual stress level.
- an increasing inhomogeneity of the distribution of the coating elements in the wear protection layer can also cause an inhomogeneity of the layer thickness of the wear protection layer.
- a generic work roll can be advantageously further developed solely by means of the homogeneity of the wear protection layer, so that relevant features or combinations of features are already advantageous without the other features of the invention.
- properties of the wear protection layer present can be influenced if the wear protection layer has a thickness deviation of less than or equal to 80% of a number of measuring points, preferably at more than or equal to 90% of a number of measuring points and particularly preferably at more than or equal to 95% of a number of measuring points. 20 % of a layer thickness of the wear protection layer averaged over a total number of measuring points, preferably a deviation of less than or equal to 10 % and particularly preferably a deviation of less than or equal to 5 %, wherein the total number of measuring points is greater than or equal to 10, preferably greater than or equal to 25 and particularly preferably greater than or equal to 40.
- the wear protection layer has a thickness tolerance of less than or equal to 1 gm, preferably less than or equal to 0.5 gm and particularly preferably less than or equal to 0.2 gm.
- the homogeneity of the layer thickness is a particularly advantageous property of a wear protection layer.
- a surface of a wear protection layer with a waviness is not generally desired but only in special cases. Accordingly, for a large number of embodiments of a work roll, a wear protection layer with a homogeneous thickness and/or only small thickness deviations is advantageous.
- the wear protection layer preferably has a thickness tolerance of less than or equal to 2 gm, preferably less than or equal to 0.75 gm and particularly preferably less than or equal to 0.35 gm.
- the roughness Ra of the wear protection layer and/or the waviness of the wear protection layer can be advantageously influenced.
- the wear protection layer has a hard phase and a matrix, wherein the hard phase is embedded in the matrix.
- wear protection layers comprising a hard phase are particularly resistant to wear and thus have an increased service life, especially if at least one hard phase is embedded in a matrix that is softer than the hard phase.
- a hard phase is defined as an inclusion of at least one grain of at least one oxide, a carbide and/or a boride.
- a hard phase comprises tungsten carbide (WC), aluminum oxide (AI2O3), zirconium oxide (ZrO2), chromium carbide (in particular Cr 3 C 2 , Cr 7 C 3 and/or Cr 23 C 6 ), vanadium carbide (VC), silicon carbide (SiC), tungsten boride (WB), chromium oxide (in particular CrO, Cr 2 O 3 , CrO 3 and/or CrO 3 ), titanium carbide (TiC), titanium oxide (in particular TiO, Ti 2 O 3 and/or TiO 3 ) and/or molybdenum carbide (in particular Mo 3 C and/or MoC).
- the wear protection layer has a hard phase and a matrix, in particular a ratio of hard phase to an overall layer system consisting of hard phase and matrix with a ratio of greater than or equal to 40 vol. %, preferably greater than or equal to 50 vol. %, and particularly preferably greater than or equal to 60 vol. %, and/or in particular with a ratio of hard phase to the overall layer system of less than or equal to 90 vol. %, preferably less than or equal to 85 vol. %. and particularly preferably less than or equal to 80 vol . % or less than or equal to 75 vol . % .
- Ratio of hard phase to matrix i.e. the ratio of hard phase to the total layer system consisting of hard phase and matrix: hardness, roughness R a , density, homogeneity of element distribution, homogeneity of layer thickness distribution, peak number, adhesive tensile strength, residual stresses and porosity of the wear protection layer (evaluation between 0 and 10 with the individual scales between smallest possible ( 0 ) and largest possible ( 10 ) ( scale designation : kg) as well as neutral ( 0 ) and best possible ( 10 ) ( scale designation : nb ) . )
- ratio of hard phase to matrix is to be understood in a quantitative sense as the proportion of the hard phase in the wear protection layer, i.e. the ratio of hard phase to the overall layer system consisting of hard phase and matrix.
- the ratio of hard phase/matrix can be used as a measure of the element distribution in the wear protection layer.
- the hard phase and the matrix are present in an optimal ratio to each other, because the more hard phases there are, the higher the hardness of the wear protection layer.
- the higher the hard phase content the more particles can protrude from the wear protection layer, which can influence the roughness Ra of the surface of the wear protection layer.
- Other interactions related to the existing hard phase/matrix ratio may occur at the wear protection layer in terms of peak count, adhesion, residual stresses and/or porosity.
- the wear protection layer comprises at least one , two, three, four, five, six, seven or more of the elements tungsten carbide (WC), aluminum oxide (AI2O3), zirconium oxide ( ZrO2 ), chromium carbide ( Cr3C2 , Cr7C3 and/or Cr23C6 ), vanadium carbide (VC), silicon carbide (SiC), tungsten boride (WB), chromium oxide (CrO, Cr2O3 , CrO2 and/or CrO3 ), titanium carbide (TiC), titanium oxide (TiO, Ti2O3 and/or TiO2 ) or molybdenum carbide ( Mo2C and/or MoC), in particular at least one, two, three, four or more of the elements tungsten carbide (WC), aluminum oxide ( Al2O3 ), Zirconium oxide (ZrO 2 ), chromium carbide (Cr 3 C 2 , Cr 7 C 3 and/or Cr 23 C 6
- the properties of all wear protection layers can be influenced with the following coating elements, consisting of tungsten carbide (WC), aluminum oxide (Al 2 O 3 ), zirconium oxide (ZrO 2 ), chromium carbide (Cr 3 C 2 , Cr 7 C 3 and/or Cr 23 C6), vanadium carbide (VC), silicon carbide (SiC), tungsten boride (WB), chromium oxide (CrO, Cr 2 O 3 , CrO 2 and/or CrO 3 ), titanium carbide (TiC), titanium oxide (TiO, Ti 2 O 3 and/or TiO 2 ) or molybdenum carbide (Mo 2 C and/or MoC), in particular at least one, two, three, four or more of the elements tungsten carbide (WC), aluminum oxide (AI2O3), zirconium oxide (ZrCt), chromium carbide (Cr 3 C2, Cr 7 C3 and/or Cr 2 3Ce) and/or vanadium carbide (
- the wear protection layer can be further influenced by means of the hard phase and the matrix.
- the ratio of hard phase to matrix can be advantageously defined, as already described above.
- Different coating elements are generally characterized by different properties, in particular a different hardness, and in this respect one element of the wear protection layer or several elements of the wear protection layer can advantageously influence their hardness as well as other properties of the wear protection layer.
- the wear protection layer and/or the base body has a residual compressive stress with a value of greater than or equal to -200 N/mm 2 , preferably greater than or equal to 0 N/mm 2 and particularly preferably greater than or equal to 200 N/mm 2
- the wear protection layer and/or the base body has a residual compressive stress with a value of less than or equal to 2,000 N/mm 2 , preferably less than or equal to 1,500 N/mm 2 and particularly preferably less than or equal to 1,000 N/mm 2 .
- negative values for a residual stress or a compressive residual stress should be understood as tensile residual stress.
- an improvement in the wear resistance of the work roll can be achieved, in particular by a particularly close connection or “clamping" of the wear protection layer on a coated component, such as the base body of the present work roll.
- an improvement in the layer adhesion can be achieved by forming the proposed residual compressive stresses.
- crack formation in particular micro-crack formation, in the wear protection layer can be counteracted by means of suitable residual compressive stresses.
- any microcracks that may occur in the wear protection layer can be closed again by residual compressive stresses in the wear protection layer, whereby any crack growth of the microcracks can be advantageously reduced or prevented.
- residual tensile stresses can support the growth of microcracks.
- layer growth of the wear protection layer is also negatively influenced by unfavorable tensile residual stresses.
- the adhesive strength of the wear protection layer, the hardness of the wear protection layer, the final The thickness of the wear protection layer can be influenced both negatively and positively by appropriately designed residual stresses, as can be seen in particular from Table 11 below.
- the present value ranges can be determined in different ways, but preferably using the following methods: "ICP sensor monitors the curvature by Tsui and Clyne mode” or “Rigaku stress analyzer of model STRAIN-FLEX MSF-2M", where the compressive residual stresses or residual stresses are measured in N/mm 2 .
- Tab. 11 Residual compressive stress (N/mm 2 ): Wear resistance, layer adhesion, layer adhesion and adhesive tensile strength of each wear protection layer (evaluation between 0 and 10 with the individual scales between smallest possible ( 0 ) and greatest possible ( 10 ) ( scale designation : kg) as well as neutral ( 0 ) and best possible ( 10 ) ( scale designation : nb ) )
- the wear protection layer and/or the base body has a peak number with an RPc value of greater than or equal to 1/cm, preferably greater than or equal to 30/cm and particularly preferably greater than or equal to 60/cm, and/or a peak number with an RPc value of less than or equal to 300/cm, preferably less than or equal to 250/cm and particularly preferably less than or equal to 200/cm.
- a particularly advantageous surface of the wear protection layer can be formed, in particular a particularly advantageous texturing of the surface of the wear protection layer.
- this can also influence the adhesion between the wear protection layer and the base body.
- the present number of points has the unit "points/cm”. Further information on the number of points can be found in DIN 10049-2014.
- a generic work roll can be advantageously further developed solely by means of the features relating to the number of tips, so that relevant features or combinations of features thereof are already advantageous without the other features of the invention.
- the wear protection layer has an oxide content, in particular a content of chromium oxide (CrO, Cr 2 O 2 , CrO 2 and/or CrO 2 ) and/or aluminum oxide (Al 2 O 2 ) and/or zirconium oxide (ZrO 2 ) and/or titanium oxide (TiO, Ti 2 O 2 and/or TiO 2 ), of less than or equal to 5 wt. %, preferably of less than or equal to 3 wt. % and particularly preferably of less than or equal to 1.5 wt. %.
- an oxide content in particular a content of chromium oxide (CrO, Cr 2 O 2 , CrO 2 and/or CrO 2 ) and/or aluminum oxide (Al 2 O 2 ) and/or zirconium oxide (ZrO 2 ) and/or titanium oxide (TiO, Ti 2 O 2 and/or TiO 2 ), of less than or equal to 5 wt. %, preferably of less than or equal to 3 wt.
- Smaller values for the oxide content can be achieved, among other things, by using a thermal spraying device with a lambda value close to one or one .
- the base body has an outer surface to be coated with an arithmetic Average roughness R a of greater than or equal to 0.1 pm, preferably greater than or equal to 0.2 pm and particularly preferably greater than or equal to 0.3 pm, and/or an arithmetic average roughness R a of less than or equal to 14 pm, preferably less than or equal to 4.0 pm and particularly preferably less than or equal to 0.8 pm.
- the roughness R a of the base body surface can also be used to influence the wear protection layer, such as the final roughness R a of the wear protection layer, and also its homogeneity. It can be assumed that the higher the roughness R a of the material to be coated (base body), the higher the roughness R a of the surface of the wear protection layer; and the higher the roughness R a of the material to be coated (base body), the greater the deviation in the layer thickness, which can also negatively influence the homogeneity of the layer thickness of the wear protection layer.
- the particle adhesion and thus also the layer adhesion of the wear protection layer to the base body surface can be influenced by the roughness of the base body surface.
- the roughnesses R a mentioned here with respect to the base body surface can be produced in different ways, whereby several of the roughnesses R a indicated can be achieved by grinding the outer surface (base body surface) of the work roll, such as roughnesses R a of 0.3 pm to 0.8 pm.
- Tab. 12 Average roughness R a (pm) of the wear protection layer: layer roughness, layer thickness, homogeneity of the wear protection layer, residual stresses of the wear protection layer and adhesive tensile strength of the wear protection layer (each rating between 0 and 10 with the individual scales between smallest possible (0) and largest possible (10) (scale designation: kg) as well as neutral (0) and best possible (10) (scale designation: nb) )
- a generic work roll can be advantageously further developed solely by means of the features relating to the arithmetic mean roughness value R a , so that relevant features or combinations of features are already advantageous without the other features of the invention.
- the base body has a base body hardness with a hardness value of greater than or equal to 35 HRC, preferably greater than or equal to 40 HRC and particularly preferably greater than or equal to 50 HRC and/or a base body hardness with a hardness value of less than or equal to 70 HRC, preferably less than or equal to 65 HRC and particularly preferably less than or equal to 60 HRC.
- the layer adhesion of the wear protection layer to the base body of the working roll can be advantageously influenced or adjusted.
- the base body hardness is too soft, components of the wear protection layer can penetrate into the base body, causing damage. If the base body hardness is too hard, there is a risk that a critical number of components of the coating material will bounce off the base body when it is applied.
- defects can in turn influence the residual stresses in the wear protection layer, and vice versa.
- adhesion mechanisms in the spraying process can influence the roughness and layer thickness of the wear protection layer.
- the existing base body hardness HRC is preferably measured using a macro identification method.
- Selected dimensions with regard to the base body such as in particular the width of the base body, the diameter of the base body, the length of the base body, but also the support distance between bearing points of the base body can also affect the quality of the wear protection layer.
- a work roll for rolling a metallic product in particular a wear protection layer thereof, can be advantageously individually adapted to different requirements, taking into account legal requirements for the avoidance of hard chromium.
- the object of the invention is also achieved by a rolling stand having a working roll according to one of the features described here.
- the object of the invention is also achieved by a metallic strip, wherein the metallic strip is cold rolled with a work roll according to one of the features described here.
- the surface image obtained on the metallic strip can be used to identify certain features of the wear protection layer.
- the texturing of the wear protection layer of the working roll can change during rolling.
- such a method can be advantageously further developed if the number of powder conveyors is increased, whereby a more homogeneous powder distribution can be achieved. This can also further increase the quality of the wear protection layer on the working roll.
- powder conveyors can be arranged above a burner for thermal spraying of the wear protection layer (e.g. High Velocity Oxygen Fuel (HVOF burner) or High Velocity Air Fuel (HVAF burner)), whereby the static pressure for introducing the powder into the burner can be expediently increased.
- HVOF burner High Velocity Oxygen Fuel
- HVAC burner High Velocity Air Fuel
- any powders for producing the wear protection layer are preheated.
- the production of the wear protection layer can be advantageously influenced by appropriate preheating or sieving of powder, particularly with regard to crowning/strip dimensions for the purpose of optimizing residual stresses with regard to the wear protection layer.
- the object of the invention is further also achieved by a work roll according to one of the features described here for cold rolling a metallic strip.
- the working roller 1 is processed by means of thermal spraying. More precisely, a wear protection layer 2 is applied to the surface 3 of a base body 4 of the working roller 1.
- the thermal spraying of the wear protection layer 2 is carried out by means of a suitable device 5 for thermal spraying, which has a burner 6, such as an HVOF burner or an HVAF burner, wherein above the burner 6 a plurality of powder conveyors 7 (shown and numbered only as an example) are arranged, at least some of which can preheat the powder 8.
- the powder 8 can be individually mixed together by a plurality of powder components 9, as claimed in the sense of the invention.
- the powder conveyors 7 also have a device 10 for sieving the powder 8 or powder components 9 thereof.
- thermo spraying device 5 By means of the thermal spraying device 5, a particularly advantageously composed coating material 11 can be applied to the base body 4 of the working roller 1 while the latter rotates about its bearing axis 12 in the direction of rotation 12.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geometry (AREA)
- Coating By Spraying Or Casting (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102023113182.6A DE102023113182A1 (de) | 2023-05-19 | 2023-05-19 | Arbeitswalze zum Walzen eines metallischen Gutes, Walzgerüst, metallisches Band, Verfahren zur Herstellung einer Arbeitswalze sowie Verwendung einer Arbeitswalze |
| PCT/EP2024/063704 WO2024240646A1 (de) | 2023-05-19 | 2024-05-17 | Arbeitswalze zum walzen eines metallischen gutes, walzgerüst, metallisches band, verfahren zur herstellung einer arbeitswalze sowie verwendung einer arbeitswalze |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4688298A1 true EP4688298A1 (de) | 2026-02-11 |
Family
ID=91274718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP24728511.7A Pending EP4688298A1 (de) | 2023-05-19 | 2024-05-17 | Arbeitswalze zum walzen eines metallischen gutes, walzgerüst, metallisches band, verfahren zur herstellung einer arbeitswalze sowie verwendung einer arbeitswalze |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4688298A1 (de) |
| KR (1) | KR20250176975A (de) |
| CN (1) | CN121194840A (de) |
| DE (1) | DE102023113182A1 (de) |
| MX (1) | MX2025013791A (de) |
| WO (1) | WO2024240646A1 (de) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60158906A (ja) * | 1984-01-30 | 1985-08-20 | Hitachi Ltd | 圧延用複合ロ−ルおよびその製造方法 |
| JPH0714525B2 (ja) * | 1987-09-30 | 1995-02-22 | ト−カロ株式会社 | 軟質非鉄金属板搬送用ロール |
| FI80097B (fi) * | 1988-04-28 | 1989-12-29 | Valmet Paper Machinery Inc | Vals i presspartiet av en pappersmaskin och foerfarande foer framstaellning av denna. |
| FI86566C (fi) * | 1989-10-27 | 1992-09-10 | Valmet Paper Machinery Inc | Vals foer anvaendning vid pappersframstaellning och foerfarande foer framstaellning av valsen. |
| JPH1161349A (ja) * | 1997-08-08 | 1999-03-05 | Nippon Steel Corp | ロールおよびその製造方法 |
| US8524375B2 (en) * | 2006-05-12 | 2013-09-03 | Praxair S.T. Technology, Inc. | Thermal spray coated work rolls for use in metal and metal alloy sheet manufacture |
| DE102006023690A1 (de) * | 2006-05-19 | 2007-11-22 | Schaeffler Kg | Verfahren zur Herstellung eines Wälzlagerbauteils sowie Wälzlagerbauteil |
| DE102007028823A1 (de) * | 2007-06-20 | 2008-12-24 | Siemens Ag | Verfahren zur Herstellung eines Blechs in einer Walzstraße |
| CN102234755B (zh) * | 2010-04-23 | 2013-03-27 | 南京梅山冶金发展有限公司 | 一种覆有非晶态碳化钨涂层的新型冷轧活套辊 |
-
2023
- 2023-05-19 DE DE102023113182.6A patent/DE102023113182A1/de active Pending
-
2024
- 2024-05-17 CN CN202480031518.3A patent/CN121194840A/zh active Pending
- 2024-05-17 KR KR1020257035984A patent/KR20250176975A/ko active Pending
- 2024-05-17 WO PCT/EP2024/063704 patent/WO2024240646A1/de not_active Ceased
- 2024-05-17 EP EP24728511.7A patent/EP4688298A1/de active Pending
-
2025
- 2025-11-18 MX MX2025013791A patent/MX2025013791A/es unknown
Also Published As
| Publication number | Publication date |
|---|---|
| KR20250176975A (ko) | 2025-12-22 |
| CN121194840A (zh) | 2025-12-23 |
| DE102023113182A1 (de) | 2024-11-21 |
| WO2024240646A1 (de) | 2024-11-28 |
| MX2025013791A (es) | 2026-01-07 |
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