EP2573260A1 - Roll and roll coating method - Google Patents

Abstract

Roller (1), which is coated with a layer that is applied by high velocity flame spraying, is claimed. The layer includes non-tempered regions beside local tempering regions and/or locally and spirally or helically arranged tempering regions. An independent claim is also included for roller coating comprising initially coating a roller surface by high velocity flame spraying, and locally tempering the layer applied by high-speed flame spraying and/or the coated surface, where the local tempering takes place spirally and/or local regions are not tempered.

Description

The invention relates to a roller coated with a high-speed flame spray applied layer and to a roller coating method.

For paper rolls, in particular for calender rolls, corresponding roll coating processes or rolls coated with a layer are known, for example, from US Pat DE 10 2008 037 999 A1 , from the DE 10 2009 045 824 A1 and from the DE 10 2008 044 369 A1 known. Here, the calender roll is first coated with an elastic layer and then applied a further layer by a high-velocity flame spraying (high velocity oxy fuel, HVOF process) on the elastic layer. In this case it can be ensured that the outer layer is on the one hand highly resistant to wear and on the other hand, a very intimate connection between the further layer and the elastic layer is ensured. In addition, high speed flame spraying, with proper process control, ensures that the sprayed material penetrates into pores or other openings on the surface of the elastic layer and then forms a closed layer which has good adhesion to the elastic layer.

In addition, it can be ensured by the high-speed flame spraying that the number of any pores, in particular on the surface of the sprayed therewith layer is minimal. This is because the impacting material drops are formed by their kinetic energy as a "pancake" or in the form of a pancake and thus form structural elements, between which, however, are found due to the high kinetic energy extremely few pores ,

The thermal spraying comprises processes for the production of layers and moldings in which pointed additives, that is to say the materials to be sprayed on, inside or outside of sprayers, are melted off or melted onto spin-coated surfaces of workpieces. The sprayed layers can be applied from spray additives in the liquid or plastic state. In this case, as a rule, the surfaces of the workpieces are not melted, so that, in particular, thermally sensitive surfaces can be reliably coated with such processes. Advantage of the thermal spraying is that the coated workpieces are heated only slightly, so that undesirable structural changes of Base material and distortion of the components are avoided. Depending on the spraying process and the spray additive, it is possible to apply different layer thicknesses, with a layer thickness of approximately 10 μm being to be used as lower limits at the present time. Conventionally produced sprayed layers are sensitive to edge pressure, point and line loads and impact stress, which is particularly due to the fact that thermal sprayed layers are stabilized substantially only due to shrinkage processes and adhesion forces between individual structural elements or to the respective substrate.

While conventional thermal spikes typically leave about 20% pore in the layer, high velocity flame spraying makes it possible to achieve layers with a 5% and lower pore fraction, particularly with 1% and less, with proper process control.

Thus, in order to reduce the high proportion of pores in conventional flame-sprayed layers, if necessary, these layers are to be thermally treated for a long time, so that the pores outgas. As a rule, a temperature in the order of magnitude of the melting temperature of the sprayed layer material must be selected for this purpose and maintained for a longer time. These relatively high temperatures together with the long thermal load time load a roll body or lying under this flame-sprayed layer layers considerably what just looking to avoid the above-mentioned documents by the high-speed flame spraying.

But the sprayed in high-speed flame spraying patties or structural elements also adhere only to shrinkage and adhesion forces with each other and the underlying layer of the roll surface, so that existing in conventional thermal spraying sensitivities with respect to the edge pressure, sensitivities at point and line loads and sensitivities in terms of Impact stresses are present accordingly. The same applies to corrosive processes, which may be caused for example by the penetration of water or similar liquid between these structural elements.

It is an object of the present invention to provide a generic roller and a generic roller coating method, which do not have a sensitive coating.

As a solution, a roller and a roller coating method having the features of claims 1 and 6 are proposed. Further advantageous embodiments can be found in the subclaims and the following description.

Thus, a roller coated with a high-speed flame spray applied layer may be characterized in that the layer has non-annealed areas adjacent to local annealing areas and / or local, spiral or spirally arranged annealing areas. As a result, certain inherent elasticities can be left in the layer, as a result of which the layer as a whole remains less sensitive.

Accordingly, a roll coating process in which a roll surface is first coated by means of high-speed flame spraying, wherein the layer applied by means of high-speed flame spraying and / or the coated surface are then locally tempered, can be characterized in that the local temperature control is spiral or in a spiral arrangement and / or local Areas are not tempered

Depending on the specific application of the roller, the spiral-shaped annealing areas make it possible to have certain regulating effects on the position of a material conveyed by the roller or passing past the roller, such as a paper web, although the actual layer does not have any unevennesses that are significant in the required smoothness of the layer need to have. Thus, for example, in the direction of rotation of the roller to the left running spiral exert a force to the left of the roller on the material, which can be used with appropriate design of all components for straightening or smoothing operations.

In particular, when the spiral annealing areas comprise at least two counter-rotating spirals, spreading effects or centering effects can be exerted by the spirals on the material, in particular on a paper web.

In the present context it should be emphasized that the local spiral annealing areas need not be continuously formed as a spiral. Rather, it is also possible to arrange a plurality of individual local annealing areas on, next to and above one another or overlapping, that on average follows a spiral basic structure of the layer, which consists of local spiral annealing areas. Likewise, several rectified spirals or a multi-start spiral can be provided.

At least one of the non-annealed areas may be enclosed by the local annealing areas arranged next to it, so that ultimately the non-annealed area is protected by them and nevertheless allows a corresponding coupling between the local annealing areas.

Preferably, one of the non-annealed areas may be located at an edge of the layer, where possibly a not so strong stress of the layer is to be found and possibly a temperature even adverse effects, such as excessive thermal stress on an edge located at the edge, would require.

In particular, in a roll coating process, irrespective of the other features of the present invention, a roll surface may first be coated by high speed flame spraying and the roll coating process characterized by subsequently tempering the layer applied by high velocity flame spraying and / or the coated surface.

Due to the high-speed flame spraying, the number of pores can be minimized, which already according to the task ensures a more stable compared to conventional flame spraying layer, in particular against corrosive effects of water or the like. The adjoining tempering, which at first appears to be contradictory in view of the low pore density and the already very compact layer, also requires that the structural elements or piles of the layer applied by means of high-speed flame spraying be metallurgically bonded to one another or to the roll body or the coated surface , This can be tempered, especially at much lower temperatures and possibly also for a much shorter time, which is much more gentle on the material.

In this case, the tempering preferably takes place in such a way that the structural elements are connected to one another or to the roll body via a diffusion layer.

To minimize the thermal load of the roll body or the coated surface, it is advantageous if it is tempered locally. In this way, the total, registered in the roller energy can be minimized, so that still too high a thermal load on a coated surface or the entire roll body can be avoided.

It is understood that, independently of the other features of the present invention, a roll coating method is advantageous in which a roll surface is first coated and which is characterized in that the layer and / or the coated surface are subsequently tempered locally. In particular, it is conceivable that in this way also with conventional flame spraying or otherwise coated surfaces can be treated accordingly, for example, expel pores. It can be assumed that, even if the layer liquefies locally or is heated locally for a long time, the total amount of energy can still be chosen sufficiently low so as not to adversely affect the roll body or the coated surface. On the other hand, it is understood that the above-mentioned advantages can be implemented cumulatively in the case of a layer coated by means of high-speed flame spraying, in which case the energy quantities do not have to be selected so high, in particular because of the resulting low pore density, that, for example, also outgas pores.

In the present context, the term "tempering" refers to a targeted heat treatment after the respective application of the layer or after the flame spraying or high-speed flame spraying. Here, the tempering can be done globally by subjecting the entire roll to a heat treatment. If necessary, care must be taken to ensure that the temperature introduced does not become too great, as a result of which the coated surface or the roller body suffers. If the targeted heat treatment is carried out locally, it may be possible to work with higher energy densities, as long as the total energy is also chosen such that the roll body or the coated surface does not suffer.

In particular, electron beams, lasers, induction coils, flames and / or microwaves are suitable as heat sources for local temperature control. Depending on the specific process control, by focusing or by selecting suitable interaction mechanisms, only or essentially the coated surface can be locally tempered, if this appears to be necessary for good metallic bonding of the structural elements or slabs to the coated surface. Possibly. can also be used from the outgoing heating to temper the overlying layer accordingly and to produce a metallurgical connection of the structural elements or flat with each other. On the other hand, an interaction process or a focusing can be selected, which acts only on the layer that has been applied as a coating, where appropriate, a heating to the coated surface is sought in order to ensure a good metallurgical connection there.

In addition, local temperature control has the advantage that the heat sources used for this purpose can generally be controlled much better in terms of their temperature response and also with regard to their energy input into the applied layer or roller, so that, in particular, if necessary, also a local melting, which occurs in usually temperature variations above 5 ° C not tolerated, can be provided.

In addition to flame spraying and high-speed flame spraying, cumulative or alternatively laser spraying processes may also be used.

In particular, if it is tempered locally, a melting of the applied layer can also take place. Appropriate further measures can be used to avoid and / or minimize the effects of any processes that occur uncontrollably or lead to uncontrollable results. For example, a sufficiently small area may be melted so that adhesion and cohesive forces hold the molten layer in place. In particular, separate local areas, ie areas spatially limited on all sides, can each be melted one behind the other, so that a region that has once been melted can only harden again before an area adjacent to or overlapping it is melted. Likewise, the roll to be tempered accordingly can be aligned in such a way that the temperature-controlled area is at the top so that flow processes or droplet formation can be avoided.

However, it is preferred to temper the applied layer without melting, so that the thermal load of the roller body or the coated surface is reduced to a minimum. This is particularly advantageous when it has been coated over a high-speed flame spraying method or a comparable method, so that from the outset with a very small number of pores is to be expected. By tempering preferably only surface effects between the individual structural elements or pancakes and / or between the structural elements or pancake and the coated surface are effective, which consequently leads to a better connection, in particular to a metallurgical connection.

In particular, it may be advantageous to select the temperature in such a way that diffusion processes take place relative to the structural elements with one another or else between the structural elements and the roll body or the coated surface. These lead to a particularly intimate metallurgical connection, so that the coating can be made substantially more stable without unnecessarily increasing the thermal load.

It should be noted that such diffusion processes or similar migratory or exchange process are usually time and temperature dependent. In this respect, lower temperatures may result in a similar result over a longer period of time, as with higher temperatures and shorter times. Here it is important to find an optimum, taking into account the materials used, in particular taking into account the sensitivity of the roll body.

While it is also readily possible to prevent melting of the applied layer at higher temperatures, by introducing the appropriate amount of energy for a limited time in the layer or in the coated surface, the process management is simplified when the temperature is made below the melting temperature , This requires in particular that the risk of overloading of the roll body or the coated surface can be reduced to a minimum. In addition, it is then easy to temper for a long time, so that the metallurgical connection or the diffusion processes have sufficient time to form.

The tempering is preferably carried out at least 1.5%, preferably at least 2 or 3% below the melting temperature of the applied layer to ensure that melting does not occur even in smaller areas.

According to the above-described roller coating method, a roller coated with a layer is correspondingly advantageous, which is characterized in that the layer has local annealing areas. If tempering is effected locally, be it by webs, for example, by guiding an induction head, an electron gun or a microwave radiator around a roll in a line-like manner, then tempering which places little stress on the roll body or the coated surface can be ensured. The same applies if a corresponding energy source is traversed to different locations. In such a procedure, transition structures are formed in the crystal structure of the tempered layer at the edge of a respective region which is swept by the energy source, in which the diffusion processes have taken place less or more excessively or in which structural transitions are to be found. Such transition regions define in the manner of a border in each case an annealing region and are accordingly an indication that was tempered locally according to the above-described roller coating process.

Precisely because of the local tempering ranges or because of the local tempering, the present invention is particularly suitable for large rolls, ie for rolls whose shell length is 2.5 m and / or whose diameter exceeds 350 mm. Due to the local temperature can be dispensed with correspondingly large ovens, in which such rolls would otherwise be tempered. The very gentle coating, in particular by high-speed flame spraying in conjunction with relatively low tempering temperatures or in conjunction with local tempering, makes the present invention particularly suitable for hollow rolls, that is to say for rolls which are not solidly formed. This suitability applies in particular to thin-walled hollow rolls in which the wall thickness of the roll mantle is less than 10%, preferably less than 5%, of the roll diameter. Straight hollow rollers and in particular thin-walled hollow rollers but also other large rollers tend to distort too much thermal stress. This can be successfully avoided by the present invention.

Accordingly, the present invention is particularly suitable for paper and / or film rolls, which often have to have a micrometer-precise surface at 10 meters or more in length. In particular, for veneer or suction rolls present invention can be advantageously used.

The coated surface is preferably made of an iron-based alloy, ie iron, steel, stainless steel, cast iron, gray cast iron or chilled cast iron.

In particular, alloys based on nickel with Fe, Cr, B, Si and C are suitable as a layer which is or is applied to the coated surface. Likewise, Co or Fe can also be used cumulatively or alternatively to Ni. Here, C usually serves as an additive for the hardness, while B and Si lower the melting temperature. Preferably, the material compositions of the layer are chosen so that it is harder than steel and have a lower melting point than the material of the coated surface, in particular therefore, for example, as steel. For example, the melting point of steel is on the order of 1,500 ° C, while the above-mentioned Ni-base alloys have melting points between 950 ° C and 1050 ° C and Fe / Co based melting points between 1050 ° C and 1150 ° C exhibit. In this respect, there is sufficient room to work, if necessary, by further additions or other combinations even with even higher-melting material compositions. It is understood that instead of such alloys, other solder materials and other coating materials can be used and tempered accordingly. In particular, hard phases, in particular hard materials, As hard metals, non-melting nitrides, carbides and oxides or ceramics are accordingly used as components, fillers or as a layer as such.

It goes without saying that a local temperature control can also be advantageous when using conventional brazing materials and leads to a non-excessive stress on the roll body or the coated surface.

It should be noted in this connection that such a coating does not have to be provided on the entire roller. Rather, it is also conceivable to coat or temper selected or heavily loaded areas accordingly. In particular, it is also conceivable, for example, to coat a roll with high-speed flame spraying per se in a conventional manner and then only subject the edges of the roll to the above-described tempering processes. In practice, it has been found that often the two roll edges are subject to extreme loads and that there is a considerable risk that corrosion, starting from the roll edges, engages in the interior of the roll. By local temperature only at the edge or by a corresponding coating only at the edge of this disadvantage can be met, especially if otherwise the high-speed flame spraying or otherwise applied coating for the particular application is sufficiently stable.

The material used for the layers are preferably alloys with a significantly lower melting point than the melting point of the surface to be coated for use. For example, alloys having a melting point of approximately up to 1000 ° C can be applied to iron-based roll bodies having melting points of approximately up to 1500 ° C, and it has been found that even at tempering temperatures between 700 ° C and 800 ° C Connection of the structural elements with each other or with the roller body can be ensured, in particular at lower temperatures or - depending on the alloy - at 700 ° C possibly a relatively long time has to be waited until sufficient diffusion processes have taken place, while at higher temperatures - depending on the alloys used - already a little over 700 ° C, especially from 750 ° C, the diffusion processes already take place on acceptable time scales.

Accordingly, a roller coated with a layer applied by means of high-speed flame spraying is advantageous with respect to insensitivity of the layer, which is characterized in that the layer has tempering ranges. As As already explained above, there is no reason in the prior art to temper a layer applied by means of high-speed flame spraying. With such a tempering process, however, the connection of the structural elements with one another or with a roller body can be improved so that it builds the entire layer substantially more stable. It is understood that on the one hand it is conceivable to appropriately temper the entire roll in one step if the layer has been applied by means of high-speed flame spraying. However, even after such an application, local tempering with correspondingly locally limited annealing areas is particularly preferred, since warping can be minimized, particularly in the case of large or hollow rolls, especially in the case of thin-walled hollow rolls.

While already short-term heating ultimately improves the connection between the individual structural elements or flat with each other or with the roll body, it is advantageous if the temperature is sufficiently long or at sufficiently high temperatures that between the structural elements with each other or between the structural elements and the roller body, a diffusion layer is formed, resulting in a very good connection. Accordingly, the object stated at the outset also solves a roller coated with a layer applied by means of high-speed flame spraying, which is characterized in that the layer has structural elements which are connected to one another or to a roller body via a diffusion layer.

In this context, it should be mentioned that such a diffusion layer does not necessarily have to be found continuously in all areas of the layer. Rather, it is important in the result that the layer for the purpose of the roller is sufficiently strong. It is also conceivable that the layer at least locally completely melts on annealing, it being assumed that this local melting is ultimately still so low in its entirety that thereby the roll body or the coated surface is not or only insignificantly disadvantageous is influenced or warped.

In particular, by a local melting but also by the high-speed flame spraying or possibly by other processes, such as application under vacuum, the number of pores in the coating or in the layer can be reduced to less than 10%, preferably to less than 5%. Such a low pore density makes corrosive attacks much more difficult to apply to the layer. In particular, such a low pore density necessitates that an excellent roll surface be made available even if the coating has been regrind several times which is particularly important for the paper and / or film industry.

In order to reduce the risk of warping the roller in spite of the measures described above, it may be advantageous to temper the roller in advance in a conventional manner, and this form tension-free, in which case optionally post-processing, in particular a subsequent judge and balancing must be done.

It is understood that the features of the solutions described above or in the claims can optionally also be combined in order to implement the advantages in a cumulative manner.

Figur 1

eine beschichtete Hohlwalze in schematischen Schnitt;

Figur 2

eine Detailvergrößerung der Ansicht nach Figur 1 nach einem Auftrag einer Schicht mittels Hochgeschwindigkeitsflammspritzen;

Figur 3

die Anordnung nach Figur 2 nach einem Tempervorgang;

Figur 4

eine schematische Sicht auf die Anordnung nach Figur 3;

Figur 5

eine schematische Aufsicht auf eine zu der Anordnung nach Figur 3 in Schnittdarstellung identische Anordnung;

Figur 6

eine mit spiralförmigen Temperbereichen beschichtete Walze in schematischer Seitenansicht;

Figur 7

eine Detailvergrößerung einer Schicht in ähnlicher Darstellung wie Figuren 2 und 3 mit einem nicht-getemperten Bereich; und

Figur 8

eine schematische Detailvergrößerung eines mit einer Schicht beschichteten Walzkörpers, der eine Öffnung aufweist, mit einem nicht-getemperten Bereich.

Further advantages, objects and features of the present invention will be explained with reference to the following description of exemplary embodiments, which are shown in particular in the appended drawing. In the drawing show:

FIG. 1

a coated hollow roller in a schematic section;

FIG. 2

an enlarged detail of the view FIG. 1 after application of a layer by means of high-speed flame spraying;

FIG. 3

the arrangement after FIG. 2 after a tempering process;

FIG. 4

a schematic view of the arrangement according to FIG. 3 ;

FIG. 5

a schematic plan view of a to the arrangement according to FIG. 3 in a sectional view identical arrangement;

FIG. 6

a coated with spiral annealing areas roller in a schematic side view;

FIG. 7

a detail enlargement of a layer in a similar representation as FIGS. 2 and 3 with a non-annealed area; and

FIG. 8

a schematic detail enlargement of a layer-coated rolling body having an opening, with a non-annealed area.

In the FIG. 1 shown roller 1 has a roller body 10, which is formed by a tube 12 and two laterally attached end support 14, which are configured disk-shaped and are connected via welded joints 18 to the tube 12. At the end supports 14 each have a roll neck 16 is welded, so that the roller 1 can rotate in a corresponding fishing.

As can be seen immediately, the roller 1 is thus designed as a hollow roller, wherein - depending on the concrete implementation of such a roller - and a plurality of carriers which are similar to the end brackets 14 may be provided in the interior of the tube 12. Likewise, it is not absolutely necessary that the cavity of the hollow cylinder is sealed, as is the case in the present embodiment. Also conceivable are open to the outside roll body. Similarly, internally provided carriers can be opened, i. only as a scaffold, be formed. The roll 1 is 3 m long and has a diameter of 300 mm with a wall thickness of the tube 12 of 5 mm. Accordingly, the roll 1 is also a hollow roll or thin-walled large roll.

The surface 19 of the roller body 10 or of the tube 12 is coated with a layer 20. This is done in the present embodiment via high-speed flame spraying, so that the coating consists of individual high-speed flame-sputtering flat 22, which form individual structural elements 23 of the layer 20, in particular in FIG. 2 shown schematically.

In the present embodiment, the tube is made of iron, while the layer of a nickel-based alloy with Fe, Cr, B, Si and C as alloying additives.

It is conceivable to appropriately temper the entire roll 1 in order to achieve metallurgical bonding of the structural elements 23 to one another or to the coated surface. In the present embodiment, however, takes place a local temperature, the adjacent temperature control zones 24, which are separated by transition regions 25 from each other, as in Figures 3 and 4 and 5 are shown schematically. Naturally, the transition regions 25 have a complex structure that is characterized by local temperature-control zones 24 adjoining each other. In this case, twice as intense diffusion regions between the structural elements 23 with one another or with the coated surface 19 may be present in the transition regions 25 if a sufficient overlap of the respective temperature control zones 24 has been selected. In particular, it is also conceivable that in these transition regions 25 melting is to be found increasingly, if adjacent tempering zones 24 have been tempered in quick succession. On the other hand, the tempering zones 24 are often tempered with energy densities having a bell curve or Gaussian distribution curves or the like with energy densities decreasing towards the edge. This can lead to less intensive diffusion regions between the structural elements 23 and to the coated surface 19 being present in the transition regions 25. Likewise, in these Transition regions 25 also be no sufficient temperature control to achieve a sufficiently detectable diffusion layer, but this is not critical, as long as such areas are sufficiently small and the stability of the layer 20 overall meets the desired requirements and has been sufficiently stabilized. Preferably, work is done with transition areas 25, which are between 0.1 mm and 3 mm, in particular between 1 mm and 2 mm, which ultimately depends on the accuracy of the management of the energy sources used for temperature control.

Here, in the present exemplary embodiment, the tube 12 is locally heated by means of an induction head on its surface 19, so that diffusion processes take place between the coated surface 19 and the structural elements 23. The heating takes place here at about 800 ° C to 900 ° C, the width of the Temperierungszonen 24 in FIG. 4 or the smaller main axis of the Temperierungszonen 24 after FIG. 5 is about 10 mm. In other embodiments and process guides, the width or minor major axis of the tempering zones 24 may be between 5 mm and 30 mm, depending on the desired energy densities, the spatial dimensions of the bodies 10 and the materials used, and the desired processing speeds. In this way it can be ensured that both the layer 20 and the coated surface 19 and the entire roller body 10 are not subject to high thermal loads. It is understood that instead of in the inductive heating in particular, a heating by means of microwaves or by laser is conceivable, which on the one hand depends on the materials and their interaction in the respective energy source and on the other hand on the depth at which the heat is to be applied.

It is further understood that the thickness of the diffusion layer between the structural elements 23 with each other or to the coated surfaces 19 may be different intense or thick pronounced or that in some areas no such diffusion layers are to be found, which in particular of the time and Frequency with which these were tempered depends. Likewise, it can happen that smaller areas completely melt, which is ultimately not necessary in itself and can involve the risk of excessive thermal stress in itself.

It is understood that instead of a high-speed flame spraying method, other coating processes can also be provided insofar as they are subject to local temperature control.

In the FIG. 6 shown roller has spiral-shaped annealing areas 27, the 26 formed by appropriate local annealing areas Temperierungszonen 24 similar to the arrangement according to FIG. 4 2, which form two counter-rotating spirals 30, 31. Depending on the direction of rotation, the roller 1 can after FIG. 6 Centering in the middle or wide spreading from the center out on a paper web or other material on the roller 1 passing material act. It is understood that non-spiral, for example, substantially point, circular, or elypsoid-shaped local annealing 26, which are arranged with a spiral-shaped basic structure on the roller 1, such spiral annealing 27 and corresponding spirals 30, 31 can provide.

As in FIG. 7 not shown, the entire layer 20 need not be continuously tempered. Rather, it is also possible to provide non-tempered regions 28, as illustrated by the example of an opening 32 in the roller body 10, which can be arranged, for example, in the region of an edge 29, which revolves around the opening 32. Here, the transition between non-tempered region 28 and local annealing regions 26 is already flowing due to heat-conducting effects.

In the region of the edge 29 around the opening 32, the layer 20, as in FIG. 8 illustrated by way of example, extend into a chamfered region of the opening 32. During tempering, this region can leave a focus of a laser or a tempering zone conditioned in some other way, so that there is no longer sufficient heat input and in the region of the edge 29 a non-tempered region 28 follows, which is surrounded by annealing regions 26.

LIST OF REFERENCE NUMBERS

1

roller

10

roller body

12

pipe

14

end beam

16

roll neck

18

Welded connection (numbered as an example)

19

coated surface

20

layer

22

Hochgeschwindkeitsflammspritzen- (HVOF) -Fladen

23

structural elements

24

Tempering zone (numbered as an example)

25

Transition area (exemplified by number

26

local annealing range

27

spiral annealing area

28

non-tempered area

29

Randung

30

spiral

31

spiral

32

opening

Claims (9)

Roller coated with a high-speed flame spray applied layer, characterized in that the layer comprises non-annealed areas adjacent to local annealing areas and / or local, spiral or spirally arranged annealing areas. Roller according to claim 1, characterized in that the layer has less than 10% pores. Roller according to claim 1 or 2, characterized in that the spiral-shaped annealing areas comprise at least two opposing spirals. Roller according to one of claims 1 to 3, characterized in that at least one of the non-annealed areas is enclosed by the local annealing areas arranged next to it. Roller according to one of claims 1 to 4, characterized in that at least one of the non-annealed areas is disposed at an edge of the layer. Roll coating method in which first a roll surface is coated by means of high-speed flame spraying, wherein the applied by means of high-velocity flame spraying layer (20) and / or the coated surface (19) are then locally tempered, characterized in that the local temperature control is spiral and / or local areas not be tempered. Roll coating method according to claim 6, characterized in that is tempered without melting the applied layer. Roll coating method according to claim 7, characterized in that the temperature is made below the melting temperature. Roller coating method or roller according to one of the preceding claims, characterized in that a large roller and / or hollow roller, in particular a Veneer roller, a suction roll, a paper or foil roll, is coated or is accordingly.

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