WO2000005063A1

WO2000005063A1 - Method for producing press rolls or ring liners or ring segments for press rolls

Info

Publication number: WO2000005063A1
Application number: PCT/EP1999/005259
Authority: WO
Inventors: Werner Plagemann; Wolfgang Schütze; Werner Theisen
Original assignee: Maschinenfabrik Köppern Gmbh & Co. Kg
Priority date: 1998-07-24
Filing date: 1999-07-22
Publication date: 2000-02-03
Also published as: AU5506699A; DE19833456A1

Abstract

The aim of the invention is to simplify a method for producing press rolls, or ring liners or ring segments for press rolls which have at least one cooling channel for dissipating heat. To this end, the one or more materials immediately surrounding the at least one cooling channel are welded together at least in some areas by means of a hot compacting process. The invention also relates to the press rolls or ring liners produced according to this method.

Description

Process for producing press rolls or ring bandages or ring segments for press rolls

The present invention relates to a method for producing press rolls or ring bandages or ring segments for press rolls which have at least one cooling channel for removing heat. The invention further relates to a press roll produced by this method

In particular, if press rolls of, for example, roller presses are used for briquetting, compacting and comminuting hot feed materials, high thermal loads occur in addition to the high mechanical stress. The feed materials have temperatures of up to about 1000 ° C. or even higher For reasons of cost, wear-resistant ring bandages or ring bandages consisting of ring segments are used, which can be easily replaced in the event of wear. When processing hot feed materials, cooling must be provided which effects heat dissipation in the loading zone as effectively as possible Applying a ring bandage or the outer surface of the basic roller body This sometimes leads to problems with the shrink fit, especially when the bandage is renewed several times. Furthermore, corrosion in the shrinkage caused by the spiral grooves sometimes sit for leakage

A ring bandage made of a highly wear-resistant steel alloy is known from US Pat. No. 4,019,846, which is pushed onto a basic roller body by means of a press fit and has cooling channels parallel to the axis approximately in the middle of its thickness radial bores, which in turn are connected to an inner deflection ring or distributor ring. The inner deflection ring or distributor ring directs the coolant radially outward parallel to the end faces of the basic roller body and is connected to a channel in an outer deflection ring or distributor ring via metal bellows, which is assigned to the end face of the ring bandage and has channels in its interior that guide the cooling medium to the axially parallel cooling channels in the ring bandage The arrangement is such that the deflection or distributor ring on one end side supplies the cooling medium to the axially parallel cooling channels and the Deflection or distributor ring The cooling medium returns on the other end face. Such a configuration largely eliminates the problems in the area of the shrink fit between the basic roller body and the ring bandage

Furthermore, ring bandages or ring segments forming them are known which have a metallic ring base body, on the outer surface of which a highly wear-resistant layer made of a powder metallurgical material is applied. Such layers are preferably applied by a hot isostatic pressing process, so that diffusion welding of the base band body to the powder metallurgical material takes place

It is now the object of the present invention to provide a method for producing press rolls or ring bandages or ring segments forming them, by means of which cooling channels can be introduced into the press rolls or ring bandages or ring segments in a relatively simple and inexpensive manner. The press rolls or ring bandages thus produced are said to be one have very effective cooling, which may allow the use of less heat-resistant materials

This object is achieved in that one or more material (s) immediately surrounding the at least one cooling channel is or are welded together, at least in regions, by a hot compaction process

Such a procedure opens up completely new design possibilities for cooling channels, since their final shape is only determined by the hot compacting process. It is particularly advantageous that the cooling channel is no longer arranged in the area of a shrink fit, so that the problems existing in the prior art cannot occur In the hot compacting process, solid materials made of suitable materials as well as powder-metallurgical materials can be welded together.Another advantage is that the cooling channels can be arranged completely inside the press roll or a ring bandage and only the connections need to be accessible from the outside. The course of the cooling channel inside the press roll or ring bandage can then be made as desired. In addition, there is an additional advantage that the entire cooling channel is surrounded by a welded, one-piece structure, so that leakage, such as in the area of a Shrink fit, can not occur at all The structure surrounding the at least one cooling channel can preferably be composed of at least two individual bodies to form a ring bandage or ring segment blank ^* , the individual bodies being welded together by the hot compacting process. Both solid compact bodies and individual particles of a powder metallurgical material are to be regarded as individual bodies Using larger single bodies, the joint surface of these individual bodies can be designed in such a way that the cooling channel is advantageously incorporated in this area and the cooling channel is closed by assembling the individual bodies and then welding by hot compacting. When using ring bandages, the cooling channel is also located in the area Distance to the press fit, which avoids the known problems

In addition, by providing a powder-metallurgical material during the hot compaction process, a high-strength powder-mechanical wear layer can be formed on the outer circumference of the ring bandage or the ring segment blank. The advantage can then be seen that both the production of the powder-metallurgical wear layer and the final shaping of the cow channel in one work step It is therefore not necessary to weld separately to close the cooling channel

In a variant of the method it is provided that at least one shaped body is provided, the at least one shaped body is embedded in a powder metallurgical material, the powder-mechanical material is shaped together with the at least one shaped body to form a ring bandage blank or ring segment blank, so that at least one outer surface of the at least one shaped body in some areas the inner contour of the at least one cooling channel is formed, and the powder-metallurgical material is subjected to a hot compacting process in order to produce a solid workpiece

Such a solution treads a completely new path because, up to now, the cooling channels have always been arranged in a ductile ring bandage or a basic ring bandage body - was ring. Obviously there was a prejudice in the prior art that these wear layers are not suitable for the introduction of cooling channels. On the one hand, there is a particularly high temperature and an extremely high load ^* in this area, so that the idea of weakening the cross-section of this layer leads entirely away from the concepts previously used.

This process variant has a number of advantages. On the one hand, cooling channels of any shape can be created, since the shaped bodies can be of any shape and the cooling channels take on a corresponding shape. Furthermore, no material is lost, as in the previously used manufacturing processes. Only as much powder-detailed material is required as is necessary for the corresponding contour design. Reworking to achieve the cooling channel shape is not necessary in most cases. The subsequent machining of such ring bandages for the production of cooling bores has always been a not negligible cost factor. The introduction of the cooling channels in the powder metallurgical material has the additional advantage that in most embodiments the cooling channels are located near the surface of the roller and thus cooling is carried out in the immediate vicinity of the load area. This makes it possible to use less heat-resistant and therefore inexpensive powder-metal materials under unchanged working conditions. However, it is also possible to process feed material at higher temperatures when using the same powder metallurgical material.

Contrary to general expectations, tests have shown that ring bandages produced in this way have sufficient strength, although the cross section of the powder-metallurgical composite material is somewhat weakened by the introduction of the cooling channels. The powder-metallurgical layer did not flake off, particularly if it had been applied to a ductile bandage base body.

The at least one shaped body can advantageously be further embedded in the powder metallurgical material during the hot compacting process. This procedure is particularly advantageous in embodiments in which the moldings remain in the composite material. In a preferred process variant, it is provided that the puivermetailurgische material together with the at least one shaped body and / or trohlmgs arranged with the at least two Einzelkorpern for molding the Ringbandagenrohliπgs or Ringsegmen- ^* in a form of capsule and subjected in this Formkapsei a heißisostati-'s pressing operation A The hot isostatic pressing process (HIP process) is best suited for the production of a composite material or the welding of even larger individual bodies for the load trap present. This allows a wide variety of materials to be brought into a sufficiently dimensionally stable and dimensionally stable shape

Another variant of the method provides that a metallic base body is provided, on which the powder-metallurgical material is applied as a layer and a connection between the powder-metallurgical material and the metallic base body takes place by means of the hot compacting process. It should also be noted that this metallic base body is also a component the capsule can form

The powder metallurgical material can be applied to the metallic base body in powder form or as a pre-pressed solid. The form in which this ultimately happens depends on the individual case and the solution that is favorable for the selected material and the desired bandage shape. The base body and the powder metallurgical material are then used in the hot compaction process connected with each other by diffusion welding and form a very stable connection. As the cooling effect takes place in the powder metallurgical layer, the interface between the metallic base body and the wear layer is cooled sufficiently so that different thermal expansions of the layer and base material do not lead to thermal stresses and layer detachments can drive

Another advantage arises when the at least one shaped body is arranged on the basic body before the powder metallurgical material is applied. The shaped bodies can therefore be placed and aligned in any way on the basic body. This also has the advantage that the cooling channels m of the finished bandage are then located directly at the interface between the base body and the powder metallurgical material. Since the molded bodies are freely accessible and can be placed on the outer surface of the base body, there is a considerable process Simplification, since, for example, the insertion of cooling channels into the inside of a hollow body is much more difficult

Under certain circumstances, the at least one molded body can only be used as a molded core, so that it is removed again after the hot compaction process

In particular, according to one variant, a molded body is suitable which has at least one ceramic surface or is made entirely of ceramic. The powder metallurgical material does not form a connection with a ceramic surface, so that the molded bodies can be removed relatively easily, in particular mechanically

A similar effect can be produced in that the shaped body has at least one glass surface or is made entirely of glass

In the case of certain materials, the at least one shaped body can be removed by a chemical process. This is particularly useful in the case of complicatedly designed cooling channels

One possibility is, for example, that a shaped body made of glass is removed by a leaching process

However, shaped bodies which are designed as hollow bodies can also be used. These are then flooded with a pressure medium during the hot compacting process (for example HIP process) so that they do not collapse

A preferred pressure medium is an inert gas, preferably argon, which is usually used in the HIP process

The method can also be further developed in that at least one first basic body is produced, onto which at least a second basic body is slid, the at least regionally adjacent surfaces of the basic bodies being designed to form the at least one cooling channel and the basic bodies by the hot compacting process for forming the cooling channel be welded together inside The use of larger basic bodies, in which the contour of the cooling channel is already formed, the final sealing of the cooling channel except for the connections being done by the hot compaction process, is an easy-to-use variant that can also be carried out with relatively inexpensive materials

The invention also relates to a press roll with a ring bandage or ring segments, which is or are produced by a method according to one of claims 1 to 18.The at least one cooling channel is at least partially completely molded into the interior of the ring bandage or ring segments, the at least a structure directly surrounding a cooling channel is made up of at least two individual bodies welded together by the hot compacting process

By using several Emzelkorper the ring bandage (or - segmeπte) can be built in any shape from these individual elements.These can be compact, larger components or individual grains of a powder metallurgical material. In any case, such a structure enables the grouping of the Emzelkorper into different shapes, so that a cooling channel enclosed by these can also have any configuration and, when the ring bandage is finished, is completely encapsulated except for the connections in it. The connection of the body parts is then carried out by the hot compacting process in which they weld to one another

The ring bandage of the press roll can be constructed from one piece or from several segments. The ring bandage preferably has a highly wear-resistant layer made of a powder metallurgical material. The at least one cooling channel can be arranged in this

As already mentioned above, cooling ducts have always been incorporated into a ductile base material. Obviously, it was assumed that the introduction of cooling ducts into the relatively brittle wear layer would have disadvantages. In addition, such wear layers have so far always been made relatively thin so that they can be inserted Cooling ducts were out of the question For cooling bandages that were made entirely from a powder-metallurgical material, no cooling was previously provided Conveniently, the high-strength layer made of the powder-metallurgical material can be applied to an annular base body and connected to it. This has particular advantages when applying the bandage by means of a shrink fit, since this can be carried out better with a ductile material. The layer thickness of the powder-metallurgical layer also needs to have only a limited thickness so that it is sufficiently stable and has the cooling channels

According to a further embodiment, the at least one cooling channel can be arranged close to the interface between the base body and the high-strength layer. As a result, not only does intensive cooling take place near the surface of the wheat, but also a sufficient cooling effect in the area of the interface between the base body and the high-strength layer, so that different thermal expansions occur cannot lead to thermal stresses and stripping from layer and base material. The base body can also be part of the wall of the cooling channels

Preferably, at least one outlet or inlet of the at least one cooling channel can be arranged on one or the face of the high-strength layer. The mostly liquid cooling medium is then supplied and removed via connections on the end face, which can be assigned to the outlet or inlet several outlets and inlets may also be provided

There is also the possibility of arranging a deflection or distributor ring on at least one end face of the ring bandage, which has or seals at least one channel, which is connected to the at least one cooling channel in the high-strength layer. The deflector or distributor (s) then usually have a single connection, and distribute the cooling medium inside such that all cooling channels in the powder-detail layer are supplied with cooling medium

One embodiment provides that several axially extending passages are provided as cooling channels, the inlets and outlets of which are coupled to one another in the end face by the channel shape in the deflection or distributor ring in such a way that a meandering cooling channel guidance is achieved and removal of the cooling medium at one and the same deflection or distribution ring. How often such a cooling duct is deflected depends on the desired heat dissipation Thus, the cooling medium does not directly with the pulvermetailurgischen material into contact in the can at least one cooling channel a with the Innenwan- ^'fertil in contact standing Kuhlmittelrohr be arranged The Kuhimittelrohr is then preferably made of a material having high corrosion resistance manufactured Such an embodiment can be used for different Powder metallurgical materials are an advantage

A particularly stable embodiment is achieved in that at least one open-pore full element is arranged in the at least one cooling channel. This open-pore full element produces a very large surface area which enables very intensive heat dissipation. The pore volume must be selected such that there is sufficient flow can be achieved with coolant In addition, such an open-pore full element usually has such a stable structure that it also has a pretending effect

Conveniently, the open-pore full element can be made of a powder-detailed mechanical material. Similar to known filter elements, such powder-powdered mechanical materials can be designed as relatively compact or stable elements. It is also possible to fill the entire cooling channel with this full element or to attach it only in sections. that this Fulleiement provides an additional support effect, a high Kompaktlerdruck can be absorbed in the processing area. This also opens up the possibility of increasing the cross section of the cooling ducts, because the structure of the full elements causes numerous supports within the duct cross section

In a further embodiment, it is provided that the at least one cooling channel is essentially completely filled with a solid body made of a material with high thermal conductivity, in particular copper, which at least on the end face is connected to the at least one channel in the area of the deflection or distributor Here, the heat is not dissipated via a medium flowing through the cooling channel, but rather through the thermal conductivity of a solid body that is arranged in the cooling channel. Because this solid body comes into contact with the cooling medium flowing in the deflection or distribution ring, the heat is removed the full body in the area of the end faces of the ring bandage instead of completely filling the cooling channel le is an extremely stable construction, which enables surprisingly good heat dissipation

Conveniently, the full body in the area of the at least one channel in the deflection or distributor ring or in the bandage shoulder can have an enlarged cooling surface.This results in a favorable heat dissipation by the cooling medium in the deflection or distributor ring, so that the full body can dissipate a large amount of heat

Another preferred embodiment, which in particular has a high stability and through which the risk of excessive thermal stress in the area of the wear layer due to the cooling effect is completely avoided, is then that at least two ring-shaped or πngsegmentformig basic bodies are arranged one above the other and the at least one cooling channel between the Basic bodies are formed and the basic bodies are welded together by the hot compacting process.An embodiment of this type is particularly suitable for load cases with high mechanical stress.Puiver-mechanical materials can also be used for the highly wear-resistant layer, which are more susceptible to high temperature jumps due to the cooling, since these are spaced apart is arranged to the wear layer

Exemplary embodiments of the present invention are explained in more detail below with the aid of a drawing

1 shows a section of a press roll with a cooled bandage in a partially sectioned front view,

2 shows a section of the bandage from FIG. 1 in a side view,

Fig. 3 shows a second embodiment of a ring bandage in a schematic

Sectional view,

4 shows a third embodiment of a ring bandage in a cross-sectional illustration, 5 shows a fourth embodiment of a ring bandage in a cross-sectional view,

6 shows the ring bandage from FIG. 3 in a representation cut along a partial circle running through the cooling channels,

7 shows the ring bandage from FIG. 4, in a representation cut along the partial circle running through the cooling channels,

8 shows a fifth embodiment of a ring bandage, which has a ductile base body, in a schematic cross-sectional illustration,

Fig. 9 shows a sixth embodiment of a ring bandage that has a ductile

Has basic body, in a schematic cross-sectional representation,

Fig. 10 shows a seventh embodiment of a ring bandage that has a ductile

Has basic body, in a schematic cross-sectional representation,

11 shows an eighth embodiment of a ring bandage which has two ductile base bodies, in a schematic cross-sectional illustration and

12 shows a variant of the cooling duct from FIG. 11.

The press roll 1 shown in FIG. 1 comprises a cylindrical roll base body 2 which has coaxial shaft journals 3 on both sides. A highly wear-resistant ring bandage 5 is shrunk onto the outer lateral surface 4. The ring bandage 5 has a cylindrical jacket-shaped inner surface 6 which is fastened to the base body by positive or non-positive connection. The ring bandage 5 shown laterally has these reinforcing bandage shoulders 7 and 8, so that it has a larger outer diameter in its central region. The cylindrical jacket-shaped outer surface 9 represents the actual roller surface. This can also be provided with mold troughs or similar profiles as required. In another embodiment, the ring bandage 5 can also consist of several segments, which are then each connected to the roller base body 2. The ring bandage 5 consists of a powder-detailed material and has been produced by a HIP process in which moldings (not shown) are embedded in the powder-detailed material during the HIP process and thus define the inner surface of cooling channels 10 in the ring bandage 5

The ring bandage 5 each has axially parallel cooling channels 10 with a circular cross section. The right end face 11 of the ring bandage 5, shown in FIG. 2, has longitudinal grooves 12 in the area of the bandage shoulder 8, which each connect two cooling channels 10. A deflection ring is on the front side 11 13, which rests on the end face 11 in a sealing manner. The deflection ring 13 is fastened to the ring bandage 5 by means of screws 14 and pins 15. Longitudinal grooves 17 are also arranged on the opposite end side 16 of the ring bandage 5, each connecting two cooling channels 10. The end face 16 sealingly covered by a second deflection ring 18, which is fastened to the annular bandage 5 by means of screws 14 In contrast to the longitudinal grooves 12 on the other side of the annular bandage 5, the longitudinal grooves 17 are offset from these, so that there is a meandering flow channel in the interplay of the cooling channels 10 and the Langsnuteπ 1 2 and 17 results (see, for example, also the embodiment of FIG. 6). The cooling medium is supplied via a cylindrical shaft bore 19 which is arranged coaxially with the press roll 1. From this shaft bore 19, a cylindrical feed bore 20 extends radially outward, from which in turn a transverse bore 21 leads to the end face 22 to the outside. A pipe connection 23 then guides the cooling medium into an opening 24 in the deflection ring 13 hm, so that it can flow into the cooling channels 10

On the other hand, the warm cooling medium is removed in the reverse order via an opening 25 in the deflection ring 18, a pipe connection 26, a transverse bore 27, a discharge bore 28 and an axial shaft bore 29. In FIG. 1, the two pipe connections 23 and are only for clarification 26 shown at the same height Normally, it must be ensured that the cooling medium flows through the entire bandage 5 before it leaves it again

When the cooling medium is supplied, access from a single side can also be used. Then, however, a pipe system in the shaft bore 19 is required

1? The production process for producing the ring bandage 5 described above is explained in more detail below.

The ring bandage 5 is made of a powder-detailing material. For this purpose, the powder metallurgical material is poured into a molded capsule, molded bodies (not shown) which define the cooling channels 10 being inserted into this molded capsule. The capsule is then completely closed and evacuated. This is followed by a hot isostatic pressing process, so that the powder-metallurgical material combines to form a solid. In the same way, ring segments for producing such a ring bandage 5 can also be produced.

The moldings used can consist of a wide variety of materials. Should the shaped bodies e.g. completely removed from the ring bandage 5, as in the previous embodiment, they are preferably made of ceramic or glass. Ceramic or glass does not bond with the powder-detailed material, which is why it is relatively easy to remove. When using glass, leaching of the molded body is also possible. Since the removal takes place chemically in this case, the cooling channels can have a wide variety of shapes.

The production of such ring bandages 5 by means of the described method permits a wide variety of shapes with the simplest introduction of cooling channels 10 and longitudinal grooves 12 and 17, without the need for subsequent machining. The introduction of such channels into a powder-detailed material has so far not been carried out in the prior art with such large workpieces. The ring bandages 5 described here partly have diameters of greater than 1 m.

Further embodiments of the invention are explained in more detail below. Insofar as these embodiments use the same or similar components as the previous embodiment, the same reference numerals are used and reference is made to the preceding description in this regard.

The ring bandage 5 shown in Figure 3 has no shoulders, so that the Umlenkbzw. Distributor rings 13 and 18 sit directly on the end faces 11 and 16. in the In contrast to the embodiment of FIGS. 1 and 2, no longitudinal grooves are incorporated in the ring bandage 5. Rather, they are located in the deflecting or distributing rings 13, 18, see FIG. 6

FIG. 4 again shows a cross section through an annular bandage 5 which has bandage shoulders 7 and 8. This embodiment is also provided with deflection or distributor rings 13 and 18, each of which sits sealingly on the end faces 11, 16. The deflection or distributor rings 13 , 18 have on their inside circumferential annular grooves 30, 31, which distribute the cooling medium over the entire front area of the bandage 5 covered by the deflecting ring 13, 18, see FIG. 7

A further embodiment is shown in FIG. 5. This again has longitudinal grooves 12 and 17 in its bandage shoulders 7 and 8. Instead of deflecting or distributing rings, the longitudinal grooves 12 and 17 are closed with welded-in cover plates 32, 33. The coolant is guided similarly to the embodiment of Figures 1 and 2 meandering

In the embodiments of FIGS. 4 and 5, a coolant supply or removal is again provided at a suitable point

In the following, exemplary embodiments are described in which the ring bandage 5 applied to the roller base body 2 consists of a ductile, cylinder-shaped bandage base body 34 and a wear-resistant ring 35 firmly connected to this. The wear-resistant ring also has a cylindrical sleeve shape and is made of the powder-detail material In Embodiments of Figures 8 to 10, the ring 35 has mold troughs 54 in its outer surface 9 for the production of briquettes

In the embodiment of FIG. 8, a spirally wound tube 36 has been wound on the outer surface of the basic bandage body 34. This tube 36 is essentially completely embedded in the powder-detailed material of the ring 35 and extends laterally out of the end faces 37 and 38 of the ring bandage 5 of the cooling medium takes place via a tube 39 arranged in the shaft bore 19 and radially outwards via the tube connector piece 40, which in turn is connected to the tube 36. The tube 36 lies over the entire surface of the inner wall of the cooling channels 10 in the ring 35 on the other end 37 of the ring bandage 5, the cooling medium is discharged radially inward via the pipe connector piece 41 into the shaft bore 19 of the basic roller body 2

Such a ring bandage 5 is produced by winding a tube onto the basic bandage body 34 and then arranging the basic bandage body 34 together with the tube 36 in a molded capsule. This capsule preferably consists of sheet metal and can also be placed on the basic bandage body 34, the Bandagengrundkorper 34 forms part of the encapsulation At the same time, a powder-metallurgical material is poured in, which is placed around the tube 36 in such a way that it is embedded in the powder-detailing material. The capsule is then evacuated. The tube 36 is flooded with argon during the HIP process This is followed by a hot isostatic pressing process in which the powder metallurgical material binds to the basic body of the drum 34 by means of diffusion welding. The tube 36 does not collapse due to the flooding with argon

It should be noted at this point that an annular bandage 5 consisting of basic bandage body 34 and ring 35 can also be produced by means of molded bodies which are subsequently removed again

One advantage of this embodiment is that the cooling action unfolds in the vicinity of the outer surface 9, which is why less heat-resistant powder-metal materials can also be used. In addition, cooling takes place in the interface area between the basic bandage body 34 and the ring 35, which is why it is caused by the different thermal expansion of the material of the ring 35 and the material of the basic bandage body 34 does not lead to thermal stresses and delamination

Water is preferably used as the cooling medium, but gases can also be used in addition to other fluids

The exemplary embodiment according to FIG. 9 differs from the previous exemplary embodiment in that open-pore full elements 42 are used as shaped bodies, which remain in the ring bandage 5. These are connected to one another via channels 43. The exemplary embodiment shows three spaced apart designated annular Full elements 42 of a pulvermetailurgischen material and having a predetermined pore volume This Full members 42 are similar to powder metallurgy filter constructed and can be flowed through by the cooling medium This ^* can be excellently to the pulvermetailurgischen material of the ring 35 connect the Full elements 42 but may also be a wide variety of other configurations, in particular having shapes. One advantage of this embodiment is that the cooling channels 10 are filled with the full elements 42. The full elements 42 then additionally provide a support structure, as a result of which high pressure loads can also be borne in the cooling channel area

When producing such an embodiment, the full elements 42 are preferably also flooded with argon so that they do not collapse during the hot isostatic pressing process

In the embodiment according to FIG. 10, the cooling channels are completely filled with a thick copper wire 44, which is wound in a spiral around the basic bandage body 34.Copper is a material with very good thermal conductivity, so that the copper wire 44 is able to transfer the heat to the outside The copper wire 44 is connected at the end faces of the ring 35 directly to large-area copper elements 44, which have an outer surface 46, each of which points to an annular groove 30 or 31 in the deflecting rings 13. The outer surface 46 of the copper elements 45 is thereby directly present in contact with the cooling medium in the deflection rings 13, 18. The deflection rings 13, 18 each have an inlet and outlet since the cooling medium does not flow through the ring 35 in this embodiment

The use of a powder-detailed material and moldings, which are embedded in them during manufacture, allows an incredible variety of different possibilities for the design of the cooling channels 10. The preceding exemplary embodiments can therefore not be considered exhaustive with regard to the shape and arrangement of the cooling channels 10 in the Ring bandage 5 are viewed. In particular, combinations of the exemplary embodiments mentioned are possible

FIG. 11 shows an embodiment in which the ring bandage 5 consists of a first bandage base body 34 and a second bandage base body 34 '. Both bandage base bodies 34 and 34' essentially have a circular cross-section. cut open and are pushed onto each other with a tight fit. A spiral groove 48 is incorporated into the outer surface of the inner sleeve-shaped base body 34, which is accessible to the outside via connection openings 49 and 50. The supply of the cooling medium can then take place in a similar manner to previous exemplary embodiments 'The spiral groove 48 is closed by its inner surface 51, so that a cooling channel 10 is formed. The wall of the cooling channel 10 is accordingly formed by two individual bodies, the inner ring bandage 34 and the outer ring bandage 34' by the arrangement of the cooling channel 10 in the boundary surface thereof two Ringbandagengrundkorper 34 and 34 'this can be produced very easily

In a subsequent HIP process, the powder-mechanical wear layer 52 is welded to the outer bandage base body 34. At the same time, due to a specific choice of material for the inner bandage base body 34 and the outer bandage base body 34 ', the outer surface 47 is also welded to the inner surface 51, so that essentially one uniform, compact ring bandage 5 is preferably the two base bodies 34 and 34 'made of the same material, for example steel. A separation of these two components is only possible by destruction. The ring bandage 5 is then shrunk onto a roller base body in a known manner and is light It should also be mentioned that the cooling channels 10 are flooded with argon during the hot compaction in order to avoid a chemical reaction

The arrangement and cross-sectional design of the cooling channel 10 is dependent on the surface shape of the outer surface 47 and inner surface 51 and can be as desired. As an example, it should be mentioned that the spiral groove could also be incorporated into the outer roller base body 34 '

In FIG. 12, for reasons of corrosion protection, a corrosion-resistant tube 36 has been inserted into the spiral groove 48. The tube 36 is then anchored during the HIP process by means of a powder-detailed material 53, which was also emulsified into the spiral groove 48 and surrounds the tube 36 and fulfills the function similar to an adhesive. The powder metallurgical material 53 welds during the HIP process to the tube 36 and the basic drum cores 34 and 34 '. Here too, the design can be different and different material co minations can be used. The introduction of the spiral grooves 48 or other suitable recesses for generating the cooling channel 10 can be carried out very inexpensively in such an embodiment.

Claims

EXPECTATIONS

1 method for producing press rolls or bandages (5) or ring segments for press rolls (1) which have at least one cooling channel (10) for removing heat, characterized in that one or more of the at least one cooling channel (10) immediately surrounding (r ) Material (s) is or are welded together at least in regions by a hot compaction process

2 The method according to claim 1, characterized in that the structure surrounding the at least one cooling channel (10) is composed of at least two individual bodies to form a ring band or ring segment blank, and that the individual bodies are welded together by the hot compacting process

3 The method according to claim 1 or 2, characterized in that a high-strength powder-mechanical wear layer is formed on the outer circumference of the ring bandage or the ring segment blank by providing a powder-metal material during the hot compacting process

4 The method according to any one of claims 1 to 3, characterized in that at least one shaped body (36, 42, 44) is embedded in a powder-metallurgical material, the powder-metallurgical material is formed together with the at least one shaped body to form a ring band blank or ring segment tube, so that an outer surface of the at least one molded body forms the inner contour of the at least one cow channel (10) at least in some areas, and the powder-metallurgical material is subjected to the hot compaction process to produce a solid workpiece

5. The method according to claim 4, characterized in that the at least one molded body (36, 42, 44) during the hot compaction process is still embedded in the powder-metal material.

6. The method according to any one of claims 1 to 5, characterized in that the powder metallurgical material together with the at least one shaped body (36, 42, 44) and / or with the at least two individual bodies for forming the ring band blank or ring segment blank arranged in a capsule and be subjected to a hot isostatic pressing process in this molded capsule.

7. The method according to any one of claims 1 to 6, characterized in that a metallic base body (34) is provided, to which the powder metallurgical material is applied and by means of the hot compacting process, a connection between the powder-metal material and the metallic base body (34) takes place.

8. The method according to claim 7, characterized in that the powder-metallurgical material is applied in powder form to the metallic base body (34).

9. The method according to claim 7, characterized in that the powder metallurgical material is applied as a pre-pressed solid to the metallic base body (34).

10. The method according to any one of claims 7 to 9, characterized in that the at least one shaped body (36, 42, 44) is arranged on the base body (34) before the powder metallurgical material is applied.

11. The method according to any one of claims 1 to 10, characterized in that the at least one molded body (36, 42, 44) is removed after the hot compaction process.

12. The method according to claim 11, characterized in that the at least one shaped body (36, 42, 44) has at least one ceramic surface or is made entirely of ceramic.

13. The method according to claim 11, characterized in that the at least one shaped body (36, 42, 44) has at least one glass surface or is made entirely of glass.

14. The method according to any one of claims 11 to 13, characterized in that the at least one molded body (36, 42, 44) is removed by a chemical process.

15. The method according to claim 14, characterized in that a shaped body (36, 42, 44) made of glass is removed by a leaching process.

16. The method according to any one of claims 4 to 15, characterized in that the at least one shaped body (36, 42, 44) is a hollow body which is flooded with a pressure medium during the hot compacting process.

17. The method according to claim 16, characterized in that the pressure medium is an inert gas, preferably argon.

18 Method according to one of the preceding claims, characterized in that at least one first basic body (34) is produced, onto which at least a second basic body (34 ') is pushed, the adjoining surfaces (47, 51) of the basic body at least in regions (34, 34 ') are designed to form the at least one cooling channel (10) and the base bodies (34, 34') are welded together in their interior by the hot compacting process for molding the cooling channel (10)

19 press roller with a ring bandage or ring segments, which is or are produced by a method according to any one of claims 1 to 18, characterized in that the at least one cooling channel (10) is at least partially completely molded in the interior of the ring bandage or the ring segments and that the at least one cooling channel (10) structure directly surrounding at least two through the

Heat compacting process welded together single bodies (34, 34 ') is built

20 press roll according to claim 19, characterized in that a high-strength layer (35) made of a powder-metal material is provided and that in this layer (35) the at least one cooling channel (10) is arranged

21 Press roll according to claim 20, characterized in that the highly wear-resistant layer (35) made of the powder-metal material is applied to an annular base body (34) and connected to it

22 press roll according to claim 21, characterized in that the at least one cooling channel (10) is arranged near the interface between the base body (34) and high-strength layer (35)

23. Press roll according to one of claims 19 to 22, characterized in that at least one outlet or inlet of the at least one cooling channel (10) is arranged on one or the end face (s) of the high-strength layer (35).

24. Press roller according to claim 23, characterized in that on at least one end face (11, 16) of the ring bandage (5) a deflection or distributor ring (13, 18) is arranged, the at least one channel (12, 17, 30) has or seals, which is connected to the at least one cooling channel (10) in the high-strength layer (35).

25. Press roll according to claim 24, characterized in that several axially extending passages are provided as cooling channels (10), the inlets and outlets in the end face (11, 16; 37, 38) by the channel shape in the deflection or distributor ring ( 13, 18) are coupled to one another in such a way that a meandering channel guide is achieved.

26. Press roll according to one of claims 19 to 25, characterized in that in the at least one cooling channel (10) is arranged with the inner wall in contact with the coolant tube (36).

27. Press roll according to one of claims 19 to 25, characterized in that in the at least one cooling channel (10) at least one open-pore filling element (42) is arranged.

28. Press roll according to claim 27, characterized in that the open-pore filling element (42) is made of a powder-metal material.

29. Press roll according to one of claims 24 to 28, characterized in that the at least one cooling channel (10) is essentially completely filled with a solid body (44) made of a material with high thermal conductivity, in particular copper, which at least on the end face ( 37, 38) is connected to the at least one channel (30) in the region of the deflection or distributor ring (13, 18).

30. Press roll according to claim 29, characterized in that the solid body (44) in the region of the at least one channel (30) in the deflection or distributor ring (13, 18) or bandage shoulder has an enlarged cooling surface.

31. Press roll according to one of the preceding claims, characterized in that at least two ring-shaped or ring-segment-shaped base bodies (34, 34 ') are arranged one above the other and the at least one cooling channel (10) is formed between the base bodies (34, 34') and the Base body (34, 34 ') are welded together by the hot compacting process.