EP1457278B1 - Process for making a hollow cylinder of copper or copper alloy as well as a hollow casting roll made thereof - Google Patents

Abstract

Process for production of a hollow cylinder (6) in Cu or Cu alloy by winding a band (2, 2a) in Cu or Cu alloy onto a carrier (1) in several layers where in winding the individual layers are joined at least at some points and after winding the carrier is removed. An independent claim is included for a casting roll formed from a Cu or Cu alloy.

Description

On the one hand, the invention relates to a method for producing a hollow cylinder Copper or a copper alloy. On the other hand, the invention is directed to a Casting roller made of a hollow cylinder.

In the production of thick-walled raw material for mold plates, mold tubes or casting rolls become certain structural and material properties of the copper material required. Due to the dimensions of the various products However, it is often a problem to comply with the required material properties.

In particular, for the production of hollow cylindrical casting rolls are currently in the Usually round blocks of the desired material with the appropriate dimensions made, then forged and punched and ultimately on a thorn too Hollow cylinders forged or ring-rolled. Depending on the required dimensions Alternatively, cast blocks can be pressed into thick-walled pipes and / or pulled. The maximum ingot dimensions and ingot weights naturally also limit the dimensions of the respective end product. In the case of thick-walled, large-size materials, it may therefore depend on from the alloys and the dimensional relations outside to inside diameter of hollow cylinders and their lengths in terms of material requirements Quality problems come.

The invention is - based on the prior art - the object of a Method for producing a hollow cylinder made of copper or a copper alloy to create, in particular, the production of large-format products in one greater variation with economic effort allows. Furthermore, a can be provided economically to be produced casting roll in large format.

The procedural part of this problem is listed with the in claim 1 Characteristics solved.

Thereafter, a band of copper or a copper alloy in several Layers wound on a carrier body, wherein during winding the individual layers be added at least in certain areas. After winding, the support body away. There is then a hollow cylinder.

The layer-wise winding of the tape becomes a hollow cylinder with homogeneous structural properties produced. It is possible, hollow cylinder with different Material properties to manufacture, through different strip materials. For example, reinforcing materials such as steel, glass or carbon fibers be integrated into such a band. That way you can completely new copper composites with higher or with to the respective requirements specifically adapted strength properties are provided.

In the context of the invention, there is a further advantage in that now not more bulky ingots as starting material in certain final dimensions Bearings must be kept. All you need is materials with the corresponding materials Copper alloys in the form of tapes are kept (coils). This results in a high availability of the starting material, with the result that a weight limitation by casting and / or forging is eliminated. Furthermore is due to the strongly formed rolled strip a fine homogeneous microstructure achievable, regardless of the later final thickness of the product.

From the hollow cylinders produced in this way can then according to requirements Kokillerohre, Casting rolls and mold plates produced in an economical manner become.

According to the features of claim 2, the tape at an angle of 90 ° be fed to the longitudinal axis of the carrier body. It can also be two or several bands are wound parallel next to each other. Neighboring bands are then pasted over their band edges. The width and the number of bands determine while the length of the hollow cylinder to be produced.

Another winding method provide the features of claim 3. After that the band is deviating in a 90 ° to the longitudinal axis of the carrier body Supplied angle. This is done oscillating over the entire length of the produced Hollow cylinder, in layers from the one end of the carrier body to the other.

In order to add the individual layers of the winding properly, be in accordance with the features of claim 4 when winding the layers whose surfaces freed of adherent oxide layers. This can be done immediately before joining. For this purpose, suitable methods are brushing and / or pickling.

Also, the heating at least the outer layer of the winding (claim 5) serves to better connect the individual layers with each other. The heating up can be performed, for example, inductively.

Another way of winding and connecting see the features of the claim 6 before. Thereafter, the winding and joining of the layers under a protective gas atmosphere or performed under vacuum.

The joining of the layers can be done in different ways. According to claim 7, the layers are joined by pressing. This is done under high pressure. In particular, the so-called hot isostatic pressing ("Hippen") applied become.

A welding according to claim 8 is conceivable.

According to the features of claim 9, it is useful if the Layers are joined by brazing. Requirements for a perfect brazing are oxide-free surfaces, a protective gas atmosphere, but no Inert gas may be wrapped with, or the use of vacuum.

In this context, it is considered particularly advantageous if according to the features of claim 10, the tape to form a V-shaped Winding gap obliquely from above the horizontally oriented carrier body is fed, wherein in the winding nip high phosphorus-containing liquid solder with deoxidizing effect in a protective gas atmosphere or under vacuum ready and at least the outer winding layer of the winding body to soldering temperature is held. In this method is constantly in the winding nip Lotpool, whereby all resulting gaps between the layers with Lot filled. If at least the outer winding layer is heated, can constantly solder to a sufficient extent during the winding as a melt be provided in the winding nip. Preferably, the soldering takes place under Vacuum.

The temperature in the soldering gap should be approximately equal to the temperature of the solder plus 50 ° C.

The features of claim 11 are then preferably used, if at least two bands at an angle of 90 ° to the longitudinal axis of the carrier body be supplied. Depending on the width of the bands can then the finished wound hollow cylinders are coaxially joined together. Suitable for this purpose in particular, electron beam welding or friction stir welding, because of the wound hollow cylinder usually precipitation hardened materials for Get used. Their properties are then not or only slightly negatively influenced.

From a finished wound hollow cylinder can easily at least one Vorrohr be made for a mold tube. Also could by the winding process Vorrohr be created with graduated material properties, if different Materials are used. These can then both longitudinally the hollow cylinder can be used as well as in the radial direction.

However, it is particularly advantageous according to claim 12, when the formation of a Casting roll of finished wound hollow cylinder with an increased wear resistance having coating or provided with a wear sleeve.

If the band deviates in a 90 ° to the longitudinal axis of the carrier body Angle is supplied, arise at the end faces of the hollow cylinder numerous Butt joints, both in terms of pure stress as casting surface as well with regard to the wear stress on the lateral seals of casting rolls (edge dams) are to be regarded as critical. To avoid defects here, see the features of claim 13 that ready to form a casting roll wound hollow cylinders along the marginal edges with annular marginal ridges is provided. These sidebars then close after appropriate editing the end faces of the hollow cylinder to the winding layers. Critical abutments with numerous expiring tape ends are eliminated and on the front pages an uncritical Stress reached.

The skirting boards can be fastened in different variants. Is advantageous e.g. soldering, welding or hot isostatic pressing. Also a shrinking is conceivable. The material of the skirting can match the same as the band be. However, it is also possible to choose a different material type. It is advantageous, e.g. a choice of material with particularly favorable wear properties. The thermal conductivity should be as similar as possible to the material of the tape.

The features of claim 14 allow a finished wound hollow cylinder thereby reshaping into a plate that the hollow cylinder in a its longitudinal axis cutting plane and then bent flat. In connection This plate can be further transformed into a mold plate.

Depending on the application of a hollow cylinder, it may be advantageous, and in particular in the final design as a casting roll, if the entire circumferential casting surface the casting roll is coated. In this case, the coatability of the edge strips as a criterion. The coating of the surfaces can be galvanic respectively. The application of a thermal spray coating is conceivable. Furthermore, complete wear sleeves can be applied.

Casting rolls manufactured by the process according to the invention are in the patent claims 15 and 16 marked.

Figur 1

im Schema im vertikalen Querschnitt das Wickeln eines Hohlzylinders;

Figur 2

einen Horizontalschnitt durch die Darstellung der Figur 1 entlang der Linie II-II in Richtung der Pfeile IIa gesehen;

Figur 3

einen Horizontalschnitt durch die Darstellung der Figur 1 entlang der Linie II-II in Richtung der Pfeile IIa gesehen, gemäß einer weiteren Ausführungsform;

Figur 4

in schematischer Perspektive eine Gießrolle;

Figur 5

in vergrößerter Darstellung einen Längsschnitt durch die Darstellung der Figur 4 entlang der Linie V-V in Richtung der Pfeile Va gesehen;

Figur 6

in der Perspektive einen längsgeschlitzten Hohlzylinder;

Figur 7

in der Perspektive den Hohlzylinder der Figur 6 als gestreckte Platte;

Figur 8

in der Ansicht zwei einander zugeordnete Gießrollen einer Gießmaschine und

Figur 9

in vergrößerter Darstellung im Schnitt den Ausschnitt IX der Figur 8.

The invention is explained in more detail with reference to exemplary embodiments illustrated in the drawings. Show it:

FIG. 1

in the diagram in vertical cross section, the winding of a hollow cylinder;

FIG. 2

a horizontal section through the representation of Figure 1 along the line II-II seen in the direction of the arrows IIa;

FIG. 3

a horizontal section through the representation of Figure 1 along the line II-II seen in the direction of arrows IIa, according to another embodiment;

FIG. 4

in schematic perspective, a casting roll;

FIG. 5

in an enlarged view a longitudinal section through the representation of Figure 4 taken along the line VV in the direction of the arrows Va;

FIG. 6

in perspective a longitudinally slotted hollow cylinder;

FIG. 7

in perspective, the hollow cylinder of Figure 6 as a stretched plate;

FIG. 8

in the view of two associated casting rolls of a casting machine and

FIG. 9

in an enlarged view in section the detail IX of Figure 8.

In FIG. 1, 1 denotes a drive which is rotatable by means of a drive (not shown) cylindrical support body made of steel. On this support body 1 is a band 2 of a copper alloy in several layers 3 wound. The winding direction is designated WR. Although in the figure 1 between the individual layers 3 a distance is drawn, the layers are 3 when winding directly flat each other.

The tape 2 is obliquely from above to form a V-shaped winding nip 4 fed to the horizontally oriented carrier body 1. Located in the winding nip 4 a highly phosphorus-containing liquid Lot 5 with deoxidizing effect under vacuum. The vacuum is not illustrated in detail. At least the outer one Winding layer 3 of the winding body 6 is, in particular inductively, not illustrated in detail Keep the soldering temperature.

Is the intended wall thickness WD of the winding layers 3 on the carrier body 1 formed bobbin 6, the supply of the belt 2 is interrupted and the carrier body 1 removed. There is then a hollow cylinder 6 before.

The band 2 can according to Figure 2 at an angle α of 90 ° to the longitudinal axis 7 of the carrier body 1 are supplied. In this case, the length L corresponds to that of the wound Hollow cylinder 6 of the width B of the band 2.

It is also conceivable that a narrow band 2a according to Figure 3 in a 90 ° to the longitudinal axis 7 of the support body 1 deviating angle β is supplied. In In this case, the band 2a according to the arrow PF on the carrier body 1 of the left end 8 from to the right end 9 and then according to the arrow PF1 from the right front side 9 to the left end 8 oscillating out and wrapped here.

The layers 3 are not shown in detail in both FIG. 2 and FIG.

Figures 4 and 5 show an embodiment in which two according to the representations of Figures 1 and 2 wound hollow cylinder 6 coaxially to each other are joined. The joining of the two end faces 10, 11 of the hollow cylinder 6 is, for example done using the electron beam welding. The joint is denoted by 12.

Figure 5 also shows that to form a casting roll 13, the two together joined hollow cylinder 6 with an increased wear resistance having coating 14 are provided. This coating 14 can also be used in Form a wear sleeve to be applied to the two hollow cylinder 6.

Figures 6 and 7 illustrate an embodiment in which a ready wound hollow cylinder 6 in a longitudinal axis 15 intersecting plane E-E separated and this slotted hollow cylinder 6 then according to the arrows VII has been stretched in a plate 16. This plate 16 can then be a mold plate be further transformed.

FIG. 8 shows a casting machine 17 with two casting rolls 13 in the diagram illustrated. With DR, the directions of rotation of the casting rolls 13 are designated. to Forming a casting roll 13 is a wound according to Figures 1 and 3, the hollow cylinder 6 along the marginal edges 18 provided with annular edge strips 19 (FIGS 8 and 9). For this purpose, according to FIG. 9, a marginal edge region 20 of a wound one Hollow cylinder 6 turned out rectangular and in this twisted marginal edge area 20 an annular skirt 19 inserted. Through this sidebar 19, the critical abutment with the numerous expiring band ends is eliminated and achieved an uncritical stress on the front pages.

The determination of the edge strips 19 can by soldering, welding or through Hot isostatic pressing done. A shrinking is conceivable.

With 21 in Figures 8 and 9, the lateral seals (edge dams) of Casting 13 of a casting machine 17.

The casting rolls 13 can in particular by hot isostatic pressing on steel cores 22 be joined. This is schematically illustrated in FIG. 4 in broken lines illustrated.

REFERENCE NUMBERS

1 -

support body

2 -

tape

2a -

tape

3 -

documents

4 -

winding gap

5 -

Lot in 4

6 -

Winding body (hollow cylinder)

7 -

Longitudinal axis v. 1

8th -

Front side v. 1

9 -

Front side v. 1

10 -

Front side v. 6

11 -

Front side v. 6

12 -

joint

13 -

Casting roller

14 -

coating

15 -

Longitudinal axis v. 6

16 -

plate

17 -

casting machine

18 -

Marginal edges v. 6

19 -

sidebar

20 -

Marginal edge region

21 -

Seals f. 13

22 -

steel core

B -

Width v. 2

DR -

Direction of rotation v. 13

E-E -

Level by 15

L -

Length v. 6

PF -

arrow

PF1 -

arrow

WR -

winding direction

α -

angle

β -

angle

Claims (16)

1. Method for producing a hollow cylinder (6) made of copper or a copper alloy, in which a band (2, 2a) made of copper or a copper alloy is wound onto a carrier body (1) in a plurality of layers (3), wherein the individual layers (3) are joined, at least in regions, during winding, and the carrier body (1) is removed after winding.
2. Method according to claim 1, wherein the band (2) is fed at an angle (α) of 90° to the longitudinal axis (7) of the carrier body (1).
3. Method according to claim 1, wherein the band (2a) is fed at an angle (β) differing from 90° to the longitudinal axis (7) of the carrier body (1).
4. Method according to any one of claims 1 to 3, wherein, during winding of the layers (3), the surfaces thereof are freed of adhering oxide layers.
5. Method according to any one of claims 1 to 4, wherein, during winding of the layers (3), at least the respective outer layer (3) is heated.
6. Method according to any one of claims 1 to 5, wherein the winding and joining of the layers (3) is carried out under protective gas or under vacuum.
7. Method according to any one of claims 1 to 6, wherein the layers (3) are joined by pressing.
8. Method according to any one of claims 1 to 6, wherein the layers (3) are joined by welding.
9. Method according to any one of claims 1 to 6, wherein the layers (3) are joined by hard soldering.
10. Method according to claim 9, wherein the band (2, 2a) is fed obliquely from above to the horizontally oriented carrier body (1) with the formation of a V-shaped winding gap (4), wherein in the winding gap (4), a highly phosphorous- containing liquid solder (5) with a deoxidising effect is provided in a protective gas atmosphere or under vacuum, and at least the outer winding layer (3) of the winding body (6) (hollow cylinder) is kept at soldering temperature.
11. Method according to any one of claims 1 to 10, wherein at least two fully wound hollow cylinders (6) are joined coaxially to one another.
12. Method according to any one of claims 1 to 11, wherein, to form a casting roller (13), at least one fully wound hollow cylinder (6) is provided with a coating (14) having an increased wear resistance or with a wear sleeve (14).
13. Method according to any one of claims 1 to 11, wherein, to form a casting roller (13), at least one fully wound hollow cylinder (6) is provided with annular edge strips (19) along the edge margins (18).
14. Method according to any one of claims 1 to 11, wherein at least one fully wound hollow cylinder (6) is separated in a plane (E-E) intersecting its longitudinal axis (15) and this slotted hollow cylinder (6) is shaped into a plate (16).
15. Casting roller (13), which is formed from at least one band (2, 2a) made of a copper or copper alloy, which is wound to form a hollow cylinder (6).
16. Casting roller (13) according to claim 15, which is formed from at least two wound hollow cylinders (6) coaxially joined together.

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