DE1758008B1 - Process for the production of multilayer metals - Google Patents

Description

The invention relates to a method for producing multilayer metals, z. B. in the form of webs, strips, ribbons and the like.

It is known to use multilayer metals according to the principle of centrifugal casting in such a way that after centrifugal casting a first layer on it one or more further layers in the centrifugal casting process on the inside of the centrifugal casting be cast, whereupon the centrifugally cast body obtained in this way is then rolled off.

In the production of multi-layer centrifugal cast rings, this is the case in such a way that the centrifugal cast ring created only once or several times separated or divided and then the divided ring or the parts to the Rolling process are subjected. With such a procedure, the risk is not excluded, that by the resulting bending or stretching of the cut open during rolling Ring or parts of it, the layers can come off, especially if in the case of the multi-layer centrifugally cast body, the connection is not as it is theoretically should be. Failure to adhere to the exact temperatures is one reason for this When rolling the cut ring or the cut ring parts stretching or bending can cause the layers to shift to one another to adjust. This process favors the loosening of the layers from one another and that too Approach of atmospheric oxygen. This latter can cause an oxidation of the concerned Cause surface. With such uncontrollable loosening processes more or less In some cases, one layer of the other is no longer used by the rolling process a lot to bring the layers to full adhesion to one another. Meanwhile are with Roll the cut rings or the ring parts already cooled down. The application no matter how high a rolling pressure, the poor connection can do so on sections of the route not to improve significantly between the layers.

The object of the invention is in the production of multilayer metals after the centrifugal casting process and the subsequent rolling process, a multilayered one To obtain centrifugal casting, in which certainly a full-fledged multilayer metal is achieved with a perfect connection of the layers to one another. In the preparation of of multilayer metals, in which at least a first layer after centrifugal casting another inner layer is cast on using the centrifugal method and the centrifugally cast body obtained in this way is subjected to a rolling process, the invention is characterized in that the Rolling of a centrifugally cast body by means of the ring belt rolling process in the warm or takes place in the cold state and then carried out a transverse separation of the ring will.

The characteristic of the ring band rolling process is known to exist in that you can only perform the ring band rolling process when the workpiece represents a closed ring. Since the annular centrifugal cast body consists of several Layers exists, and the multi-layer centrifugal cast ring is rolled as such before the transverse separation takes place, there are significant advantages in several respects. The cast layers of the centrifugally cast ring are produced directly by the ring belt rolling mill subjected to a compression. This results in a better one for the end product Connection of the layers. It must be taken into account that the casting temperature during centrifugation often cannot be precisely determined. This also does not guarantee that that the thrown layers of different metal are on the contact surfaces have sufficiently connected. The rolling process helps here in a corresponding manner only if the multi-layer centrifugal cast ring is not divided, but that Rolling, d. H. the compression takes place with the remaining closed ring shape.

If you start rolling the annular centrifugal cast body immediately after casting so that the multilayer ring that has not been separated is rolled, d. H. after the ring belt rolling process, is made by the immediate rolling of the ring-shaped Slingshot each forced stretching of the various metal layers to one another, d. H. a phase shift of the multilayer metals is prevented. A loosening of the layers each other is excluded. Possibly existing bad connections between The multilayer metals can be closed ring by means of the rolling process correct in the most favorable sense. . The one that remained immediately after pouring Ring-shaped rolled centrifugal cast ring is more fully-fledged compared to the end product, in which the rolling of a split ring or ring parts is carried out. The coincidences otherwise impairing the connection of the multilayer metals can occur to be avoided with certainty.

After rolling off the closed multi-layer metal ring, it can can be separated and the band or parts thereof obtained in this way can be any be subjected to further post-treatment.

Claims (1)

Claim: Method for producing multilayer metals, at after centrifugal casting a first layer at least one further inner layer in the Centrifugal process is cast and the resulting centrifugal cast body one The rolling process is subjected to the fact that the Rolling of the centrifugally cast body by means of the ring belt rolling process in the warm or takes place in the cold state and then a transverse separation of the ring is carried out.