Kocks Technik Gmbh & Co.

Heinrich Faste

Ali Bindernagel

In the manufacture of hollow metal ingots, particularly for producing seamless tubes, the liquid melt is poured rapidly into an upright or slightly inclined chill mould, the chill mould is closed and is tilted into a substantially horizontal position in which it is slowly rotated about its longitudinal axis. The hole is produced in the hollow ingots by pouring into the chill mould a quantity of melt which corresponds to the total volume of the chill mould plus the shrinkage volume and less the volume of the desired hole. The method is particularly advantageous when manufacturing hollow ingots of great length, although the method can also be used when manufacturing short hollow ingots. It is particularly advantageous to blow in an accurately dimensioned quantity of inert gas, corresponding to the hole in the hollow ingot, during and after the actual pouring operation.

Method of manufacturing hollow metal ingots

A thin walled chill mould is provided with several cooling chambers by which the intensity of cooling can be varied during casting. During pouring, cooling of the lowermost chamber is commenced first and with low intensity. As filling continues, cooling by the other cooling chambers is commenced successively and at increasing intensities. After filling is complete, cooling is continued at these different intensities until the mould has been closed and tilted to the horizontal. Thereafter cooling is continued at maximum intensity in all chambers while the mould is rotated about its longitudinal axis. The method and the chill mould are provided particularly for the manufacture of long, slender ingots, billets or the like, particularly for the manufacture of seamless tubes. Corresponding control of the cooling operation avoids fissures and facilitates ejection of the ingot from the chill mould. Moreover, the control of the cooling operation permits the formation of a uniform concentric cavity when manufacturing hollow ingots.

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Grossenkneten, Germany

Heinrich Faste