a heat exchanger 40 for recooling a liquid coolant preferably water a pump 41 serves to circulate the coolant in this way the melt can be cooled quickly to produce casting 10 on a much smaller scale than that of fig1 and 2 fig3 5 and fig6 show two additional exemplary embodiments in which centrifuge drums 42 43 and their cooling surfaces 9 themselves form the greatest part of gas tight chambers 44 45 so that there is no longer any need for an external gas tight chamber this has the effect of reducing the investment and operating costs further the length of time required to exchange the gas or to evacuate the complete system is drastically decreased in the exemplary embodiment according to fig3 5 centrifuge drum 42 is connected nonrotatably to a ring shaped collar 46 which cooperates in a gas tight manner by way of a radial bearing 47 with a stationary bearing ring 48 a ring seal 49 is shown crosshatched between the two sets of rolling elements which form the radial bearing stationary bearing ring 48 is attached to a chamber wall 50 which is provided with an opening 51 inside bearing ring 48 this opening allows a pouring device 52 which is designed as an inductively heated melting crucible 53 in this case as well to be introduced into the chamber pouring device 52 is attached by means of a rotating extension arm 54 to a sealing plate 55 which serves to seal opening 51 to bring about the tilting motion the two end positions of which are illustrated in fig3 a tilting drive 56 is mounted together with sealing plate 55 in.