method and device for preventing the shrinkage of metal in casting moulds or similar casting

摘要

The disclosure refers to a method for casting metal in an ingot mould by using a case or hot top to prevent pipe-formation in the ingot. The case or hot top is placed on or in the upper part of the mould and in contact with this part. The mould is filled with metal and then the case or hot top is moved off from the top of the ingot when a thin layer has solidified at the top of the ingot but before the ingot has completely solidified, in order to effect an air gap which is limited outwardly by the case or hot top and/or by a separate jacket.