Patent ID: 8528624

Claim:
A mould for composite casting of a one piece cast tool, which comprises at least a first portion which defines a working component of the tool and which is manufactured from steel, and a second portion which defines a body component of the tool and which is manufactured from grey iron, the mould comprising at least one first mould cavity section for the steel and a second mould cavity section for the grey iron, and the tool having at least one interconnection zone between the steel and the grey iron, wherein a dividing plane between the at least one first mould cavity section and the second mould section is substantially planar and, in a position of use of the mould, substantially horizontal and located at an intended position of the interconnection zone, and at least one duct leading from the at least one first mould cavity section to at least one accommodation space for any possible surplus of steel, a lowermost defining surface of the duct at a discharge of the duct to the at least one first mould cavity section being located in a vertical direction on a same level as the dividing plane , wherein the duct is disposed in the at least one first mould cavity section in a central region between an ingate to the at least one first mould cavity section and a portion of the at least one first mould cavity section located most distally from the ingate.