Patent ID: 8602083

Claim:
A method of composite casting of a one-piece cast tool which comprises at least one first portion which comprises a working component of the tool and which is manufactured from steel, and a second portion which comprises a body component of the tool and which comprises grey iron, there being formed an interconnection zone between the steel and the grey iron, comprising carrying out the casting process in a single mold which is kept unchanged and closed throughout an entire casting process, casting the steel in a direction from beneath and upwards, after casting of the steel, pausing for a period of time, depending upon on a quantity of and shape of the at least one first portion of the tool, so that a first temperature in the steel at contact surface of the steel is substantially uniform and corresponds to the liquidus temperature minus approximately 30°-150° C., and casting the grey iron onto the contact surface of the steel to form the interconnection zone after the steel is at the liquidus temperature minus approximately 30°-150° C.