Patent ID: 7204117

Claim:
A method of producing a bar-shaped hard metal tool comprising at least two materials of different hardness, wherein the first material has the lower hardness and forms a bar-shaped support for the second, harder material, wherein the first material is provided within a first extrusion tool in the form of a plastic first mass flow, the second material is provided within a second extrusion tool similarly in the form of a plastic second mass flow, the second material is fed to the first extrusion tool by way of a channel connecting the two extrusion tools and forced within the first extrusion tool into the first mass flow, a common plastic mass flow of the first and second material is issued from the first extrusion tool as a bar-shaped body in which the first material forms a bar-shaped support for the second material and the bar-shaped body issued from the first extrusion tool is further processed to form a hard metal tool, wherein output signals of a sensor are coupled to a control unit, and wherein the control unit generates control signals such that volumes of the first and second mass flows are controlled individually.