Additively Manufactured Tool Crown With Interlocked Base Bond

The drill bit employs a composite structure combining a metal carbide enforced matrix (providing wear resistance) with a steel core (providing tensile strength and ductility). The carbide matrix material forms the outer bit body while the steel core runs through the center, creating a composite structure that leverages the advantages of both materials: the carbide provides erosion and wear resistance, while the steel provides toughness and resistance to tensile cracking.

The invention merges the steel core with the connection element by forming the connection as an integral part of the steel core structure. The steel core extends outward to form the connection body directly, eliminating the need for separate welding operations to attach the connection to the steel core. This integration simplifies the manufacturing process while maintaining the necessary connection capabilities to the drill string.

The connection between the crown and base utilizes a composite bonding approach where metallurgical bonding (through sintering or diffusion bonding) creates a strong interface. The steel core acts as a mechanical interlock feature that physically anchors the crown to the base, while the bonding process creates a metallurgical connection. This dual mechanism provides superior connection reliability compared to traditional welding alone, preventing disconnection under high-stress drilling conditions.

The composite structure with steel core embedded in the carbide matrix provides both the durability needed for high-erosion environments and the mechanical properties required for standardized connections. The steel core's ductility and toughness enable the use of conventional connection methods while the outer carbide matrix provides the erosion resistance necessary for durability in demanding drilling conditions.