Methods of forming and repairing cutting element pockets in earth-boring tools with depth-of-cut control features, and tools and structures formed by such methods
View Patent ↗Methods of forming and repairing earth-boring tools include providing wear-resistant material over a temporary displacement member to form a cutting element pocket in a body and a depth-of-cut control feature using the wear-resistant material. In some embodiments, the wear-resistant material may comprise a particle-matrix composite material. For example, a hardfacing material may be built up over a temporary displacement member to form or repair a cutting element pocket and provide a depth-of-cut control feature. Earth-boring tools include a depth-of-cut control feature comprising a wear-resistant material. The depth-of-cut control feature is configured to limit a depth-of-cut of a cutting element secured within a cutting element pocket partially defined by at least one surface of the depth-of-cut control feature. Intermediate structures formed during fabrication of earth-boring tools include a depth-of-cut control feature extending over a temporary displacement member.
1. A method of forming an earth-boring tool, comprising:
partially forming a cutting element pocket in a surface of a body of an earth-boring tool;
inserting a temporary displacement member into the partially formed cutting element pocket;
providing a particle-matrix composite material over an area of the surface of the body of the earth-boring tool adjacent the partially formed cutting element pocket and over a portion of a surface of the temporary displacement member to complete formation of the cutting element pocket and form a depth-of-cut control feature using the particle-matrix composite material; and
removing the temporary displacement member from the completely formed cutting element pocket and securing a cutting element within the completely formed cutting element pocket.
2. The method of claim 1 , wherein providing the particle-matrix composite material over the area of the surface of the body of the earth-boring tool adjacent the partially formed cutting element pocket and over the portion of the surface of the temporary displacement member comprises depositing a hardfacing material over the area of the surface of the body of the earth-boring tool adjacent the partially formed cutting element pocket and over the portion of the surface of the temporary displacement member.
3. The method of claim 2 , wherein completing formation of the cutting element pocket and forming the depth-of-cut control feature using the particle-matrix composite material comprises building up the hardfacing material over the temporary displacement member to complete formation of the cutting element pocket and form the depth-of-cut control feature using the hardfacing material.
4. The method of claim 3 , wherein building up the hardfacing material over the temporary displacement member comprises building up the hardfacing material to a predetermined height above the surface of the body of the earth-boring tool adjacent the cutting element pocket.
5. The method of claim 4 , further comprising forming the depth-of-cut control feature to comprise a predetermined minimum surface area at the predetermined height above the surface of the body of the earth-boring tool adjacent the cutting element pocket.
6. The method of claim 3 , further comprising selecting the hardfacing material to comprise hard particles and a metal alloy matrix material.
7. The method of claim 6 , further comprising selecting the metal alloy matrix material to comprise at least one of an iron-based metal alloy, a cobalt-based metal alloy, and a nickel-based metal alloy.
8. The method of claim 1 , wherein inserting a temporary displacement member into the partially formed cutting element pocket further comprises selecting the temporary displacement member to comprise at least one of aluminum oxide and silicon oxide.
9. The method of claim 8 , wherein selecting the temporary displacement member to comprise at least one of aluminum oxide and silicon oxide comprises selecting the temporary displacement member to comprise about 95% by weight aluminum oxide and about 5% by weight silicon oxide.
10. The method of claim 1 , wherein the earth-boring tool comprises a rotary drill bit, and further comprising forming the body to comprise a bit body.
11. The method of claim 1 , further comprising providing another particle-matrix composite material having a different material composition over another area of the surface of the body of the earth-boring tool adjacent another partially formed cutting element pocket to complete formation of another cutting element pocket and form another depth-of-cut control feature using the another particle-matrix composite material.