Cutting bit body and method for making the same
A cutting bit body that is a part of a cutting bit that includes a hard insert that is affixed to the cutting bit body and wherein the cutting bit impinges earth strata. The cutting bit body is an elongate powder metallurgical body member. A method for making a powder metallurgical cutting bit body that includes the steps of: providing a powder mixture; pressing the powder mixture into a green cutting bit body compact having a partial density; and consolidating the green body to form the powder metallurgical cutting bit body.
1. A method for making a cutting bit body comprising the steps of:
providing a fully sintered powder metallurgical cutting bit body component formed by consolidating a green powder metallurgical compact into the fully sintered powder metallurgical cutting bit body component, and wherein the powder metallurgical cutting bit body component comprises an iron-based alloy having at least about 30 weight percent iron;
providing a conventionally-made cutting bit body component, and wherein the conventionally-made cutting bit body component comprises an iron-based alloy having at least about 30 weight percent iron;
placing the fully sintered powder metallurgical cutting bit body component into direct physical contact with the conventionally-made cutting bit body component; and
joining together the fully sintered powder metallurgical cutting bit body component and the conventionally-made cutting bit body component.
2. The method according to claim 1 wherein the step of providing the fully sintered powder metallurgical cutting bit body component further includes removing material from a fully sintered powder metallurgical body.
3. The method according to claim 1 wherein the step of providing the fully sintered powder metallurgical cutting bit body component deforming a fully sintered powder metallurgical body.
4. The method according to claim 1 wherein the conventionally-made cutting bit body component is made by forging.
5. The method according to claim 1 wherein the conventionally-made cutting bit body component is made by casting.
6. A method for making a powder metallurgical cutting bit body comprising the steps of:
providing a first powder mixture consisting essentially of steel of a first composition located at a first location;
providing a second powder mixture consisting essentially of steel of a second composition located at a second location;
pressing the first powder mixture and second powder mixture into a green cutting bit body compact having a partial density; and
consolidating the green body to form the powder metallurgical cutting bit body wherein the first powder mixture forms a first region of the cutting bit body and the second powder mixture forms a second region of the cutting bit body.
7. The method according to claim 6 wherein the first powder mixture is an iron-based alloy having at least about 30 weight percent iron.
8. The method according to claim 6 wherein the second powder mixture is an iron-based alloy having at least about 30 weight percent iron.