Claims
- 1. A method of manufacturing inserts for rock bits comprising the steps of:
- forming said inserts out of a composite material comprising grains of relatively hard, abrasion resistant material and a binder material for binding the grains together, said inserts having outer surfaces;
- sintering said composite material in a furnace cycle;
- grinding said inserts to obtain accurate diameters; and
- polishing said insert surfaces by means of vibratory finishing or tumbling for a time period of at least 90 minutes.
- 2. The invention of claim 1 wherein said insert surfaces are polished for a time period of at least 225 minutes.
- 3. The invention of claim 1 wherein said polishing step is accomplished by placing the inserts into a container filled with a liquid and vibrating said container.
- 4. The invention of claim 1 wherein said polishing step is accomplished by placing the inserts into a container filled with a liquid and rotating said container.
- 5. The invention of claim 3 wherein said polishing step further includes placing a plurality of balls of similar material as said inserts in said container.
- 6. The invention of claim 4 wherein said polishing step further includes placing a plurality of balls of similar material as said inserts in said container.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of co-pending application Serial Number 034,967, filed on Apr. 6, 1987, now abandoned.
US Referenced Citations (5)
Non-Patent Literature Citations (1)
Entry |
Cutter, et al.; Correlation of the Mechanical Properties of WC-Co. with Drilling Performance in Hard Formations, Jul. 1982, pp. 77-79. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
34967 |
Apr 1987 |
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