Drag bit cutting characteristics using sintered diamond inserts. Report of investigations/1983

Technical Report · Tue Nov 01 04:00:00 EST 1983

OSTI ID:5065098

Roepke, W W; Hanson, B D; Longfellow, C E

The Bureau of Mines tested new designs of drag bit cutters with sintered diamond inserts instead of standard tungsten carbide tips. The bits were tested for orthogonal cutting forces, primary dust generation, and incendivity, with a standard plumb-bob type conical cutter (60 degrees included tip angle) as the reference. Preliminary wear and impact-failure testing were also done. The results were mixed. Two new designs had forces similar to those of the reference bit, but one new design had about twice the normal force. This same design had almost twice the specific energy during shallow cutting but generated an equal or slightly lower amount of primary dust than did the references bit. Incendivity was eliminated for two radial designs. One conical design had ignition only after more than 15 impacts, but the other conical design was incendive. Impact failure occurred, but not so quickly as anticipated.

• Research Organization: Bureau of Mines, Twin Cities, MN (USA). Twin Cities Research Center
• OSTI ID: 5065098
• Report Number(s): PB-84-140185; BM-RI-8802
• Country of Publication: United States
• Language: English

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