| 摘要 |
PCT No. PCT/GB92/01478 Sec. 371 Date Apr. 28, 1993 Sec. 102(e) Date Apr. 28, 1993 PCT Filed Aug. 10, 1992 PCT Pub. No. WO93/02823 PCT Pub. Date Feb. 18, 1993Wear resistant rotary machining tools including twist drill bits, slot drill bits, thread taps, end mills and reamers are disclosed. The tools comprise a body of cemented tantalum, titanium tungsten carbide (1) having a layer of abrasive polycrystalline diamond or cubic boron nitride compact (2) bonded to a convex curved surface of the tool body. The twist drill bits of the invention comprise a layer of abrasive compact of substantially uniform axial thickness extending over substantially the whole top surface of the tip of the drill bit. Methods of manufacturing the wear resistant tools are also disclosed. |
