| 摘要 |
A rotary-percussion drill, includes a hard material bit ( 2, 2 ') having at least one cutting edge ( 3, 3 '), and a shaft having an end ( 7, 7 ') with an axial base surface ( 6, 6 ') provided with a chamfer ( 8, 8 ') at least on its outer radial rim, the bottom surface ( 4, 4 ') of the bit ( 3, 3 ') which lies opposite the cutting edge ( 3, 3 '), being secured to the base surface ( 6, 6 ') of the shaft end ( 7, 7 ') by brazing alloy in a material-locking manner.
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