| 摘要 |
<p>A drill (105) for making a hole within a workpiece has a body (110) extending along a longitudinal axis (115), at least one flute (120) extending along the body (110), and a drill point (125) extending from the end (112) of the body (110). The drill point (125) has a periphery (127) and is comprised of a chisel edge (135), a primary cutting edge (145) extending inwardly from the periphery (127), a secondary cutting edge (150) extending outwardly from the chisel edge (135), and a tertiary cutting edge (155) connecting the primary cutting edge (145) with the secondary cutting edge (150), wherein the tertiary cutting edge (155) has a negative axial rake angle (Z). A method for producing such a drill point (125) is also disclosed.</p> |
