| 摘要 |
<p>The present invention provides a drilling tool and method for producing the same, whose shank body does not rust easily with excellent usability even if the drilling tool is coated with hard coating in the high-temperature process and having higher characteristic property. The drilling tool is formed of the blade part (1) and the shank part (4). The blade part (1) has a spiral chip discharging groove (2) at the outer periphery of the tool body. The shank part (4) has a shank body (3) whose diameter on the base end side is greater than that of blade part (1). The blade part (1) is made of super hard alloy. The shank body (3) is made of stainless steel. A shank taper part (6) which is more tapering as it approaches the front end is formed at the front end of the shank body (3). At least the portion near the shank body of shank taper part (6) is made of stainless steel. At least the outer periphery surface (12) of blade part (1) and the shank taper part (6) portion which is made of stainless steel are coated with the hard coating, while the outer periphery surface of shank body (3) is not coated with the hard coating.</p> |
