| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To stabilize fixation of a full head tip part to a drill shaft. <P>SOLUTION: A drill has the tip part (11) made of cemented carbide and a steel shaft. In the drill, the tip part (11) is fixed to the shaft at a lower side surface (21) by adhesion, and recesses and/or protrusions (30) are provided at the lower side surface (21). The height of them is made to be 15% of the height (28) of the tip part (11) at the maximum. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
