| 摘要 |
PROBLEM TO BE SOLVED: To provide a drill tool including a drill plate capable of preventing generation of continuous chips and a bracket therefor. SOLUTION: This drill tool has the drill plate 1 for performing drilling for a workpiece and the bracket 7 therefor. The bracket 7 is formed into a pin- shape and holds the drill plate 1 on the front side. The drill plate 1 has plate thickness expanded to a cutting geometry region (a region having a shape for cutting). In the region, chips destruction contour parts 14, 17 and 40 are formed. |
