| 摘要 |
Annular core bit (1) comprises a least two geometrically defined, flat cutting elements (2a, 2b). The first cutting element (2a) has an axial cutting angle (alpha1) and a radial cutting angle (beta1), and a second cutting element (2b) has an axial cutting angle (alpha2) and a radial cutting angle (beta2). The axial cutting angles and/or the radial cutting angles are different. Preferred Features: At least one cutting element has a radial cutting angle that is not equal to 0, or an axial and radial cutting angle that are not equal to 0. |
