| 摘要 |
The angle (3) formed by the flanks (2) of the breaking slot (1) is kept as small as possible, ideally approaching zero and resulting in parallel positioned flanks in the extreme. The inner surface is rounded at the tip (4) of the slot (1), the radius (5) as big as possible, resulting in a straight breaking line and even surfaces. The slot insert (8) is also rounded at the front in order to improve the result. |
