| 摘要 |
<p>The tool (1a) has spreading elements (8) including an inclined upper front surface (10) pointing in an opposite axial direction (A'), and an inclined lower front surface (11) pointing in an axial direction (A). The surfaces include an outer geometrical form extending in a direction, which is not perpendicular to a geometric longitudinal axis (L). The adjacent spreading elements displace in opposite radial directions (R1, R2) by a radial clearance by reducing an axial distance between upper and lower supports (6, 7). Axial force (Ka) is converted into radial force (Kr) in the radial directions.</p> |
