| 摘要 |
<p>The present invention relates to a method of at least inhibiting metal fatigue in a tool (2) secured in a tool holder (4), which tool comprises a front side (6) shaped for use in forming of metal wire into nails, screws etc., and which tool holder comprises a recess (8) adapted for receiving the tool. New aspects of the method involve that the tool (2) comprises two sides (10,12) forming a wedge-shaped, which is narrowing towards the front side (6) of the tool, where the angle (A ) of the wedge-shaped is between 0.5 and 45 degrees, and preferably between 1 and 15 degrees. It is thereby obtained that the tool may be compressed between the sides of the recess, such that compressive stresses are introduced in the tool. Due to the angle of the wedge-shape of the tool and the recess, the compressive stresses may reach a high level. When the tool is afterwards used in the nail/screw making process, the tensile stresses caused thereby must relieve or overcome the built-in compressive stresses before a state of tensile stress in the tool can be present.</p> |
