| 摘要 |
<p>It is described a method of making holes in a first plate (1) and in a second plate (2) situated at a distance (3) from the first plate. The method comprises the steps of punching a hole in the first plate by means of a punch nipple (5); punching a concentric part (CP) which includes the hole out of the first plate (1); punching a hole in the second plate by means of the punch nipple (5); and pushing the punched out concentric part (CP) onto the hole into the second plate (2). This results in increased strength and stress characteristics especially around the hole in the second plate (2), which in turn may result in material savings, especially if the method is applied to a hollow rim of a wheel winch is to be provided with spokes by means of spoke nipples attached to the rim.</p> |
