Ancona metal expansion and process for its production

摘要

The wall plug has at the front end an expanding cone (4) with a polygonal cross-section. It has on each polygon face an expanding shell (5) with a gap (7) towards the polygon face which corresponds roughly to the radial overhang (8) of the shell (5) relative to the diameter of the shaft. Each expanding shell is connected on its end side facing the rear end of the shaft part (2) by webs (6, 6') forming ideal break points. The polygonal faces pref. have a curvature with the same radius of curvature at each point. The shaft is made with the cone and shells from metal powder in the injection casing process using a binder system and subsequent binder removal and sintering. A slider is used to form the gaps (7).