VERFAHREN UND WERKZEUG ZUM ABRUNDEN UND VERDICHTEN VON KANTEN

2.1. Hitherto, the edges of extruded sections have been rounded off by machining. This is expensive since the tool has to be reset. With the new tool, the edges are to be rounded off and compacted in such a way that a tolerance zone of +/- 0.3%, relative to the length and width of the workpiece, can be processed. The thickness tolerance is to be no more than +4%. The fatigue strength of the cut section is to be increased. 2.2. Between the flanks (1, 2) and (3, 4) respectively of the upper die (5) and lower die (6) respectively and of the upper die face (7) and of the lower die face (8) respectively, an angle of inclination alpha = 96-105 DEG is provided and, in the corners (9, 10) and (11, 12) of the upper die face and of the lower die face, respectively, a radius of 1-5 mm is provided. The clear width between upper die face and lower die face in the closed condition is 10-50 mm. The thickness of the extruded section has an oversize of 1-3% and the section is placed between the two die halves, which are driven together abruptly, leaving no gap. 2.3. Rounding off and compaction of the edges of extruded sections composed of aluminium, in particular AlMgSi.