Spreizvorrichtung fuer Blechpakete von elektrischen Maschinen

摘要

A spreading device for use in quantity production of lamination stacks for electric machines has sector pieces, which fit into the bore hole of the lamination stack and are placed on a spreading mandrel. The mandrel can be moved axially by a hydraulic drive. The end faces of the sector pieces are beveled on their insides and rest against a first conical surface connected to the spreading mandrel and against a second conical surface opposite to and facing the former. To achieve uniform alignment of the lamination stack over its full length, the second conical surface is displaced by a hydraulic drive and the two conical surfaces are moved towards each other by the same amount.