A process for the preparation of a shell or the form for the manufacture of the inner body of a lamellar collector of an electric motor and / or as part of such a collector, or a similar metallic werkstuecks as well as produced according to this process shell or the form of

摘要

A copper tube is placed in a matrix having on its inside surface longitudinal grooves whose number equal that of the collector plates to be obtained. A non-cutting spindle is then forced into the tube, the spindle having the same number of external channels separated by smooth, intermediate sections. The spindle pushes out the metal locally into the matrix grooves by only shaping the metal in the parts subjected to this deformation. The intermediate sections remaining almost untouched are subsequently formed to produce fixings in the form of two hooks on each part constituting a thin section.