Process for the production of laminated cores

A method of manufacturing an electromagnetic assembly including at least one sheet stack, consisting of ferromagnetic material, and an additional component, said method comprising the steps of:

• providing a plurality of raw magnetic steel sheets;
• stacking said sheets for providing a sheet stack, forming said assembly from said stack and said component;
• positioning said assembly in a cavity defined by wall portions of a shaping tool and then providing said finished assembly by means of a pressure-gelation method, said pressure-gelation method comprising the steps of providing a liquid, thermally hardenable mixture which comprises a duroplastic epoxy resin component and a hardener component;
• introducing said mixture under pressure into said cavity such that said mixture is introduced into cavities between said sheets so as to connect them with one another as well as surrounds said sheets, said sheet stack and said assembly as a whole on preselected sides;
• hardening or hardening out said mixture at least as long until removal of said assembly from said shaping tool can take place;
• and heating said shaping tool at least during hardening or hardening onto said mixture;
• whereby in one single working step, said sheets are connected together, said stack is connected with said component and said assembly is surrounded on said preselected sides with an anti-corrosion layer having a thickness which is selected by a spacing between said sheet stack, said component and said wall portions of said spacing tool.