Abstract: The combined forward extrusion experiment research that can simultaneous extrude all gibbose platform and pole in once excursion of hydraulic press is for the plane-hook-commutator body in motors－one kind of multi- pole part with gibbose platform & joined principal part. The experiments has actualized successfully integral cold extrusion of the hook-commutator, and implemented the numerical simulation by computer soft super forge for the cold extrusion process. The result manifest that the every part of combined extrusion deformation process has 3 stages parallel－compression, extruding gibbose platform and then pole at one time. Accord-ing to that a new concept of collateral extrusion or a new dis-tortion form in combined extrusion is put forward, and expect to provide some gists or references for more development of cold extrusion technics theory and application.

Key words: Cold combined extrusion, Hook-commutator, Numerical simulation, Parallel extrusion, Technical experiment