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too much friction ? in backward extrusion of cylinder steel

too much friction ? in backward extrusion of cylinder steel

(OP)
Hi All

do decrease part of a cylindrical steel, we use backward extrusion (not hollow ) , but I notice that in the region of diameter change and also further ahead ( I mean where we have only the lower extruded diameter , that to me seems that there should be less contact and friction ), the material is rubbed away, and I see a lot of extrusion lines visible, like the material was too much in contact with the dies, how is this possible and where should I search the cause ? is it the deformation velocity ? lubrication or deformation ratio ?

any article related is so welcomed

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