Expanding Field of Application of Cold Die Forging by Inducing Active Contact Friction Forces

摘要

A highly productive method for the cold die forging of blanks makes it possible to fabricate parts with smooth surfaces and the required mechanical characteristics without subsequent heat treatment and machining. The field of application for this method is restricted to high stresses in dies that deform a blank, which reduces their fatigue resistance. Extrusion with applying active friction forces, during which the mold moves in the direction of a blank material flow with a velocity that exceeds the flow velocity, makes it possible to unload dies and produce parts from medium-carbon and low-alloy steels by cold die forging. This work deals with assessing the increase in the fatigue resistance of dies during the extrusion of steel 45 blanks with applying active friction forces.