Apparatus and process for the fluid lubrication drawing of composite metal wires

摘要

A rod in the form of a composite metal wire having a harder metal core surrounded by a softer metal cladding is introduced together with lubricant into a die comprising an approach which includes a first frustoconical opening defining a vertical angle between 0 DEG and 5 DEG (exclusive of 0 DEG ) and a second frustoconical opening defining a vertical angle between 6 DEG and 20 DEG . The lubricant is pressurized in the first frustoconical opening of the die approach while the rod is drawn under fluid lubrication.