Shear Assisted Processing and Extrusion

摘要

hear Assisted Processing and Extrusion (ShAPE™) allows creation of wire, bar, and tubular extrusions that show significant improvement in material properties; for example, magnesium extrusions have been manufactured with unprecedented ductility (how far the material can stretch before it breaks) and energy absorption (how much energy can be absorbed during compression of a tubular extrusion) over conventional methods. The technology is part of PNNL's suite of Solid Phase Processing (SPP), an approach to metals manufacturing that can be better, cheaper, and greener than melt-based methods typically associated with metals manufacturing. In ShAPE, a canister holding feedstock material — such as metal powder, flake, or billet — is forced into a rotating die. Frictional heating is generated at the interface between the feedstock material and die, softening only the material being extruded and eliminating the need for feedstock pre-heating or application of external heat used in conventional extrusion. Spiral grooves on the die face feed the material inward toward the extrusion orifice, which greatly reduces the force required during extrusion.