Hydrostatic extrusion of compound material

Abstract

Abstract IN HYDROSTATIC EXTRUSION OF A WIRE OR ROD CONSTITUTED BY A CASING OF ONE MATERIAL AND A CORE OF ANOTHER, USUALLY A SOFTER MATERIAL, A BILLET IS EXTRUDED THROUGH A DIE FROM A PRESSURE CHAMBER PROVIDED WITH A CONICAL SURFACE, ADJACENT THE DIE OPENING, THE BILLET IS SO CONSTRUCTED THAT THE AXIAL FORCES CREATED BY THE DIFFERENCES IN MOLDING RESISTANCE OF THE DIFFERENT MATERIALS ARE TRANSFERRED BETWEEN THE CASING AND THE CORE. THIS IS DONE BY PRESSING THE REAR END OF THE CASING INTO A GROOVE IN THE CORE. THE JOINT BETWEEN THE CASING AND CORE IS SEALED AT THE REAR ENDS. THE FRONT END OF THE CORE IS SHAPED TO MATCH THE CONICAL SURFACE OF THE DIE, AND THE CASING MAY BE BROUGHT DOWN OVER THIS FRONT END, THE FRONT END OF THE CASING TAPERING IN THICKNESS. SUCCESSIVE CASING AND CORES MAY BE JOINED ONTO THE REMAINING PARTS OF CASINGS AND CORES OF A PREVIOUS BILLET WHICH HAS BEEN LARGELY EXTRUDED.

Inventors

• 👤 Jan Nilsson

Bibliographic Details