PROCESS FOR MAKING TUBES BY HOT EXTRUSION Russian patent published in 2005 - IPC

FIELD: plastic metal working, possibly manufacture of seamless hot extruded tubes of expensive metals and alloys, such as titanium alloys.

SUBSTANCE: process comprises step of placing in container technological washer in the form of disc before loading heated solid cross-section blank into it. Said washer is made of material whose yield limit at predetermined heating temperature exceeds that of blank material at extrusion temperature. Central opening is made in blank by through piercing at pressing out metal to container and at forming scrap of technological plate material. Then tube is extruded in gap between needle and die at forming remainder of technological plate material. Before extrusion process technological washer with formed opening is placed between blank and pressure pad.

EFFECT: reduced cost for making extruded tubes of expensive materials due to improved factor of using metal and due to lowered labor consumption for making technological washers.

2 dwg