| 摘要 |
A Conform machine has a rotatable wheel (1) with a continuous groove (7) in a wall. A fixed shoe structure (9) associated with the wheel (1) provides a passageway and an abutment (11) on the shoe structure (9) closes off one end of the passageway. An extrusion die (13) leads from the passageway at or adjacent the abutment (11). The entire wheel (1) is located within a hood (19, 21) which is sealed except for apertures (27, 33, 25) for the feedstock (15), the extruded product (17) and the flash which is removed from the groove (7). A gaseous non-oxidising atmosphere is provided in the hood (19, 21) at a pressure greater than the atmosphere outside of the hood. This prevents oxide and other contaminants entering into the extruded product (17). |
