| 摘要 |
A continuous extrusion apparatus has a rotatable wheel (2) with a peripheral groove (5). A shoe (4) encompassing part of the wheel (2) covers an arc of the groove (5) and terminates at an abutment (17) which penetrates and closes the groove (5). The shoe (4) and wheel (2) define a passageway for receiving a metal feedstock rod (1A) and propelling it to an extrusion zone (30) adjacent the abutment (17), from which zone (30) the feedstock (1A) is extruded through a die (9). The wheel groove (the ''main groove'') (5) has an adherent metal lining (12) for gripping and propelling the feedstock (1A). The lining (12) incorporates at the bottom a subsidiary groove (13) of width smaller than the main groove (5), into which subsidiary groove (13) a narrow metal feedstock rod (1A) of width less than that of the main groove (5) is urged and so propelled to the extrusion zone (30). The abutment (17) maintains the shape of the main and subsidiary grooves (5, 13) as the wheel (2) rotates. A ramp (16) projects into the main groove (5) at a position upstream of the extrusion zone (30) and urges the narrow feedstock rod (1A) into greater frictional engagement with the subsidiary groove (13) as the rod (1A) is propelled into the extrusion zone (30). |
