| 摘要 |
PROBLEM TO BE SOLVED: To provide an extruding method of an aluminum extruded shapes which is comparably simple, by which the thickness variation of the aluminum extruded shapes is suppressed effectively as much as possible and also by which the suppression in thickness variation can be continued in the extrusion of multiple billets. SOLUTION: The ram speed at which the extrusion in a lot by which the extrusion of multiple billets is repeated is taken as the ram speed of the high speed of about 1-1.3 cm/s at first, next, the ram speed of the ordinary speed of about 0.8 cm/s and the ram speed of the low speed of about 0.7-0.5 cm/s by performing the sequence control of the ram speed of an extrusion machine. The thickness variation in the lot is suppressed by inducing the thickness of the aluminum extruded shape to the thin side at the first high speed and inducing the aluminum extruded shape to the thick side at the ordinary speed and the low speed after that. COPYRIGHT: (C)2006,JPO&NCIPI
|
