Normally, if there is no unscheduled downtime, the maximum yield mainly depends on the extrusion speed, while the latter is subject to the four factors, three of the fixed and the other is variable. The first factor is the extruder extrusion, extrusion pressure big in the ingot billet temperature low extrusion smoothly; The second factor is the die design, extrusion of metal friction between the die wall usually can be made by aluminum alloy temperature rise of 35 ~ 62 ℃; The characteristics of the third factor is squeezed alloy is uncontrollable factors to limit the extrusion speed, the profile of the outlet temperature shall generally not exceed 540 ℃, otherwise, the surface quality is reduced, mould mark increase obviously, appear even glued aluminum, gravure, microfracture, tear, etc. The last factor is the temperature and degree of controlled.