The result is the aluminum is difficult to push through the die at the beginning of the cycle and the extrusion speed must be reduced at the back of the billet to prevent defects.
其结果是，在挤压周期开始时铝锭难以被挤压通过模具，铝锭后部的挤压速度必须被降低，以防止挤压出废品。
2
For direct extrusion presses, temperature tapering of the billet can provide significant increase in press speed without reducing profile quality and in some cases improving profile quality.