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。
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.
很多车削中心都配有杆进给，通过数控技术可以提高螺杆压出机的速度。
Many of these turning centers are equipped with bar feeds which provide the speed of a screw machine with the CNC accuracy.
不同的压力和轴向进给速度可滚压出不同的粗糙度和硬度。
Variation of the pressure and the axial speed results in different roughness and hardening.
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