研究表明，用多个扇形模具块对焊管端口进行机械扩径时，椭圆管坯的塑性变形具有显著的局部特性，且主要集中于悬空段。
The study shows that plastic deformation of the elliptical tube which has a significant local characteristic mainly concentrates in the vacant section, when expanding using several expanding punches.
数据采集卡采用PC I局部总线接口，通过双端口ram进行数据传输。
Through PCI interface and dual port SRAM, host accessed data from the card.
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