法兰内孔管件内孔必须倒角焊接。
本文主要研究以冲压变形规律设计的预制孔管件一次成形特定高度的三通管是可行的，但需对工艺参数优化。
This paper proposes that: the deformation in stamping design prefabricated hole forming specific height fittings first tee is feasible, but needs to process parameter optimization.
将丝蛋白溶液涂在旋转卷筒上，可以对图案、管开孔率以及复合特性进行控制。
Winding the silk solution on a rotating mandrel provides control of tube properties like winding pattern, tube porosity and composite features.
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