The streamlined diameter-adjustable mandrel has been designed by analysis its structure and calculation, which supply a way for opening the similar produce.
设计了一种新型的可调直径卷筒，对卷筒的总体结构进行了分析和设计、计算，为开发同类产品提供了设计依据。
The size of the slit (16) is adjustable to meet the requirements of drawing the mandrel bars with different specifications.
开缝（16）的大小可调以适于拔不同规格芯棒的需要。
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