1. The mechanical status of nutted rod in drawing pipe with short mandrel rod is analyzed, the analysis basis for the dimensions design of nutted rod offered.
   文章分析了短芯棒拉拔管材时拉杆的受力，并对拉杆的尺寸设计提供了分析的依据。
2. It is not only meet with precision of the outface of parts,but also can assure the precision of the inface of parts.And it is developped the traditional process mandrel spinning.
   该工艺不仅能满足工件外表面精度的要求,而且还能保证内表面的精度要求,是对传统芯模旋压工艺的完善。

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