Non-mandreldrawing is a method widely used in cold drawn pipe production.
棒 拔制是冷拔钢管生产中应用最广泛的一种生产方法。
2
The causes producing wall thickness difference in a same pierced shell are expounded and the influences of piercing, rolling and mandreldrawing on the difference are studied.
阐述了穿孔毛管产生同管壁厚差的原因，研究了穿孔和轧管工艺对钢管同管壁厚差的影响。
3
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.