钢管空拉减径，伴随着管壁变化。
The change of steel tube wall thickness during sinking is studied.
介绍了三辊减径机宽展孔型的设计方法。
The design method of the groove is presented here in the article.
张力减径机的主传动系统是由集中差速传动系统和单独传动系统组成的混合传动系统。
The main drive system of stretch reducer is made with differential and single driving system.
张力减径机的主传动系统是由集中差速传动系统和单独传动系统组成的混合传动系统。
The main drive system of stretch reducer is made with differential and single driving system.
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