Given here is the working principle of the hydraulic screwdown control system for end-tapering when rolling with mandrel mill so as to eliminate pipe end-thickening/thining in the course of sizing.

• 介绍了在连轧管机中将管端轧成锥形,用以消除张减时的管端增厚及管端减薄的液压压下控制系统的工作原理。