本文通过对在双滚柱机上滚压螺纹时，形成尺寸链的分析，找出影响螺纹精度的因素，并提出了解决途径。
Through the analysis of dimensional chain when rolling thread on double-roller machine tool, the effective factors of thread precision were presented, and the way to solve was given.
提升螺杆上、下端采用调心滚柱止推轴承双调心吊挂结构改善提升螺杆受力状态。
The upper end and the lower end of a lifting screw are in a double-self-aligning hanging structure with a self-aligning roller step bearing so that the stress state of the lifting screw is improved.
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