This article proves that rolling operation can largely enhance fatigue strength through the research on the cold rolling operation of thread root of the drilling tool joint.
通过石油井下钻具接头螺纹冷滚压工艺的研究可以证明冷滚压可大大地提高接头的疲劳强度。
2
Through the analysis of dimensional chain when rollingthread on double-roller machine tool, the effective factors of thread precision were presented, and the way to solve was given.
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。
3
The threadrolling tap is made by tool steel or alloy, the precision is H4.