以NC50型钻铤公螺纹作为研究对象，用有限元方法对加工有不同应力减轻槽的钻铤公螺纹接头进行了分析计算。
Take pin threads of NC50 drill collar as an example, Finite Element Method is used to analyze the different stress-relief grooves of pin thread connection.
本发明公开了一种密封内接头，所述一种密封内接头包括一个有槽管件内接头和二个密封圈。
The present invention discloses a sealing union, which comprises a union of pipe fittings with groove and two sealing rings.
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