... 钻铤内孔 drill collar bore 钻铤弯曲率 drill collar curvature 钻铤应力减轻槽 drill collar groove ...
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After processing LET thread, stress groove and double shoulder connection for the NC35 thread of Drill Collar in 43/4 inch, torsion tests were done.
4英寸）钻铤NC35螺纹加工LE螺纹、应力槽、双台肩后进行了实物抗扭性能试验，证实双台肩钻铤具有很好的抗扭性能。
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