Software I DEAS and MARC were used to calculate the thread face contact stress during the make up process and to analyze the effect of taper mutation of pipe ( pin thread ) and coupling ( box thread ) on the thread face contact stress quantitatively .

利用I－DEAS和MARC软件计算了拧接过程螺纹齿面的接触应力，定量分析了管体（ 公螺纹）和 管 接箍（ 母螺纹）的 锥度变化对齿面接触应力的影响。

Non-cylindrical pin bore designed as elliptic or taper pin bore instead of cylindrical pin bore can effectively reduce its stress convergence and increase its service life .

将 销孔设计为椭圆形、 锥形等异型代替圆柱形，能有效的降低其应力集中，提高活塞寿命。

Connection between post upper rail shall be mounted by taper pin or welding the specified method refer to the details followed .

立柱与扶手管、 杆间采用 销钉 固定或焊接固定的方式，具体的连接方式见后面的的详细要求。

The new structure of a taper pin connection with external thread is introduced .

介绍了一种外端带有螺纹的 圆锥 销联接的新型结构。

The quality of the beads welded with inverted taper and cylindrical screw pin is poor only partially jointed or disjointed .

采用倒 圆锥形和螺柱形 搅拌 头焊接的接头 焊合不良，质量较差。