螺纹

In order to enhance their corrosion-proof capability and improve maintainability and service life, the author makes a suggestion of reasonable selection of the coating thickness and thread fit clearance while ensuring the thread attachment strength, based on the re.

为提高飞机螺纹连接件的抗腐蚀能力，改善飞机的维修性能和提高飞机的使用寿命，本文根据镀层厚度与螺纹配合间隙的关系，结合国内外相应标准的规定，在保证螺纹连接强度的情况下，对如何合理选择镀层厚度和螺纹配合间隙来提高抗腐蚀能力的问题做了论

Study is aimed at box threads of Φ177.8mm drill collar to analyze and calculate drill collar box thread with different stress-relief grooves using finite element method, the stress concentration of thread end of 3 types of box threads is gained under same boundary condition and load.

以177.8mm钻铤母螺纹接头作为研究对象，用有限元方法对加工有不同应力减轻槽的钻铤母螺纹接头进行了分析计算，得出了3种不同母螺纹结构在相同边界条件和载荷作用下螺纹消失端的应力集中情况。

The numerical analyses also showed that VCR element has the best distribute mixing effect and normal double-thread screw element take the second place, normal double-thread screw element is the weakest among them.

模拟结果表明：常规双头螺纹元件分散混合能力最强，常规三头螺纹元件次之，VCR元件最弱；而VCR元件分布混合能力最强，常规三头螺纹元件次之，常规双头螺纹元件最弱。

Number of loaded circuits DN Value Preload Method for Providing a Preload Applied preload 1row 2.50 turns 70000 Yes fixed point preload 4055 Type of guide Shaft process method Ball cage Splined portion Hollow shaft Ball Precision None None None Recommended support unit on the Fixed Side type Recommended support unit on the Supported Side type Types of Nuts Threading direction Spacer ball None None Double-nut Right-hand, left-handmust be check...

载荷钢球圈列数 DN值预压预压方法预压负荷 3列 2.50圈 70000 有定位置预压 4545 导轨型号丝杠轴加工方式球保持器轴的花键部分中空轴滚珠精密无无无轴承支撑座固定侧的推荐方式轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球无无双螺帽右螺纹，左螺纹，左右螺纹无轴方向刚性。。。

According to connection method classification (1) threaded connection valves: valve with internal thread or external thread, and pipe thread connection.

按连接方法分类(1)螺纹连接阀门：阀体带有内螺纹或外螺纹，与管道螺纹连接。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 16 81.1 231.3 14.61 20.85 Type using standard material Standard grease Standard seal Iron-based AFB-LF None Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with...

载荷钢球圈列数 DN值预压预压方法预压负荷 2列 2.50圈 70000 有定位置预压 4370 导轨型号丝杠轴加工方式球保持器轴的花键部分中空轴滚珠精密无无无轴承支撑座固定侧的推荐方式轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球无无双螺帽右螺纹，左螺纹，左右螺纹无轴方向刚性。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 6 29 99 3.42 11.31 Type using standard material Standard grease Standard seal Iron-based AFB-LF None Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with QZ atta...

载荷钢球圈列数 DN值预压预压方法预压负荷 1row 2.50圈 70000 有定位置预压 765 导轨型号丝杠轴加工方式球保持器轴的花键部分中空轴滚珠精密无无无轴承支撑座固定侧的推荐方式轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球 BK30，FK30 BF30， FF30 双螺帽右螺纹，左螺纹，左右螺纹无轴方向刚性。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 10 52.7 141.1 6.16 8.22 Type using standard material Standard grease Standard seal Iron-based AFB-LF None Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with QZ...

载荷钢球圈列数 DN值预压预压方法预压负荷 2列 2.50圈 70000 有定位置预压 3080 导轨型号丝杠轴加工方式球保持器轴的花键部分中空轴滚珠精密无无无轴承支撑座固定侧的推荐方式轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球 BK30，FK30 BF30， FF30 双螺帽右螺纹，左螺纹，左右螺纹无轴方向刚。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 10 26.1 56.2 2.2 4.98 Type using standard material Standard grease Standard seal Iron-based AFB-LF RR Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with QZ att...

载荷钢球圈列数 DN值预压预压方法导轨型号 1row 3.50圈 70000 无无滚珠丝杠轴加工方式球保持器轴的花键部分中空轴轴承支撑座固定侧的推荐方式精密无无无 BK20，EK20，FK20 轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球轴方向刚性 BF20， EF20， FF20 单一螺帽右螺纹，左螺纹，左右螺纹无 440.0 螺。。。

Lead Ph Basic load rating Permissible load F P Nut mass Shaft mass Dynamic rating Ca Static rating C 0 a mm kN kN kN kg kg/m 4 5.1 10.5 0.32 1.35 Type using standard material Standard grease Standard seal Iron-based AFB-LF RR Dimensions of the Ball Screw Nut Attached with Wiper Ring W and QZ Lubricator WW avail- ability QZ avail- ability Dimensions including WW L Length of protrusion with QZ attached QWL Outer diameer of protru- sion with QZ atta...

载荷钢球圈列数 DN值预压预压方法导轨型号 1row 2.50圈 70000 无无滚珠丝杠轴加工方式球保持器轴的花键部分中空轴轴承支撑座固定侧的推荐方式精密无无无 BK12，EK12，FK12 轴承支撑座支撑侧的推荐方式螺母种类螺纹方向间隔钢球轴方向刚性 BF12， EF12， FF12 单一螺帽右螺纹，左螺纹，左右螺纹无 190.0 螺。。。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失