本发明的专用挤孔模具结构简 单、加工精度高。
The special extrusion die has the advantages of simple structure and high processing precision.
用预拉、挤孔、喷丸等强化工艺来提高摩托车链条的疲劳寿命效果很明显；
Using of pre-drawing, extruding holes and shot peening techniques has shown obvious effect in extending the fatigue life of motorcycle chain.
给出了坯料尺寸及热挤压力的计算方法，并对整形模、挤孔模、热挤压模的设计做了介绍。
The size of the die and the calculation method of hot extrusion force were presented, and the design of reshaping die, extruding hole die and hot extrusion die was introduced.
本文主要分析孔的挤胀销棒应力压印工艺特点，挤压孔的受力机理分析，并通过疲劳试验观察不同条件下的寿命。
This paper mainly analysis the holes technics of the Expansion Pin stress Coining and the principle of the stress holes, discuss the lifetime under different condition by fatigue test.
潜孔锤冲击挤密钻进技术集冲击钻进、振动钻进及空气钻进的优点于一体，钻进效率高，成孔质量好，在土质地层钻进工程中有着广阔的应用前景。
The DTH percussion-compact drilling is a high efficiency technology drilling in soil strata, which use the impact force produced by hammer piston to crush and compact soil.
建立了射孔段套管弹性抗挤性能分析控制一般方程，并采用摄动理论给出了的孔段套管弹性抗挤能力降低系数一般计算公式。
This paper gives the elastic differential equation of collapse of perforated casing, and a general formula for reduction factor of elastic collapsing by perturbation method.
通过对不同位置的桩间土的物理力学性能的试验比较，表明人工成孔挤密灰土桩对桩周土的挤密效果不明显。
The compaction effect of artificially drilled lime-soil pile is not obvious comparing test results of soils between piles at different position.
对挤密桩挤密成孔过程中桩周土体的应力变化和随应力变化发生的桩间土体挤密效果的理论研究并不是很多。
There is few theoretical analysis and study about the soil stress variation and the soil compacted effect between piles when making holes.
利用推导的抗挤强度系数理论公式分析孔径、孔密及相位角的变化对其抗挤强度系数的影响，其结果为优化射孔设计提供了简便的方法。
The shot diameter, shot density and shot phasing related to the collapsing strength coefficient are analyzed, and the result is helpful to the perforation optimum design.
采用挤密成孔夯实水泥土桩复合地基处理湿陷性地基，可以有效地提高地基承载力同时消除地基的湿陷性。
It can eliminate the collapsibility of the foundation and improve the bearing capacity that adopts the tamping soil-cement pile through squeezing to form pore.
冲挤花键孔的步骤可采用本发明所设计的专用模具在压床下完成。
The steps for punching and extruding the splined hole can be finished by a special die which is designed by the invention by a press.
本文在采用自平衡法静载荷试验的基础上，分别对浙江嘉兴和湖州两个工程中的同一场地挤扩支盘灌注桩与普通直孔灌注桩进行对比试验研究。
To study vertical bearing behavior of the foundation, a shaft diaphragm wall foundation of bridge in loess area was tested for bearing capacity by use of the self-balanced method.
通过设置静力释放孔、预钻孔取土减小压桩挤土效应。
Earth extrusion effect is alleviated by setting static force release perforations and pre-bored perforations during pile pressing.
由于试验挤土过程与孔扩张过程具有很好的相似性，故多采用柱形孔扩张理论对旁压试验机理进行分析。
The process of soil-squeezing is similar to cylindrical cavity expansion so that most of interpretation for SBPT is based on the theory of cavity expansion.
由于试验挤土过程与孔扩张过程具有很好的相似性，故多采用柱形孔扩张理论对旁压试验机理进行分析。
The process of soil-squeezing is similar to cylindrical cavity expansion so that most of interpretation for SBPT is based on the theory of cavity expansion.
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