提高电液锤锤杆使用寿命方法探讨

分析了电液锤锤杆的受力情况及影响锤杆断裂的原因 ,并提出了解决措施。     

Steric hindrance as a rate controlling step in stress corrosion cracking

The effect of steric hindrance in the stress corrosion cracking (SCC) of Ag-15Pd (a/o) in AgI forming solutions was studied at room temperature. The solutions used were 1 M KI at a potential higher than that of AgI formation, and iodine dissolved in different n-alcohols. It was found that Ag-15Pd (a/o) is susceptible to intergranular stress corrosion cracking in those solutions. The SCC susceptibility measured as percentage of elongation to rupture and crack propagation rate is related to the size of the active species. While in KI aqueous solutions, as well as in iodine saturated benzene or iodine saturated toluene, the rate controlling step (RCS) was the reaction at the tip of the crack, in alcoholic-iodine solutions, the diffusion rate of the iodine containing molecules became the RCS.     

螺栓轴向应力超声测量技术

简要介绍螺栓轴向应力超声测量的基本原理和测量方法，推导了螺栓伸长量和轴向应力的计算公式，介绍了测试过程中探头的选择、表面状态要求、温度补偿以及测量的适用条件。实际应用表明，该方法容易实施，测量精确度较高。     

The effect of corrosion inhibiting pigments on environmentally assisted cracking of high strength aluminum alloy

The effects of some corrosion inhibiting pigments on environmentally assisted cracking of 7075-T76 aluminum alloy were examined in 3.5% NaCl (pH=6.2) solution. In order to study the inhibition mechanism of these pigments in environmentally assisted cracking of aluminum alloy, electrochemical polarization tests were carried out in 3.5% NaCl (pH=6.2 and 3) and 0.1 M HCl solutions respectively with the presence and absence of these pigments. The results showed that the effects of the pigments on environmentally assisted cracking of aluminum alloy were exhibited mainly at crack initiation and the early stage of crack propagation. A nontoxic compound, composed of phosphate, molybdate, citrate, and thiazole/imidazole derivatives, was a promising pigment to inhibit environmentally assisted cracking of the alloy.     

液压缸结构设计的有限元法

采用有限元方法对液压机中的主液压缸进行结构设计。得到了详细的应力、应变分布云图及应力集中和最大变形的位置。根据分析结果，优化设计方案，并重新进行数值模拟，使设计达到要求。     

数控焊接机CNC系统软件的研究与实现

插补软件是ＣＮＣ系统软件的重要部分，本文以自行研制的ＳＫＨＪ－４焊接机８数控系统为例，重点就该焊机ＣＮＣ系统的插补软件，详细讨论了焊接轨迹插补算法理论，以及在ＣＮＣ软件开发方面应考虑的主要问题。     

球磨过程中的碰撞行为分析

本文通过对行星球磨过程的分析，研究了行星球磨过程中的磨球碰撞行为，建立了球磨工艺参数与磨球运动速度。平均自由程及碰撞频率的理论关系。结果表明：随球磨转速提高，磨球运动速度和碰撞频率将增大，装料量一定时，提高球料比，磨球运动速率和平均自由程都将减小，碰撞频率增大，装料量和球料比一定时，磨球半径愈小，磨球运动的平均自由程减减小，碰撞频率增大。     

压力容器无损检测--磁记忆检测技术

金属磁记忆检测是当前无损检测领域的一种新技术,可发现压力容器的应力集中区域,实现压力容器损伤的早期诊断。介绍了磁记忆检测的原理、标准现状、仪器要求及其在压力容器制造、检验过程中的应用,并对压力容器磁记忆检测存在的问题进行了探讨。     

提高16MnL宽冷弯合格率的研究

通过对16MnL宽冷弯性能不合格的原因进行分析、试验，提出优化生产工艺的方案。在生产中取得了良好的效果。     

应力时效对P110套管螺纹参数的影响

在Φ339.7mmP110高强套管研制开发中发现,螺纹加工完成后因应力时效引起管体端头直径的变化,导致螺纹参数随之变化。通过对调质处理并矫直的套管几何尺寸及螺纹参数的测量试验,测试出随时间推移钢管几何尺寸、螺纹参数的变化量,分析其变化趋势及程度。通过应力时效对钢管形体作用的机理分析,提出确保套管螺纹参数稳定的控制措施。