辐照用小尺寸样品力学性能表征技术研究进展

由于辐照空间尺寸限制、降低样品放射性和提高辐照参数精度等原因,小尺寸样品被广泛应用于核反应堆材料的辐照后力学性能表征。本文就国内外小尺寸拉伸、冲击、断裂韧性、疲劳、蠕变和小冲杆等测试表征技术的研究现状进行了综合论述,分析了小尺寸样品测试中的关键影响因素以及数据归一化方法,总结了小尺寸样品存在的问题,并结合我国需求对小尺寸样品技术的发展进行了分析和展望,以期为小尺寸样品技术及测试分析数据进一步规范化和工程应用发展提供参考。     

FMEA在冲压模具设计中的应用

冲压模具在使用过程中有多种失效形式,而每种失效形式都和潜在的模具设计不合理有关。对此提出了在模具设计图样完成之前进行FMEA活动,并对如何建立FMEA进行了详细的论述,最后给出了实例。     

发动机罩内板修边冲孔模设计

通过发动机罩内板制件特点分析,应用三维参数化设计软件UG,进行了修边冲孔模具设计。阐述了模具设计过程,绘制了模具图,应用于生产中。     

铲式玉米精密播种机仿真及虚拟设计研究

为了克服传统播种机在地表覆盖和免耕条件下开沟播种中存在的问题，将铲式成穴器与倾斜圆盘勺式玉米精密排种器组合设计成铲式玉米精密播种机。在对铲式成穴机构成穴机理进行理论分析的基础上，实验研究了成穴器参数对成穴质量的影响，建立了穴孔长度、穴孔宽度和穴距与成穴器参数间关系的回归方程，并通过计算机仿真技术模拟分析了打穴铲的运动规律，为成穴器的设计提供了依据。通过实验研究建立了排种器排种质量与参数间关系的数学模型，并对参数进行了优化。利用Pro／E建模和装配，对铲式播种机进行了虚拟设计，并采用ADAMS对其工作过程进行了动态仿真。进而采用神经网络优化技术，确定了播种不同玉米种子时播种机的优化参数，为铲式玉米精密播种机的设计提供了系统的理论和方法。     

材料弹性模量小型冲压实验测试的理论公式

采用简化的薄板弯曲理论模型，导出了小型冲压弹性模量测试实验中弹性模量的一个理论计算公式，针对该公式误差较大的现象，采用有限元分析方法研究了误差产生的原因，并提出了该公式的修正方法，求得了修正系数，建立了一个新的弹性模量的计算公式。通过验证，该公式具有很好的精度和较好的普适性，可应用于小型冲压弹性模量测试实验。     

Irradiation embrittlement monitoring of WWER-440/213 TYPE RPVs

In the paper the main goals and progress of the surveillance specimen programme for the RPVs WWER-440/213 in Jaslovské Bohunice V-2 and Mochovce NPPs are presented. At Jaslovské Bohunice V-2, the standard surveillance specimen programme (SSSP) was finished and so-called ‘Extended Surveillance Specimen Programme’ (ESSP) was prepared on the base of its critical analysis. For first two units of the Mochovce NPP completely new programmes of irradiation embrittlement monitoring called ‘Modern Surveillance Specimen Programme’ is prepared. It is based on the experience with SSSP and ESSP as well as the recommendations of IAEA experts. This programme will serve for Mochovce NPP during all planned service life. The experience of ESSP application on the 3rd and 4th units in Jaslovské Bohunice V-2 NPP are presented in the paper too.     

组合模具在折弯机上的应用

介绍了组合模具在折弯机上的应用，并说明了模具的结构形式及其工作过程。     

继电器基板模具设计与制造

分析了继电器中的基板零件 ,对原模具结构存在的问题进行改进 ,并介绍了关键零件的加工工艺     

Acoustic Harmonic Generation Due to Thermal Embrittlement of Inconel 718

This paper describes an attempt to characterize the deterioration of a structural material's mechanical properties by nonlinear acoustics. In this particular case, the damage was caused by “thermal embrittlement” during which the material, here the nickel-based alloy Inconel 718, loses a significant fraction of its fracture toughness. Harmonic generation was the experimental method used to characterize the microstructural changes in the material as a function of exposure time at elevated temperatures. Tests were performed on two heats of Inconel 718 with slightly different chemistries, with one heat showing particular sensitivity of the fracture toughness to the elevated temperature exposure with corresponding higher changes in the nonlinearity parameter. As a mechanical measure of the fracture toughness deterioration, a small specimen punch test was used in which the ductility of a thin slice of material is determined. A clear difference between the two heats was noted in the metallographic examination, which is reflected in the harmonic generation as well as the punch test data. An explanation for the changes of the harmonic generation during the embrittlement process is speculative at the present time.     

汽车转向系统中固定架冲侧孔模具设计

分析了汽车转向系统中固定架的成形工艺，主要介绍了冲侧孔的模具结构设计。