并联机床后置处理器的开发及实验研究

以六自由度6-TPS型并联机床为模型，阐述了机床控制数据的生成原理和流程；以此为基础，规划了后置处理器的功能和整体结构。对若干关键技术进行了研究和探讨，包括基于参数化二进制格式的内部数据传输，基于刀轴矢量的笛卡儿空间粗插补算法，三维和二维刀具半径补偿，刀位文件的预处理以及加工代码的词法和语法检查等。最后介绍了利用本系统进行的切削实验，验证了系统的工程实用性。     

Solar furnace surface treatment of plasma-sprayed thermal barrier coatings

An original process of superficial thermal treatment is described. This process has been successfully applied to partially stabilized yttria-zirconia coatings (ZrO₂-Y₂O₃) to increase the lifetime of the thermal barriers. A thin superficial layer was melted, and morphological transformations were observed. A microstructural comparison between as-sprayed layers and thermally treated layers is presented.     

有限元法工程应用探析

本文阐述了有限元法的分析过程及其在结构设计中的应用前景。     

有限元软件"试验台"的构建

本有限元软件试验台采用面向对象的混合语言编程，将有限元软件分为前处理、有限元分析和后处理3个独立的主模块，它们可以分别编译和调试，再用多进程通信或动态链接库方式结合在一起，3个主模块之间通过数据文件进行通讯，根据具体情况每个主模块又可包括几个可用菜单驱动的独立的功能分模块，以使有限元软件的各部分功能程序可独立编写、分别调试，然后在此试验台上作总体验证。     

基于UG/Post的并联机床数控后置处理器的开发

针对并联机床进行数控加工时，必须要有一个后置处理器将刀具轨迹数据变换成并联机床各轴的运动，在UG／Post的基础上，开发出了并联机床后置处理器，它可以用于六轴或七轴并联机床的数控后置处理，并在UG中被调用，直接读取UG生成的刀具轨迹数据并把它转换成驱动并联机床的数控程序。     

Post-processing of finite element results and prediction of the localized necking in sheet metal forming

We propose a method based on the linear perturbation technique to predict the localized necking phenomenon in post-processing of finite element results for the simulation of deep-drawing processes. Numerous numerical results compared to experimental ones show the validity of such an approach. Numerical investigations have been performed to demonstrate the good behaviour of this technique in front of the process parameters as the friction value between the sheet and the tools, the blankholder force value or the tools radius. The paper is concluded by the interesting perspectives offered by this approach.     

通用后置处理中生成固定循环加工指令

介绍了在通用后置处理系统中输出各种固定循环加工指令的实现方法。通过对当今主流数控机床编程手册进行研究，设计数控机床特性文件，该文件与刀位轨迹文件，刀具信息相结合就可以输出各类数控机床的循环加工代码。采用相同的实现方法。也可以实现其它数迭机床控制指令的输出。该系统已经在FUNAC，FIDIA，SIEMENS等数控机床进行成功的试验。     

线弹性问题的locking-free双参数元

文中运用双参数法提出了一个4参数的四边形非协调有限元,讨论了该单元对纯位移边界条件下的均匀介质线弹性方程的逼近问题.证明了在材料几乎不可压时单元对弹性问题的一致最优收敛性,数值试验验证了理论分析结果.并通过构造后处理算子,得到了超收敛结果.所有的分析结果都可以推广到三维情形.     

Laser shock processing of Al-SiC composite coatings

Laser shock processing (LSP) is a technique of surface treatment (similar to shot peening) in which laser-induced mechanical shocks develop compressive stresses in the material. The stresses are of sufficient intensity to modify microstructure and properties of the coatings. In the present study, laser shocks of power density of 5 to 8 GW/cm² power density, generated by means of a neodymium-glass laser, were used to treat Al + SiC composite coatings deposited by means of a HVOF spraying technique. The laser processed samples were metallographically prepared, and their microstructure was investigated by optical microscope and SEM. The latter was also used to investigate the surface morphology of the laser treated specimens. Finally, the microhardness and oscillating wear resistance of the coatings were tested and compared to data obtained for as-sprayed samples.     

TiAlN涂层刀具研究新进展

TiAlN涂层具有硬度高、氧化温度高、热硬性好、附着力强、摩擦系数小,导热率低等优良特性。作为一种性能优异的新型涂层材料,TiAlN涂层成功的替代了TiN涂层,具有极其广阔的应用前景。对TiAlN涂层的特性、TiAlN涂层刀具的应用,TiAlN涂层刀具后处理技术以及其研究进展与发展趋势做了系统介绍。