基于超磁致伸缩材料的非圆曲面形活塞销孔加工新型机构

To bear more loads for heavy truck pistons, the shape of heavy truck piston pinhole is often designed as noncylinder form. Current methods cannot meet the needs for precision machining on non-cylinder piston pinhole （NCPPH）. A novel mechanism based on giant magnetostrictive materials （GMM） is presented. New models are established for the servo mechanism, GMM, and magnetizing force of the control solenoid to characterize the relationship between the control current of the solenoid and the displacement of the giant magnetostrictive actuator （GMA）. Experiments show that the novel mechanism can meet the needs to perform fine machining on NCPPH effectively.     

基于现场总线的软件化开放式CNC体系结构

将现场总线引入控制系统的硬件体系结构。使每个外部设备都成为现场总线通信网络中的一个节点,构成基于现场总线的数控系统。使硬件安装和扩展方便,提高了系统的可靠性和控制精度结合现场总线的特点和开放式系统的要求,提出了一种基于现场总线的开放式CNC（Computer Numerical Control）系统的体系结构,该体系结构划分为应用层、控制层和设备层三个层次,对每一层的功能进行了系统的分析和描述。总线规范采用自主开发的实时串行总线技术,基于Windows2000操作系统平台,采用COM／DCOM技术的软件设计方法。实现数控系统的软件模块的重用与扩充。满足数控系统开放性的要求。