数控机床的联网通讯与程序管理应用实例

介绍了数控DNC的功能特点,机床联网的实施方案、系统维护以及应用实例。     

Research on virtual dynamic optimization design for NC machine tools

Virtual dynamic optimization design can avoid the repeated process from design to trial-manufacture and test. The designer can analyze and optimize the product structures in virtual visualization environment. The design cycle is shortened and the cost is reduced. The paper analyzed the peculiarity of virtual optimization design, and put forwards the thought and flow to implement virtual optimization design. The example to optimize the internal grinder was studied via establishing precise finite element model, modifying the layout of Stiffened Plates and designing parameters of the worktable, and using the technology of modal frequency revision and the technology of multiple tuned damper. The result of optimization design compared the new grinder with the original grinder shows that the entire machine＇s first orders natural frequency is enhanced by 17%, and the response displacement of the grinding-head has dropped by 28% under the first order natural frequency and by 41% under second order natural frequency. Finally, the dynamic performance of the internal grinder was optimized.     

串口通信在CAD/CAM系统中的设计与实现

串行口通信是终端与计算机或计算机之间进行数据通信的一种方式，在工业上发挥着重要的作用。具有传输距离远、传输稳定、简单实用等特点。论述了在三维造型软件平台上(JHSolid)的CAM模块中串口通讯的实现。应用VisuaI C 结合CSem aJPort类实现自动侦测串口、在数控机床与PC之间进行数据及文件的传输等功能，并讨论该系统的基本原理和具体实现。     

三角网格表面等残留高度刀轨生成算法

针对截平面法规划的三角网格表面的刀轨长度较长、加工表面残留高度不均匀的问题,提出一种基于改进截平面法的等残留高度刀轨生成算法.首先在估算刀触点轨迹线垂直方向曲率半径的基础上,计算刀触点轨迹投影线并对其进行修正,去除其中冗余的投影点;然后由修正后的刀触点轨迹投影线构造驱动表面,利用驱动表面和网格表面迭代计算刀触点轨迹线;最后由刀触点轨迹线计算无干涉刀轨.与截平面法生成的刀轨进行比较分析的结果表明,文中算法生成的刀轨长度较小且获得的残留高度保持均匀,适合于三角网格表面表示的复杂表面的精加工.     

用MasterCAM加工双金属材料链轮硬齿表面

运用MasterCAM软件对双金属材料链轮硬齿表面进行曲面三维造型,编程,并对链轮双金属材料硬齿表面进行曲面合理工艺设计,加工出了符合图纸要求的产品零件。阐述了MasterCAM软件在加工实例产品时编程的基本步骤,重点突出了其加工工艺和加工参数等关键问题。     

新型高速加工工具系统研究进展

综述了新型高速加工工具系统的发展过程、特点及应用情况,着重分析了NC5工具系统的刚度和承载能力、夹紧力、抗颤振能力及刀柄清洁等关键问题,展望了高速加工工具系统的发展趋势。     

基于图像的浮雕雕刻自动编程软件的开发

为了实现浮雕的数控加工,提出了基于图像的浮雕雕刻方法。该软件采用数字图像处理技术,结合丰富的加工参数选项,实现了浮雕雕刻的自动编程。经测试其生成的数控加工程序在数控机床上能够加工出令人满意的浮雕作品,同时配合仿真软件的使用,可迅速获得浮雕的加工效果和加工时间,有助于产品的生产与加工安排。     

利用卧式纤维缠绕机进行气瓶纵向缠绕试验

为解决纤维复合材料气瓶缠绕的问题,在卧式缠绕机上对气瓶纵向缠绕进行试验。根据纤维导向装置结 构设计,对缠绕运动方式的特点进行分析,建立纵向缠绕数学模型,计算出纤维缠绕角,通过NC 程序编程,实现 了卧式纤维缠绕设备在纵向缠绕时的自动化运动。试验结果表明：芯模上的纤维紧密排列不松散,符合CNG 气瓶缠 绕的精度要求,满足纤维复合材料气瓶缠绕的使用要求,验证了利用卧式纤维缠绕机进行纵向缠绕的可行性。     

UG软件在数控加工中的应用

数控加工技术已得到广泛应用,如数控铣削、镗削、车削、线切割、电火花加工等.为了使数控设备达到预期的加工效果,编制高质量的数控加工程序是必不可少的.利用UG软件建立零件的几何模型,可以交互式地模拟演示材料按数控刀轨数据被去除的过程,可迅速自动生成数控代码,缩短编程人员的编程时间,提高程序的正确性和安全性,降低生产成本,提高工作效率.     

Designing novel reversible BCD adder and parallel adder/subtraction using new reversible logic gates

Reversible logic has received much attention in recent years when calculation with minimum energy consumption is considered. Especially, interest is sparked in reversible logic by its applications in some technologies, such as quantum computing, low-power CMOS design, optical information processing and nanotechnology. This article proposes two new reversible logic gates, ZRQ and NC. The first gate ZRQ not only implements all Boolean functions but also can be used to design optimised adder/subtraction architectures. One of the prominent functionalities of the proposed ZRQ gate is that it can work by itself as a reversible full adder/subtraction unit. The second gate NC can complete overflow detection logic of Binary Coded Decimal (BCD) adder. This article proposes two approaches to design novel reversible BCD adder using new reversible gates. A comparative result which is presented shows that the proposed designs are more optimised in terms of number of gates, garbage outputs, quantum costs and unit delays than the existing designs.