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。     

基于UGNX的五坐标数控编程后处理程序开发应用

针对UGNX平台下的五坐标数控铣削编程后处理程序开发,以PostBuilder为环境,详细介绍了其五坐标数控铣削机床的后处理程序开发的关键技术,包括PostBuilder后处理开发模式、五坐标机床运动学原理配置、TCL语言应用等方面,并以FIDIA KR214六坐标高速铣削加工中心的后处理开发为实例进行应用说明。     

五轴数控空间刀具半径补偿的实现

深入分析了空间刀具半径补偿矢量的计算方法,对实现该空间刀补矢量到五轴联动数控系统中做了算法的准备和验证,并以UG NX6.0生成的刀位文件(CLSF)为坐标数据来源和五轴联动A/C双转台机床为例,开发了一个专用后置处理软件,并通过在Vericut7.0上模拟和五轴联动机床上实际加工叶片,加工结果说明了该算法的正确性和软件的实用性。     

Postprocessor development for ultrasonic cutting of honeycomb core curved surface with a straight blade

When ultrasonically cutting honeycomb core curved parts, the tool face of the straight blade must be along the curved surface’s tangent direction at all times to ensure high-quality machining of the curved surface. However, given that the straight blade is a nonstandard tool, the existing computer-aided manufacturing technology cannot directly realize the above action requirement. To solve this problem, this paper proposed an algorithm for extracting a straight blade real-time tool face vector from a 5-axis milling automatically programmed tool location file, which can realize the tool location point and tool axis vector conversion from the flat end mill to the straight blade. At the same time, for the multi-solution problem of the rotation axis, the dependent axis rotation minimization algorithm was introduced, and the spindle rotation algorithm was proposed for the tool edge orientation problem when the straight blade is used to machine the curved part. Finally, on the basis of the MATLAB platform, the dependent axis rotation minimization algorithm and spindle rotation algorithm were integrated and compiled, and the straight blade ultrasonic cutting honeycomb core postprocessor was then developed. The model of the machine tool and the definition of the straight blade were conducted in the VERICUT simulation software, and the simulation machining of the equivalent entity of the honeycomb core can then be realized. The correctness of the numerical control program generated by the postprocessor was verified by machining and accuracy testing of the two designed features. Observation and analysis of the simulation and experiment indicate that the tool pose is the same under each working condition, and the workpieces obtained by machining also meet the corresponding accuracy requirements. Therefore, the postprocessor developed in this paper can be well adapted to the honeycomb core ultrasonic cutting machine tool and realize high-quality and high-efficient machining of honeycomb core composites.     

基于UGNX6.0的海德汉双转台五轴后处理研究

基于UGNX6.0软件平台,研究了海德汉双转台五轴后处理器的开发过程和方法。以哈默C20U五轴立式加工中心为例,详细地介绍了利用UG/Post创建海德汉五轴后处理的过程,并利用Vericut验证了该后处理的正确性。     

摆头转台加工中心五轴定位铣削的后置处理与仿真验证

在对东芝BTU-14五轴加工中心结构特性、东芝TOSS999控制系统特性以及五轴定位铣削编程特点进行分析的基础上,提出其五轴定位铣削的后置处理算法。在该算法基础上,利用Visual C++6.0开发出单独的后置处理程序,将加工刀轨的刀位文件处理生成东芝格式的G代码文件。为了验证后置处理程序的正确性,利用数控仿真软件Vericut 7.0建立机床的仿真模型,对后置处理程序生成的G代码文件进行仿真。     

Context in word recognition

Relatively low character error rates can often lead to prohibitive levels of word error rates. This paper examines several techniques for integrating an independent contextual postprocessor (CPP) into a full classification system. Using positional binary n-grams the CPP can correct many errors directly. In those cases where the correction process leads to ambiguity, the CPP can direct additional processing. Experimental results demonstrate that almost all of the derived improvement results from CPP-directed reclassification. This only requires that the CPP have the classifier likelihood fed forward to it. Therefore, a standardized CPP can be built independently of the rest of the classification system. An initial 45% word error rate is reduced to about a 2% word error rate and a 1% reject rate. Presence of a dictionary allows these figures to be reduced even further.     

基于Solid Edge三维数字模型的后处理问题研究

针对运用Solid Edge三维数字化造型后，转化为标准的二维视图过程中出现的一些问题，提出了用Soid Edge进行工程图设计时的后处理的概念，并对后处理过程中的内容进行了研究，对工程应用中遇到的一些问题提出了解决方案。     

基于UG NX7.5专用后处理器的开发与应用

以广州数控GSK 983M数控铣床为例,介绍了UG NX7.5软件中的二次开发工具NX PostBuilder7.5进行二次开发的一般方法,并定制了适合于GSK 983M机床专用的后处理器。实际证明,在UG7.5后处理时以该专用后处理器转换的NC代码能直接在GSK 983M上加工。     

用于铜箔设备的恒张力控制系统

以"铜箔后处理试验设备"为研究对象,详细论述了铜箔后处理机的表面张力控制原理;并设计了一套以可编程控制器为核心,以触摸屏为人机界面,以RS485总线为通讯的张力控制系统。生产运行证明,该系统运行稳定,控制精度达到要求。