五轴数控加工商用后置处理软件若干技术的研究

发布时间：2018-03-18 01:27

本文选题：后置处理　切入点：五轴　出处：《华南理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：一般的CAD/CAM软件经过计算都已经得到了刀具轨迹的全部信息,但为了适应数控机床的要求,还要进行后置处理,以得到特定数控机床适用的数控加工代码。后置处理是根据数控机床及数控系统的相关信息,将各种CAM软件生成的前置刀位文件转变成特定数控机床系统可以识别的数控加工程序。后置处理直接影响零件的加工质量、效率以及机床的可靠运行。我国缺乏具有自主知识产权的商用后置处理软件,商用CAD/CAM软件及后置处理软件全靠外国进口,本文的研究与开发工作力求弥补这一缺口,具体研究内容如下： 1)研究了三大类型十二种结构的五轴联动数控机床的运动形式,并以A-C机床为例,详细分析了其运动模型,推导了在旋转轴存在偏置和加工工件偏置装夹的情况下的坐标转换公式,并将算法应用于软件中。通过数控加工仿真软件和实际加工两种实验方法验证后置处理算法的正确性。 2)详细分析了非线性运动误差的计算模型,并推导了最大非线性运动误差的计算表达式。分析了两种对非线性运动误差的控制方法：第一,在后置处理中,用自适应线性法对非线性运动误差进行校核控制；第二,激活数控系统的RTCP功能,可以有效的控制非线性运动误差。 3)设计了一个后置处理系统的生成方案,即要求输入刀位文件和数控系统特性文件来生成数控加工代码。为了使后置处理系统具有更强的适应未来各种需求变化的能力,在后置处理系统中设计和实现了一个脚本编译系统,以编译数控系统特性文件。详细分析了脚本编译器的设计开发过程,包括词法分析、语法分析、可执行代码的生成等。最后将本文的研究成果集成到国产CAD/CAM软件ZW3D中,从而完善我国具有自主知识产权的三维设计和加工一体化软件。
[Abstract]:The general CAD/CAM software has obtained all the information of the tool path after calculation, but in order to meet the requirements of the numerical control machine tools, it is necessary to carry out post-processing. The post-processing is based on the relevant information of the NC machine tool and the CNC system. The pre-cutter position file generated by various CAM software is transformed into a NC machining program that can be recognized by a specific NC machine tool system. Post processing directly affects the machining quality, efficiency and reliable operation of the machine tool. China lacks commercial post-processing software with independent intellectual property rights. Commercial CAD/CAM software and post-processing software are all imported from foreign countries. The research and development work of this paper tries to make up for this gap. The specific research contents are as follows:. 1) the motion forms of three types of 12 kinds of five-axis linkage NC machine tools are studied, and the motion model of A-C machine tools is analyzed in detail, taking A-C machine tools as an example. In this paper, the coordinate transformation formula is derived when the rotation axis is biased and the workpiece offset clamping is processed, and the algorithm is applied to the software. The correctness of the post-processing algorithm is verified by the numerical control machining simulation software and the actual machining experiment. 2) the calculation model of nonlinear motion error is analyzed in detail, and the calculation expression of maximum nonlinear motion error is deduced. Two control methods for nonlinear motion error are analyzed: first, in post processing, The adaptive linear method is used to check and control the nonlinear motion error. Secondly, the nonlinear motion error can be effectively controlled by activating the RTCP function of the NC system. 3) A generation scheme of post-processing system is designed, which requires the input of cutter position file and NC system characteristic file to generate NC machining code. In order to make the post-processing system more adaptable to the changing needs in the future, A script compiling system is designed and implemented in the post processing system to compile the characteristic files of the NC system. The design and development process of the script compiler is analyzed in detail, including lexical analysis, syntax analysis, generation of executable code and so on. Finally, the research results of this paper are integrated into the domestic CAD/CAM software ZW3D, so as to perfect the 3D design and processing integration software with independent intellectual property rights in China.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TG659

【参考文献】