【作者】 轩传桃；

【导师】 张家泰；

【作者基本信息】 哈尔滨工程大学 ， 机械制造及其自动化， 2003， 硕士

【摘要】 STEP-NC标准是STEP标准在计算机数字控制上的扩展，为如何将计算机数字控制(CNC)的加工信息增加到以STEP产品模式描述的零件文档设立了标准。本文在对STEP-NC标准进行了深入研究的基础上，通过对Unigraphics(UG)进行二次开发，开发了生成和验证STEP-NC文件的具体应用系统，实现了CAD／CAM的集成。它包括了前处理器(生成STEP-NC文件)和后处理器(验证STEP-NC文件)的设计及绘图软件UG下的用户界面设计。该系统通过标准数据格式的STEP-NC文件实现了各个CAM系统之间的兼容性，CAD／CAM一体化，从而最终实现CAD／CAM的集成化，促进了CIMS的实现。 为了便于读者了解STEP-NC文件的具体结构，进而理解整个系统的设计，我们在第二章概要阐述了STEP标准及STEP文件结构，在第三章简要介绍了STEP-NC标准的相关内容以及STEP-NC与STEP之间的关系。 在前处理器的设计中，主要围绕着STEP-NC文件内容的数据来源和具体内容的表达形式。在对STEP-NC标准的研究分析的基础上，本论文通过读取STEP AP214文件来获取零件的几何信息，在UG中进行零件的工艺规划，对UG进行二次开发来获得零件的加工信息，最后，按照STEP-NC的技术协议AP238的格式将这些信息写到STEP-NC文件中，由此完成STEP-NC文件的生成。 在后处理器的设计中，我们的主要目的是把STEP-NC文件转换成某种类型的数控机床控制系统的数据指令，以此来验证前处理器中得到的STEP-NC文件的正确性。 本系统的使用过程是这样的：在UG绘图软件绘制出零件图，并进行工艺规划，利用二次开发的功能输出STEP-NC文件，然后使用后处理器的转换，得到FANUC系统的数控指令，验证STEP-NC文件的正确性，最后的结果是令人满意的。STEP-NC标准不但实现了不同CAM系统之间数据的共享，而且为CIMS信息集成技术提供了CAD／CAM之间的标准接口。更多还原

【Abstract】 STEP-NC is the extension of STEP in compute numbered control, and it defines the standard for adding manufacturing information to part text file describing in STEP product schema. Based on researching deeply on STEP-NC, this paper develops an application system for generating and verifying STEP-NC through redeveloping Unigraphics. This system realizes integration of CAD and CAM. It includes Pre-Processor (generating STEP-NC file), Post-Processor (verifying STEP-NC file) and use interface in UG. This system realizes one body of CAD/CAM, and compatibility between CAM systems using the standard data format STEP-NC file. Furthermore it finishes the integration, and accelerates realization of CIMS.For the convenience of reader to understand the structure of STEP-NC, thus to know the design of the whole system, we outline the STEP standard and its file structures in chapter 2, and the context of STEP-NC and the relationship between STEP and STEP-NC in chapter 3.In the process of designing Pre-Processor, we emphasize the data source of STEP-NC and the format of describing these data in STEP-NC file. Based on analyzing STEP-NC standard, this paper gets the geometric data by reading STEP AP214 file, and manufacturing data through redeveloping UG after planning the part process, finally writes these information to STEP-NC file in the format defined by STEP-NC technical protocol, that is AP238. And now we finish the STEP-NC file.In the process of designing Post-Processor, our aim is converting STEP-NC file to some type CNC control code, and in this way verifying the STEP-NC file gained from Pre_Processor.This system is used like this: drawing the part in UG, and planning its process, and then getting STEP-NC file by the function redeveloped, at last converting STEP-NC file into control code of FANUC system. The result is satisfying. STEP-NC standard not only realizes sharing data between CAM systems, but also support CAD/CAM Interface for CIMS information integration.更多还原