航空发动机零件机加夹具快速装配设计系统研究与开发

发布时间：2018-09-06 07:58

【摘要】：航空发动机零件具有形状复杂、加工精度要求高、材料难加工的特点,导致其机加工艺较为复杂,工序数量较多,需设计大量夹具保证机加过程的顺利实施。随着航空发动机型号任务的不断增加,航空发动机零件机加夹具的设计任务也日益繁重,目前在航空发动机企业中,夹具设计人员首先需根据工序模型的几何信息和装夹要求,初步规划夹具结构,并进行夹具元件建模,在此基础上运用CAD软件的装配功能,指定约束类型,交互拾取大量几何元素建立元件间的装配约束并实施装配操作,完成夹具的设计,设计过程工作量大,设计效率低。本文针对航空发动机相似零件加工工艺和夹具相似度高的特点,根据航空发动机制造企业的具体要求,提出了一种基于装配特征的夹具的快速装配设计方法,在建立带有装配的典型夹具元件库的基础上,通过装配特征的识别、匹配,即可完成夹具元件装配设计,实现夹具元件的重用,提高夹具设计效率。本文的研究内容如下:1)通过研究装配特征的内涵,给出了夹具元件装配特征的定义,研究了装配特征的语义表示与其在模型中的存储方式,并结合其结构特点、装配信息与打孔信息,实现对夹具元件模型的装配特征定义;2)在装配特征的语义表示与模型存储的基础上,应用Teamcenter软件平台并结合Access数据库,设计了夹具元件库,实现了对库中存储的元件模型与装配特征信息的存储和管理;3)研究了装配特征的匹配方式及约束的创建规则,实现夹具元件的快速装配;通过分析元件在装配中与其他模型的干涉情况,并结合打孔属性信息实现了元件的自动打孔。4)应用C++和UG/Open API开发工具在UG平台上开发了航空发动机零件机加夹具快速装配设计系统,现已成功应用在国内某航空发动机制造企业中。
[Abstract]:The aero-engine parts have the characteristics of complex shape, high machining precision and difficult to be machined. As a result, the machining skill is more complex and the number of working procedures is more. A large number of jigs need to be designed to ensure the smooth implementation of the machining process. With the increasing of aero-engine task, the design task of aircraft engine parts and jigs is becoming more and more heavy. At present, the jig designers need to base on the geometric information and clamping requirements of the process model in the aero-engine enterprises. On the basis of this, the assembly function of CAD software is used to specify the constraint type, and a large number of geometric elements are picked up interactively to set up the assembly constraints between the components and carry out the assembly operation. The completion of fixture design, the design process of heavy workload, low design efficiency. In this paper, according to the requirements of aero-engine manufacturing enterprises, a rapid assembly design method of jigs based on assembly features is proposed, which is based on the high similarity of machining technology and fixture of similar parts of aero-engine, according to the specific requirements of aero-engine manufacturing enterprises. Based on the establishment of a typical fixture component library with assembly, the assembly design of fixture components can be accomplished by identifying and matching the assembly features, realizing the reuse of fixture components and improving the efficiency of fixture design. The content of this paper is as follows: (1) by studying the connotation of assembly feature, the definition of assembly feature of fixture element is given, the semantic representation of assembly feature and its storage method in model are studied, and the structural characteristics of assembly feature are combined. Assembly information and drilling information, the assembly feature definition of fixture component model is realized. On the basis of semantic representation and model storage of assembly feature, the fixture component library is designed based on Teamcenter software platform and Access database. The storage and management of component model and assembly feature information stored in the library are realized. The matching mode of assembly features and the rules of creating constraints are studied, and the fast assembly of fixture components is realized. By analyzing the interference of components with other models in assembly, Combined with the attribute information of punching, the automatic drilling of components is realized. C and UG/Open API development tools are used to develop the rapid assembly design system of the aircraft engine parts machine and fixture on the UG platform. Has been successfully applied in a domestic aero-engine manufacturing enterprise.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V263

【参考文献】