工序模型驱动的航空发动机零件机加夹具变型设计方法

航空发动机新机研制过程中设计更改频繁,导致机加夹具修改工作量大。为提高机加夹具设计对航空发动机零件设计变更的响应速度,基于产品主模型思想,提出了一种工序模型驱动的航空发动机零件机加夹具变型设计方法。通过分析航空发动机零件机加夹具的设计特点,明确航空发动机零件机加夹具结构与机加工序模型装夹特征之间的关联关系,在此基础上构建航空发动机零件机加夹具变型设计主模型;通过设计同构零件装夹特征映射算法,将工序模型与夹具变型设计主模型中的装夹特征自动关联,实现工序模型与夹具变型设计主模型之间的设计参数联动;针对夹具结构中各类元件的资源特性,给出了不同类型夹具元件的变型策略,以提高夹具变型设计中各类元件资源的重用水平。最后,以铣削机匣外型面的夹具为例,验证了本文所提方法的可行性。

A process model driven derivative design method formachining fixtures of aircraft engine parts

In the research and development of new aircraft engine,frequent aircraft engine design changes may lead to large amendment work quantity and lower design quality of machining fixture.To improve the response speed of machining fixture when aircraft engine design changes,a derivative design method is proposed for aircraft engine machining fixture design which is driven by the process model.The modeling approach is given after the characteristics of aircraft engine machining fixture are analyzed,then,the association between fixture and fixturing feature is confirmed,on this basis,the master tooling derivative model is established.Through designed the mapping algorithm for the fixturing features which are on the parts with similar structure,the fixturing feature of target process model and master tooling derivative model is associated automatically,and due to this fact,the design parameters linkage between target process model and master tooling derivative model are achieved.Accrording to the resource characteristics of different types of parts,the different derivative design strategies are proposed to improve the parts'reuse ration,Finally,the feasibility of this method are verified in a milling fixture design for aircraft engine casing.