基于航空结构件制造特征的CAPP系统的检索算法研究

飞机结构件是机体骨架的重要组成部分,其制造工艺复杂,在CAPP系统中进行目标识别还存在较大困难。对常见的飞机结构件进行分类,从机械制造工艺的角度,归纳出六种制造特征,构建基于航空结构件制造特征的CAPP系统;在VC++6.0环境下,设计符合OPITZ标准的基于制造特征的编码系统,完成对目标零件的特征编码;设计用于目标零件与实体库零件之间进行特征识别的分步检索算法,实现目标零件与实体库零件的制造特征相似性对比。以某机型中含44个槽特征的框类零件为例,通过该算法程序进行特征自动识别,自动识别数为40个,自动识别率达到91%。结果表明:该算法可以在CAPP系统中进行识别,是正确且可行的。

Research on retrieval algorithm of CAPP system based on manufacturing feature of Aeronautical Structural Parts

In this paper, according to the characteristics of structural parts, CAPP system is constructed based on manufacturing feature of aeronautical structural parts to improve the production efficiency of aviation structural parts. Six manufacturing features are summed up according to the machining process by researching on classification of common aircraft structural parts. In the VC++6.0 environment, a coding system based on manufacturing feature is designed according to OPITZ standard. The step retrieval algorithm is designed for feature recognition about between target parts and entity library parts. The similarity of features is achieved between the target parts and the physical library parts. Taking the frame parts with 44 slots as an example, 40 Manufacturing features are automatically identified by the algorithm program. The automatic recognition rate is 91%. The result showed the feasibility and correctness of the algorithm in CAPP system.