Research on Retrieval Algorithm of CAPP System Based onManufacturing Feature of Aeronautical Structural Parts

Abstract

The aircraft structure is an important part of the air-frame, and its manufacturing process is complex. It is difficult to recognize the target in the computer-aided process planning(CAPP) system. According to the characteristics of structural parts, CAPP system is constructed based on manufacturing feature of air-frame parts to improve the production efficiency. 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 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 shows the feasibility and correctness of the algorithm in CAPP system.

Keywords

• aeronautical structural parts
• manufacturing features
• capp
• part classification coding system
• retrieval algorithm
• feature recognition