ACTA AERONAUTICAET ASTRONAUTICA SINICA >
A user defined method for machining features in NC programming of complex structural parts
Received date: 2016-08-30
Revised date: 2016-12-26
Online published: 2017-01-13
Supported by
National Natural Science Foundation of China Projects-Major Project Jointly Funded with China Aerospace Science and Technology Corporation (U1537209);Jiangsu Province Outstanding Youth Fund (BK20140036)
Machining feature is an effective way for machining process knowledge accumulation and reuse of complex structural parts of aircraft. Machining features of the same type are not completely identical, and are just alike in geometric shape and machining process. How to adapt to different enterprise resources, process levels, and types of structural parts in defining machining features is a difficult issue for automatic numerical control (NC) programming based on machining features. To address the issue, this paper proposes a user defined method for machining features in NC programming of complex structural parts. The geometric information is expressed by holistic attribute adjacency graph, and a flexible geometric information definition method is presented. The process information of machining features and its association with geometric information are established based on semantics and rules. The machining features are defined by users according to the factors of enterprise manufacturing resources, structure of parts, and programming preference of process engineers. A machining feature definition by users and automatic NC programming system of complex structural parts of aircraft are developed based on the proposed method, which has been successfully applied to NC programming of aircraft structural parts in a large-scale aviation manufacturing enterprise. Testing of many structural parts shows that accuracy of feature recognition can averagely be up to 97%.
LIU Changqing , LI Yingguang , WANG Pengcheng , HAO Xiaozhong . A user defined method for machining features in NC programming of complex structural parts[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017 , 38(6) : 420735 -420735 . DOI: 10.7527/S1000-6893.2016.420735
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