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�������պ����ѧѧ�� 2009, Vol. 35 Issue (2) :146-150    DOI:
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÷����1, �� ��2, ������1*
1. �������պ����ѧ ��е���̼��Զ���ѧԺ, ���� 100191;
2. �ɶ��ɻ���ҵ(����)�������ι�˾ ���칤�̲�, �ɶ� 610092
Analyzing and controlling distortion of aircraft aluminium alloy structural part in NC machining
Mei Zhongyi1, Gao Hong2, Wang Yunqiao1*
1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
2. Manufacture Engineering Department, Chengdu Aircraft Industrial Co. Ltd, Chengdu 610092, China

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Abstract�� NC machining distortion and the reason which leads to machining distortion were studied by analyzing the typical aircraft wing rib aluminium alloy structural part on which distortion often occurs. The part NC machining distortion was analyzed and compared by using the methods of theoretical model, finite element analysis and milling experiment. Residual stress distribution was analyzed in the part. Temperature simulation was added to the residual stress distribution of aluminium alloy by using thermal-mechanical coupling analysis of the FEM(finite element method) software. The influence on part distortion by cutting material was analyzed and simulated. The cutting process was simulated and improved through using the improving static elements deactivation method. Simulation distortion result of machining process was compared with the milling experiments and practical experience data. The validity of the analysis method and the finite element analysis model was verified. Several methods which can be used to predict and control machining distortion were proposed.
Keywords�� numerical control machining   distortion   residual stress   simulation   finite element method 1 �������     
Received 2008-07-20;
About author: ÷����(1968-),��,�����ϲ���,������,meizhongyi@buaa.edu.cn.
÷����, �� ��,������.�ɻ����Ͻ�ṹ�����ؼӹ����η��������[J]  �������պ����ѧѧ��, 2009,V35(2): 146-150
Mei Zhongyi, Gao Hong, Wang Yunqiao.Analyzing and controlling distortion of aircraft aluminium alloy structural part in NC machining[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2009,V35(2): 146-150
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2009/V35/I2/146
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