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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
Fax:
86-571-87239571
Add:
No.9 Gaoguannong,Daxue Road,Hangzhou,China
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310009
E-mail:
meem_contribute@163.com
Abstract: The contour error is an important indicator for evaluating the machining performance of five-axis CNC machine tools. In order to calculate and predict contour errors of five-axis machine tools, a method based on Simulink digital twin (SDT) modeling was proposed. Firstly, taking the "S" shaped workpiece as the research object, the processing G code and tool position information were obtained by using UG, and the processing surface point cloud was calculated by utilizing the geometric relationship between tool position points and tools, considering tool trajectory and tool axis attitude. Ideal and actual processing surfaces were fitted based on NURBS curve fitting method. Then, the normal distance between the predicted point and the actual machined surface was calculated by using the Hoshoff distance, it was the contour error. At the same time, the over cut, under cut and singular point defects in the processing of non-developable ruled surface were predicted in the European space, and the contour error was 69 μm to 241 μm, indicating that the actual processing characteristics were consistent with the prediction results of the digital twin model. Finally, the residual sum of squares was utilized to evaluate the fitting accuracy, calculating the average contour error of the target surface. The research results demonstrate that the precision of five-axis contour error calculation is improved by 37%, with a 25% increase in computational efficiency compared to the Jacobian matrix method. The forward and reverse calculation errors are within ±0.6 μm, validating the effectiveness of the proposed method, which can provide a certain reference for subsequent machine tool digital twin modeling, contour error computation and compensation enhancement.
Key words: profile error of five-axis machine tools; Simulink digital twin(SDT)model; tool trajectory; tool axis attitude; Hausdorff distance; side milling of cylindrical milling cutter
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2010 Zhejiang Information Institute of Mechinery Industry
Technical Support：Hangzhou Bory science and technology
