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| Generating algorithm of multi-axis NC engraving-path for triangular mesh model
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| School of Mechanical Engineering, Shandong University of Technology, Zibo, Shandong 255091, China) |
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Abstract In order to solve the problems of inefficiency and interference in multi-axis NC engraving tool path generation for triangular mesh model, an algorithm was proposed based on triangular mesh model. R*S tree dynamic space index structure was adopted to organize the topological neighbor relationship of triangular mesh. According to the surface feature of the triangular mesh surface model， the tool-position driving point was mapped out to obtain the transient processing area of each dive point. Based on the tangency relationship between the cutter and the triangles in the instantaneous processing area, the interference-free cutter location points were calculated by the calculation methods of surface tangent, vertex tangent and edge tangent. In order to meet required precision, interference-free multi-axis NC engravingpath could be achieved before limit machining error detection between the adjacent cutter location points and precision control by dichotomy. Experimental results show that the algorithm is efficient for the accurate and fast generation of interferential-free multi-axis NC engraving tool path of complex triangular mesh model.
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2011, Vol. 32 
