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An interpolation method for the open CNC system based on EPM

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Abstract

A typical open computer numerical control (CNC) system should own the capability of being redeveloped easily and effectively, and any improvements of interpolation algorithm or machining technique could be put into practice by users conveniently. However, this is not always available in the current open CNC systems. To solve this problem, an interpolation method based on external profile mode (EPM) is introduced to improve the universality and the performance of an open CNC system in this paper. The method is realized with a rough interpolation in the PC host and a fine interpolation in the slave motion controller. With this method, various interpolation algorithms can be easily realized in the rough interpolation when machining complex contours. Meanwhile, the machining parameters during each interpolation cycle can be wholly determined by the host, so a real-time adjustment of machining parameters can be accomplished during the interpolation. The working principal of EPM is presented in this paper, and the realization of interpolation algorithms with the proposed method is described. A look-ahead algorithm for determining the machining parameters of each segment is implemented based on the length of segments in the rough interpolation. An acceleration/deceleration strategy with confined jounce is proposed in the look-ahead algorithm. The experimental results of specific profile interpolation show that the interpolation method based on EPM can make the open CNC system more universality and high performance.

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Authors and Affiliations

  1. The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, 310027, China

    Yu-an Jin, Yong He, Jian-zhong Fu & Zi-Chen Chen

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  1. Yu-an Jin
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  2. Yong He
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  3. Jian-zhong Fu
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  4. Zi-Chen Chen
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Correspondence to Yong He.

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Jin, Ya., He, Y., Fu, Jz. et al. An interpolation method for the open CNC system based on EPM. Int J Adv Manuf Technol 69, 405–416 (2013). https://doi.org/10.1007/s00170-013-5044-4

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  • DOI: https://doi.org/10.1007/s00170-013-5044-4

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