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Contour error–bounded parametric interpolator with minimum feedrate fluctuation for five-axis CNC machine tools

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Abstract

In this paper, a new generalized parametric interpolation method is proposed for optimized five-axis machining with the consideration of both the machine contour errors and the feedrate fluctuation elimination. An analytic processing is presented for linearization of contour errors with respect to feedrate limit. For machine configuration, explicit analytical modeling of the contour error and the tracking error with respect to feedrate is presented; thus, the error constraint problem is nicely converted to a kinematic constraint problem. On this basis, an accurate feedrate upper limit with confined contour errors is further determined by using a shifted Frenet frame with linear computational complexity. With the consideration of both the motion smoothness and machining efficiency, a time-based optimization algorithm is proposed for time-optimal feedrate scheduling. For eliminating the feedrate fluctuation, a new real-time interpolation algorithm is developed for free derivation between the path parameter and the arc length for smoothed five-axis tool path generation. Laboratory testing experiments were conducted for validation and were presented in the paper. And the experimental results indicate that the proposed feedrate interpolation method is capable of confining both the tool tip contour error and tool orientation contour error simultaneously, as well as maintaining a satisfactory interpolation performance in both computation efficiency and accuracy. The presented methods can be used for five-axis machining and the feedrate optimization of complex part machining.

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Acknowledgments

The authors thank Prof. Yuan-Shin Lee for his advice and effort in revising the paper.

Funding

This research was supported by the SCP (TZ2016006-0102) and NSFC (51525501).

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Authors and Affiliations

  1. School of Mechanical Engineering, Dalian University of Technology, Dalian, 116024, China

    Mansen Chen & Yuwen Sun

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  1. Mansen Chen
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  2. Yuwen Sun
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Correspondence to Mansen Chen.

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Chen, M., Sun, Y. Contour error–bounded parametric interpolator with minimum feedrate fluctuation for five-axis CNC machine tools. Int J Adv Manuf Technol 103, 567–584 (2019). https://doi.org/10.1007/s00170-019-03586-5

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  • DOI: https://doi.org/10.1007/s00170-019-03586-5

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