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Tool path generation for slow tool servo turning of complex optical surfaces

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Abstract

Slow tool servo (STS) turning is a superior process for machining precision and complicated surfaces that has already gained a wide application especially in optics industry. However, it is lack of systematically study of tool path generation for STS turning of complex surfaces, especially of interpolation among discrete cutting location points. This paper presents a comprehensive tool path generation strategy for STS turning of complex surfaces, including cutting location point optimized planning, trajectory interpolation, and machining simulation. First, cutting contact point discretization and tool geometry compensation were analyzed during cutting location point planning procedure. Second, Hermite segment interpolation used by trajectory interpolation was analyzed, and three position-velocity-time (PVT) entrance parameters algorithms were put forward, i.e., the constant speed method, area method, and the three points method. Third, the machining simulation was carried out to evaluate the performance of the generated tool path. The analysis of Z-axis motion characteristics indicated that both the area method (c = 2/3) and three points method can meet the requirements of smooth velocity of Z-axis when the Z-axis reciprocating frequency is similar to the C-axis rotating frequency. From the viewpoint of acceleration, the three points method is much better than the area method when the Z-axis reciprocating frequency is significantly greater than the C-axis rotary frequency. Finally, a progressive addition lens surface was fabricated to prove the feasibility of the proposed tool path generation method.

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Authors and Affiliations

  1. College of Engineering, Nanjing Agricultural University, Nanjing, 210031, China

    Xingsheng Wang, Xiuqing Fu, Chunlin Li & Min Kang

  2. Jiangsu Key Laboratory for Intelligent Agricultural Equipment, Nanjing, 210031, China

    Min Kang

Authors
  1. Xingsheng Wang
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  2. Xiuqing Fu
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  3. Chunlin Li
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  4. Min Kang
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Correspondence to Xingsheng Wang.

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Wang, X., Fu, X., Li, C. et al. Tool path generation for slow tool servo turning of complex optical surfaces. Int J Adv Manuf Technol 79, 437–448 (2015). https://doi.org/10.1007/s00170-015-6846-3

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  • DOI: https://doi.org/10.1007/s00170-015-6846-3

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