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A double circular arc fitting algorithm for CNC machining of non-uniform scroll components

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Abstract

Scroll compressors have been widely used in refrigeration and air conditioners. The manufacturing of scroll components with complex shape and of high precision constitutes a very important task in guaranteeing the performance of a scroll compressor. Uniform scrolls with constant wrap thickness may be availably machined by generating method. However, for the machining of non-uniform scrolls with variable wrap thickness, the generating method is no longer applicable. The current practice in the machining of non-uniform scrolls is to apply a numerical method using CAD/CAM software in a CNC milling machine. This process is data-intensive and the machining quality is not reliable as the tool path generated does not have G1 continuity. In this paper, the authors present a double circular arc (DCA) fitting algorithm for high-precision manufacturing of non-uniform scroll components. The proposed algorithm is validated by cutting experiments on a CNC milling machine, which incorporates the DCA fitting algorithm–based finishing machining and NC tool path code generation. Test results have shown that the application of DCA fitting algorithm to non-uniform scroll machining is effective, not only in decreasing the number of generated tool path points, but also with satisfied machining precision.

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Funding

This study is supported by the National Natural Science Foundation of China (Grant No. 51665035) and the fundamental research funds for the universities in Gansu Province (Grant No. 1302ZTC034).

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Authors and Affiliations

  1. School of Mechanical and Electronical Engineering, Lanzhou University of Technology, 287 Langongping Road, Lanzhou, 730050, People’s Republic of China

    Zaixin Wu & Tao Liu

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  1. Zaixin Wu
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  2. Tao Liu
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Correspondence to Tao Liu.

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Wu, Z., Liu, T. A double circular arc fitting algorithm for CNC machining of non-uniform scroll components. Int J Adv Manuf Technol 104, 4485–4495 (2019). https://doi.org/10.1007/s00170-019-04304-x

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  • DOI: https://doi.org/10.1007/s00170-019-04304-x

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