Abstract
The kinematic accuracy of the target part is an important evaluating indicator of the mechanical product quality. This paper proposes a novel kinematic accuracy analysis method based on the deviation propagation and small displacement torsor (DP-SDT) theory. Meanwhile, two new algorithms are presented. One is the semantic-based exploring algorithm which is presented to solve the influence of the force direction and vibration on the deviations; the other is the displacement-transformation algorithm which is to synthetically describe the generated deviations from motional displacement. Based on the above algorithms, an improved DP-SDT kinematic accuracy analysis method for dynamic geometric model is proposed to simulate the kinematic performance of the product considering the deviations caused by manufacturing, motion, force direction, and vibration. Comparing with the typical methods, the proposed method can predict the kinematic performance of the product in the design phase rather than in the pilot phase, which can greatly reduce the experimental manufacturing cost. Besides, the proposed method can also provide a new application field for tolerance analysis methods. A case study on the kinematic accuracy analysis of a lathe saddle is provided to verify the performance of the proposed method.
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Acknowledgments
The authors gratefully acknowledge the financial support from the National Key Technology R&D Program of China under the Grant No. 2015BAF17B00, and the National Science and Technology Major Project of China under the Grant No. 2014ZX04014101.
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Zhou, X., Li, H. & Zhu, H. A novel kinematic accuracy analysis method for a mechanical assembly based on DP-SDT theory. Int J Adv Manuf Technol 94, 4301–4315 (2018). https://doi.org/10.1007/s00170-017-1105-4
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DOI: https://doi.org/10.1007/s00170-017-1105-4