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Effect of a cooling unit on high-speed motorized spindle temperature with a scaling factor

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Abstract

Forced cooling, as an efficient way of heat dissipation, significantly affects the spindle temperature. Although a full cooling passage was factored into the finite element analyses by some scholars, often only the model for the front/rear of a spindle is need for the purpose of the thermal evaluation simplification and data overhead reduction in engineering. For this, we devote to exploring how the coolant passage affects the heat dissipation of the front/rear halves of spindles by a constructed scaling factor, and accordingly create a simpler thermal evaluation model of spindles. Firstly, the experiments about a coolant unit effect on the thermal performance of spindles were first implemented, and thus, the temperature difference was noticed under various coolant parameter settings. Through the regressive analysis on the test data, the peak temperature area along axial direction was found and then the scaling factor was proposed to describe the effect of a cooling system on the temperature field of the front/rear half spindle. A similar structural coefficient, meanwhile, was also set up to state clearly the role of motor armature heating in the spindle temperature rise. Next, the thermal equivalent convection for a coolant passage was modeled based on the thermal resistance theory. Based on the abovementioned work, we planned a novel thermal network for only the front half of a motored spindle, in which the cooling mechanism was integrated, and the structural constraints were considered by the aid of the proposed scaling factors. Finally, the simplification and solution for this developed thermal grid were done, and the corresponding numerical results were compared with the test values. At the same time, the bearing heating with no or only 50% of a coolant unit, for the sake of better contrast and validation, was also simulated. The comparison results are indicative of a better agreement with real values when the proposed scaling factors are employed to considering the cooling unit impact on the high-speed motorized spindle temperature.

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Funding

This work was funded by the Natural Science Foundation of Jiangxi Province, China (no. 20212BAB204033), the National Natural Science Foundation of China (no. 51775277), and the National Science and Technology Major Project of the Ministry of Science and Technology of China (no. 2015ZX0401002).

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Authors and Affiliations

  1. College of Mechanical Engineering, Jinggangshan University, 343009, Ji’an, People’s Republic of China

    Zheng De-xing

  2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, 210016, Nanjing, People’s Republic of China

    Zheng De-xing & Chen Weifang

Authors
  1. Zheng De-xing
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  2. Chen Weifang
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Contributions

Zheng De-xing is the main contributor to this paper. He implemented the experimental studies and next proposed the structural scaling factor to describe the role of a coolant unit in spindle temperature. This factor was also integrated into the developed thermal grid model for the front half of motorized spindle. Meanwhile, he validated the proposed structural scaling factor by comparing the simulation with test results. Chen Weifang gave some valuable comments in improving the technical route of this work.

Corresponding author

Correspondence to Zheng De-xing.

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De-xing, Z., Weifang, C. Effect of a cooling unit on high-speed motorized spindle temperature with a scaling factor. Int J Adv Manuf Technol 120, 2559–2572 (2022). https://doi.org/10.1007/s00170-022-08958-y

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