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The contact interface between the stator and the rotor tip of the spindle could be destructed when the spindle is rotating continually at high speed, which will cause strong noise and severe vibration. In order to reduce the sound pressure level of the noise generated by the rotating spindle, three different coating materials, that is, Al-Ti-Cr-C,...
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... unit cells of these coatings are shown in Figure 1. The mixed powders were preplaced on high-speed spindles. ...
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... structure and surface morphology of the spindles with three different coatings are shown in Figures 2 and 3. The complete 2D technical drawing of the experimental spindle is shown in Figure S1 in Supplementary Materials. ...
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... result is similar to that of Li Yang et al. [24], who studied the effect of Al/Cr composite coating on the hot corrosion properties of Ti2AlNb alloy, and Nam, J. et al. [10]'s study of friction coefficient on friction noise. Figure 10 shows the curves of the average sound pressure level of the four spindles. It can be seen that the sound pressure level of the Coating Ti-C spindle at each rotating speed is smaller than that of the other three spindles. ...
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... sound pressure level of the spindle with the coating is smaller than that of the untreated spindle except when the spindle speeds are 19,000 r/min and 20,000 r/min. As shown in Figure 11, the comparison of the maximum value of the sound pressure level of the noise produced by the four kinds of spindles at the experiment speed is similar to the average value. Among them, the sound pressure level of the noise generated by Coating Ti-C at multiple experiment speeds is smaller than that generated by other spindles at the same speed. ...
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Citations
... The specific parameters are as follows: (i) The society of automotive engineers (SAE) standard viscosity value is 5w30, which means the lubricating oil can withstand a low temperature of −30 • C, and the viscosity index of the lubricating oil is 30 at 100 • C. (ii) The kinematic viscosity is 10.96 m 2 /s at 100 • C and 61.85 m 2 /s at 40 • C. (iii) The sulphate concentration is 0.7%. The temperature of the testing room was maintained at normal room temperature of 20 ± 2 • C. Two types of self-lubricating coatings for YD4203C spindles were processed by Dongguan Jiuding New Materials Co., According to the method proposed in the published literature [12] of our previous work, the main content, coating thickness, hardness, and the coefficient of friction of the coated spindles, and hardness and the coefficient of friction of the uncoated spindles were tested before vibration experiments. Results showed that the self-lubricating coating 1's main components are Ti 80% and C 20%, with the thickness of one side of 3 µm, the average hardness of 2800 ± 18 HV, and the range of coefficient of friction from 0.09 to 0.2; self-lubricating coating 2's main components are SP270%, SP320%, C + 10%; with the thickness of one side of 2.5 µm, the average hardness of 2600 ± 16 HV, and the range of coefficient of friction from 0.06 to 0.1. ...
Strong vibration is the main factor leading to the spinning spindle failure, which is closely related to the spindle end configuration and surface coating. In this study, the effects of the spindle end configuration and surface coating on the vibration characteristics of spinning spindles are studied, the vibration tests were conducted on a multifunctional spindle test bench by using three different types of spindles without coating and the YD4203C pointed spindle with surface self‐lubricating coating under various high‐speed no‐load conditions. The results showed that the vibration phenomenon of the YD4203C pointed‐head spindle was slighter than that of YD6111FA frustum spindle and YD6100E flat‐headed spindle, this was believed to be because the increase in the end surface area could speed up the heat transfer, and the decrease in the bottom area of the spindle end could reduce the impact of the high‐speed oil and gas vortex on the vibration. In addition, the vibration characteristics of the coated YD4203C pointed spindles are significantly improved compared with the uncoated spindles. This study provides the experimental basis for the design and manufacture of spindles with low vibration.
