Tribological Performance of Gate Bottom Pivot Friction Pair QT600-3/40Cr and Its Wear Surface Power Spectral Density Characterization

doi:10.3901/JME.2019.17.102

Abstract

Abstract: In order to study the effect of contact stresses on gate bottom pivot friction pair QT600-3/40Cr under low-velocity heavy load condition, and the correlation among surface power spectral density, abrasion mechanism and velocity. The wear tests of the friction pair QT600-3/40Cr are carried out under the condition of grease lubrication with pin-disk contact under different contact stresses by means of the MMW-1A tester. The wear mechanism of QT600-3/40Cr is analyzed by scanning electron microscopy (SEM), and the wear surface of the sample is characterized by combining one-dimensional surface power spectrum density (PSD_ID) and two-dimensional surface power spectrum density (PSD_IID). The results show that the contact stress is increased from 10.6 MPa to 15.9, 19.1 and 21.1 MPa, the wear rate is increased by 11%, 109% and 592% gradually. On the other hand, the furrow phenomenon that appears on the damaged surface is gradually serious and the wear form is abrasive wear. At the same time, the PSD_ID and the PSD_IID values are increased, with the maximum PSD_ID value increasing by 22%, 94% and 598% respectively, showing the same trend as the change of wear rate. The PSD_ID is mainly concentrated in the space frequency range from 0-0.0075 μm^-1, the PSD_IID graph has obvious trend peak distribution. The wear surface of the pin sample has obvious dominant spatial frequency, it indicates that the wear surface morphology has certain similarity and the wear mechanism has not changed. Furthermore, the prediction results of PSD on wear mechanism and trend are consistent with the SEM results, which can be used to assist analysis of QT600-3/40Cr friction pair wear mechanism and trend.

Key words: gate bottom pivot, QT600-3/40Cr, tribological property, wear mechanism, power spectral density

CLC Number:

TG704

QIN Hongling, GUO Wentao, LI Xuefei, ZHAO Xinze, XU Xiang. Tribological Performance of Gate Bottom Pivot Friction Pair QT600-3/40Cr and Its Wear Surface Power Spectral Density Characterization[J]. Journal of Mechanical Engineering, 2019, 55(17): 102-109.

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