Study on Abnormal Temperature Field of Slide/Roll Contact under Elastohydrodynamic Lubrication

A systematic numerical analysis of a slide/roll point contact under thermal elastohydrodynamic lubrication was carried out to disclose the formation mechanisms of the abnormal temperature field, while the factors influencing the abnormal temperature field of the slide/roll contact were also analyzed. It was found that the inlet high temperature rise was mainly attributed to the reverse flow shear heat and the positive compress work in the inlet region. The local outlet low temperature was attributed to the action of the negative compressive work, while the gentle temperature rise in the outlet region was caused by the weak shear heat functioning in the absence of the outlet negative compressive work. The inlet temperature rise became prominent with increasing load and entertainment velocity and was highly sensitive to the entertainment velocity change but almost independent on the slide-roll ratio variation. The maximum contact temperature preferentially appeared in the inlet region at high speed and low slide-roll ratio. The inlet temperature rise became prominent with increasing heat impact times of the rollers during one contact cycle, which might be harmful to the contact fatigue life of the rollers. It was suggested to retard the inlet temperature rising by reducing the amount of the inputted oil under the condition of ensuring lubrication performance.