Temperature Variation of Internal Oil Flowing Temperature-control Roller for Mg Alloy Rolling

doi:10.3901/JME.2022.08.143

Abstract

Abstract: During the process of Mg alloy strip rolling, the cooling of roller is an essential detail to guarantee the shaping quality. The manner of cooling by oil flowing inside the roller can ensure the temperature uniformity of roller surface, which facilitates the formability of the plate. However, due to the limitation of thermal conductivity of the roller itself, there is an obvious time delay in the response of surface temperature to the change of internal oil temperature. Based on the design and application of specific roller for Mg alloy rolling, mainly aims to obtain the temperature variation regularity of roller surface under different cooling manners and flow rates of cooling oil to provide theoretical foundation for the constant temperature control during Mg alloy rolling. The results show that temperature distribution trend along the axial direction on the roller surface is similar and a descending tendency from the operating side to the driving side is considerably exhibited. Based on obtaining the time delay trend of roll surface temperature drop, we establish a quantitative model of cooling time-delay characteristic of the specific roller for Mg alloy by means of nonlinear fitting. The model shows that there is a quadratic function relationship between the temperature drop delay time and the roller surface temperature.

Key words: Mg alloy strip rolling, heat conductivity, temperature uniformity, cooling time-delay characteristic

CLC Number:

F407
O351

FAN Qinhong, MA Lifeng, ZHAO Zhenbo, JIA Weitao, LE Qichi. Temperature Variation of Internal Oil Flowing Temperature-control Roller for Mg Alloy Rolling[J]. Journal of Mechanical Engineering, 2022, 58(8): 143-152.

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