板坯Φ230 mm支撑辊周期性热负荷模拟分析

Simulation analysis of slab Φ230 mm support roller under periodic heat loading

板坯支撑辊是板坯连铸机的重要组成部分,支撑辊轴承位的温度及辊面温度直接决定了支撑辊能否正常运行。为了探明转动过程中辊子各部位的温度分布规律,对板坯Φ230 mm支撑辊周期性转动过程中的辊子传热过程进行了模拟研究。结果表明,板坯Φ230 mm支撑辊在连铸过程中受板坯辐射、冷却水及空气散热影响,在连铸约1 500 s时温度达到稳态,且在有冷却水影响时辊子投影向空气侧半圆中部温度为250℃左右,在无冷却水影响时温度为270℃左右;在有冷却水影响时辊子投影向板坯侧半圆最高温度为272.3℃,在无冷却水影响时温度为290.0℃左右。通过与实测数据对比,证明本文计算模型能很好地预测连铸支撑辊的温度分布,可为其设计提供理论支持。

Slab support roller is an important part of slab caster, the temperatures of the support roller at the bearing position and roller surface directly determine whether the support roller can operate normally. In order to find out the temperature distribution of each part of roller during the rotation, the heat transfer process of roller during the periodic rotation of slab Φ230 mm support roller was simulated. The results show that the temperature of slab Φ230 mm support roller reaches a steady state after 1 500 s of continuous casting under the influence of slab radiation, cold water and air heat dissipation. And the temperature of the roller projecting to the middle of semicircle on the air side under the influence of cooling water is about 250 ℃, while the temperature is about 270 ℃ without the influence of cooling water. Under the influence of cooling water, the maximum temperature of the roller projecting to the slab side semicircle is 272.3 ℃, while the temperature is about 290 ℃ without influence of cooling water. By comparing with the measured data, the results show that the calculation model can predict the temperature distribution of roller well and provide theoretical support for the design of continuous casting support roller.