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在轧制温度为350℃,轧辊角速度约为3.14 r/s,壁厚压下量分别为20(4)、30(4)、40(4)的条件下,对尺寸为50 mm×7 mm×1000 mm的AZ31B镁合金管进行纵连轧热力耦合数值模拟,在相同温度不同压下量的轧制条件下,从轧制损伤的应力状态和温度场分布两方面对镁合金管材纵连轧的数值模拟结果进行了探索性研究。结果表明:在相同轧制温度条件下,随着压下量的增大,最大损伤值也随着增大,且最大损伤值均出现在轧辊的辊缝处。同时塑性变形产生的热量也增大,且因轧辊辊顶处和镁管间存在较大的热交换,所以辊缝处的温度要高于辊顶处,两者之间有一定的温度差,壁厚压下量越大则温度差越大。相同压下量条件下,纵连轧镁合金管的损伤程度要比镁合金板材轧制的小。
Under the condition of the rolling temperature is 350 ℃, the angular velocity of the roll is about 3.14 r / s, the wall thickness reduction is 20 (4), 30 (4), 40 (4) × 1000 mm AZ31B magnesium alloy pipe for longitudinal coupled numerical simulation of thermo-mechanical coupling, under the same temperature and under different rolling conditions, from the rolling damage of the stress state and temperature field distribution of magnesium alloy pipe longitudinal rolling The numerical simulation results were explored. The results show that under the same rolling temperature, the maximum damage value increases with the reduction, and the maximum damage value appears at the roll gap. At the same time the plastic deformation of the heat also increases, and because of the top of the roller and the magnesium tube between the larger heat exchange, so the temperature at the roll gap at the top of the roller at a certain temperature difference between the two, The greater the wall thickness reduction, the greater the temperature difference. Under the condition of the same reduction, the damage degree of the longitudinally-rolled magnesium alloy pipe is smaller than the rolling of the magnesium alloy plate.