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以Fluent 6.3为计算平台,采用数值模拟的方法研究了铜结晶器下浇注温度和拉坯速度等参数对高速钢复合轧辊连铸坯内温度分布的影响,探求了适宜的连铸工艺条件,在此基础上进行了拉坯实验,结果表明,拉坯速度和浇注温度是决定铜结晶器下辊坯能否顺利拉出和界面结合质量好坏的两个重要参数,提高浇注温度和增大拉坯速度都利于实现两种金属之间的冶金结合,但随着高速钢浇注温度的提高和拉坯速度的增大,辊坯的液穴深度逐渐增长,离开结晶器时的坯壳减薄,拉漏的几率增大,拉坯速度和浇注温度之间存在着严格的匹配关系,适宜的浇注温度位于1873—1923 K之间,适宜的拉坯速度位于0.3—0.5 m/min之间,数值模拟和实验结果都表明,在参数匹配得当的情况下,采用铜结晶器连铸法可以制备出高速钢复合轧辊.
Using Fluent 6.3 as the calculation platform, the effects of parameters such as pouring temperature and casting speed on the temperature distribution in the high speed steel composite roll are studied by numerical simulation. The suitable conditions of continuous casting are explored. Based on this, the drawing experiments were carried out. The results show that the casting speed and pouring temperature are two important parameters that determine whether the roll blank can be smoothly pulled out and the interface quality is good or bad. The pouring temperature is increased and the pouring temperature is increased Billet speed is conducive to the metallurgical bonding between the two metals, but with the increase of high-speed steel pouring temperature and casting speed, the depth of liquid hole of roller billet gradually increases, There is a strict match between casting speed and pouring temperature. The suitable pouring temperature is between 1873-1923 K, the suitable casting speed is between 0.3-0.5 m / min, the value Both simulation and experimental results show that the high speed steel composite roll can be prepared by copper mold continuous casting method with proper parameter matching.