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以Ansys 10.0和Fluent 6.3为计算平台,利用2者之间的接口和Fluent 6.3软件提供的用户自定义函数功能,研究了辊芯初预热温度、拉坯速度、预热和补热功率等因素对石墨铸型连续铸造复合成型法制备高速钢复合轧辊坯内非稳态温度场的影响,并对各工艺参数之间的匹配关系进行了探讨.结果表明,当辊芯表面的终预热温度一定时,所需的感应预热功率随拉坯速度的增加而增大,随初预热温度的升高而减小;辊芯移出线圈时,高温区仅限于表层附近,芯内大部分区域几乎不受感应预热的影响.进入预热坩埚后,随着辊芯的下移,辊芯表面能达到的最高温度及在固相线温度以上持续的时间随补热功率的增大和拉坯速度的减小而相应升高或增长;拉坯速度和补热功率之间存在严格的匹配关系,当2者匹配得当时,辊芯和外层高速钢之间可形成牢固的冶金结合.
Taking Ansys 10.0 and Fluent 6.3 as computing platforms, the interface between the two and user-defined function provided by Fluent 6.3 software were used to study the factors such as initial preheating temperature, casting speed, preheating and heating power The effect of graphite mold continuous casting composite molding method on the unsteady temperature field in the high speed steel composite roll blank was studied and the matching relationship among the process parameters was discussed.The results showed that when the final preheating temperature When the roller core moves out of the coil, the high temperature zone is only limited to near the surface layer, most of the core area Almost without the influence of induction preheating.When entering the preheating crucible, with the roll core down, the highest surface temperature of the roller can reach the solidus temperature above the sustained duration of heating power with the increase and pull The corresponding increase or increase of the speed decreases; there is a strict matching relationship between the casting speed and the heating power, and when the two are matched properly, a strong metallurgical bond can be formed between the roller core and the outer high-speed steel.