摘要
目的为了获得不同工艺条件对高温合金熔模铸造型壳在预热及转移过程中温度分布的影响规律。方法根据实际工况设计了测温实验方案,采用热电偶测温的方法研究型壳在无保温措施、外加保温棉、填砂以及保温棉复合填砂4种工艺条件下对型壳在预热及转移过程中温度分布的影响。获得了型壳升温、保温和转移过程中的温度场变化曲线,并根据实际测温曲线采用ProCAST的反算模块对关键位置的界面换热系数进行了计算。结果型壳外加保温材料后导致升温时间范围从原本的1.5 h升高到2.5~5.6 h,同时冷却时间也随之增加。结论在转移过程中,外部材料的换热方式均从自然对流转变为强制对流,换热强度增大,静置于铸型室后,换热方式恢复至稳定的自然对流方式,界面换热系数趋于稳定,且冷却曲线呈线性降低。
The work aims to obtain the influence laws of different technological conditions on the temperature distribution of high-temperature alloy investment casting mold shell during preheating and transfer. The temperature measurement schemes were designed according to the actual operating conditions. Thermocouple temperature measurement method was used to study the effect on temperature distribution of mold shell during preheating and transfer under four technological conditions of no insulation measures, addition of insulation cotton, sand filling and composite sand filling with insulation cotton. The variation curves of temperature field were obtained during the process of heating, heat preservation and transfer of mold shell. In addition,the interface heat transfer coefficients of the key structure were calculated by the inverse model of ProCAST according to the actual temperature measurement curve. The results showed that adding insulation materials to the mold shell led to an increase in the temperature range from 1.5 h to 2.5-5.6 h, and the cooling time also increased. During the transfer process, the heat transfer mode of external materials changes from natural convection to forced convection, and the heat transfer intensity increases.After the mold shell is placed in the mold chamber, the heat transfer mode returns to a stable natural convection mode, the interface heat transfer coefficient tends to be stable, and the cooling curve decreases linearly.
作者
郑行
郝新
闫彬
刘国怀
王晔
郭钊
王昭东
ZHENG Hang;HAO Xin;YAN Bin;LIU Guo-huai;WANG Ye;GUO Zhao;WANG Zhao-dong(AECC South Industry Company Limited,Zhuzhou 412002,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;School of Materials Science and Engineering,Harbin University of Science and Technology,Harbin 150008,China)
出处
《精密成形工程》
北大核心
2022年第1期141-146,共6页
Journal of Netshape Forming Engineering
关键词
熔模精铸
高温合金
型壳预热
界面换热系数
温度测量
investment casting
superalloy
preheating of mold shell
interface heat transfer coefficient
temperature measurement
