球铁炉前热分析-共晶膨胀双曲线精密测量方法

doi:10.3901/JME.2016.06.065

机械工程学报 ›› 2016, Vol. 52 ›› Issue (6): 65-71.doi: 10.3901/JME.2016.06.065

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球铁炉前热分析-共晶膨胀双曲线精密测量方法

徐振宇, 李大勇, 马旭梁, 石德全, 王言峰

哈尔滨理工大学材料科学与工程学院哈尔滨 150040

出版日期:2016-03-15 发布日期:2016-03-15
作者简介:徐振宇,男,1982年出生,博士研究生。主要研究方向为球铁炉前质量检测与控制关键技术。E-mail：zhenyuxu2006@126.com;李大勇(通信作者),男,1958年出生,博士,教授,博士研究生导师。主要研究方向为铸造测控新技术及特种铸造装备。E-mail：dyli@hrbust.edu.cn
基金资助:
国家自然科学基金资助项目(51474082)

Precise Method for Testing Cooling Curve and Eutectic Expansion Curve of Ductile Cast Iron in Front of Furnace

XU Zhenyu, LI Dayong, MA Xuliang, SHI Dequan, WANG Yanfeng

School of Material Science &
Engineering, Harbin University of Science and Technology, Harbin 150040

Online:2016-03-15 Published:2016-03-15

摘要/Abstract

摘要： 为了实现球铁球化效果与铁液特性炉前快速评价,设计一种新型热分析-共晶膨胀双参数联合测量装置。该装置主要由圆柱形干型砂样杯、热电偶、膨胀杆、单侧线位移传感器等部分构成。将待测铁液浇入砂型样杯,通过热电偶和位移传感器可同时记录试样凝固的冷却曲线和径向膨胀/收缩线位移双曲线。分析新型装置的工作原理以及为提高检测精度而采取的膨胀杆自伸缩补偿方法。铸造车间实测结果表明,样杯内试样凝固过程的温度变化和径向线性尺寸变化均可通过新型装置实时精密记录。新型热分析-共晶膨胀双参数联合测量装置,不仅可以用于球铁球化孕育效果的球化率评价,而且可以用于铁液石墨球析出的动力学研究。

关键词: 联合评价, 球化效果, 球墨铸铁, 热分析-共晶膨胀双曲线, 铁液特性

Abstract: In order to realize rapid prediction of nodularization effectiveness and iron liquid characteristic for ductile cast iron in front of furnace, a novel experimental setup is designed for combined testing cooling and eutectic expansion linear displacement dual curves. This setup mainly consists of several components, including a cylindrical dry sand cup, a vertically located thermocouple, an expanding rod and a linear displacement sensor connected with the expanding rod. When pouring iron liquid into the sand cup, both the thermal and the diametric expansion/contraction linear displacement curves can be recorded simultaneously for the testing sample during solidifying process by the thermocouple and the linear displacement sensor, respectively. Additionally, the measurement procedure theory in solidification with respect to the new designed setup, as well as the calibration method for measurement offset caused by the expanding rod’s thermal expansion/contraction effect are analyzed. The experimental results measured in foundry plant show that both the cooling and the diametric dimension change curves during solidification for iron liquid sample are accurately registered on line. The new setup can be used for not only nodularity prediction of the nodularization and inoculation effectiveness, but also precipitation kinetics analysis of the graphite during ductile cast iron solidification.

Key words: combined evaluation, ductile cast iron, iron liquid characteristic, nodularization effectiveness, thermal-eutectic expansion dual curves

中图分类号:

TG143

徐振宇, 李大勇, 马旭梁, 石德全, 王言峰. 球铁炉前热分析-共晶膨胀双曲线精密测量方法[J]. 机械工程学报, 2016, 52(6): 65-71.

XU Zhenyu, LI Dayong, MA Xuliang, SHI Dequan, WANG Yanfeng. Precise Method for Testing Cooling Curve and Eutectic Expansion Curve of Ductile Cast Iron in Front of Furnace[J]. Journal of Mechanical Engineering, 2016, 52(6): 65-71.

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球铁炉前热分析-共晶膨胀双曲线精密测量方法

Precise Method for Testing Cooling Curve and Eutectic Expansion Curve of Ductile Cast Iron in Front of Furnace

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