摘要
通过分析多道次电塑性轧制过程中单脉冲周期内的轧制力波动数据,研究了电脉冲对轧制力的影响。通过对比单周期内的轧制力波动与脉冲波形,得到脉冲电流时间内电脉冲对轧制力的影响规律。对单周期内电流空窗期的稳态轧制力进行分析,得到电脉冲在整个轧制道次时间内对轧制力的持续影响规律。研究结果表明:电脉冲对轧制力影响的短程冲击特征只存在于脉宽段内,其原因仅与纯电塑性效应有关;电脉冲对轧制力影响的长程特征是由持续导入电脉冲的热效应累计造成的轧件温升导致的;电脉冲对轧制力影响的长程特征与短程特征在时间刻度上存在本质区别,必须严格区分;电脉冲对轧制力影响的长程特征导致的轧制力降低幅度大于短程特征导致的轧制力波动幅度。
Based on the analysis of the rolling force fluctuation data in single pulse cycle during multi-pass electro-plastic rolling,the influence of electric pulse on rolling force was studied.The influence law of electric pulse on rolling force in pulse current duration was obtained by comparing the fluctuation of rolling force and pulse wave in single cycle.By analyzing the steady rolling force of the current gap period in single cycle,the continuous influence law of electric pulse on rolling force in the whole rolling pass time was obtained.Research results show that the short-range impact characteristics of influence of electric pulse on rolling force only exist in the pulse current duration,and the reason is only related to pure electric plasticity effect;the long-range characteristics of influence of electric pulse on rolling force are caused by the temperature rise of rolled piece due to the accumulated thermal effect of continuous introduction of electric pulse;the long-range characteristics of influence of electric pulse on rolling force are essentially different from the short-range characteristics in time scale,which must be strictly distinguished;the reduction amplitude of rolling force caused by the long-range characteristics of the influence of electric pulse on rolling force is larger than the fluctuation amplitude of rolling force caused by the short-range characteristics.
作者
孙利娜
李强
李明
SUN Li-na;LI Qiang;LI Ming(School of Environmental and Chemical Engineering,Yanshan University,Qinhuangdao 066004,China;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2021年第2期7-13,共7页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51771163)。
关键词
电塑性轧制
轧制力
脉冲电流
热效应
electro-plastic rolling
rolling force
pulse current
thermal effect
