摘要
目的控制钢轨在线热处理过程中钢轨头内的分布参数温度,使钢轨头等温转变为均匀的细珠光体组织。方法①将钢轨热处理过程中的分布参数温度系统处理成集中参数温度模型,并用逆模型控制方法进行控制;②采用对钢轨表面温度进行偏离度补偿的方法来测量钢轨集中参数温度;③提出了单元冷却器控制信号的切换速度与钢轨的运动速度一致的同步切换控制方法。结果表明初始温度在620-820℃随机分布的60 kg/m^2碳钢轨,6 s后钢轨断面平均温度偏差可以控制在±10℃范围内,符合实际工艺条件;解决了钢轨在线热处理中金相组织均匀等温转变的控制问题以及钢轨首尾温差和通长温度分布不均的控制问题。结论钢轨的等温转变温度是最重要的被控参数,等温转变温度越低,处理后的钢轨硬度越高。
Aim To control the distributed parameter temperature system in the rail online heat treatment process,making rail head isothermal changes into the uniform thin pearlitic structrure.Methods ①The distributed parameter temperature system is used to deal with the lumped parameter temperature model,using inverse model control methods control the rail temperature;② Measuring method of the rail lumped parameter temperature is to use the deviation degree to compensate the rail surface temperature;③ The synchronous switching control method of the unit cooler controlled signal,keeping in the cooler controlled signal switching speed with the rail move speed.Results The control problem of the metallurgical structure isothermal change is solved in the rail online heat treatment process.The control problem of non-uniform distribution of temperature from head to tail of rail is solved in the online heat treatment process.Simulation result in the carbon rail of 60 kg/m^2,initial temperature is in 620-820℃ of random distribution,6 seconds later,the average temperature error of rail section can be controlled within the range of ±10℃,the process conditions that correspond to reality.Conclusion The critical transition temperature in isothermal process is a significant control parameter.The lower the critical temperature is,the higher the rail rigidity（after heat processing） will be.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第5期729-733,共5页
Journal of Northwest University（Natural Science Edition）
基金
国家自然科学基金资助项目(60574084)
关键词
钢轨在线热处理
逆模控制
同步切换控制
偏离度补偿
等温转变
the rail online heat treatment
inverse model control
synchronous switching control
deviation degree compensating
isothermal change
