31 m空气循环淬火炉计算机温度控制系统

来源期刊：中南大学学报(自然科学版)2004年第2期

论文作者：周立宏 喻寿益 贺建军 周璇 桂卫华

文章页码：285 - 289

关键词：淬火炉;占空比; PID

Key words：quenching furnace; duty circle; PID

摘    要：受大型淬火炉体积、结构、加热方式、保温性能、室温等诸因素的影响,炉内温度的均匀性、稳定性和控制精度难以达到工艺要求,为此,以某铝业集团公司31 m空气循环淬火炉温度控制系统为研究对象,采用双层炉体结构,均匀分布多个加热器和温度检测元件,以空气循环和辐射传热2种传热方式传热,采取智能增量式PID控制算法由PLC和计算机以PWM方式进行分区控制。实践结果表明,给定温度在铝合金淬火温度范围450~550℃之间取值时,系统升温超调量小;在保温阶段,炉内温度不均匀性为-3~3℃,炉温稳态误差为-1~1℃,达到了航空航天铝合金大型构件淬火炉温度控制的高精度、高均匀性和高稳定性的要求。

Abstract: This paper aims at the temperature control of huge quenching furnace ,including its stability, uniformity and precision which are influenced by the factors such as bulk and structure of the furnace, method of heating, the capability of heat preservation, and the room temperature ,etc. This computer temperature control system of huge 31 mquenchingfurnace for aerial aluminum alloy work pieces belongs to an aluminum-processing group. Two-layer structure of furnace is employed ,the heaters and the detectors of temperature are scattered evenly in the furnace, air-circling and radiation are the heat-transfermethods ,and zone control is performed byPLC and computerwithPWMmode of intelligent and incremental PID control algorithm. The operation result of this system shows that ,when setting temperature is between 450℃and 550℃,or the range of aluminum-alloy work pieces quenching temperature, its overshoot is small ,the ununiformity of the temperature inside the furnace during the period of keeping temperature is from -3℃to 3℃,the steady-state error is from -1℃to 1℃. The technical requirements for the uniformity, the stability and the control precision of the temperature of quenching furnace are met very well.