电子束钎焊温度模糊控制系统

将被焊工件温度模糊控制技术应用于电子束扫描钎焊中,所研发的系统集成了电子束焊接过程控制、电子束扫描轨迹控制、工件温度模糊控制、焊接数据高速采集与存储等多项功能.通过扫描轨迹的编辑与控制,可以适应各种形状曲线钎焊缝的温度场要求;在电子束对工件进行扫描加热的同时,通过温度采集装置实时得到被焊工件的温度信号并与设定值进行对比从而得到温度偏差及偏差的变化率作为模糊控制器的两个输入变量,以模糊控制器输出控制量调节电子束流大小,从而实现钎焊温度的闭环控制.控制系统具有响应速度快、稳定时间短、稳态误差小、超调量小等特点,表明在电子束钎焊过程中采用模糊控制技术可以得到非常理想的控制效果.

Electron beam brazing temperature fuzzy control system

The workpiece temperature fuzzy control technology was used in the electron beam brazing process.The system integrated EBW process control,electron beam scanning track control,workpiece temperature fuzzy control,welding data high-speed acquisition and storage.Through the programming and control of the electron beam scanning tracks,the energy input requirements of curve brazing joints with various shapes could be satisfied.During the scanning and heating process with the electron beam,the temperature signals of the workpiece were obtained on-line and compared with the set value,so as to get the error and the error change rate of the joint temperature,which acted as the two inputs of the fuzzy controller.The fuzzy controller gave appropriate control amounts according to its inputs to adjust the electron current,and the closed-loop control of brazing temperature was realized.The experiment results showed that ideal control characters could be obtained if fuzzy control technology was used in the electron beam brazing process.The control system had fast response speed,short settle time,small steady-state error and small overshoot.