摩擦焊模块化测控系统实现

设计基于P89C51RD2单片机的摩擦焊机压力及转速两个测控电路模块,实现对惯性摩擦焊过程关键参数压力及转速的闭环控制.摩擦焊机液压系统控制阀采用可控性较好的电液比例溢流阀,由压力传感器对实际压力进行检测,检测信号进入压力测控电路模块,经A/D转换、运算处理及D/A转换后输入电液比例溢流阀,以实现对摩擦焊接过程压力的连续调节.焊机主轴电动机驱动器采用调速性能较好的变频器,主轴转速由光电旋转编码器进行检测,其脉冲信号直接进入转速测控电路模块,经运算处理及D/A转换后输入变频器,实现调速控制,使焊机主轴电动机可按照焊接工艺的要求得到稳定、准确的转速.实际生产应用表明,压力及转速控制系统工作稳定、操作方便、运行效果良好.

REALIZATION OF MODULARIZED FRICTION WELDING MEASURE AND CONTROL SYSTEM

The module of pressure measure control circuit and the module of rotation speed measure control circuit based on the microcontroller P89C51RD2 are designed. The closed loop control system of pressure and rotation speed which are two key parameters of inertia friction welding is achieved. The electro-hydraulic proportional relief valve which has a perfect controllable property is used in the hydraulic pressure control system of the friction welding machine. The actual pressure signal sampled by a pressure sensor enters the module of pressure measure and control circuit. Through A/D conversion, computation and D/A conversion, the signal is inputted to the electro-hydraulic proportional relief valve, so that the pressure in friction welding process could be adjusted continuously. The transducer which has a perfect property of speed adjustment is used for main axes motor drive of the machine.The pulse signal of the main axes rotation speed sampled by a photoelectric rotary coder enters the module of rotating speed measure and control circuit. Through computation and D/A conversion, the signal is input to the transducer, so that the main axes rotation speed could be adjusted steadily and exactly. The application of practical production indicate that the control system of pressure and rotation speed is very steady in working, convenient in operating, and has a good effect in running.