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REALIZATION OF
MODULARIZED
FRICTION WELDING
MEASURE
AND CONTROL SYSTEM
WANG Xiaochuan1 XU Xiaoling2
(1. School of Mechanical Engineering, Chongqing Uni-versity, Chongqing 400044;
2. 59th Research Institute, China Weapon Industry, Chongqing 400039
)
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Abstract: 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 pres-sure 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.
Key words: Friction welding
Microcontroller
Pressure measure and control
Rotational speed measure and control
CLC No: TG434.1
Received 20060227, received in revised form 20061011
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