Abstract: To deal with the mould quantitative casting over-pouring and spillage，based on the analysis of the

technological process and the control characteristics for a kind of auto molten bucket casting mechanism，under the condition without depending on system concrete models，a three stages casting was proposed to real-time control servo motor push-pull molten bucket casting production by the programmable logic controller（PLC）high-speed pulse output function. The control solves the spillage in the fast pouring stage，designs the uniform decreasing variable pulse to infinitely approximate the integral control process to solve the over-pouring and reach the quantitative casting pouring in the precise pouring stage. Simulation and experiment show that the control method effectively attenuate the disturbance and the pouring mechanism vibration phenomenon. Compared with the traditional control application of the molten bucket pouring，the designed control system have few adjusting parameters less over-pouring and spillage，and more convenient to be realized by the PLC.

      Key words: pouring device；automatic quantitative pouring；piecewise variable impulse；integral control