The temperature of thin-fine core pin in die-casting mold is a major difficulty in the die-casting mold temperature control

which has significant effects on internal quality of the casting holes and service life of core pin. In order to solve such problems as the poor quality of small holes of die casting and deformation

soldering and fracture of thin-fine core pin

the control system of core pin cooling based on PLC and touch screen technology has been developed. High pressure cooling water combined with air blowing was used to decrease the temperature of the core pin in the system. The cooling water has the characteristics of independent

closed and circular. The hardware system was designed through the "PLC + touch screen" technology

in which PLC was the host computer

embedded touch screen combined with A/D conversion module as the core of whole system. The software system was composed of PLC control program and configuration system. Production and application results show that core pin temperature exhibits a lower fluctuation and service life is increased greatly after using the system. Meanwhile

casting quality is improved and the reject rate is reduced to below 2%. The advantages of the system include convenience for display

visualized

simple interface and stable and reliable controlling.