Study on flow field during molding filling process of liquid metal with self-developed 32-channel rapid data acquisition system was carried out. The data acquisition system has the merit of high acquisition speed

high data accuracy

more test channel

easy data processing. It can scan all channels in 4. 8 ms and total numbers of sample data per channel reach 4500 points. System software was developed with C++language and object-oriented programming method

in which memory insufficient problem was solved with integer data storing

dynamic memory allocation and extent memory use. Mold filling process in sand casting and lost foam casting for aluminum alloy and spheroidal graphite cast iron is measured by using this system. Rapid Variation of temperature field during mold filling process is recorded successfully. Based on the recorded temperature-time variation rule in the measured points

the filling Sequence of molten metal in the mold could be derived.