Experimental Study on Mold Filling Process of Casting by Data Acquisition Apparatus

摘要

For computer simulation of mold filling and solidification of casting, it is necessary to monitor casting temperature at different positions simultaneously in order to verify simulation results. A 32-channel rapid data acquisition apparatus was developed to record the variation of temperature field on real time and all channels can be scanned one time within 5 ms. Object Oriented Programming (OOP) method and event-driven mechanism were employed to design the acquisition program. The system was used in temperature measuring during mold filling and solidification processes. Pouring experiments for aluminum alloy and S.G. cast iron were carried out by sand molds with and without lost foam pattern. Step-shaped castings were poured during the experiments and thermal couples were distributed in the mold cavity. Experimental results not only can show the temperature distribution of casting at different positions but also indicate the filling sequence of the fluid flow. If the measuring points are enough, experimental results of the flowing sequence could be close to the real case. The measuring results were used to verify the simulated result of filling and solidification processes.