Relationship Of Cooling Rate And Grain Sizes In ZL205A Alloy

High-speed acquisition and manipulation temperature system for casting and cooling process is designed to analyze fluid, temperature field distribution and the relations of casting parts grain sizes and cooling speed.Temperature acquisition and analysis system is composted ADVANTECH industrial controlling computer and temperature acquisition hardware. The hardware is consisted of forty-eight channels, 100 KS/s speed, and twelve channels, 10 S/s speed, acquisition part. Hardware and software filter is used to remove thermocouple interference signal, and temperature is acquired through curve matching method. The system can provide some functions, for example, temperature date acquisition and preservation function, data filter, graph drawing, cooling speed calculation, eutectic temperature calculation, measurement of Hydrogen Content in melt.Through analyzing the relation of cooling rate and grain sizes, we can get, 5.2% Cu ZL205A has the largest grain size in sand mould casting, 5.2% Cu ZL205A containing 10% returns grain size improve 10 percent and don't need change cooling rate, the returns can be used as modificator and grain refiner. Cooling rate and grain size improve largely through adding chills in sand mould, Al chill has better effect than Fe chill. Cooling rate and grain size decrease with casting thickness grow.Through analyzing temperature and liquid field, we can get, liquid Metal fill mould smoothly under low casting rate, and Liquid Metal has some fluctuation. Cast piece can be manufactured through feeding from ingate to edge, because the temperature field decrease gradient. Casting mould will be got through the analysis.