Test on technological parameters of sand castings

Preheat the mold with natural gas flame, then spray paint on the surface, and raise the temperature to about 300 ℃. Pour the melted ZL102 alloy liquid into the mold, take out the sand casting after solidification and forming, and check the surface quality and size of the casting.

Use UT302A infrared thermometer to measure the preheating temperature of the metal mold and observe the relationship between the temperature and the defects of the sand casting. See Table 1 for the results. It can be seen that 300~350 ℃ is appropriate.

Local cold shutNoneNoneNoneSlight surface porositySurface porosity

The XCZ-101 dynamic coil thermometer and thermocouple are used to measure the temperature of molten aluminum. The relationship between pouring temperature and sand casting defects is shown in Table 2. It can be seen that 680-710 ℃ is the appropriate pouring temperature range.

UnderpouringLocal cold shutNoneNoneBasically free of defectsAir hole on inner cavity surface

See Table 3 for the results of the cooling time test of the mold. It can be seen that 70~90 s (summer) or 40~60 s (winter) is a suitable cooling time range for sand castings after pouring.

Mold retention time in summer/sMold retention time in winter/sCasting defects
6030Hot cracking
7040Basically free of defects
8050Basically free of defects
9060Basically free of defects
10070Difficult to take out or deformed or damaged