Precision casting is also called the lost wax casting, which I believe you should be familiar with it than I am, lost wax casting in pouring casting requirements of technical requirements and other factors in the process of control is very strict, because it can directly affect the quality of the casting, then lost wax casting pouring way have what kind of?One type, thermal gravity casting:This is lost wax casting of the most widely used a form of pouring, namely after the shell from the roaster, by pouring at high temperature.At this time in metal shell cooling slowly, can under the condition of the liquid filling mold, so the castings can replicate the shape of the cavity, improve the accuracy of the castings.But casting slow cooling in hot type can make coarse grains, which reduces the mechanical properties of castings.In the casting of the carbon steel casting, casting surface with a slower cooling also easy oxidation and decarburization, reducing the casting surface hardness, finish and dimensional accuracy.