Precision casting because of the special manufacturing process of casting surface easy to corrosion, rust after it is difficult to deal with, if not taken seriously, not only artifacts of anticorrosion ability is poorer, adornment sex is not good.The casting of decorative pattern and the production flow mark if we should be how to control will be better?Of course, we need to know is what reason then do action!     The reason:1, first enter the casting cavity of the liquid metal to form a very thin and not completely metal layer, by the metal liquid is then not leave traces.2, the mold temperature is too low.3, internal sprue inappropriate position of sectional area is too small and splash.4, the pressure acting on the liquid metal.Second, the prevention measures:1, improve the mold temperature.2, adjust the runner area or position.3, adjust the sprue speed and pressure.4, properly choose coating and adjust the dosage.
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