Foundry manufacturers, choose the appropriate pouring method

Casting parts manufacturers, choose the appropriate pouring method.

(1) The casting position should be as far as possible to make the main large surface in a vertical or inclined state, in order to facilitate the smooth filling of metal liquid, the plastic shape gradually evaporated, so that the air gap pressure is reduced and maintained balance.

2) The pouring system gives priority to the back cover injection, step or step injection to ensure the smooth flow of metal liquid and avoid a large amount of air entering the cavity during the pouring process.

(3) Increase the pouring temperature of metal liquid and reduce the pouring speed, which is conducive to full evaporation and rapid discharge of foam. The research shows that a series of casting defects such as porosity can be effectively reduced by increasing the casting temperature. The temperature during the casting process should be above 1600℃, and at this time, it should be ensured that the coating has a high temperature strength, otherwise it will cause more serious sticky sand.

(4) Adhere to the principle of "slow-fast-slow" water intake. First of all, a small flow of liquid metal is used to pass the straight runner, and a large flow of liquid metal at the gate is quickly filled to ensure the vacuum degree until the liquid metal in the cup is no longer sinking. According to the estimation of the amount of molten steel cast, when the liquid level is fast to the top surface of the casting, the pouring speed is slowed down to reduce the flow rate of the liquid metal, so that there are or intrusive gases in the liquid metal leakage or precipitation from the liquid metal.

The molten steel should be thoroughly removed before casting.

(1) To clean the charge, especially the seriously rusted charge, rust must be removed.

(2) Fast melting, shorten the high temperature melting time.

(3) The amount of aluminum is usually between 0.04% and 0.06%, or within 0.15%.

In addition, sand should be dry, do not use water or water.