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3. Installing the cores on the mold.
In permanent mold casting or gravity casting, the mold material is cast iron and steel, or other metal alloys are treated and formed into two or more than two patterns of the mold.

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4. Close and fixture mold is very important, so the worker must be skilled. The two or more than two patterns of the molds are usually clamped tightly together.

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5. Pouring molten aluminum to 150-200 °C (300-400 °F) to ease the flow and reduce thermal damage to the casting. Molten aluminum is then poured into the mold through a gating system, which decreases the chance of impurities in the aluminum. Molten aluminum should be poured at the lowest practical temperature in order to minimize the possibility of cracks and porosity.

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6. Once the aluminum has solidified the molds are opened and the casting is removed. The mold is then either cooled, or heated for another chill casting.

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7. Taking out the gravity die casting from permanent mold, the working of mould is finished, the cutting the raiser and pouring, then machining.

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1. In Dongrun Casting Aluminum foundry, there are 5 five people who are skilled pattern maker to build patterns, using wood, aluminum, or resin. As usually, 1 set mold including top pattern and bottom. If the structure of mold is very complex, there is a sliding block, named core too. Such cores, sometimes reinforced by wires, are used to create under cut profiles and cavities which cannot be molded with the cope and drag, such as the interior passages of housing or cooling passages in CAC tanks.

Description : 2. For our American project—flat on one side; ribs on other side, closed at the bottom and top together, be filled with prepared casting sand or green sand—a slightly moist mixture of sand and clay; The color is red, so aluminum sand casting is named red sand casting; if make cast iron, the color of sand is black, so iron sand casting is named black sand cast. The sand is packed in through a vibratory process or press process. The pattern is placed on the sand. Other sand is rammed over and around the pattern. Finally a cover is placed on the box and it is turned and unlatched, so that the halves of the mold may be parted and the pattern with its sprue and vent patterns removed. Additional sizing may be added and any defects introduced by the removal of the pattern are corrected. The box is closed again. This forms a "green" mold which must be dried to receive the hot aluminum. If the mold is not sufficiently dried a steam explosion can occur that can throw molten aluminum. Sand may also be bonded by chemical binders, such as furane resins or amine-hardened resins.

Description : 3. When we make sand moulds, there are some paths for the entrance of aluminum into the mold cavity constitute the runner system and include the sprue, various feeders which maintain a good aluminum 'feed', and in-gates which attach the runner system to the casting cavity. Gas and steam generated during casting exit through the permeable sand or via risers, which are added either in the pattern itself, or as separate pieces. To be free of any porosity, we will place filter screens on the sprues.

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4. When the aluminum is cool, break away the sand mold and remove the casting.

Description: 5. Finishing the casting, we will remove the sand on the casting by washing or shot blasting. Then future machining, such as drilling and tapping, milling, lathe work and grinding.