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Requirements for Dies and Die Casting Process Settings for Aluminum Castings

May 30, 2023

During the production process of aluminum castings, the surface quality should be effectively controlled, and the roughness of the casting mold surface should comply with its relevant regulations. Aluminum castings are not allowed to have cracks, under casting, porosity, bubbles, and any penetrating defects.


Aluminum casting molds allow for defects such as scratches, dents, missing flesh, and network burrs. But the degree and quantity of its defects should be consistent with the standards agreed upon by both the supply and demand parties. The gate, flash, overflow port, separator, and ejector pin marks of the casting mold should be cleaned. But leaving traces is allowed.


If there are no special provisions in the drawing, the setting of the die casting process, such as the position of the top rod, the position of the parting line, the position of the gate and overflow port, etc., shall be determined by the production factory. Otherwise, it should be indicated on the drawing or agreed upon by the supply and demand parties. The surfaces of casting molds that require special processing, such as polishing, shot peening, chromium plating, coating, anodizing, chemical oxidation, etc., must be indicated on the drawings or agreed upon by both the supply and demand parties.

Aluminum castings usually use their sand molds effectively, and the raw materials for the sand molds are mainly sand, which is mixed with binders, water, etc. to a certain extent. The sand mold material must have a certain adhesive strength in order to be molded into the desired shape and be able to resist the erosion of high-temperature molten iron without collapse.


In order to create a cavity in the sand mold that matches the shape of the casting, aluminum castings must first be modeled with wood, known as a wooden mold. After the hot molten iron cools down, its volume will decrease. Therefore, the size of the wooden mold needs to be increased according to the shrinkage rate based on one inch of the original size of the casting, and the surface that needs to be machined should be correspondingly thickened.
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