By pouring molten metal into the molding cavity, Guangdong foundry machinery works can produce almost any desired shape of metal products. When the metal solidifies, the mold is removed. This technology was mastered thousands of years ago when it was discovered that wet sand could be made into any shape by hand.
Generally speaking, the clean fine sand is placed in a wooden box or steel box and pressed around a preformed wood mold or real object. When the mold is removed, its contour remains on the sand, and then liquid metal is poured into the cavity. The surface of sand mold castings is very rough, so they have to clean and repair the mold, and sometimes they need to be machined, Sand mold must be remade after each casting to get other parts. Therefore, sand mold casting of many parts needs a lot of manpower and time.
Metal mold casting
The casting materials of Guangdong mechanical processing plant are selected on the basis of pouring temperature, casting size and casting recycling frequency. They determine all the heat that the metal mold can bear. Gray iron with fine grain is the most frequently used mold material. Alloy cast iron, C20 steel and alloy steel are also used in large volume and large parts, Graphite mold can be used for small volume aluminum and magnesium parts production, for high melting point alloy, such as copper and gray iron, die life will be reduced.
In the metal mold casting of Guangdong mechanical processing plant, the core is also used in the production of all parts with cavity. The core can be made of metal and sand. The process of using sand core is called semi-metal molding. The metal core should not be too complicated in side concave. In addition, the metal core should be taken out as soon as possible after solidification, otherwise it will be difficult to take out because of shrinkage. For complex shapes, the split metal core (combined core) is sometimes used in the metal mold. They are not widely used because it is difficult to effectively place the core as a separate part, and there are often size changes. Therefore, with composite cores, the designer must provide approximate tolerances on these dimensions.