The Sand Casting Process

Apr,06,2016 << Return list

The sand casting process is a casting method in which sand is used as the main modeling material to prepare molds. sand casting has characteristics of not limited by the shape, size, complexity and alloy types of the parts. So the production cycle is short and the cost is low). Therefore, sand casting is still the most widely used casting method in casting production. Especially single-piece or small-batch castings!

The basic process of the traditional sand casting process has the following steps: sand preparation- mold making- core making, modeling-pouring-sand falling- grinding processing- inspection, etc.

Sand mixing

Preparation of molding sand and core sand. For modeling. Generally, a sand mixer is used to mix the old soil and the appropriate amount of clay.

Molding

Make molds and core boxes according to parts drawings. Generally, a single piece can be made of wood molds. And mass production can be used to make plastic molds or metal molds. (Commonly iron molds or steel molds is more). Large batches of castings can be made into stencils. Now the molds are basically engraving machines. So the production cycle is greatly shortened, and it usually takes 2-10 days to make the mold.

Core-making

Including modeling (forming the cavity of the casting with molding sand), core-making (forming the inner shape of the casting). And mold matching (putting the core into the cavity, and closing the upper and lower flasks) ). Modeling is a key link in casting.

Melting

Distribute the chemical composition according to the required metal composition. Choose a suitable melting furnace to melt alloy materials. Form a qualified liquid metal liquid (including qualified composition and qualified temperature). Electric furnaces are generally used for smelting.

Pouring

Use a ladle to pour the molten iron in the electric furnace into the finished mold. Pay attention to the speed of pouring molten iron. Let the molten iron fill the entire cavity. Besides, pouring molten iron is more dangerous, so pay attention to safety!

Pouring

Casting processing

For some castings with special requirements or some castings that cannot meet the requirements. May require simple processing. Generally, a grinding wheel or a grinder is used for processing and polishing to remove burrs. Make the castings smoother.

Casting inspection

Casting inspection is generally in the process of cleaning or processing stage. The unqualified ones are generally found out. However, some castings have individual requirements and need to be inspected again. For example, some castings require a 5 cm shaft to be inserted into the center hole, so you need to take a 5 cm shaft and try it out.

Conclusion.

After the above 8 steps, the casting is basically formed. For castings that require high precision, machining is required. With the development of casting technology, traditional sand casting is either improved or replaced by other casting methods. Constant innovation is the eternal theme. It is the inner quality and foundation that must be possessed as a casting perso

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