Sand Casting Process Flow

What is sand casting

Precision sand casting, a casting method for producing castings in the sand. Steel, iron, and most non-ferrous alloy castings can be produced by the sand casting process. Because the molding materials used in sand casting are cheap and easy to obtain, and the molds are easy to manufacture, they can adapt to single-piece production, batch production, and mass production of castings. For a long time, it has been the basic process in casting production.

What is the sand casting process?

Sand casting has been used for centuries, using the most popular and simplest casting mold. Sand casting is a casting process used to make large parts such as gray cast iron, ductile iron, stainless steel, and other types of steel. The main steps include painting, mold, core making, modeling, melting and pouring, cleaning, etc.

1. Drawing of sand casting process

The traditional method is to obtain casting drawings and then send them to the foundry. This process can be completed in the quotation. Nowadays, more and more customers and foundries use computer-aided design instead.

2. Mould of sand casting process

In sand casting, the mold is made of wood or other metal materials. In this process, we require our engineers to make the mold size slightly larger than the finished product, and the difference is called the shrinkage allowance. The purpose is to ensure that the molten metal acts on the mold to ensure solidification and shrinkage of the molten metal, thereby preventing voids during the casting process.

3. Core making of sand casting process

The core is made only by placing resin sand particles in a mold to form a casting on the inner surface. Therefore, the gap between the core and the mold eventually becomes cast.

4. Forming of sand casting process

A pair of molds need to be prepared during the melting and molding process. Molding usually involves the support frame of the mold, pulling out the mold to separate it during the casting process, melting the previously placed core in the mold, and closing the mold opening.

5. Cleaning of sand casting process

The purpose of cleaning is to remove sand, sand, and excess metal in sand castings. Welding and sand removal can improve the surface appearance of castings.

The burnt sand and scale are all removed to improve the surface appearance of the casting. Excess metal and other risers are cleared. One step closer to welding and polishing. Finally, check its defects and comprehensive quality.

6. The finishing of sand casting process

Reprocessing before shipment. According to the requirements of different customers, we can do heat treatment, surface treatment, additional inspections, etc.

The above are the issues that need to be paid attention to when processing sand casting. Do you understand? Hurry up and contact us to customize the sand casting design that suits your wishes! Yifei is a professional manufacturer and supplier for custom die casting, precision investment casting, sand mold casting and custom forging in China.