Sand casting

2024-01-31 10:17:14

Among the total casting production, 60-70% of the castings are produced using sand molds, and about 70% of them are produced using clay sand molds. The main reason is that sand casting has lower costs, simpler production processes, and shorter production cycles compared to other casting methods. So castings such as engine cylinder blocks, cylinder heads, and crankshafts in cars are all produced using clay green sand technology. When the wet type cannot meet the requirements, consider using clay sand surface dry sand type, dry sand type, or other sand types. The weight of castings cast with clay green sand can range from a few kilograms to tens of kilograms, while castings produced with clay dry mold can weigh tens of tons.

Generally speaking, for medium and large castings, cast iron can be produced using resin self hardening sand molds, while steel castings can be produced using water glass sand molds to obtain castings with precise dimensions and smooth surfaces, but the cost is relatively high.

Of course, the precision, surface smoothness, material density, metallographic structure, mechanical properties, and other aspects of castings produced by sand casting are often poor. Therefore, when these performance requirements of castings are higher, other casting methods should be used, such as investment casting (wax loss) casting, die casting, low-pressure casting, and so on.