The wear-resistant parts of sand casting crushers are still very common in China, such as jaw plates, high chromium hammers, crushing walls, rolling mortar walls, etc., because in the crusher equipment, as a relatively large wear-resistant casting, Relatively speaking, the accuracy is not very high.
Especially for the jaws, the finished products are almost not polished by a lathe. The broken wall, rolling mortar wall, roll skin and the like only need to be polished by a lathe, so it is especially suitable for sand casting. Because the wear-resistant parts of sand casting jaws, high chromium hammers, broken walls, rolling mortar walls, roll skins, etc., these crushing equipment are more than 20% more durable than other products such as lost foam casting. However, lost foam casting has high dimensional accuracy, small machining allowance, convenient dry sand falling, and reduced cleaning and polishing workload by more than 50%, saving labor costs, so the price of lost foam casting is relatively low.
Sand casting is a kind of casting process. The casting mold used in sand casting is generally composed of an outer sand mold and a core. Because the modeling 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. At present, internationally, in the production of all castings, 60 to 70% of the castings are produced with sand molds, and about 70% of them are produced with clay sand molds.
The main reason is that compared with other casting methods, sand casting has lower cost, simple production process and short production cycle. Therefore, castings such as automobile engine cylinder blocks, cylinder heads, crankshafts, etc. are all produced by the clay green sand process. When the wet type cannot meet the requirements, consider using the clay sand surface dry sand type, dry sand type or other sand types.
The weight of castings made from clay green sand can range from a few kilograms to dozens of kilograms, while the weight of castings produced by dry clay can reach dozens of tons. Because sand casting has the above advantages, it is more and more widely used in the foundry industry. In the future, it will play an increasingly important role in the foundry industry.