Casting is a kind of metal hot working technology which has a history of about 6000 years. China has entered the heyday of bronze casting between 1700 BC and 1000 BC, and its technology has reached a very high level. Casting refers to the process of melting solid metal into liquid state and pouring it into the mold of specific shape for solidification. Casting materials: ordinary casting materials, such as aluminum, aluminum, clay, and other auxiliary materials, such as aluminum, aluminum, water. The special casting mold includes: investment casting, lost foam casting, metal mold casting, ceramic mold casting and so on. (raw sand includes quartz sand, magnesia, zirconium sand, chromite sand, forsterite sand, kyanite sand, graphite sand, iron sand, etc.) more and more friends begin to enter the foundry industry. For casting, according to the information and knowledge, combined with their own field investigation and practice, the classification method of casting is obtained.
Generally, it is divided according to the modeling method, and the attention is the modeling method. At this time, there are ordinary sand casting, special casting, two categories. The main difference between them lies in their different shapes.
Ordinary sand mold casting, also known as sand casting, foundry, according to the different humidity of sand mold, can be divided into three types: wet sand mold, dry sand mold and chemical hardening sand mold. In fact, these three types of sand mold have the same goal by different ways. The principle adopted is almost the same, but there is a slight difference in the adjustment of sand mold in the later stage. Therefore, we should understand that sand mold is the key to distinguish the three.
The special casting can be divided into natural mineral sand and stone as the main materials (such as investment casting, clay casting, shell casting, negative pressure casting, full mold casting, ceramic casting, lost foam casting, etc.), and the investment, clay mold, shell mold, etc. in brackets are the specific physical modeling forms of casting. There is also a kind of special casting with metal as the main material (such as metal mold casting, pressure casting, continuous casting, low pressure casting, centrifugal casting, etc.). At this time, the mentioned metals, pressure casting, continuous casting and so on are all classified according to the nature of their special casting.