Casting is a kind of metal hot working technology that human beings mastered earlier, and it has a history of about 6000 years. China entered the heyday of bronze casting from about 1700 BC to 1000 BC, and its technology reached a fairly high level.
Casting is a method that liquid metal is poured into the casting cavity suitable for the shape of the part, and after cooling and solidification, the part or blank can be obtained The materials to be cast are mostly metals (such as copper, iron, aluminum, tin, lead, etc. ) is solid but heated into liquid, and the material of the mold can be sand, metal or even ceramics. According to different requirements, the methods adopted will be different.
Casting is a kind of metal hot working technology that human beings mastered earlier, and it has a history of about 6000 years. China entered the heyday of bronze casting from about 1700 BC to 1000 BC, and its technology reached a fairly high level. Casting refers to the processing method of melting solid metal into liquid and pouring it into a mold with a specific shape, waiting for its solidification.
Metals to be cast are: copper, iron, aluminum, tin, lead, etc. The materials of ordinary molds include raw sand, clay, water glass, resin and other auxiliary materials. Special casting molds include: investment casting, lost foam casting, metal mold casting, ceramic mold casting, etc. (Raw sand includes quartz sand, magnesia, zircon sand, chromite sand, forsterite sand, kyanite sand, graphite sand, iron sand, etc. ).
The casting process usually includes
① Prepare a mold (a container for making liquid metal into solid castings). According to the materials used, molds can be divided into sand mold, metal mold, ceramic mold, clay mold, graphite mold and so on. According to the times of use, it can be divided into disposable molds, semi-permanent molds and permanent molds. The quality of mold preparation is the main factor affecting the quality of castings.
(2) Melting and pouring of casting metal. Casting metals (casting alloys) mainly include all kinds of cast iron, cast steel and cast nonferrous metals and alloys.
(3) Casting processing and inspection. Casting treatment includes removing foreign bodies from the core and the surface of the casting, cutting off the riser, shoveling off burrs, overlapping seams and other protrusions, as well as heat treatment, shaping, rust prevention and rough machining.