What Is Cast Earth?

Gravity casting refers to the process of injecting molten metal into a mold under the action of the gravity of the earth, also known as gravity casting. In the broad sense, gravity casting includes sand casting, metal casting, investment casting, lost foam casting, mud casting, etc .; narrow gravity casting mainly refers to metal casting. ^[1]

There are many methods for making metal materials into desired products, such as casting, forging, extrusion, rolling, drawing,

Counter-gravity casting (CGC) is a casting forming process developed in the 1950s. It is the application of Pascal's principle in foundry production. As far as its process is concerned, it is a liquid forming method between pressure casting and gravity casting. The driving force of the alloy liquid filling mold is opposite to the direction of gravity, and the alloy liquid flows in the direction opposite to gravity. Compared with gravity casting, anti-gravity casting can control the melt flow during the liquid forming process, and can strengthen the solidification and shrinkage ability by the action of external force. Therefore, this process method can achieve smooth liquid filling and dense casting structure. , Casting defects can be effectively controlled, is the preferred method to produce high-quality castings.

Due to the existence of external driving force, CGC has become a controllable process. During the metal liquid filling process, by controlling the size of the external force, different filling speeds can be achieved to meet the requirements of different processes. At the same time, after the filling is completed, the external force can continue to increase, so that the casting solidifies under a large force, improves the metal liquid's shrinkage ability, and reduces casting defects such as shrinkage, pores and pinholes. In recent decades, a variety of CGC methods have appeared successively. According to the different application forms of the driving force of the metal filling mold, the CGC technology can be divided into low pressure casting, differential pressure casting, and pressure casting. ^[2]

A casting method using an electromagnetic simulation microgravity device for pouring. The metal liquid is placed in mutually perpendicular and crossed electromagnetic fields, and the electromagnetic volume force excited in the metal liquid acts on the metal liquid. The physical properties are similar to microgravity, which can eliminate the density segregation of the metal liquid and obtain uniform copper-lead and aluminum- Lead, aluminum-lithium and other alloy liquids are made into high-quality castings and bearings. ^[3]