Casting

Die casting is also divided into hot chamber die casting, cold chamber die casting, vacuum die casting and extrusion die casting.The main casting method is through the high pressure of molten metal into the precision mold at high speed, rapid completion of filling and solidification.

Gravity casting is a use of gravity to make the molten metal liquid slowly flow into the model, after cooling the formation of casting blanks casting method, which also belongs to a kind of die casting process.Before injecting the metal solution, the sealing of the equipment is checked.After the inspection is completed, the first steel mold will be pushed into the model inside, and the upper and lower models will be merged, and then by the workers to the liquid injection port into the molten metal solution, and then the machine slowly tilted to 90 °, so that the liquid fully inflow.After a period of resting, the model can be cooled with cooling water to accelerate the solidification of the liquid, and the casting blank is finally removed.

Lost foam casting is a method of producing cast blanks using expanded polystyrene as a mold. The molten metal solution is injected into the model, forming the casting shape of the foam mold and melting the mold.This method can realize complex casting shapes, but has the disadvantage that it tends to cause air bubbles on the surface of the casting blank, which affects the casting results.

Sand casting is a method of making upper and lower double-layer molds with sand and pouring molten metal solution into the upper mold, which is slowly injected into the mold through pipes designed to form the final casting.This casting method is characterized by the use of molds made of sand, clay, water and other additives, and the molds are divided into two parts, the upper mold will be pre-designed with a gate pipe to facilitate the inflow of molten metal solution, while the lower mold does not have this gate system.When combining the upper and lower molds, it is necessary to lay a layer of sand between the two molds to facilitate the subsequent separation and removal of the casting parts.

Investment Casting, also known as Lost Wax Casting, is characterized by the production of a wax version of the final product prior to casting.This wax version can be made in three ways: 1. by carving or machining a replica of the product into a block of wax; 2. by machining a metal mold of the final product and filling it with hot wax; and 3. by using 3D printing to create a model of the final product and wrapping it in gelatin to form a gelatin mold.After the wax mold version is made, it is necessary to set up the wax channels and sprues, and repeatedly immerse the whole body in ceramic slurry, and then carry out the dewaxing operation (removing the wax mold by means of heating) after the ceramic slurry dries out and hardens, and ultimately form a ceramic empty mold with a pouring system.Molten metal is poured into the empty mold and the casting is removed by breaking the ceramic mold after solidification.This is a tedious casting process, but the surface quality of the cast product is high and it is a fine casting.