Lost-wax casting is a precision casting technique that allows you to use a copy of a wax model to create nearly pure, complex shaped parts. Lost wax casting or investment wax is a metal forming process that typically creates a ceramic mold using a pattern of wax surrounded by a layer of ceramic. When the shell dries, the wax melts and only mold remains. The casting is then formed by injecting molten metal into a ceramic mold.
According to the different binders for making shells, investment casting can be divided into investment casting that uses a silica sol binder, investment casting that uses a water glass binder, and investment casting that uses a mixture of the two as binder.
Water glass, also known as sodium silicate, is a type of soluble alkali metal silicate that has a glassy morphology in its solid state and forms a water glass solution when dissolved in water. There are two types, potassium water glass and carbonated water glass, depending on the difference in alkali metal content. The latter is easily soluble in water, has few impurities, and exhibits stable properties. Therefore, investment casting water glass is soda water glass, which is a transparent or translucent colloidal aqueous solution formed after hydrolysis. The main chemical components of liquid glass are silicon oxide and sodium oxide. It also contains a small number of impurities. Liquid glass is not a single compound, but a mixture of several compounds.
During the investment casting process, liquid glass binders and coatings are characterized by stable performance, low cost, short shell manufacturing cycles and convenient applications. The water glass body manufacturing process is suitable to produce castings with low surface quality requirements, such as carbon steel, low-alloy steel, cast iron, copper, and aluminum alloys.
Custom Alloy Steel Cast Steel Parts Lost Wax Lost Wax Casting Process We use water glass (sodium silicate aqueous solution) as the bonding material to make the casing. The build quality of the case is a very important process in precision casting as it affects the accuracy of the final casting. Shell quality is directly related to the roughness and dimensional tolerances of the final casting. Therefore, it is an important task for investment foundries to choose the correct method to manufacture the mold body. Investment casting molds are water glass adhesive shells, silica sol adhesive shells, ethyl silicate adhesive shells, and silica sol and ethyl silicate composite shells, depending on the various adhesives or adhesives used to create the shell. of the mold. May l. These modeling techniques are the most widely used investment casting methods.