Sand casting steel investment casting refers to making a fusible model with fusible materials, coating several layers of special refractory coatings on it, drying and hardening to form an integral shell, and then using steam or hot water to form a mold. Melt out the model in the shell, then place the shell in the sand box, fill the surrounding with dry sand molding, put the mold into the roasting furnace for high temperature roasting, and pour the molten metal into the casting mold or shell after roasting And get castings.
The process is to heat various castings to a temperature of 860-900 ℃, keep the original matrix all austenitized, then cool in oil or molten salt to achieve quenching, and then heat, heat, heat and temper at 250-350 ℃, and the original matrix is converted into Tempered martensite and retained austenite structure, the original spherical graphite shape remains unchanged. Ductile castings require higher hardness as bearings, and the idler wheel assembly is often quenched and tempered at low temperature.
The treated castings have high hardness and certain toughness, Liaoning cast steel retains the lubricating properties of graphite, and the wear resistance is further improved. The products obtained by investment casting are complex, close to the shape of the parts, and can be used directly without or with little processing. It is not only suitable for casting of various types and alloys, but also produces castings with higher dimensional accuracy and surface quality than other casting methods, and even complex, high temperature resistant and difficult to process castings that are difficult to be cast by other casting methods. Can be cast by investment casting.
Post time: Feb-28-2022
