Investment casting refers to making fusible models with fusible materials, coating them with several layers of special fire-resistant coatings, drying and hardening to form an integral shell, then melting the model from the shell with steam or hot water, and then placing the shell in a sand box, filling the dry sand around it for modeling, and then placing the mold in a baking furnace for high-temperature baking. After baking the mold or shell, A casting is obtained by pouring molten metal therein.
The products obtained by investment casting are precise and complex, close to the shape of parts, and can be directly used without or with little processing. It is an advanced process of near net shape formation, and an excellent process technology in the casting industry. It is widely used. It is not only applicable to the casting of various types and alloys, but also produces castings with higher dimensional accuracy and surface quality than other casting methods. Even the 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.
The metal materials of casting enterprises mainly come from purchased materials, waste castings and gating risers of the enterprise. The purchased metal materials are usually in bulk, rarely pressed into a cylinder, and materials of different materials are easy to be confused, such as 316 mixed with 304 or 430 materials. Therefore, precision casting enterprises should choose to purchase materials pressed into cylindrical shape as much as possible. The chemical composition of each batch of purchased materials shall be analyzed by spectral analyzer. If possible, the supplier shall conduct field investigation to evaluate whether its materials are marked, protected and stored separately.
What materials are commonly used in precision casting of Dalian castings? In precision casting, we can use stainless steel, carbon steel, alloy steel, etc., which can be used for precision casting. However, the choice should be made according to the specific circumstances.
Precision casting, which can be abbreviated as precision casting, is a special casting method. Generally speaking, the parts obtained by precision casting do not need machining, because it can obtain more accurate shape and higher casting precision. However, we can also carry out heat treatment and cold working on the product according to its needs. The types of precision casting mainly include investment casting, pressure casting, etc.
