The investment casting process is more complicated and difficult to control, and the materials used and consumed are more expensive, so it is suitable for the production of small parts with complex shapes, high precision requirements, or difficult to perform other processing, such as turbine engine blades. The first process of investment casting production is to manufacture the investment mold. The investment mold is used to form the model of the cavity in the refractory shell. Therefore, to obtain castings with high dimensional accuracy and surface finish, the investment mold itself should have a high size. Precision and surface finish. In addition, the performance of the investment mold itself should be as simple as possible in the subsequent process of forming the shell.
The biggest advantage of investment casting is that because investment casting has a high dimensional accuracy and surface finish, it can reduce mechanical processing work, but only a small amount of machining allowance is required on the parts that require higher parts, even some castings only Leave the grinding and polishing allowances, and can be used without mechanical processing. The investment casting method can save a lot of machine tool equipment and processing hours, and save a lot of metal raw materials. Another advantage of the investment casting method is that it can cast complex castings of various alloys, especially high temperature alloy castings.
Silica sol precision casting usually refers to making a pattern on a fusible material, covering the surface of the pattern with several layers of refractory material to make a shell, and then melting the pattern out of the shell to obtain a mold without a parting surface, which is baked at high temperature After that, it can be filled with sand and cast. The performance of the mold-making material ensures that it is convenient to produce a mold with precise dimensions, high surface finish, good strength and light weight. The use of precision castings has been applied to hardware and the entire machinery and electronics industry. Stainless steel is not prone to corrosion, pitting, rust or wear.