Investment casting is also called lost wax casting, including waxing, waxing, grouping, dipping, melting wax, casting molten metal and post-treatment. Lost wax casting is a wax mold in which a part is to be cast with wax, and then the wax mold is coated with mud, which is a mud mold. After the mud mold is dried, the internal wax mold is melted by placing it in hot water. The mud mold from which the wax mold has been melted is taken out and baked into a ceramic mold. Once roasted. In the general clay mold, the pouring port is left, and the molten metal is poured from the pouring port. After cooling, the required parts are prepared.
When casting with a wax, the investment casting is also called "lost wax casting". Investment casting usually refers to forming a pattern in a fusible material, coating a plurality of layers of refractory material on the surface of the pattern to form a shell, and then melting the pattern to discharge the shell, thereby obtaining a mold having no parting surface, and after being baked at a high temperature A casting scheme that can be filled with sand. Investment molding is often referred to as "lost wax casting" because the pattern is widely manufactured using waxy materials.
The alloys that can be produced by investment casting are carbon steel, alloy steel, heat resistant alloy, stainless steel, precision alloy, permanent magnet alloy, bearing alloy, copper alloy, aluminum alloy, titanium alloy and ductile iron.
The shape of the investment casting is generally complicated, the minimum diameter of the castable hole on the casting can be up to 0.5 mm, and the minimum wall thickness of the casting is 0.3 mm. In the production, some parts that were originally composed of several parts can be directly cast by investment casting by changing the structure of the parts and designed as integral parts, so as to save processing time and metal material consumption, and make the part structure more. To be reasonable.
The weight of investment castings is mostly tens of cattle (from a few grams to a dozen kilograms, generally not more than 25 kilograms), and castings that are too heavy are more troublesome to produce by investment casting.
The investment casting process is complicated, difficult to control, and expensive to use and consume. Therefore, it is suitable for producing small parts with complicated shapes, high precision requirements, or difficult to perform other processing, such as blades of turbine engines.
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