Investment casting features

2021-09-21

Investment casting is also called lost wax casting, products are precise, complex, and close to the part final shape, it can be directly used without machining or with little machining. It is an advanced near net shape forming technology.

Compared with other casting processes, Investment casting has the following notable features:

1. The metal utilization rate is high. The metal utilization rate of Investment casting is about 3 times that of general forgings.

2. Castings have high dimensional accuracy. The dimensional accuracy can reach CT5～CT7, which can greatly reduce the machining allowance of the casting. It is enough to leave a small machining allowance for the parts with higher accuracy requirements, and even some castings only leave grinding and polishing allowances. No mechanical processing is necessary. The Investment casting can save equipment usage and processing time, and greatly save metal raw materials.

3. The mold shell is made of refractory coatings hung on wax parts, and the inner surface of the cavity directly in contact with the molten metal has a high smoothness. Therefore, the surface finish of investment castings is higher than that of general castings, generally reaching Ra.1.6~3.2μm.

4. Various alloy materials, such as carbon steel, stainless steel, alloy steel, cast iron, aluminum alloy, copper alloy, magnesium alloy, titanium alloy and many precious metals, can be used in Investment casting production .

5. It can produce castings with complex shapes. Investment casting can produce various castings that are difficult to process by other methods, such as jet engine blades. Its streamlined profile and cooling cavity are difficult to machine with mechanical processing methods. Investment casting can not only achieve mass production, ensure the consistency of castings, but also avoid stress concentration caused by residual knife marks after machining. It is also possible to integrally design and cast the parts that were originally assembled and welded by many parts, which greatly red