What is the process analysis of casting structure

Investment casting, also known as a lost wax casting, includes wax pressing, wax repairing, tree formation, paste, wax melting, casting metal liquid, and post-treatment processes. Its process to pass investment casting research institute, investment casting plant after processing in sales. The following is the technical analysis of the casting structure.

Here is the content:

The casting

Wall thickness

Sequential solidification and plane

The casting

The structure of parts should meet the requirements of machine and equipment body, machining technology, and casting technology. The structure of the casting should be reasonable. It plays an important role in ensuring casting quality, improving production efficiency, improving working conditions, and reducing casting costs. The structural design of castings is generally characterized by convenient mold lifting, reducing the number of sand cores and model blocks, convenient typing, convenient box closing, and so on. And to be conducive to the solidification of the casting, conducive to the gas and slag floating, prevent the formation of cracks, warpage. To make the casting structure simple and reasonable, easy to mold and cast. Casting rounded corners should be left at the corners of parts. Have reasonable casting wall thickness.

Wall thickness

Because the inner surface of the investment casting shell is smooth and the hot shell is usually poured, the wall thickness of the investment casting is allowed to be designed thinner. For local sharp parts, thinner wall thickness can be cast (30% - 50% less than the minimum wall thickness in the table) to prevent the defects of insufficient pouring, casting wall is not too thin, generally 2-8 mm. The wall junction to make rounded corners, casting wall thickness design to strive for uniformity, reduce hot joints. The transition between different wall thicknesses should be uniform to prevent deformation and crack of investment die and casting. This casting is designed with transition fillets.

Sequential solidification and plane

Investment casting adopts hot casting, and the distribution of investment casting should meet the requirements of sequential solidification as far as possible. The casting structure design should strive to avoid the scattered and solitary hot joint, easy to realize the sequential solidification, easy to use the straight gate for feeding, to prevent shrinkage cavity and shrinkage. There is no problem affecting the sequential solidification of the casting and the feeding can be carried out smoothly. Investment casting should avoid large planes as far as possible, because a large plane is easy to produce sand, depression, and other surface defects, so the plane on the casting should be less than 200×200 mm. The maximum plane of the casting is 24×70 mm.

Whether the casting structure is reasonable has a great influence on the casting quality, the feasibility and simplicity of the production process, and the production cost. The structure of investment castings shall conform to the production characteristics of investment casting. It is the responsibility and obligation of every investment casting plant to produce the qualified casting. Only by doing a good job in every little detail of the process can we finally make a good product.