Casting process

Casting generally does not apply pressure, has low requirements for the strength of equipment and molds, has small limitations on product size, and has low internal stress in the product. Therefore, the production investment is relatively small, and high-quality large parts can be produced, but the production cycle is long and mechanical processing is required after forming. On the basis of traditional casting, methods such as pouring, embedding casting, pressure casting, rotary casting, and centrifugal casting have been derived.

① Perfusion. The difference between this method and casting is that after casting, the product comes out of the mold; When pouring, the mold is actually a component of the product itself.

② Embedded casting. Place various non plastic parts in the mold cavity and solidify them with the injected liquid material to encapsulate them.

③ Pressure casting. Applying a certain amount of pressure to the material during casting is beneficial for injecting viscous materials into the mold and shortening the filling time, mainly used for epoxy resin casting.

④ Rotary casting. After injecting the material into the mold, the mold rotates around a single or multiple axis at a lower speed, and the material is distributed on the inner wall of the mold cavity by gravity, and is shaped through heating and solidification. Used to manufacture hollow products such as spherical and tubular shapes.

⑤ Centrifugal casting. Inject a quantitative amount of liquid material into a mold that rotates around a single axis at high speed and can be heated. Use centrifugal force to distribute the material onto the inner wall of the mold cavity, and solidify it into tubular or hollow cylindrical products through physical or chemical reactions (see Figure [Centrifugal Casting]). Monomer cast nylon parts can also be formed by centrifugal casting method.