What is the main function of the riser in the casting

      Many people will ask what the ingot riser is and what its the function is. Now join me to learn more about the ingot riser.

     The riser is an important part of the casting process, also known as a feeder or casting head. The riser is a reservoir built into a metal casting mold to prevent cavities due to shrinkage.

    The main function of a riser is to feed the casting during solidification so that no shrinkage cavities are formed.

 I、Feeding

The main function of the riser is to compensate for the shrinkage of the casting in the solidification process to prevent the production of defects such as shrinkage holes and shrinkage loosening. During the casting process, the liquid metal undergoes liquid shrinkage and solidification shrinkage, which can lead to the formation of holes inside the casting. As a cavity for storing liquid metal, the riser can recharge the metal when the casting solidifies.

II、Exhausting

During the casting process, the gas in the liquid metal is precipitated and rises to the top of the mold. The design of the riser facilitates the smooth discharge of these gases and prevents the gas from being trapped inside the casting to form porosity defects.

 III、Prevent liquid metal oxygenation and overheating

During the casting process, the metal liquid is susceptible to oxidation and overheating, which affects the quality of the casting. The riser can lead the metal liquid to the riser, so that the metal liquid is cooled in the riser, avoiding overheating and oxidation, thus improving the casting quality.

 The using a riser can avoid defects such as pores and shrinkage holes in castings, and prevent metal liquid oxygenation and overheating, thus improving the quality of castings. The improvement of casting quality can reduce the rejection rate of castings, reduce production costs, and is conducive to improving product quality and market competitiveness.