The main features

Casting can have a slope, no parting surface, easy to operate when making small pieces; There are many shell making processes, and the quality is affected by climate and shell making operation. Casting system must be coarse or increase the support, reduce the casting process export rate; The rigidity of the shell is poor, and the casting thick and large parts are easy to deform. The residual strength of shaped shell is higher and it is difficult to clean it.