Manual modeling is still an important method for single piece small batch production of heavy castings. Manual modeling can adapt to various complex requirements and is flexible, and does not require a lot of process equipment. Can be used in sodium silicate sand, VRH method sodium silicate sand, organic ester sodium silicate self-hardening sand, clay dry, resin self-hardening sand and cement sand, etc.. In most cases, the stainless steel ring forging factory always have a lot of different processed products, first of all, will be made, stainless steel products, such as medical, after removing the corresponding heat treatment, Mosaic full circle or under the condition of equal size, to the construction site will be on complete different flange and pressure on the arc compound with container. The above is to ensure high precision ring forging method.