Selection of stainless steel precision casting

1. Sand casting is preferred. According to statistics, in my country or internationally, 60 to 70% of all castings are produced with sand molds, and about 70% of them are produced with clay sand molds. The main reason is that sand investment casting china has lower cost than other casting methods, simple production process, and short production cycle. Therefore, castings such as automobile engine cylinder blocks, cylinder heads, and crankshafts are all produced by the clay green sand process. When the wet type cannot meet the requirements, consider using clay sand surface dry sand type, dry sand type or other sand types. The weight of castings made from clay green sand can range from several kilograms to dozens of kilograms. Generally speaking, for medium and large castings, iron castings can be produced with resin self-hardening sand moulds, and steel castings can be produced with hydroglass sand moulds. Castings with accurate dimensions and smooth surface can be obtained, but the cost is higher. Of course, the investment casting china precision, surface finish, material density and metallographic structure, mechanical properties, etc. produced by sand casting are often poor. Therefore, when these castings require higher performance, other casting methods, such as investment (lost Wax) casting, die casting, low pressure casting, etc.

2. Low pressure casting, die casting, centrifugal casting and other casting methods are suitable for mass production due to the high prices of equipment and molds. For small castings, a boxless high-pressure moulding machine production line with horizontal or vertical parting can be used. The production efficiency of solid moulding is high and the floor space is small. For middle parts, various boxed high-pressure moulding machine production lines and gas can be used. Molding line to meet the requirements of fast and high-precision molding production line. Core making methods can be selected: cold core box, hot core box, shell core and other core making methods. Medium-volume large castings can consider the application of resin self-setting sand molding and core making.　 For single-piece and small-batch production of heavy investment casting china, manual modeling is still an important method. Manual modeling can adapt to various complex requirements and is more flexible, and does not require a lot of process equipment. Water glass sand molds, VRH water glass sand molds, ester water glass self-hardening sand molds, clay dry molds, resin self-hardening sand molds, cement sand molds, etc. can be used; for single-piece heavy castings, the pit molding method is used for low cost and fast production . Mass production or long-term production of shaped products are more suitable to adopt multi-box modeling and split-box modeling. Although molds, sand boxes, etc. start to invest high, compensation can be obtained from saving modeling man-hours and improving product quality.