The role of stainless steel precision casting in enterprise production

Simply put, it is metallurgy (melting)
1) Tapping temperature: Stainless steel is higher than carbon steel;
2) Liquidity of molten steel: stainless steel is worse than carbon steel;
3) Molten steel reducibility: stainless steel is more susceptible to air oxidation than carbon steel;
4) Solidification method: stainless steel is viscous solidification, carbon steel is sequential solidification.

For sand casting, many production factories should give full play to their expertise and choose excellent technical modeling and core-making methods. The old-style shock or shock molding machine production line has insufficient productivity, high labor efficiency and high noise, and is not suitable for many production requirements. Therefore, it should be gradually updated in many aspects. For small and medium-sized castings, the boxless high pressure molding machine production line that can be used for horizontal or vertical clinical diagnosis can be selected. The solid molding production is highly efficient and high, and it takes up a small area; for medium parts, various types of boxed molding machines can be used. The press molding machine production line and the air-punch molding line meet the requirements of the fast and high-precision molding production line. The core making methods can be: cold core box, hot core box, shell core and other high-efficiency core making methods. Medium and large batches of large castings can consider the use of epoxy resin self-setting sand for molding and core making.
Nowadays, among the precision castings produced by precision casting enterprises, about 60 to 70% of the precision castings are produced with sand molds, and about 70% of them are produced with clay sand molds. The reason that sand precision casting usually accounts for the majority is due to the low cost of gas and simple steps. Therefore, all precision castings of auto parts and accessories are classified as sand precision castings.
Bottom pressure precision casting, die casting, centrifugal precision casting and other casting methods are not easy to produce. The key is that the production cost is expensive.
For heavy-duty precision castings produced in small batches, hand-made modeling is still the key method. Hand-made modeling can be integrated into a variety of complicated requirements is more flexible, and does not require many processing technology weapons and equipment. Can use sodium silicate sand mold, vrh method sodium silicate sand mold, organic chemical ester sodium silicate self-setting sand mold, clay dry type, epoxy resin self-setting sand mold and concrete sand mold, etc.; for heavy precision castings produced from loose parts, choose bottom The pit modeling method is low-cost and quick to build and put into production. For mass-produced or long-term shaped products, multi-box modeling and split-box modeling are more suitable. Although the initial project investment of abrasive tools and sandboxes is high, it can be compensated from the aspects of saving comprehensive modeling man-hours and improving product quality.
Generally speaking, for medium, large and medium-sized precision castings, iron castings can be made of epoxy resin self-hardening sand molds,Stainless steel precision castingIt can be produced by tap water laminated glass sand molds, and castings with precise specifications and smooth surfaces can be obtained, but the cost is relatively high. Naturally, casting precision, surface smoothness, material relative density and alloy composition, physical properties and other aspects produced by sand precision casting are usually weak. Therefore, when the requirements for this characteristic of the casting are higher, other casting methods, such as melting, should be used. Mold (lost wax) casting, die casting, low pressure casting, etc.