Simply put, 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 oxidation: stainless steel is easier to oxidize than carbon steel;

4) Solidification method: stainless steel is solidified in paste form, and carbon steel is solidified sequentially.

Sand casting,Guangdong Stainless Steel CastingMass production factories should create conditions to adopt technologically advanced modeling and core-making methods. The old-fashioned shock-type or shock-type molding machine production line is not high enough in productivity, the labor intensity of the workers is large, the noise is large, and it is not suitable for the requirements of mass production, so it should be gradually reformed. 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 area 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, high-precision molding production line, core-making methods can be selected: cold core box, hot core box, shell core and other high-efficiency core-making methods. Medium-volume large castings can consider the application of resin self-setting sand molding and core making.

nowDongguan Precision CastingAmong the precision castings produced by the company, 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 why sand precision casting accounts for the majority is because of the low gas cost and simple process. Therefore, I think that auto parts precision castings, etc. are all made of sand precision castings.

Low-pressure precision casting, die-casting, centrifugal precision casting and other casting methods are not easy to mass-produce, mainly because the production cost is expensive.

For heavy-duty precision castings produced in small batches, 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. It can be applied to sodium silicate sand mold, vrh method sodium silicate sand mold, organic ester sodium silicate self-setting sand mold, clay dry type, resin self-setting sand mold and cement sand mold, etc.; for single-piece production of heavy precision castings, the pit molding method is used for low cost. Put into production quickly. Mass production or long-term production of shaped products adopt multi-box modeling and split-box modeling. Although the initial investment in molds and sand boxes is high, it can be compensated by saving modeling man-hours and improving product quality.

Generally speaking, for medium and large precision castings, iron castings can be made of resin self-hardening sand molds,Dongguan Precision CastingThe parts can be produced by using water glass sand molds, and castings with precise dimensions and smooth surfaces can be obtained, but the cost is relatively high. Of course, the precision, surface finish, material density, metallographic structure, and mechanical properties of castings produced by sand precision casting are often poor. Therefore, when these castings require higher performance, other casting methods should be used, such as investment ( Lost wax) casting, die casting, low pressure casting, etc.