Hot iron (sticking) is an independent patching entity placed on the precision casting or die, or a non-metallic material insulation body placed outside the mold shell; it can achieve heat preservation during the cooling and solidification process of the casting and make the feeding channel of the casting unblocked .
Chilled iron is a metal body placed outside the shell of precision castings; in the casting process, the metal is often placed on the sand mold, sand core surface or cavity of sand castings; chilled iron can prevent shrinkage and porosity of castings and ensure castings Quality plays a more important role.
An OEM casting made by precision casting of silica sol process, the casting requires RT2 grade, 100% PT, VT full inspection, and the material is super-wire duplex stainless steel} From the appearance of the casting, the outline size is 700mm×500 mm×470 mm , The mass is about 130 kg; plus the pouring system, the mass is about 220 kg, which is considered a larger part in the precision casting of the silica sol process. The wall thickness of the simplified casting is about 20 mm (considering the amount of processing), which is relatively uniform. The wall thickness of the cube is 27 mm. The transition between the cylinder part and the cube part forms 4 hot pitch circles with the size of ship o mm, the cube At the transition point connecting with the bottom plate, 4 hot-pitch circles with a size of ≠60 mm are formed. Solving the feeding and shrinking of 8 hot spots in the casting can obtain castings without shrinkage defects, followed by solving the casting slag porosity defects.
Because the material is super duplex stainless steel, according to the particularity of the material itself, strict control must be carried out in the chemical composition, raw materials, furnace loading, smelting, pouring, and operation process. The specific contents of the process plan are:
In the application of hot iron (sticking) and cold iron, although the defects of castings have been solved, systematic test data has not yet been formed. It is also necessary to arrange different diameters in different positions for castings of different structures in production. , Length, width and height dimensions of hot iron (stick), cold iron.
