SAND CASTING EQUIPMENT.

Casting temperature is too high will greatly increase the proportion of scrap, can cause the sand mold up, especially with complex sand core of gray cast iron parts, when the casting temperature ≥ 1420 ℃ scrap increase, casting temperature of 1460 ℃ scrap up to 50% production, xinyuanzhu group by using induction furnace melting better control of the temperature of the molten iron.
The defects that may be formed when the casting temperature is too low:

1.Manganese sulfide pores
This kind of pore is located below and mostly above the skin of gray cast iron parts, often revealed after processing, the diameter of the pore is about 2~6mm sometimes the hole contains a small amount of slag, xinyuanzhu group research shows that this defect is made of MnS segregation and slag mixing, the reason is the low casting temperature, while the high amount of Mn and S in the molten iron. The appropriate amount of S and the appropriate amount of Mn (0.5%-0.65% can significantly improve the purity of the molten iron, thus effectively preventing such defects.

2.sand core gas caused by porosity
Porosity and porosity are often caused by poor exhaust of the sand core. Because the core is made when the sand core more in the core box hardening, which often makes the sand core exhaust hole number is not enough. In order to form air venting holes, the core can be supplemented with holes after hardening.

3.Liquid slag entrapment
After processing, a single small hole will be found under the epidermis of gray cast iron parts, the diameter of the hole is generally 1~3mm individual cases only 1-2 small holes. xinyuanzhu Group research shows that these small holes with a small amount of liquid entrapment slag, but the place is not found S deviation. xinyuanzhu Group research indicates that this defect is related to the casting temperature, the casting temperature is higher than When the casting temperature is higher than 1380℃, this defect is not found in the casting, so the casting temperature should be controlled at 1380-1420℃. xinyuanzhu group failed to eliminate this defect by changing the design of the casting system before, so this defect can be considered to be formed due to the low casting temperature and the iron liquid in the trace reducing atmosphere when casting.
The most common reason for low pouring temperature is heat dissipation due to long transport and stay of the molten iron in the open pouring ladle before pouring. Using a pouring ladle cover with insulation material can significantly reduce the heat loss.

Xinyuanzhu Group specializes in the production of Ductile iron castings, Pig iron gray iron casting, Steel casting, Brass Casting, Malleable Iron Casting, and undertakes batch casting processing of castings. Welcome guests to cooperate with pictures or samples.