Features of carbon steel precision casting process: 1. Since the shrinkage rate of carbon steel precision castings greatly exceeds that of cast iron, in order to prevent the shrinkage and shrinkage defects of the castings, most casting processes use risers, cold iron, and subsidies to achieve in order solidification. 2. Due to the poor fluidity of molten steel, in order to prevent cold separation and pouring of steel castings, the wall thickness of steel castings should not be less than 8 mm; dry casting or hot casting. Properly increase the pouring temperature, generally 1520°~1600°C. Due to the high pouring temperature, the molten steel has a high degree of superheat, which can keep the liquid for a long time and improve fluidity.
Carbon steel investment casting is called investment casting investment casting or precision casting. This is a casting process with few or no cuts. It is a process technology in the foundry industry. So what should I pay attention to is carbon steel investment casting?
1. In order to prevent the whitening of carbon steel precision casting, in addition to the measures taken in the process, the wall thickness should not be too thin (some data point out that when the wall thickness is above 15mm, the metal type of the corners of the casting must be rounded corners
2. Since The metal type and core are incompatible, the casting spacing of carbon steel precision castings should be larger than that of sand castings, especially for castings that should be 30%-50% larger for easy removal
3. The thickness of the inner wall and inner rib of carbon steel precision castings Generally, it should be 0.6-0.7 of the thickness of the connecting outer wall. Otherwise, the inner wall (rib) will be cold, and when the casting shrinks, cracks will appear at the intersection of the inner and outer walls.
4. Due to the rapid heat dissipation of the metal type, the wall thickness of the stainless steel casting should be Greater than the thickness of sand, riveted casting, and wall thickness of various casting alloys and castings of different sizes.