How to solve the problem of casting bubbles?
When there are uplifts and cavities the size of rice grains on the surface of steel castings, air bubbles will appear, so what are the causes of air bubbles? There are many reasons for air bubbles on the surface of steel castings, and air bubble defects also seriously affect cast steel. The quality of the finished product, now the editor will explain to you the reasons for the appearance of bubbles on the surface of steel castings and the corresponding solutions.
Causes of bubbles:
1. The filling of the metal liquid in the pressure chamber is too low, which will easily generate air entrainment and the injection speed will be too high;
2. The effect of mold exhaust is not ideal;
3. The manufacturer used too much release agent;
4. The opening of the ingate is not good, and the filling direction is not smooth;
5. The metal liquid is not exhausted, and the temperature during smelting is too high;
6. The temperature of the mold is too high, the time for the liquid metal to solidify is not enough, and the strength is not enough. If the steel casting manufacturer opens the mold too early to eject the casting, it will also cause the compressed gas to expand.
Ways to prevent bubbles from appearing
1. Improve the fullness of the metal liquid to prevent the occurrence of insufficient fullness;
2. Increase the setting of exhaust grooves and overflow grooves to fully exhaust the castings.
3. Adjust the smelting process and degas the metal liquid;
4. Reduce the injection speed at the initial stage, and change the switching point between low-speed and high-speed injection.
5. Reduce the temperature of the mold to prevent the mold temperature from being too high;
6. The time for mold retention is slightly extended; in order to avoid insufficient mold retention time, which will affect the casting;
7. Manufacturers minimize the use of release agents.
When producing cast steel castings, various casting defects often appear. When manufacturers face these defects, they will work with the technical department to study the causes of these defects and what to do after such defects occur. How to adjust and solve it? In the exploration of various methods, the manufacturer has formulated a set of preventive measures specifically to deal with various defects with the technical department, so that operators can learn and use them, and try to avoid problems in the casting process, or When problems arise, there are ways to deal with and adjust them, which can effectively prevent the occurrence of problems and reduce the scrap rate of products during the production process of steel castings.
