How to avoid hot cracks in casting PRG-BL?
Publish Time: 2024-10-29
In the process of casting PRG-BL, hot cracks are a common and serious problem. The generation of hot cracks often stems from the uneven solidification rate of various parts of the casting, which leads to stress concentration and eventually cracks the casting. In order to avoid this defect, a series of preventive measures need to be taken.
First, it is crucial to improve the alloy's resistance to hot cracking. Under the premise of meeting the performance of the casting, the alloy composition can be adjusted to select alloy materials with less hot cracking tendency. In addition, by controlling the solidification process, such as grain refinement, modification and vibration crystallization, the microstructure of the alloy can be further improved, thereby improving its resistance to hot cracking.
Secondly, reducing the temperature difference between various parts of the casting is also the key to preventing hot cracks. By establishing cooling conditions for simultaneous solidification and making the casting cool evenly, the generation of hot cracks can be effectively reduced. For example, opening a dispersed ingates in the thin wall of the casting, or placing chillers in the hot joints and inner corners of the casting, can help achieve this goal.
In addition, improving the structural design of the casting is equally important. The occurrence of hot nodes and stress concentration should be avoided as much as possible. By optimizing the structure of the casting, such as making the intersection of the two walls into rounded corners and avoiding the cross-intersection of the two walls, the cooling conditions and crack resistance of the high-temperature fragile parts can be significantly enhanced.
Finally, during the casting process, it is also necessary to strictly control the pouring temperature and speed, and reasonably set the pouring and riser system to reduce the thermal and mechanical obstacles during the shrinkage of the casting, thereby reducing the risk of hot cracks.
In summary, avoiding hot cracks in Casting PRG-BL requires starting from multiple aspects such as alloy selection, cooling control, structural design, and pouring operation. Only by comprehensively considering and strictly implementing these measures can the quality and production efficiency of castings be ensured.
