What are the solutions to cold isolation defects in precision casting?

The solutions to cold isolation defects in precision casting are as follows:

Increase the pouring temperature. Increasing the pouring temperature of the molten metal can increase its fluidity and reduce the occurrence of cold shut-off. However, it should be noted that the temperature cannot be too high, otherwise gas will form bubbles in the molten metal and affect the quality of the die casting.

Change the pouring method. During the pouring process, rational use of the sprue cup can effectively improve the fluidity of the molten metal and reduce the occurrence of cold shut-off.

Increase the pouring pressure. Increasing the pouring pressure during the pouring process allows the molten metal to better fill the mold, thereby reducing the occurrence of cold shut defects.

If the above preventive measures are taken, cold shut defects sometimes still occur. At this time, remedial measures need to be taken to repair the castings. Common remedial measures include increasing the number of pours, changing the pouring direction, using hot repair welding, etc.