1. First of all, the temperature of the molten iron should be controlled. If the temperature is too low, it will simply show the defects of heavy skin, and if the temperature is too high, it will show the defects of stomata, so this is difficult to grasp, and it is necessary to strictly follow the production process.
2. Pay attention to the speed and density of the dots on the inner wall of the tube mold. If the dots are too shallow or too thin, it is necessary to ensure that the depth of the pits is suitable.
3. The orientation of the chute should be adjusted during the production process. If the chute is far away, it will show shortcomings, so to check the equipment, you must adjust the chute orientation when necessary.
