Main reasons:
1. The sand in the cavities is not clean.
2. Before pouring the liquid metal to the mold, the riser, sprue, runner have some sand.
3. The molding sand are not sufficient enough. So the sand will be drop, which caused by the external force.
4. The casting process is not continuous or the pourcing speed is too slow, so that the sand in the cavity can not float smoothly to the riser and stay in the lower temperature.
5. The temperature is too high, the pouring speed is too fast, and the sprue or runner is rolled into some sand.
The metal casting components produced by Baoding Guokun will have less casting defects because all of our casting workers are with more than 10 years casting experience.
And before getting your sample order, our engineer will design all casting method before sample production.
If you have similar need, please contact tina@guokuncasting.com or call us 86-15168139710.
