1. Is the release agent sprayed too much? Because the release agent has a large amount of air, when the amount is too much, it is not burned out before pouring, so that the volatile air is wrapped on the surface of the casting. Therefore, under the same conditions, some workers will produce more porosity during operation. Choose a release agent with a small amount of air, and the dosage is thin and uniform, and the mold is closed after burning.
The slag and venting duct are cleaned frequently.
Is the mold opening too early? Has the mold been preheated? The temperature of each part should be slowly and uniformly, so that the surface temperature of the cavity and core is 150C ~ 200C.
Is there isolation of products produced when the mold temperature is low at the beginning?
If there is no pre-heating device, whether to use aluminum alloy material, quickly push it into the cavity to preheat or use other methods to heat it?
Do you take clean aluminum liquid and inject the oxide layer into the press chamber?
When pouring, whether to put the spoon close to the injection port of the pressure chamber to avoid flying waves, oxidation or entrapment in air to cool down, etc.
As soon as the molten metal is poured into the pressure chamber, does the injection begin, and does the temperature decrease?
For cooling and mold opening, do you choose the mold opening time according to different products?
Is there any reason that I am afraid that the molten aluminum will fly out and dare not use the normal die-casting pressure? Do I dare not try to increase the specific pressure appropriately?
Does the operator strictly follow the die casting process?
12. Is there any quantitative pouring? How to determine the pouring amount?