The Cause Of The Porosity Of Die Casting(1)

- Apr 05, 2019-

Human factors:

1. Is the release agent sprayed too much?

Due to the large amount of gas released from the mold release, when the amount is too large, it is not burned before pouring, so that the volatile gas is encased in the surface layer of the casting. Therefore, under the same conditions, some workers may produce more pores during operation. Select a mold release with a small amount of gas, the amount is thin and uniform, and the mold is closed after burning.

2 Do not clean the overflow trough and exhaust duct frequently?

3 Is it too early to open the mold?

Is the mold preheated? Does the temperature gradually increase evenly in each part, so that the surface temperature of the cavity and the core is 150 ° C ~ 200 ° C.

4 Is the product produced at the beginning of the mold temperature low isolated?

5 If there is no preheating device, do you use aluminum alloy material to slowly push the cavity into the cavity for preheating or other methods?

6 Do you take clean aluminum solution and inject the oxide layer into the pressure chamber?

7 When pouring, whether to place the spoon near the pressure chamber injection port to avoid splashing, oxidation or entrapment of air to cool down.

8 When the molten metal is poured into the pressure chamber, is it injected or not, does the temperature decrease? .

9 Cooling and mold opening, do you choose the mold opening time according to different products?

10 Do you dare to use normal die casting pressure because of the fear that the aluminum liquid will fly out (flying water)? Even less willing to try to increase the specific pressure.

11 Does the operator strictly follow the die casting process?

12 Is there a quantitative casting? How to determine the amount of pouring?