In the die-casting industry, everyone knows that defects on the surface of die-casting parts are common, and there are many types of defects. The names of the names vary from place to place, such as flow marks and stripes. What is confusing is how the flow marks of die-casting parts are produced. Is there a solution? What is the flow mark of die casting?

The main feature of the flow mark of the die-casting part is that the surface of the casting exhibits a localized concave smooth line which is consistent with the flow direction of the molten metal. The flow mark defect has no development direction and can be removed by a polishing method.

How is the flow mark of die casting produced?

Several reasons for the analysis of flow marks:

Traces of the two strands of metal that are not synchronized with the cavity;

The mold temperature is low, such as zinc alloy mold temperature <150 ° C, aluminum alloy mold temperature <180 ° C, are prone to such defects;

Filling speed is too high;

Excessive amount of paint used.

How to eliminate the flow mark defects in die casting?

Solution:

Adjust the cross-sectional area or position of the ingate;

Adjust the mold temperature and increase the overflow tank;

Adjust the filling speed appropriately to change the flow state of the molten metal filled cavity;

The coating is thin and uniform.