How to eliminate flow marks of the die casting parts?

Defects in die castings: #flowmarks

?Other name: stripe.

Features: the surface of the casting is in accordance with the direction of the flow of liquid metal, and the local felt and smooth lines are felt by hand. This defect has no direction and can be removed by polishing.

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Causes:

1.two strands of metal flow out of sync, filling the cavity and leaving traces.

2. mold temperature is low, such as zinc alloy mold temperature is lower than 150 degrees, aluminum alloy mold temperature below 180 degrees, are easy to produce such defects.

3. filling speed is too high.

4. too much paint.

So how to eliminate it?

Measures:

1. Adjust the sectional area or location of the gate.
2. Adjust the mold temperature, increase overflow tank.
3. Adjust the filling speed properly to change the flow pattern of the cavity filled with metal liquid.
4. The coating is thin and uniform.

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