Plastic Parts

Analysis and Solution on Die Casting Die Defects (II)

VI Castings have shrinkage holes on the surface

 the cause: 1. the die-casting process is unreasonable, and the wall thickness changes too much.
            2.The temperature of the molten metal is too high.

Adjustment method:

1. In the wall thickness, increase the process hole to make it thin and even.

2. Reduce the temperature of the molten metal.

VII Seven The outer contour of the casting is not clear, it can not be shaped, and the local material is not material.

 The reasons are as follows:

 1. The pressure of the die casting machine is not enough, and the pressure is too low.

 2. the thickness of the feed port is too large;
 3. the gate position is not correct, so that the metal has a frontal impact.

Adjustment method:

1. Replace the die-casting machine with larger compression ratio than the pressure;

2. Reduce the thickness of the feed channel; 3. Change the gate position to prevent the front impact on the casting.

VIII The parts of the eight castings are not formed, and the cavity is not full.

The causes are:

1. The temperature of the die-casting mold is too low;

2.The temperature of the molten metal is low;

 3. The pressure of the press is too small,

4. The molten metal is insufficient, and the injection speed is too high; The air can't be discharged.

Adjustment method:

1. improve the die-casting mold, metal liquid temperature;

2. replace the large pressure die-casting machine.

3. Add enough metal liquid to reduce the injection speed and increase the thickness of the feed port.

VIIII Die castings are not filled at the sharp angle.

Causes: 1.the inlet of the ingate is too large;

  2.the pressure of the die casting machine is too small;

 3. the ventilation at the acute angle is not good, there is no air discharge.

Adjustment method:

1.Reduce the ingate.

2.Change the pressure casting machine with high pressure.
3.Improve the exhaust system