1、The surface of the zinc alloy die casting has a pattern and a trace of metal flow

Reason：

1、The runner to the inlet of the casting is too shallow

2、If the specific pressure of the injection is too large, the metal flow rate will be high that causes the splashing of the molten metal.

Measure：

1、Deepen the gate runner.

2、Reduced specific pressure of injection.

2、There are small bulges on the surface of zinc alloy die castings

Reason：

1、Rough surface.

2、There are scratches, pits, and cracks on the inner surface of the cavity.

Measure：

1、Polished cavities.

2、Cavity replacement or patching.

3、There are push rod marks on the surface of the casting, and the surface is not smooth and rough

Reason：

1、The push rod (ejector rod) is too long.

2、The surface of the cavity is rough, or there are debris.

Measure：

1、Adjust the length of the pusher rod.

2、Polishing the cavity to remove debris and oil.

4、There are cracks or local deformation on the surface of zinc alloy die castings

Reason：

1、Uneven distribution or insufficient number of ejector rods, uneven force.

2、The fixed plate of the pusher rod is deflected during work, resulting in a large force on one side and a small force on the other side, which deforms the product and produces cracks.

3、The walls of the casting are too thin and deformed after shrinking.

Measure：

1、Increase the number of ejector rods and adjust their distribution positions to make the ejection force of the casting equal.

2、Adjust and reinstall the pushrod retaining plate.　

5、There are pores on the surface of zinc alloy die castings

Reason：

1、Too much lubricant.

2、The exhaust hole is blocked, and the air hole cannot be discharged.

Measure：

1、Use lubricants wisely.

2、Addition and repair of exhaust holes to make their exhaust unobstructed.　

6、There are shrinkage porosity on the surface of the casting　

Reason：The manufacturability of castings is unreasonable, and the wall thickness changes too much. The molten metal temperature is too high.

Measure：

1、In the place of wall thickness, increase the process hole to make it thin and uniform.

2、Lower the temperature of the molten metal.　

7、The outer contour of the casting is not clear, it cannot be formed, and the material is partially underserved

Reason：

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

2、The thickness of the feed port is too large.

3、The gate is incorrectly positioned, causing a frontal impact on the metal.

Measure：

1、Replace the die-casting machine with a larger die-casting ratio.

2、Reduce the thickness of the inlet runner

3、Change the gate position to prevent a frontal impact on the casting.

8、The casting part is not formed, and the cavity is not filled

Reason：

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

2、Low molten metal temperature.

3、The press pressure is too small.

4、The molten metal is insufficient, and the injection speed is too high.

5、The air can't be discharged.

Measure：

1、Increase the temperature of die casting mold and molten metal.

2、Replace the high-pressure die casting machine.

3、Add enough molten metal to reduce the injection speed and increase the thickness of the inlet.　

9、The filling of the acute angle of the die casting is not satisfied

Reason：

1、The inner gate inlet is too large.

2、The pressure of the die-casting machine is too small.

3、Ventilation at acute angles is not good, and air cannot be discharged.

Measure：

1、Reduce the inner gate.

2、Replace the high-pressure die casting machine.

3、Improve the exhaust system.

10、The casting structure is loose and the strength is not high

Reason：

1、The pressure of the die casting machine is not enough.

2、The inner gate is too small.

3、The vent hole is blocked.

Measure：

1、Change the press.

2、Enlarge the inner gate.

3、Check the vents and give trimming ventilation.

11、There are pores in the casting

Reason：

1、The flow direction of the molten metal is incorrect, and the cavity of the die casting has a frontal impact, resulting in a vortex that surrounds the air and produces bubbles.

2、The inner gate is too small and the molten metal flow rate is too large, blocking the vent hole too early before the air is discharged, allowing the gas to remain in the casting.

3、The cavity of the moving model is too deep, and it is difficult to ventilate and exhaust.

4、The exhaust system is not properly designed, and the exhaust is difficult.

Measure：

1、Corrected the diverter cone to be too small and shaped to prevent a frontal impact on the cavity with the metal flow.

2、Enlarge the inner gate appropriately.

3、Improve mold design.

4、Reasonable design of exhaust holes and increase air pockets.

12、There is impurities in castings

Reason：

1、The molten metal is not clean and has impurities.

2、The alloy composition is not pure.

3、The mold cavity is not clean.

Measure：

1、Pour in and remove impurities and slag.

2、Replace the alloy.

3、Clean the mold cavity to make it clean.

13、 Molten metal is splashed out during the die-casting process,

Reason：

1、The sealing between the moving and fixed molds is not tight, and the gap is large.

2、The clamping force is sufficient.

3、The pressure maneuver and the fixed plate are not parallel.

Measure：

1、Reinstall the mold.

2、Increase the clamping force.

3、Adjust the die-casting machine so that the moving and fixed molds are parallel to each other.