Plastic Parts
Analysis and Solution on Die Casting Die Defects (I)
I. Casting has a pattern on its surface and traces of metal flow.
Causes: 1. The flow path to the entrance of the casting is too shallow.
2. The pressure ratio of the injection is too large, causing the metal flow rate to be too high, causing splashing of the molten metal.
Adjustment method: 1. Deepen the gate flow path.
2. Reduce the injection pressure.
II. There are small convex tumors on the surface of the casting.
Causes: 1. the surface is rough.
2. The inner surface of the cavity has scratches or pits and cracks.
Adjustment method: 1.polishing the cavity.
2. Replace the cavity or repair. .
III. The surface of the casting has a putt impression, and the surface is not smooth and rough.
Causes: 1. The pusher rod (top rod) is too long;
2. The surface of the cavity is rough, or there are debris.
Adjustment method:
1. Adjust the length of the pusher rod.
2. Polish the cavity to remove debris and oil.
IV. Castings have cracks or local deformation
Causes: 1. The top rod is unevenly distributed or the quantity is not enough, and the force is uneven;
2. The push rod fixing plate is deflected during work, resulting in a large force on one side and a small force on the side, causing deformation and cracking of the product.
3. The casting wall is too thin and deforms after shrinking.
Adjustment method: 1. Increase the number of ejector rods and adjust the distribution position to balance the casting force.
2. Adjust and reinstall the push rod fixing plate.
V.Die castings have pores on the surface
Causes: 1. Too much lubricant.
2. The vent hole is blocked and the vent hole is not discharged.
Adjustment method: 1. Rational use of lubricant.
2. Add and repair the venting holes to make the exhaust air unobstructed.
Continue ....
More information , please turn to https://youtu.be/Y463TzGooz4
