In the production process of die-casting parts, many quality problems will be encountered, that is, as a common quality defect of die-casting parts, under-casting is one of the defects, then Power Tools Die Casting Part Supplier will tell you that the die-casting parts have under-casting What are the reasons for:
1. Poor filling conditions, irregular condensed metal in the undercast part;
\u2460 When the pressure is insufficient, insufficient, and the metal at the front of the activity solidifies prematurely, under-casting occurs in corners, deep recesses, thin walls (even thinner than the average wall thickness), and cylindrical hole walls.
\u2461The mold temperature is too low;
\u2462The alloy pouring temperature is too low;
\u2463The position of the inner gate is not good, forming a large resistance to movement.
2. The gas is obstructed, the surface of the undercast part is lubricated, but the shape is irregular
\u2460It is difficult to set up the part of the overflow system, and the gas accumulates;
\u2461 When the molten metal is in motion, the turbulence is intense and envelops the gas.
3. There are residues in the plastic mold cavity
\u2460 Improper amount of paint or spraying method may cause local paint deposition.
\u2461The inlay gap of the molded part is too large, or the sliding cooperation gap is too large, and the metal enters during the filling, and after the casting is released, it cannot be completely taken out and appears to be sandwiched in the gap.
\u2462Insufficient casting material (including too thin remaining material joints).
\u2463On the vertical die-casting machine, when injecting, the lower punch moves down so that the opening of the nozzle is not enough, resulting in a series of poor filling conditions.
Through the above introduction, Power Generating Tools Factory hopes that you can simply refer to the content of this article in future use.
