Die-casting is particularly suitable for the manufacture of a large number of small and medium-sized castings, so die-casting is a widely used type in various casting processes. Compared to other casting techniques, the die-cast surface is flatter and has a higher dimensional consistency.
1. There are flow marks and patterns on the surface of aluminum alloy die-casting parts.
There are streaks on the surface of the casting that are consistent with the flow direction of the molten metal. There is a visible non-directional texture that is different from the color of the metal substrate, and there is no development trend.
2, aluminum alloy die casting cracked
On the surface of the aluminum alloy die-casting part, there are traces of protrusions or depressions like the net hair, which are continuously enlarged and extended as the number of times of die casting increases.
3, cold insulation
The surface of the aluminum alloy die-casting part has obvious, irregular, and depressed linear shape. The shape of the line is small and narrow, and sometimes the intersection edge is smooth, and there is a possibility of disconnection under the action of external force.
4, aluminum alloy die castings have dents on the surface
There are smooth indentations on the surface of the majority of the thickness of the die casting.
5, surface traces
Traces left by contact between the surface of the aluminum alloy die-casting part and the cavity surface of the die-casting mold or step marks on the surface of the casting.
6, aluminum alloy die-casting parts have adhesion marks
The small piece and the metal or non-metal are welded to the base portion of the metal, and the small piece is peeled off by the external force, and the surface of the cast after peeling is bright and some are dark gray.
7, aluminum alloy die casting has cracks
The aluminum alloy die-casting part is placed in an alkaline solution, and the crack is dark gray. The destruction and cracking of the metal matrix are linear or wavy, and the grain is narrow and long, which has a tendency to develop under the action of external force.