Solving Casting Surface Defects

The surface of a die casting suffered from peeling or had two-tone discolorations. Sometimes a second buffing was required to eliminate these surface problems.

Simulation indicated that the die was being overheated to more than 450° C in several locations. This led to soldering of the part to the die, which was the reason for the surface defects. Based on these results different measures were taken. In particular the designers were encouraged to revise their design by increasing the wall thickness in the critical location by 0.5 - 0.65 mm.

The photo left shows casting surface defects on the casting due to die soldering. Die temperatures in simulation (right) show that the surface temperatures are too high.