Causes of casting cracks and solutions

There are two main reasons. One is usually because the metal solidifies too fast at the place, resulting in casting defects (joints); the other is cracks caused by high temperature.

1) For the casting joints caused by the metal solidification too fast, it can be solved by controlling the casting time and solidification time. Factors related to casting time: the shape of the wax mold. The number of thicknesses cast. Casting pressure (casting machine). The permeability of the embedding material. Factors related to setting time: wax shape. The highest firing temperature of the casting ring. Type of investment material. The type of metal. The temperature of the casting.

2) Cracks caused by high temperature are related to the mechanical properties of metals and embedded materials. Cracks are prone to occur in the following situations: high casting temperature is prone to cracks; high-strength investment materials are prone to cracks; nickel alloys and cobalt alloys with low elongation are prone to cracks.

The solution:

Use low-strength investment materials; reduce the casting temperature of the metal as much as possible; do not use low ductility. Brittle alloy.