Structural Characteristics Of Construction Machinery Castings

The structural characteristics of construction machinery castings are mainly reflected in aspects such as complexity, load-bearing capacity, process adaptability, and defect control requirements.

Typical Structural Features
Box/frame type dominant: Such as crawler frames, chassis, booms, and dipper arms, which mostly use box-shaped or rib-reinforced structures to enhance rigidity and torsional resistance.

Combination of thick and thin walls: Key load-bearing parts (such as bearing seats and connecting ears) have thicker walls, which are prone to shrinkage cavities; non-load-bearing areas are often designed with thin walls to reduce weight.

Complex internal cavities and ribs: To meet functional requirements (such as wiring and oil channels), internal ribs and holes are often added, which increases casting difficulty and the risk of porosity.

Widespread use of rounded corners: Large fillets (usually R3–5mm) are used at corners to avoid stress concentration and cracks.