Construction machinery castings are metal parts,thery are used in construction machinery, produced through a casting process (typically sand casting). These components typically serve as the structural framework or critical load-bearing components of the equipment, requiring high strength, toughness, and excellent durability. They are large and complex in structure, such as housings, axle housings, and brackets, often with irregular shapes and complex internal cavities.Ranging from tens of kilograms to several tons.High performance requirements, withstand significant shock, vibration, and alternating loads. They operate in harsh environments, often exposed to high and low temperatures, humidity, corrosion, and high wear.
Engine block and cylinder head
Transmission housing
Drive axle housing
Transmission housing
Hydraulic valve body
Pump housing and motor housing
Track shoes (used in excavators and bulldozers)
Working equipment and structural components
Boom (main arm)
Frame
Slewing bearing base
Casting Materials
High-strength cast iron (HT250, HT300, QT400-18, QT500-7, QT600-3, etc.) Gray cast iron (HT): Offers excellent casting properties and shock absorption, but lower strength and toughness.
Ductile iron (QT): Its strength, toughness, and ductility are far superior to those of gray cast iron, offering excellent overall performance and making it the most widely used material.
Gray cast iron: Suitable for housing parts with low strength requirements, such as transmission cases and clutch housings.
Ductile iron: Suitable for most key structural components, such as axle housings, wheel hubs, brackets, and drive components.
Cast steel (ZG270-500, ZG310-570, ZG42CrMo, etc.) offers the highest strength and toughness, excellent weldability, and the ability to withstand extreme impact and heavy loads. However, its casting properties are poor, and it is prone to defects such as shrinkage cavities and cracks. Core structural components such as the boom and dipper arm of large excavators, the boom of cranes, and the frame of mining trucks bear enormous loads.
Wear-resistant steel/high manganese steel (ZGMn13) rapidly hardens on the surface under intense impact and compression, becoming extremely wear-resistant while maintaining excellent toughness in the core.
Ductile iron is carbon in the form of spherical graphite. Its mechanical properties are far superior to those of gray iron and close to those of steel. It has excellent casting, cutting and wear resistance, and has a certain degree of elasticity. It is widely used in the manufacture of high-end castings such as crankshafts, gears, pistons, and various mechanical parts.
Details
Details:
Model
Material
Brand
Origin
Application
Construction machine castings
Ductile Iron QT450-10
Shengrong
China
Engine cylinder block, track plate, booms and other parts
Our factory's main casting process and technology
Resin sand casting
High dimensional and excellent surface , suitable for single-piece and small-batch production, especial for the production of large, complex castings for engineering machinery.
Lost foam casting: For particularly complex structures, it lacks parting surfaces and offers higher dimensional. However, it requires a high initial investment and is therefore suitable for large-scale production.
V-method casting (vacuum-sealed molding): Produces excellent casting surface, clean and environmentally friendly, used for the production of large, flat-plate castings.
CAE simulation analysis: Before casting, computer software used to simulate the filling and solidification processes, predicting defects such as shrinkage cavities and porosity, and optimizing the design of the gating and riser system. This is crucial for ensuring the internal quality of large, complex castings.
Heat treatment: Castings must undergo heat treatment processes such as normalizing, annealing, and quenching and tempering to eliminate casting stresses, refine the grain size, and achieve the desired mechanical properties.
Non-destructive testing: Uses ultrasonic, radiographic (X-ray, gamma-ray), and magnetic particle inspection to detect internal defects such as cracks, pores, and slag inclusions in castings.
