Kobelco SK520 Bucket For Crawler Excavators

• Heavy-Duty Reliability: Designed specifically for 50-ton class lifting/excavating machines, the Kobelco SK520 Bucket boasts an ultimate load-bearing capacity sufficient to handle demanding conditions such as heavy earthmoving, rock excavation, and mining, ensuring safety and stability during high-intensity construction tasks.
• Large Capacity and High Efficiency: With a bucket volume of 3.1 cubic meters, this is a significant increase compared to traditional smaller buckets. The larger capacity means each scoop can carry more soil, rock, or minerals, reducing the number of trips and increasing work efficiency, making it suitable for large-volume excavation, loading, and earthmoving operations.
• Durable and Wear-Resistant: To withstand long-term, high-frequency, heavy-duty excavation, the Kobelco SK520 Bucket typically uses high-strength steel plates with extremely high wear resistance (such as AR series wear-resistant steel or high-strength low-alloy steel), maintaining structural integrity and service life even under abrasive, impact, and heavy-duty environments.
• High Stability and Safety: During the design and manufacturing stages, the structure is rationally designed, the welds are robust, and the manufacturing process is rigorous. It maintains good deformation control and fatigue resistance under lateral forces, impact forces, and earth pressure, thereby reducing accident risks and improving on-site safety.

Material Selection and Cutting

High-strength, wear-resistant steel plates (such as AR400/AR500 or high-strength low-alloy steel) are preferred, balancing hardness, wear resistance, and good structural strength.

CNC laser cutting, plasma cutting, or waterjet cutting are used for precise cutting of steel plates to ensure dimensional accuracy of components and reduce subsequent welding and assembly errors.

Forming and Bending/Rolling

Side plates, bottom plates, back plates, and other components are bent or rolled to conform to predetermined geometry and curvature. Cold bending or hot bending processes ensure that the steel maintains good mechanical properties during deformation.

Assembly and Structural Welding

Advanced welding processes (MIG/TIG/gas shielded welding, etc.) are used to fix components in place using fixtures or positioning devices before welding. Strict control of heat input and weld quality is maintained throughout the welding process to ensure weld strength and prevent cracking or weld fatigue.

Key load-bearing and stress-concentrated nodes (such as blades, corners, connecting lugs, and tooth base plates) are reinforced, with wear-resistant plates or thickened structures added as needed to improve impact and wear resistance.

Heat Treatment and Stress Relief

• After welding, components undergo annealing or stress-relief heat treatment to eliminate internal stresses generated during welding, reduce the risk of fatigue fracture, and enhance structural stability and service life.
• Selective hardening or surface hardening treatment may be applied to high-wear areas to balance wear resistance and overall structural toughness.
• Surface Treatment and Protective Coating
• After welding, the surface is first sandblasted or shot-blasted to remove oxide scale, weld slag, and impurities, ensuring coating adhesion and corrosion resistance.
• Apply a high-performance anti-corrosion coating (e.g., industrial primer + weather-resistant topcoat, or ceramic-based wear-resistant coating for extreme conditions) to enhance rust and wear resistance and extend service life.

Finally, install wear-resistant components such as the shovel teeth and side cutters, and perform final inspection (dimensions, welds, overall strength) and assembly.

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