High-Performance Bushing for Rock Drill Jumbos This heavy-duty bushing is engineered to deliver exceptional wear resistance and load-bearing capacity in extreme mining environments. Constructed from 42CrMo4 alloy steel with induction hardening treatment, it achieves HRC50-55 surface hardness and 3-4mm hardened layer depth, ensuring 10⁶ cycles of reliable operation under high-stress conditions .
Technical Specifications & Design
Material & Heat Treatment:
42CrMo4 alloy steel (EN 10083-3) provides 1200MPa tensile strength and excellent toughness, ideal for resisting impact loads in rock drilling applications .
Induction hardening process creates a wear-resistant surface layer with HRC50-55 hardness, significantly extending service life compared to standard steel bushings .
Precision Machining:
IT6 dimensional tolerance (ISO 286-1) ensures seamless fit with mating components, reducing vibration and noise during operation.
Ra 0.8μm surface finish minimizes friction and enhances lubricant retention, critical for maintaining smooth motion in abrasive environments .
Load & Environmental Performance:
800N/mm² specific load capacity supports continuous operation under heavy radial and axial forces.
Operates reliably from -20°C to +80°C with 95% humidity resistance, suitable for both underground mines and outdoor construction sites .
Applications
Rock Drill Jumbos: Powers drill feed systems, boom articulation joints, and conveyor mechanisms.
Mining Machinery: Compatible with loaders, crushers, and tunneling equipment requiring high-wear bushings.
Industrial Equipment: Ideal for heavy-duty drives in steel mills, quarries, and construction machinery.
