High-Pressure Piston for Hydraulic Rock Drills This piston is engineered to generate hydraulic pressure in R32 rock drill cylinders, converting fluid energy into mechanical impact force for mining operations. Constructed from 42CrMo4 alloy steel with induction hardening, it combines high surface hardness (HRC50-55) for wear resistance with a tough core to absorb repetitive impact loads—critical for durability in abrasive environments.
Key Performance Attributes
Material & Durability:
42CrMo4 alloy steel achieves 1100MPa tensile strength, withstanding 30MPa operating pressure without deformation. The 15μm chrome plating provides 500-hour salt spray resistance (ASTM B117), protecting against corrosion in damp mines .
Induction-hardened surface (2mm depth) resists scuffing, extending service life to 800,000 cycles—25% longer than standard carbon steel pistons .
Precision & Sealing:
IT6 tolerance (ISO 286-1) ensures tight clearance (0.02-0.05mm) with cylinder walls, minimizing fluid bypass. Three piston ring grooves (compatible with ISO 6621-1 rings) maintain effective sealing even under thermal expansion .
Operational Reliability:
Designed for 1.5m/s reciprocating speed, it delivers consistent impact force in R32 hydraulic rock drills. The -30°C to +120°C operating range ensures stability in extreme temperatures, from cold tunnels to high-friction systems .
Applications
Primary Use: Hydraulic cylinders in R32 rock drills, generating impact force for rock fragmentation.
Mining Equipment: Compatible with tunneling machines, quarry drills, and exploration rigs requiring high-pressure reciprocating components.
