Crankshaft
The crankshaft is a core transmission component in power equipment such as engines, motors, and compressors, and requires stringent standards for machining accuracy, strength stability, and dynamic balance performance.
| Core Machining Indicators | Precision Parameters | Technical Value |
| Dimensional Accuracy | Main journal diameter tolerance ±0.001 mm Connecting rod journal roundness ≤0.0005 mm Journal step concentricity ≤0.002 mm | Ensures precise fit with bearings and connecting rods, reducing operational clearance and wear |
| Surface Quality | Journal surface roughness Ra 0.05 μm Fillet transition R0.5–2 mm (burr-free) | Reduces stress concentration, improves fatigue strength, and extends crankshaft service life |
| Material Adaptation | 42CrMo quenched & tempered steel / Ductile iron QT700 / Aerospace-grade titanium alloy | Meets the needs of different power equipment, balancing high strength, lightweight design and corrosion resistance |
| Dynamic Balance Performance | Dynamic balance grade G1.0 (rotational speed ≤8000 r/min) Unbalance ≤0.5 g·mm | Avoids vibration during high-speed rotation, reducing equipment noise and energy consumption |
| Machining Process | 5-axis CNC turning-milling compound machining, one-time clamping forming Main journal high-frequency quenching (hardness HRC 58–62) | Reduces clamping errors, enhances journal wear resistance, and adapts to long-term high-load operation |
Quality Inspection Standards and Compliance Requirements
- Dimensional Inspection: Use Coordinate Measuring Machine (CMM) for 100% inspection of key dimensions, with detection accuracy up to 0.0001 mm to ensure parameters meet standards
- Defect Detection: Through magnetic particle inspection or penetration testing, check for internal cracks, pores and other defects to prevent unqualified products from flowing downstream
- Batch Control: 100% inspection of first article, 3 pieces sampled for inspection every 50 pieces in batch production, defect rate controlled below 0.1%, qualification rate ≥99.9%
- Compliance Certification: Compliant with ISO 9001 quality management system, aero-grade crankshafts can provide AS9100 certification-related test reports
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