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Crankshaft is the core component of engine, its manufacturing process is complex, requiring high precision and high strength. The following is the primary process flow of the crankshaft:
1. Material selection
Commonly used materials: forged steel, ductile iron, alloy steel, etc.
Material requirements: high strength, wear resistance, fatigue resistance.
2. Forging or casting
Forging process:
Heat billets to forging temperature (approx. 1200°C).
Use the forging press to form the crankshaft shape initially.
Advantages: dense tissue, high strength.
Casting process:
Suitable for nodular cast iron crankshaft.
Molded by mold pouring.
Advantages: Low cost, suitable for complex shapes.
3. Heat treatment
Normalizing or annealing: eliminate internal stress and improve processing performance.
Quenching and tempering: increase hardness and strength, enhance wear resistance.
4. Roughing
Turning: Machining the outer circle of the spindle journal and connecting rod journal.
Milling: machining both ends and keyways of the crankshaft.
Drilling: processing lubricating oil holes.
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