Crankshafts

Failure of journal surfaces due to oil film breakdown, micro-welding, or edge loading often traces back to improper geometry control during machining. Our crankshafts are precision-machined using five-axis CNC systems with in-process metrology to maintain taper, roundness, and cylindricity well within 3–5 μm. Strict control of oil groove placement, chamfering, and fillet radii ensures stable hydrodynamic lubrication, especially in high-speed or boundary-lubricated engine cycles. This prevents uneven wear patterns and bearing seizure. 

Thermal gradients during engine operation cause crankshaft warpage when residual stresses remain uncontrolled. We apply sub-zero treatments and staged tempering to equalize internal stresses after hardening. Post-process stress relief is verified using X-ray diffraction-based residual stress mapping. This ensures dimensional stability during operation, preserving bearing alignment and preventing deviation in rotational axis under real-world thermal cycles.