 |
Product Description
In the brutal environment of a mine site, equipment failure means costly downtime. The eccentric crankshaft within an excavator's drive system is a component subjected to immense, cyclical stress. Yile Machinery manufactures forged and precision-ground eccentric shafts specifically engineered to withstand these extreme conditions, offering a level of reliability and durability that surpasses standard or repaired parts.
Creating a shaft that can endure the punishing forces of a mining excavator requires a process focused on metallurgical integrity and absolute precision.
We do not machine from simple bar stock. Every eccentric shaft begins as a solid billet of high-grade alloy steel, such as 42CrMo (AISI 4140) , which is then forged to its near-net shape. This forging process is critical:
It aligns the steel's internal grain structure to the contours of the shaft, dramatically increasing its strength and resistance to fatigue cracking.
It eliminates the internal porosity and defects that can lead to catastrophic failure under load.
An eccentric shaft needs two different mechanical properties: a tough core to absorb shock and hard surfaces to resist wear. We achieve this through a multi-stage heat treatment process:
Quenching & Tempering: The entire forged shaft is heat-treated to develop a strong, tough, and ductile core that can handle high torque and bending forces without fracturing.
Induction Hardening: The critical bearing journals and eccentric lobes are then surface-hardened using an induction process. This creates a deep, ultra-hard wear layer to ensure a long service life for bearings and mating components.
After hardening, the shaft is finished to its final, precise dimensions.
CNC Turning & Milling: Shapes the complex features of the shaft with high accuracy.
Cylindrical Grinding: All bearing journals and critical diameters are precision ground to a smooth surface finish and tight tolerances. This is essential for proper bearing fit, reduced friction, and preventing premature wear.
Do you have a failed OEM shaft or need a reliable spare? We specialize in manufacturing replacement excavator shafts that meet or exceed original specifications.
From Sample Part: Send us your worn or broken shaft. We will perform a full metallurgical analysis and dimensional inspection to reverse-engineer and produce a superior replacement.
From Technical Drawing: We can manufacture directly from your OEM or custom drawings to your exact requirements.
Every eccentric shaft is rigorously inspected to guarantee its integrity before it leaves our facility.
100% Ultrasonic Testing (UT) on the raw forging to certify it is free of internal flaws.
Magnetic Particle Inspection (MPI) after machining to ensure there are no surface cracks.
CMM Dimensional Verification to confirm all diameters, eccentricities, and tolerances are perfect.
Hardness and Case Depth Testing to validate the heat treatment process.
Prevent Downtime. Get a Quote for a Forged Eccentric Shaft.
Contact our engineering team with your excavator model, part number, or technical drawing to get a quote for a shaft built to last.
