Influence of sliding velocity and applied load on the tribological properties of ultra-high molecular weight polyethylene.
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Abstract
The CNC milling process for surface finishing has been widely used in manufacturing of machine components for the food processing industry due to its high efficiency, low cost, and ability to accurately produce complex geometries with high dimensional accuracy. This research investigates the effects of sliding velocity and applied load on the tribological properties of ultra-high-molecular-weight polyethylene (UHMWPE), grade U511. The UHMWPE specimens were fabricated by compression molding, followed by surface finishing using CNC milling. Wear tests were conducted using a block-on-ring configuration under dry conditions, with controlled sliding velocities and normal loads. The specimens’ temperature of the coefficient of friction (COF), and wear rate were measured. The results showed that both the COF and wear rate increased with increasing applied load. The COF ranged from 0.010 to 0.058, while the wear rate ranged from 3.615 × 10-10 to 9.156 × 10-10 mm³/Nm. Increasing sliding speed and load promoted frictional heating, raising the surface temperature from 25°C to a maximum of 55°C after 2000 m of sliding. The elevated temperature induced thermal softening of the material and promoted adhesive wear. In addition, rougher surface conditions contributed to higher initial wear; however, the formation of a transfer layer tended to stabilize the wear behavior over time.
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