Statistical Wear Tracking Protocol Implementation for Hardened Shutoff Lands
Implement press-side optical profilometry and statistical Cpk limits to track hardened shutoff land recession, triggering precision refurbishment before resin flash occurs.
Archard Wear Equation
Meaning
Tribological formulas estimate the volume of material lost to sliding wear over a specified distance under a given normal load. The archard wear equation provides this calculation for sliding metal surfaces within the injection mould, such as ejector pins or slide cores. This relation assumes that wear volume remains proportional to the sliding distance and the applied load while remaining inversely proportional to the hardness of the softer material.
Mathematical Model
Calculations of material loss rely on a dimensionless wear coefficient that is characteristic of the specific material contact and lubrication state. The equation relates the wear volume to the sliding distance, normal force, and hardness. It assists molders in estimating the operational life of sliding tooling components before refurbishment is required.
Tooling Application
Tooling steels of high hardness resist abrasive wear caused by glass fibers or carbon fillers in the melt. The archard wear equation helps determine the necessary hardness difference between sliding mold plates to prevent premature degradation. Tool designers use these calculations to select coatings or lubricants that lower the wear coefficient and extend production cycles.
Wear Mitigation
Wear rates can be lowered by choosing materials with higher surface hardness or by applying hard thin-film coatings to the core. This formula guides the selection of surface treatments such as nitriding to decrease material loss on moving cores. When processing filled polymers, optimizing these properties protects critical shutoffs from erosive wear.