Matching Tool Steel Selection to Initial Production Commitments
Match tool steel hardness and chemistry directly to committed shot counts and resin abrasiveness to prevent premature cavity failure and tooling cost overruns.
Titanium Nitride
Meaning
A ceramic thin-film coating applied via physical vapor deposition imparts high surface hardness and low frictional resistance to metal tooling substrates. Application of titanium nitride onto injection mould core pins and slide components reduces abrasive wear from mineral-filled resins. The golden-colored layer measures between two and five micrometres in thickness while providing surface hardness exceeding two thousand Vickers.
Functional scope limits extend to surface wear and corrosion protection, offering no structural reinforcement to underlying tool steel against core bending forces.
Wear Resistance
Abrasive glass fibers in reinforced polymer compounds cause severe erosive wear on unprotected cavity steel. The dense ceramic matrix of the surface layer resists micro-scratching and delays tool geometry loss across extended production runs. Lower surface energy prevents resin adhesion, eliminating galling between sliding core components.
Deposition Temperature
Applying the coating requires vacuum chamber processing at temperatures around four hundred fifty degrees Celsius. Tool steels must be tempered above this processing temperature to prevent substrate softening during film deposition.
Release Efficiency
Coating core surfaces reduces ejection force requirements by lowering friction between the cooling plastic and tool steel. Improved surface release minimizes part distortion and prevents pin push-through defects on thin-wall parts. Smooth resin flow over coated gate inserts delays corrosive buildup from degrading off-gases.
Retaining pristine core geometry preserves part dimensional repeatability across millions of moulding cycles.