Optical Profilometry Parameter Verification for Hardened Steel Tool Cavities
Verify hardened steel tool cavity topography using ISO 25178 areal parameters and filtered coherence scanning interferometry to guarantee polymer part release.
Vvv
Meaning
Functional valley void volume parameters measure the fluid retention capacity contained within the deepest ten percent of a surface height distribution. Moulding specialists monitor Vvv to evaluate fluid trapping and micro-particle containment in deep valley micro-structures on tool steel inserts. High valley void volume values allow surfaces to trap abrasive wear particles away from sliding contact zones.
Datasheet roughness metrics like Ra fail to quantify deep valley storage capability.
Valley Storage
Curve integration evaluates void space lying below the eighty percent material ratio line down to the lowest profile point. Deep valley micro-grooves act as storage reservoirs for heavy lubricants and functional surface coatings. Chemical etching and electrical discharge machining generate high valley void volumes on tool cavity walls.
Molten resin must fill these deep valleys completely to replicate fine textured finishes.
Wear Mitigation
Deep valley reservoirs retain protective lubricant films under severe mechanical clamping loads. Entrapping abrasive resin debris inside valley voids prevents surface scratching on moving core components. Regrind polymers containing metallic contaminants fill valley spaces, lowering effective void volume over extended production runs.
Mold cleaning restores valley void capacity to maintain smooth mechanical operation.
Metrological Verification
Optical surface profilers compute valley void volume from non-contact three-dimensional topography scans. Correct filtering separates deep surface valleys from structural part warpage and measurement noise. Mold maintenance guidelines establish baseline Vvv target ranges for critical sealing and sliding tool interfaces.
Standard ISO 25178 Parameters for Optical Profilometry Inspection
ISO 25178 areal optical profilometry replaces subjective 2D stylus traces with quantitative 3D parameters that accurately govern tool wear and part demoulding.