Optical Profilometry Replica Metrology Protocol for Mould Cavity Topography
Indirect optical profilometry on elastomeric cavity replicas yields sub-micron texture data while eliminating tool teardown and optical access limits.
Material Volume Vmp
Meaning
Functional volume measurements of the peaks on a surface quantify the amount of material above a specific core level. The material volume vmp is a three dimensional parameter that calculates the volume of the topographical features that would be worn away during initial contact. It provides a more detailed understanding of surface texture than simple roughness averages.
The calculation is based on the area under the bearing area curve between zero and ten percent material ratio.
Topographical Volume
Advanced metrology software integrates the height data across the measured field to determine the cubic volume of the peaks. A high material volume vmp indicates how much material is available to support a load. Surfaces with these values suggest a topography that will undergo measurable change during the run in period.
Wear Behavior
Rapid loss of surface height occurs when the peak structure is high relative to the core level. Moulders monitor the material volume vmp on textured tool surfaces to predict how long a grain will last before it begins to flatten. A low volume indicates a more stable surface that resists abrasive wear.
Tribological Analysis
Friction between the moulded part and the tool surface depends on the actual contact area. By measuring the material volume vmp, engineers can estimate the lubrication requirements or the force needed for part ejection. This parameter helps in selecting tool steels with appropriate hardness for the expected production volume.