Meaning
Thermal ablation uses high-intensity light to remove metal from a tool surface for creating textures, logos, or identification marks. Laser mold engraving functions by focusing a pulse beam to vaporize material without contact, which preserves the structural integrity of the steel surrounding the cavity. This non-mechanical method provides high precision for small geometries that manual tools cannot reach or accurately replicate.
Surface Integrity
Dimensional accuracy depends on the pulse frequency and the speed of the beam across the workpiece. Laser mold engraving maintains tolerances within microns when the operator calibrates the focal length to the specific alloy hardness. Tooling manufacturers use this method to achieve consistent finish depths across entire cavity sets.
Variations in pulse power cause surface irregularities, which eventually manifest as sticking or release failures during the injection cycle. Virgin resins flow differently against these micro-textures than regrind, making the depth of the mark a variable in cycle time and part ejection.
Production Influence
Tool makers define the depth of the texture to match the required gloss levels of the molded part. Laser mold engraving allows for the placement of deep-draw marks or fine cosmetic graining in areas where manual etching remains impossible. The process reduces manual labor hours by automating the removal of metal from complex three-dimensional contours.
Depth control prevents the local thinning of the tool wall, which protects against potential cracking during the thermal expansion of high-pressure injection.
Material Compatibility
Carbon content in the tool steel dictates the speed of ablation and the final clarity of the mark. Laser mold engraving reacts differently to stainless grades compared to hardened tool steels, because the metallic structure absorbs energy at distinct rates. Precise energy adjustment minimizes the heat-affected zone, preventing the brittle phase formation that reduces tool longevity.
Correct calibration prevents premature wear at the boundaries of the engraved region. Proper adjustment ensures the mark remains sharp throughout the operational life of the tool.
