Quantifying Micro Structure Transfer Loss in Laser Textured Injection Tooling Cavities
Polymer micro-structure transfer loss in laser-textured tooling stems from melt freezing kinetics and trapped gas counter-pressure, requiring variotherm control.
Tool Steel 1.2344
Meaning
High-chromium hot-work steel grades provide the thermal shock resistance and toughness required for demanding injection moulding and extrusion tooling. This tool steel 1.2344 is a chromium-molybdenum-vanadium alloyed material characterized by its high temper resistance and dimensional stability during heat treatment. Cavities made from this alloy withstand the abrasive forces of glass-filled resins while maintaining a high surface finish across long production campaigns.
Its balanced property profile makes it a standard selection for both plastic moulding and die-casting inserts.
Alloy Performance
Vanadium carbides within the alloy matrix contribute to excellent wear resistance against flowing polymer melts. This steel retains its hardness and mechanical strength even when exposed to high processing temperatures during the moulding of engineering plastics. Resistance to thermal cracking ensures the cavity walls remain smooth and free of defect-inducing fissures.
Heat Treatment
Hardening and tempering cycles optimize the microstructure of the steel to achieve a balance of toughness and wear resistance. Double or triple tempering is performed to eliminate retained austenite and relieve internal stresses. Incorrect tempering results in low impact strength, making the tooling prone to cracking under high injection pressures.
Surface Treatment
Nitriding or physical vapor deposition coatings apply successfully to this steel grade to further enhance surface hardness. These treatments lower the friction coefficient of the cavity walls, which assists in part ejection and reduces cycle times. The process must be conducted below the tempering temperature of the steel to avoid softening the core.