Secondary Gas Loop Extraction Dynamics for Reducing Parasitic Accretion in Tool Steels
Secondary gas loops sweep metal condensate and ejecta out of laser paths, eliminating parasitic accretion and void formation in tool steels.
Tool Steel Additive Manufacturing
Meaning
Industrial 3D printing processes utilize laser powder bed fusion or directed energy deposition to create high-hardness components for manufacturing dies and molds. Tool steel additive manufacturing enables the fabrication of complex internal geometries such as conformal cooling channels in injection molds. It replaces traditional subtractive machining for complex geometries but requires post-process heat treatment.
Process Variable
High-power lasers melt tool steel powders in successive layers under an inert argon gas atmosphere to build the part. Achieving high density during tool steel additive manufacturing requires optimization of laser scan speed and hatch spacing. Build plate preheating reduces the thermal gradient to prevent cracking.
In-situ monitoring systems detect layer defects before the build completes. This feedback loop adjusts the laser output to correct temperature variations.
Commercial Benefit
Mold makers reduce cycle times in plastic injection molding by utilizing inserts with conformal cooling lines. Investing in tool steel additive manufacturing minimizes tool wear and extends production lifetimes. This technology reduces material waste compared to milling solid blocks.
It accelerates the development cycles for new tooling components.
Material Constraint
Elevated carbon content increases susceptibility to thermal stress cracking during solidification. Components made via tool steel additive manufacturing require stress-relief annealing to achieve the necessary toughness. Material hardness increases only after final quenching.