3D Printed Tooling & Conformal Cooling Channel Design is an open-access pedagogical technical module curated by Dr. Jacob Gan for the Open Educational Resource (OER) engineering repository on Prep4Uni.online.
This module provides an advanced treatment of Design for Additive Manufacturing (DfAM) applied to high-volume injection moulding and die-casting tooling inserts fabricated via Laser Powder Bed Fusion (LPBF / DMLS) in 18Ni300 (1.2709) maraging tool steel. It addresses the fundamental thermal bottleneck of the polymer cooling cycle by contrasting conventional subtractive gun-drilled channels with freeform internal conformal cooling networks.
Core Technical & Mathematical Scope:
- Conjugate Heat Transfer: Multi-dimensional transient Fourier conduction within dense metallic tooling blocks coupled to internal turbulent fluid convection via Newton's Law of Cooling.
- Fluid Turbulence & Convective Coefficients: Dimensionless flow characterization via Reynolds number (Re) and convective heat transfer coefficient calculation using the Dittus-Boelter correlation (Nu = 0.023 · Re^0.8 · Pr^0.4).
- Hydraulic Loss Analysis: Darcy-Weisbach pressure drop formulations and implicit Colebrook-White friction factor evaluations accounting for elevated as-built LPBF channel surface roughness (Ra ~ 10–25 µm).
- DfAM Constraints: Overhang mitigation via self-supporting cross-sections (teardrop, diamond, and aspect-ratio-optimized elliptical conduits), wall-to-cavity thickness offsets, acoustic depowdering protocols, and precipitation age-hardening heat treatments.
Curriculum & Standards Alignment:Structured to satisfy graduate attribute competencies under the Washington Accord (WA1, WA2, WA3, WA5) and EUR-ACE frameworks for advanced undergraduate mechanical, manufacturing, and materials engineering curricula.
Permanent Web Placement:https://prep4uni.online/stem/physical-technologies/industrial-and-manufacturing-technologies/additive-manufacturing-3d-printing/3d-printed-dies-and-moulds/
