En metod för att producera en form för högtryckspressgjutning med minskad risk för grov sprickbildning

Patentradars sammanfattning

Uddeholm AB's patent describes a Hot Isostatic Pressing (HIP) route for manufacturing near-net-shape HPDC moulds with conformal cooling channels that practically eliminates gross cracking. The key novelty is embedding pre-shaped stainless steel tubes (Ra ≤ 3 µm) as the cooling channel liners within a steel container filled with 2–14 % Cr hot work tool steel powder before HIP consolidation, thereby providing a smooth, corrosion-resistant inner channel surface that prevents fatigue crack initiation—the root cause identified in AM-produced moulds. Two examples validate the approach: using Uddeholm DIEVAR® (5% Cr steel) and a maraging steel (Ac1 = 730 °C, 5.3% Cr, 5.5% Mo), both achieving 200,000 shots without gross cracking in Al-alloy HPDC.

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